JP7410776B2 - How to close square tubes - Google Patents

Description

The present invention relates to a method for closing a square tube.

Patent Document 1 discloses a corner drop for water-stopping a waterway. The waterway to which this corner cutter is attached is open at the top, and grooves extending in the vertical direction are formed on both sides of the waterway. Then, the corner cutter is fitted into this groove, thereby closing the waterway and shutting off the water.

Japanese Patent Application Publication No. 2006-2996666

However, when the waterway is a rectangular tube having a closed space defined by a bottom surface, side surfaces, and a top surface, it has not been possible to close the entire rectangular tube by cutting the square tube. Conventionally, the only way to close off the entire rectangular pipe was to fill it with concrete, but using concrete had the problem of requiring time for curing. The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method for closing a square tube that can close the entire square tube in a short period of time.

A first method for closing a rectangular tube according to the present invention is a method for closing a rectangular tube having an internal space with a rectangular cross section defined by a bottom surface, a pair of side surfaces, and a top surface, the method comprising: on one side, fixing to each of the pair of side surfaces a one-side mounting member protruding from the side surface from the bottom surface to the top surface, the one-side mounting member being fixed to each of the pair of side surfaces in the axial direction; a first step having a surface facing toward the side; and a step of fixing a first other side attachment member extending from the bottom surface to a predetermined height to the other side of the one side attachment member on the pair of side surfaces of the square tube. The first other side mounting member has a surface that faces the surface of the one side mounting member at a predetermined distance, the second step, the one side mounting member, and the first other side mounting member. a third step of fitting at least one first closing member between the mounting members so as to be vertically aligned; and at least one second closing member to close the space above the first closing member; a fourth step of mounting the second closing member so as to face the surface of the one-side mounting member; 1 fixing a second other-side mounting member above the other-side mounting member, the second other-side mounting member having an opposing surface spaced apart from the surface of the one-side mounting member by a predetermined distance; and a fifth step.

In the first rectangular tube closing method, each of the one-side mounting member, the first other-side mounting member, and the second other-side mounting member is a plate-shaped fixing portion fixed to each side surface. and a planar plate-shaped protruding portion connected perpendicularly to the fixed portion, and each of the fixed portions is fixed to each side surface with an anchor bolt. It can be assumed that

In the first rectangular pipe closing method, haunches extending diagonally downward are formed on both sides of the upper surface, and the second other-side attachment member includes a first portion fixed to the haunches; and a second portion fixed below the corbel.

In the first method for closing a rectangular pipe, each of the first other side attachment members is constituted by a plurality of parts arranged in a vertical direction, and in the second step, each of the first other side attachment members after fixing the lower part of the first closing member corresponding to the lower part, fixing the upper part of each of the first other attachment members, and then fixing the upper part of each of the first other attachment members, The first closure member may be attached.

A second method for closing a rectangular tube according to the present invention is a method for closing a rectangular tube having an internal space with a rectangular cross section defined by a bottom surface, a pair of side surfaces, and a top surface, the method comprising: , a first step of attaching a mounting member having a U-shaped cross-sectional mounting portion extending from the bottom surface to a predetermined height, and attaching at least one first closing member above and below to each of the mounting portions of the mounting member on each side surface. a second step of fitting the square tube so that it is lined up in the direction; and fixing a one-side mounting member that protrudes from the side surface above the mounting member to each of the side surfaces on one side in the axial direction of the square tube. a third step, the one-side attachment member having a surface facing the other side in the axial direction; and at least one second closing member for closing a space above the first closing member. a fourth step of attaching the second closing member so as to face the surface of the one-side mounting member; and a fourth step of mounting the second closing member on each of the pair of side surfaces so as to sandwich both sides of the second closing member between the one-side mounting member and the one-side mounting member. A step of attaching the other mounting member to the other side in the axial direction above the mounting member, the other mounting member having a surface that faces the surface of the one mounting member at a predetermined distance. , a fifth step.

