JP3777085B2 - Construction method of underground storage structure and underground storage structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing an underground storage structure that uses a continuous underground wall as a side wall, and an underground storage structure.
[0002]
[Prior art]
Conventionally, underground storage structures such as underground adjustment ponds are constructed with a continuous underground wall as a retaining member, and after excavating the interior, the main body is driven on site or using a precast member Is building. In this case, the lifting of the structure due to the buoyancy of the groundwater is dealt with by the weight of the structure or the covering soil. In addition, for insufficient ground bearing capacity, the ground is improved or pile foundations are used.
[0003]
[Problems to be solved by the invention]
However, in order to resist buoyancy by the weight of the structure, it is necessary to increase the thickness of the structural members, which increases the construction cost. In addition, there is a method of securing the volume by reducing the water depth relative to the groundwater level and widening the bottom area of the structure, but a large site is required.
[0004]
The present invention has been made in view of such problems, and the object thereof is to provide a method for constructing an underground storage structure and an underground storage structure that are thin in member thickness, have a small required site, and are excellent in economy. To provide things.
[0005]
[Means for Solving the Problems]
A first invention for achieving the above-described object includes a step of providing a continuous underground wall in the ground, a step of excavating the inside of the continuous underground wall, and a check valve inside the continuous underground wall. And a step of providing a bottom slab having an underground storage structure comprising the continuous underground wall and the bottom slab.
In the first invention, a continuous underground wall is provided in the ground, and after excavating the inside of the continuous underground wall, a bottom plate having a check valve is installed, and an underground storage structure is formed by the continuous underground wall and the bottom plate. To do.
The second invention comprises: a continuous underground wall provided in the ground; and a bottom plate having a check valve provided in the continuous underground wall by excavating the continuous underground wall. It is a characteristic underground storage structure.
In the underground storage structure according to the second aspect of the present invention, water normally flows into the inside from the check valve, so that buoyancy is not applied to the bottom plate.
[0006]
[Means for Solving the Problems]
A first invention for achieving the above-described object includes a step of providing a continuous underground wall in the ground, a step of excavating the inside of the continuous underground wall, and a check valve inside the continuous underground wall. An underground storage structure in which underground water flows into the interior through the check valve by the continuous underground wall and the bottom plate. It is a construction method of things. In the first invention, a continuous underground wall is provided in the ground, and after excavating the inside of the continuous underground wall, a bottom plate having a check valve is installed, and an underground storage structure is formed by the continuous underground wall and the bottom plate. To do. The second invention comprises a continuous underground wall provided in the ground, the underground diaphragm walls inside is drilled, and a bottom plate having a check valve provided inside the underground diaphragm walls, the groundwater Flows into the inside through the check valve . In the underground storage structure according to the second aspect of the present invention, water normally flows into the inside from the check valve, so that buoyancy is not applied to the bottom plate.
[0007]
Concrete or the like is placed in the groove 3 to form a continuous underground wall 9. Then, as shown in FIG. 2, the inside of the continuous underground wall 9 is excavated by a bulldozer 11 or the like, and the bucket or the like 12 loaded with excavated soil 13 is lifted by the crane 7 and discharged.
[0008]
As shown in FIG. 3, the continuous underground wall 9 is used as a side wall as it is, and a bottom plate 15 having a check valve (not shown in FIG. 3) is formed at the bottom. 17 is installed. The inflow waterway work 19 is connected to the rainwater pipe work 18. During a flood, rainwater is temporarily stored in the underground basin 20 through the rainwater pipe work 18, the inflow waterway work 19, and the step-type pressure reducing work 17.
[0009]
Further, as shown in FIG. 4, the support column 21 is installed, and the top plate 23 is formed on the upper part of the underground type adjustment pond 20. And as shown in FIG. 5, the upper part of the top plate 23 is backfilled with the covering soil 31, and the underground type | formula adjustment pond 20 is constructed | assembled. In FIG. 5, the staircase type waterway depressurizer 17, the rainwater pipe works 18, the inflow waterway works 19, and the like are not illustrated, and the water permeable layer 34 exists on the water blocking layer 33 such as a clay layer.
[0010]
As shown in FIG. 5, the bottom plate 15 has a check valve 24. A water collection layer 25 is provided below the bottom plate 15. Under normal conditions, the groundwater that has flowed into the water collection layer 25 flows into the underground basin 20 through the check valve 24, so that buoyancy is not applied to the bottom plate 15. The inflowing groundwater is sucked up by a pumping pump 29 provided in the water collecting pit 27 and discharged to the outside through a drain pipe 30.
[0011]
During a flood or the like, rainwater from the rainwater pipe work 18 is stored in the underground adjustment pond 20 through the inflow waterway work 19 and the staircase type pressure reduction work 17. In this case, rainwater does not flow out from the inside of the underground type adjustment reservoir 20 toward the outside of the underground type adjustment reservoir 20 by the action of the check valve 24. When the flooding is finished, the rainwater stored in the subterranean regulating pond 20 is discharged to the outside by the pumping pump 29.
[0012]
The length of the continuous underground wall 9 is determined by the amount of groundwater flowing in from the bottom plate 15, the drainage capacity of the pumping pump 29, etc., and does not necessarily need to reach the water blocking layer 33.
Thus, the thickness of the bottom plate 15 and the continuous underground wall 9 can be reduced by flowing groundwater from the bottom plate 15 to reduce buoyancy.
[0013]
The technical scope of the present invention is not limited to the embodiment described above. For example, a structure without the column 21 can be used, or the top plate 23 can be a dome roof. The depressurization work is not limited to the stair-type depressurization work 17, but can be a vertical drop type, a rapid flow work type, or a spiral type. There is a case where a side wall is newly constructed inside the continuous underground wall 9 and the continuous underground wall 9 is used as a part of the side wall. Moreover, the underground type adjustment reservoir 20 can be formed in a prismatic shape instead of a cylindrical shape. Moreover, the underground storage structure which concerns on this invention can be utilized other than an underground type regulation pond.
[0014]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a method for constructing an underground storage structure and an underground storage structure that are thin in member thickness, have a small required site, and are excellent in economy.
[Brief description of the drawings]
[Fig. 1] Diagram showing the installation status of the continuous underground wall [Fig. 2] Diagram showing the excavation status inside the continuous underground wall [Fig. 3] Diagram showing the construction status of the underground pond 20 [Fig. The figure which shows the construction situation of adjustment pond 20 [Figure 5] Elevated cross section of underground adjustment pond 20
9 ……… Continuous underground wall 15 ……… Bottom plate 18 ……… Rainwater pipe work 19 ……… Inflow waterway construction 20 ……… Underground adjustment reservoir 23 ……… Top plate 24 ……… Check valve 25… …… Catchment layer 29 ………… Pump pump 31 ……… Soil 33 ……… Still water layer

Claims (4)

Providing a continuous underground wall in the ground;
Excavating the interior of the continuous underground wall;
Providing a bottom plate having a check valve inside the continuous underground wall;
Comprising
A construction method for an underground storage structure, wherein the continuous underground wall and the bottom plate form an underground storage structure into which groundwater flows into the interior through the check valve . A continuous underground wall provided in the ground;
A bottom plate having a check valve excavated inside the continuous underground wall and provided inside the continuous underground wall;
Equipped with,
An underground storage structure in which groundwater flows into the inside through the check valve .   The underground storage structure according to claim 2, wherein the underground storage structure is connected to a sewer.   The underground storage structure according to claim 2, wherein a side wall is further provided inside the continuous underground wall.

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