JP7520702B2 - Earth retaining structure construction tool and earth retaining structure construction method - Google Patents

Description

The present invention relates to a retaining structure construction jig for constructing an earth retaining structure and a method for constructing an earth retaining structure using the same.

Traditionally, soil-retaining structures such as shafts for constructing the foundations of structures, underground collection wells, and sloped retaining walls are constructed by installing soil-retaining members (also called liner plates) made of, for example, corrugated steel plates to hold back the ground, and connecting multiple soil-retaining members to form a ring-shaped or horseshoe-shaped (U-shaped) soil-retaining structure.

When constructing a shaft using the above-mentioned earth retaining structure, multiple earth retaining members are connected from top to bottom along the wall of the shaft as the shaft is dug down to form the earth retaining structure. The edges of the earth retaining members are surrounded by flanges and have multiple holes formed therein. For example, the earth retaining structure forms a top-level ring-shaped body composed of multiple earth retaining members connected in a ring shape to cover the inner wall of an excavated hole formed by shallowly digging the ground surface. After that, further earth retaining members are connected below the installed earth retaining members, and the ground surface is further dug down while the members are successively connected to cover the inner wall of the excavated hole. The multiple earth retaining members of such an earth retaining structure are made of corrugated steel plates, etc., and each of them is lightweight, which has the advantage of being easy to construct even in mountainous areas where large heavy machinery cannot be used (see, for example, Patent Document 1).

JP 2002-295170 A

However, when constructing the earth retaining structure disclosed in Patent Document 1, it is necessary to pass a bolt through a hole and fasten the bolt and nut when butting and joining the flanges together. The work of passing the bolt through the hole and screwing the nut onto the bolt to fasten them is done by hand by a worker while holding the flanges of the earth retaining members in an butted state. At this time, the worker needs to support the earth retaining member with one hand, so he cannot use both hands to install the bolt and nut, which makes the work difficult.

In addition, in order for workers to install the bolts and nuts, they had to hoist or jack up the retaining members, or the work had to be done by multiple workers. This posed a problem in that it was difficult to install the retaining structure in mountainous areas where heavy machinery could not be brought in, or when the inner diameter of the shaft was small.

The present invention aims to solve the above problems and provide a retaining structure construction jig and a retaining structure construction method that make it easier to build the retaining structure.

The earth retaining structure construction jig according to the present invention is a retaining structure construction jig that holds flange portions formed at the ends of a plurality of earth retaining members in a stacked state,
A main body portion,
A plurality of holding portions extending from the main body portion in directions intersecting each other,
The plurality of holding portions include
The distal ends are disposed at a predetermined interval in a first direction along the distal end edge of the flange portion,
a first arm portion and a second arm portion arranged in parallel along a second direction that is a direction perpendicular to the first direction;
The first arm and the second arm are
The two flange portions are arranged side by side with a gap of a width allowing free insertion.

The method for constructing an earth retaining structure according to the present invention is a method for constructing an earth retaining structure using the above-mentioned earth retaining structure construction jig,
A lower flange portion formed at the lower end of a first earth retaining member constituting an earth retaining structure and an upper flange portion formed at the upper end of a second earth retaining member located below the first earth retaining member and connected to the first earth retaining member are overlapped,
The method includes a temporary fixing process for inserting the lower flange portion and the upper flange portion between the first retaining portion and the second retaining portion of the retaining structure construction jig.

According to the present invention, the flange portions of the retaining members can be temporarily fixed in a butted state by simply inserting the flange portions of the retaining members into the gap between the first and second arms of the retaining structure construction jig. While holding the retaining members, the worker can easily fit the retaining structure construction jig into the flange portions and temporarily fix them. This allows the worker to easily perform the work of connecting using connecting members such as bolts and nuts.