In the second rectangular tube closing method, haunches extending diagonally downward are formed on both sides of the upper surface, and the one side attachment member and the other side attachment member are each fixed to the haunches. It can include a first portion and a second portion fixed below the corbel.

According to the square tube closing method according to the present invention, the entire square tube can be closed in a short period of time.

It is a front view showing an example of a square tube. FIG. 3 is a perspective view showing an upstream mounting member and a downstream mounting member. FIG. 3 is a plan view of FIG. 2; FIG. 3 is a cross-sectional view and a front view of the lower closing plate. FIG. 3 is a cross-sectional view and a front view of the middle closing plate. FIG. 3 is a cross-sectional view and a front view of the upper closing plate. FIG. 3 is a plan view showing a state in which the closing plate is fixed to the upstream mounting member and the downstream mounting member. FIG. 3 is a front view showing a construction method for closing a square pipe. FIG. 3 is a front view showing a construction method for closing a square pipe. FIG. 3 is a front view showing a construction method for closing a square pipe. FIG. 3 is a front view showing a construction method for closing a square pipe. FIG. 3 is a front view showing a construction method for closing a square pipe. FIG. 3 is a front view showing a construction method for closing a square pipe. FIG. 3 is a front view showing a construction method for closing a square pipe. FIG. 3 is a front view showing a construction method for closing a square pipe. It is a perspective view of an attachment member. FIG. 17 is a front view showing a construction method for closing a square pipe using the attachment member of FIG. 16; FIG. 17 is a front view showing a construction method for closing a square pipe using the attachment member of FIG. 16; 17 is a plan view showing another example of the mounting member shown in FIG. 16. FIG.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the method for closing a square tube according to the present invention will be described with reference to the drawings. This rectangular pipe can be used for various purposes, such as water and sewage pipes, agricultural water pipes, and industrial water pipes.

<1. Overview of square tube>
FIG. 1 is a front view of the square tube viewed from the downstream side. Although the following description will be made in accordance with the direction shown in FIG. 1, the present invention is not limited to this direction.

As shown in FIG. 1, this square tube has an internal space 10 with a rectangular cross section defined by a bottom surface 11, a pair of side surfaces 12, and a top surface 14. The bottom surface 11 is curved so as to be convex downward. That is, it is curved so that the center in the horizontal direction is the lowest. Further, haunches 141 are formed on both sides of the upper surface 14 and extend diagonally toward each side surface 12 as they go downward.

Note that the material constituting the square tube is not particularly limited, but may be made of, for example, concrete.

<2. Mounting parts>
Next, the downstream mounting member and upstream mounting member attached to the side surface 12 of the square tube will be explained. In this embodiment, a plurality of downstream attachment members 2 and upstream attachment members 3 are fixed to the side surface 12 of the square tube, and the closure plates 5, 601 to 611 that close the square tube with the plurality of attachment members 2 and 3 are fixed to the side surface 12 of the square tube. , 7.

Below, first, the downstream attachment member 2 attached to the downstream side of a square tube will be explained. As shown in FIG. 2, the downstream mounting member 2 is attached to a rectangular plate-shaped fixing part 21 fixed to the side surface 12 of the square tube and perpendicular to the upstream end of this fixing part 21. A rectangular plate-shaped protrusion 22 is provided, and these are formed in an L-shape in plan view. Furthermore, two reinforcing members 23 are attached to the downstream attachment member 2 in the vertical direction. Each reinforcing member 23 is formed in a right-angled triangular shape, and each side sandwiching the right-angled corner is fixed to the fixing part 21 and the protruding part 22, respectively. These two reinforcing members 23 divide the downstream mounting member 2 into three regions in the vertical direction, and the three regions of the fixing portion 21 have mounting holes 211 through which the anchor bolts 4 are inserted. It is formed. Note that if reinforcing bars are incorporated into the square tube, the anchor bolt 4 may not be driven into the intended position. In preparation for this, the attachment hole 211 can be made into a long hole extending vertically or horizontally. Thereby, the anchor bolt 4 can be driven while being shifted vertically or horizontally.

