JP3852879B2 - Underground wall construction method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for making a continuous wall body in the ground, for example, a method and an apparatus for constructing a continuous wall for enclosing a harmful substance around a soil containing a harmful substance.
[0002]
[Prior art]
For example, various techniques have been proposed in order to prevent the metal cleaning liquid and other harmful substances remaining in the ground such as the factory ruins from exuding. For example, (1) collecting and backfilling the harmful substances, (2) solidifying the whole, (3) detoxifying with chemicals, etc. are known. However, since these techniques are troublesome and costly for a relatively wide range, a technique for enclosing and enclosing the surroundings to prevent toxic substances from leaching has been developed.
[0003]
As an example, a side wall T and a bottom wall S surrounding a harmful substance Z remaining in the ground G are provided as shown in FIG. 5 so that the harmful substance Z does not exude to the outside of the side wall T and the bottom wall S. It was.
[0004]
However, in the example of FIG. 5, it is relatively easy to construct the side wall T, but it is difficult to construct the bottom wall S, and particularly when the bottom wall S is wide, the chemical solution does not reach.
[0005]
In view of this, the present applicant, in Japanese Patent Application No. 9-16325, as shown in FIG. 6, sandwiches the residual hazardous substance Z, and from the positions A and B on the left and right sides in the drawing, the residual hazardous substance Z In order to avoid contact with the harmful substance Z in the diagonal direction, the drill holes E are drilled to the position C where the tips intersect each other or beyond, and the drilling work (boring work) is performed. Construction is carried out at a predetermined interval in the direction perpendicular to the paper surface, and a grout material injection pipe having a nozzle at the tip is inserted into the excavation hole (boring hole) E, and the grout material is sprayed between adjacent excavation holes E and pulled up. A technique for forming F was proposed.
[0006]
Although this proposal itself is effective, if the direction of the nozzle of the pipe P inserted into the excavation hole E is not appropriate, the jet stream J is adjacent as shown in FIG. It will shift | deviate between the excavation holes E and E, and a discontinuous part will be made between adjacent excavation holes E and E. FIG. As a result, the continuous wall is not constructed, and the harmful substance Z diffuses into the soil from the discontinuous portion, which is inconvenient.
[0007]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above-described problems of the prior art, and its main object is to provide a method and apparatus for constructing a subterranean wall that can reliably form a continuous wall in the ground. .
[0008]
Another object of the present invention is to detect the jet direction of a jet stream from a nozzle in order to achieve the above object.
[0009]
It is yet another object of the present invention to provide a method and apparatus that allows jet streams from nozzles of adjacent grout injection pipes to reliably intersect and thereby build a continuous wall.
[0010]
[Means for Solving the Problems]
According to the present invention, a plurality of excavation holes 1 are excavated, grout material injection pipes 2 are inserted into the excavation holes 1, and a right angle direction of the grout material injection pipe 2 from a nozzle N provided in the grout material injection pipe 2. In the method of constructing the underground wall in which the grout material injection pipe 2 is pulled up and the wall body is constructed while injecting the grout material, the nozzle N is inclined with respect to the plane including the center line of the adjacent excavation hole 1 The angle of inclination θ is detected by a sensor 4 provided in the grout injection pipe 2, and the jet flow J injected from the grout injection pipe 2 in the adjacent excavation hole 1 is detected by the sensor 4 signal. The inclination angle θ is adjusted so that it always intersects.
[0011]
Furthermore, according to the present invention, the excavation hole 2 is inclined with respect to the vertical line and surrounds the soil containing harmful substances.
[0012]
According to the present invention, a plurality of excavation holes 1 are excavated, grout material injection pipes 2 are inserted into the excavation holes 1, and the grout material injection pipe 2 is connected to the grout material injection pipe 2 through a nozzle N. In the underground wall construction apparatus for constructing a wall body by pulling up the grout material injection pipe 2 while injecting the grout material in a right angle direction, the nozzle N is located on the surface including the center line of the adjacent excavation hole 1. The grout injection pipe 2 is installed at an inclination angle θ, and the grout injection pipe 2 is inserted into an excavation hole 1 inclined with respect to the vertical line. A nozzle N for detecting the inclination angle θ is provided below the grout injection pipe 2. Direction sensor 5, an inclination sensor 4 for detecting an inclination with respect to the vertical line, a battery 3 for supplying electric power to the sensors 4, 5, and signals from the sensors 4, 5 And a receiver 7 for receiving a signal from the transmitter 6 on the ground.
