JP7424650B2 - Square pipe joint structure and transport container using it - Google Patents

Description

The present invention relates to a transport container having a frame made up of a plurality of square pipes, and particularly to a joint structure for square pipes that allows easy assembly and disassembly of the frame, and a transport container using the same.

2. Description of the Related Art When delivering highly rigid and heavy objects such as automobile parts to customers, a metal transport container equipped with a frame made of a plurality of rod-shaped bodies is sometimes used. FIG. 9 is a perspective view showing an example of the appearance of the frame of such a transport container. Note that in order to avoid complicating the diagram, only some of the symbols related to the rod-shaped bodies are given.
As shown in FIG. 9, the frame 50 of the transport container, which has a substantially rectangular parallelepiped shape, is formed by a plurality of rod-shaped bodies 51 arranged in parallel with the horizontal and vertical directions, and the bottom of the frame 50 is provided with a hook for a forklift. An insertion portion 50a is provided for inserting the.
Both end surfaces of another rod-shaped body 51 are welded to the side surfaces 51a, 51a of the pair of rod-shaped bodies 51, 51 arranged in parallel. That is, the above-mentioned pair of rod-shaped bodies 51, 51 are connected to each other via another rod-shaped body 51. Note that a reinforcing plate 52 may be attached to the joint portion of the rod-shaped body 51.
In this way, when two mutually orthogonal bars are joined by welding, if the side surfaces of the bars are not flat, the angle between the bars tends to change during the welding operation. Therefore, it is difficult to maintain an orthogonal state between the two. Therefore, bar materials to be welded are often used having a rectangular cross-sectional outline. Moreover, since there are many rods constituting the transport container and their weight accounts for most of the weight of the entire transport container, it is desirable that the rods have a hollow structure. For this reason, a square pipe is usually used as the rod-shaped body 51 that constitutes the transport container as shown in FIG.

In two rod-shaped bodies 51, 51 arranged perpendicularly to each other, if the rod-shaped body 51 is a square pipe, when welding one rod-shaped body 51 to the other rod-shaped body 51, the outline of the cross section It is easier to maintain the orthogonal relationship between the two than in the case where they are not rectangular. However, since welding work requires a certain degree of skill, it is difficult for inexperienced workers to weld two rod-shaped bodies made of square pipes arranged orthogonally to each other. It is never easy to keep the angle unchanged. That is, if it is necessary to weld together the rod-like bodies that constitute the frame of the transport container, it is difficult for an inexperienced worker to manufacture such a transport container.
Therefore, in recent years, bolts are often used to join the metal rod-shaped bodies that constitute the frame of the transport container. Some inventions and ideas regarding this have already been disclosed.

For example, Patent Document 1 has the title ``Method for removably connecting square pipes into a front T-shape or L-shape,'' and when assembling a shelf frame etc. using square pipes, the square pipes are bolted together to form an L-shape. Alternatively, an invention related to a technique for connecting in a T-shape is disclosed.
The invention disclosed in Patent Document 1 is a T-shaped aluminum joint in which a steel nut is fitted and fixed, and a screw hole is provided on the side surface of the joint, and the joint has a bolt hole on three sides. It is characterized by using a connecting plate having a substantially isosceles triangular shape in plan view, which is connected with bolts and nuts to the side surface of the connecting plate.
According to such a method, it is possible to perform the connection operation of square pipes easily and quickly, and moreover, the mutual positions of the square pipes connected by bolt and nut connections to the three connecting hands are common to the connecting plate. Since the bolts and nuts are fixed in place, it is difficult for the bolt/nut connection to loosen over time.

In addition, Patent Document 2 has the name "unit box frame joint structure" and describes a unit box frame in which ceiling beams and floor beams are connected between the upper ends and lower ends of four corner columns made of steel. An invention relating to a structure in which groove-shaped or square pipe-shaped small beams are joined between them is disclosed.
In the invention disclosed in Patent Document 2, the small beam has a bent piece formed by extending a pair of facing side plate parts beyond the upper and lower plate parts and bending the extended part outward, and this bent piece It is characterized by being bolted to the side of the girder.
According to such a joint structure of the unit box frame, it is possible to form a bent piece that becomes a joint piece at the end of the small beam by notching and bending. Everything up to and including joining can be realized without welding.

Further, Patent Document 3 discloses a device called a "fitting combination type joining member" that relates to a member that joins two square steel pipes by butting them against each other vertically or horizontally to form a T-shape.
The invention disclosed in Patent Document 3 is such that a convex locking portion provided on the end surface of the other square steel pipe is inserted into a rectangular locking hole provided on the side surface of one square steel pipe. It is characterized by joining two square steel pipes by butting them together in a T-shape.
According to the joining member having such a structure, it is possible to select a joining structure according to the purpose and application. It is also expected to shorten processing time and improve dimensional accuracy.

Japanese Patent Application Publication No. 2006-105184 Japanese Patent Application Publication No. 10-2008 Utility model registration No. 3135898

When the invention disclosed in Patent Document 1 is used to join the square pipes that constitute the frame of the transport container, the connecting plate protrudes from the side surface of the square pipes at the joint of the square pipes, so that the transport of the pipes becomes difficult. When a plurality of containers are loaded on the loading platform of a truck or the like, there is a high possibility that the number of transport containers that can be loaded on one truck will decrease, that is, the loading rate will decrease. Furthermore, there is a risk of damaging the surfaces of other transport containers and products stored therein.
In addition, in the invention disclosed in Patent Document 2, since the structure is such that the small beam is joined to the large beam by fixing the bent pieces of the small beam to the side surface of the large beam using bolts, the restraining force on the small beam is may be insufficient. In addition, since the difference between the inner diameter of the insertion hole provided in the bent piece and the outer diameter of the bolt affects the positioning of the small beam in a plane parallel to the bent piece, it is difficult to accurately position the small beam with respect to the large beam. The problem was that it could not be done.
Furthermore, in the device disclosed in Patent Document 3, two symmetrically arranged square steel pipes (for convenience, referred to as a first square steel pipe) having a rectangular locking hole are sandwiched between the square steel pipes. When joining a square steel pipe (for convenience, it will be referred to as a second square steel pipe) to a first square steel pipe, the locking parts of the two second square steel pipes interfere with each other, so the first square steel pipe The problem was that it could not be joined to steel pipes. In addition, when the second square steel pipe is joined to the first square steel pipe, the tip of the locking piece of the second square steel pipe protrudes from the locking hole of the first square steel pipe, so the transfer container When this invention is used to join square steel pipes that make up the frames of It may damage the surface of the product.

