JPH093877A - Continuous underground wall - Google Patents

Abstract

PURPOSE: To prevent the occurrence of land subsidence by a method wherein a forced feed means to feed with a pressure underground water to a ground is arranged at a first communicating means to intercommunicate an intake part and a ground and a second communicating means to feed underground water, fed with a pressure, to a drainage part is arranged. CONSTITUTION: Underground water in a confined water-bearing stratum 25 on the cutting excavation side of a continuous underground wall 10 flows through an intake part 15 by its own pressure or by the suction force of a storage pump 13 and is purified to some extent by a filter 15a and flows through a communicating pipe 16 into a communicating pipe 17. Underground water flowing through the communicating pipe 17 has mixed sand mud a part of which is settled at a sand reservoir 17a for purification. Purified underground is sucked by the storage pump 13 and fed with a pressure through a filter 14 and a communication pipe 12 to a sedimentation tank 18. Underground water from which a mud content is removed in the sedimentation tank 18 is sucked through a communication pipe 19 by a forced feed pump 20 and fed with a pressure through a communication pipe 21 to a communication pipe 22. Further, sand mixed in underground water is settled in a sand reservoir 22a and underground water flows through the communication pipe 23 and is discharged through a drainage part 24 to the confined water-bearing stratum 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous underground wall, and more particularly to a continuous underground wall provided with means for draining groundwater on the side of excavating roots to the surrounding ground side.

[0002]

2. Description of the Related Art Conventionally, when performing root cutting work, after constructing a continuous underground wall as a underground wall such as a water stop wall, an earth stop wall or a structural foundation, a deep well is deeply constructed. It is provided to drain groundwater to the ground and lower the groundwater level to improve excavation workability. Then, the groundwater discharged above the ground is discharged to the sewer for treatment, or a recharge well (condensate well) provided near the root cutting site.
Is condensing to the surrounding ground side. For example, as shown in FIG. 4, the deep well includes a casing pipe 52 embedded in the ground on the side of the excavated ground surrounded by a continuous underground wall 55, and the casing pipe 52 is a pressurized aquifer. A plurality of holes (not shown) are formed at a position facing 61, a filter 53 is provided around the plurality of holes, and a casing pipe 52 further includes a submersible pump 54 at the tip thereof. 51 is inserted and formed.
When the groundwater in the pressurized aquifer 61 is discharged by such a deep well 50, the pressurized head 60 becomes lower than the root cutting bottom surface 56 as illustrated.

[0003]

However, there are problems that the recharge well cannot be constructed when the construction site is narrow or when the continuous underground wall is provided near the site boundary. In order to solve this problem, the groundwater pumped to the ground by the deep well 50 can be flushed into the sewer for disposal. However, in this case, a new problem arises in that the sewerage charges are incurred, the construction cost is increased, and the ground is subsided around the construction site.

The present invention has been made by paying attention to the above-mentioned problems, and the purpose thereof is to reduce the groundwater level on the side of excavating roots without providing deep wells and recharge wells, and The purpose is to provide a continuous underground wall that can prevent groundwater such as from escaping to the excavation side. Another object of the present invention is to provide a continuous underground wall that can discharge groundwater on the side of excavation and does not cause ground subsidence around the construction site.

[0005]

The present invention has been made in view of the above object, and its gist is to provide an intake section provided on the root excavation side of a continuous underground wall for taking in groundwater, and the groundwater. Drainage part provided on the ground side around the continuous underground wall in order to drain water, first communication means extending to the ground by communicating with the intake part, and groundwater taken from the intake part is pumped to the ground. To communicate with the first communication means, and second communication means provided to extend from the ground to communicate groundwater pumped to the ground to the drainage section and communicate with the drainage section. It is on a continuous underground wall with and.

[0006] Another aspect of the present invention is to provide an intake section provided on the root excavation side of the continuous underground wall for taking in groundwater,
A drainage part provided on the surrounding ground side of the continuous underground wall to drain the groundwater, a direct communication means provided so as to connect the water intake part and the drainage part, and the water intake part from the drainage part Backflow prevention means provided in the communication means so that the groundwater does not flow back into the pump, and groundwater is sucked from the water intake part and the suctioned groundwater is pumped to be drained from the drainage part via the communication means. And a continuous underground wall with means.

Here, in the continuous underground wall of the present invention, in order to fill and close the direct communicating means with the fluidizing and solidifying material, the fluidized material compressing passage extending from the ground and communicating with the direct communicating means. May be provided.

