JP2814898B2 - Underground storage facility - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground storage facility applied to an underground water dam.

[0002]

2. Description of the Related Art For example, when a dam for water use is constructed by using an underground such as a wetland, or when a pond is simply constructed, an environmental problem occurs. For this reason, the necessity of an underground dam arises. As a conventional underground water dam, as shown in FIG. 6, a tunnel-type storage tank 50 by a shield method or a concrete structure underground by excavating the ground. There is an RC storage tank 60 for producing the slag.

[0003]

However, when a storage tank is constructed with a shield tunnel or a concrete structure in the above-mentioned conventional underground as described above, floating, anti-earthquake, etc. are considered from the viewpoint of a permanent structure. However, depending on what is stored, there is an over-investment, which is problematic in terms of cost, and is a major business problem.

The present invention has been made in view of the above-mentioned circumstances, and has as its object to provide an underground storage facility capable of significantly reducing the manufacturing cost of an underground storage tank while securing necessary functions. Is to do.

[0005]

SUMMARY OF THE INVENTION The present invention is a system for storing water using voids such as crushed stones instead of building a cavity with a tunnel or concrete. Specifically, in the first invention, as shown in FIG. 1 (a) and FIG.
Drilling the ground to form a storage space, the bottom of this storage space
And lower side water blocking Engineering (such as water-barrier sheet or concrete) applied to, to fill the crushed stone such a storage space enclosed by the lower water barrier Engineering, upper water barrier Engineering (shielding to the upper surface of the crushed stone such Water sheet or concrete) to provide a water supply and drainage system that can supply and drain water between the crushed stones.
It is buried in the storage space and communicates inside and outside the storage space
By burying a possible air bleeding facility below the upper
An underground storage facility is constructed. In the second invention, FIG.
As shown in Fig. 4, the inside of the impermeable wall (retaining wall) is excavated
To form a storage space, and the bottom
After the construction (waterproof sheet or concrete)
Crushed stone in the storage space surrounded by the impermeable wall and the lower impermeable work
Crushed stones and the top
(Water impermeable sheet or concrete)
Water supply and drainage facilities that can supply and drain water between crushed stones
That can be buried inside and can communicate between the storage space and the outside.
Drainage equipment is buried under the upper impervious works and stored underground
The facility is configured .

[0006]

In the above construction, water is supplied from the outside into the storage space filled with crushed stones. The supplied water fills the voids of the crushed stones. Assuming that the volume of the storage space is V and the porosity of the crushed stone is n, a water storage amount of V × n can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. 1 (a) and 1 (b) are schematic sectional views showing an outline of the underground storage facility of the present invention, and FIGS. 2 and 3 are sectional views, plan views, and examples of a dry excavation type using a deep well. , FIG.
FIG. 2 is a cross-sectional view and a plan view showing an example of a wet excavation method using a completed leasing method.

As shown in FIGS. 1 (a), 2 and 3, a dry excavation type underground storage facility 1 includes a storage space 2 and an impermeable wall 3
And a lower water shield 4, a crushed stone 5, a water supply / drainage device 6, an upper water shield 7 and an air venting device 8.

The storage space 2 is formed by excavating the silt layer a, setting the gravel layer b to the bottom surface 2A, and forming a two-sided slope 2B on the side surface. Crushed stones 5 capable of securing a porosity n of, for example, about 0.25 to 0.37, such as debris, are put into the storage space 2.

Here, the storage space 2 has an effective volume V
However, when the effective water storage amount is W, the excavation may be performed so as to be W / n. For example, the storage space 2 is about 2000 m square, the effective storage height (H) is about 11 m, and the porosity is 0.2
Assuming that 5, a water storage of about 10 million m ³ can be obtained.

The impermeable wall 3 is a continuous underground wall (SM) without a core.
W), and drive into the alternate silt / fine sand layer c so as to surround the storage space 2, and further construct the partition partition impermeable wall 3a as necessary. The surface improvement work 9 is performed on the slope 2B.

The lower water shield 4 is a crushed stone 4A (300 m thick).
m), and concrete 4B with mesh on this
(Thickness: about 200mm), bottom surface 2A and slope 2
Install on B.

