JP3895240B2 - Underground continuous wall having a water passage, a water passage forming method for the underground continuous wall, and a water passage forming pipe member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground continuous wall having a water passage for passing groundwater, a method for forming an underground water passage for forming a water passage on the underground continuous wall, and a pipe member for forming an underground water passage.
[0002]
[Prior art]
When the underground continuous wall is constructed, the groundwater flow is blocked by the underground continuous wall, and the presence of the underground continuous wall greatly affects the behavior of the groundwater flow, such as an increase in the upstream groundwater level and a decrease in the downstream water level. Therefore, various attempts have been proposed to secure a water passage for groundwater in the underground continuous wall.
[0003]
For example, in Japanese Patent Application Laid-Open No. 07-76828, when constructing an underground continuous wall, a high-pressure pipe having a water jet nozzle portion is embedded in advance in a state in which the periphery is protected by a protective cylinder, and the underground continuous wall is constructed. After the completion, it is proposed to form a space (water passage) penetrating in a direction crossing the underground continuous wall by crushing a part of the underground continuous wall by jetting high-pressure water from the jet nozzle part. ing.
[0004]
However, with this method, it is difficult to control the shape of the space (water channel) penetrating in the direction crossing the underground continuous wall, and there is a risk of mere cracking.
[0005]
Therefore, in Japanese Patent Application Laid-Open No. 08-284154, a horizontal pipe material that can be extended outward by including a spring is attached to a hole provided in the flange portion of the H-shaped steel material in advance, and the flange portion By extending the stopper plate on the outer side, the extension of the pipe material by the spring material is limited.
[0006]
H-type steel with such a stopper plate and pipe material is set in the underground wall of soil cement, and then the pipe is removed by removing the stopper plate upward before the soil cement solidifies. It has been proposed to use a groundwater channel.
[0007]
Japanese Patent Laid-Open No. 10-317370 discloses that a horizontal pipe member whose both ends are sealed with a sealing material is attached in advance to a hole provided in the flange portion of the H-shaped steel material, and is placed outside by a pressure hose that continues on the ground. An extrusion device configured to project is built in the pipe material, and an inner pipe pushed outward by the extrusion is built in the pipe material. After constructing the underground continuous wall, hydraulic pressure is applied to the pressure pipe. It has been proposed that a horizontal pipe material sealing material is crushed by projecting a hanging pipe, and the pipe material is used as a water passage through which underground water passes.
[0008]
[Problems to be solved by the invention]
However, the technique disclosed in Japanese Patent Application Laid-Open No. 08-284154 requires the use of a special horizontal pipe with a built-in spring. In addition, it is necessary to pull out the stopper plate. Further, not only does the gap between the outer flanges of the H-shaped steel and the soil cement, which is an underground continuous wall steel member, but also the hardening of the soil cement, etc. It may be difficult to lift the stopper plate.
[0009]
The technique disclosed in Japanese Patent Laid-Open No. 10-317370 is a technique that requires a pressure pipe continuous on the ground and an extrusion device for extruding the inner tube by the pressure. Since it is embedded inside and cannot be recovered, it is very expensive.
[0010]
As described above, each of them requires a special device in the pipe and has a drawback that it is very expensive.
[0011]
An object of the present invention is to provide a water passage forming pipe member that can easily form a water passage through which groundwater can pass without requiring a special device in a horizontal pipe and without using a stopper plate. The present invention is to provide a method for forming a water passage for a middle continuous wall and a ground continuous wall.
[0012]
[Means for Solving the Problems]
The underground continuous wall water passage forming pipe member according to claim 1, wherein the pipe portion opened to the upper right, the pipe portion opened to the lower left, and the pipe portion opened to the upper left and the pipe portion opened to the lower right are mutually connected. A horizontal pipe portion that is formed so as to be in a straight line and that communicates with both pipe portions is provided between the pipe portion that opens to the lower left and the pipe portion that opens to the lower right. It is what.
[0013]
The underground continuous wall water passage forming pipe member according to claim 2, wherein the pipe part opened to the upper right, the pipe part opened to the lower left, and the pipe part opened to the upper left and the pipe part opened to the lower right are mutually connected. A horizontal pipe portion that is formed so as to be in a straight line and communicates with both pipe portions is provided between the pipe portion that opens to the lower left and the pipe portion that opens to the lower right, and opens to the lower left. Each of the pipe portion and the pipe portion opening to the lower right communicates with a hole provided in a flange portion of a steel member having an H-shaped section for reinforcing underground continuous wall, and each of the pipe portions is the steel member. It is fixed to at least one of the flange part or the web part.