[0008]

In the continuous underground wall of the present invention as set forth in claim 1, the groundwater in the confined aquifer on the root excavation side passes through the intake section by its own pressure and the suction force of the pumping means to make the first communication. Get into the means. Then, this groundwater is sucked by the pumping means, and is pumped to the ground through the first communicating means. Groundwater that has been treated on the ground, such as sludge removal, is
It is pumped inside the continuous underground wall through the second communication means,
It is discharged from the drainage section into the confined aquifer on the surrounding ground side. Then, when the construction on the root excavation side is completed, the fluidized solidifying material may be pressure-fed and filled into the communication pipe from the ground to close the communication pipe.

In the continuous underground wall of the present invention according to claim 2,
Groundwater in the confined aquifer on the side of excavation excavates directly into the communication means through the intake section due to its own pressure and the suction force of the pumping means. The groundwater that has entered the direct communication means is pumped by the pumping means, passes through the backflow prevention means, and is discharged from the drainage section to the pressurized aquifer on the surrounding ground side. When the construction on the excavation side of the root is completed, the fluidized and solidified material is pressure-fed from the ground through the pressure-feeding path, and is directly filled in the communication means to close it.
By closing the direct communication means with the fluidized material in this way, it is possible to prevent groundwater from flowing through these direct communication means into the underground space or the like built inside the continuous underground wall.

[0010]

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

FIG. 1 is a side sectional view showing a continuous underground wall of the present invention, FIG. 2 is a side sectional view showing a continuous underground wall of the invention different from FIG. 1, and FIG. 3 is a ground sectional view of FIG. It is a schematic plan view seen from the alternate long and short dash line III-III direction before placing concrete on the inner wall. In FIG. 1, the continuous underground wall 10 of the present invention includes a water intake part 15, a drain part 24, communication pipes 12, 16 and 17 as first communication means, and a pumping pump 1 as pressure feeding means.
3 and communication pipes 21, 22, 23 as second communication means
Are provided as main parts, and these main parts are arranged inside or on the side surface of the concrete wall 11.

The water intake part 15 and the drain part 24 are provided with a filter (not shown) formed by using one or more kinds of wire mesh, fiber or porous material on one surface of the flat box, and the other surface of the box. And openings 15a and 24a for fixing the communication pipes 16 and 23, respectively. Then, the water intake part 15 corresponds to the confined aquifer 25 on the side surface of the concrete wall body 11 for taking in groundwater on the root excavation side and the drainage part 24 for discharging groundwater to the surrounding ground side. Along with being installed at the height, the filtration membrane has an aquifer 25 under pressure.
It is provided so as to abut. Further, the intake part 15 and the drain part 24 may be provided in different elements forming the continuous underground wall 12 as shown in FIG. 1, or may be provided in the same element (not shown). good.

The communicating pipes 16, 17 and 12 are provided inside the concrete wall 11, and the communicating pipe 16 has one end connected to the opening 15a of the water portion so as to extend in the horizontal direction, and the other end of the communicating pipe 16 is connected. Is connected to the upper end of a communication pipe 17 extending in the vertical direction, and further connected to the upper end of the communication pipe 17 is a communication pipe 12 that extends to the ground and communicates with a settling tank 18.
Here, the settling tank 18 is arranged on the ground in the construction site and used for precipitating and purifying the sand and mud mixed in the pumped groundwater. Further, the communication pipe 17 is provided with a dead end pipe line below the connection portion with the communication pipe 16 and serves as a sand reservoir 17a. That is, the water intake unit 15
The sand and mud that has entered the inside of the communication pipes 16 and 17 through the filter membrane of the
The pumping pump 13 which will be described later will not be clogged up by being accumulated in a. Further, the pumping pump 13 is arranged at an upper end portion inside the communication pipe 17, and a filter 14 is provided below the pumping pump 13.
Is provided.

The communication pipes 21, 22 and 23 are provided inside the concrete wall 11, and the communication pipe 23 has one end connected to the opening 24a of the drainage portion 24 so as to extend in the horizontal direction.
The other end of the communication pipe 23 is connected to an intermediate portion of the communication pipe 22 extending in the vertical direction, and the communication pipe 12 extending to the ground is connected to the upper end of the communication pipe 22. Communication pipe 22 here
Similarly to the communication pipe 17, is provided with a dead end pipe line below the connecting portion with the communication pipe 23, which is referred to as a sand pool 22a.