1 is an oblique view of an earth retaining structure 100 according to embodiment 1. FIG. 1 is a plan view and a side view of an earth retaining structure 100 according to embodiment 1. An oblique view of an example of an earth retaining member 50 constituting an earth retaining structure 100 relating to embodiment 1. FIG. 3 is an enlarged schematic view of part B in FIG. 1 is a three-sided view of a retaining structure construction jig 10 according to embodiment 1. FIG. This is a side view of the state in which the retaining structure construction jig 10 of embodiment 1 is fitted into the retaining structure 100. FIG. 7 is a front view of FIG. 6 . FIG. 7 is a top view of FIG. 6 . This is a three-sided view of a retaining structure construction jig 10a, which is a modified example of the retaining structure construction jig 10 of embodiment 1. FIG. 10 is an exploded view of the retaining structure construction jig 10a of FIG. This is a side view of the state in which the retaining structure construction jig 10a of embodiment 1 is fitted into the retaining structure 100. FIG. 12 is a front view of FIG. FIG. 12 is a top view of FIG. 13 is a top view and a side view of a retaining structure construction jig 210 relating to embodiment 2. FIG. This is a plan view of a retaining structure construction jig 210 of embodiment 2 attached to a retaining member 50. A three-sided view of a retaining structure construction jig 310 relating to embodiment 3. This is a side view of the state in which a retaining structure construction jig 310 relating to embodiment 3 is fitted into the retaining structure 100. FIG. 18 is a front view of FIG. 17 . FIG. 17 is a top view of FIG. This is a plan view of the state in which a retaining structure construction jig 310a, which is a modified example of the retaining structure construction jig 310 relating to embodiment 3, is fitted into the retaining structure 100.

The following describes the retaining structure construction jig and retaining structure construction method according to the embodiment with reference to the drawings. Note that in the following drawings, including FIG. 1, the relative dimensional relationships and shapes of the components may differ from the actual ones. In the following drawings, the same reference numerals are used to denote the same or equivalent objects, and this applies throughout the entire specification. In addition, to facilitate understanding, directional terms (e.g., up, down, left, right, front, back, front and back, etc.) are used as appropriate, but these notations are for the convenience of explanation and do not limit the arrangement, direction or orientation of devices, instruments, parts, etc.

Embodiment 1.
(Earth retaining structure 100)
FIG. 1 is a perspective view of an earth retaining structure 100 according to the first embodiment. FIG. 2 is a plan view (a) and a side view (b) of the earth retaining structure 100 according to the first embodiment. FIG. 3 is a perspective view of an example of an earth retaining member 50 constituting the earth retaining structure 100 according to the first embodiment. The earth retaining structure 100 constructed using the earth retaining structure construction jig 10 will be described with reference to FIGS. 1 to 3. The earth retaining structure 100 is, for example, a civil engineering structure such as a vertical shaft for constructing the foundation of a structure or a drainage well constructed in the ground, and is constructed in a vertical hole 90 formed by excavating the ground 92. In FIG. 1, the earth retaining structure 100 is formed in a ring shape by connecting a plurality of earth retaining members 50, but is not limited to the shape shown in FIG. 1. For example, the earth retaining structure 100 may be formed in a circular, elliptical, oval, rectangular, or horseshoe (U-shaped) shape.

The earth retaining structure 100 is constructed by first placing an annular body 70A in a vertical hole 90 formed by shallowly excavating the ground 92, and then forming another annular body 70B below the annular body 70A as the vertical hole 90 is excavated, so that it extends downward. The annular bodies 70A and 70B are connected by attaching a connecting member 60 to a circumferential connecting portion 81 formed by butting together the vertical flange portions 53 formed on the longitudinal edges of the multiple earth retaining members 50. The connecting member 60 may be, for example, a bolt and nut, or a clip-shaped metal fitting that clamps the flanges to connect them.

As shown in FIG. 3, the retaining member 50 has a lower flange portion 51a, an upper flange portion 51b, and vertical flange portions 53a and 53b at the end edge of the corrugated portion 50a. The end edges of the lower flange portion 51a and the upper flange portion 51b extend in the θ direction and have a surface perpendicular to the z direction. The vertical flange portions 53a and 53b extend in the z direction and have a surface perpendicular to the θ direction. The lower flange portion 51a and the upper flange portion 51b are collectively referred to as the horizontal flange portion 51. The vertical flange portions 53a and 53b may be collectively referred to as the vertical flange portion 53. The horizontal flange portion 51 and the vertical flange portion 53 may be collectively referred to as the flange portion. The θ direction may also be referred to as the first direction, and the z direction may also be referred to as the second direction.

In FIG. 3, the corrugated portion 50a has a rectangular wave-like cross-sectional shape, but it may be formed into a sine curve or another shape. In particular, a corrugated portion 50a formed into a sine curve may be called a liner plate.

The upper flange portion 51b of the retaining member 50 has a plurality of holes 55 formed therein. The holes 55 penetrate the upper flange portion 51b in the z direction and are provided at equal intervals in the θ direction. The lower flange portion 51a also has a plurality of holes 55 formed therein, similar to the upper flange portion 51b, and is butted against the upper flange portion 51b of another retaining member 50. The lower flange portion 51a and the upper flange portion 51b are connected by inserting a connecting member 60 (see FIG. 8) through the lower flange portion 51a and the upper flange portion 51b with the holes 55 aligned with each other.