[0014]
The underground continuous wall having the water passage according to claim 3, wherein a water passage forming pipe member is embedded in the underground continuous wall, and a pipe portion that opens to the upper right and a pipe portion that opens to the lower left of the water passage forming pipe member. And a pipe portion that opens to the upper left and a pipe portion that opens to the lower right are formed to communicate with each other in a straight line, and between the pipe portion that opens to the lower left and the pipe portion that opens to the lower right. A horizontal pipe portion communicating with both pipe portions is provided, and a water passage that passes through the underground continuous wall is formed from the pipe portion that opens to the lower left, the pipe portion that opens to the lower right, and the horizontal pipe portion. It is characterized by being made.
[0015]
The underground continuous wall water channel formation method according to claim 4, wherein the pipe portion opened to the upper right and the pipe portion opened to the lower left, and the pipe portion opened to the upper left and the pipe portion opened to the lower right are aligned with each other. And a water passage forming pipe in which a horizontal pipe portion communicating with both of the pipe portions is provided between the pipe portion opening to the lower left and the pipe portion opening to the lower right. After the member is sunk in the soil cement of the underground continuous wall with the pipe portion opening at the lower left and the pipe portion opening at the lower right closed with a sealing material, and the soil cement loses fluidity The excavator is inserted through the pipe portion that opens to the upper right and the pipe portion that opens to the upper left to remove the sealing material and the soil cement, so that the pipe portion that opens to the lower left and the right It is intended to and forming a water passage to the pipe section which opens to consist with the horizontal pipe portion.
[0016]
That is, in the underground continuous wall water passage forming pipe member of the present invention, the pipe portion opened to the upper right and the pipe portion opened to the lower left are formed to communicate with each other in a straight line, and open to the upper left. A pipe portion and a pipe portion that opens to the lower right are formed to communicate with each other in a straight line, and a horizontal pipe portion that communicates with each lower pipe portion that opens to the lower left and the lower right is provided.
[0017]
In order to increase the degree of fixation of the horizontal pipe part to the pipe part opening to the lower left and the pipe part opening to the lower right, the opening of the pipe part opening to the lower left and the pipe part opening to the lower right It is preferable that the horizontal pipe portion is provided at a position higher than the opening.
[0018]
However, it is sufficient that the lower end of the horizontal pipe portion is located at the opening of the pipe portion that opens to the lower left and the opening of the pipe portion that opens to the lower right, so that the horizontal pipe portion is provided at a higher position. By doing so, the horizontal pipe portion can be more reliably fixed to the pipe portion that opens to the lower left and the pipe portion that opens to the lower right.
[0019]
That is, in the underground continuous wall water passage forming pipe member of the present invention, the pipe portion opened to the upper right and the pipe portion opened to the lower left are formed to communicate with each other in a straight line, and open to the upper left. The pipe portion and the pipe portion that opens to the lower right are formed to communicate with each other in a straight line, and further, the pipe portion that opens to the lower left and the horizontal pipe portion that communicates to the pipe portion that opens to the lower right It is preferable that the opening is provided at a position higher than the opening of the pipe portion that opens to the lower left and the opening of the pipe portion that opens to the lower right.
[0020]
This pipe member is integrally formed with a steel member having an H-shaped cross section as described below, and when the underground continuous wall is constructed, the pipe member is submerged and the H-shaped member serves as a reinforcing member for the underground wall. It is preferable because the steel can be set in one step.
[0021]
That is, the pipe member of a more preferable form of the present invention is formed such that the pipe portion opening at the upper right and the pipe portion opening at the lower left are in communication with each other, and the pipe portion opening at the upper left and the lower right are formed. The open pipe part is formed to communicate with each other in a straight line, and the horizontal pipe part that communicates with each pipe part that opens to the lower left and right is a part above the opening of the lower right pipe part and the lower left part. The hole provided in the upper part of the pipe part and the hole provided in the flange part of the steel member is inclined to the pipe part that opens to the lower left and the pipe part that opens to the lower right. The pipe portion thus formed is fixed to at least one of the flange portion and the web portion of the steel member at any portion.
[0022]
In the above-described pipe member, it is preferable that the horizontal pipe portion communicating with the pipe portion opened to the left and right lower portions is closer to the lowermost portion as a water passage. In addition, it is preferable that a pipe portion that opens to the lower left and a pipe portion that opens to the lower right exist below the horizontal pipe portion because the water passage can be easily formed by the excavator as will be described later. Shape.
