JP2003184111A - Retaining wall construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retaining wall construction method capable of reducing load to a retaining wall, improving drainage efficiency and cutting a construction cost for a retaining wall structure. <P>SOLUTION: The retaining wall construction method is so constituted that a waste styrene foam crushed substance for physically crushing a waste styrene foam is lumped by means of an inorganic adhesive such as an inexpensive cement or the like at a plant to make lightweight permeable blocks, the permeable blocks are laminated in site work to facilitate the work, an optional drain outlet is formed if necessary and that a reinforcing material is piped during the lamination of the permeable blocks for improving strength. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining wall construction method, and satisfies civil engineering materials that have been conventionally desired, such as reduction of earth pressure, reduction of top load, improvement of water permeability, and reduction of scale of adjacent structures. And to provide the construction method.

[0002]

2. Description of the Related Art Conventionally, there have been the following problems in constructing a retaining wall. (B) A conventional general method for constructing a retaining wall has been a method in which concrete or a structure capable of retaining strength similar to that is erected, and a back portion of the structure is filled with a heavy material such as earth and sand. However, since a large earth pressure is applied to a structure such as concrete in this method, it is necessary to make the strength of the concrete part strong, and since the structure becomes large due to the consideration of the strength of the foundation part, It took a lot of labor and money to build. (B) Further, in that case, it is often necessary to lay a drainage pipe for the purpose of drainage inside, and when a road such as a car is laid on top of a large loading load such as earth and sand, The weights such as the above and the weights including the water content were added, resulting in an extremely large load. Further, there is a problem that ground subsidence occurs due to vibration of an automobile and the pipe is damaged by pressure. Therefore, it was necessary to lay a strong and expensive underdrain pipe. (C) Furthermore, when the filling material is earth and sand, the water content of the filling material may increase because the water permeability is not perfect, and the drainage pipe may frequently be clogged, and the drainage effect may not improve. Due to insufficient drainage in the filling area, the soil moisture content increased and the soil became soft, resulting in ground subsidence, damage to the sloped parts on the mountain side, and collapse. (D) Furthermore, in the conventional construction method, when considering water permeability, gravel and crushed stone are often used, and large heavy equipment has to be used for a long time, especially in locations where the site conditions are poor. It was difficult to carry the materials. Heavy equipment cost for that,
Since personnel expenses and expenses for consideration of risks may be enormous, there has been a strong demand for improvement. (E) On the other hand, when the filler is earth and sand, there are some methods to fill the filler instead of the synthetic resin filler having a low specific gravity. However, these fillers are expensive and lightweight. The purpose was only to reduce the wastewater, and little consideration was given to drainage.

[0003]

As described above, there are many problems in constructing a retaining wall, and in order to solve these problems, a lightweight material that replaces heavy materials such as sand and sand in the filling section is produced in a factory. The present inventor has found that the method of providing the work site and completing the work is most suitable. In the present invention, based on that knowledge, the earth pressure due to heavy materials such as earth and sand of the filling part hanging on the back part of the concrete retaining wall part is reduced by the lightweight material, and at the same time, the water permeability of the filling part is improved so that the generated water is quickly generated. To minimize the stress on the concrete retaining wall, and to reduce the filling work and reduce the cost.

[0004]

Means for solving the above-mentioned problems are as follows. It is well known that Styrofoam is produced by chemically foaming a styrene monomer produced from a petroleum raw material as a main raw material and adding a foaming agent to heat the foamed product to foam it. The foamed molded product is generally 10 to 100 times and has a specific gravity of 0.
Those of 1 to 0.01 are widely used in the market. The foam has features of weather resistance and deterioration resistance, and in particular, since the foam is composed of closed cells and the film of the closed cells is extremely tough, it has excellent characteristics in compression resistance and water impermeability. It is also well known to show. The expanded polystyrene is widely used as a container for fresh fish and shellfish, a packaging cushion material, an electrical product packaging material, etc. because of its light weight, heat insulation and water impermeability. In the present invention, by crushing waste Styrofoam after use of these Styrofoam products and solidifying with an inorganic adhesive, light weight, deterioration resistance, compression resistance, water permeability can be formed into an excellent lump, and this We have found that it is possible to reduce the soil pressure, water permeability, and sedimentation resistance of the filling part by using the lumps as a substitute for the filling material such as sand and sand in the retaining wall, thus simplifying the construction of the retaining wall structure. It was used as a means to measure.

