JP7416438B2 - Flood prevention wall, construction method of flood prevention wall, and precast concrete wall - Google Patents

Description

The present invention relates to a flood prevention wall that prevents water from entering a flood prevention target such as a building, a construction method for constructing the flood prevention wall, and a precast concrete wall that constitutes the flood prevention wall.

In recent years, buildings have frequently been flooded due to river bursts caused by torrential rains. As a technique for preventing flooding of buildings, etc., Patent Document 1 proposes a technique of constructing a flood prevention wall to surround a building, etc. The flood prevention wall of Patent Document 1 is constructed by arranging L-shaped blocks made of concrete. Specifically, this L-shaped block has an L-shaped cross section and includes a bottom plate section that extends horizontally and is installed underground, and a wall section that rises upward from the bottom plate section. Furthermore, in the flood prevention wall of Patent Document 1, a water stop material such as packing is interposed between adjacent L-shaped blocks, thereby preventing water from entering between the L-shaped blocks.

Patent No. 6501961

By the way, in the technique of Patent Document 1, since the L-shaped block has a bottom plate portion that is long in the depth direction, it is conceivable that the width of the site required for installing the L-shaped block becomes wider. Therefore, there is a problem in that the construction of flood prevention walls is likely to be subject to land restrictions.

Also, when installing L-shaped blocks, install water-stopping material between each adjacent L-shaped block, and install the L-shaped blocks so that the water-stopping material is sandwiched between the adjacent L-shaped blocks. There is a need. Therefore, it is necessary to draw one L-shaped block to the other L-shaped block and position it with high precision, which may make water stoppage work difficult.

The present invention has been made in view of the above circumstances, and provides a flood prevention wall, a method for constructing a flood prevention wall, and a precast concrete wall that is not subject to site restrictions and can facilitate water stoppage work. The main purpose is to donate the body.

In order to solve the above problems, the flood prevention wall of the present invention has the following features:
A flood prevention wall that is installed in a state raised above the ground to prevent water from flooding into a building or other object to be prevented from flooding,
Equipped with multiple walls arranged in the width direction,
The wall has a pair of opposing plate portions facing each other in the thickness direction of the wall,
Between each of the opposing plate portions, an intrawall space is formed that is open to at least both ends in the width direction and downward;
a support that is driven into the ground and whose upper end side enters the inner wall space from below;
a solidifying material that fills the intrawall space and connects the support and the wall;
The solidifying material is provided across the intra-wall spaces of the adjacent wall bodies.

According to the present invention, an intra-wall space that is open to both ends in the width direction and downward is formed between a pair of opposing plate portions of the wall, and a support body driven into the ground is inserted into the intra-wall space in a downward direction. It has entered from. The space within the wall is filled with a solidifying material such as concrete, and the supporting body and the wall are bonded to each other by the solidifying material. In this case, since the wall can be supported by the support, the wall can be stably installed without providing a bottom plate like the L-shaped block of the prior art (Patent Document 1 above). can. Therefore, it can be made less susceptible to land restrictions.

Furthermore, since the solidifying material is provided across the intrawall space of the adjacent wall bodies, the solidifying material can stop water between the adjacent wall bodies. In this case, by filling the internal wall space with a solidifying material during construction, it is possible to not only connect the wall and the support but also to stop water between the walls. Therefore, water stoppage work can be facilitated.

FIG. 2 is a perspective view showing a state in which flood prevention walls are installed around a building. A perspective sectional view showing a flood prevention wall. A vertical cross-sectional view showing a flood prevention wall. (a) is a perspective view showing a waterproof block, and (b) is a longitudinal sectional view. A diagram for explaining a method of constructing a flood prevention wall.

An embodiment embodying the present invention will be described below with reference to the drawings. Note that FIG. 1 is a perspective view showing a state in which a flood prevention wall is installed around a building.

As shown in FIG. 1, the flood prevention wall 10 is provided around the building 11 in a state that stands up above the ground 12. The flood prevention wall 10 is provided in an annular shape surrounding the building 11, for example, in a square annular shape. In this case, an inner area 13 on the inside surrounded by the water seepage prevention wall 10 is partitioned from an outer region 14 on the outside thereof by the water seepage prevention wall 10. This makes it possible to prevent water from entering the inner region 13 where the building 11 is provided from the outer region 14 in the event of flooding or the like. Note that the building 11 corresponds to the flood prevention target.

