CARGO CONTAINER

The cargo container comprises a cargo container comprising: a rectangular bottom platform; a side panel pair and a front and right panel pair disposed in a vertical direction on the four sides of the bottom platform; corner posts disposed in a vertical direction on corner portions of the bottom platform for connecting the side edge parts of the side surface panel to one of the side edge portions of the front or rear panels; corner connecting members disposed on the upper ends and lower ends of the corner posts; and a top side panel disposed for being connected with the upper edge portions of the side surface panels and the front and rear panels; wherein the corner posts is, on a view of the cross section thereof, of a substantially Ω-shaped form.

TECHNICAL FIELD

The present invention relates to a container for cargo for marine transportation and land transportation of loaded cargo.

The present application claims priority based on Japanese Patent Application No. 2009-210180 filed on September 11, 2009, the contents of which are incorporated herein by reference.

BACKGROUND ART

The cargo container for transporting the cargo is mainly made of a metallic member such as steel, stainless steel, or aluminum, and is formed of a box body in the shape of a rectangular parallelepiped. In addition, the cargo container is loaded with cargo and transported through a transportation means such as a ship, truck, railroad or the like. Especially in recent years, from the viewpoint of efficient global logistics not only in Japan but also around the world, the load carrying performance of the cargo container, the overall dimensions, and the shape of the connection portion with the transport equipment are based on international standards such as ISO It is almost universal in the world. By standardizing the freight container under a certain rule to achieve commonality, compatibility and convenience in transportation are ensured.

In recent years, however, from the viewpoint of protecting the global environment, the movement of reducing the emission of greenhouse effect gases is also increasing in the field of logistics, and lightening of the means of transportation such as ships, trucks and railways carrying cargo is progressing. Since the cargo containers are transported by these transport means, the weight of the containers themselves is reduced, which leads to a reduction in weight of the entire cargo including the transport means, and is more preferable in order to protect the global environment. Under such a background, the demand for lighter weight is also increasing in cargo containers. However, in this case, it is necessary to achieve weight reduction while securing the load-carrying performance specified in ISO.

The cargo container may be in the form of a rectangular bottom pallet, a pair of side panels mounted on four sides of the bottom pallet, a pair of front and rear panels, and a corner fitting provided at an upper end portion and a lower end portion of the corner posts, and a corner fitting provided at the upper end portion of the front and rear panels so as to be connected to the side panels and the front and rear panels upper edge portions Cargo containers with a ceiling panel are common. In such a cargo container, the cross-sectional shape of the corner post is adjusted to the cross-sectional shape of the corner fitting as much as possible, and the cross-sectional area of the corner post is made large, whereby the member strength against compressive load when the cargo containers are stacked together and is designed to satisfy the required performance for single loading.

Japanese Patent Application Publication No. 2005-536413

Technical problems

However, according to the conventional container for cargo, the cross-sectional area of the corner post must be increased, so that the weight is increased accordingly. That is, in order to improve the member resistance against the compression load, it is necessary to increase the cross-sectional area of the corner post. However, there is a problem in that the weight increases and the weight cannot be reduced.

SUMMARY

An object of the present invention is to provide a cargo container capable of securing a member strength and improving the performance of a single piece while reducing the weight of the entire corner post, and further, the cargo container.

(1) A cargo container according to one aspect of the present invention comprises: a rectangular bottom pallet; a pair of side panels mounted on four sides of the bottom pallet; a pair of front and rear panels; A corner fitting provided at an upper end portion and a lower end portion of the corner posts, the corner fittings being provided on the side panels and the side panels; and a plurality of corner posts provided between the side panels and the side edges of the front and rear panels, a first connecting portion connected to a side edge portion of the side panel in a case where the corner post is viewed as a flat section, and a second connecting portion connected to a side edge portion of the front and rear panels, A second connecting portion continuous to the first connecting portion and projecting in an outward direction intersecting the surface direction of the side panel; a second projected surface portion continuing to the second connection portion and projecting in an outward direction intersecting the surface direction of the front and rear panels; and a second projected surface portion provided directly or indirectly to the first projected surface portion, a first side surface portion extending in the surface direction of the side panel, a second side surface portion directly or indirectly installed on the second projecting surface portion and extending in the surface direction of the front and rear panels, and a second side surface portion extending in the first side surface portion and the second side surface portion Wherein the first connecting portion and the first protruding surface portion have a width dimension in the vertical direction with respect to the second side surface portion from the first corner portion to the second side surface portion, Of the width dimension in the vertical direction with respect to the first side surface portion from the second corner portion to the first side surface portion in which the second connecting portion and the second projecting surface portion are continuous, wherein a relationship between a thickness b of the corner post and a material yield strength F of the corner post satisfies b0>740t/(√F) The relationship between the minimum width dimension (b), the thickness (t) of the corner post and the material yield strength (F) of the corner post among the width dimensions of the side portions satisfies b<=740t/(√F).

