JP3650808B2 - A water hole forming apparatus and method for forming a water hole used for forming a water flow hole for maintaining a groundwater flow in a water shielding wall. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water flow conservation technique for a groundwater flow that is blocked by a water shielding wall for constructing an underground part of a civil engineering or building structure. The present invention relates to a water hole forming apparatus and a water hole forming method using the water hole forming apparatus.
[0002]
[Prior art]
When building a linear underground structure such as a subway or an underground road, if a deep wall is constructed continuously, free groundwater flow in the area may be blocked. FIG. 5 is a schematic diagram showing a state where the groundwater flow is blocked by the water blocking walls 100a and 100b. Here, the impermeable walls 100a and 100b are deeper than the flooring 107 in order to stabilize the excavation bottom ground, and are long penetrations 108 penetrating the permeable layers 105a and 105b to the impermeable layer 106b. For this reason, the groundwater flow 160a, 160b is blocked by the upstream impermeable wall 100b.
[0003]
When the groundwater flow 160a, b is blocked by the water-impervious walls 100a, b, the ground surface 150a on the downstream side causes ground subsidence due to a decrease in the groundwater level. Further, the fall of the groundwater level causes the standing tree 130a to wither and the well 120 to wither. Further, there is an influence such as settlement of the structure 110a such as a building.
[0004]
On the upstream side of the water-impervious wall 100b, the water level rises due to the blocking of the groundwater flow, and the wetness of the ground on the upstream surface 150b causes the root decay of the standing tree 130b, or the underground portion of the structure 110b. Water leakage may occur. In addition, since the circulation of groundwater flow is lost, the quality of the groundwater itself may deteriorate. Such influence on the surrounding environment appears during construction.
[0005]
Further, the impermeable walls 100a and 100b pass through the permeable layer 105b deeper than the flooring 107 so that the flooring 107 does not cause a floating phenomenon in which the underground structure floats due to the groundwater underneath. 106b is incorporated. For this reason, the underground water flow 160b deeper than the flooring 107 to be excavated for the construction of the structure is also blocked.
[0006]
In order to solve the above-mentioned problems, a method of restoring the groundwater flow at the top of the structure by removing the impermeable wall at the top of the structure after completion of the underground structure.
A method of drilling the wall surface of the cut-off part of the impermeable wall, inserting a water collecting pipe into the upstream permeable layer ground, and connecting it with the drain pipe inserted into the downstream permeable layer ground to restore the groundwater flow.
There is known a method of recovering a groundwater flow by digging a drainage well on both sides of the cut-off portion of the impermeable wall and connecting an upstream well and a downstream well in the ground.
However, in these groundwater flow maintenance methods, there is a problem that the groundwater flow 160a in the upper part of the flooring 107 that has been cut can be restored, but the groundwater flow 160b in a portion deeper than the flooring 107 cannot be restored.
[0007]
In addition, there is a problem that maintenance costs such as clogging of wells after construction are expensive.
[0008]
The inventor proposed in Japanese Patent Application No. 2000-205456 a mountain retaining wall having a groundwater flow maintenance function for forming a water passage at an arbitrary time and a construction method thereof for solving the above-mentioned problem. However, there is a problem that it is necessary to process the water passage hole portion in the steel pipe sheet pile in advance, which is expensive.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and is a water shielding material that blocks a groundwater flow for the purpose of preserving a groundwater flow that is blocked by a water shielding wall that is constructed in the construction of an underground excavation structure. It is an object of the present invention to provide a water hole forming apparatus and a water hole forming method for forming a water hole at an arbitrary time in a wall portion.
[0010]
In particular, a water-hole forming device that can easily and economically form a water-hole from the ground part of an arbitrary steel pipe sheet pile placed on a pile core of a water-impervious wall to an arbitrary depth inside the steel pipe. provide.