Next, the structure of the flood prevention wall 10 will be explained based on FIGS. 2 to 4. Note that FIG. 2 is a perspective sectional view showing the water intrusion prevention wall 10. FIG. 3 is a longitudinal sectional view showing the flood prevention wall 10. As shown in FIG. In FIG. 4, (a) is a perspective view showing the waterproof block 20, and (b) is a longitudinal sectional view.

As shown in FIGS. 2 and 3, the flood prevention wall 10 includes a plurality of waterproof blocks 20 arranged side by side. The waterproof block 20 is a rectangular wall-shaped block made of precast concrete. The waterproof blocks 20 are arranged side by side in the width direction (hereinafter also referred to as the block width direction), and are installed with their lower portions embedded inside the ground 12. Specifically, below the waterproof block 20, a plate-shaped foundation concrete 16 is provided buried in the ground 12, and the waterproof block 20 is placed on top of the foundation concrete 16. There is. Note that the waterproof block 20 corresponds to a wall.

As shown in FIGS. 2 to 4, the waterproof block 20 includes a pair of opposing plate parts 21 and 22 facing each other in the thickness direction, and an upper plate part 23 provided by connecting the upper ends of each of the opposing plate parts 21 and 22. It has Each of the opposing plate portions 21 and 22 is formed into a rectangular plate shape, and among the opposing plate portions 21 and 22, the opposing plate portion 21 faces the inner region 13, and the opposing plate portion 22 faces the outer region 14. There is. Although not shown, reinforcing bars are provided inside each of the opposing plates 21 and 22 and inside the upper plate 23, respectively.

An inner space 25 of the waterproof block 20 is formed between each of the facing plate parts 21 and 22. The inner space 25 is open to both ends in the width direction of the block and to the bottom. In this case, the inner spaces 25 of adjacent waterproof blocks 20 are continuous with each other. Further, the inner space 25 is covered from above by the upper plate portion 23. Note that the inner space 25 corresponds to the intra-wall space.

The upper plate portion 23 is provided with a plurality of (two in this embodiment) holes 27 that penetrate in the thickness direction. These holes 27 have a rectangular shape and are arranged symmetrically in the block width direction. The inner space 25 is opened upward through these holes 27.

The upper plate portion 23 has recesses 28 recessed inward in the same direction at both ends in the block width direction. These recesses 28 penetrate the upper plate portion 23 in the thickness direction. At the boundary between adjacent waterproof blocks 20, the recesses 28 of each waterproof block 20 face each other, so that a rectangular opening 29 is formed by the recesses 28. As a result, the inner space 25 is opened upward through the opening 29 at the boundary between adjacent waterproof blocks 20 .

A steel sheet pile 30 is provided below each waterproof block 20 and is driven into the ground 12. The steel sheet pile 30 is driven into the ground 12 while penetrating the foundation concrete 16. The steel sheet piles 30 are provided to extend in the direction in which the waterproof blocks 20 are lined up, and are continuously arranged astride the waterproof blocks 20. The upper end side of the steel sheet pile 30 enters the inner space 25 of the waterproof block 20 from below. In this case, the upper end of the steel sheet pile 30 is set at a position lower than the ground surface. In addition, the steel sheet pile 30 corresponds to a support body.

A bolt 31 serving as a fastening member is provided at the lower end side of each opposing plate portion 21, 22 of the waterproof block 20. The bolt 31 is provided across each of the opposing plate sections 21 and 22, and the opposing plate sections 21 and 22 are connected to each other via the bolt 31. Note that the bolt 31 corresponds to an opening suppressing member.

Of the opposing plate parts 21 and 22, the opposing plate part 21 is formed with an insertion hole part 33 into which the bolt 31 is inserted, and the opposed plate part 22 is formed with a screw hole part 34 into which the bolt 31 is fastened. There is. The screw hole 34 is a concave hole open only to the inner space 25, and has a female thread (not shown) formed on its inner peripheral surface. Specifically, the screw hole portion 34 is formed by inserting an insert screw having a female thread into a concave hole formed in the opposing plate portion 22 . Note that the insertion hole 33 corresponds to a first hole, and the screw hole 34 corresponds to a fastening hole. Further, the opposing plate portion 21 corresponds to one opposing plate portion, and the opposing plate portion 22 corresponds to the other opposing plate portion.