Vertical flange portions 53 are formed on both ends of the retaining member 50 in the θ direction, and holes 54 are formed in each. The holes 54 are provided to match the shape of the corrugated portion 50a, and are configured so that a connecting member 60 can be inserted from the inside when the retaining member 50 is installed in the vertical hole 90. The retaining members 50 are connected by inserting the connecting member 60 into the holes 54 with the vertical flange portion 53a butting against the vertical flange portion 53b of another retaining member.

Figure 4 is a schematic diagram of an enlarged portion B in Figure 2 (b). A method of constructing annular body 70B below annular body 70A in Figure 4 will be described. After annular body 70A is fixed to the upper structure, an upper flange portion 51b formed at the upper end of retaining member 50B is butted against a lower flange portion 51a formed at the lower end of retaining member 50A constituting annular body 70A. The holes 55 formed in the lower flange portion 51a of retaining member 50A and the holes 55 in the upper flange portion 51b of retaining member 50B are aligned and temporarily fixed. In addition, retaining member 50C is arranged adjacent to retaining member 50B in the circumferential direction (θ direction) of retaining structure 100, and the upper flange portion 51b of retaining member 50C is also butted against the lower flange portion 51a of retaining member 50A, and the holes 55 are aligned and temporarily fixed. Furthermore, the vertical flange portion 53a of the soil retaining member 50B and the vertical flange portion 53b of the soil retaining member 50C are butted together in the θ direction and temporarily fixed. In the first embodiment, when temporarily fixing the soil retaining members 50B and 50C below the soil retaining member 50A, they are temporarily fixed using the soil retaining structure construction jig 10 described later.

Retaining members 50B and 50C are connected adjacent to each other in the circumferential direction of retaining member 50A of ring-shaped body 70A. Retaining member 50B, which is temporarily fixed below retaining member 50A, is also temporarily fixed to retaining member 50C constituting ring-shaped body 70A. Retaining member 50C, which is temporarily fixed below retaining member 50A, is also temporarily fixed to retaining member 50B constituting ring-shaped body 70A. Retaining members 50B and 50C, which are temporarily fixed below ring-shaped body 70A, are connected in the vertical and circumferential directions using connecting members 60.

The annular body 70A and the annular body 70B are connected in the vertical direction, and the circumferential connecting portion 81 of the annular body 70A and the circumferential connecting portion 81 of the annular body 70B connected to the lower part of the annular body 70A are arranged in a shifted circumferential direction of the earth retaining structure 100 (θ direction in FIG. 2(a)). In other words, the circumferential connecting portion 81 of the annular body 70B is connected to the lower part of the middle part of the multiple earth retaining members 50 constituting the annular body 70A. By arranging the circumferential connecting portion 81 for each annular body 70 in a shifted manner, the earth retaining structure 100 has equal strength and rigidity in each part in the circumferential direction. However, the amount by which the multiple earth retaining members 50 arranged vertically are shifted in the θ direction is not limited to half the length in the θ direction, and can also be shifted by the pitch of the multiple holes 55 provided in the horizontal flange portion 51. For example, the retaining member 50 in FIG. 3 has ten holes 55 formed in the horizontal flange portion 51, but the holes 55 of the lower retaining member 50A may be connected to the upper retaining member 50A by shifting them by 1 to 5 pitches.

(Earth retaining structure construction jig 10)
5 is a three-view diagram of the retaining structure construction jig 10 according to the first embodiment. FIG. 5(a) is a front view of the retaining structure construction jig 10, FIG. 5(b) is a side view, and FIG. 5(c) is a plan view. The retaining structure construction jig 10 has a retaining portion 11 extending in two directions from a main body portion 12, and a slit 20 is formed from a tip 14 of each retaining portion 11 toward the main body portion 12. The slit 20 is formed to a width that allows the horizontal flange portions 51 of the upper and lower retaining members 50 to be freely inserted in a state where they are overlapped. Note that one retaining portion extending from the main body portion 12 may be referred to as a first retaining portion, and the other as a second retaining portion.

The multiple retaining parts 11 extend from the main body 12 so as to be mutually orthogonal. The angle formed by the multiple retaining parts 11 is not limited to a right angle, and may be an angle smaller than a right angle, a larger angle, or parallel, as long as the distance between the tips 14 in the x direction is a predetermined width. However, the multiple retaining parts 11 must extend in one direction as viewed from the main body 12, that is, in the y direction in FIG. 5(c). The x direction is the width direction of the retaining structure construction jig 10, and the tips of the multiple retaining parts 11 are spaced apart at least in this direction. The y direction is the direction from the main body 12 toward the tips of the multiple retaining parts 11. The z direction is perpendicular to the x and y directions, and is the direction in which the main body 12 extends.