DETAILED DESCRIPTION OF THE INVENTION

Styrofoam is heat-molded in a mold by adding a foam material to a polystyrene raw material. Therefore, the surface of the styrofoam molded product becomes a state in which the surface of the mold at the time of molding is transferred and becomes extremely smooth. Further, it is known that a polystyrene film is formed on the surface of the foamed product, which makes it difficult to adhere to cement alone without addition of an organic adhesive. For adhering the foam, an organic water emulsion adhesive such as an acrylic emulsion, a rubber emulsion, a petroleum resin emulsion or the like, a rubber adhesive, or a solvent melting type such as acetone or citrus oil is used. This has not been done and these methods have not been a pollution problem, cost and workplace preferred use. In the present invention, in view of these facts, when the Styrofoam molded product is crushed by physical stress, single bubbles on the surface or the crushed surface are partially damaged, and the surface becomes extremely rough due to crushing. I found out. The present inventor has described the principle in detail in the application “Natural culvert material made of used polystyrene foam and its manufacturing method” on November 30, 2001, but since the crushed surface is in a rough state,
It is possible to insert an inorganic adhesive (for example, cement) into the fine portion for mechanical adhesion. When a lump formed by such a method is used for constructing a retaining wall, it is necessary to pay particular attention to pressure resistance, and it is preferable to change the particle size of the waste styrene foam crushed product, its combination, and the manufacturing procedure. In particular, the styrofoam crushed product in the present invention does not maintain a constant shape, and it is not a good idea to use only the large crushed product. That is, a lump made only of large granular crushed material,
Since the pressure strength decreases because the voids are too large,
It is a good idea to fill the voids with small and medium-sized crushed materials.

Next, claim 1 will be described. Waste Styrofoam is a container for fresh seafood, a cushioning material for packaging,
In addition to electric product packaging materials, long-term stocks and defective products produced during factory production are included, and those having a foaming ratio higher than a certain expansion ratio of Styrofoam can be used in the present invention. The condition for completing claim 1 is that the waste polystyrene foam is crushed by physical stress and the surface is roughened. In the conventional cutting by melting with nichrome wire etc., the surface becomes a re-film-like smooth surface when the melted part during cutting is cooled and solidified, and it is extremely unsuitable for bonding, and it is impossible to bond with inorganic adhesive Is. The waste expanded polystyrene crushed pieces crushed by physical stress, the inorganic adhesive is kneaded into the porous part where the surface is rough due to the use and mixing of the inorganic adhesive, and the inorganic adhesive bridges the plurality of waste expanded polystyrene crushed pieces. , And can be blocked by mechanical adhesion in combination with its anchor effect. As the inorganic adhesive used at this time, a cement-based adhesive is the cheapest, and since the cement is hardened in the presence of water and is an exothermic reaction, it is more preferable to block the waste styrene foam crushed pieces. That is, since Styrofoam has a heat insulating property, it internally stores heat and promotes solidification. For the purpose of pressure-resistant blocking of the crushed pieces of waste Styrofoam of the present invention, it is preferable to use a mixture of crushed pieces of waste Styrofoam of a large size, and a mixture for production according to the retaining wall structure and its scale. Depending on the ratio, the selection of the compounding ratio in manufacturing varies. For example, in the case of a small-scale retaining wall structure, where the water permeability is not so important, the object can be sufficiently achieved by using crushed pieces in the range of 10 to 20 mm for blocking.
However, in a large-scale retaining wall structure, there are examples of laminated height and road laying on the upper part, and in such a case, pressure resistance is important. From this, the maximum crushed piece is set to 40 mm because the number of closed cells is increased, and the method of filling the voids generated in the waste expanded polystyrene block (hereinafter referred to as the water permeable block) with small and medium crushed pieces has the highest pressure resistance. It is suitable as a method of doing and is often used. Further, as a method of increasing the pressure resistance, it is possible to increase the ratio of the inorganic adhesive. Furthermore, it is possible to improve pressure resistance by mixing short fibers such as glass fibers, carbon fibers, and boron fibers when kneading the crushed pieces, the inorganic adhesive, and water. The present inventor has found that the water-permeable block thus produced regenerates the original performance of expanded polystyrene in pressure resistance, and can be applied to the retaining wall construction method, and the object can be achieved. And provided the method. Further, when the waste styrofoam is a large crushed piece, the ratio of the smooth surface remaining at the time of molding is high as it is, and many portions unsuitable for adhesion occur as described above. From this, it is preferable to roughen the smooth surface by mechanical force before crushing, and one example thereof is to pass waste styrofoam between drums or rolls with different vertical speeds in which a large number of pins are erected, and smooth by scratching stress. It is possible to roughen the surface. That is, the present method avoids the fact that the smooth surface remains in the waste styrofoam crushed pieces even after the waste styrofoam crushing when untreated, and causes a poor adhesion to the strength of the water-permeable block that is a solidified substance that causes adhesion failure. It is most preferable to apply it to the waste styrofoam crushing treatment when pressure resistance is required. As the inorganic adhesive, ordinary Portland cement, quick-setting cement, etc. are inexpensive and suitable for use. That is, when the crushed waste Styrofoam pieces themselves do not absorb water, when a water-permeable block is used, it is difficult to mold as a solidified product with an adhesive that does not readily absorb water and does not take up water inside the blocked product. . For example, water-emulsion type adhesives such as vinyl acetate resin, acrylic resin, and synthetic rubber are not preferable because they take a long time to form and have a problem.