The present invention has been made in response to such conventional circumstances, and it is possible to easily connect two square pipes arranged perpendicularly to each other while accurately maintaining their positional relationship. Connection of square pipes that can be connected and that does not reduce the loading rate or damage the surface of other transport containers or products stored inside when transported by truck etc. The purpose is to provide a structure and a transport container using the same.

In order to achieve the above object, a first invention is a square pipe joining structure formed by connecting two square pipes made of metal arranged orthogonally to each other, wherein the two square pipes are connected to each other. , a fixing part is formed by a first notch and a cutout part provided in parallel to the longitudinal direction from the end surface of at least one of the pair of first side plates arranged in parallel, and a fixing part is formed at the base end of the fixing part. The first side plate has a locking portion formed by a second notch provided perpendicularly to the longitudinal direction from the fixing portion toward the side connected to one of a pair of second side plates perpendicular to the first side plate. It consists of a square pipe and a second square pipe in which the first opening, which is rectangular in plan view, is provided in the third side plate, and the first cut and cut portion are parallel to the longitudinal direction from the end surface. The lengths in the directions are equal, and the end surface of the other of the pair of second side plates in a direction parallel to the longitudinal direction protrudes toward the locking part by more than the thickness of the first side plate than the proximal end of the fixing part. The rectangle related to the first opening has a first side parallel to the longitudinal direction of the third side plate, a pair of second sides perpendicular to the first side, The first opening has a length that is longer than the distance between the outer surfaces of the pair of first side plates, and the length of the first side is longer than the distance between the outer surfaces of the pair of first side plates, and the length of the first side is longer than the distance between the outer surfaces of the pair of first side plates. The length obtained by subtracting the thickness of the fourth side plate perpendicular to the third side plate is longer than the length parallel to the longitudinal direction of the first side plate of the locking part, and the pair of second sides are The second notch is formed to reach the outer surface of the fourth side plate, and the second notch has a width that is wider than the thickness of the fourth side plate of the second square pipe so that the fourth side plate can be inserted and arranged inside. It is characterized by a wide area.

In the first invention, since the first square pipe is made of metal, the fixing portion can be easily bent toward the outer surface of the first side plate using a tool such as pliers. When the fixing part is bent at right angles to the outer surface of the first side plate, the inner surface of the pair of parallel inner surfaces that make up the second notch, the one facing the locking part, is on the same plane as the inner surface of the fixing part. form. When the fixed part is bent in this way, the inner surface of the locking part, which forms the same plane as the inner surface of the fixed part, is brought into contact with the outer surface of the fourth side plate of the second square pipe together with the inner surface of the fixed part. Then, the locking part can be inserted into the first opening of the second square pipe. Then, when the locking part of the first square pipe is inserted into the first opening of the second square pipe, the first square pipe forming the pair of second sides, respectively, when the third side plate is viewed from above. The inner surface of the opening comes into contact with the outer surface of the pair of first side plates, thereby restraining the movement of the first square pipe in a direction parallel to the longitudinal direction of the third side plate, and When the locking portion of the pipe locks with the fourth side plate of the second square pipe, movement of the first square pipe in a direction perpendicular to the longitudinal direction of the third side plate is restricted. At this time, since the inner surface of the fixing part is in contact with the outer surface of the fourth side plate, the fixing part also has the effect of restraining movement of the first square pipe in a direction perpendicular to the fourth side plate.

A second invention is based on the first invention, wherein the first side plate has a cut or a through hole formed at a position that becomes a valley fold line when the fixing part is bent toward the outer surface of the first side plate. It is characterized by the presence of
In the second invention, in addition to having the effect of the first invention, the bending rigidity of the part where the above-mentioned notch or through hole is formed in the first side plate is lower than that of other parts. Therefore, by forming the valley fold line at this point, it is possible to easily bend the first side plate of the fixing part toward the outer surface side.

A third invention is a square pipe joining structure formed by connecting two square pipes arranged perpendicularly to each other, wherein the two square pipes are connected to a pair of first square pipes arranged in parallel. a fixed part formed at the end of at least one of the side plates so that a part thereof is bent outward at a right angle; and a pair of second side plates perpendicular to the first side plate at the base end of the fixed part. The first square pipe is rectangular in plan view, and the first square pipe has a locking part formed by a second notch provided perpendicularly to the longitudinal direction of the first side plate from the fixed part toward the side connected to the first side. a second square pipe in which the first opening is provided in the third side plate; is formed so as not to protrude toward the locking part by more than the thickness of the first side plate, and the rectangle related to the first opening is parallel to the first side parallel to the longitudinal direction of the third side plate. , a pair of second sides perpendicular to the first side, and the first side plate has a length of the first side so that the locking part can be inserted into the first opening. The length obtained by subtracting the thickness of the fourth side plate perpendicular to the third side plate from the length of the pair of second sides is the length in the longitudinal direction of the first side plate of the locking part. is longer than the length parallel to the fourth side plate, and is formed so that the pair of second sides reach the outer surface of the fourth side plate, and the second notch allows the fourth side plate to be inserted and placed inside. , the width is wider than the thickness of the fourth side plate of the second square pipe.

The third invention is based on the first invention, assuming that the square pipe is not made of metal but is made of a material whose fixing portion is not easy to bend, such as plastic. Therefore, the configuration of the third invention is similar to the third invention except that the fixing part is provided at the end of the first side plate so that a part of the first side plate is bent at right angles to the outer surface side. This is the same as invention No. 1. Therefore, in the third invention, similarly to the case where the fixing part is bent in the first invention, the inner surface of the locking part that forms the same plane as the inner surface of the fixing part is attached to the fourth side plate of the second square pipe. The locking portion can be inserted into the first opening of the second square pipe while in contact with the outer surface of the second square pipe. When the locking part of the first square pipe is inserted into the first opening of the second square pipe, the third side plate, when viewed from above, has a second side that forms a pair of second sides. The inner surface of the first opening comes into contact with the outer surface of the pair of first side plates, thereby restricting movement of the first square pipe in a direction parallel to the longitudinal direction of the second square pipe, and The first aspect is that the movement of the first square pipe in a direction perpendicular to the longitudinal direction of the third side plate is restricted by the locking part of the pipe locking on the fourth side plate of the second square pipe. The effect of the invention is similarly exhibited. Further, at this time, movement of the first square pipe in a direction perpendicular to the longitudinal direction of the fourth side plate is also restrained by the inner surface of the fixing portion that is in contact with the outer surface of the fourth side plate.

