JP3451564B2 - Underground water supply method and underground water supply equipment - 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 water supply method and an underground water supply apparatus, and more particularly, to an underground water supply method and an underground water supply method that enable the flow of ground water after constructing a waterproof underground wall. It relates to the device.

[0002]

2. Description of the Related Art As is well known, when constructing an underground structure, for example, an underground tunnel for a subway or a dedicated road for vehicles by an excavation method, it is possible to prevent the ground from collapsing and excavate the interior. In order to achieve this, an underground wall with a water stop is constructed.

Various methods are provided for constructing this type of underground wall, including the continuous underground wall method, but the continuous underground wall method and the column wall method are used. The underground wall may be left in the ground even after the main body of the underground structure is constructed.

By the way, if the underground wall provided with waterproofing is left in the ground, the groundwater flow is blocked, and the water vein on the downstream side of the underground wall is cut off. However, inconvenience such as the subsidence of the ground occurs.

Therefore, for example, in Japanese Unexamined Patent Publication No. 6-49839, it is possible to secure water-stopping when constructing the main body of an underground structure and ensure water permeability when the main body is completed. A wall construction method is disclosed.

In the construction method disclosed in this publication, the underground wall is constructed by the continuous underground wall construction method. When the underground wall is constructed, a hollow circle or a square shape is present in the excavation hole. A hole tube or a special water-permeable frame in which a steel mesh is placed in the ground side opening is installed in the vertical direction, and an impermeable and stretchable tubular body is inserted into this water-permeable frame. Concrete is poured in a state where the water pressure inside the tubular body is higher than the surrounding water pressure, and after the concrete has hardened, the tubular body is removed from the special water passage frame, and a perforated pipe or natural side opening Water permeability is given to the underground wall by the steel mesh placed in the section.

The special water-passing frame is sized to penetrate the underground wall in the thickness direction or to partially replace the underground wall in the thickness direction, and the inside thereof is filled with crushed stone. It However, such a conventional underground water supply method and a water supply device therefor have the following technical problems.

[0008]

That is, in the underground water supply method of the above publication, in order to impart water permeability to the underground wall,
Since the whole or part of the underground wall in the thickness direction is replaced with the special frame over the entire length in the depth direction, this part may become a structural weak point.

In the method disclosed in this publication,
Since the drilling Kezumizonai muddy water is filled Tatekomu and perforated tube, with mud film is deposited in the through hole of the perforated tubes, with there is a risk of clogging, when the concrete is Has a tubular body inserted inside it to prevent concrete from wrapping around, but since this tubular body is inserted inside the water-passing frame such as a perforated pipe, In the through hole,
There is also a risk that cement or the like will enter and cause clogging, and the water permeability of the underground wall will decrease.

The present invention has been made in view of such conventional problems, and the object thereof is not to become a structural weak point and to sufficiently pass water through the underground wall. It is to provide an underground water supply method and an underground water supply device that can be secured.

[0011]