Each of the multiple holding parts 11 is composed of arm part 16a and arm part 16b. As shown in FIG. 5(c), arm part 16a and arm part 16b are arranged in parallel along the z direction. Arm part 16a has holding surface 13a on the side where arm part 16b is arranged. Arm part 16b has holding surface 13b facing holding surface 13a. Holding surface 13a and holding surface 13b are surfaces facing the z direction and the opposite direction of the z direction, and form a slit 20. Arm part 16a may be referred to as the first arm, and arm part 16b may be referred to as the second arm.

The main body 12 is a portion that connects the multiple retaining parts 11. The main body 12 also has a connection surface 15 that connects the retaining surfaces 13a and 13b. The slit 20 is a notch formed in the multiple retaining parts 11, and is formed by the retaining surfaces 13a, 13b, and the connection surface 15. The opposing retaining surfaces 13 form a gap into which the horizontal flange portions 51 of the retaining members 50 that make up the retaining structure 100 can be freely inserted when they are overlapped.

Figure 6 is a side view of the state in which the retaining structure construction jig 10 according to embodiment 1 is fitted into the retaining structure 100. Figure 7 is a front view of Figure 6. Figure 8 is a top view of Figure 6. The retaining structure construction jig 10 according to embodiment 1 is fitted into the vertical connecting portion 82 of the retaining structure 100 in Figure 4 or the cross connecting portion 83 where the vertical connecting portion 82 and the circumferential connecting portion 81 intersect. Figures 6 to 8 show the state in which the retaining structure construction jig 10 is fitted into the cross connecting portion 83 of the retaining structure 100 shown in Figure 4. The cross connecting portion 83 is the portion where the vertical connecting portion 82, in which the lower flange portion 51a of the retaining member 50A is butted against the upper flange portions 51b of the retaining members 50B and 50C, intersects with the vertical connecting portion 81, in which the vertical flange portions 53a and 53b of the retaining members 50B and 50C are butted against each other. The retaining structure construction jig 10 is installed so that the x direction shown in FIG. 5 is aligned with the θ direction of the retaining structure 100 shown in FIG. 8.

The retaining structure construction jig 10 is attached to at least two points of the retaining members 50 to be connected, temporarily fixing the retaining members 50 to the lower flange 51a of the upper retaining member 50. As shown in Figures 7 and 8, the retaining structure construction jig 10 fitted into the cross connection portion 83 can simultaneously hold the circumferentially adjacent retaining members 50B and 50C and temporarily fix them to the upper retaining member 50A.

6 and 7, the two horizontal flanges 51 inserted into the slit 20 are held between the holding surface 13a of the arm 16a and the holding surface 13b of the arm 16b in a butted state. In the first embodiment, the distance between the holding surface 13a and the holding surface 13b is set to be equal to or greater than the combined thickness of the lower flange 51a and the upper flange 51b. The holding surfaces 13a and 13b are arranged parallel to each other, but this is not limited thereto. The distance between the holding surfaces 13a and 13b may be set so that the tip side is larger than the base side, which is the side where the main body 12 is arranged. In this case, the distance between the holding surfaces 13a and 13b may be set so that the tip side is larger than the thickness of the overlapped flanges and the base side is smaller than the thickness of the overlapped flanges. In addition, as described later, a chamfer 21 (see FIG. 9) may be formed at the tip of the slit 20.

As shown in FIG. 8, the retaining structure construction jig 10 is installed with the x-direction shown in FIG. 5 aligned with the θ-direction of the retaining structure 100. The tips 14 of the retaining parts 11 of the retaining structure construction jig 10 are arranged with a predetermined interval H between them, and the vertical flange parts 53a and 53b can be inserted between the multiple retaining parts 11 in an overlapping state. In other words, the opposing flat surfaces 18 of the retaining parts 11 are arranged so that the tip 14 side is spaced apart by the interval H. In addition, the flat surfaces 18 are configured to have an interval H1 on the main body 12 side, and the interval H1 is formed so that at least two vertical flange parts 53a and 53b can be inserted in an overlapping state. As a result, the retaining structure construction jig 10 can be arranged to straddle two retaining members 50B and 50C adjacent to each other in the circumferential direction (θ direction), and the two retaining members 50B and 50C can be temporarily fixed to the retaining member 50A at the same time. In addition, the retaining members 50B and 50C are held in a position where the connecting member 60 can be attached without the need for lifting with heavy machinery or support with a jack by fitting the retaining structure construction jig 10 into the other ends other than the ends shown in FIG. 8. The flat surface 18 of the retaining structure construction jig 10 is also referred to as the inner surface.