A fourth invention is the invention according to any one of the first to third inventions, wherein the second square pipe is provided with a second opening having a rectangular shape in plan view on the fourth side plate, and The rectangle related to the opening has a third side parallel to the longitudinal direction of the fourth side plate and a pair of fourth sides perpendicular to the third side, and the second opening has The length of the third side is longer than the distance between the outer surfaces of the pair of first side plates, and the length of the pair of fourth sides is the length of the first side plate of the locking part so that the locking part can be inserted. The length is equal to the length perpendicular to the longitudinal direction minus the length of the second notch, and the fourth side is formed so as to reach the third side plate, and the pair of fourth sides are It is characterized by forming the same plane as the pair of second sides of the first opening.
In addition, in the fourth invention, "the length of the pair of fourth sides is equal to the length obtained by subtracting the length of the second notch from the length perpendicular to the longitudinal direction of the first side plate of the locking part. ” In the case where “the length of the pair of fourth sides is approximately equal to the length perpendicular to the longitudinal direction of the first side plate of the locking portion minus the length of the second notch” Also included. Moreover, "the fourth side reaches the third side plate" means "the fourth side reaches the outer surface of the third side plate".
The fourth invention has a structure in which the locking part of the first square pipe can be inserted into the second opening of the second square pipe at the same time as the first opening. Therefore, when the locking part of the first square pipe is inserted into the first opening and the second opening, in the fourth invention, the invention according to any one of the first invention to the third invention In addition to the above effect, the outer surface of the second side plate of the first square pipe and the outer surface of the third side plate of the second square pipe form the same plane.

A fifth invention is a bolt according to any one of the first to fourth inventions, wherein a bolt insertion hole is provided in the fixing part of the first square pipe, and a female thread is formed on the inner peripheral surface of the bolt. When the hole is provided in the fourth side plate of the second square pipe and the fourth side plate is viewed from above, the distance perpendicular to the third side plate from the outer surface of the third side plate to the center of the bolt hole is: Equal to the distance perpendicular to the second side plate from the outer surface of the second side plate closer to the locking part to the center of the bolt insertion hole, and from the side closer to the bolt hole of the pair of fourth sides to the bolt hole The distance parallel to the third side plate and the fourth side plate to the center of is equal to the distance parallel to the outer surface of the fixing part and the second side plate from the base end of the fixing part to the center of the bolt insertion hole. shall be.
In the fifth invention, in addition to the effects of any one of the first to fourth inventions, the first square pipe is arranged perpendicularly to the second square pipe, and the second square pipe is arranged perpendicularly to the second square pipe. When the locking part of the first opening is inserted into the first opening, the bolt inserted into the bolt insertion hole can be screwed into the bolt hole.

A sixth invention is based on the fifth invention, characterized in that the bolt insertion hole is an elongated hole having arcuate ends, and is elongated parallel to the longitudinal direction of the first side plate. It is.
In the sixth invention, in addition to the effect of the fifth invention, a certain degree of deviation of the center of the bolt insertion hole of the first square pipe from the center of the bolt screwed into the bolt hole of the second square pipe is allowed. It has the effect of

A seventh invention includes the square pipe joining structure according to any one of the first to sixth inventions, and includes a frame assembled by a plurality of first square pipes and a plurality of second square pipes. The present invention relates to a transport container characterized by having:
In the transport container having such a structure, the same effect as in the square pipe joining structure according to any one of the first to sixth inventions is exhibited.

In the first invention, the first square pipe and the second square pipe are arranged so as to be orthogonal to each other, and the inner surface of the fixing part, which is bent at right angles to the outer surface side of the first side plate of the first square pipe, is arranged so as to be perpendicular to each other. When the locking part of the first square pipe is inserted into the first opening of the second square pipe while it is in contact with the outer surface of the fourth side plate of the second square pipe, the second square pipe Since movement of the first square pipe in directions parallel and perpendicular to the longitudinal direction is restricted, it is possible to join the first square pipe to the second square pipe without welding. Therefore, according to the first invention, square pipes can be joined together at a lower cost than when welding.
Further, in the first invention, it is possible to join the first square pipe and the second square pipe by simply forming notches, openings, or cut parts in the side plates of the first square pipe and the second square pipe. Processing costs are low. Furthermore, since neither the first square pipe nor the second square pipe that has been subjected to these processes has a protruding part on the outer surface side of the side plate, they can be bundled together without distinguishing them. It is possible. Then, the customer can easily bend the fixed part using tools such as pliers, so the multiple first square pipes and second square pipes are bundled together as described above. It is possible to deliver the product to the customer in the same condition. In this case, since it is not bulky, it is possible to increase the loading rate when transported by truck or the like, and to save storage space.

According to the second invention, in addition to the effects of the first invention, by forming the portion where the notch or through hole is provided as a valley fold line, the fixing portion can be formed on the outer surface at right angles to the first side plate. It has the effect of being able to be accurately bent to the side.

In the third invention, the first square pipe and the second square pipe are arranged to be perpendicular to each other, and the inner surface of the fixed part of the first square pipe is aligned with the outer surface of the fourth side plate of the second square pipe. When the locking part of the first square pipe is inserted into the first opening of the second square pipe in a state where they are in contact with each other, the first square pipe moves in parallel and perpendicular directions to the longitudinal direction of the second square pipe. Since the movement of the square pipe is restricted, the first square pipe can be joined to the second square pipe without using an adhesive or the like. Therefore, according to the third invention, it is possible to join square pipes together more easily than when using an adhesive or the like.

In the fourth invention, in addition to the effects of any one of the first to third inventions, when the transport container is formed by the first square pipe and the second square pipe, the first square pipe Since the outer surface of the second side plate of the second square pipe does not protrude beyond the outer surface of the third side plate of the second square pipe, the loading rate may decrease when multiple transport containers are loaded onto the loading platform of a truck or the like. This has the effect that there is no risk of damaging the surface of other transport containers or the products stored therein. In addition, in a place where the first square pipe is installed so that the outer surface of the second side plate faces the inside of the transport container, the outer surface of the first square pipe is larger than the outer surface of the third side plate of the second square pipe. Since the outer surface of the second side plate does not protrude toward the inside of the transport container, it is possible to provide a large space in which the product is accommodated within the transport container.

According to the fifth invention, in addition to the effects of any one of the first to fourth inventions, the first square pipe is arranged perpendicularly to the second square pipe, and the second square pipe is arranged perpendicularly to the second square pipe. When the locking part of the first square pipe is inserted into the first opening of the pipe, the bolt inserted into the bolt insertion hole provided in the fixing part of the first square pipe is inserted into the second square pipe. Since it can be screwed into the bolt hole, by tightening this bolt and fixing the fixing part to the second square pipe, the joint strength of the first square pipe to the second square pipe can be increased. play.