The steel sheet pile 30 is also formed with an insertion hole 35 into which the bolt 31 is inserted. The bolt 31 is fastened to a screw hole 34 of the opposing plate 22 through an insertion hole 33 of the opposing plate 21 and an insertion hole 35 of the steel sheet pile 30. Thereby, each opposing plate part 21, 22 and the steel sheet pile 30 are mutually connected via the bolt 31, and the waterproof block 20 and the steel sheet pile 30 are mutually connected by extension. Note that the insertion hole portion 35 corresponds to the second hole portion.

The bolts 31 are arranged at a plurality of locations in the width direction (the same direction as the block width direction) in each of the opposing plate parts 21 and 22. In this embodiment, the bolts 31 are arranged at three locations in each of the opposing plate parts 21 and 22, specifically, one bolt 31 is arranged at the center in the width direction of each of the opposing plate parts 21 and 22, and the remaining two bolts are arranged at each of the opposing plate parts 21 and 22, respectively. They are arranged at both ends of the plate parts 21 and 22 in the width direction, respectively. The opposing plate parts 21 and 22 and the steel sheet pile 30 are connected to each other via the plurality of bolts 31. Therefore, in correspondence with the plurality of bolts 31, a plurality of insertion holes 33 are formed in the opposing plate part 21, a plurality of insertion holes 35 are formed in the steel sheet pile 30, and a plurality of threaded holes are formed in the opposing plate part 22. A plurality of 34 are formed. Moreover, each bolt 31 is arranged below the ground surface.

The inner space 25 of each waterproof block 20 is filled with filling concrete 38. The filling concrete 38 is formed by being poured into the inner space 25 at the site and then solidified. Therefore, the filling concrete 38 is formed of cast-in-place concrete. Note that the filling concrete 38 corresponds to the solidifying material.

The filling concrete 38 is filled throughout the inner space 25. Further, in the inner space 25, the steel sheet piles 30 and bolts 31 are buried in filling concrete 38. In this case, the steel sheet pile 30 and the waterproof block 20 are connected via the bolts 31, and the steel sheet pile 30 and the waterproof block 20 are connected to each other by the filling concrete 38. Moreover, the filling concrete 38 is filled across the inner spaces 25 of the adjacent waterproof blocks 20. Therefore, the filling concrete 38 blocks water between adjacent waterproof blocks 20.

Next, a construction method for constructing the flood prevention wall 10 will be explained. FIG. 5 is a diagram for explaining such a construction method.

First, as shown in FIG. 5(a), a steel sheet pile driving process is performed in which the steel sheet piles 30 are driven into the ground 12. In this step, the steel sheet piles 30 are driven into the ground 12 using a pile driver or the like. Moreover, in this process, the steel sheet pile 30 is driven so that a part of the upper end side of the steel sheet pile 30 protrudes upward from the ground 12. After driving the steel sheet piles 30, foundation concrete 16 is placed on the ground 12 (see FIG. 5(b)). Note that the steel sheet pile driving process corresponds to the support body driving process.

Next, as shown in FIG. 5(b), a waterproof block installation step of installing the waterproof block 20 is performed. In this step, the waterproof block 20 is installed on the foundation concrete 16 with the upper end side of the steel sheet pile 30 inserted into the inner space 25 of the waterproof block 20 from below. When installing the waterproof block 20, the waterproof block 20 is lifted up by a crane, and in this state, the waterproof block 20 is moved to the installation position and installed. At this time, the installation work is performed using, for example, a backhoe equipped with a crane. Note that the waterproof block installation process corresponds to the wall installation process.

Next, as shown in FIG. 5(c), a connection step is performed in which the waterproof block 20 and the steel sheet pile 30 are connected with bolts 31. In this step, first, a hole forming step is performed to form an insertion hole portion 35 in the steel sheet pile 30 through which the bolt 31 is inserted. In this step, an insertion hole 35 is formed in the steel sheet pile 30 by a drill through the insertion hole 33 of the opposing plate 21 of the waterproof block 20. Subsequently, a bolt connection process is performed in which each opposing plate part 21 , 22 and the steel sheet pile 30 are connected using bolts 31 . In this step, the bolt 31 is fastened to the screw hole 34 of the opposing plate 22 through the insertion hole 33 of the opposing plate 21 and the insertion hole 35 of the steel sheet pile 30.