In order to achieve the above object, the present invention is directed to a pair of water-blocking underground walls facing each other at a predetermined interval so as to block an underground waterway. In the underground waterway construction method of forming a waterway for communicating between the underground waterways after the formation of the underground wall, the waterway is a waterway formed between the underground walls, and in the underground wall. Formed, consisting of an introduction and derivation part of groundwater that communicates with the water conduit, the introduction and derivation part, when constructing the underground wall, corresponding to the formation position of the water conduit, the ground side The opening is made of a hard synthetic resin with a wraparound prevention sheet attached to the outer peripheral edge and a large number of voids.
Core, metal net provided around the core, woven cloth
And a filter material consisting of
And a biodegradable resin sheet surrounding the sheet.
The steel cylinder, which is closed by a water-permeable mat whose water permeability is restored by decomposition , the opening on the excavation side is closed by the inner end plate, and whose both ends are approximately the same length as the thickness of the underground wall, is opened. Formed by embedding in the transverse direction of the underground wall,
The sheet is decomposed and removed by the mold, bacteria, and microorganisms existing in the ground on the side of the natural ground to restore the water permeability of the water permeable mat, and the interior is excavated after the underground wall is constructed, The water conduit is formed so that the introduction part and the extraction part are in communication with each other. According to the underground water flow method constructed in this way, the opening on the ground side of the steel cylinder is provided with a wraparound prevention sheet at the periphery, and the water permeability is restored by the decomposition of the biodegradable resin sheet. Since it is blocked by the permeable mat, concrete is prevented from wrapping around the permeable mat side, the permeable mat comes into direct contact with the ground, and biodegradable resin due to microorganisms, bacteria, mold, etc. existing in the ground. The sheet can be disassembled and removed. When the biodegradable resin sheet with which the water permeable mat is filled is removed, the water permeability of the water permeable mat is restored, and a water passage that connects the opposing water blocking underground walls is formed. Since the steel cylinder whose ground side is closed by the water-permeable mat is buried in the cross-sectional direction of the underground wall, this portion does not become a structural weak point. In this case, high-pressure water can be injected into the steel cylinder until the water conduit is formed in the steel cylinder, and the high-pressure water can be discharged after forming the water conduit. . According to this structure, the soil water pressure applied to the steel cylinder can be countered by the high-pressure water, so that the water passage can be formed at a large depth. Further, the steel cylinder may be filled with a lumpy water permeable material such as crushed stone or gravel. With this configuration, it is possible to counter the earth pressure applied to the steel cylinder regardless of the injection and discharge of the high-pressure water, and it is possible to form the water passage at a large depth with a simple configuration. Furthermore, in order to achieve the above-mentioned object, the present invention provides a pair of water-blocking underground walls that are opposed to each other with a predetermined interval formed so as to block an underground waterway, and form the underground wall. In an underground water passage device that later forms a water passage that connects between the underground water passages, the water passage is formed in the underground wall and a water guide passage formed between the underground walls,
A groundwater introduction and derivation part communicating with the water conduit is provided, and the introduction and derivation part is buried in a transverse direction of the underground wall corresponding to the formation position of the water conduit, and the thickness of the underground wall. Biodegradation by closing a steel cylinder having the same length with both ends open and the ground side opening of the steel cylinder.
Has a permeability mat permeability is restored, the a water permeation mat peripheral preventing sheet sneak annexed to the, and an inner end plate for closing the opening of the excavation side of the steel tubular member by the permeability
The mat is made of hard synthetic resin with many voids.
Core, and metal nets and weaves provided around the core
Place the filter material made of cloth and the outer periphery of the filter material.
It is composed of a biodegradable resin sheet surrounding it . According to this configuration, as in the groundwater water flow method, manufactured by biodegradable resin
By disintegrating and removing the sheet , the water permeability of the water permeable mat is restored, and a water passage that penetrates between the opposing water blocking underground walls is formed . The introduction and derivation sections have outer end plates arranged inside the water-permeable mat, and the inner and outer end plates are composed of a large number of square plate pieces, and the outer peripheral edges of the plate pieces are mutually connected. It is possible to assemble it into a flat plate by fitting it to. According to this configuration, when the water permeability of the water permeable mat is restored, external pressure acts on the inner and outer end plates, and this outer pressure can decompose each end plate into a large number of plate pieces. The inner and outer end plates may be assembled in a flat plate shape, and the outer periphery thereof may be surrounded by a biodegradable resin sheet or a paper sheet. According to this configuration, the shape of the end plate composed of a combination of a large number of plate pieces can be retained, the handling becomes easy, and when the water permeability of the water permeable mat is restored, the sheet is treated with ground water or microorganisms. It can be dissolved or decomposed and removed.

[0012]

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1
7 to 7 show a first embodiment of the underground water supply method and the underground water supply device according to the present invention.

In the construction method and apparatus shown in the same figure, a pair of water-blocking underground walls 10 are formed opposite to each other at a predetermined interval.
Is formed so as to block the underground water channel in the ground, and after the underground wall 10 is constructed, the water channel 12 that connects the underground water channels is formed.