In the fifth invention, unless the angle between the fixing part and the first side plate is exactly right angle, the bolt inserted into the bolt insertion hole cannot be screwed into the bolt hole. In the invention, since the structure allows for some deviation of the center of the bolt insertion hole from the center of the bolt screwed into the bolt hole, the angle formed by the fixing part and the first side plate is not a perfect right angle. In this case, the bolt inserted into the bolt insertion hole can also be screwed into the bolt hole of the second square pipe. That is, in the sixth aspect of the invention, it is possible to bolt the first square pipe to the second square pipe even if the fixing portion to the first side plate is not completely bent. Therefore, according to the sixth invention, in addition to the effects of the fifth invention, there is an effect that the workability when bolting the first square pipe to the second square pipe is excellent.

According to the transport container according to the seventh invention, the same effects as in the square pipe joining structure according to any one of the first to sixth inventions are exhibited.

(a) and (b) are external perspective views of a first square pipe provided with a square pipe joining structure according to an embodiment of the present invention, and (c) is an external perspective view as seen in the direction of arrow A in FIG. It is a diagram. (a) is a perspective view showing a state in which the fixing part is bent at right angles to the outside of the first square pipe in FIG. 1(a), and (b) and (c) are B in FIG. They are a ₁ direction arrow view and a B ₂ direction arrow view. (a) is an external perspective view of a second square pipe equipped with a square pipe joining structure according to an embodiment of the present invention, and (b) and (c) are respectively arrows in the C direction in the figure (a). They are a perspective view and a view taken in the direction of arrow D. (a) is an external perspective view showing a state in which a first square pipe and a second square pipe are joined, and (b) is a cross-sectional view taken along the line E--E in the same figure (a). (a) and (b) are external perspective views of a first modified example of the first square pipe shown in FIG. 1(a) and the second square pipe shown in FIG. 3(a), respectively; c) is an external perspective view showing a state in which the first rectangular pipe shown in FIG. 3(a) is joined to the second rectangular pipe shown in FIG. (a) is an external perspective view of a second modified example of the first square pipe shown in FIG. 1(a), and (b) is a second modification of the second square pipe shown in FIG. It is an external perspective view of a modification. (a) is an external perspective view showing a state in which the first square pipe shown in FIG. 1(a) is respectively joined to the two side plates of the second square pipe shown in FIG. 6(b); b) is a sectional view taken along the line FF in FIG. FIG. 1 is an external perspective view of a frame of a transport container according to an embodiment of the present invention. FIG. 2 is an external perspective view of a frame of a transport container according to the prior art.

The joint structure of the transportation container of the present invention and the square pipe used therein will be specifically explained using FIGS. 1 to 8. In the square pipe joining structure of the present invention, the portion of the first square pipe sandwiched between the pair of first side plates is referred to as a second side plate. Further, in this embodiment, the square pipe is made of metal, but even if the square pipe is made of plastic, some of the functions and effects of the present invention relating to the joint structure of square pipes can be similarly exhibited. Further, the square pipe has openings and notches on the side surface, and these can be easily processed using a three-dimensional laser processing machine as described later.

FIGS. 1A and 1B are perspective views showing an example of the appearance of a first square pipe provided with a square pipe joining structure according to an embodiment of the present invention. Further, FIG. 1(c) is a view taken in the direction of arrow A in FIG. 1(a). Note that FIG. 1(b) is shown in a more enlarged state than FIG. 1(a). Moreover, FIG. 2(a) shows a state in which the fixing part in FIG. 1(a) is bent at right angles to the outside of the first square pipe, and FIGS. 2(b) and 2(c) respectively FIG. 2A is a view taken in _{the B1} direction and a view taken in the _B2 direction in FIG. 2(a).
As shown in FIGS. 1(a) to 1(c) and FIGS. 2(a) to 2(c), the first square pipe 1 includes a pair of first side plates 1a, 1a arranged in parallel. and a pair of second side plates 1b and 1c arranged perpendicular to the first side plate 1a.
The first side plate 1a is partially cut into a rectangular shape at both ends (see cut portions 1d and 1e in FIG. 1(c)), so that the end surfaces 2a and 2b are aligned with respect to the longitudinal direction of the first side plate 1a. A rectangular plate-shaped fixing portion 3 is formed by the cut portion 1e and the first notch 4a provided from the end surface 2c (see FIG. 1(c)) in parallel with the longitudinal direction. ing. In addition, since two sides of the four sides constituting the rectangle are parallel to the longitudinal direction of the first side plate 1a, the cut portion 1e can be cut from the end surface of the first side plate 1a similarly to the first notch 4a. It can be said that it is provided parallel to the longitudinal direction. Further, the first notch 4a and the cut portion 1e have equal lengths in a direction parallel to the longitudinal direction of the first side plate 1a from the end surface.
In the fixing portion 3, a bolt insertion hole 3a, which is an elongated hole having arcuate ends at both ends, is formed in an elongated manner parallel to the longitudinal direction of the first side plate 1a. Note that the end surface 2c is different from the above-mentioned end surfaces 2a and 2b that are newly formed by providing the cut portions 1d and 1e in the first side plate 1a, and is the same as the end surface of the side plate 1a before such processing. corresponds to a part.
In addition, a second square pipe 6, which will be described later, is attached to the first side plate 1a toward the side connected to the second side plate 1b at the base end 3c (see FIG. 1(c)) of the fixing part 3. A linear second notch 4b is provided perpendicular to the longitudinal direction of the first side plate 1a so that the fourth side plate 6c (see FIG. 3(a)) can be inserted therein. As described above, the second notch 4b and the cutout portion 1d form the rectangular plate-shaped locking portion 5. Note that the locking portion 5 is separated from the fixing portion 3 by the first notch 4a (see FIG. 1(c)).
Furthermore, a pair of L-shaped third notches 4c, 4c are provided to form two corners on the base end 3c side of the fixing portion 3, and the first one of the third notches 4c, 4c is A through hole 4d is formed between the third notches 4c and 4c so as to be disposed approximately on the same straight line as a portion perpendicular to the longitudinal direction of the side plate 1a. On the other hand, the second side plates 1b, 1c have end surfaces 2d, 2d by cutting both ends into a rectangular shape (see the cutout part 1f in FIG. 2(b) and the cutout part 1g in FIG. 2(c)). The end faces 2e, 2e are formed perpendicularly to the longitudinal direction thereof. Note that the end surface 2e of the second side plate 1c forms the same plane as the end surface 2b of the first side plate 1a. That is, the second side plate 1c is in a state in which the end surface 2e does not protrude toward the locking part 5 in the direction parallel to the longitudinal direction by more than the thickness of the first side plate 1a than the base end 3c of the fixing part 3. It has become.

