JPH11172680A - Back-fill material for drainage and drainage structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct drainage structure installed along a slope for draining rainwater and percolating water with excellent operating efficiency when lightweight foamed-resin blocks are piled up along the slope under a horizontal state. SOLUTION: The back-fill materials 10 for drainage have main body blocks 11 composed of a resin formed in the same triangle pole shape as a triangle pole shape along the horizontal direction formed between the foamed-resin blocks 21 for back filling and a slope when the foamed-resin blocks 21 for back filling formed in a rectangular parallelopiped shape are stacked along the slope under a horizontal state. Drain gutters along the direction of inclination of inclined planes arranged while being oppositely faced to the slope in the main body blocks 11 are formed to the inclined planes while nonwoven fabrics 12 are mounted extending over the whole surfaces. The back-fill materials 10 for drainage are disposed horizontally into triangle pole-shaped spaces formed among the foamed resin blocks 21 for back filling and the slope.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embankment material, a backfill material for retaining walls, and a method for draining rainwater and seepage water along a sloped ground when lightweight foamed resin blocks are stacked horizontally along the sloped ground. And a drainage structure using the drainage backfill material.

[0002]

2. Description of the Related Art In recent years, in various civil engineering works, a foamed resin block in which a lightweight foamed resin such as polystyrene foam is formed in a rectangular parallelepiped has been used as an embankment material and a backfill material. Workability using a lightweight foamed resin block significantly improves workability.

When such a foamed resin block is stacked horizontally along a slope as a backfill material or an embankment material, in order to drain seepage water, rainwater, and the like,
While covering the sloped land with a water-permeable sheet such as a nonwoven fabric, in a triangular prism-shaped gap formed along the horizontal direction between the foamed resin block and the water-permeable sheet covering the sloped ground,
It is designed to be filled with crushed stone. Rainwater or the like flows down along permeable sheets and crushed stones arranged along slopes.

[0004]

In such a drainage structure, a water-permeable sheet must be arranged so as to cover the entire surface of the sloped land, and there is a problem that the work is not easy. In addition, in order to fill the gap formed between the foamed resin blocks stacked along the horizontal direction and the water-permeable sheet covering the sloped ground, heavy crushed stones, in order,
It needs to be transported to a predetermined position. Transport of crushed stone
Usually, the work is carried out manually, and the work is carried out by transporting crushed stone, despite the fact that the workability has been significantly improved by using lightweight foam resin blocks as embankment material and backfill material. Properties will be significantly impaired.

[0005] Furthermore, when heavy crushed stone is filled between the sloped ground and the foamed resin block, for example, despite the use of a lightweight foamed resin block as a backfill material for the retaining wall, the crushed stone causes the crushed stone. A large lateral pressure will be applied to the wall. In this way, when a large lateral pressure is applied to the retaining wall,
In the event of an earthquake, large inertial forces may be applied to the retaining wall.

SUMMARY OF THE INVENTION The object of the present invention is to solve such a problem. An object of the present invention is to construct a drainage structure on a sloped land with good workability when stacking lightweight foamed resin blocks as embankment material and backfill material on the sloped land. And a drainage structure using the drainage backfill material.

[0007]

According to a first aspect of the present invention, there is provided a backfill material for drainage according to the present invention, wherein when a rectangular parallelepiped foamed resin block is stacked in a horizontal state along a sloped ground, the foamed resin block and the sloped ground are stacked. And a main body block formed of a foamed resin in the same triangular prism shape as a triangular prism space formed along the horizontal direction.

[0008] In the backfill material for drainage according to the second aspect of the present invention, a water-permeable sheet is provided on a slope of the main body block that is disposed to face a slope.