In such a downstream mounting member 2, the length in the vertical direction, the number of reinforcing members 23, and the number of mounting holes 211 can be changed as appropriate depending on the requirements of the location where it is mounted. Further, as will be described later, a downstream haunch attachment member 201 is prepared in which the lower end of the protruding portion 22 is cut off diagonally for the corbel. Further, a downstream deformable attachment member 202 connected to the lower end of this downstream haunch attachment member 201 is also prepared. In this downstream side deformed attachment member 202, the upper end of the protrusion 22 is cut off diagonally.

The upstream mounting member 3 is formed in a symmetrical shape to the downstream mounting member 2, and similarly to the downstream mounting member 2, it has a fixing part 31, a protruding part 32, a reinforcing member 33, and a mounting hole 311. ing. That is, the protruding part 32 is connected to the downstream end of the fixed part 31 so as to store ore, and the reinforcing material 33 is fixed to the fixed part 31 and the protruding part 32.

Note that, similarly to the downstream mounting member 2, the length in the vertical direction, the number of reinforcing members 33, and the number of mounting holes 311 of the upstream mounting member 3 can be changed as appropriate depending on the requirements of the location where it is mounted. can. Furthermore, as will be described later, an upstream haunch attachment member 301 is prepared in which the lower end of the protruding portion 32 is cut off diagonally for the corbel. Moreover, an upstream deformable attachment member 302 connected to the lower end of this upstream haunch attachment member 301 is also prepared. In this upstream side deformed attachment member 302, the upper end of the protrusion 32 is cut off diagonally.

As shown in FIG. 3, the downstream mounting member 2 and upstream mounting member 3 formed in this way are attached to the side surface of the square tube by anchor bolts 4 inserted into the mounting holes 211, 311 of the fixing parts 21, 31. It is fixed at 12. Furthermore, the protruding part 22 of the downstream mounting member 2 and the protruding part 32 of the upstream mounting member 3 are arranged at a predetermined interval, and the closing plates 5, 601 to 611, 7, which will be described next, are arranged between them. Fitted in.

<3. Closing plate＞
In this embodiment, as an example, three types of closure plates are used. That is, one lower stage closing plate 5, eleven middle stage closing plates 601 to 611, and one upper stage closing plate 7 are used. As shown in FIG. 4, the lower closing plate 5 is arranged so as to be in contact with the bottom surface 11 of the square tube, and is curved so that the lower end thereof is convex downward along the bottom surface 11. . Two U-shaped handles 51 are attached to the lower closing plate 5 at a predetermined interval in the horizontal direction. Further, band-shaped water stop rubber 52 is attached to both ends of the upstream side. On the other hand, wedge members 53 are attached to both ends of the downstream surface, the height of which protrudes from the lower closing plate 5 decreasing toward both ends.

This lower stage closing plate 5 is fixed between the downstream mounting member 2 and the upstream mounting member 3, as shown in FIG. That is, the water stop rubber 52 of the lower closing plate 5 comes into contact with the downstream surface (plane) of the protrusion 32 of the upstream mounting member 3, increasing the water stop effect. Further, the wedge member 53 of the lower closing plate 5 is fitted into the gap between the lower closing plate 5 and the upstream surface (plane) of the protrusion 22 of the downstream attachment member 2. Therefore, the lower closing plate 5 is firmly fixed between the mounting members 2 and 3 due to the wedge effect. The above fixing mechanism is the same for the middle closing plates 601 to 611 and the upper closing plate 7.