Among the third notches 4c, 4c, the portion perpendicular to the longitudinal direction of the first side plate 1a and the portion where the through hole 4d is formed have lower rigidity against bending than other portions, so the portion thereof is If it is set as the valley fold line 1h (see FIG. 1(c)), the bending work of the fixing part 3 becomes easier, so it is necessary to accurately bend the fixing part 3 outward so as to form a right angle to the first side plate 1a. Can be done. The second notch 4b is provided in the first side plate 1a so that the inner surface 8c (see FIG. 1(c)) on the side facing the locking part 5 forms the same plane as the end surfaces 2b and 2e. There is. Furthermore, the portions of the third notches 4c, 4c that are perpendicular to the longitudinal direction of the first side plate 1a and the through holes 4d are arranged so that the above-mentioned valley fold line 1h is the same as that of the through hole 4d when the first side plate 1a is viewed from above. The first side plate 1a is provided at a position shifted away from the end surface 2b by the thickness of the first side plate 1a. Therefore, when the fixing part 3 is bent toward the outer surface of the first side plate 1a at right angles to the first side plate 1a as shown in FIGS. 2(a) to 2(c), the inner surface 3b of the fixing part 3 The inner surface 8c of the notch 4b on the side facing the locking portion 5 and the end surfaces 2b and 2e form the same plane. In addition, this plane becomes a contact surface when joining the 1st square pipe 1 to another square pipe so that it may mention later.

FIG. 3(a) is a perspective view showing an example of the appearance of a second square pipe provided with a square pipe joining structure according to an embodiment of the present invention, and FIGS. 3(b) and 3(c) are a view taken in the C direction and a view taken in the D direction in FIG. 3(a), respectively. Moreover, FIG. 4(a) is an external perspective view showing a state in which the first square pipe and the second square pipe are joined, and FIG. 4(b) is an external perspective view as viewed from the line EE in FIG. 4(a). FIG.
As shown in FIGS. 3(a) to 3(c), the second square pipe 6 has third side plates 6a, 6b parallel to each other, and a fourth side plate perpendicular to the third side plates 6a, 6b. It is composed of side plates 6c and 6d.
The third side plate 6a and the fourth side plate 6c have a rectangular shape when viewed from above, and two perpendicular sides of the four sides forming the rectangle are the third side plate 6a and the fourth side plate 6c, respectively. A first opening 7a and a second opening 7b are formed perpendicularly and parallel to the longitudinal direction of the opening 7a. The first opening 7a is formed in the rectangular shape so that second sides 15b, 15b (see FIG. 3(b)) perpendicular to the longitudinal direction of the third side plate 6a reach the outer surface of the fourth side plate 6c. The second opening 7b has fourth sides 15d, 15d (see FIG. 3(c)) perpendicular to the longitudinal direction of the fourth side plate 6c in the rectangular shape formed on the outer surface of the third side plate 6a. It is formed to reach. As a result, the first opening 7a and the second opening 7b constitute a cutout having an L-shape in cross section, and the third side plate 6a and the third side plate 6a and the The inner surfaces 8a and 8b, which are perpendicular to the longitudinal direction of the side plate 6c of No. 4, are arranged on the same plane.

The first opening 7a and the second opening 7b are formed such that a pair of locking portions 5, 5 can be inserted thereinto. Specifically, the first side 15a (see FIG. 3(b)) and the third side 15c (see FIG. 3(b)) of the rectangle are parallel to the longitudinal direction of the third side plate 6a and the fourth side plate 6c, respectively. The length L ₁ (see FIGS. 3(b) and 3(c)) is the distance w ₁ (see FIG. 2 3(b)) and is _{perpendicular} to the longitudinal direction of the third side plate 6a at the first opening 7a. The length obtained by subtracting the plate thickness of 6c is longer than the length w ₂ (see FIG. 1(c)) parallel to the longitudinal direction of the first side plate 1a of the locking portion 5 in the first square pipe 1. That is, the first opening 7a provided in the third side plate 6a of the second square pipe 6 is connected to the first opening 7a provided at the end of the first square pipe 1, as shown in FIG. 4(a). It has a structure in which the locking parts 5, 5 (see FIG. 1(a)) can be inserted.
In addition, in the second opening 7b, the length s ₂ (see FIG. 3(c)) of the fourth side 15d perpendicular to the longitudinal direction of the fourth side plate 6c is the locking portion of the first square pipe 1. The length w3 (see FIG _. 1(c)) obtained by subtracting the length of the second notch _4b from the length w5 (see FIG. 1(c)) perpendicular to the longitudinal direction of the first side plate 1a of No. 5. equal. That is, the second opening 7b can also fit the pair of locking parts 5, 5 (see FIG. 1(a)) provided at the end of the first square pipe 1, and As shown in FIG. 4(a), a pair of locking portions 5, 5 (FIG. 1( a)) is inserted, the outer surface of the second side plate 1b of the first square pipe 1 and the outer surface of the third side plate 6a of the second square pipe 6 form substantially the same plane. It becomes. At this time, as shown in FIG. 4(b), the upper part of the fourth side plate 6c is placed inside the second notch 4b (see FIG. 1(a)), and the locking portion 5 (see FIG. 1(a)) ) is engaged with the upper part of the fourth side plate 6c. Thereby, movement of the first square pipe 1 in the direction perpendicular to the longitudinal direction of the third side plate 6a of the second square pipe 6 is restrained. Further, in the first opening 7a, a pair of inner surfaces 8a, 8a (see FIG. 3(b)) perpendicular to the longitudinal direction of the third side plate 6a are a pair of first side plates 1a in the first square pipe 1, By coming into contact with the outer surface of 1a, movement of the first square pipe 1 in a direction parallel to the longitudinal direction of the third side plate 6a is restrained. Furthermore, by the fixing part 3 whose inner surface 3b (see FIGS. 2(b) and 2(c)) is in contact with the outer surface of the fourth side plate 6c of the second square pipe 6, a part perpendicular to the fourth side plate 6c is fixed. Movement of the first square pipe 1 in the direction is restricted.