(2) According to the cargo container described in (1) above, the end corner portion is provided with inclined side surfaces which are continuous to intersect both the first side surface portion and the second side surface portion, and the inclined side surface portion, (B), the thickness t of the corner post, and the material yield strength (F) of the corner post among the width dimensions of the side surface portion and the second side surface portion satisfy b<=740t/(√F).

(3) According to the cargo container described in (2), it is preferable that a chamfered portion is formed at the corner portion of the corner fitting along the shape of the inclined side surface portion.

(4) According to the cargo container described in (1) above, the tip end corner portion is provided with an end concave curved surface portion formed by a convex convex surface facing outward, or a concave curved surface portion formed by a concave curved surface facing inward .

(5) According to the cargo container described in (4), it is preferable that a chamfer portion is formed at the corner portion of the corner fitting along the shape of the curved front end portion or the curved front end portion.

(6) According to the cargo container described in any one of the above items (1) to (5), the third corner portion in which the first projecting surface portion and the first side surface portion are continuous and the second projecting surface portion and the second side surface portion A convex beveled portion chamfered by a convexly curved surface facing the outside of the corner portion, and a convex beveled portion formed by chamfering the corner portion with an inclined surface, It is preferable that any one of the concave chamfer portions chamfered in the chamfered portion is formed.

(7) According to the container for cargo described in (6), it is preferable that a chamfer portion is formed at the corner portion of the corner fitting along the shape of the inclined chamfer portion, the convex chamfer portion or the concave chamfer portion Do.

(8) According to the cargo container described in (1) above, the first projecting surface portion is an inclined first projecting surface portion projecting obliquely outward from the first connecting portion toward the front end portion, and the second projecting surface portion And an inclined second protruding surface portion projecting obliquely toward the outside or the front end from the second connecting portion.

(9) According to the cargo container described in (8), it is preferable that a chamfer portion is formed at the corner portion of the corner fitting along the shape of the inclined first projecting portion and the inclined second projecting portion.

(10) According to the cargo container described in (1) above, the first side surface portion and the second side surface portion are provided with a concave curved surface facing inward from each intermediate position or an intermediate curved portion formed from a refracting surface facing inward desirable.

According to the cargo container described in (1) above, the material strength of the corner post is made stronger and the thickness of the corner post is made thinner so that the width dimension b0 of the corner post becomes larger than 740t /((√ F) The buckling of the plate element can be suppressed by setting the width dimension b of each surface portion to 740 t / (√ F) or less so that the sectional area can be made small while securing the member strength against the compressive load can do. As a result, it is possible to reduce the weight of the corner post itself. be = 740t / (√ F) is an expression representing the effective width be of the plate element subjected to the in-plane compressive force. If b? b, no void portion accompanying the local buckling occurs in the plate element with respect to the compressive force, The effective rate is not lowered, and the weight can be efficiently reduced.

By thinning the thickness of the corner post, it is possible to reduce the weight of the corner post itself, which leads to a reduction in the weight of the entire container for the cargo, the emission amount of the greenhouse effect gas, and furthermore, So that a suitable configuration can be achieved. Further, by reducing the cross-sectional area of the corner post, it contributes to the reduction of the material cost and also the surface area is reduced, thereby contributing to the reduction of the cost of coating.

However, when the cross-sectional area of the corner post is made small, it is possible to consider reducing the width dimension b0 while keeping the thickness of the corner post constant. However, if the width dimension b0 of the corner post itself is made small, And the fitting of the corner fittings, the side surfaces, and the front and rear panels of the corner fitting are changed, or the outside size of the international standard is deviated from the external size, thereby causing problems such as compatibility and convenience in transportation being impaired.

On the other hand, when the thickness of the corner post is made smaller as the means for reducing the cross-sectional area without significantly changing the contour of the corner post itself, the thickness t is smaller than the width dimension b of each surface portion of the corner post. That is, the width-to-thickness ratio (b / t) becomes large. As a result, there arises a problem that the problem of local buckling occurs and the performance against the compressive load at the time of unloading cannot be satisfied.

Therefore, the relationship between the minimum width dimension (b), the thickness (t) of the corner post and the material yield strength (F) of the width dimension of the first side surface portion and the second side surface portion in the corner post are set so as to satisfy the relationship of the following expression b<=740t(√F) (hereinafter referred to as Equation 1). Thereby, local buckling can be prevented, and the required performance against the compression load at the time of unloading can be satisfied.