[0023]
In addition, the underground continuous wall having the water passage according to the present invention is configured such that the pipe portion that opens to the upper right and the pipe portion that opens to the lower left are aligned with each other, and the pipe portion that opens to the upper left and the lower right The horizontal pipe part communicating with each pipe part that opens in the left and right lower parts is formed in the right lower pipe part and the lower left pipe part. A water passage forming pipe member provided in a portion above the opening is embedded in the underground continuous wall, and each pipe portion and the horizontal pipe portion that open to the left and right lower portions are water passages. In addition, it is good for the pipe member mentioned above to be comprised integrally with the steel member of a cross-section H type.
[0024]
Further, in the method for forming a water passage in the underground continuous wall according to the present invention, the pipe portion that opens to the upper right and the pipe portion that opens to the lower left are configured to be in a straight line with each other. The pipe part that opens downward is formed so as to be in line with each other, and the horizontal pipe part that communicates with the pipe part that opens to the left and right lower parts is the opening of the lower right pipe part and the lower left pipe part. The water flow path forming pipe member provided above the opening of the pipe is set in the soil cement underground wall with the opening ends of the left and right lower pipe parts closed with a sealing material. After losing the fluidity, a drilling device capable of removing the sealing material and the soil cement is inserted from the ground, thereby forming a water passage composed of a pipe portion opened in the left and right lower portions and a horizontal pipe portion.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the underground continuous wall water passage forming pipe member 1 (hereinafter referred to as “pipe member 1”) of the present invention illustrated in FIGS. 1A and 1B, a pipe portion 1 a that opens to the upper right and a lower left portion opens. The pipe portion 1b, and the pipe portion 1c that opens to the upper left and the pipe portion 1d that opens to the lower right are formed so as to communicate with one pipe so as to form a straight line with each other.
[0026]
The horizontal pipe part 4 should just communicate with both the pipe part 1b opened to the lower left and the pipe part 1d opened to the lower right.
[0027]
However, in order to allow the horizontal pipe portion 4 to communicate with the pipe portions 1b and 1d and to be securely fixed to both the pipe portions 1b and 1d, the pipe portion 1b whose lower end of the horizontal pipe portion 4 opens to the lower left is described above. And at the position of the opening of the pipe portion 1d that opens to the lower right, and as shown in FIGS. 1 (a) and 1 (b), it exists at the lower part of both the pipe portions 1b and 1d. What is necessary is just to provide the horizontal pipe part 4 in the part above the opening parts 2b and 2d to perform.
[0028]
In particular, in the pipe member 1 illustrated in FIG. 1B, both the pipes that continue from the upper right to the lower left and the pipes that continue from the upper left to the lower right communicate with each other at the portion 3 that intersects with each other.
[0029]
Moreover, in the pipe member 1 of the underground continuous wall of the present invention illustrated in FIGS. 2A and 2C and the side view illustrated in FIG. 2B, the pipe portion 1a that opens to the upper right and the lower left opening. The pipe portion 1b, the pipe portion 1c that opens to the upper left, and the pipe portion 1d that opens to the lower right are formed to be in a straight line with each other, and a wide hollow portion 5 is formed at the intersecting portion. The pipe portions 1a and 1c and the pipe portions 1b and 1d communicate with each other.
[0030]
In addition, the lower part of the hollow part 5 is provided in the part above the pipe part 1b and the pipe part 1d. Of course, the hollow portion 5 may not be provided close to the pipe portions 1a and 1c as shown in FIG. 2A, but may be provided more than the pipe portions 1b and 1d as shown in FIG. Further, the shape of each pipe is generally preferably a cylindrical shape, but may be a rectangular tube shape or other shapes.
[0031]
An example of the state in which the pipe member 1 formed in this way is attached to the steel member 6 having an H-shaped section for reinforcing the underground continuous wall is shown in FIG. 3A shows a state viewed from the side, FIG. 3B shows a cross-sectional state of the bb portion in FIG. 3A, and FIG. 3C shows a cross-section in FIG. The cross-sectional state of part c is shown.
[0032]
First, as shown in FIG. 3A, the hole 8 provided in the flange portion 7a of the steel member 6 is inclined to each of the pipe portion 1b that opens to the lower left and the pipe portion 1d that opens to the lower right. It is provided together. Moreover, the opening 2c of the pipe part 1c opened to the upper left and the opening 2a of the pipe part 1a opened to the upper right are in contact with the flange part 7a of the steel member 6 having an H-shaped cross section. In this way, the pipe member 1 shown in FIG. 1A is fixed to at least one of the flange portion 7a and the web portion 7b of the steel member 6 at any portion.