According to a third aspect of the present invention, in the backfill material for drainage according to the present invention, a drain groove is provided on an inclined surface of the main body block which is disposed to face the sloped ground along the slope direction of the sloped ground. The drainage structure of the present invention described in Item 4 is characterized in that, when the rectangular parallelepiped foamed resin blocks are stacked horizontally along the sloped ground, a triangular shape formed between the foamed resin block and the sloped ground along the horizontal direction. The columnar space is filled with the backfill for drainage according to claim 1, and a water-permeable sheet is interposed between the main body block and the sloped land of the backfill for drainage. I do.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing an example of an embodiment of a backfill material for drainage of the present invention. As shown in FIG. 2, this backfill material for drainage is formed by stacking a lightweight rectangular backfill foam resin block 21 having a rectangular parallelepiped shape as a backfill material between a retaining wall 22 provided on an inclined ground and an inclined ground. At this time, it is arranged so as to fill a space formed between the backfill foam resin block 21 and the sloped ground.

The backfill material 10 for drainage has a main body block 11 made of a lightweight foam resin and formed in a triangular prism shape having a vertical surface 11a and a horizontal surface 11b. The main body block 11 having a triangular prism shape has a right-angled triangular cross section by a vertical surface 11a and a horizontal surface 11b.
The axial direction is horizontally arranged such that the slope 11c facing the right-angled portion faces the sloped land on which the backfill foam resin blocks 21 are stacked.

On the slope 11c of the main body block 11, a plurality of drain grooves 11d extending along the width direction of the slope 11c are provided.
Each of them is provided at an appropriate interval in the axial direction with each opening on the slope 11c. And body block 1
The first slope 11c covers the entire slope 11c.
A nonwoven fabric 12 as a water-permeable sheet is attached by a tucker or the like. Therefore, the opening of each water passage groove 11 d is covered with the nonwoven fabric 12.

The main body block 11 is made of expanded polystyrene,
It is formed into a predetermined shape by a lightweight foamed resin such as a polypropylene foamed resin or a styrene-modified polyolefin foamed resin, for example, by an in-mold method. The in-mold method is a method in which resin particles containing a foaming agent are pre-expanded, the obtained pre-expanded particles are filled in a molding die, and foam molding is performed in the die. In addition, the main body block 11 is not limited to the configuration formed by such an in-mold method, and may be formed by providing each drainage groove 11d by post-processing in a foamed resin molded into a triangular prism shape by an extrusion method. .

The backfill material 10 for drainage having such a structure is as follows.
As shown in FIG. 2, as a backing material for the retaining wall 22, when a rectangular parallelepiped backing foamed resin block 21 is stacked in a plurality of stages along the horizontal between the retaining wall 22 and the inclined ground, the In a triangular prism-shaped space formed between the backfilling foam resin block 21 adjacent to the sloped ground and the sloped ground, the nonwoven fabric 12 covering the slope 11c is arranged along the horizontal direction while facing the sloped ground. You.

In this case, the vertical (width) length of the vertical surface 11a of the main body block 11 in the backfill material 10 for drainage is equal to the vertical length of the foam resin block 21 for backfill. The horizontal plane 1 of the main body block 11
The length in the horizontal (width) direction of 1b is set based on the inclination of the slope where the backfill material 10 for drainage is disposed and the axial length of the main body block 11. Therefore, the backfill material 10 for drainage is used for the backfill foam resin blocks 2 to be stacked.
The vertical surface 11a of the main body block 11 in each drainage backfill material 10 is filled in a triangular prism-shaped space formed between the base material 1 and the sloped land in an aligned state, and is disposed in the space.
While being in close contact with the vertical surface of the adjacent backfilling foam resin block 21, the horizontal surface 11 b of the main body block 11 is substantially horizontal at the same height as the upper surface of the adjacent backfilling foam resin block 21. As a result, 1 along the horizontal direction
The upper surfaces of the backfilling foam resin block 21 and the drainage backfilling material 10 forming the two stages are substantially horizontal flat surfaces, on which the backfilling foaming resin block 21 extends along the horizontal direction. Stacked.

The lower edge of the backfill foaming resin block 21 at the bottom is in contact with the lower edge of the drainage backfill material 10 disposed between the backfilling foam resin block 21 and the inclined ground. As described above, the crushed stone layer 23 is provided as a water permeable layer. A drain pipe 24 is provided horizontally between the crushed stone layer 23 and the ground surface.