According to the cargo container of the above (2), by providing the inclined side surface portions intersecting at both the first side surface portion and the second side surface portion at the corner portion at the tip end, the cargo container described in the above (1) The width dimension (b) of the first side surface portion and the second side surface portion can be made smaller than that of the container. As a result, the width-to-thickness ratio (b / t) of the first side surface portion and the second side surface portion can be reduced. By setting the thickness (t) of the corner post and the width dimension (b) of each surface portion so as to satisfy the relationship of the expression (1), the local buckling can be prevented, the required performance against the load can be ensured.

According to the cargo container described in (3) above, since the chamfered portion is formed in the corner fitting, the sectional area of the corner post is reduced. Thereby, the corner fitting itself can be reduced in weight, and the weight of the entire container for freight can be promoted.

According to the cargo container described in (4) above, the width b of the first side surface portion and the second side surface portion can be reduced by providing the tip end convex curved surface portion or the tip end concave curved surface portion at the tip end corner portion. As a result, it is possible to suppress an increase in the width-to-thickness ratio (b / t) of the first side surface portion and the second side surface portion, to prevent local buckling, and to secure the required performance against the compression load of the entire corner post.

According to the cargo container of (5), since the chamfered portion is formed in the corner fitting, the cross-sectional area of the corner fitting is reduced. Thereby, the corner fitting itself can be reduced in weight, and the weight of the entire container for freight can be promoted.

According to the cargo container of (6), by providing the inclined surface motive base portion, the convex chamfered portion, and the concave chamfered portion at the third corner portion or the fourth corner portion which are the corner portions other than the corner portions at the front end, The width dimension (b) of the second side surface portion can be reduced. As a result, the width-to-thickness ratio (b / t) of the first side surface portion and the second side surface portion can be further suppressed. Here, it is a matter of course that the relationship between the thickness and the width dimension of the surface portion and the material yield strength of the sloped chamfer satisfies the above-mentioned expression (1).

According to the cargo container of (7), since the chamfered portion is formed in the corner fitting, the sectional area of the corner fitting is reduced. Thereby, the corner fitting itself can be reduced in weight, and the weight of the entire container for freight can be promoted.

According to the cargo container of (8), the first projecting surface portion and the second projecting surface portion are made into the inclined first projecting surface portion and the inclined second projecting surface portion, respectively, so that the inclination of the first side surface portion and the second side surface portion. The width dimension (b) can be reduced. This also makes it possible to reduce the width-to-thickness ratio b / t of the first side surface portion and the second side surface portion. Also in this case, the relationship between the thickness t and the width dimension b of the oblique first projecting surface portion and the oblique second projecting surface portion and the material yield strength F satisfies the above-mentioned expression (1).

According to the cargo container described in (9) above, since the chamfered portion is formed in the corner fitting, the sectional area of the corner fitting is reduced. Thereby, the corner fitting itself can be reduced in weight, and the weight of the entire container for freight can be promoted.

According to the cargo container of (10), the width dimension b of each of the divided side surfaces can be reduced by dividing the first side surface portion and the second side surface portion by the intermediate bend portion. As a result, the width-to-thickness ratio (b / t) of the first side surface portion and the second side surface portion is also reduced, so that the local buckling strength can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a perspective view of a cargo container according to an embodiment of the present invention.

Fig. 2 is an enlarged cross-sectional view of a corner post and a corner fitting of a cargo container according to an embodiment of the present invention.

Fig. 3 is an enlarged cross-sectional view showing a modified example of the corner post.

Fig. 4 is an enlarged cross-sectional view showing another modified example of the corner post.

Fig. 5 is an enlarged cross-sectional view showing another modified example of the corner post.

Fig. 6 is an enlarged cross-sectional view showing another modified example of the corner post.

Fig. 7 is an enlarged cross-sectional view showing another modified example of the corner post.

Fig. 8 is an enlarged cross-sectional view showing another modified example of the corner post.

Fig. 9 is an enlarged cross-sectional view showing a modified example of the corner fitting.

Fig. 10 is an enlarged cross-sectional view showing a conventional corner post.

Fig. 11 is a diagram showing the FEM analysis result according to the embodiment of the present invention.

Fig. 12 is a diagram showing the results of FEM analysis according to a comparative example of the present invention.

Fig. 13 is a graph showing a load-deformation relationship of the analysis results in the above embodiment and the comparative example.