[0033]
In this way, when the pipe member 1 is configured integrally with the steel member 6 having an H-shaped cross section, in the case shown in FIG. 1B or FIG. 2, the upper opening portion or the lower opening portion of the pipe member 1 may be used. It can arrange | position in the form along the web part 7b of the steel member 6 of a cross-section H type, As a result, the opening 8 provided in the steel member 6 of a cross-section H type can be made symmetrical.
[0034]
However, as shown in FIG. 1 (a), there is one pipe portion 1a that opens to the upper right, one pipe portion 1b that opens to the lower left, one pipe portion 1c that opens to the upper left, and one pipe portion 1d that opens to the lower right. The pipe part 1a that opens to the upper right and the pipe part 1c that opens to the upper left have an H-shaped cross section. When arranged in parallel with the web portion 7b of the steel member 6, the pipe portion 1b that opens to the lower left and the pipe portion 1d that opens to the lower right do not become parallel to the web portion 7b of the steel member 6 having an H-shaped cross section. Therefore, it is necessary to provide the hole 8 provided in the flange portion 7a of the steel member 6 having an H-shaped cross section at a position non-parallel to each other in accordance with the openings 2b and 2d of the lower pipe portion.
[0035]
Further, when the pipe member 1 as shown in FIG. 1B is used and the lower openings 2b and 2d are arranged so as to be parallel to the web portion 7b of the steel member 6 having an H-shaped section, the upper right The portion of the pipe portion 1a that opens to the top and the portion of the pipe portion 1c that opens to the upper left are arranged in parallel to each other with respect to the web portion 7b of the steel member 6 having an H-shaped section.
[0036]
Next, a method for embedding the above-described pipe member in the underground continuous wall will be described.
Even when using the pipe member 1 as illustrated in FIG. 1 without using the steel member having the H section in cross section, it is used in combination with the steel member 6 having the H section as illustrated in FIG. Also in this case, as shown in FIG. 4, the openings 2b and 2d of the lower pipe portions 1b and 1d are closed with a sealing material 9 such as clay, wax, paraffin or the like so that soil cement does not enter the pipe. In the state where the openings 2b and 2d of the pipe portions 1b and 1d are closed as described above, the soil cement continuous wall is set in an uncured soil cement 10 having fluidity, and as shown in FIG. 2d is installed so that it exists in the position of the permeable layer 11 with a groundwater vein in the ground. In addition, the code | symbol 12 is a water-impermeable ground.
[0037]
Next, at the stage where the soil cement 10 loses its fluidity, as shown in FIG. 5, the excavator 13 capable of removing the sealing material 9 and the soil cement has a pipe portion 1 a that opens to the upper right on the ground, and a pipe that opens to the upper left. By inserting each from the part 1c, the sealing material 9 and the soil cement existing outside thereof are destroyed, and the pipe parts 1b and 1d that open to the lower left and the lower right are connected to the horizontal pipe part 4 so that the water passages. And
[0038]
As the excavator, for example, an excavator 13 having a drill blade as illustrated in FIG. 5 may be used, or an excavator using an ultrahigh pressure water jet may be used.
[0039]
Thus, in a state where the pipe portions 1b, 1d and the horizontal pipe portion 4 that open to the left and right lower portions are used as water passages, preferably, as shown in FIG. 6, gravel, crushed stone, and the like through the upper pipe portions 1a, 1c. The drain material 14 is dropped and filled into the lower pipe portion and the lower space continuous therewith to suppress the outflow of the upstream sediment through the water passage to the downstream side.
[0040]
In this way, a groundwater flow channel is formed, but a water flow check device (not shown) such as a fiberscope is dropped into each pipe from the pipe portion 1a that opens to the upper right on the ground and the pipe portion 1c that opens to the upper left. Thus, the water flow condition can be monitored. Also, if the water flow rate is reduced due to clogging in the water passage, insert a rod with an injection port that can eject a high pressure jet at the tip from each surface through each pipe, and with water or air, depending on the case, water Since the clogging can be eliminated by jetting air at a high pressure, a desired water flow rate can always be maintained. In this way, the cleaning device can be inserted downward to clean the inside of the lower pipe portions 1b and 1d, clogging can be eliminated, and a desired water flow rate can always be maintained.