[0011]
Moreover, the water-hole formation apparatus which can be pulled up and reused after water-hole formation is provided.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the water-hole forming device used for groundwater flow maintenance water-hole formation of the water-impervious wall according to claim 1 is a groundwater flow blocked by a water-impervious wall constructed when constructing an underground excavation structure. For the maintenance of the water-permeable wall forming device for forming a water-permeable hole at an arbitrary time in the portion of the water-impervious wall blocking the groundwater flow,
The water flow hole forming device includes a suspension pipe suspended from the ground part of a steel pipe sheet pile placed on the pile core of the water-impervious wall inside the steel pipe, and a movable electric power provided at the tip of the suspension pipe. Consisting of a food device,
The movable erosion apparatus is housed inside the main body, a hollow main body fixed to the suspension tube, a movable electrode part fitted into a slidable piston at both end openings of the main body, and And an expansion / contraction mechanism for driving the movable electrode part back and forth,
The movable electrode portion includes an electrolyte solution pipe connection hole and an electric wire connection terminal, and includes a bottom plate fixed to the expansion / contraction arm of the expansion / contraction mechanism unit, and an electrode plate provided near the front opening through an insulating material. ,
The suspension pipe includes an electrolyte solution supply pipe for supplying an electrolyte solution to the movable electric corrosion apparatus, an electrode wire for applying a voltage, and an expansion / contraction mechanism drive source pipe for operating the expansion / contraction mechanism section. It is characterized by.
[0013]
A second aspect of the present invention is the first aspect of the present invention, wherein the telescopic mechanism is a hydraulic drive device or an electric drive device.
[0014]
Invention of Claim 3 is invention of Claim 1, Comprising: The said suspension pipe is provided with a connection part, is formed in arbitrary length by connection, and also it is the said movable electroerosion by rotating on a ground part. The apparatus is set to an arbitrary orientation.
[0015]
The invention according to claim 4 is the invention according to claim 1, wherein the steel pipe sheet pile has any one of a cylindrical shape, a prismatic shape, or a polygonal shape having a hollow inside.
[0016]
According to the invention of claim 5, in order to preserve the groundwater flow blocked by the impermeable wall constructed during the construction of the underground excavation structure, the portion of the impermeable wall where the groundwater flow is blocked is passed at any time. A water hole forming method using the water hole forming device according to claim 1 for forming water holes,
The movable electrolytic corrosion apparatus is suspended inside an arbitrary steel pipe sheet pile where a water passage hole is to be formed, and the expansion / contraction mechanism is driven to fix the movable electrode portion to contact the inner wall of the steel pipe sheet pile. By filling the movable electrode part with the electrolyte solution pipe through the electrolyte solution pipe at a time, and applying a voltage to the steel pipe sheet pile connected to the positive electrode of the DC power supply and the electrode plate connected to the negative electrode, the steel pipe sheet pile The water contact hole is formed by dissolving the portion where the movable electrode contacts with the anode.
[0017]
Invention of Claim 6 is invention of Claim 5, Comprising: When the said movable electrolytic corrosion apparatus hangs and inserts in a steel pipe sheet pile, a movable electrode is accommodated in the inside of a main body, and is inserted, A steel pipe sheet pile is inserted. It is characterized in that it is inserted into the basement deeper than the internal projection of the connecting portion, and when the water passage hole is formed, the movable electrode portion is extended to form a water passage hole.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of the present invention. The water flow hole forming device 10 of the present invention is composed of a suspension pipe 11 suspended from the ground portion 150 of the steel pipe sheet pile 40 inside the steel pipe, and a movable electrolytic corrosion apparatus 20 provided at the tip of the suspension pipe 11. Is done.
[0019]
The movable erosion apparatus 20 includes a hollow main body 21 fixed to the suspension tube 11 and a movable electrode part fitted in a slidable piston shape at both cylindrical openings of the main body 21. 22. Although the cylindrical main body 21 is shown in the embodiment, it may be a prism or polygonal column as long as the inside is hollow. Moreover, the movable electrode part 22 should just be the shape which can be inserted in accordance with the main-body part 21. FIG.
[0020]
The suspension pipe 11 includes an electrolyte solution supply pipe 12 for supplying the electrolyte solution 2 to the movable electrolytic corrosion apparatus 20, an electrode wire 13 for applying a voltage, and an expansion / contraction mechanism drive source pipe 14 for operating the expansion / contraction mechanism section 23. It is connected to an expansion mechanism drive source such as an electrolyte solution supply device 3, a DC power supply device 5, and a hydraulic control device 4 that are provided inside and disposed on the ground unit 150.