Next, a method for producing a water-permeable block using waste styrene foam crushed pieces, an inorganic adhesive, and water to use the waste styrene foam crushed pieces will be described. The waste styrene foam crushed pieces preferably have a particle size of 10 to 40 mm crushed as described above, and the weight distribution used is 10 to 20 mm: 20.
˜30 mm: 30 to 40 mm = 40: 40: 20 is most suitable, but the particle size distribution of the water-permeable block is not particularly limited as it can be produced without any problem.
Even if a part of 10 mm or less or 40 mm or more is mixed in, the water-permeable block can be manufactured without any problem. In the production of the water-permeable block, the waste styrene foam crushed pieces, the inorganic adhesive, and the water mixing ratio are generally waste styrene foam crushed pieces: inorganic adhesive: water = 3 m ³ : 300 kg: 150 l, and particularly as a water permeable block manufacturing method. Not limited. A mixture of these crushed waste styrofoam crushed pieces is put in a mixer in the order of water and an inorganic adhesive and well kneaded, and then this mixture is filled into a mold prepared in advance and solidified. At this time, although Portland cement is usually sufficient as the inorganic adhesive, it is preferable to use a fast-curing type in order to further accelerate the curing. Cement-based adhesive cures by taking in water and generating heat and forming ettringite crystals, but it is an exothermic reaction and expediently, waste styrene foam fragments are heat-insulating, so heat is stored and cured inside. Has the effect of accelerating.
Thus, a water-permeable block having an apparent specific gravity of 0.05 to 0.4, which is mainly composed of waste styrofoam crushed pieces, can be manufactured. The water-permeable block is a waste styrofoam crushed piece that has been solidified by a cement-based adhesive in a shape having voids, and is molded as a lump having voids with extremely excellent water permeability and pressure resistance.

An example of construction of a retaining wall in which water-permeable blocks produced in this way are laminated is shown in FIG. FIG. 1 shows a concrete retaining wall portion (2), an entire water-permeable block portion (3), a roadbed portion (5) and a road surface portion (6) laid above it, a backfill material (8) for a mountain side inclined surface, etc. It consists of Generally, the entire permeable block part (3) is usually filled with earth or sand or crushed stone, and it is necessary to install a large-scale concrete retaining wall part (2) to support this earth pressure. When the road was laid on the upper part, the structure had to be able to withstand the load. In the present invention, by making the conventional filling portion of earth and sand or crushed stone the whole water permeable block portion (3), the weight can be reduced and at the same time rain water,
It is possible to prevent the increase or subsidence of earth pressure from the intrusion of groundwater and reduce the load on the concrete retaining wall (2). As a result, by reducing the required strength of the concrete retaining wall portion (2), it is possible to reduce the thickness of the concrete retaining wall portion (2), the foundation, the cost, and the construction period.