The water supply / drainage facility 6 comprises a cylindrical water supply / drainage pit 6A vertically erected in the storage space 2, and a blind water supply / drainage pipe 6B buried in the cobblestone 5 '. Blind supply and drainage pipe 6B
Is disposed at the bottom of the storage space 2 by, for example, arranging a large number of water supply and drain holes in the lower part, one end is communicated with the lower part of the water supply and drain pit 6A, water is supplied from outside to the storage space, and from the storage space to the outside. Allow drainage.

A large number of blind supply / drainage pipes 6B are provided in parallel at a pitch of, for example, about 100 m, and a supply / drainage pit 6A is provided correspondingly.

The upper impermeable member 7 is arranged at a position at a predetermined depth from the ground GL, and is provided with a water impervious sheet 7A made of rubber or the like having a thickness of about 2 mm on the protective layer 7B. Further, an air bleeding pipe 8A of the air bleeding equipment 8 is provided in the protective layer 7B. This air vent pipe 8A is for releasing the air in this gap to the outside when water is filled in the gap of the crushed stones 5, and by arranging a large number of air holes in the lower part, etc. Make the end face outside.

In the above configuration, dry construction using a deep well is performed as follows.

(1) Preparatory work is performed on the installation position of the underground storage tank.

(2) The impermeable wall 3 and, if necessary, the partition impermeable wall 3A are constructed underground.

(3) A deep well is provided inside the impermeable wall 3, and soil water inside the impermeable wall 3 is pumped up by the deep well to improve the silt layer a.

(4) The inside of the impermeable wall 3 is excavated and the storage space 2 is excavated.
To form

(5) Surface treatment 9 on the slope 2B of the storage space 2
Is applied.

(6) The crushed stone 4A is spread on the bottom surface 2A and the slope 2B of the storage space 2, and the concrete 4B is paved thereon.

(7) A blind supply / drain pipe 6B is provided on the bottom surface 2A.

(8) Crushed stones (rock debris) 5 are put into the storage space 2 in which the lower water shield 4 has been applied.

(9) The air bleeding pipe 8A is provided on the upper surface of the crushed stones 5, the protective layer 7B is laid, and the impermeable sheet 7A is laid on the protective tank 7B.

(10) The impermeable sheet 7A is covered with, for example, a 2 m covering soil 10 to restore the original shape.

In the underground storage tank 1 constructed as described above, water supply and drainage are performed as follows.

Water is supplied to the water supply / drain pit 6A from outside.

The supplied water is filled into the voids of the crushed stones 5 through the blind supply / drainage pipe 6B. At this time, the air in the gap is released to the outside by the air release pipe 8A, and the supplied water is quickly filled in the gap.

The stored water passes through the blind water supply / drainage pipe 6B and is discharged outside from the water supply / drainage pit 6A. At this time, the air is supplied from the outside by the air vent pipe 8A, and the air can be quickly discharged.

Next, the land <br/> under storage facilities 11 wet drilling formula according竣渫construction method, FIG. 1 (b), the 4, as shown in FIG. 5, the storage space 12, impervious wall 13 And the lower impermeable 14
, Crushed stones 15, water supply and drainage equipment 16, and upper water shield 17
And an air release facility 18.

The storage space 12 is formed in a rectangular parallelepiped shape by excavating the silt layer a in the impermeable wall 13, setting the gravel layer b to the bottom surface 12 A and the impermeable wall 13 to the side surface. The crushed stones 5 similar to the dry type described above are put into the storage space 12.

The impermeable wall 13 is a continuous underground wall (SMW) in which an H-shaped steel is provided at the core, which also serves as an earth retaining wall, and is driven up to the gravel layer b. Fixed to. In addition, this retaining wall is not limited to this, and may be another type.

The lower water shield 14 comprises an asphalt mat 14A (about 50 mm thick) or a civil engineering sheet laid as necessary, and an underwater concrete 14B thereon.
(About 500 mm thick), and is applied to the bottom surface 12A.