[0013]
Further, according to the present invention, a plurality of excavation holes 1 are excavated, grout material injection pipes 2 are inserted into the excavation holes 1, and a right angle of the grout material injection pipe 2 from a nozzle N provided in the grout material injection pipe 2. In the underground wall construction apparatus that constructs a wall body by pulling up the grout material injection pipe 2 while injecting the grout material in the direction, the grout material injection pipe 2 for injecting the grout material includes an inner tube 2B and an outer tube 2A. A nozzle N for injecting a grout material is provided in the outer tube 2A, and the nozzle N is installed at an inclination angle θ with respect to a plane including the center line of the adjacent excavation hole 1, and the grout material The injection pipe 2 is inserted into the excavation hole 1 inclined with respect to the vertical line, and a direction sensor 5 of the nozzle N for detecting the inclination angle θ and an inclination with respect to the vertical line are provided below the grout injection pipe 2. An inclination sensor 4 for detection is provided, and a signal line 9 from each of the sensors 4 and 5 is wired to the inner tube 2B. The signal line 9 is connected to the ground computer C via the cable 10 from the top of the inner tube 2B. It is connected to the.
[0014]
In addition, according to the present invention, the female portion 2C and the male portion 2D for connecting the inner tube 2B are provided, and the engaging portions 19 and 20 of the female portion 2C and the male portion 2D are engaged with each other. Connection pieces 14 and 16 to be connected are provided.
[0015]
Therefore, according to the present invention, the direction of injection from the nozzle, that is, the angle around the center of the pipe and the inclination of the center line can be known. When the inclination of the center line is inappropriate, the inclination of the nozzle may be moved in the correct direction, and the direction can be corrected by rotating the pipe. In this way, by properly directing the injection direction of the grout material from the nozzle, the injection from the adjacent pipes always intersects, so that a reliable underground continuous wall can be constructed.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is, for example, an arrow view in the X direction of FIG. 6 as in FIG. 7, in which a plurality of excavation holes 1 are inclined and a grout injection pipe 2 is inserted into the excavation holes 1. Then, the wall body is constructed by pulling up the grout material in a known manner.
[0017]
The jet stream J is injected at an angle θ with respect to a plane Q (in this example, an inclined plane) including the center line of the adjacent excavation hole 1. Therefore, since adjacent jet streams J always intersect, a continuous wall can be constructed.
[0018]
However, it has not been known in the past whether or not the nozzle is correctly oriented at this angle θ for work in the ground, but in the present invention, it can be known as follows.
[0019]
FIG. 2 shows a place where a grout injection pipe 2 embodying the present invention is inserted into a borehole. The grout injection pipe 2 is rotatably supported by a device (not shown) via a swivel S in a known manner. The pipe 2 is provided with a pair of nozzles N provided as shown in FIG. A battery 3, a nozzle N tilt sensor 4, a nozzle N direction sensor 5, and a transmitter 6 are provided below the pipe 2. A receiver 7 is provided on the ground G. The transmitter 6 transmits signals from the direction sensor 5 and the tilt sensor 4 to the receiver 7, and the battery 3 is the power source.
[0020]
Therefore, when the signal from the tilt sensor 4 is not appropriate, it is understood that the excavation hole E is not appropriate, and the direction of the nozzle N may be changed. If the direction sensor 5 is not appropriate, the pipe 2 may be rotated around its center line to make it appropriate.
[0021]
Thus, since the direction of the jet stream J becomes appropriate, between the adjacent excavation holes E, the grout material is always injected in an intersecting state, and a continuous wall is constructed. Therefore, harmful substances can be completely contained.
[0022]
In the implementation of the present invention, the tilt sensor 4 and the direction sensor 5 may be any appropriate known one, but an electromagnetic type, a magnetic type or a gyro type is preferable.
[0023]
3 and 4 show an embodiment using a wired system. In the figure, the grout material injection pipe 2 includes an outer tube 2A rotatably supported by a swivel S1 and an inner tube 2B rotatably supported by a swivel S2, and a jet flow J of the grout material is generated in the outer tube 2A. A nozzle N is provided. In addition, an inclination sensor 4 for the nozzle N and a direction sensor 5 for the nozzle N are provided below the outer tube 2A, and signal lines from the sensors 4 and 5 are connected to the cable 9 via the connector 8. . The cable 9 is connected to the power supply and signal cable 10 by the inner tube 2B as described later, and is displayed on the computer C.
[0024]
When the depth of the excavation hole E is deep, the outer tube 2B can be connected in a known manner. However, the inner pipe 2B needs to connect a signal line. An example is shown in FIG. When the inner pipe 2B is continued vertically, the female part 2C of one inner pipe 2B is fitted to the male part 2D of the other inner pipe 2B. The signal line 12 provided inside the small diameter part 11 of the female part 2C is connected to a first connection piece 14 provided inside the large diameter part 13 of the female part 2C.
[0025]
The second connection piece 16 provided outside the fitting portion 15 of the male portion 2D is connected to the signal line 18 of the male portion 2D. The signal line 18 extends from the outside of the fitting portion 15 to the inside of the large-diameter portion 17. Is arranged. Then, first and second engaging portions 19 and 20 that are engaged with each other by the large-diameter portion 13 of the female portion 2C and the large-diameter portion 17 of the male portion 2D are provided, respectively.