Next, claim 2 will be described with reference to FIGS. 2 and 6. The present proposal proposes that the shape of the water-permeable block produced by the technique of claim 1 is likely to cause slippage at the contact surface (11) between the water-permeable blocks during large-scale construction, and facilitates during laminated construction. Is a method of easily stacking layers, and is a method of constructing a drainage hole by utilizing the shape. FIG. 6 is a perspective view of the water permeable block (4). The water-permeable block (4) is
It is molded so as to have a fixing convex portion (15) and a fixing concave portion (14) on its back surface. The fixing convex portion is formed so that it can be fitted into the fixing concave portion of the water permeable block placed on the top of the fixing convex portion at the time of stacking. Further, this fixing recess is shown in FIG.
As described above, the drain hole portion (12) at the bottom of the water-permeable block stack can be formed. This drain hole (1
2) is the drain hole (12) as shown in FIGS. 4 and 5.
Drainage port (16)
It is possible to form a continuous drainage hole. In this way, the water-permeable block recess (14) formed in advance is used as the drain hole (12), and the drainage hole retaining wall construction method is used without separately laying the underdrain pipe.

Next, claim 3 will be described with reference to FIG. FIG. 7 is a cross-sectional view of the water-permeable blocks (4) according to claims 1 and 2 which are laminated and a mesh (17) is stretched between the layers. The purpose of stretching the net-like material between the water-permeable block layers (18) is to disperse the stress with respect to the concentrated load from the upper part, and by converting the longitudinal stress into the lateral stress, a strong water-permeable block laminate is formed. It is to make it a structure.
It is preferable that the net-like material (18) is continuously stretched between the water permeable blocks, but a method of stretching the net-like material having a constant width in a row can also be effective. When the net-like material (18) is stretched, the upper water-permeable block (4),
The joint surface of the lower water-permeable block (4) is preferably laminated on the flat surface portion (19), and may be designed as such when molding the water-permeable block. The net-like material thus inserted can be stretched in a plurality of layers.
Further, the net-like material also has an effect of preventing the water-permeable block (4) from slipping, which is preferable for the progress of construction. The net-like material (17) is preferably rich in corrosion resistance. For example, chemical fibers such as polyethylene, polypropylene, and nylon, or inorganic fibers such as glass fiber and steel fiber processed into a net-like shape, or Water-permeable materials such as those non-woven materials,
Alternatively, string-shaped, wire-shaped, and synthetic resin cage-shaped molded products can be used.

Next, claim 4 will be described with reference to FIGS. FIG. 4 is a plan view of the water permeable block (4) when the drain holes are formed in the length direction during molding, and the water permeable blocks (4) are connected in series. The drainage holes are continuously provided in the direction of the drainage port (16), and collect the water falling from the upper part of the laminated water-permeable block (4) to collect the drainage port (16).
Since it is guided to, it is preferable to continuously connect the position to the bottom of the laminated water-permeable blocks. The water drained from the upper part of the laminated water-permeable blocks (4) is promptly discharged to the outside from the drainage port (16) via the water-permeable blocks (4) that are continuously provided, and stays inside. Can be controlled. Similarly, in FIG. 5, drainage holes are formed in the width direction of the water permeable block (4) during molding,
It is an example of a top view at the time of connecting the water-permeable block (4) continuously. Construction by the same method as in FIG. 4 is preferable.