Next, as shown in FIG. 5(d), a concrete filling process is performed in which the inner space 25 of the waterproof block 20 is filled with filling concrete 38 in a fluid state and then solidified. In this step, the filling concrete 38 is poured (cast) in a fluid state into the inner space 25 through the hole 27 of the waterproof block 20. Also, at this time, the filling concrete 38 is filled across the inner spaces 25 of the adjacent waterproof blocks 20. After a predetermined period of time has elapsed after filling the filling concrete 38, the filling concrete 38 solidifies. As a result, the waterproof blocks 20 and the steel sheet piles 30 are joined by the filling concrete 38, and water is stopped between adjacent waterproof blocks 20. Note that the concrete filling process corresponds to the solidifying material filling process.

Through each of the above steps, the flood prevention wall 10 is constructed, and the series of operations is completed.

According to the configuration of this embodiment described in detail above, the following excellent effects can be obtained.

(1) In the waterproof block 20, an inner space 25 that is open to both ends and downward in the width direction (block width direction) is formed between the pair of opposing plate parts 21 and 22, and the inner space 25 is driven into the ground 12. The upper end side of the steel sheet pile 30 was inserted from below. The inner space 25 is filled with filling concrete 38, and the steel sheet pile 30 and the waterproof block 20 are connected to each other by the filling concrete 38. In this case, since the waterproof block 20 can be supported by the steel sheet pile 30, the waterproof block 20 can be stably installed without providing a bottom plate like the L-shaped block of the prior art (Patent Document 1 above). can do. Therefore, it can be made less susceptible to land restrictions.

Furthermore, since the filling concrete 38 is provided across the inner spaces 25 of the adjacent waterproof blocks 20, the filling concrete 38 can stop water between the adjacent waterproof blocks 20. In this case, by filling the inner space 25 with filler concrete 38 during construction, it is possible to not only connect the waterproof block 20 and the steel sheet pile 30 but also to stop water between the waterproof blocks 20. Therefore, water stoppage work can be facilitated.

(2) Since the steel sheet piles 30 are used as supports for supporting the waterproof blocks 20, a continuous wall portion can be constructed using the steel sheet piles 30 in the ground 12 below the waterproof blocks 20. This makes it possible to prevent water from flowing into the building 11 through the ground 12 under the wall during flooding.

(3) Since the waterproof block 20 is configured to include the upper plate portion 23 that connects the pair of opposing plate portions 21 and 22 at the upper end side, the insertion route for the steel sheet pile 30 into the inner space 25 is secured, and the pair of opposing plate portions 21 and 22 are connected at the upper end side. The strength of the waterproof block 20 including the facing plate parts 21 and 22 can be increased.

(4) The upper plate portion 23 of each waterproof block 20 was formed so that an opening 29 for opening the inner space 25 upward was formed at the boundary between adjacent waterproof blocks 20. Specifically, recesses 28 are formed at both ends of the upper plate portion 23 in the block width direction, and an opening 29 is formed by the recesses 28 facing each other at the boundary between adjacent waterproof blocks 20. did. In this case, when filling the inner space 25 with the filling concrete 38, the air in the inner space 25 can be removed through the opening 29. Therefore, it is possible to prevent air from accumulating in the inner space 25 at the boundary between adjacent waterproof blocks 20, thereby preventing insufficient filling of the filling concrete 38. As a result, it is possible to suppress a decrease in water-stopping performance between adjacent waterproof blocks 20.

Furthermore, when filling the inner space 25 with the filling concrete 38, it is also possible to check through the opening 29 whether the filling concrete 38 is sufficiently filled at the boundary between adjacent waterproof blocks 20. Therefore, it is convenient for ensuring water-tightness between adjacent waterproof blocks 20.

(5) In the waterproof block 20 having the inner space 25 opened downward, when filling the inner space 25 with the filling concrete 38, the opposing plate parts 21 and 22 are pushed outward by the filling pressure and open. is possible. In that case, for example, only the facing plate parts 21 and 22 of one of the adjacent waterproof blocks 20 may be opened, and thereby a gap may be created between the adjacent facing plate parts 21 and 22. In this case, the filling concrete 38 may leak from the gap, and there is a possibility that the filling concrete 38 may be insufficiently filled at the boundary between adjacent waterproof blocks 20, and there is a concern that the water-stopping property may deteriorate.