As shown in FIG. 5, the middle closing plates 601 to 611 are formed into a rectangular shape in plan view, and like the lower closing plate 5, two handles 61 are attached. In addition, a band-shaped water stop rubber 62 similar to the lower closing plate 5 is attached to both ends of the upstream side, and a wedge member 63 similar to the lower closing plate 5 is attached to both ends of the downstream side. are attached to each. Further, hereinafter, for convenience of explanation, the middle-stage closing plates stacked from the bottom to the top will be referred to as first to eleventh middle-stage closing plates 601 to 602, respectively.

As shown in FIG. 6, the upper stage closing plate 7 is attached to the uppermost stage and is formed into a pentagonal shape in plan view. That is, obliquely inclined corner portions 75 are formed at both ends of the upper side so as to correspond to the upper surface 14 including the haunch 141 of the square tube. Further, the upper closing plate 7 is formed into a rectangular shape in plan view, and similarly to the lower closing plate 5, two handles 71 are attached. In addition, a band-shaped water stop rubber 72 similar to the lower closing plate 5 is attached to both ends of the upstream side, and a wedge member 73 similar to the lower closing plate 5 is attached to both ends of the downstream side. are attached to each. However, the water stop rubber 72 is formed to extend diagonally along the corner 75 that extends diagonally.

<4. Construction method for closing square pipes＞
Next, a construction method for closing a square pipe with the closing plates 5, 601 to 611, 7 will be explained with reference to FIGS. 8 to 15.

First, as shown in FIG. 8, upstream mounting members 3 are fixed to both side surfaces 12 of a square tube. In this example, two upstream mounting members 3 are fixed from the bottom. One upstream deformable mounting member 302 is fixed thereon. This upstream side deformable attachment member 302 is attached so as to extend to the lower end of the haunch 141. One upstream haunch mounting member 301 is fixed to the haunch 141. The lower end of the protrusion of the upstream haunch attachment member 301 extends obliquely, and this is in contact with the upper end of the protrusion of the upstream deformable attachment member 302. Therefore, over the entire length of the side surface 12 and the corbel 141, these upstream attachment members 3, 301, 302 form a flat wall facing downstream.

The installation of the downstream mounting member 2 and the closing plates 5, 601 to 611, 7 will be described below, but for the convenience of explanation, the upstream mounting members 3, 301, 302 are omitted in FIGS. 9 to 15. There is.

Next, as shown in FIG. 9, one downstream attachment member 2 is fixed to each of both side surfaces 12 so as to extend from the lower end. As a result, gaps for the lower closing plate 5 and the first to third middle closing plates 601 to 603 are formed between the downstream attachment member 2 and the upstream attachment member. Subsequently, as shown in FIG. 10, the lower closing plate 5 and the first to third middle closing plates 601 to 603 are fitted into this gap from above in this order.

Subsequently, as shown in FIG. 11, the downstream mounting members 2 are further fixed one by one onto the previously mounted downstream mounting members 2. Then, the fourth to ninth middle stage closing plates 604 to 609 are fitted into the gaps between the fixed downstream mounting member 2 and the upstream mounting member 3 from above. In this state, there remains space above the ninth middle closing plate 609 in which two further middle closing plates 610 and 611 and the upper closing plate 7 are attached.

Next, as shown in FIG. 12, three anchor bolts 41 to 43 are fixed on each side surface 12 above the already fixed downstream mounting member 2. Here, these three anchor bolts will be referred to as first, second, and third anchor bolts 41, 42, and 43 from the top. First, the distance in the vertical direction between the ninth middle-stage closing plate 609 at the top and the third anchor bolt 43 is made smaller than the height in the vertical direction of the middle-stage closing plates 601 to 611. Further, the vertical gap between the second and third anchor bolts 42 and 43 is made narrower than the vertical height of the middle closing plates 601 to 611. The gap between the first and second anchor bolts 41 and 42 is made wider than the height of the middle closing plates 601 to 611 in the vertical direction.