In the case of the present embodiment, the underground wall 10 is constructed by the underground continuous wall construction method, and after the grooved excavation hole is excavated and formed in the ground, the rebar cage 14 is installed and then the concrete is removed. When cast, a continuous water-blocking wall is formed.

After constructing the underground wall 10, the interior surrounded by the underground wall 10 is excavated, and the building structure 16 is provided between the underground walls 10.
The basement floor 18 from 1F to 3F is constructed.

The water conduit 12 is composed of a water conduit 20 formed between the underground walls 10, and an introduction part 22 and an outlet part 24 of groundwater formed in the underground wall 10. Is located on the upstream side of the groundwater channel, and the lead-out portion 24 is located on the downstream side of the groundwater channel.

The introduction and derivation parts 22 and 24 are formed on both ends of the water conduit 20 so as to communicate with the ends of the water conduit 20, respectively. In the case of the present embodiment, the water conduit 20 is formed in a hollow shape having a substantially rectangular longitudinal section, and the underground wall 1
It extends in a substantially horizontal direction so as to be orthogonal to 0, and the underground wall 10
A plurality of them are arranged at predetermined intervals along the longitudinal direction of.

In this embodiment, the introducing and deriving sections 22 and 24 have the same structure. Therefore, only one introducing section 22 will be described below. Introductory part 2
2 is a steel cylinder 22a and a wraparound prevention sheet 22b
, Water permeable mat 22c, inner end plate 22d, and outer end plate 22e
And have.

The steel cylinder 22a is a rectangular cylinder having a length substantially the same as the thickness of the underground wall 10 and open at both ends, and is made of a steel plate having a predetermined thickness. When constructing the underground wall 10, this steel cylinder 22a is locked by the rebar cage 14 in correspondence with the formation position of the water conduit 20, and the openings at both ends face the natural rock side and the excavation side, respectively. In this way, it is buried in the transverse direction of the underground wall 10.

The sectional shape of the steel tubular body 22a is not limited to the rectangular shape, and may be a circular shape, an elliptical shape, a polygonal shape or the like as long as the outer periphery is closed. Water-permeable mat 2
Reference numeral 2c closes the opening of the steel cylinder 22a on the side of the natural rock, and has a sufficient area to cover the opening of the steel cylinder 22a.

The water-permeable mat 22c of this embodiment has a core 220c and a core 220c , as shown in detail in FIG.
a filter material 222c surrounding the outer circumference of c, and a filter
-Biodegradable resin sheet surrounding the outer circumference of the material 222c
And 222d.

The water permeable mat 22c is originally water permeable because a large number of voids are formed in the core 220c, but in the case of the present embodiment, the outer periphery of the filter material 222c.
Is surrounded by a biodegradable resin sheet 222d.
In this state, there is no water permeability.

As a more specific structure of the water-permeable mat 22c, for example, the mat body is made of Cosmogio (manufactured by Toyobo Co., Ltd .: trade name), and the biodegradable resin 221c is made of super paper (Shin-Etsu Polymer Co., Ltd.). Manufacturing: trade name) can be used.

[0024] The biodegradable resin sheet 222d is, bacteria, is decomposed by microorganisms, such as mold.

The decomposition rate at this time can be adjusted by adjusting the kind and amount of the additive. Also, this degradation rate is faster because the less soil the microbial food eats. In the case of the present embodiment, the properties of the soil around the position where the water passage 12 is formed, the construction period of the underground wall 10,
Considering the period of root cutting and excavation, etc., the biodegradable resin is used so that the water permeability is restored when the formation of the water conduit 20 is completed.
The thickness of the sheet 222d may be set.

When there are few microorganisms decomposing the biodegradable resin sheet 222d in the soil around the position where the water passage 12 is formed, the microorganisms are passed through the hose 26 described later to form a steel cylinder. The biodegradable resin sheet 222d or the sheet 221e may be supplied from the inside of the body 22a and decomposed from the inside.