Next, claim 5 will be described with reference to FIGS. 7 and 8. A waterproof sheet (20) is laid on the bottom surface of the lowermost water-permeable block (4) in FIGS. Typically,
At the bottom, the backfill material (8) is the concrete retaining wall foundation (1
In many cases, it will be put on 0), which will cause water to accumulate, and there is a risk of fluidization at that part when using earth and sand. In order to avoid this problem, the waterproof sheet (20) is laid for the purpose of promptly promoting the drainage of water. The waterproof sheet (20) suitable for this purpose is generally made of rubber, vinyl chloride, or the like at a low cost, but if it is suitable for this purpose, there is no particular limitation in use. Waterproof sheet with a certain width (2
When 0) is used, it is necessary to take measures so as to prevent the intrusion of water from the upper part by heat fusion or adhering with an adjacent sheet. By stacking a water-permeable block on this waterproof sheet, drain holes that allow easy drainage can be formed.

Next, claim 6 will be described with reference to FIG. FIG. 9 shows that when molding a water-permeable block, the drainage hole (12) can be molded in any shape and angle (hereinafter referred to as a modified drainage hole), and the modified drainage hole manufactured according to the design is used. It is a top view at the time of connecting in series. This is particularly effective when the number of drainage ports (16) is not increased and drainage is performed quickly, or when the drainage ports are to be installed in a location that is aesthetically inconspicuous. The water accumulated from the upper part is concentrated in the drain hole portion (12), and finally the amount of water in the drain port portion increases and is discharged from the drain port to the outside.

Next, claim 7 will be described with reference to FIG. FIG. 8 is a cross-sectional view of the case where the underdrain pipe (21) is laid and the water permeable block (4) is laid on the upper part thereof. The underdrain pipe to be laid can be used as long as it meets the purpose of drainage accumulation and drainage according to the present invention, such as polyethylene underdrain pipe, vinyl chloride underdrain pipe, unglazed underdrain pipe, metal underdrain pipe, and the like. , The pipe wall must have a small inner hole for drainage to be able to collect water from the outside in the underdrain pipe. The water permeable block (4) is formed in a water permeable block shape that covers the underdrain pipe,
Water from the upper part of the stack is collected in the underdrain pipe through the water permeable block (4) and discharged to the outside through the drainage port (16) through the underdrain pipe (21). It is also possible to adopt a method in which the underdrain pipe is integrated by simultaneous molding at the time of molding.

[0015]

EXAMPLES The outline of the examples of the present invention will be described, but the scope of the present invention is not limited thereto.

(Production Example) A production example of the water-permeable block will be described below. The water-permeable block is manufactured using a mold. There is no particular problem with the material of the molding die, and examples thereof include metal, wood, FRP, and synthetic resin. In this production example, a metal product was used. These molds are often used repeatedly, and durable ones are suitable. Waste styrofoam crushed pieces were manufactured from used fish boxes obtained from the market. The fish box had a length of 80 cm, a width of 40 cm, a height of 20 cm, and a thickness of 4 cm, and this was put into a crusher and crushed. The crushed material obtained by this crushing is 10 m with a vibrating sorter.
m or less, 10 to 20 mm, 20 to 30 mm, 30 to 40
mm particle size of 5, 47, 40, 8% by weight, respectively
Manufactured in a distribution of. Each particle size mixture was used as a manufacturing raw material. 3 m ³ of the crushed waste Styrofoam pieces were put into a concrete mixer, and then 100 l of water was put thereinto to obtain 10
Mixed well. By the action of water, the positive electricity due to the friction of the waste styrofoam crushed pieces was prevented, dust did not rise, and the surface of the crushed waste foam styrene pieces could be made wet. Next, ordinary Portland cement (made by Taiheiyo Cement) 3
00 kg was added and kneaded well for 15 minutes. The kneaded product was placed in the metal mold, pressed, solidified, and released from the mold to obtain a water-permeable block similar to that shown in FIG. The water-permeable block thus produced was repeatedly produced and used for filling the back surface of the concrete retaining wall.