As shown in FIG. 8, in a state where the retaining member 50A is temporarily fixed by the retaining structure construction jig 10, the connecting member 60 is inserted into the hole 55, and the retaining member 50A is connected to the retaining members 50B and 50C. The connecting member 60 has an insertion portion 61 at its tip and is configured to engage with the flange portions, and the other end is formed in a clip shape and configured to clamp the overlapping flange portions. However, the connecting member 60 is not limited to the clip type shown in FIG. 8, and bolts and nuts may also be used.

In Figures 6 to 8, the retaining structure construction jig 10 is fitted into the cross connection portion 83 of the retaining structure 100, but it can also be fitted into the vertical connection portion 82.

As described above, the method for constructing an earth retaining structure according to the first embodiment includes a temporary fastening process using the earth retaining structure construction jig 10. In the temporary fastening process, the lower flange portion 51a formed at the lower end of the first earth retaining member 50A constituting the earth retaining structure 100 and the upper flange portion 51b formed at the upper end of the second earth retaining member 50B located below the first earth retaining member 50A and connected to the first earth retaining member 50A are placed in an overlapping state. Then, the lower flange portion 51a and the upper flange portion 51b are inserted between the first retaining surface 13a and the second retaining surface 13b of the earth retaining structure construction jig 10.

The temporary fastening process overlaps the upper flange portion 51b formed at the upper end of the third retaining member 50C, which is located below the first retaining member 50A and to the side of the second retaining member 50B and is connected to the first retaining member 50A, with the lower flange portion 51a of the first retaining member 50A.Then, the vertical flange portions 53 formed at the horizontal ends of the second retaining member 50B and the third retaining member 50C are overlapped, and the vertical flange portions 53 are inserted between the multiple retaining portions 11.

Once the temporary fastening process is complete, the worker connects the flanges of the first retaining member 50A, the second retaining member 50B, and the third retaining member 50C together using the connecting members 60. Once the connecting members 60 are installed on each retaining member 50 and connected to the upper retaining member 50, the retaining structure construction jig 10 may be removed.

According to the retaining structure construction jig 10 and the retaining structure construction method using the retaining structure construction jig 10 of the first embodiment, the retaining structure member 50 can be temporarily fixed, so that the work of attaching the connecting member 60 can be easily performed. In addition, the retaining structure construction jig 10 can be attached simply by fitting it into the flange portion of the retaining structure 100, and a worker can work with one hand. This makes it possible for a single worker to hold the retaining structure member 50 in one hand while fitting the retaining structure construction jig 10 with the other hand. Therefore, it is possible to reduce the number of workers when constructing the retaining structure 100.

The retaining structure construction jig 10 can temporarily fix the retaining member 50 by fitting it into the vertical connecting portion 82 formed only by the horizontal flange portion 51. The retaining structure construction jig 10 can be used in any location, allowing for a high degree of freedom in constructing the retaining structure 100 and improving work efficiency.

(Modification of the retaining structure construction jig 10)
9 is a three-view diagram of an earth-retaining structure construction jig 10a, which is a modified example of the earth-retaining structure construction jig 10 according to the first embodiment. FIG. 9(a) is a front view of the earth-retaining structure construction jig 10a, FIG. 9(b) is a side view, and FIG. 9(c) is a plan view. FIG. 10 is an exploded view of the earth-retaining structure construction jig 10a of FIG. 9. FIG. 11 is a side view of the state in which the earth-retaining structure construction jig 10a according to the first embodiment is fitted into the earth-retaining structure 100. FIG. 12 is a front view of FIG. 11. FIG. 13 is a top view of FIG. 11. The earth-retaining structure construction jig 10a according to the modified example has a different shape and arrangement of the multiple holding parts 11.

The retaining structure construction jig 10a has multiple holding parts 11 extending from the main body 12 in the y direction. A part of the side where the main body 12 of the multiple holding parts 11 is arranged is arranged so that the opposing flat surfaces 18a are parallel to each other with a distance H1. The tip 14 side of the multiple holding parts 11 is formed so that the distance H between the flat surfaces 18b is wider than the distance H1 on the base side. The flat surfaces 18b are inclined with respect to the y direction, and are formed so that the distance becomes wider toward the tip 14 side. By being configured in this way, the retaining structure construction jig 10a has the advantage that the vertical flange portion 53 is easily inserted when it is installed in the cross connection portion 83. The flat surfaces 18a and 18b of one of the retaining parts 11 may be referred to as the first plane, and the flat surfaces 18a and 18b that are positioned opposite the first plane may be referred to as the second plane.