Next, as shown in FIG. 14, the two middle closing plates 610 and 611 and the upper closing plate 7 are attached on the ninth middle closing plate 609. First, the tenth intermediate closing plate 610 is inserted through the gap between the first and second anchor bolts 41 and 42, moved downward, and placed on the upper end of the ninth intermediate closing plate 609. Since the tenth middle stage closing plate 610 is supported by the second and third anchor bolts 42 and 43, it does not fall down to the downstream side. Next, the eleventh intermediate closing plate 611 is inserted through the gap between the first and second anchor bolts 41 and 42, and is pressed against the upstream deformable attachment member 302 by being supported by an operator or the like. Furthermore, the upper stage closing plate 7 is fitted from above the first anchor bolt 41 and is pressed against the upstream haunch mounting member 301 by being supported by an operator or the like. In this state, the downstream deformable attachment member 202 is fixed to the first to third anchor bolts 41 to 43. As a result, the eleventh intermediate closing plate 611 is fixed between the upstream deformable attachment member 302 and the downstream deformable attachment member 202.

Finally, as shown in FIG. 15, the anchor bolt 44 is fixed to the corbel 141, and then the downstream corbel mounting member 201 is fixed to the anchor bolt 44. Thereby, the upper closing plate 7 is fixed between the upstream haunch attachment member 301 and the downstream haunch attachment member 201. In this way, all the closing plates 5,601 to 611,7 are attached and the square tube is closed.

<5. Features＞
As described above, according to the square tube closing method according to the present embodiment, the upstream mounting member 3 is first fixed, and then the downstream mounting members 2, 201, 202 are fixed, and the closing plates 5, 601 to By alternately attaching the plates 611, 7, all the closing plates 5, 601 to 611, 7 for closing the entire rectangular tube can be attached. Therefore, for example, the entire square pipe can be closed in a shorter period of time than by burying the square pipe with concrete or the like.

In this embodiment, the upstream mounting member 3, the upstream modified mounting member 302, and the upstream haunch mounting member 301 correspond to the one-side mounting member of the present invention. Further, the downstream deformed attachment member 202 and the downstream haunch attachment member 201 correspond to the second other side attachment member of the present invention, and the other downstream attachment members 2 correspond to the first other side attachment member of the present invention. corresponds to Further, the lower closing plate 5 and the first to ninth middle closing plates 601 to 609 correspond to the first closing member of the present invention, and the tenth and eleventh middle closing plates 610, 611 and the upper closing plate 7 correspond to the first closing member of the present invention. This corresponds to the first closing member of the invention.

<6. Modified example>
Although one embodiment of the present invention has been described above, the present invention is not limited to this, and various changes can be made without departing from the spirit thereof. Note that the following modifications can be combined as appropriate.

<6-1>
In the above embodiment, after attaching the two downstream mounting members 2, the lower closing plate 5 and the first to ninth middle closing plates 601 to 609, the tenth and eleventh middle closing plates 610, 611 and the upper closing plate 5 are attached. Although the plate 7 is arranged to face the upstream mounting members 301 and 302, and then the downstream deformed mounting member 202 and the downstream corbel mounting member 201 are fixed, the construction method is limited to this. It's not a thing.

First, in the above embodiment, the closing plates 5, 601 to 609 are fitted into the gaps between the upstream mounting member 3 and the downstream mounting member 2, which are already fixed. The number of side attachment members 2 and closing plates 5, 601 to 609 is not particularly limited. Further, the upstream mounting member 3 and the downstream mounting member 2 used at this time may have the same or different lengths in the vertical direction. This also applies to the middle closing plates 5, 601 to 609.