[0021]
In FIG. 1, the electrolyte solution circulation device 6 is provided on the ground portion 150, the electrolyte solution 2 inside the steel pipe sheet pile 40 is sucked up from the pipe 6 a, and the metal particles of the steel pipe sheet pile 40 dissolved by anodic dissolution are filtered and collected. The form which is recirculating | refluxing with the pipe 6b is shown.
[0022]
The steel pipe sheet pile 40 and the suspension pipe 11 are connected to each other by a core 41 and a connecting portion 11a and extended to a predetermined depth. When the movable electrolytic corrosion apparatus 20 is suspended and inserted into the steel pipe sheet pile 40, the movable electrode portion 22 is housed inside the main body portion 21 and is suspended and inserted, so that the core 41 of the connecting portion of the steel pipe sheet pile 40, etc. The movable erosion apparatus 20 can be inserted up to the deep water passage formation location 1a without being obstructed by the internal protrusions. When the water passage hole forming portion 1a is reached, the movable electrode portion 22 is extended from the main body portion 21 and brought into contact with the water passage hole forming portion 1a on the inner wall of the steel pipe sheet pile 40.
[0023]
Next, an embodiment will be described in detail with reference to a cross-sectional view showing the structure of the movable electrolytic corrosion apparatus 20 shown in FIG.
[0024]
In FIG. 2, the main body portion 21 includes a suspension tube connection portion 21 a connected to the suspension tube 11 (FIG. 1) at the upper portion, and from the interior of the suspension tube 11, the electrolyte solution pipe 12, the telescopic mechanism drive source pipe 14, The electric wire 13 is through-connected. In this embodiment, the telescopic mechanism 23 is a hydraulic jack. The expansion / contraction mechanism drive source pipe 4 is shown by two expansion / contraction hydraulic pipes. The telescopic mechanism 23 may be electrically operated. Further, the electrolyte solution pipe 12, the expansion / contraction mechanism drive source pipe 14, and the electric wire 13 may be connected not through the suspension pipe 11 but through the outside of the pipe.
[0025]
Inside the main body 21, there are a movable electrode part 22 fitted in a slidable piston shape in the openings on both ends of the cylindrical main body, and a telescopic mechanism part in which a telescopic arm 23 a is fixed to the bottom plate 22 c of the movable electrode part 22. 23.
[0026]
The movable electrode portion 22 includes a pipe connection hole 22a for connecting the electrolyte solution pipe 12 and a wire connection terminal 22b for connecting the electric wire 13 to the bottom plate 22c. The connected electrolyte solution pipe 12 and the electric wire 13 are connected to each other by a solution pipe 12a and a telescopic electric wire 13a having a space for the extension stroke of the movable electrode portion 22.
[0027]
Further, an electrode plate 2e is provided in the vicinity of the front opening of the movable electrode portion 22 via an insulating material 22d. The electrode plate 22e is connected to the wire connection terminal 22a by an electric wire, and can be applied with a voltage from the DC power source 5.
[0028]
By applying hydraulic pressure in the extending direction from the expansion / contraction mechanism drive source pipe 14 to the expansion / contraction mechanism section 23, the expansion / contraction arm 23a can be extended, and the movable electrode 22 can be pushed out to the outside indicated by an imaginary line.
[0029]
Next, a process of forming a water hole using the water hole forming apparatus of the present invention will be described with reference to a schematic diagram showing a construction state of the water hole forming apparatus in FIG. In FIG. 3, the steel pipe sheet piles 40 and 40 adjacent to each other are connected and driven by a connecting portion 40a.
[0030]
First, the water hole forming device 10 is suspended inside the steel pipe sheet pile 40 where the water hole 1 is to be formed, and when the movable electrolytic corrosion device 20 reaches the depth of the water hole forming portion, the direction in which the water hole 1 is to be formed. Make adjustments. In FIG. 3, although the example which provides a water flow hole so that the natural mountain part partitioned by the water-impervious wall 100 and an excavation part may be orthogonal was shown, it can also be set as a water flow hole toward the diagonal direction, and it can also be made plural .