As shown in Figure 13, the flat surface 18a on the base side holds the vertical flange portion 53 in a sandwiched manner, so that the retaining structure construction jig 10a has the advantage that it does not rattle after being installed on the cross-connecting portion 83 and is unlikely to come off even if vibrations or the like are applied. In addition, the flat surface 18b on the tip 14 side is spaced apart wider toward the tip 14, so the two holding portions 11 of the retaining structure construction jig 10a can support the retaining member 50 with a wide gap in the θ direction, allowing for stable temporary fixation.

Also, as shown in Figures 9(b), 10, and 11, a chamfer 21 is formed at the tip of the slit 20 into which the horizontal flange portion 51 is inserted. In other words, the distance between the retaining surface 13a and the retaining surface 13b may be formed so that the tip side is wider than the base side. By being configured in this way, the retaining structure construction jig 10a has the advantage that the horizontal flange portion 51 can be easily inserted into the vertical connecting portion 82 and the cross connecting portion 83.

As shown in Fig. 9(b) and Fig. 11, the arm 16b of the holding part 11 is formed with a positioning hole 17. When the retaining structure construction jig 10a is attached to the cross-connecting part 83, the positioning hole 17 is configured to overlap with the hole 54 provided in the vertical flange part 53. By inserting a rod-shaped tool into the positioning hole 17 and the hole 54 in the state shown in Fig. 11, the retaining structure construction jig 10a will not come off the retaining member 50 and the adjacent retaining members 50B and 50C can be accurately positioned. This prevents the retaining member 50 from coming off and falling even if an impact is applied to the retaining member 50 while it is temporarily fixed, and improves the safety of the work.

Also, as shown in FIG. 13, the retaining structure construction jig 10a can temporarily fix the retaining member 50 by fitting it into the vertical connecting portion 82 formed only by the horizontal flange portion 51.

Embodiment 2.
An explanation will be given of a retaining structure construction jig 210 according to embodiment 2. The retaining structure construction jig 210 is obtained by adding a beam member 40 to the retaining structure construction jig 10 according to embodiment 1. Note that components having the same functions and actions as those in embodiment 1 are given the same reference numerals and their explanation will be omitted.

Figure 14 is a top view (b) and a side view (a) of a retaining structure construction jig 210 according to embodiment 2. The retaining structure construction jig 210 according to embodiment 2 is obtained by adding a beam member 40 to the retaining structure construction jig 10 according to embodiment 1, and the main body 12 and the retaining portion 11 have the same shape. The beam member 40 protrudes vertically from the opposing flat surfaces 18 of the retaining portion 11 and is arranged to connect the flat surfaces 18 together. The lower surface 40d of the beam member 40 is arranged so as to be approximately flush with the retaining surface 13a. The end portion 40a of the beam member 40 is joined to the flat surface 18 by means of welding or the like.

Figure 15 is a plan view of the retaining structure construction jig 210 according to the second embodiment attached to the retaining member 50. A positioning hole 41 is provided through the center of the beam member 40. The retaining structure construction jig 210 attached to the vertical connecting portion 82 of the retaining structure 100 is attached by aligning the positioning hole 41 with the hole 55 provided in the horizontal flange portion 51, and inserting, for example, a rod-shaped tool through the positioning hole 41 and the hole 55. This prevents the retaining structure construction jig 210 from coming off the retaining member 50, and allows the position of adjacent retaining members 50 to be accurately aligned.

Embodiment 3.
An explanation will be given of a retaining structure construction jig 310 according to embodiment 3. The retaining structure construction jig 310 is obtained by adding a beam member 30 to the retaining structure construction jig 10a according to embodiment 1. Note that components having the same functions and actions as those in embodiment 1 are given the same reference numerals and their explanation will be omitted.

16 is a three-view diagram of the retaining structure construction jig 310 according to the third embodiment. FIG. 16(a) is a front view of the retaining structure construction jig 10, FIG. 16(b) is a side view, and FIG. 16(c) is a plan view. FIG. 17 is a side view of the retaining structure construction jig 310 according to the third embodiment fitted into the retaining structure 100. FIG. 18 is a front view of FIG. 17. FIG. 19 is a top view of FIG. 17. The retaining structure construction jig 310 according to the third embodiment includes a beam member 30. Unlike the beam member 40 according to the second embodiment, the beam member 30 is arranged so as to connect the outer surfaces of the retaining portion 11, i.e., the surfaces on the opposite side to the opposing flat surfaces 18a and 18b. Therefore, as shown in FIG. 19, the retaining structure construction jig 310 according to the third embodiment can be fitted into the cross-connecting portion 83 of the retaining structure 100 because the vertical flange portion 53 can be inserted between the retaining portions 11.