DETAILED DESCRIPTION

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

As shown in Fig. 1, the cargo container 1 to which the present invention is applied is constituted by a box body, and it is possible to load cargo. The cargo container 1 is made of metal such as steel, stainless steel or aluminum. Since the cargo container 1 is supposed to be transported through a transportation means such as a ship, truck, railroad or the like, it is preferable to use a cargo container such as ISO It is based on specifications.

The cargo container 1 has a rectangular bottom pallet (not shown), a pair of side panels 2 standing on four sides of the bottom pallet, a pair of front and rear panels 3, A plurality of corner posts 4 which are vertically installed and connect between a side edge portion of the side panel 2 and a side edge portion of the front and rear panel 3 and a corner post 4 provided at the upper and lower ends of the corner post 4, And a ceiling panel 6 connected to the upper edges of the side panels 2 and the front and rear panels 3.

The side panels 2 and the front and rear panels 3 are each provided on the bottom pallet and the adjacent panels 2 and 3 are connected to each other through the corner posts 4. The adjacent side panels 2 and the front and rear panels 3 are substantially perpendicular to each other. The side panel 2, the front and rear panels 3 and the ceiling panel 6 are made of a corrugated steel sheet made of a relatively thin steel sheet having a thickness of about 1 mm to 2 mm, for example. An opening and closing door (not shown) is provided on one of the side surface, the front and rear surface, and the ceiling surface of the cargo container 1, and the cargo is loaded in the container. For example, when the opening and closing door is provided on either of the front and rear surfaces, the corner post adjacent to the door may be formed of a groove-shaped steel or the like having a shape different from that of the corner post 4 of the present embodiment. In such a case, only one of the front and rear surfaces may be applied to the corner post 4 described later. That is, the corner posts 4 described later may be applied not only to all four corners of the container, but also to any of the four corners.

Next, the configuration of the corner post 4 applied to the cargo container 1 to which the present embodiment is applied will be described with reference to Figs. 2 to 8. Here, FIG. 2 is a sectional view showing the corner post 4 in the representative form, and FIGS. 3 to 8 are sectional views showing the corner post 4 according to the modified example.

Figs. 2 to 8, the corner post 4 is made of a weather-resistant steel, for example, by bending a steel sheet having a thickness t of about 3 mm to 5 mm. A steel material having a material yield strength (F) of about 550 MPa to 700 MPa is used for the steel plate.

A first connecting portion 41 connected to the side edge portion of the side panel 2 and a second connecting portion 41 connected to the side edge portion of the front and rear panel 3, And a second protruding portion 43 which is continuous with the first connecting portion 41 and protrudes outward (in the X direction leftward in the figure) crossing the surface direction of the side panel 2, A second protruding surface portion 44 which continues to the second connecting portion 42 and protrudes outward (downward in the Y direction) crossing the surface direction of the front and rear panel 3, The first and second side surfaces 45 and 45 are provided directly on the first projecting surface portion 43 and extend in the surface direction of the side panel 2 and the first side surface portion 45 directly provided on the second projecting surface portion 44, A second side surface portion 46 extending in the planar direction and a tip corner portion 40 provided continuously to the first side surface portion 45 and the second side surface portion 46. [

Concretely, the first connecting portion 41 is connected to the side panel 2 in parallel with the surface direction of the side panel 2 (Y direction: longitudinal direction of the cargo container 1) . The second connecting portion 42 is connected to the front and rear panels 3 in parallel with the plane direction of the front and rear panels 3 (X direction: width direction of the container 1).

In this embodiment, the inclined side surface portions 47 are formed in the end corner portion 40 so as to intersect both the first side surface portion 45 and the second side surface portion 46 in a crossing manner. The inclined side surface portion 47 is formed by chamfering the end corner portion 40 (the lower side and the left side in FIG. 2).

The first connecting portion 41 is welded to the rim of the side panel 2 and the second connecting portion 42 is welded to the edge of the front and rear panels 3. The upper and lower end edges of the first projecting surface portion 43, the second projecting surface portion 44, the first side surface portion 45, the second side surface portion 46 and the inclined side surface portion 47 are welded to the upper and lower corner fittings 5, do. The corner fittings 5 of the upper and lower cargo containers 1 are brought into contact with each other when the cargo container 1 is vertically stacked on the corner posts 4. [ As a result, the load of the cargo container 1 loaded thereon is transferred to the corner posts 4 of the cargo container 1 on the lower side via the respective corner fittings 5. In the corner fitting 5, a lateral hole is provided from the side surface of the box-like base made of cast material, and an upper hole (or a lower hole from the lower surface) is provided from the upper surface. These hitch holes and upper holes (or lower holes) can be equipped with mounting devices for hanging up and carrying by a crane, respectively. Further, in the cargo container 1 loaded above, the contact surfaces of the corner fittings 5 are in contact with each other.