[0031]
Next, the hydraulic control device 4 is driven to extend the telescopic arm 23 a by hydraulic driving via the telescopic drive source pipe 14 and open the movable electrode portion 22 until it contacts the inner wall of the steel pipe sheet pile 40.
[0032]
Subsequently, the electrolyte solution is supplied from the electrolyte solution supply device 3 through the electrolyte solution pipe 12, and at least the movable electrode portion 22 is filled to fill the electrolyte solution 2. As shown in FIG. 1, the electrolyte solution 2 may be supplied by a separately provided electrolyte solution circulation device 6 so that the movable electrolytic corrosion device 20 in the steel pipe is submerged in the electrolyte solution 2.
[0033]
Next, the anode of the DC power supply device 5 is applied to the steel pipe sheet pile 40, and the cathode voltage is applied to the electrode plate 22e of the movable electrode portion 22, and the steel pipe sheet pile 40 in the vicinity of the electrode plate 22e is dissolved in the anode to form the water passage hole 1. To do.
[0034]
After forming the water passage hole 1 by electrolytic corrosion, the hydraulic control device 4 is driven, the telescopic arm 23a is contracted by hydraulic drive via the telescopic drive source pipe 14, and is stored in the movable electrode portion 22 main body 21, and the steel pipe sheet pile. Remove from 40 and remove.
[0035]
As needed, the water-permeable hole material and the filter material for water purification are filled in the through-hole part which the steel pipe sheet pile penetrated.
[0036]
FIG. 4 is a schematic view showing a recovery state of the groundwater flow after construction of the water passage by the water passage forming device of the present invention.
[0037]
During construction, the underground structure 110c is built in a state where the water is blocked by the water-impervious walls 100, 100, and the upper part of the opened structure 110c is backfilled. As shown in the figure, the water passage hole 1 is penetrated through the impermeable wall 100 in contact with the water permeable layer 105a, and the groundwater flow 160a (FIG. 5) is restored by placing the water passage pipe 30 and backfilling.
[0038]
Further, the water passage hole 1 in contact with the water permeable layer 105b (FIG. 5) deeper than the flooring 107 (FIG. 5) restores the groundwater flow 160b. These water holes can be formed according to the progress of the construction and the time required to recover the groundwater flow.
[0039]
In the above embodiment, the steel pipe sheet pile 40 has been described as a cylindrical steel pipe. However, as long as the inside is hollow and the movable electrolytic corrosion apparatus 20 of the present invention can be suspended and inserted, it has a prismatic shape or a polygonal shape. Either may be sufficient.
[0040]
【The invention's effect】
According to the water flow hole forming apparatus used for groundwater flow maintenance water flow hole formation of the water blocking wall of the present invention, water can be easily and economically passed through the water blocking wall provided in the water permeable layer after the construction of the underground structure. Holes can be formed. In particular, since a water passage hole can be formed at an arbitrary depth and position of the impermeable wall, a water passage hole can be formed at a changed location even if the groundwater flow changes during construction.
[0041]
Further, since the water passage hole forming device can be used repeatedly, it is economical with respect to the conventional embedded type water hole forming device.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a water passage hole forming apparatus of the present invention.
FIG. 2 is a cross-sectional view showing the structure of the movable electrolytic corrosion apparatus of the present invention.
FIG. 3 is a schematic view showing a construction state of the water passage forming device of the present invention.
FIG. 4 is a schematic diagram showing a restoration state of a groundwater flow after construction of a water passage by the water passage forming device of the present invention.