As shown in FIG. 3, a steel frame 22f is attached to the outer peripheral edge of the water permeable mat 22c so as to surround the four circumferences of the water permeable mat 22c to protect the water permeable mat 22c.

Further, on the outer peripheral edge of the steel frame 22f,
A wraparound prevention sheet 22b is attached to the four circumferences of the frame body 22f so as to surround the frame body 22f. This sheet 22b
Is a flexible material such as a rubber sheet, and when pouring concrete, it closely contacts the ground side wall surface of the excavation hole and prevents the concrete from wrapping around to the outer surface side of the water permeable mat 22c. .

The water-permeable mat 22c constructed as described above
Locks the steel frame 22f to the rebar cage 14 to form the rebar cage 14 inside the excavation hole when the underground wall 10 is formed.
Built with.

On the other hand, the inner end plate 22d is fixed to the opening edge of the tubular body 22a so as to close the opening on the excavation side of the steel tubular body 22a. Further, the outer end plate 22e is the water permeable mat 2
It is arranged inside 2c and is fixed to the opening edge of the steel cylinder 22a.

In the case of this embodiment, the inner and outer end plates 22d,
22e have the same structure, and one outer end plate 22e is shown in detail in FIG. The outer end plate 22e shown in the figure includes a large number of square plate pieces 220e,
It is composed of a biodegradable resin sheet 221e.

The plate pieces 220e are made of, for example, wood or paper, and on the outer peripheral edge of the four circumferences of each plate piece 220e, a groove 222e and a protrusion 223e which can be fitted to adjacent parts are provided.
Is provided.

The plate piece 220e is assembled in a flat plate shape by fitting the outer peripheral edges thereof to each other, and the outer periphery thereof is surrounded by the biodegradable resin sheet 221e. When the plate piece 220e is surrounded by the sheet 221e, it becomes easy to handle when it is attached to the steel tubular body 22a.

Each end plate 22 assembled in this way
The outer peripheral edges of d and 22e are fixed to the open ends of the steel cylinder 22a. End plates 22d and 22e and water permeable mat 2
When 2c and 2c are arranged as described above, the inside of the steel tubular body 22a is closed.

A hose 26 for injecting and discharging high-pressure water is extended to the ground side inside the steel cylinder 22a thus closed. Next, a method of constructing the underground water supply device having the above configuration will be described.

In constructing the underground water passage device, first, the underground wall 1
The steel cylinder 22a forming the introduction and derivation parts 22 and 24 is locked to the rebar cage 14 used when forming 0,
It is built in the excavation hole together with the rebar cage 14 and concrete is placed.

The locked state at this time is shown in FIG.
When concrete is poured into the borehole to form the underground wall 10, the concrete flows in the borehole,
Although it tries to wrap around to the outer surface side of the water permeable mat 22c, since the wrap-around prevention sheet 22b that is in close contact with the excavation wall surface on the natural side is provided on the outer peripheral edge of the water permeable mat 22c, this wrap-around is prevented. As a result, the outer surface of the water permeable mat 22c comes into direct contact with the earth and sand of the natural ground.

The placed concrete hardens and the underground wall 1
When 0 is formed, root cutting excavation is performed between the underground walls 10, and the water conduit 20 is formed on the root cutting excavating surface. When forming the water conduit 20, the inner surface of the underground wall 10 is slightly shaved to expose the inner end plate 22d and the water conduit 20 is formed between the exposed inner end plates 22d.

In the case of this embodiment, until the underground wall 10 is formed by pouring concrete and the water conduit 20 is formed, high pressure is applied to the inside of the steel cylinder 22a through the hose 26. Water is introduced to maintain the steel tubular body 22a so as not to be crushed by external pressure, and after forming the water conduit 20, the high pressure water inside is drained through the hose 26.