Next, the width dimension bx0 of the corner post 4 in the X direction is set such that the second connecting portion 42 and the second projecting surface portion 44 are continuous with each other as the width dimension b0 of the corner post 4 Is a width dimension in the vertical direction with respect to the first side surface portion 45 from the second corner portion 40D to the first side surface portion 45. [ In other words, the dimension excluding the second connecting portion 42, that is, the distance between the second corner portion 40D and the first side surface portion 45 in which the second connecting portion 42 and the second projecting surface portion 44 are continuous is set .

The width dimension in the Y direction by0 is the width of the second side surface portion 46 from the first corner portion 40C to the second side surface portion 46 in which the first connection portion 41 and the first projecting surface portion 43 are continuous in the vertical direction. In other words, the dimension excluding the first connecting portion 41, that is, the distance between the first corner portion 40C and the second side surface portion 46 in which the first connecting portion 41 and the first projecting surface portion 43 are continuous is set. That is, the width dimension (bx0, by0) is the dimension of the portion joined to the corner fitting 5, respectively. Hereinafter, the width dimension is called the fitting portion width dimension. The fitting portion width dimension (bx0, by0) is defined by the dimension of the corner fitting 5 based on the international standard, and is represented by, for example, the center thickness of the plate thickness. The fitting portion width dimension (bx0) is about 149 mm, and the fitting portion width dimension (by0) is about 168 mm.

The width dimension by1 of the first side surface portion 45 is a dimension obtained by subtracting the width dimension (by2) of the projected portion of the oblique side surface portion 47 from the fitting portion width dimension by0. The width dimension bx1 of the second side face portion 46 is a dimension obtained by subtracting the width dimension bx2 of the projected portion of the oblique side face portion 47 from the fitting portion width dimension bx0.

When the material yield strength F is 700 MPa and the thickness t of the corner post 4 is 3.6 mm as an example of the setting of the respective width dimensions bx0 and by0, The dimension bx0 of the fitting portion is about 149 mm and the fitting portion width dimension by0 of the Y direction is about 168 mm and the fitting portion width dimension b0 (bx0, by0) satisfies the following expression (0) do.

The width dimension by1 of the first side portion 45 is 100 mm and the width dimension by2 of the projected portion of the oblique side portion 47 is 68 mm and the width dimension of the second side portion 46 bx1 is 100 mm and the width dimension bx2 of the projected portion of the oblique side face portion 47 is set to 49 mm. Therefore, the width dimension (bxy) of the inclined side face portion 47 is set to about 83.8 mm. The maximum width dimension b of the width dimension b (bx1, by1, bxy) of the face portion, the thickness t of the corner post 4 and the material yield strength F of the corner post 4 The relationship satisfies the following expression (1).

Therefore, when the material yield strength F is 700 MPa and the thickness t is 3.6 mm, the width dimension b (bx1, by1, bxy) should be 100.7 mm or less which is the calculated value of the right side of the equation . The width dimension bx1 of the first side surface portion 45 and the width dimension bxy of the second side surface portion 46 and the width side dimension 47 of the inclined side surface portion 47 are all 100.7 mm or less, Equation 1 is satisfied.

As shown in Fig. 3, the corner post 4A has a first connecting portion 41, a second connecting portion 42, a first projecting portion 43, and a second connecting portion 41 which are almost the same as the corner post 4 described above. The cross section of the corner post 4A is provided substantially in an Ω shape, wherein the inclined surface chamfered portion 48, which is inclined and chamfered with respect to the first projecting surface portion 43 and the first projecting portion 45, is provided on a third corner portion 40A, at which the which the first projecting surface portion 43 and the first side surface portion 45 are continuous. In other words, the first projecting portion 45 is indirectly provided on the first projecting surface 43.

The fourth corner portion 40B in which the second projecting surface portion 44 and the second side surface portion 46 are continuous is provided with an inclined surface chamfered portion inclined and chamfered with respect to the second projecting surface portion 44 and the second side surface portion 46, (49) are formed. That is, the second side surface portion 46 is indirectly provided on the second projecting surface portion 44. In this corner post 4A, the width dimension (bxyA) of the inclined side face portion 47 becomes smaller than the corner post 4 shown in Fig. The width dimension by1A of the first side surface portion 45 is smaller than the width dimension by1 of the first side surface portion 45 shown in Fig. 2 by forming the inclined chamfer portion 48. The width dimension bx1A of the second side face portion 46 is smaller than the width dimension bx1 of the second side face portion 46 shown in Fig. 2 by forming the inclined chamfer portion 49. That is, also in the corner post 4A, the width dimension by1A of the first side face portion 45, the width dimension bx1A of the second side face portion 46, and the width dimension bxyA of the oblique side face portion 47 are all mathematical Equation 1 is satisfied.