Next, in the above embodiment, the tenth and eleventh intermediate closing plates 610, 611 and the upper closing plate 7 are arranged to face the upstream mounting members 301, 302, and then the downstream deformable mounting members 202 and the downstream Although the side corbel attachment member 201 is fixed, the number of closing plates disposed at this time is not limited, and closing plates of different shapes may be used in combination. Furthermore, in the above embodiment, the downstream deformable attachment member 202 and the downstream haunch attachment member 201 are finally fixed to the side surface 12, but the number and shape of the downstream attachment members used at this time are also not particularly limited. First, it is only necessary that the disposed closing plate can be sandwiched between the upstream mounting member 3 and the upstream mounting member 3.

<6-2>
The shapes of the downstream mounting member 2 and the upstream mounting member 3 are not particularly limited, as long as they can be fixed to at least the side surface and both mounting members 2 and 3 have a flat surface that contacts the closure plate. Moreover, these attachment members 2 and 3 may be fixed to the side surface 12 by a method other than the anchor bolt 4.

<6-3>
The form of the closing plates 5, 601 to 611, 7 is not particularly limited, and any form may be used as long as the square tube can be closed by a plurality of closing plates. Therefore, the shape of each closing plate is not particularly limited, and the shape and presence or absence of the handle, the shape and presence of the water stop rubber, and the shape and presence of the wedge member can be changed as appropriate. Further, the closing plate can also be shaped into a block shape other than a plate shape.

<6-4>
Although the rectangular tube of the above embodiment has a haunch 141 formed on the upper surface 14, it is also applicable to a rectangular tube without a haunch 141. For square pipes without corbels 141, the downstream deformed attachment member 202 and the downstream haunch attachment member 201 are no longer necessary, and, for example, the downstream attachment member 2 and the upstream attachment member 3, which differ only in length, can be used. Can be used. Further, it is naturally applicable to a rectangular tube with a flat bottom surface 11 without any curvature.

<6-5>
In the embodiment described above, the downstream mounting member 2 is attached after the upstream mounting member 3 is attached, but this may be reversed. That is, after the downstream mounting member 2 is installed over the entire side surface 12, the upstream mounting member 3, 301, 302 and the closing plates 5,601 to 611, 7 can be installed alternately. .

<6-6>
In the above embodiment, the upstream mounting member 3 and the downstream mounting member 2 are arranged, and the closing plate is arranged between them. For example, as shown in FIG. It is also possible to use the mounting member 8 in combination with the member 2. This mounting member 8 has a fixing part 31 of the upstream mounting member 3 and a fixing part 21 of the downstream mounting member 2 fixed by a plate-shaped connecting part 25, and is provided between the two protruding parts 22 and 32. Place the closure plate. These two protruding parts 22, 32 and the connecting part 25 constitute the attachment part of the present invention.

In this case, for example, as shown in FIG. 17, a plurality of attachment members 8 are attached to each side surface 12 to a predetermined height below the corbel 141. Next, the lower closing plate 5 and the first to ninth middle closing plates 601 to 609 are attached to the attachment member 8. Subsequently, as shown in FIG. 18, the above-described upstream side deformed attachment member 302 and upstream haunch attachment member 301 are respectively fixed above the uppermost attachment member 8. After that, the tenth and eleventh intermediate closing plates 610, 611, the upper closing plate 7, the downstream deformable attachment member 202, and the downstream corbel attachment member 201 are attached in the same steps as in FIGS. 13 to 15 described above. For example, the square tube is closed. Note that in the steps shown in FIGS. 13 to 15, the attachment member can also be fixed from the downstream side.

The configuration of the mounting member is not particularly limited, and it is sufficient that it has at least a fixing portion that is fixed to the side surface and a pair of protrusions on which the closing plate is arranged. For example, as shown in FIG. 19, the mounting member 8 can be formed into a U-shaped cross section, including a pair of plate-shaped protrusions 202 and 203 and a connecting portion 201 that connects them. (forms the mounting area). In this case, the connecting part 201 can be fixed to the side surface 12 with the anchor bolt 4, and the closing plate 5 can be arranged between the pair of protruding parts 202, 203.