As shown in FIG. 16(c), the beam member 30 of the retaining structure construction jig 310 protrudes from the outer surface of the retaining portion 11, extends along the outer periphery of the main body portion 12, and connects the outer surfaces of the multiple retaining portions 11 together. The beam member 30 also protrudes in the x direction, and positioning holes 33 are formed at both ends in the x direction. The positioning holes 33 are provided so as to align with the holes 55 formed in the horizontal flange portion 51 of the retaining member 50. This allows the retaining member 50 to be accurately positioned by inserting a rod-shaped tool or the like into the positioning holes 33 and 55, and prevents the retaining structure construction jig 310 from coming off the retaining member 50.

The surface 34 of the beam member 30 of the retaining structure construction jig 310 is arranged to form approximately the same surface as the holding surfaces 13a and 13b. In other words, the surface 34 of the beam member 30 clamps and holds the horizontal flange portion 51. Because the beam member 30 clamps the horizontal flange portion 51 with a wide width in the x direction, the retaining structure construction jig 310 can stably temporarily fix the horizontal flange portion 51 of the retaining member 50.

The retaining structure construction jig 310 also has positioning holes 17 in the arms 16a and 16b of each of the multiple holding parts 11. As shown in FIG. 17, the retaining structure construction jig 310 is formed so that the positioning holes 17 and the holes 54 of the vertical flange parts 53 are aligned when the retaining structure construction jig 310 is attached to the cross-connecting part 83 of the retaining structure 100. Therefore, by inserting a rod-shaped tool or the like into the positioning holes 17 and the holes 54, the retaining structure construction jig 310 can position the retaining members 50 relative to each other and prevent them from coming off the retaining members 50.

The retaining structure construction jig 310 has positioning holes 17 and 33 in both the multiple retaining sections 11 and the beam member 30, so that it can be positioned and fixed to the holes 54 and 55 in the flange section regardless of whether it is placed in the vertical connecting section 82 or the cross connecting section 83 of the retaining structure 100.

(Modification of the retaining structure construction jig 310a)
20 is a plan view of an earth-retaining structure 100 in which an earth-retaining structure construction jig 310a, which is a modified example of the earth-retaining structure construction jig 310 according to the third embodiment, is fitted into the cross-connecting portion 83 of the earth-retaining structure 100. The earth-retaining structure construction jig 310a is provided with a plurality of holding portions 11 parallel to each other up to the tip 14, in comparison with the earth-retaining structure construction jig 310 described above. The earth-retaining structure construction jig 310a has a positioning hole 33 in the beam member 30, as in the earth-retaining structure construction jig 310, and also has a positioning hole 17 provided through the plurality of holding portions 11. The earth-retaining structure construction jig 310a not only holds the horizontal flange portion 51 with the two beam members 30, but also holds the vertical flange portion 53 from the base to the tip 14 of the plurality of holding portions 11, so that the flange portion of the earth-retaining member 50 can be held more stably. Furthermore, the retaining structure construction jig 310 can be positioned and fixed to the holes 54 and 55 in the flange portion regardless of whether it is placed in the vertical connecting portion 82 or the cross connecting portion 83.

The retaining structure construction jig 310a allows a rod-shaped tool to be inserted into the positioning holes 11 and 33, allowing the retaining members 50 to be positioned relative to each other. In addition, by inserting a rod-shaped tool into the positioning holes 11 and 33 of the retaining structure construction jig 310a and the holes 54 and 55 in the flange portion of the retaining member 50, the retaining structure construction jig 310a will not come off the vertical connecting portion 82 or the cross connecting portion 83.

The configurations shown in the above embodiments are merely examples, and each embodiment can be combined with each other, or can be combined with other known technologies. Furthermore, it is also possible to omit or change part of the configuration without departing from the gist of the invention.