[0041]
As described above, as shown in FIG. 1, the pipe portion 1a that opens to the upper right and the pipe that opens to the lower left are shown in FIG. 1 in that various devices can be reliably inserted into the pipe portions 1b and 1d from above. The portion 1b is formed of a pipe so as to be in a straight line with each other, and the pipe portion 1c that is open on the upper left and the pipe portion 1d that is opened on the lower right is formed with a pipe so as to be in a straight line with each other. Is preferred.
[0042]
Moreover, as shown in FIG. 7, the pipe member 1 for the underground continuous wall having a structure in which the pipe portions 1b, 1d and the horizontal pipe portion 4 that open to the left and right lower portions can serve as water passages is appropriately installed in the underground continuous wall. Install at regular intervals.
[0043]
In FIG. 7, reference numeral 4 denotes a horizontal pipe portion. Moreover, if the installation interval of the pipe member 1 and the size of the cross-sectional area of a portion that can be a water passage between the pipe portions 1b, 1d and the horizontal pipe portion 4 opened at the left and right lower portions are determined according to the flow rate of the groundwater flow, etc. Good.
[0044]
Further, when there are a plurality of upper and lower permeable layers 11 in which groundwater veins exist in the ground, as illustrated in FIG. 8, the left and right lower portions are formed so that a water passage can be formed in accordance with the position of the permeable layer 11. What is necessary is just to determine the installation position of the pipe parts 1b and 1d which open to.
[0045]
FIG. 9 shows that the upper water passage in FIG. 8 is formed at the position of the upper water permeable layer 11 and the water passage from the lower part is arranged in the lower water permeable layer 11.
[0046]
That is, in FIG. 8A which is a diagram showing a planar state and FIG. 8B which is a diagram showing a side surface state, the pipe member 1 for the left underground continuous wall is the upper water passage 15 in FIG. The pipe member 1 for the underground continuous wall on the right side is for forming the lower water passage 15 in FIG.
[0047]
【The invention's effect】
In the underground continuous wall water passage forming pipe member of the present invention, the pipe part opened to the upper right and the pipe part opened to the lower left, and the pipe part opened to the upper left and the pipe part opened to the lower right are aligned with each other. A pipe portion that is formed so as to communicate with each other and that is above the opening of the pipe portion that opens to the lower left and a portion that is above the opening of the pipe portion that opens to the lower right and the pipe portion that opens to the lower left Since the horizontal pipe part communicating with the pipe part opened to the lower right is provided, it is set in the underground continuous wall such as soil cement with the opening ends of the left and right lower pipe parts closed with a sealing material, After the soil cement loses its fluidity, the right and left pipe parts and the horizontal pipe part are removed by inserting the excavator from the upper open end of each pipe and removing the sealing material and the outer soil cement part. The Ranaru water conduit can be easily formed.
[0048]
Moreover, since the used excavator can be recovered on the ground and reused as soon as it is used, it is very economical.
[0049]
As described above, the water passage forming pipe member of the present invention is inexpensive as an apparatus because it is not necessary to have a special member in the horizontal pipe portion as in the conventional example.
[0050]
Also, a water flow check device such as a fiberscope can be lowered from the ground in the pipe member, and the water flow state in the water passage formed by the left and right lower pipe portions and the horizontal pipe portion can be monitored. Moreover, even when clogging occurs in the flow channel, the cleaning device can be inserted downward and the water channel can be washed to eliminate the clogging, so that the desired water flow rate can always be maintained.
[0051]
Further, if necessary, drain materials such as gravel and crushed stone can be dropped from the ground into the pipe member and filled in the left and right lower pipe portions.
[0052]
In addition, since the pipe member is integrally formed with the steel member having an H-shaped cross section, the pipe member is sunk and the H-shaped steel material as a reinforcing material for the underground continuous wall is used in the construction of the underground continuous wall. Sinking can be performed in one step, and efficient construction can be achieved.
[0053]
In addition, the underground continuous wall having the water passage of the present invention is such that each of the left and right lower pipe portions and the horizontal pipe portion serve as a water passage, and each upper pipe portion having an opening on the ground exists. Observation and cleaning work to eliminate clogging can be carried out from the ground surface.
[0054]
The underground continuous wall water channel formation method of the present invention is such that the open ends of the left and right lower pipe portions are closed with a sealing material, and the soil cement is made to flow in the underground continuous wall of the soil cement. After losing, by inserting a drilling device capable of removing the sealing material and the soil cement from the ground, a water passage composed of the left and right pipe parts and the horizontal pipe part can be easily formed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing two examples of a water passage forming pipe member of the present invention.