11 Bottom surface 12 Side surface 14 Top surface 141 Haunch 2 Downstream side mounting member (first other side mounting member)
201 Downstream haunch mounting member (second other side mounting member)
202 Downstream side deformed attachment member (second other side attachment member)
3 Upstream side mounting member (one side mounting member)
4 Anchor bolt 5 Lower closing plate (first closing member)
601 to 609 1st to 9th middle closing plate (first closing member)
610, 611 10th, 11th middle closing plate (second closing member)
7 Upper closing plate (second closing member)
8 Mounting parts

Claims (6)

A method for closing a square tube having an internal space with a rectangular cross section defined by a bottom surface, a pair of side surfaces, and a top surface, the method comprising:
a step of fixing a one-side mounting member protruding from the side surface from the bottom surface to the top surface to each of the pair of side surfaces on one side in the axial direction of the square tube, the one-side mounting member a first step having a surface facing the other side in the axial direction;
fixing a first other side attachment member extending from the bottom surface to a predetermined height to the other side of the one side attachment member on the pair of side surfaces of the square tube, the first other side attachment member being fixed to the other side of the one side attachment member; , a second step having a surface facing the surface of the one-side mounting member at a predetermined distance;
a third step of fitting at least one first closing member between the one side attachment member and the first other side attachment member so as to be vertically aligned;
a fourth step of attaching at least one second closure member so as to face the surface of the one side attachment member to close a space above the first closure member;
fixing a second other-side attachment member above the first other-side attachment member on each of the pair of side surfaces so that both sides of the second closing member are sandwiched between the one-side attachment member; a fifth step, wherein the second other-side mounting member has a surface that faces the surface of the one-side mounting member with a predetermined distance therebetween;
A method for closing square tubes. The one-side mounting member, the first other-side mounting member, and the second other-side mounting member are each connected to a plate-shaped fixing portion fixed to each side surface and perpendicular to the fixing portion. , a plate-like protrusion portion having a flat surface , and an L-shape,
The method for closing a rectangular tube according to claim 1, wherein each of the fixed portions is fixed to each of the side surfaces with an anchor bolt. Corbels extending diagonally downward are formed on both sides of the upper surface, and
The square tube according to claim 1 or 2, wherein the second other side attachment member includes a first portion fixed to the corbel and a second portion fixed below the corbel. Closing method. Each of the first other side mounting members is composed of a plurality of parts arranged in the vertical direction,
In the second step,
After fixing the lower part of each of the first other side attachment members and attaching the first closing member corresponding to the lower part, fixing the upper part of each of the first other side attachment members, and then 4. The method for closing a rectangular tube according to claim 1, wherein the first closing member corresponding to the upper portion is attached. A method for closing a square tube having an internal space with a rectangular cross section defined by a bottom surface, a pair of side surfaces, and a top surface, the method comprising:
a first step of attaching a mounting member having a U-shaped cross-sectional mounting portion extending from the bottom surface to a predetermined height to each of the pair of side surfaces;
a second step of fitting at least one first closing member into each of the attachment portions of the attachment member on each of the side surfaces so as to be vertically aligned;
fixing to each of the side surfaces on one axial side of the square tube a one-side mounting member that protrudes from the side surface above the mounting member, the one-side mounting member a third step having a surface facing the other axial side;
a fourth step of attaching at least one second closure member so as to face the surface of the one side attachment member to close a space above the first closure member;
Attaching the other side attachment member to the other side in the axial direction above the attachment member on each of the pair of side surfaces so that both sides of the second closing member are sandwiched between the one side attachment member and the one side attachment member. a fifth step, wherein the other mounting member has a surface that faces the surface of the one mounting member at a predetermined distance;
A method for closing square tubes. Corbels extending diagonally downward are formed on both sides of the upper surface, and
The one-side mounting member and the other-side mounting member each include a first portion fixed to the corbel and a second portion fixed below the corbel. How to close square tubes.