When the formation of the water conduit 20 is completed, the basement floor 18 is formed above it. In the progress process of such construction, the water-permeable mat 22c is in contact with the earth and sand on the natural ground side, so the biodegradable resin sheet of the water-permeable mat 22c is used.
222d is gradually decomposed.

When the biodegradable resin sheet 222d is completely decomposed and removed, the water permeability of the water permeable mat 22c is restored. When the water permeability of the water permeable mat 22c is restored,
Surrounding external pressure acts on the inner and outer end plates 22d and 22e, and the inner and outer end plates 22d,
22e is decomposed into a large number of plate pieces 220e, and the water conduit 20
And the introduction unit 22 and the derivation unit 24 communicate with each other.

When the inlet / outlet sections 22, 24 and the headrace 20 communicate with each other, the groundwater channels which are blocked by the waterproof underground wall 10 are pierced by the waterway 12, and the groundwater passes through the waterway 12. To the downstream side.

According to the underground water supply method and the underground water supply device configured as described above, the steel cylinder 22a whose ground side is closed by the water permeable mat 22c is formed in the cross-sectional direction of the underground wall 10. Since it is buried in, this part does not become a structural weak point.

In this case, the water conduit 2 is provided in the steel cylinder 22a.
While high pressure water is injected until 0 is formed,
Since the high-pressure water is discharged after the water conduit 20 is formed, the earth pressure applied to the steel cylinder 22a can be countered by the high-pressure water, and the water conduit 12 can be formed at a large depth.

[0045]

[0046]

[0047]

[0048] Figure 7 shows a second actual施例underground water flow method and groundwater water passage device according to the present invention, in the above embodiment the same or corresponding parts are denoted by the same reference numerals thereof Description will be omitted, and only the characteristic points will be described below.

In the embodiment shown in the figure, the inner and outer end plates 22 are
The steel tubular body 22a closed by d and 22e is filled with a massive water-permeable material 28 such as crushed stone or gravel, whereby the steel tubular body 2
The external force applied to 2a is counteracted.

In the case of this embodiment, the outer end plate 22e shown in the first embodiment is removed and only the inner end plate 22d is provided. The inner end plate 22d is made of, for example, a steel plate, and the inner end plate 2 is formed when the water conduit 20 is formed and when the water conduit 20 is communicated with the introduction and outlet portions 22 and 24.
2d should be removed.

In the case of this embodiment, the water conduit 20
Packed with a net bag filled with crushed stone or gravel,
Alternatively, a perforated tube may be installed.

When the above configuration is adopted, injection of high pressure water,
Regardless of the discharge, the soil water pressure applied to the steel cylinder 22a can be countered, and the water passage can be formed at a large depth with a simple structure.

In the above embodiment, the water permeable mat 22c
Although the case where the outer end plate 22e is arranged inside is illustrated, the outer end plate 22e is not always necessary, for example, when the formation position of the water passage 20 is relatively shallow.

Further, in the above embodiment, the inner and outer end plates 22 are
d and 22e are a large number of plate pieces 220e assembled in a flat plate shape,
Although the outer periphery of which is surrounded by the biodegradable resin sheet 221e is used, it is not necessarily limited to this configuration. For example, if the diameter of the water conduit 20 is large enough for a worker to insert, Both the inner end plate 22d or the inner and outer end plates 22d and 22e are made of steel plates, and when the water conduit 20 is formed, these end plates 22d and 22e are removed,
The introduction part 22 and the derivation part 24 may be connected to the water conduit 20.

Furthermore, the formation position of the headrace 20 is not limited to the basement 18 downward, and the headrace 20 may be provided inside the beam that defines the basement 18, for example.

[0056]

As described above in detail in the embodiments,
According to the underground water supply method and the underground water supply device according to the present invention, it is possible to sufficiently secure the water permeability of the underground wall without becoming a structural weak point.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a first embodiment of an underground water supply method and an underground water supply device according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a cross-sectional explanatory view of a main part of FIG.

