JP3750088B2 - Permeable continuous underground wall structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water-permeable continuous underground wall structure.
[0002]
[Prior art]
As a technology to secure the groundwater flow when the continuous underground wall is constructed, a continuous water passage is installed in the continuous underground wall without blocking the groundwater flow by installing a water passage at the position where the groundwater flow exists on the continuous underground wall. Techniques for passing through walls are known.
[0003]
[Problems to be solved by the invention]
However, even if a water channel is provided in the middle of the continuous underground wall, a mud film adheres between the continuous underground wall and the wall surface of the excavation groove, and the water channel is blocked. There was found.
For this reason, even if a water pipe is provided in the middle of the continuous underground wall, sufficient water flow cannot be obtained, and as a result, the groundwater flow is not changed.
Therefore, upstream of the groundwater flow, adverse effects on the environment such as groundwater rise, spring water, generation of house moisture and mold, inundation into the basement, and changes in vegetation occur.
In addition, adverse effects on the environment such as well drowning, water rot, ground subsidence due to lower groundwater level, and changes in vegetation occur on the downstream side.
The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to destroy the mud film blocking the water passage and to construct the continuous underground wall even if it is the same as the groundwater flow. An object of the present invention is to provide a continuous water-permeable underground wall structure for ensuring a certain level of water permeability.
[0004]
[Means for Solving the Problems]
The present invention provides a continuous underground wall in which a water passage communicating from one side surface to the other side surface is provided to allow passage of groundwater flow, and a water permeable member is disposed between the opening of the water passage and the ground. The water-permeable continuous underground wall structure is characterized in that an injection device capable of removing the mud film adhering to the surface of the water-permeable member and the wall surface of the excavation groove by injecting water or a solution is provided. .
Further, the present invention provides the water-permeable continuous underground wall structure described above, wherein the spray device includes an outer tube having a slit in an axial direction of a circumferential surface disposed from the ground portion to the water-permeable member, and the housing accommodated in the outer tube. A water-permeable continuous underground wall structure characterized by comprising an inner tube having a nozzle capable of jetting water or a solution from a slit of the outer tube.
Further, the present invention is characterized in that, in the water-permeable continuous underground wall structure described above, the nozzle of the inner tube and the slit of the outer tube are positioned toward the outside of the continuous underground wall with the water-permeable member as the back. It is a water-permeable continuous underground wall structure.
Further, the present invention is the water-permeable continuous underground wall structure according to any one of the water-permeable continuous underground wall structures described above, wherein the inner pipe is installed so as to be movable up and down in the outer pipe. .
Furthermore, the present invention provides any one of the water-permeable continuous underground wall structures described above, including a pipe body that allows a fluid to reach the water-permeable member from the above-ground part and muddy water contained in the water-permeable member. It is a water-permeable continuous underground wall structure characterized by arranging a pipe body to be discharged to the ground.
[0005]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings.
[0006]
<A> Overall configuration As shown in FIGS. 1 and 2, the water-permeable continuous underground wall structure 1 includes a sheet 3 facing the wall surface 2 of the excavation groove, and a water passage 4 disposed between the sheets 3 and 3. The permeable member 41 arranged so as to cover the upstream side opening of the underground water flow 5 in the water passage 4, and the sheets 3 and 3 are filled with concrete so that the sheets 3 and 3, the water permeable member 41 and the water pipe 42 are excavated. In the continuous underground wall 6 constructed in close contact with the wall surface 2, an outer pipe 7 disposed in the vertical direction between the outer side surface of the continuous underground wall 6 on the upstream side of the groundwater flow 5 and the wall surface 2 of the excavation groove, The injection device 8 accommodated in the outer pipe 7 and the muddy water replacement tubular body 9 disposed in the vertical direction between the continuous underground wall 6 and the water permeable member 41 of the water passage 4 are configured.
[0007]
<B> Waterway As shown in FIGS. 1 and 2, the waterway 4 is provided across the middle of the continuous underground wall 6 at the same level as the groundwater flow 5.
Specifically, the water pipe 42 that penetrates the continuous underground wall 6 and the water permeable member 41 that covers the upstream side opening of the ground water flow 5 of the water pipe 42 are configured.
As the water permeable member 41, for example, a known member such as an endren mat may be employed.
[0008]
<C> Outer pipe As shown in FIGS. 1 and 2, the outer pipe 7 is arranged in the vertical direction between the continuous underground wall 6 and the wall surface 2 of the excavation groove, and its entire length is the length of the water permeable member 41 from the ground part. It reaches the bottom. As shown in FIG. 3 and FIG. 4, in the axial direction of the position overlapping the water permeable member 41 on the peripheral surface of the outer tube 7, a slit 71 is formed toward the wall surface 2 of the excavation groove with the water permeable member 41 as the back. is there.
[0009]
<D> Injecting device The injecting device 8 includes an inner tube 81 accommodated in the outer tube 7 and a nozzle 82 provided on the peripheral surface of the tip portion.
The nozzle 82 projects in a direction orthogonal to the inner tube 81 with the water-permeable member 41 as a back, and is configured to be able to inject water or a solution such as a decomposing agent from the slit 71.
The inner pipe 81 is configured so as to be movable up and down in the outer pipe 7 by an elevating device 83 provided on the ground portion above the inner pipe 81.
As shown in FIG. 3, the lifting device 83 includes a drive motor 831 that serves as a lifting power source for the inner tube 81, a gear box 832, and a socket tube 834 having an inner tube lifting gear portion 833.
The inner pipe lifting / lowering gear part 833 moves the inner pipe 81 up and down by rotating the socket pipe 834 as a rack and pinion structure, for example, and destroys the mud film 10 attached over the entire length of the surface of the water permeable member 41. And can be removed.
It is conceivable that the outer tube 7 and the injection device 8 are arranged in a necessary number in the continuous underground wall 6 as appropriate.
It is also conceivable to install a plurality of nozzles 82 provided in the injection device 8.
[0010]
<E> Mud replacement tube As shown in FIGS. 1 and 2, the muddy water replacement tube 9 includes an inflow tube 91 and a discharge tube 92.
The inflow pipe body 91 is a pipe body that is disposed between the water permeable member 41 and the continuous underground wall 6 so that an opening is located near the upper portion of the water permeable member 41.
The discharge pipe 92 is a pipe arranged between the water permeable member 41 and the continuous underground wall 6 so that an opening is located near the bottom of the water permeable member 41.
A fluid such as fresh water is supplied from the inflow pipe body 91 to the water permeable member 41, and reverse water pressure is applied to the broken mud film 10 located near the surface of the water permeable member 41 to weaken the connection of the mud film 10.
Then, the mud film 10 broken together with the mud contained in the water permeable member 41 is sucked and discharged from the discharge pipe 92 to the ground.
Further, by supplying fresh water to the water permeable member 41 in place of the mud water sucked and drained by the discharge pipe body 92, high water collection and water covering property are secured to the water permeable member 41.
In addition, it is possible to arrange the necessary number of muddy water replacement tube bodies 9 according to the width of the water permeable member 41 to which the reverse water pressure is applied.
Further, the mud film 10 can be sufficiently removed only by the injection device 8 without providing the muddy water replacement tube 9.
[0011]
[Action]
The mud film destruction action by the continuous continuous underground wall structure will be described below with reference to the drawings.
[0012]
<B> Destruction of mud film by spraying device (Fig. 4)
The mud film 10 adhering to the surface of the water permeable member 41 of the water passage 4 is destroyed and removed by injecting a solution such as water or a decomposing agent from the nozzle 82 accommodated in the outer pipe 7.
At this time, by moving the inner pipe 82 up and down, the mud film 10 attached over the entire length of the surface of the water permeable member 41 can be destroyed and removed.
[0013]
<B> Removal of the broken mud film The mud film 10 on the surface of the water permeable member 41 destroyed by the above-described process is not between the continuous underground wall 6 and the water permeable member 41 so as not to adhere to the surface of the water permeable member 41 again. The muddy water replacement tubular body 9 is removed.
Specifically, by supplying high-pressure water into the inflow pipe body 91, reverse pressure is applied to the water permeable member 41 to weaken the coupling of the mud film 10, and the muddy water contained in the water permeable member 41 by the discharge pipe body 92. Then, the mud film 10 is sucked and discharged to the ground and removed from the vicinity of the surface of the water permeable member 41.
Further, by supplying fresh water to the water permeable member 41 in place of the mud water sucked and drained by the discharge pipe body 92, high water collection and water covering property are secured to the water permeable member 41.
[0014]
【The invention's effect】
Since the present invention is as described above, the following effects can be obtained.
<I> A continuous underground wall can be placed without blocking the existing groundwater flow.
Therefore, on the upstream side, various adverse effects on the environment such as rise of groundwater, spring water, generation of house moisture and mold, inundation into groundwater, and changes in vegetation are not caused.
On the downstream side, there is no negative impact on the environment, such as well drowning, water rot, ground subsidence due to groundwater level drop, and vegetation change.
<B> Since the injection device and the muddy water replacement pipe are embedded in the water permeable member, it is possible to actively perform maintenance against a decrease in water permeability due to clogging.
[Brief description of the drawings]
1 is a cross-sectional view of a continuous underground wall according to the present invention. FIG. 2 is a cross-sectional view between II and II in FIG. 1. FIG. 3 is an explanatory view of an injection device. Cross-sectional view of [Figure 5] Explanatory drawing at the time of mud film destruction by injection