As shown in Fig. 4, the corner post 4B has a first connecting portion 41, a second connecting portion 42, a first projecting portion 43, and a second connecting portion 41 which are substantially the same as the corner post 4 described above. 2 protruding surface portion 44, a first side surface portion 45 and a second side surface portion 46 and has a substantially Ω-shaped flat section. A convex curved surface portion 50 is formed in the end corner portion 40 in place of the inclined side surface portion 47. The convex curved surface portion 50 is formed in the third corner portion 40A, and a fourth corner portion 40B is formed with a convex beveled portion 52 chamfered by an outwardly convex curved surface. That is, the first side surface portion 45 is indirectly provided on the first projecting surface portion 43, and the second side surface portion 46 is indirectly provided on the second projecting surface portion 44.

In this corner post 4B, since the end convex curved surface portion 50 and the convex chamfered portions 51, 52 are formed, the width dimension by1B of the first side surface portion 45 is larger than the width dimension ” And the width dimension bx1B of the second side face portion 46 is smaller than the width dimension bx1 of the second side face portion 46 shown in Fig. That is, also in the corner post 4B, the width dimension by1B of the first side face portion 45 and the width dimension bx1B of the second side face portion 46 all satisfy the expression (1).

As shown in Fig. 5, the corner post 4C includes a first connecting portion 41, a second connecting portion 42, a first projecting surface portion 43, and a second connecting portion 43 which are substantially the same as the corner post 4 described above. 2 protruding surface portion 44, a first side surface portion 45 and a second side surface portion 46, and the flat section has a substantially Ω shape. The leading end concave curved surface portion 53 is formed in the end corner portion 40 in the form of a curved surface concaved inwardly and the third corner portion 40A is formed in place of the inclined side surface portion 47 and the tip end convex curved surface portion 50, And a concave chamfered portion 55 chamfered by a curved surface inwardly concaved in the fourth corner portion 40B is formed. That is, the first side surface portion 45 is indirectly provided on the first projecting surface portion 43, and the second side surface portion 46 is indirectly provided on the second projecting surface portion 44.

In this corner post 4C, since the leading end concave curved surface portion 53 and the concave chamfered portions 54 and 55 are formed, the width dimension by1C of the first side surface portion 45 is smaller than the width dimension by1C shown in FIG. Is smaller than the width dimension b1 of the first side surface portion 45 and the width dimension bx1C of the second side surface portion 46 is smaller than the width dimension bx1 of the second side surface portion 46 shown in Fig. That is, also in the corner post 4C, the width dimension by1C of the first side face portion 45 and the width dimension bx1C of the second side face portion 46 all satisfy the expression (1).

As shown in Fig. 6, the corner post 4D has a first connecting portion 41, a second connecting portion 42, a first protruding surface portion 43, and a second connecting portion 42 which are almost the same as the corner posts 4 described above. 2 protruding surface portion 44, a first side surface portion 45, a second side surface portion 46, and a slant side surface portion 47, and a flat section is almost Ω-shaped. The convex chamfered portion 51 is formed in the third corner portion 40A and the convex chamfered portion 52 is formed in the fourth corner portion 40B. That is, the first side surface portion 45 is indirectly provided on the first projecting surface portion 43, and the second side surface portion 46 is indirectly provided on the second projecting surface portion 44.

The width dimension by1D of the first side face portion 45, the width dimension bx1D of the second side face portion 46 and the width dimension bxyD of the oblique side face portion 47 are all expressed by the following equations 1.