The water supply / drainage facility 16 comprises a water supply / drainage pit 16A and a blind water supply / drainage pipe 16B as in the dry type.
The upper water shield 17 also includes a water shield sheet 17A and a protective layer 17B, and an air vent pipe 18A is provided in the protective layer 17B.

In the above-described configuration, wet construction utilizing the completion leasing method is performed based on the concept of marine construction as follows.

(1) Preparatory work is performed on the installation position of the underground storage tank.

(2) The impermeable wall 13 is constructed underground.

(3) The lower part of the earth anchor 19 is a gravel layer b
And the upper part is connected to the upper end of the impermeable wall 13.

(4) The inside of the impermeable wall 13 is completed and the storage space 12
To form

(5) An asphalt mat 14A is laid on the bottom surface 12B of the storage space 12.

(6) The underwater concrete 14B is cast on the asphalt mat 14A.

(7) A blind supply / drainage pipe 16B is provided on the bottom surface 12A, and crushed stone 15 "is spread about 2 m in thickness.

(8) Crushed stones (rock debris) 15 on crushed stones 15 "
Input.

(9) An air release pipe 18A is provided on the upper surface of the crushed stones 15.
And a protective layer 17B is laid, and a water-impervious sheet 17A is laid on the protective tank 17B.

(10) For example, 2 m above the impermeable sheet 17A
And restore the original shape.

[0047]

As described above, the underground storage facility of the present invention is formed by excavating the ground, charging crushed stones into a storage space having an excavated surface, and introducing water into the voids of the crushed stones. Because it was configured to be filled, unlike conventional tunnel-type and RC-type underground storage tanks, there is no need for countermeasures against uplift or earthquakes, and most can be composed of crushed stones,
The manufacturing cost of the underground water storage tank can be significantly reduced while securing necessary functions.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an outline of an underground storage facility of the present invention. (a) shows the case where the side of the storage space is a slope, and (b) shows the case where the side of the storage space is a retaining wall.

FIG. 2 is a sectional view showing an example of a dry excavation type underground storage facility using a deep well according to the present invention.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a cross-sectional view showing an example of a wet excavation type underground storage facility according to the completion hedge method of the present invention.

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is a schematic sectional view showing a conventional underground storage tank.
(a) shows the tunnel type, and (b) shows the RC underground storage tank.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dry excavation type underground storage facility 2 ... Storage space, 2A ... Bottom, 2B ... Slope 3 ... Water barrier 3A ... Middle partition water barrier 4 ... Lower water barrier 4A ... Crushed stone, 4B ... Concrete 5 ... Crushed stones 6 ... Plumbing facilities, 6A ... Plumbing pits, 6B ... Blind plumbing pipes 7 ... Upper waterproofing work, 7A ... Waterproof sheet, 7B ... Protection tank 8 ... Air venting facilities, 8A ... Air venting pipes 9 ... Construction 10: soil covering 11: wet excavation type underground storage facility 12: storage space, 2A: bottom surface 13: impermeable wall (earth retaining wall) 14: lower impermeable wall, 14A: asphalt mat, 14
B: Underwater concrete 15: Crushed stones 16: Water supply / drainage facilities, 16A: Water supply / drainage pit, 16B: Blind water supply / drainage pipe 17 ... Pipe 19: Earth anchor 20: Cover soil

Claims (2)

(57) [Claims] 1. A form a storage space by excavating the ground, subjected to lower water-impervious Engineering on the bottom and side surfaces of the storage space, filling Then co crushed stones such surrounded by storing space in the lower water barrier Engineering
In addition , the upper surface of this crushed stone
Water supply and drainage equipment that can supply and drain water between
Air vent that can communicate between the storage space and the outside.
An underground storage facility , wherein equipment is buried under the upper impermeable structure . (2) Excavating the inside of the impermeable wall to form a storage space
The lower part of this storage space is provided
Filling crushed stones in the storage space surrounded by walls and lower impervious works
At the same time, the upper surface of this crushed stone is subjected to upper water impervious work,
Water supply and drainage equipment that can supply and drain water between the crushed stones is stored
Can be buried in the space and communicate between the storage space and the outside
Buried in the lower part of the upper impermeable construction
Underground storage facility characterized by the following.