FIG. 4 is an explanatory diagram of a water-permeable mat used in the present invention.

FIG. 5 is a perspective view for explaining the inner and outer end plates used in the present invention.

FIG. 6 is an explanatory view showing a state in which the water passing device according to the present invention is attached to a reinforcing bar cage.

FIG. 7 shows an underground water supply method and a water supply device according to the present invention .
It is an important section sectional view showing other examples.

Continued front page       (56) References JP-A-8-3982 (JP, A)                 JP-A-7-268863 (JP, A)                 JP-A-49-112435 (JP, A)                 JP-A-9-88081 (JP, A)                 Japanese Patent Laid-Open No. 5-311643 (JP, A)                 JP-A-6-49839 (JP, A)

Claims (6)

(57) [Claims] 1. A pair of water-blocking underground walls, which are opposed to each other with a predetermined space therebetween, are formed so as to block an underground water channel in the ground, and a communication for connecting the underground water channels is formed after the underground wall is formed. In the underground waterway construction method for forming a waterway, the waterway is a waterway formed between the underground walls, and an introduction and a derivation part of groundwater that is formed in the underground wall and communicates with the waterway. made, the introduction and deriving unit, when establishing the underground wall, said to correspond to formation positions of the water conduit, the opening of the earth mountain is sneak prevention sheet is attached to the outer periphery, a number A core made of hard synthetic resin in which voids are formed,
Made of metal net and woven cloth provided on the outer circumference of this core
The filter material and the raw material surrounding the outer periphery of the filter material
And a biodegradable resin sheet.
The pipe is closed with a water-permeable mat that restores water permeability, the opening on the excavation side is closed with an inner end plate, and a steel cylinder with both ends that is approximately the same length as the underground wall is opened. Formed by embedding in the transverse direction of the inner wall, the sheet is decomposed and removed by the mold, bacteria and microorganisms existing in the ground on the ground side, and the water permeability of the water permeable mat is restored, and An underground water-passing method, characterized in that after constructing an underground wall, the inside is excavated to form the water conduit to connect the introduction part and the derivation part. 2. High-pressure water is injected into the steel cylinder until the water conduit is formed in the steel cylinder, and the high-pressure water is discharged after the water conduit is formed. The underground water supply method according to claim 1, wherein 3. The water-passing method according to claim 1, wherein the steel cylinder is filled with a massive water-permeable material such as crushed stone or gravel. 4. A pair of water-blocking underground walls, which are opposed to each other at a predetermined interval, are formed so as to block an underground water channel in the ground, and a communication for connecting the underground water channels is formed after the underground wall is formed. In the underground water passage device that forms a water channel, the water channel is a water channel formed between the underground walls, and an introduction and a derivation portion of ground water that is formed in the underground wall and communicates with the water channel. The introduction and derivation parts are made of steel and are buried in the transverse direction of the underground wall in correspondence with the formation positions of the water conduits, and are open at both ends and have a length substantially the same as the thickness of the underground wall. The tubular body and the opening of the steel tubular body on the ground side are closed, and biodegradation is used to make the
A water- permeable mat that water is restored, a sneak-prevention sheet attached to the periphery of the water-permeable mat, and an inner end plate that closes the opening on the excavation side of the steel cylinder, the water-permeable mat, Hard synthetic tree with many voids
A core made of fat and a metal net provided around the core.
Filter material made of cloth and woven cloth, and the filter material
An underground water supply device comprising a biodegradable resin sheet surrounding the outer periphery of the . 5. The introducing and deriving section is provided with the water permeability map.
Has an outer end plate disposed on the inner side of the box, and the inner and outer end plates are composed of a large number of square plate pieces.
Then, the outer peripheral edges of the plate pieces are fitted together and assembled into a flat plate shape.
The underground water supply device according to claim 4, wherein: 6. The inner and outer end plates are assembled in a flat plate shape,
Wrap the outer circumference with a biodegradable resin sheet or paper sheet.
The underground water supply device according to claim 5, which is enclosed.