A bolt 9 (see FIG. 4(a)) inserted into a bolt insertion hole 3a (see FIG. 1(a)) provided in the fixing part 3 of the first square pipe 1 is screwed into the fourth side plate 6c. A pair of bolt holes 7c, 7c with mating female threads formed on the inner peripheral surface pass through the center of the width of the second opening 7b (the length parallel to the longitudinal direction of the fourth side plate 6c), and They are provided symmetrically with respect to a plane perpendicular to the longitudinal direction of the fourth side plate 6c. Note that the distance s 3 perpendicular to the third side plate 6a from the outer surface of the third side plate 6a to the center of the bolt hole 7c (see FIG. 3(c)) is the distance s ₃ (see FIG. 3(c)) of the second side plate 1b in the first square pipe 1. Equal to the distance w ₄ perpendicular to the second side plate 1b from the outer surface to the center of the bolt insertion hole 3a (see FIG. 1(c)), when the fourth side plate 6c of the second square pipe 6 is viewed from above. In the first square pipe 1, the distance _L2 parallel to the third side plate 6a and the fourth side plate 6c from the center of the bolt hole 7c to the inner surface 8b of the second opening 7b (see FIG. 3(c)) is Distance parallel to the outer surface of the fixing part 3 and the second side plate 1b from the base end 3c of the fixing part 3 (see FIG. 1(c)) to the center of the bolt insertion hole 3a when the first side plate 1a is viewed from above It is equal to w ₆ (see FIG. 1(c)). That is, the bolt holes 7c, 7c are formed by arranging the first square pipe 1 perpendicularly to the second square pipe 6 as shown in FIG. 4(a), and forming the first opening 7a and the second opening. A pair of locking portions 5, 5 (see FIG. 1(a)) are fitted into the portion 7b (see FIG. 3(a)), and the inner surface 8c of the second notch 4b on the side facing the locking portion 5 is inserted. (see FIG. 1(c)), with the end surfaces 2b, 2e and the inner surface 3b of the fixing part 3 (see FIGS. 2(b) and 2(c)) in contact with the fourth side plate 6c, The structure is such that two bolts 9, 9 (see FIG. 4(a)) inserted into the bolt insertion holes 3a, 3a (see FIG. 1(a)) can be screwed in at the same time. Therefore, when the bolts 9, 9 inserted through the pair of bolt insertion holes 3a, 3a are screwed into the bolt holes 7c, 7c, the fixing portion 3 is fixed to the second square pipe 6. This increases the bonding strength of the first square pipe 1 to the second square pipe 6. The bolt insertion hole 3a, which is an elongated hole parallel to the longitudinal direction of the first side plate 1a and has arcuate ends, is centered with respect to the center of the bolt 9 screwed into the bolt hole 7c. Even if there is a misalignment, the structure allows this misalignment to some extent. Therefore, if the angle between the fixed part 3 and the first side plate 1a is deviated from a right angle, or if the fixed part 3 is bent perpendicularly to the first side plate 1a, when machining the bolt insertion hole 3a, In this case, there is a slight misalignment between the center of the bolt insertion hole 3a and the center of the bolt hole 7c when the inner surface 3b of the fixing part 3 is in contact with the outer surface of the third side plate 6c due to a malfunction or the like. Also, it is possible to screw the bolt 9 inserted into the bolt insertion hole 3a into the bolt hole 7c. That is, it can be said that the first square pipe 1 and the second square pipe 6 have a structure with excellent workability when bolted together.

5(a) and 5(b) are external perspective views of a first modified example of the first square pipe shown in FIG. 1(a) and the second square pipe shown in FIG. 3(a), respectively. 5(c) shows a state in which the first square pipe shown in FIG. 5(a) is joined to the second square pipe shown in FIG. 5(b). 6(a) is an external perspective view of a second modified example of the first square pipe shown in FIG. 1(a), and FIG. 6(b) is an external perspective view of the second modified example of the first square pipe shown in FIG. It is an external perspective view of the 2nd modification of the square pipe. Further, FIG. 7(a) shows a state in which the first square pipe shown in FIG. 1(a) is respectively joined to the two side plates of the second square pipe shown in FIG. 6(b), FIG. 7(b) is a sectional view taken along line FF in FIG. 7(a). Note that the constituent elements of the first rectangular pipe 1 and the second rectangular pipe 6 that have already been described using FIGS. 1 to 4 are given the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 5(a), the first square pipe 10 has a pair of first side plates 1a, 1a in the first square pipe 1 (see FIGS. 1(a) to 1(c)). The structure is such that the fixing portion 3 is formed only on one side plate. The first side plate 1a on which the fixing part 3 is not formed is partially cut into a rectangular shape so that the end surface 2f is perpendicular to the longitudinal direction of the first side plate 1a and has a second notch. It is provided so as to form the same plane with the inner surface 8c (see FIG. 1(c)) of the side facing the locking portion 5 of 4b and the end surfaces 2b and 2e.
As shown in FIG. 5(b), the second square pipe 11 has a first opening 7a and a second opening 7a in the second square pipe 6 (see FIGS. 3(a) to 3(c)). The opening 7b has a first side 15a and a third side 15c parallel to the longitudinal direction of the third side plate 6a and the fourth side plate 6c (FIG. 3( b) and FIG. 3(c)) are formed to reach the edge 11a, and the fourth side plate 6c is provided with only one bolt hole 7c.
As shown in FIG. 5(c), the first square pipe 10 is arranged so as to form an L-shape in plan view with respect to the second square pipe 11, and the first opening 7a and the second opening 7b ( The locking part 5 (see FIG. 5(a)) is inserted into the locking part 5 (see FIG. 5(b)), and the inner surface 8c of the second notch 4b on the side facing the locking part 5 (see FIG. 1(c)) is inserted into the locking part 5 (see FIG. 5(b)). ), the bolt is inserted into the bolt insertion hole 3a with the end surfaces 2b, 2e, 2f and the inner surface 3b of the fixing part 3 (see FIGS. 2(b) and 2(c)) in contact with the fourth side plate 6c. When the bolt 9 is screwed into the bolt hole 7c, the first square pipe 10 is joined to the second square pipe 11. That is, the first square pipe 10 and the second square pipe 11 can be used when two square pipes are joined to form an L-shape in plan view.