When the backfill foam resin block 21 and the backfill material 10 for drainage are stacked to an appropriate height,
A concrete floor slab 25 is provided on the upper surface of the backfill foam resin block 21 and the drainage backfill material 10 which are stacked. Then, the backfill foam resin block 21 and the backfill material 10 for drainage are stacked on the concrete floor slab 25.

When the backfilling foam resin blocks 21 are stacked to a predetermined height as backfilling materials for the retaining wall 22 in this manner, the backfilling foaming resin blocks 21 stacked on the top and the drainage A concrete slab 25 is provided on the backing material 10, and a road 26 is formed on the concrete slab 25.

Between the backfilling foam resin block 21 stacked as the backfill material of the retaining wall 22 and the sloped land, the drainage backfill material 10 of the present invention is vertically continuous along the sloped ground. Because of the provision, the rainwater and the permeated water are provided on the nonwoven fabric 12 which is a water-permeable sheet attached to the slope 11c of the main body block 11 and the slope 11c of the main body block 11 in each drainage backfill material 10. It flows down sequentially through each drainage groove 11d. Then, water flowing down through the nonwoven fabric 12 of the lowermost backfilling material 10 for drainage and the drainage grooves 11d provided on the slope 11c of the main body block 11 flows from the crushed stone layer 23 to the drainage pipe 24.
Is discharged through.

The backfill material 10 for drainage according to the present invention may have a configuration in which the nonwoven fabric 12 which is a water-permeable sheet is not provided on the slope 11c of the main block 11. In this case, before stacking the foam resin blocks 21 for backfilling, after the sloping ground is covered with a water-permeable sheet such as a nonwoven fabric in advance and the foamed resin blocks are stacked along the sloping ground in a horizontal state,
The backfill material for drainage is arranged in the space between the foamed resin block 21 and the water-permeable sheet covering the sloped ground. Therefore, the backfill material for drainage filled in the space between the foamed resin block and the water permeable sheet covering the sloped ground has the slope of the main body block facing the water permeable sheet provided so as to cover the slope ground in advance. State.

[0022]

As described above, the backfill material for drainage of the present invention is formed between the sloping ground and the foamed resin block when the foamed resin blocks are piled up along the sloping ground in a state of extending in the horizontal direction. Into a triangular prism shape similar to a triangular prism space,
Since the main body block is made of a lightweight foamed resin, the space between the foamed resin block and the sloped land can be easily filled with high work efficiency. In addition, by providing the water-permeable sheet on the slope of the main body block that is arranged to face the sloped ground, it is not necessary to previously arrange the water-permeable sheet along the sloped ground, and the workability is further improved. Further, by providing a drain groove along the slope on the slope of the main body block, rainwater, seepage water, and the like can be reliably drained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a backfill material for drainage of the present invention.

FIG. 2 is a cross-sectional view showing an example of an embodiment of a drainage structure on a slope using the backfill material for drainage.

[Explanation of symbols]

 Reference Signs List 10 backfill material for drainage 11 body block 11a vertical surface 11b horizontal surface 11c slope 11d drainage groove 12 nonwoven fabric 21 foam resin block for backfill 22 retaining wall 23 crushed stone 24 drain pipe

Claims (4)

[Claims] When a rectangular parallelepiped foamed resin block is stacked in a horizontal state along a slope, the same triangle as a triangular prism-shaped space formed along the horizontal direction between the foamed resin block and the sloped ground. A backfill material for drainage, comprising a main body block formed of a foamed resin in a columnar shape. 2. The drainage backfill material according to claim 1, wherein a water-permeable sheet is provided on an inclined surface of the main body block which is arranged to face the sloped ground. 3. The backfill material for drainage according to claim 1, wherein a drainage groove is provided on a slope of the main body block facing the sloped ground, the drainage groove being provided along the slope direction of the sloped ground. 4. When a rectangular parallelepiped foamed resin block is stacked horizontally along a sloped ground, a triangular prism-shaped space along the horizontal direction formed between the foamed resin block and the sloped ground is provided. A drainage structure, wherein the drainage backfill material according to claim 1 is filled, and a water-permeable sheet is interposed between the main body block and the inclined ground of the drainage backfill material.