JP2634442B2 - Underground wall - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an underground wall, for example, a continuous underground wall which does not cause a change or interruption of groundwater flow.

[Conventional technology] A continuous underground wall built along with structures such as underground structures and underpasses causes changes and interruptions in the flow of groundwater, causing obstacles to the use of groundwater in the downstream and It may cause the drainage of the drainage section to deteriorate, which may cause a disaster. Conventionally, to prevent these troubles, an artificial permeable layer of sand, gravel, etc. has been provided at the bottom of the underground wall, or a permeable layer of sand, gravel, etc. has been provided along the wall of the underground wall. , Groundwater in contact with the underground wall was provided with water in both horizontal and vertical directions and drained.

However, in order to form a permeable layer, it is necessary to excavate a wide area around the continuous underground wall, especially the side surface, which has the disadvantage of significantly increasing the cost. There is no room and it is difficult to provide a permeable layer.

[Object of the Invention] The present invention has been made in view of the above circumstances. The purpose is to propose an underground wall with drain material that ensures drainage without obstructing the flow of groundwater.

[Configuration of the invention]

The present invention provides a drain material in which a filter material is coated on both sides of a plate material having an uneven surface on the top surface forming a water flow path on the ground side surface of an underground concrete wall, and a drain material is formed through the drain material. An underground wall for draining groundwater, and an underground wall provided with a drain pipe attached to the drain material to discharge groundwater through the drain material and the drain pipe.

〔Example〕

Embodiment 1 FIG. 1 shows two underground walls 2 and 2 arranged side by side in a ground 1 and an underground passage 3 constructed by excavating the ground between them. A drain member 4 is attached to the entire outer surface of the underground wall 2, that is, the wall surface in contact with the ground 1. Further, a water permeable layer 6 made of sand and gravel is provided below the cocrete layer 5 constituting the bottom of the underpass, and a water passage hole 7 is formed at a depth of the water tank on the underground wall. .

In the underground passage 3 thus constructed, the groundwater 8 outside the underground walls 2 and 2 flows freely through the drain 4 in the vertical direction.
Since the outside of 2 and 2 are connected by the water permeable layer 6 and the water hole 7, even if there is a layer in the ground 1 where water does not flow in the vertical direction,
The groundwater 8 can freely flow between the underground walls 2,2.

The drain material attached to the underground wall 2 is as shown in FIG. 2, in which a plate material 9 made of a hard vinyl chloride resin and having an uneven surface is covered with a filter material 10 made of a polyester fiber long-fiber nonwoven fabric. It is. The plate material 9 is provided with water channels by alternately protruding truncated quadrangular pyramid-shaped concave and convex portions 11 and 11 'on both surfaces thereof, and a through hole 12 is formed at a predetermined ratio on the top surface of the concave and convex portion. Yes, it connects the flow path on both sides. Filter material 10
Has a fine texture that prevents the dropping of earth and sand, and prevents the passage from being blocked by the earth and sand. This plate material has high rigidity, withstands a large compressive force, is hardly deformed and damaged, and exhibits its function for a long time together with the filter material. However, the drain material used in the present invention is not limited to this drain material. Any material can be used as long as it has rigidity and strength to withstand a large compressive force, forms a water-permeable layer for a long time, and can exert its function.

Embodiment 2: FIGS. 3, 4, and 5 show examples of construction of an underground wall.
3 and 4 show a state in which a reinforcing rod cage 15 is suspended in a trench 14 containing muddy water 13 obtained by excavating the ground 1 by a bentonite muddy method. The protective cloth 16 is attached. The protective cloth 16 is superimposed on the surface of the drain material 4, and a space between the drain material 4 and the reinforcing bar 15 corresponding to the thickness of the concrete cover is secured using a spacer or the like.

After arranging the reinforced basket, the drain material, and the protective cloth, concrete 17 is poured into the trench 14 using a tremy tube. Following the casting of the concrete 17, the protective cloth 16 is gradually pulled upward. FIG. 5 shows the underground wall 2 constructed in this manner.

The drain material 4 attached to the underground wall 2 forms a vertical flow path of the groundwater, and a horizontal flow path, for example, a permeable layer 6 in FIG. Can be formed. Also, a drain pipe 18 composed of a perforated pipe as shown in FIG. 7 is vertically attached in contact with the drain material 4 as shown in FIG. 6, and the water in the drain material 4 is stored and pumped. And can be drained. Alternatively, it can be used as an observation well for groundwater level.