As shown in Fig.7, the corner post 4E includes a first connecting portion 41, a second connecting portion 42, a first projecting portion 43, and a second connecting portion 41 which are substantially the same as the above-described corner post 4, A first side surface portion 45, a second side surface portion 46 and an inclined side surface portion 47, and the flat section has a substantially Ω shape. The first projecting surface portion 43 becomes the inclined first projecting surface portion 43A which is inclined from the first connecting portion 41 toward the outer end corner portion 40 and protrudes. That is, in the corner post 4 shown in Fig. 2, the angle formed between the first projecting surface portion 43 and the first side surface portion 45 is almost 90 degrees. In the corner post 4E shown in Fig. 7, the angle 1 formed by the first projecting surface portion 43A and the first side surface portion 45 exceeds 90 degrees. The second projecting surface portion 44 is an inclined second projecting surface portion 44A which is inclined from the second connecting portion 42 toward the outer end corner portion 40 and protrudes. That is, in the corner post 4 shown in Fig. 2, the angle formed by the second projecting surface portion 44 and the second side surface portion 46 is almost 90 degrees. In the corner post 4E shown in Fig. 7, 2 angle formed between the second projecting surface portion 44A and the second side surface portion 46 exceeds 90 degrees. In this corner post 4E, since the inclined side surface portion 47, the inclined first projecting surface portion 43A, and the inclined second projecting surface portion 44A are formed, the width dimension by1E of the first side surface portion 45 is And the width dimension bx1E of the second side face portion 46 is smaller than the width dimension bx1 of the second side face portion 46 shown in Fig. . That is, also in the corner post 4E, the width dimension by1E of the first side face portion 45, the width dimension bx1E of the second side face portion 46, and the width dimension bxyE of the oblique side face portion 47 are all mathematical Equation 1 is satisfied. The width dimension bx3 of the inclined first projecting surface portion 43A and the width dimension by3 of the inclined second projecting surface portion 44A also satisfy the expression (1).

As shown in Fig. 8, the corner post 4F includes a first connecting portion 41, a second connecting portion 42, a first projecting surface portion 43, and a second connecting portion 43 which are substantially the same as the corner post 4 described above. A second projecting surface portion 44, a first side surface portion 45 and a second side surface portion 46, and the flat section has a substantially Ω shape. The inclined side surface portion 47 is omitted and an intermediate bent portion 56 bent inward is formed at an intermediate position of the first side surface portion 45. In the intermediate position of the second side surface portion 46, A bent portion 57 is formed. In this corner post 4F, by forming the intermediate bent portions 56 and 57, the width dimension (by 4F) and the width dimension (by 5F) of the divided first side face portions 45A obtained by dividing the first side face portions 45 into two, Is smaller than the width dimension by1 of the first side face portion 45 shown in Fig. 2 and the width dimension bx4F and the width dimension bx4F of the divided second side face portion 46A obtained by dividing the second side face portion 46 into two, bx5F is smaller than the width dimension bx1 of the second side surface portion 46 shown in Fig. That is, also in the corner post 4F, the width dimensions (by4F, by5F) and the width dimensions (bx4F, bx5F) of the divided first side surface portion 45A and the divided second side surface portion 46A all satisfy the expression (1).

Next, a modified example of the corner fitting in the cargo container 1 to which the present invention is applied will be described with reference to Fig. 9. Here, FIG. 9 shows a corner fitting 5A according to a modified example when the corner post 4A is employed.

Chamfered portions 5B are formed at three corner portions on the outside of the corner fitting 5A along the shape of the inclined side surface portion 47 formed in the corner portion 40 at the corner post 4A, A chamfered portion 5C is formed along the shape of the inclined chamfer portion 48 formed in the corner portion 40A and the chamfered portion 5D is formed along the shape of the inclined chamfered portion 49 formed in the fourth corner portion 40B. Is formed. By forming the chamfered portions 5B, 5C and 5D corresponding to the shape of the corner post 4A in the corner fitting 5A as described above, the corner fitting 5A itself can be lightened, The weight of the whole can be promoted.

Here, the configuration in which the chamfered portion is formed in the corner fitting 5A using the corner post 4A shown in Fig. 3 is shown. However, the chamfered portion may be formed in the corner fitting 5 shown in Figs. It is possible.

Examples

Hereinafter, the results of examining the member strength of the corner post with respect to the cargo container 1 to which the present invention is applied will be described.

Here, the cargo container 1 to which the present invention is applied is taken as an example, and a cargo container having a conventional type of corner post is used as a comparative example, and the FEM analysis of each container is performed to calculate the member posture of the corner post did. In the FEM analysis model, each container is divided into four planes to set symmetry conditions at boundary portions, and a model capable of considering local buckling is used for elements of each member including corner posts. The analytical conditions are as follows. The test load conditions of Test No. 1 (Stacking) in ISO1496-1 are used as a reference, a vertical load is applied to the corner fitting from the top container, This vertical load was gradually increased. The vertical displacement of each load stress and load point until local buckling occurred was investigated.

[Implementation examples]

The embodiment uses the corner post 4 shown in Fig. The material yield strength F of the corner post 4 is 700 MPa and the thickness t of the corner post 4 is 3.6 mm. The width dimension (by0) of the fitting portion in the Y direction is 168 mm and the width dimension by1 of the first side surface portion 45 is 180 mm. The width dimension bx1 of the second side face portion 46 is 100 mm (the width dimension bx2 is 49 mm).