[0026]
Therefore, if the small-diameter portion 15 of the male portion 2D is inserted into the large-diameter portion 13 of the female portion 2C and the first and second engaging portions 19 and 20 are engaged with each other, the first connecting piece 14 And the second connection piece 16 are connected to each other. In this way, the cable 10 can be connected to the cable 9. In this example, the use effect is the same as that of the embodiment of FIG.
[0027]
It is clear that the present invention can be applied not only to contain harmful substances but also to normal vertical continuous walls.
[0028]
【The invention's effect】
As described above, according to the present invention, the nozzle injection direction can be correctly recognized, and the nozzle injection direction can be correctly adjusted based on the result. This ensures that jet flows from adjacent pipes intersect each other, and as a result, a reliable continuous wall can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an underground wall constructed according to the present invention.
FIG. 2 is a side view showing an apparatus for carrying out the present invention.
FIG. 3 is a side view showing another apparatus for carrying out the present invention.
4 is an explanatory view showing a connection portion of the inner pipe in the example of FIG. 3;
FIG. 5 is an explanatory diagram showing a conventional technique.
FIG. 6 is an explanatory diagram of another conventional technique having a part common to the embodiment of the present invention.
FIG. 7 is a diagram for explaining inconveniences caused by the prior art.
[Explanation of symbols]
2 ... Pipe for grout injection 2A ... Outer tube 2B ... Inner tube 2C ... Female portion 2D ... Male portion 3 ... Battery 4 ... Tilt sensor 5 ... Direction sensor 6 ... Transmitter 7 ... Receiver 8 ... Connector 9, 10 ... Cable C ... Computer

Claims (5)

  A plurality of excavation holes (1) are excavated, and a grout material injection pipe (2) is inserted into the excavation holes (1), and a grout material injection pipe is provided from a nozzle (N) provided in the grout material injection pipe (2). In the construction method of the underground wall in which the grout material injection pipe (2) is pulled up and the wall body is constructed while injecting the grout material in the right-angle direction of (2), the nozzle (N) has an adjacent excavation hole (1 ) With respect to a plane including the center line of the), and the inclination angle (θ) is detected by a sensor (4) provided in the grout injection pipe (2), and the sensor (4 ), The inclination angle (θ) is adjusted so that the jet flow (J) injected from the grout injection pipe (2) in the adjacent excavation hole (1) always intersects. Construction method.   The method for constructing an underground wall according to claim 1, wherein the excavation hole (2) is inclined with respect to a vertical line and surrounds soil containing harmful substances.   A plurality of excavation holes (1) are excavated, and a grout material injection pipe (2) is inserted into the excavation holes (1), and a grout material injection pipe is provided from a nozzle (N) provided in the grout material injection pipe (2). In the underground wall construction device for constructing a wall body by pulling up the grout material injection pipe (2) while injecting the grout material in a right angle direction of (2), the nozzle (N) is adjacent to an excavation hole (1 ) With a tilt angle (θ) with respect to the plane including the center line, and the grout injection pipe (2) is inserted into the excavation hole (1) inclined with respect to the vertical line. Below the injection pipe (2), there are provided a direction sensor (5) of the nozzle (N) for detecting the inclination angle (θ) and an inclination sensor (4) for detecting the inclination with respect to the vertical line. Supply power to each sensor (4, 5) A battery (3) and a transmitter (6) for transmitting a signal from each of the sensors (4, 5), and a receiver for receiving a signal from the transmitter (6) on the ground ( 7) An underground wall construction apparatus characterized by being provided.   A plurality of excavation holes (1) are excavated, and a grout material injection pipe (2) is inserted into the excavation holes (1), and a grout material injection pipe is provided from a nozzle (N) provided in the grout material injection pipe (2). In the underground wall construction apparatus for constructing a wall body by pulling up the grout material injection pipe (2) while injecting the grout material in the right angle direction of (2), the grout material injection pipe (2 ) Comprises an inner pipe (2B) and an outer pipe (2A), and a nozzle (N) for injecting grout material is provided in the outer pipe (2A), and the nozzle (N) The grout injection pipe (2) is installed at an inclination angle (θ) with respect to the plane including the center line, and the grout injection pipe (2) is inserted into the excavation hole (1) inclined with respect to the vertical line. The inclination angle (θ) is detected at the bottom of (2). A nozzle (N) direction sensor (5) to be known and an inclination sensor (4) for detecting an inclination with respect to the vertical line are provided, and a signal from each sensor (4, 5) is provided in the inner pipe (2B). Wire (9) is wired, and its signal line (9) is connected to the ground computer (C) from the top of the inner pipe (2B) via the cable (10). Construction device.   A female portion (2C) and a male portion (2D) for connecting the inner pipe (2B) are provided, and the engaging portions (19, 20) of the female portion (2C) and the male portion (2D) are engaged. The underground wall construction apparatus according to claim 4, wherein connection pieces (14, 16) connected to each other are provided at the positions.

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