Claims (5)

In the continuous underground wall that is configured by providing a water passage that communicates from one side surface to the other side surface to allow passage of the groundwater flow, and arranging a water permeable member between the opening of the water passage and the ground,
The present invention is characterized in that an injection device capable of removing the mud film adhering to the surface of the water-permeable member and the wall surface of the excavation groove by injecting water or a solution is provided.
Permeable continuous underground wall structure. 2. The water-permeable continuous underground wall structure according to claim 1, wherein the jetting device includes an outer pipe having a slit in an axial direction of a circumferential surface arranged from the ground portion to the water-permeable member, and the outer pipe accommodated in the outer pipe. A water-permeable continuous underground wall structure comprising an inner tube having a nozzle capable of jetting water or a solution from a slit of the tube. The water-permeable continuous underground wall structure according to claim 1 or 2, wherein the nozzle of the inner pipe and the slit of the outer pipe are positioned toward the outside of the continuous underground wall with the water-permeable member as a back. A water-permeable continuous underground wall structure. The water-permeable continuous underground wall structure according to any one of claims 1 to 3, wherein the inner pipe is installed so as to be movable up and down in the outer pipe. Construction. 5. The water-permeable continuous underground wall structure according to claim 1, wherein the water-permeable continuous underground wall structure includes a pipe body that reaches the water-permeable member from the ground and supplies the fluid to the water-permeable member and the water-permeable member. A water-permeable continuous underground wall structure, characterized by the arrangement of pipes that discharge muddy water to the ground.

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