FIG. 5 is a schematic diagram showing a state where a groundwater flow is blocked by a water blocking wall.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water flow hole 1a Water flow hole formation location 2 Electrolyte solution 3 Electrolyte solution supply apparatus 4 Hydraulic control apparatus (extension mechanism drive source)
DESCRIPTION OF SYMBOLS 5 DC power supply 6 Electrolyte solution circulation apparatus 6a, 6b Pipe 10 Water flow hole formation apparatus 11 Suspension pipe 11a Connection part 12 Electrolyte solution supply pipe 12a Solution pipe 13 Electrode electric wire 13a Telescopic electric wire 14 Telescopic mechanism drive source pipe 20 Movable electric corrosion apparatus 21 Main body part 21a Suspension pipe connection part 22 Movable electrode part 22a Pipe connection hole 22b Electric wire connection terminal 22c Bottom plate 22d Insulation material 22e Electrode plate 23 Telescopic drive part 23a Telescopic arm 30 Water pipe 40 Steel pipe sheet pile 40a Connection part 41 Core 100 , 100a, 100b Impervious walls 105, 105a, 105b Permeable layers 106, 106a, 106b Impervious layers 160a, 160b Groundwater flow 107 Flooring 108 Necking 110, 110a, 110b Structures 130, 130a, 130b Standing trees 150, 150a, 150b Ground surface, above-ground part

Claims (6)

In order to maintain the groundwater flow blocked by the impermeable wall constructed during the construction of the underground excavation structure, a water passage hole is formed at any time in the portion of the impermeable wall where the groundwater flow is blocked. A water passage forming device,
The water flow hole forming device includes a suspension pipe suspended from the ground part of a steel pipe sheet pile placed on the pile core of the water-impervious wall inside the steel pipe, and a movable electric power provided at the tip of the suspension pipe. Consisting of a food device,
The movable erosion apparatus is housed inside the main body, a hollow main body fixed to the suspension tube, a movable electrode part fitted into a slidable piston at both end openings of the main body, and And an expansion / contraction mechanism for driving the movable electrode part back and forth,
The movable electrode portion includes an electrolyte solution pipe connection hole and an electric wire connection terminal, and includes a bottom plate fixed to the expansion / contraction arm of the expansion / contraction mechanism unit, and an electrode plate provided near the front opening through an insulating material. ,
The suspension pipe includes an electrolyte solution supply pipe for supplying an electrolyte solution to the movable electric corrosion apparatus, an electrode wire for applying a voltage, and an expansion / contraction mechanism drive source pipe for operating the expansion / contraction mechanism section. A water hole forming device used for forming a water flow hole for maintaining a groundwater flow in a water shielding wall. The water flow hole forming device used for forming a water flow hole for maintaining a groundwater flow in a water shielding wall according to claim 1, wherein the expansion and contraction mechanism is a hydraulic drive device or an electric drive device. The said suspension pipe is provided with a connection part, is formed in arbitrary length by connection, and also sets the said movable electrolytic corrosion apparatus in arbitrary directions by rotating on a ground part. A water hole forming apparatus used for ground water flow maintenance water hole formation of the described impermeable wall. The said steel pipe sheet pile is a cylindrical shape with a hollow inside, prismatic shape, or polygonal shape, The through-hole formation used for the underground water flow maintenance through-hole formation of the impermeable wall of Claim 1 characterized by the above-mentioned. apparatus. In order to maintain the groundwater flow blocked by the impermeable wall constructed during the construction of the underground excavation structure, a water passage hole is formed at any time in the portion of the impermeable wall where the groundwater flow is blocked. A water hole forming method using the water hole forming apparatus according to claim 1,
The movable electrolytic corrosion apparatus is suspended inside an arbitrary steel pipe sheet pile where a water passage hole is to be formed, and the expansion / contraction mechanism is driven to fix the movable electrode portion to contact the inner wall of the steel pipe sheet pile. By filling the movable electrode part with the electrolyte solution pipe through the electrolyte solution pipe at a time, and applying a voltage to the steel pipe sheet pile connected to the positive electrode of the DC power supply and the electrode plate connected to the negative electrode, the steel pipe sheet pile A method for forming a water passage hole, comprising forming a water passage hole by dissolving the portion where the movable electrode contacts with the anode. When the movable electrolytic corrosion device is suspended and inserted in the steel pipe sheet pile, it is inserted into the basement deeper than the internal projection of the connecting part of the steel pipe sheet pile by inserting and inserting the movable electrode inside the main body, and at the water hole formation place 6. The method of forming a water passage hole according to claim 5, wherein the water passage hole is formed by extending the movable electrode portion when reaching.

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