(Construction Example 1) Hereinafter, a construction example using the water permeable block shown in the production example will be described. This construction example 1 is shown in FIG.
It is a construction example by the water permeable block arrangement shown in FIG. A concrete pourable mold was installed at the concrete retaining wall installation site, and the standing foundations (10) and the concrete retaining wall were integrated to stand up. Next, the water permeable block was laminated on the back surface of the retaining wall. Hereinafter, the procedure for laminating the water-permeable blocks will be described. The backfill material (8) was laid 20 cm on the upper surface of the retaining wall foundation and then sufficiently filled with pressure, and a synthetic rubber-based impermeable sheet (20) of 1.5 mm was laid on the top. Further, a water permeable block (4) was placed on it. The water permeable blocks arranged in line in the lower layer were continuously connected so that the recesses of each water permeable block (4) were connected so that the recesses were continuous to the drainage port, thereby forming drainage holes. Next, the concave portions of the new water-permeable block were inserted into the convex portions formed on the upper portions of the water-permeable blocks that were arranged in a row, and were further arranged in a row. Meanwhile, backfill material was filled in the gap between the concrete retaining wall and the water permeable block and between the water permeable block and the slope on the mountain side. This work was repeated, but anchors that fixedly reinforce the concrete retaining wall and the mountain side were installed as needed. At the top, laying gravel and sand, the roadbed (5)
Was formed, and the asphalt part (7) was installed on the upper part of the road to make a road. Since the water-permeable block used for lamination in this manner is lightweight and has excellent workability, and also has excellent pressure resistance and water permeability, the thickness of the concrete retaining wall could be reduced by about 40%.
Incidentally, the weight of the water-permeable block is 0.1 t / m ³ , and when gravel is used, it is 2 t / m ³ , so it can be judged how lightweight the water-permeable block according to the present invention is.

(Construction Example 2) A construction example using the water-permeable block shown in the production example will be described below. This construction example 2 is a construction example using the water-permeable block arrangement and the net-like material shown in FIGS. 7 and 8. A concrete pourable mold was installed at the concrete retaining wall installation site, and the standing foundations (10) and the concrete retaining wall were integrated to stand up. Then
The water permeable block and the net-like material were laid on the back surface of the retaining wall. The backfill material (8) was laid 20 cm on the upper surface of the retaining wall foundation and then sufficiently filled with pressure, and a synthetic rubber-based impermeable sheet (20) of 1.5 mm was laid on the top. Further, a water permeable block (4) was placed on it. The water permeable blocks arranged in line in the lower layer were continuously connected so that the recesses of each water permeable block (4) were connected so that the recesses were continuous to the drainage port, thereby forming drainage holes. Next, the concave portions of the new water-permeable block were inserted into the convex portions formed on the upper portions of the water-permeable blocks that were arranged in a row, and were further arranged in a row. Meanwhile, backfill material was filled in the gap between the concrete retaining wall and the water permeable block and between the water permeable block and the slope on the mountain side. When the laid height of the water-permeable block reached two-thirds of the whole, a water-permeable block having a flat upper portion was laid, and then a polypropylene mesh (mesh diameter 40 mm) was further laid.
Next, a water-permeable block having a flat bottom was laid on the upper part of the block, and a polypropylene mesh was inserted as a reinforcing material between the planes of the lower water-permeable block and the upper water-permeable block. This method can be performed in multiple stages, but in this construction example, one layer was laid. Further, a water-permeable block was continuously arranged on the water-permeable block. The water permeable blocks lined up in the lower layer were continuously connected so that the recesses of the respective water permeable blocks were connected so that the recesses were continuous to the drainage port, thus forming drainage holes. Next, the concave portions of the new water-permeable block were inserted into the convex portions formed on the upper portions of the water-permeable blocks that were arranged in a row, and were further arranged in a row. Meanwhile, backfill material was filled in the gap between the concrete retaining wall and the water permeable block and between the water permeable block and the slope on the mountain side. This work was repeated, but anchors that fixedly reinforce the concrete retaining wall and the mountain side were installed as needed. At the top, a roadbed (5) was formed by laying gravel and sand, and an asphalt part (7) was installed on the top of the roadbed to form a road. The entire permeable block constructed in this way can relieve the load from the top when a road is constructed on the top with a mesh, and is extremely easy to lay, so it is extremely useful for retaining wall construction. It was effective.