[Comparative Example]

In the comparative example, the same members as those in the embodiment were used except for the corner post 400 shown in Fig. The material yield strength F of the corner post 400 of the comparative example is 700 MPa and the thickness t of the corner post 400 is 3.6 mm. The corner post 400 includes a first connecting portion 410, a second connecting portion 420, a first projecting portion 430, a second projecting portion 440, a first side portion 450, (460), and the flat section has a substantially O-shape. The corner post 400 is different from the corner post 4 of the embodiment in that the inclined side surface portion 47 is not formed. The width dimensions (bx0, by0) of the fitting portions in the X direction and the Y direction of the corner post 400 are 149 mm and 168 mm, respectively. The width dimension of the first side face portion 450 is 168 mm and the width dimension of the second side face portion 460 is 149 mm since the width dimension of the fitting portion and the width dimension of the face portion are equal in each direction.

Fig. 11 shows the miscellaneous stress contour and deformation diagram of the analysis result of the embodiment, and Fig. 12 shows the miscellaneous stress contour diagram and deformation diagram of the analysis result of the comparative example. Fig. 13 shows a graph of the load-deformation relationship of the embodiment and the comparative example.

In the corner post 4 of the embodiment, as shown in Fig. 11, local buckling is not observed at the first side surface portion 45 and the inclined side surface portion 47, and a predetermined required proof load ISO, The strength is stable and the strength is increased.

On the other hand, in the corner post 400 of the comparative example, local buckling occurs in the first side portion 450 and the second side portion 460, as shown in Fig. As a result, as shown in Fig. 13, the rigidity indicated by the slope of the load-deformation relationship remarkably decreases before reaching the predetermined required load, and the load is suddenly dropped immediately thereafter.

Next, the degree of change of the width dimension of each surface portion according to the shape change of the inclined side surface portion of the corner post 4 shown in Fig. 2 and the effective ratio ρ (effective width be) (= 740 t / (√F) of the second side face portion 46 is shown in Table 1. By increasing the width dimension (bx2 and by2) of the projected portion of the inclined side face portion 47, the width of the second side face portion 46 The dimension bx1 and the width dimension by1 of the first side surface portion 45 can be suppressed to be smaller than the effective width be but if the bx2 and by2 are made too large, the width dimension bxy of the oblique side face portion 47 becomes be, and it can be seen that the effective rate is lowered.

That is, the relationship between the thickness t of the corner post, the width dimension b of the surface portion, and the material yield strength F of the corner post at least at the surface portion having the largest width dimension while considering the width dimension of each surface portion The width (b), the thickness (t), and the material yield strength (F) of the surface portion are set so as to satisfy the relationship of b<=740(√F) This makes it possible to reduce the cross sectional area while ensuring the member strength with respect to the compression load, thereby making it possible to reduce the weight of the corner post itself and to improve the proof stress.

Table 1

 

The present invention is not limited to the above-described embodiment, but includes other configurations and the like capable of achieving the object of the present invention, and modifications and the like shown below are also included in the present invention.

For example, in the above embodiment, the material yield strength F of the steel material used for the corner posts is 700 MPa. However, the material yield strength F is not limited to 700 MPa. The material yield strength F is not limited to the standard strength but may be set in accordance with the actual strength. In the cross-sectional views of the corner posts of Figs. 2 to 10, the folding R (normally about R = 1.5 to 2.5 t in the center of the thickness of the plate thickness) accompanying the forming of the corner posts is omitted, R) exists, the dimension such as the width dimension of the surface portion can be determined from the last point of R as a starting point.

In addition, the best configuration, method, and the like for carrying out the present invention are described above, but the present invention is not limited thereto. While the present invention has been particularly shown and described with respect to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form, material, quantity, and the like may be made without departing from the spirit and scope of the present invention, In other detailed configurations, those skilled in the art can apply various modifications.

Therefore, the description defining the shape, material, and the like described above is merely illustrative for ease of understanding of the present invention and is not intended to limit the present invention. Therefore, the description in the name of the member other than the entirety is included in the present invention.

1: Cargo Container

2: Side panel

3: Front and rear panel

4, 4A, 4B, 4C, 4D, 4E, 4F: corner post

5: Corner fitting

6: Cloth scene panel

40: front end corner portion

40A: third corner portion

40B: fourth corner portion

40C: first corner portion

40D: the second corner portion

41: first connection

42: second connection

43: first protruding surface portion

43A: the inclined first projecting surface portion

44: second projection surface

44A: an inclined second projecting surface portion

45: first side portion

46: second side surface portion

47: inclined side surface portion

48, 49: slope chamfer

50: end convex shape curved portion

51, 52: convex shape chamfer

53: end concave curved surface portion

54, 55: Concave chamfer

56: Middle bend

57: Middle bend

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