In addition to the above-mentioned main parts, in the present invention, a communication pipe 19 for connecting the settling tank 18 and the communication pipe 21 and a ground water from the settling tank 18 is provided at an end or in the middle of the communication pipe 19. It is also possible to use a pressure-feeding pump 20 for pressure-feeding into the surrounding ground again.

Next, the operation of discharging the groundwater on the excavating side to the surrounding ground side by the continuous underground wall 10 having the above-mentioned structure will be described with reference to FIG. The groundwater in the confined aquifer 25 on the root excavation side passes through the water intake section 15 due to its own pressure and the suction force of the pumping pump 13, and this filter 15
After being purified to some extent by a, the communication pipe 17 is connected via the communication pipe 16.
Get in. At this time, the groundwater that has entered the communication pipe 17 is purified by part of the mixed sand and mud settling in the sand pool 17a, while the purified groundwater is sucked by the pumping pump 13 and passed through the filter 14. Through the communication pipe 12 to the sedimentation tank 18 on the ground.

The groundwater from which mud has been removed in the settling tank 18 is
It is sucked by the pressure feed pump 20 through the communication pipe 19, and is pressure-fed inside the concrete wall body 12 through the communication pipe 21 to reach the communication pipe 22. In this communication pipe 22, the sand mixed in the groundwater settles in the sand pool 22a to purify the groundwater, and this groundwater is discharged from the drainage part 24 through the communication pipe 23 to the confined aquifer 25 on the surrounding ground side. .

After completion of the construction on the root excavation side, the fluidized and solidified material is pressure-fed from the ground through the communicating pipes 12 and 21,
The communicating pipes 16, 17 and the communicating pipes 22, 23 are filled with a fluidized solidifying material, and these communicating pipes 16, 17, 22, 2
3 may be closed.

Next, the structure of the continuous underground wall 30 different from the continuous underground wall 10 shown in FIG. 1 will be described with reference to FIGS. 2, the continuous underground wall 30 of the present invention
Includes a water intake part 33, a drain part 40, communication pipes 34, 35, 38, 42, 41 as direct communication means, a check valve 39 as backflow prevention means, and a pressure feed pump 36 as pressure feed means. It is provided as a main part, and these main parts are arranged inside or on the side surface of the concrete wall body 31.

The intake part 33 and the drain part 40 are shown in FIG.
The concrete wall 3 is formed by the same structure as the intake part 15 and the drain part 24 described in 1.
1 is provided. However, the intake part 33 and the drain part 4
0 is provided in the same element that constitutes the continuous underground wall 30 as shown in FIGS. 2 and 3.

Further, the communication pipes 34, 35 and 41, 42
Are formed by the same structure as the communication pipes 16, 17 and 23, 22 described in FIG. 1, respectively.
A pressure pump 36 is similarly arranged at the upper end of the inside of 5,
A filter 37 is provided below it. However, the communication pipes 12 and 21 extending to the ground as shown in FIG. 1 are not arranged, but a communication pipe 38 for directly communicating these is connected to the upper ends of the communication pipes 35 and 42 in FIG.

Further, a check valve 39, that is, a valve for the ground water flowing from the intake part 33 to the drain part 40, is opened in the communication pipe 38 and is allowed to pass therethrough. For this reason, a valve will be installed so that groundwater cannot pass through.

In addition to the above-mentioned main parts, in the present invention, a communication pipe 32 is provided which has one end connected to the communication pipe 34 and extends to the ground. The communicating pipe 32 is made of non-shrinkable mortar, expansive mortar, cement slurry, fluidized solidifying material such as epoxy resin or urethane resin from the ground.
8, 42, 41 are pressure-fed, and these communication pipes 34, 35,
It is used as a pressure-feeding path for the fluidized and solidified material when the fluidized and solidified material is filled in 38, 42, and 41 to close it. When the communication pipe 32 is connected to the communication pipe 34, the fluidized and solidified material reaching the communication pipe 34 through the communication pipe 32 is transferred to the communication pipes 38, 42,
The pumping pump 36 can be used when pumping to 41.