[0019]

The retaining wall construction method according to the present invention is the same as the conventional retaining wall construction method because of the weight reduction of the rear surface of the retaining wall, the provision of water permeability, the formation of drainage holes, and the improvement of subsidence by the use of a reinforcing material. We were able to greatly improve and shorten the work period, reduce costs by reducing the scale of the retaining wall construction, and have a great effect on the conservative effect.
In addition, it also showed a great effect on the reuse of waste Styrofoam, which had been a problem in processing as waste.

[0020]

[Brief description of drawings]

[Figure 1] Cross-sectional view of retaining wall construction with water-permeable block

FIG. 2 is a sectional view of a retaining wall constructed by a water-permeable block having a connecting structure-1

FIG. 3 is a sectional view of a retaining wall constructed by a water-permeable block having a connecting structure-2

FIG. 4 is a plan view of FIG.

5 is a plan view of FIG.

FIG. 6 is a perspective view of a water-permeable block having uneven portions.

[Fig. 7] Cross-sectional view of laying reinforcement netting

[Fig. 8] Laminated sectional view of underdrain pipe laying and water permeable block laying

[0021]

[Explanation of symbols]

1: Retaining wall structure 2: Concrete retaining wall 3: Whole water-permeable block 4: Water permeable block 5: Roadbed 6: Road surface 7: Asphalt section 8: Backfill material 9: Mountain side slope 10: Retaining wall foundation 11: Block contact surface 12: Drain hole 13: Anchor 14: Water-permeable block recess 15: Convex part of water-permeable block 16: Drainage port 17: Mesh 18: Water-permeable block interlayer 19: Water-permeable block flat part 20: Tarpaulin 21: Underdrain

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[Procedure amendment]

[Submission date] April 2, 2002 (2002.4.2)

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

[Figure 1] Cross-sectional view of retaining wall construction with water-permeable block

FIG. 2 is a sectional view of a retaining wall constructed by a water-permeable block having a connecting structure-1

FIG. 3 is a sectional view of a retaining wall constructed by a water-permeable block having a connecting structure-2

FIG. 4 is a plan view of FIG.

5 is a plan view of FIG.

FIG. 6 is a perspective view of a water-permeable block having uneven portions.

[Fig. 7] Cross-sectional view of laying reinforcement netting

[Fig. 8] Laminated sectional view of underdrain pipe laying and water permeable block laying

[Fig. 9] Plan view of diagonal installation of underdrain pipe

[Explanation of symbols] 1: Retaining wall structure 2: Concrete retaining wall 3: Whole water-permeable block 4: Water permeable block 5: Roadbed 6: Road surface 7: Asphalt section 8: Backfill material 9: Mountain side slope 10: Retaining wall foundation 11: Block contact surface 12: Drain hole 13: Anchor 14: Water-permeable block recess 15: Convex part of water-permeable block 16: Drainage port 17: Mesh 18: Water-permeable block interlayer 19: Water-permeable block flat part 20: Tarpaulin 21: Underdrain

Claims (7)

[Claims] 1. A method for constructing a retaining wall which is constructed by using a waste expanded polystyrene block which is a water-permeable block obtained by crushing waste expanded polystyrene and solidifying with an inorganic adhesive. 2. A method for constructing a retaining wall, wherein the waste expanded polystyrene mass according to claim 1 has a connecting structure that allows easy connection with a plurality of waste expanded polystyrene masses, and the construction is carried out promptly using the structure. 3. A retaining wall construction method in which a net-like material is laid between the waste foamed polystyrene block layers for the purpose of improving the pressure resistance of claims 1 and 2 and reinforced. 4. A method of constructing a retaining wall, wherein waste styrofoam lumps have drainage holes for the purpose of drainage, and drainage holes are connected and formed in a state where the blocks are loaded. 5. A retaining wall construction method for facilitating quick drainage by laying a water impermeable sheet in the lower portion of the drainage hole according to claim 4. 6. A retaining wall construction method capable of constructing a drainage hole according to claim 5 by connecting the drainage holes in an arbitrary discharge port direction. 7. The method for constructing a retaining wall according to claim 1, wherein a drainage hole is formed by connecting an underdrain pipe in series, and waste styrofoam lumps are loaded on the drainage hole.