Therefore, in the above embodiment, in view of this point, each waterproof block 20 is provided with an opening suppressing member that suppresses the opposing plate portions 21 and 22 from opening to the side away from each other when filling with the filling concrete 38. has been established. Specifically, a bolt 31 is provided as an opening suppressing member to connect each opposing plate part 21, 22. Thereby, it is possible to suppress opening of each of the opposing plate parts 21 and 22 during filling with the filling concrete 38, and therefore it is possible to suppress a decrease in water-stopping properties due to the opening of the opposing plate parts 21 and 22.

(6) The bolts 31 are fastened to the screw holes 34 of the opposing plate 22 through the insertion holes 33 of the opposing plate 21 and the insertion holes 35 of the steel sheet pile 30, so that when filling with the filling concrete 38, The opening of each opposing plate part 21, 22 is suppressed. In this configuration, the opposing plate parts 21 and 22 and the steel sheet pile 30 are connected to each other via the bolts 31, and the filling concrete 38 is filled in the connected state, so that the waterproof block 20 and the steel sheet pile 30 are more easily connected. Can be strongly bonded.

(7) The opposing plate portion 22 is provided facing the outer region 14, and the opposing plate portion 22 is provided with a concave screw hole portion 34 that is open only to the inner space 25. As a result, in the above-mentioned configuration in which opening of the opposing plate parts 21 and 22 is suppressed by connecting the opposing plate parts 21 and 22 with the bolts 31, water flows toward the building 11 through the periphery of the bolts 31 when flooded. You can definitely avoid getting into it.

(8) Since the bolts 31 are provided at multiple locations in the width direction of the waterproof block 20, the steel sheet pile 30 extending in the width direction and the waterproof block 20 can be firmly connected. Further, since the bolts 31 are arranged at both ends of each of the opposed plate parts 21 and 22 in the width direction, opening of both ends of each of the opposed plate parts 21 and 22 can be suppressed during filling with the filling concrete 38. As a result, one of the adjacent opposed plate parts 21 and 22 of the adjacent waterproof blocks 20 opens, resulting in the above-mentioned disadvantage that a gap is created between the opposed plate parts 21 and 22 (see (5) above). can be suitably suppressed.

(9) Since the waterproof block 20 is formed into a hollow shape having the inner space 25, the weight of the waterproof block 20 can be reduced, and the installation work of the waterproof block 20 can be made easier. For example, it becomes possible to lift and install the waterproof block 20 using a backhoe equipped with a crane.

The present invention is not limited to the above embodiments, and may be implemented, for example, as follows.

- In the above embodiment, the waterproof block 20 as a wall is made of precast concrete having the opposing plate parts 21 and 22 and the upper plate part 23, but the structure of the wall is not necessarily limited to this. For example, the wall may include a pair of opposing plate parts made of precast concrete that are provided separately from each other, and a connecting member that connects the opposing plate parts while being spaced apart from each other. In this case, the connecting member may be a fastening member such as a bolt. Also in the wall body having such a configuration, an intra-wall space is formed between the pair of opposing plate parts. Therefore, a flood prevention wall can be constructed by installing a wall body with the steel sheet piles 30 inserted into the wall space from below, and then filling the wall space with filler concrete 38.

- In the above embodiment, the threaded hole portion 34 into which the bolt 31 is fastened is formed in the opposing plate portion 22, but this can be changed to form an insertion hole portion into which the bolt 31 is inserted, for example, in the opposing plate portion 22. At the same time, a nut to be fastened to the bolt 31 may be provided on the outer surface of the opposing plate portion 22. In this case, the bolt 31 is fastened to the nut through the respective insertion holes 33 and 35 of the opposing plate part 21 and the steel sheet pile 30. Note that in this case, the nut corresponds to the member to be fastened.

- Although the bolt 31 is used as a fastening member in the above embodiment, other fastening members such as screws may be used.
- In the above embodiment, the bolts 31 were used to suppress the opening of the opposing plate parts 21 and 22 when filling the filling concrete 38, but members other than the bolts 31 were used to suppress the opening. You can. For example, it is conceivable to use a U-shaped clamping member that clamps the opposing plate parts 21 and 22. In this case, the clamping member is fitted from below each of the opposing plate parts 21, 22 so that each of the opposing plate parts 21, 22 enters inside thereof. Such a configuration also makes it possible to suppress the opening of each of the facing plate parts 21 and 22. Further, in this case, it is preferable that the clamping member is attached to the waterproof block 20 in advance at a factory.

- In the above embodiment, the steel sheet pile 30 is used as a support that supports the waterproof block 20 while being driven into the ground 12, but something other than the steel sheet pile 30, such as a pile, may be used as such a support. .