As shown in FIG. 6(a), the first square pipe 12 has a first side plate 1a and a second side plate 1b. A first opening 7a and a second opening 7b are provided in the side plate 1b, and a pair of bolt holes 7c, 7c are also provided in the second side plate 1b. Further, in the second square pipe 6 (see FIGS. 3(a) to 3(c)), the second square pipe 13 has a fourth side plate in addition to the fourth side plate 6c and the third side plate 6b. 6d and the third side plate 6b are also provided with a first opening 7a and a second opening 7b, and in addition to the fourth side plate 6c, the third side plate 6b is also provided with a pair of bolt holes 7c, 7c. It has a built-in structure.
The two first square pipes 1, 1 are arranged perpendicularly to the third side plate 6b and fourth side plate 6c of the second square pipe 13, as shown in FIG. As shown in (b), one end of the first square pipe 1 is provided at the first opening 7a and the second opening 7b provided in the fourth side plate 6d and the third side plate 6b. At the same time, the other first corner is inserted into the first opening 7a and the second opening 7b provided in the third side plate 6a and the fourth side plate 6c. A pair of locking portions 5, 5 provided at the end of the pipe 1 are inserted. Furthermore, the inner surface 8c of the second notch 4b of the first square pipe 1 on the side facing the locking portion 5 (see FIG. 1(c)), the end surfaces 2b and 2e, and the inner surface 3b of the fixing portion 3 (see FIG. 2(b)) in contact with the third side plate 6b, insert the two bolts 9, 9 (see FIG. 4(a)) inserted into the bolt insertion holes 3a into the third side plate 6b. In addition to screwing into the bolt holes 7c, 7c, the inner surface 8c (see FIG. 1(b)) of the second notch 4b of the other first square pipe 1 on the side facing the locking portion 5, and the end surfaces 2b, 2e With the inner surface 3b of the fixed part 3 (see FIG. 2(b)) in contact with the fourth side plate 6c, the two bolts 9, 9 (see FIG. 4(a)) inserted into the bolt insertion holes 3a are ) into the bolt holes 7c, 7c of the fourth side plate 6c. As a result, the two first square pipes 1, 1 arranged perpendicularly to each other are joined perpendicularly to the second square pipe 13, respectively. In this way, the second square pipe 13 is created by joining two square pipes arranged to form an L-shape in plan view, and to the corners of the two square pipes, other square pipes arranged perpendicularly to the respective square pipes are joined. (See FIG. 7(a)).

As described with reference to FIGS. 1 to 7, the square pipe joining structure of the present invention includes first square pipes 1, 10, 12 and second square pipes 6, 11, 13. It is a feature. Since the first square pipes 1, 10, and 12 are made of metal, the fixing portion 3 can be easily bent toward the outer surface of the first side plate 1a using a tool such as pliers. Therefore, one of the first square pipes 1, 10, 12 and one of the second square pipes 6, 11, 13 are arranged so as to be perpendicular to each other, and the first side plate 1a of the first square pipe is With the inner surface 3b of the fixing part 3 bent at right angles to the outer surface side in contact with the outer surface of the fourth side plate 6c of the second square pipe, the locking part 5 of the first square pipe is connected to the second square pipe. When inserted into the first opening 7a and second opening 7b, movement of the first square pipe in directions parallel and perpendicular to the longitudinal direction of the second square pipe is restricted. Therefore, when manufacturing the frame 14 by joining the first square pipe to the second square pipe, there is no need to perform welding work. In this case, no welding equipment is required, and even an unskilled person can join the square pipes. That is, according to the square pipe joining structure of the present invention, square pipes can be easily joined at low cost.
In addition, the first square pipes 1, 10, 12 and the second square pipes 6, 11, 13 can be easily manufactured by simply machining notches or openings in the side plates of ordinary square pipes. It can be manufactured at low cost. Furthermore, since the first square pipes 1, 10, 12 and the second square pipes 6, 11, 13 do not have any protruding parts on the outer surface side of the side plates, they are grouped together without being distinguished. It is possible to bundle. If a tool such as pliers is used, the work of bending the fixing portion 3 can be easily carried out at the customer's site. Therefore, when loading the first square pipes 1, 10, 12 and the second square pipes 6, 11, 13 onto a truck bed, etc., it is best to bundle them together to reduce bulk. , the loading rate can be increased. Moreover, by bundling in this way, it is possible to save storage space.

FIG. 8 is a perspective view showing an example of the appearance of the frame of the transport container according to the embodiment of the present invention. In order to avoid complicating the diagram, only some of the symbols relating to the first square pipe and the second square pipe are given. Furthermore, the constituent elements shown in FIGS. 1 to 7 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
As shown in FIG. 8, the transport container of the present invention has a substantially rectangular parallelepiped shape, and includes a plurality of first square pipes 1, 10, 12 and a second square pipe arranged in parallel with the horizontal and vertical directions. It has a frame 14 assembled by 6 and 13. In the frame 14, the outer surface of the second side plate 1b of the first square pipes 1, 10, 12 protrudes more than the outer surface of the third side plate 6b and fourth side plate 6c of the second square pipe 6, 13. does not exist, and the outer surface of the second side plate 1c of the first square pipes 1, 10, 12 is closer to the transport container than the outer surface of the third side plate 6a and fourth side plate 6d of the second square pipes 6, 13. Because the container does not protrude inward, it may reduce the loading rate when multiple containers are loaded onto the platform of a truck or the like, or the surface of other containers or the products stored inside may be affected. There is no risk of causing damage to the Also, when the first square pipes 1, 10, 12 are installed so that the outer surface of the second side plate 1b faces inside the transport container, the third side plate 6a of the second square pipe 6, 13 Also, since the outer surfaces of the second side plates 1b of the first square pipes 1, 10, and 12 do not protrude toward the inside of the transport container than the outer surface of the fourth side plate 6d, the product is not stored in the transport container. You can take up a large amount of space.

In this embodiment, the fourth side plate 6c of the second square pipe 6 has a structure in which a bolt hole 7c having a female threaded portion is provided on the inner peripheral surface. It is not limited to such a structure. For example, a hole into which the bolt 9 (see FIG. 4(a)) is inserted is formed in the fourth side plate 6c, and a nut into which the bolt 9 inserted into the hole can be screwed is provided in the fourth side plate. It is also possible to have a structure in which it is installed on the inner surface side of 6c. In this case, a hole drilled in the fourth side plate 6c and a nut installed on the inner surface of the fourth side plate 6c serve as the bolt hole 7c.
Furthermore, in this embodiment, the first square pipes 1, 10, 12 and the second square pipes 6, 11, 13 constituting the transport container are made of metal, but these square pipes are made of plastic. Also good. However, if the first square pipes 1, 10, and 12 are made of plastic, it is not easy to bend the fixing part 3 toward the outer surface of the first side plate 1a. It is necessary to have a structure in which the fixing part 3 is provided at the end of the first side plate 1a so that the fixing part 3 is bent at a right angle toward the outer surface. In this case, one of the first square pipes 1, 10, 12 and one of the second square pipes 6, 11, 13 are arranged so as to be perpendicular to each other, and the inner surface 3b of the fixing part 3 of the first square pipe is is brought into contact with the outer surfaces of the third side plate 6b and fourth side plate 6c of the second square pipe, and the locking part 5 of the first square pipe is inserted into the first opening 7a and the second opening. 7b, the movement of the first square pipe in the directions parallel and perpendicular to the longitudinal direction of the second square pipe is restrained, so it is easier to insert the first square pipe than when using adhesive or the like. can be joined to the second square pipe.