FIG. 2 shows another example of a water passage forming pipe member of the present invention, in which (a) and (c) are partial front views, and (b) are side views.
FIG. 3A shows an example in which a water passage forming pipe member of the present invention is integrated with a steel member having an H-shaped cross section, and FIG. 3B is a schematic cross-sectional view taken along the line bb in FIG. c) is a schematic cross-sectional view taken along line cc in (a).
FIG. 4 is a view showing a state where a water passage forming pipe member of the present invention is embedded in soil cement.
FIG. 5 is a diagram showing a process of allowing water to flow from the state of FIG. 4;
FIG. 6 is a view showing a state in which a drain material is filled.
FIG. 7 shows an underground continuous wall in which a water passage forming pipe member is arranged, (a) is a transverse sectional view thereof, and (b) is a longitudinal sectional view thereof.
FIGS. 8A and 8B show a countermeasure example in the case where underground water channels exist vertically, where FIG. 8A is a transverse sectional view and FIG. 8B is a longitudinal sectional view thereof.
FIG. 9 is a diagram illustrating an example of how to handle a case where underground water channels exist vertically.
[Explanation of symbols]
1 Pipe member (pipe member that forms a water passage for the underground continuous wall)
1a Pipe part 1b opened to the upper right Pipe part 1c opened to the lower left Pipe part 1d opened to the upper left Pipe part 2a opened to the lower right 2a Pipe upper right opening 2b Pipe lower left opening 2c Pipe upper left opening 2d Pipe lower right opening 3 Pipe intersecting part 4 Horizontal pipe part 5 Wide hollow part 6 Steel member (section H-shaped steel member for reinforcing underground continuous wall)
7a Flange part 7b Web part 8 Flange opening 9 Sealing material 10 Soil cement 11 Water permeable layer (groundwater flow layer part)
12 Ground 13 Excavator 14 Drain material 15 Waterway

Claims (4)

The pipe portion that opens to the upper right, the pipe portion that opens to the lower left, and the pipe portion that opens to the upper left and the pipe portion that opens to the lower right are formed to communicate with each other in a straight line, and open to the lower left. An underground continuous wall water passage forming pipe member, characterized in that a horizontal pipe portion communicating with both pipe portions is provided between the pipe portion and the pipe portion opened to the lower right. A pipe part that opens to the upper right, a pipe part that opens to the lower left, and a pipe part that opens to the upper left and a pipe part that opens to the lower right are connected to each other in a straight line, and the pipe that opens to the lower left. A horizontal pipe portion that communicates with both pipe portions is provided between the pipe portion that opens to the lower right and the pipe portion that opens to the lower left and the pipe portion that opens to the lower right, respectively. It communicates with a hole provided in a flange portion of a steel member having an H-shaped cross section for wall reinforcement, and each pipe portion is fixed to at least one of a flange portion or a web portion of the steel member. A water passage forming pipe member of the underground continuous wall. A water passage forming pipe member is embedded in the underground continuous wall, and a pipe portion that opens to the upper right and a pipe portion that opens to the lower left of the water passage forming pipe member, and a pipe portion that opens to the upper left and a pipe that opens to the lower right. And a horizontal pipe portion communicating with both pipe portions is provided between the pipe portion opening at the lower left and the pipe portion opening at the lower right. And the underground which has a water passage characterized by forming the water passage which penetrates the underground continuous wall from the pipe part which opens to the lower left, the pipe part which opens to the lower right, and the horizontal pipe part Continuous wall. The pipe portion that opens to the upper right, the pipe portion that opens to the lower left, and the pipe portion that opens to the upper left and the pipe portion that opens to the lower right are formed to communicate with each other in a straight line, and open to the lower left. A water passage forming pipe member in which a horizontal pipe portion communicating with both pipe portions is provided between the pipe portion and the pipe portion opened to the lower right, and the pipe portion opened to the lower left and the pipe portion opened to the lower right is opened. The pipe part that opens to the upper right and the pipe part that opens to the upper left after the soil cement loses its fluidity after being sunk in the soil cement of the underground continuous wall with the pipe part to be sealed with a sealing material. Further, by inserting a drilling device and removing a part of the sealing material and the soil cement, the pipe part opened to the lower left, the pipe part opened to the lower right, and the horizontal pipe A water passage forming method of underground continuous wall and forming a water passage comprising a.

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