10 Earth retaining structure construction jig, 10a Earth retaining structure construction jig, 11 Retaining portion, 12 Main body portion, 13 Retaining surface, 13a (first) retaining surface, 13b (second) retaining surface, 14 Tip, 15 Connection surface, 16a Arm portion, 16b Arm portion, 17 Positioning hole, 18 Plane, 18a Plane, 18b Plane, 20 Slit, 21 Chamfer, 30 Beam member, 33 Positioning hole, 34 Plane, 40 Beam member, 40a End portion, 40d Bottom surface, 41 Positioning hole, 50 Earth retaining member, 50A (first) Earth retaining member, 50B (second) Earth retaining member, 50C (third) Earth retaining member, 50a Corrugated portion, 51 Horizontal flange portion, 51a Lower flange portion, 51b Upper flange portion, 53 Vertical flange portion, 53a vertical flange portion, 53b vertical flange portion, 54 hole, 55 hole, 60 connecting member, 61 insertion portion, 70 ring body, 70A ring body, 70B ring body, 81 circumferential connection portion, 82 vertical connection portion, 83 cross connection portion, 90 vertical hole, 92 ground, 100 retaining structure, 210 retaining structure construction jig, 310 retaining structure construction jig, 310a retaining structure construction jig.

Claims (15)

A retaining structure construction jig that holds flange portions formed at the ends of a plurality of retaining members in a stacked state,
A main body portion,
A plurality of holding portions extending from the main body portion in directions intersecting each other,
The plurality of holding portions include
The distal ends are disposed at a predetermined interval in a first direction along the distal end edge of the flange portion,
a first arm portion and a second arm portion arranged in parallel along a second direction that is a direction perpendicular to the first direction;
The first arm and the second arm are
A retaining structure construction jig in which the two flange portions are arranged side by side with a gap of a width that allows for free insertion. The first arm portion is
a first holding surface facing the second direction;
The second arm portion is
A second holding surface opposed to the first holding surface,
The first holding surface and the second holding surface are
are arranged opposite each other,
The main body portion is
The retaining structure construction jig according to claim 1 , further comprising a connection surface that connects the first retaining surface and the second retaining surface. The gap between the first holding surface and the second holding surface is
The retaining structure construction jig according to claim 2 , wherein the tip is formed to be wider than the base at which the connection surface is disposed. The first holding surface and the second holding surface are
The retaining structure construction jig according to claim 2 or 3, having at least some surfaces parallel to each other. The plurality of holding portions include
A first holding portion and a second holding portion are included.
The first holding portion is
a first plane parallel to the second direction;
The second holding portion is
A second plane is disposed opposite the first plane,
Between the first plane and the second plane,
The retaining structure construction jig according to any one of claims 1 to 4, wherein a gap is formed that allows free insertion when the two flange portions are overlapped. The distance between the first plane and the second plane in the first direction is
The retaining structure construction jig according to claim 5 , wherein the tip is formed to be larger than the side on which the main body portion is arranged. The first plane and the second plane are
The retaining structure construction jig according to claim 5 or claim 6, wherein at least a portion of the retaining structure is parallel. The plurality of holding portions include
A first holding portion and a second holding portion are included.
A retaining structure construction jig as described in any one of claims 1 to 7, comprising a beam member protruding in the first direction from the first arm portion of the first retaining part and the first arm portion of the second retaining part. The beam member is
The retaining structure construction jig according to claim 8 , wherein the first arm portion of the first retaining portion and the first arm portion of the second retaining portion are connected to each other. The beam member is
The retaining structure construction jig according to claim 9 , which is located between the first retaining portion and the second retaining portion. The beam member is
A retaining structure construction jig as described in claim 8 or claim 9, which protrudes from an outer surface of the first retaining portion and the second retaining portion that is located on the opposite side of the inner surfaces that face each other. The beam member is
The retaining structure construction jig according to any one of claims 8 to 11, further comprising a positioning hole penetrating in the second direction. The plurality of holding portions include
The retaining structure construction jig according to any one of claims 1 to 12, comprising a positioning hole penetrating in the first direction. A method for constructing an earth retaining structure using the earth retaining structure construction jig according to any one of claims 1 to 13,
A lower flange portion formed at the lower end of a first earth retaining member constituting an earth retaining structure and an upper flange portion formed at the upper end of a second earth retaining member located below the first earth retaining member and connected to the first earth retaining member are overlapped,
A method for constructing an earth retaining structure, comprising a temporary fastening process for inserting the lower flange portion and the upper flange portion between the first retaining surface and the second retaining surface of the earth retaining structure construction jig. The temporary fixing step includes:
an upper flange portion formed at an upper end of a third earth retaining member located below the first earth retaining member and to the side of the second earth retaining member and connected to the first earth retaining member, and a lower flange portion of the first earth retaining member are overlapped;
The vertical flange portions formed on the horizontal ends of the second soil retaining member and the third soil retaining member are overlapped,
The method for constructing an earth retaining structure according to claim 14, wherein the vertical flange portion is inserted between the plurality of retaining portions.

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