The square pipe joining structure of the present invention can be used when joining two square pipes arranged perpendicularly to each other, and the transport container of the present invention can be used to load a plurality of square pipes on the loading platform of a truck or the like. It can be used when transporting.

1...First square pipe 1a...First side plate 1b, 1c...Second side plate 1d-1g...Removed portion 1h...Valley fold line 2a-2f...End face 3...Fixing part 3a...Bolt insertion hole 3b...Inner surface 3c ... Base end 4a... First notch 4b... Second notch 4c... Third notch 4d... Through hole 5... Locking part 6... Second square pipe 6a, 6b... Third side plate 6c, 6d... Third 4 side plate 7a...first opening 7b...second opening 7c...bolt hole 8a-8c...inner surface 9...bolt 10, 12...first square pipe 11, 13...second square pipe 11a...end Edge 14... Frame 15a... First side 15b... Second side 15c... Third side 15d... Fourth side 50... Frame 50a... Insertion part 51... Rod-shaped body 51a... Side surface 52... Reinforcement plate

Claims (7)

A square pipe joint structure formed by connecting two square metal pipes arranged perpendicularly to each other,
The two square pipes are
A fixing part is formed by a first notch and a cutout part provided in parallel with the longitudinal direction from the end surface of at least one of the pair of first side plates arranged in parallel, and at the proximal end of the fixing part. A locking portion is formed by a second notch provided perpendicularly to the longitudinal direction from the fixing portion toward the side connected to one of a pair of second side plates perpendicular to the first side plate. a first square pipe;
a second square pipe in which a first opening having a rectangular shape in plan view is provided in a third side plate;
The first cut and the cut portion have equal lengths in a direction parallel to the longitudinal direction from the end surface,
The other of the pair of second side plates is configured such that its end surface does not protrude toward the locking part in a direction parallel to the longitudinal direction by more than the thickness of the first side plate than the base end of the fixing part. It is formed in
The rectangle related to the first opening has a first side parallel to the longitudinal direction of the third side plate, and a pair of second sides perpendicular to the first side,
The first opening is configured such that the locking portion can be inserted into the first opening, and the length of the first side is longer than the distance between the outer surfaces of the pair of first side plates, and the length of the first side is longer than the distance between the outer surfaces of the pair of second sides. The length obtained by subtracting the thickness of the fourth side plate perpendicular to the third side plate from the length is longer than the length parallel to the longitudinal direction of the first side plate of the locking part, and The second side is formed to reach the outer surface of the fourth side plate,
The second notch is wider than the thickness of the fourth side plate of the second square pipe so that the fourth side plate can be inserted into the square pipe. Joint structure. The first side plate has a cut or a through hole formed at a position that becomes a valley fold line when the fixing part is bent toward the outer surface of the first side plate. The joint structure of square pipes according to 1. A square pipe joint structure formed by connecting two square pipes arranged perpendicularly to each other,
The two square pipes are
a fixing part formed at an end of at least one of a pair of first side plates arranged in parallel so that a part thereof is bent outward at a right angle; and the first side plate at a base end of the fixing part. A locking part is formed by a second notch provided perpendicularly to the longitudinal direction of the first side plate from the fixing part toward the side connected to one of the pair of second side plates perpendicular to the second side plate. a first square pipe;
a second square pipe in which a first opening having a rectangular shape in plan view is provided in a third side plate;
The other of the pair of second side plates is configured such that its end surface does not protrude toward the locking part in a direction parallel to the longitudinal direction by more than the thickness of the first side plate than the base end of the fixing part. It is formed in
The rectangle related to the first opening has a first side parallel to the longitudinal direction of the third side plate, and a pair of second sides perpendicular to the first side,
The first opening is configured such that the locking portion can be inserted into the first opening, and the length of the first side is longer than the distance between the outer surfaces of the pair of first side plates, and the length of the first side is longer than the distance between the outer surfaces of the pair of second sides. The length obtained by subtracting the thickness of the fourth side plate perpendicular to the third side plate from the length is longer than the length parallel to the longitudinal direction of the first side plate of the locking part, and The second side is formed to reach the outer surface of the fourth side plate,
The second notch is wider than the thickness of the fourth side plate of the second square pipe so that the fourth side plate can be inserted into the square pipe. Joint structure. The second square pipe is provided with a second opening having a rectangular shape in plan view in the fourth side plate,
The rectangle related to the second opening has a third side parallel to the longitudinal direction of the fourth side plate, and a pair of fourth sides perpendicular to the third side,
The second opening is configured such that the locking portion can be inserted into the second opening, the length of the third side is longer than the distance between the outer surfaces of the pair of first side plates, and the length of the third side is longer than the distance between the outer surfaces of the pair of first side plates. is equal to the length obtained by subtracting the length of the second notch from the length perpendicular to the longitudinal direction of the first side plate of the locking portion, and the fourth side is equal to the length of the third side plate of the locking portion. Claim 1 characterized in that the opening is formed to reach a side plate of the opening, and the pair of fourth sides form the same plane as the pair of second sides of the first opening. The square pipe joining structure according to any one of claims 1 to 3. A bolt insertion hole is provided in the fixing part of the first square pipe, and a bolt hole with a female thread formed on the inner peripheral surface is provided in the fourth side plate of the second square pipe,
When the fourth side plate is viewed in plan, the distance perpendicular to the third side plate from the outer surface of the third side plate to the center of the bolt hole is the distance of the second side plate on the side closer to the locking part. equal to the distance perpendicular to the second side plate from the outer surface of the side plate to the center of the bolt insertion hole, and from the side closer to the bolt hole of the pair of fourth sides to the center of the bolt hole. The distance parallel to the third side plate and the fourth side plate is equal to the distance parallel to the outer surface of the fixing part and the second side plate from the base end of the fixing part to the center of the bolt insertion hole. 5. The square pipe joining structure according to claim 4 . The square pipe joint according to claim 5, wherein the bolt insertion hole is an elongated hole having arcuate ends, and is elongated in parallel to the longitudinal direction of the first side plate. structure. It is characterized by comprising the square pipe joining structure according to any one of claims 1 to 6, and having a frame assembled by a plurality of the first square pipes and the second square pipes. transport container.

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