In addition, at the time of enforcement, a protective cloth superimposed on the surface of the drain material 4
Numeral 16 is for preventing clogging of the surface of the filter material 10 by the bentonite mud 13, and fine-grained fabrics that do not penetrate the bentonite mud and adsorb well are suitable.

Example: 3 FIG. 8 shows an example of construction of a canal. When excavating the ground 1 and placing concrete, and constructing the continuous underground wall 2 of the side wall of the canal, a drain material 4 is provided at the lower end of the excavated ground. Place the reinforced cage
After the back was laid straight, concrete 17 was poured and the underground wall 2 was constructed.

During the construction of this channel, the amount of groundwater springing is large,
The cocrete to be injected was diluted with groundwater, and it was difficult to cast high-quality concrete, and there was no room for excavation to form a drainage path for groundwater. However, by arranging the drain material, the spring water is discharged to the side through the drain material layer, and the concrete component that has been placed in contact with the drain material is blocked by the filter material and does not flow out, and the high quality concrete ground The construction of the wall was completed. Also,
Even after the construction of the waterway, the groundwater on the back of the underground wall 2 could be discharged to the side via the drain material 4, and the free flow of the groundwater was maintained.

〔The invention's effect〕

The present invention has the above configuration. The underground wall has a drain material attached to a surface in contact with the ground, a drain hole having a through hole on a top surface forming a water flow path, and a filter material coated on both sides of a plate material forming an uneven surface. The material forms a permeable layer in which groundwater flows freely in the vertical direction. By providing a horizontal permeable layer communicating with the drain material, groundwater can flow freely. Further, by providing a drain pipe, outflow and drainage of groundwater can be made easier.

This underground wall can form a permeable layer only by arranging drain material on the ground side of the reinforcing bar prior to concrete injection, so excavation is more difficult than in the case of forming a permeable layer using conventional sand, gravel, etc. The volume is greatly reduced, a large amount of sand and gravel are not required, and both construction and material costs can be significantly reduced. However, it can be easily constructed even when there is no room for excavation.

The drain material placed in the excavated trench serves as a formwork when casting concrete, forms an accurate casting surface, and the concrete flows into the external space, and is separated or flows out by spring water This prevents the concrete from being cast. In addition, when placing concrete in contact with the drain material, depressurizing the drain material with a vacuum pump from the upper end of the drain material, dewatering excess water in the concrete, lowering the water-cement ratio, lowering the concrete strength, It can also be improved.

The underground wall according to the present invention is a steel sheet pile,
It can be applied to retaining walls, ridges, etc. built with concrete sheet piles. In addition, a permeable layer can be formed by attaching a drain material to a surface in contact with the ground behind the retaining wall.

Therefore, this underground wall does not impede the flow of groundwater,
It does not hinder groundwater use or drainage. In addition, this underground wall can be constructed at a low cost by providing a permeable layer, and can be constructed even in a narrow urban area where there is no room for excavation.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, and FIG.
Longitudinal section of an underpass constructed by excavating between two underground walls, Fig. 2 is a section of drain material, Fig. 3 and Fig. 5 are reinforcements placed in excavated trenches and concrete poured. Fig. 4 is an enlarged view of the main part of Fig. 3, Fig. 6 is a cross-sectional view of the underground wall with a drain pipe attached to a drain material, and Fig. 7 is a drain pipe. FIG. 8 is a longitudinal sectional view showing a state in which a drainage material is attached to the back of the underground wall constituting the waterway side wall to form a permeable layer. 1 ... ground mountain 2 ... underground wall 3 ... underground passage 4 ... drain material 5 ... concrete layer 6 ... permeable layer 7 ...
Permeability hole, 8: Groundwater, 9: Plate material, 10: Filter material, 11, 11 ': Uneven part, 12: Permeation hole, 13: Muddy water, 14
…… Trench, 15… Reinforcing cage, 16… Protective cloth, 17… Concrete, 18… Drain pipe.

Claims (2)

(57) [Claims] 1. A drain material having a through hole on a top surface forming a water flow path on a ground side surface of an underground concrete wall, and a filter material coated on both sides of a plate material having an uneven surface, the drain material being provided. Underground wall that drains groundwater through timber. 2. A drain material in which a filter material is coated on both surfaces of a plate material having an uneven surface and having a through hole on a top surface for forming a water flow path on a ground side surface of an underground concrete wall, and a drain in a vertical direction. Underground wall with pipes to drain groundwater through drain materials and drain pipes.