- In the above embodiment, the waterproof block 20 is made of concrete, but it may also be made of resin or metal.

- In the above embodiment, the inner space 25 of the waterproof block 20 is filled with the filling concrete 38 as a solidifying material, but the inner space 25 may be filled with a solidifying material other than concrete, such as mortar. In short, any material that can be filled into the inner space 25 in a fluid state and then solidified can be used as the solidifying material.

- In the above embodiment, the flood prevention wall 10 is provided in an annular shape surrounding the building 11, but the flood prevention wall 10 does not necessarily need to be provided in an annular shape. For example, if there is a part on one side of the building 11 that is higher than the ground level, such as a hill, the flood prevention wall 10 may be arranged in a U-shape in plan view so as to surround the building 11 along with that part. . In this case as well, flooding of the building 11 can be prevented.

- In the above embodiment, the flood prevention wall 10 was provided to prevent water from entering the building 11, but it may also be provided, for example, to prevent water from entering a facility such as a drainage pump station.

DESCRIPTION OF SYMBOLS 10... Flood prevention wall, 11... Building as a flood prevention target, 20... Waterproof block as a wall body, 21... Opposing board part as one opposing board part, 22... Opposing board part as another opposing board part, 23... Upper plate part, 25... Inner space as intra-wall space, 29... Opening, 30... Steel sheet pile as support, 31... Bolt as fastening member and opening suppressing member, 38... Filler as solidifying material concrete.

Claims (9)

A flood prevention wall that is installed in a state raised above the ground to prevent water from flooding into a building or other object to be prevented from flooding,
Equipped with multiple walls arranged in the width direction,
The wall has a pair of opposing plate portions facing each other in the thickness direction of the wall,
Between each of the opposing plate parts , an inner wall space is formed that is open to both ends in the width direction and downwardly,
The wall is provided with an open area that opens the intra-wall space upward;
a support that is driven into the ground and whose upper end side enters the inner wall space from below;
a solidifying material that fills the intrawall space and connects the support and the wall,
The solidifying material is a water intrusion prevention wall provided across the intra-wall spaces of the adjacent wall bodies. The flood prevention wall according to claim 1, wherein the support body is a steel sheet pile extending in the direction in which the wall bodies are lined up. The flood prevention wall according to claim 1 or 2, wherein each of the wall bodies has an upper plate part that is provided by connecting upper end sides of the pair of opposing plate parts and covers the inner wall space from above. 4. The water intrusion according to claim 3, wherein the upper plate portions of the adjacent wall bodies are formed such that an opening that opens the intra-wall space upward is formed at a boundary between the adjacent wall bodies. prevention wall. Each of the walls includes, at a position below the upper plate part, an opening suppressing member that suppresses the opposing plate parts from opening to the side away from each other when filling the inner wall space with the solidifying material. The water intrusion prevention wall according to claim 3 or 4, which is provided. The opening suppressing member is a long fastening member,
A first hole portion through which the fastening member is inserted is formed in one of the opposing plate portions,
The support body is formed with a second hole through which the fastening member is inserted,
The fastening member is provided through the first hole and the second hole in a fastening hole provided in the other opposing plate of each of the opposing plates or on the outside of the other opposing plate. The water intrusion prevention wall according to claim 5, which is fastened to a member to be fastened. The other opposing plate portion is provided facing an outer region that is a region on the opposite side of the flood prevention target with the flood prevention wall in between,
The flood prevention wall according to claim 6, wherein the other opposing plate portion is provided with the concave fastening hole portion that is open only to the inner wall space. A construction method for constructing the flood prevention wall according to any one of claims 1 to 7, comprising:
a support driving step of driving the support into the ground;
a wall installation step of installing the wall with the upper end side of the support body entering the inner wall space;
a solidifying material filling step of filling the internal wall space with the solidifying material in a fluid state and then solidifying the solidifying material,
In the solidifying material filling step, the solidifying material is filled across the intrawall spaces of the adjacent wall bodies. A wall body made of precast concrete constituting the flood prevention wall according to claim 6 or 7,
comprising: the pair of opposing plate portions that form the intra-wall space; and the upper plate portion that covers the intra-wall space from above;
A wall body made of precast concrete, wherein the first hole is formed in one of the pair of opposing plate parts, and the fastening hole is formed in the other opposing plate part.

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