Next, the operation of discharging groundwater on the excavation side to the surrounding ground side by the continuous underground wall 30 having the above-mentioned structure will be described with reference to FIG. The groundwater in the confined aquifer 45 on the root excavation side passes through the intake part 33 due to its own pressure and the suction force of the pumping pump 36, and this filter 33
After being purified to some extent by a, the communication pipe 35 is passed through the communication pipe 34.
Get in. At this time, the groundwater that has entered the communication pipe 35 is purified by part of the mixed sand and mud settling in the sand pool 35a, while the purified groundwater is sucked by the pump pump 36 and passed through the filter 37. Then, it is pressure-fed to the communication pipe 42 through the communication pipe 38. At this time, the check valve 39 opens its valve to allow passage of groundwater. Communication pipe 42
In the groundwater that has reached, the mixed sand and mud settles in the sand pool 42 and is purified, and is discharged from the drainage section 40 to the confined aquifer 45 on the surrounding ground side through the communication pipe 42.

When the construction on the excavation side is completed, the fluidized and solidified material is pressure-fed from the ground through the communication pipe 32, and the communication pipes 34, 35, 38, 42, 41 are successively filled with these communication pipes. Close. In this way, the fluidized solidification material is used as the communication pipes 34, 3
By closing 5, 38, 42 and 41, it is possible to prevent groundwater from passing through these communication pipes and infiltrating the underground space or the like built inside the continuous underground wall.

[0026]

In the continuous underground wall of the present invention, the intake part for taking in groundwater is provided on the root excavation side, the drainage part for draining groundwater is provided on the surrounding ground side, and the continuous underground wall is provided with the pumping means. The second communication means was provided so as to extend from the ground and communicate with the drainage section in order to communicate the first communication means to the water supply section and extend it to the ground, and to send the groundwater pumped to the ground to the drainage section. Therefore, the groundwater on the root excavation side can be sent to the surrounding ground side without providing a deep well or a recharge well, and the groundwater level on the root excavation side can be lowered. Therefore, even if the groundwater on the excavation side is discharged, it is possible to prevent ground subsidence around the construction site.

Further, in the continuous underground wall of the present invention, the water intake section is provided on the root excavation side and the drainage section is provided on the surrounding ground side, and the water intake section and the drainage section are directly communicated with each other by the direct communication means. In order to prevent the backflow of groundwater to the ground, the backflow prevention means was installed in the direct communication means and the pumping means was installed in the direct communication means. Then, it can be passed through the direct communication means to the drainage portion, and drained from the drainage portion to the surrounding ground side. Therefore, the groundwater level on the excavation side can be lowered without providing a deep well or a recharge well, and ground subsidence around the construction site can be prevented even if the groundwater on the excavation side is discharged.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a continuous underground wall of the present invention.

FIG. 2 is a side sectional view showing a continuous underground wall of the invention different from FIG.

FIG. 3 is a schematic plan view of the underground wall of FIG. 2 as seen from the direction of alternate long and short dash line III-III before placing concrete.

FIG. 4 is a schematic cross-sectional view showing a state in which a deep well is provided on the excavated ground side surrounded by a continuous underground wall at a root cutting work site.

[Explanation of symbols]

10 continuous underground wall 12, 16, 17 communication pipe (first communication means) 13 pumping pump (pressure feeding means) 15 water intake part 21, 22, 23 communication pipe (second communication means) 24 drainage part 30 continuous underground Wall 33 Water intake part 34, 35, 38, 41, 42 Communication pipe (direct communication means) 36 Pressure feed pump (pressure feed means) 40 Drainage part

Claims (3)

[Claims] 1. A water intake part provided on the root excavation side of the continuous underground wall for taking in groundwater, and a drain part provided on the surrounding ground side of the continuous underground wall for draining the groundwater, First communication means communicating with the intake part and extending to the ground, pumping means provided in the first communication means for pumping the groundwater taken from the intake part to the ground, and groundwater pumped to the ground A continuous underground wall extending from the ground so as to communicate with the drainage section, the second communicating means being provided so as to communicate with the drainage section. 2. An intake part provided on the root excavation side of the continuous underground wall for taking in groundwater, and a drain part provided on the surrounding ground side of the continuous underground wall for discharging the groundwater, Direct communication means provided so as to communicate between the water intake part and the drainage part, backflow prevention means provided in the communication part so that groundwater does not flow backward from the drainage part to the water intake part, and groundwater from the water intake part And a pumping means for pumping the sucked groundwater to drain it from the drainage part through the communicating means. 3. The continuous underground according to claim 2, further comprising a pressure-feeding channel for the fluidized and solidified material that extends from the ground and communicates with the direct communication means, in order to fill and close the fluidized and solidified material in the direct communication means. wall.