Underground obstacle removal method

Abstract

To provide an underground obstacle removal method and a sheath pipe device which prevent a new obstacle G from occurring when an obstacle is removed, and can reduce noise by obstacle removal work.SOLUTION: A vertical hole is formed above an underground obstacle G. A hole wall protective pipe 11 is inserted into the vertical hole. A sheath pipe 12 is inserted into the hole wall protective pipe and is installed therein. In an obstacle crushing step, a rod 14 having a rock drilling part 13 on its lower end is inserted into a sheath pipe, the rod is reciprocated inside the sheath pipe in a center axis direction to crush an obstacle by the rock drilling part. After the obstacle crushing step, in a rod pull-out step, the rod is pulled out from the sheath pipe. After the rod pull-out step, in a sheath pipe moving step, the sheath pipe is installed at a position deviated in a horizontal direction. After the sheath pipe removal step, in a crushing repeating step, the obstacle crushing step, the rod pull-out step and the sheath pipe moving step are repeated. After the crushing repeating step, the rod is pulled out from the sheath pipe, and the sheath pipe is pulled out from the hole wall protective pipe.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an underground obstacle removal method for removing underground obstacles, and a sheath pipe device used in the underground obstacle removal method. [Background technology]

[0002] The down-the-hole hammer method is generally used to remove obstacles such as concrete and rocks buried underground. However, the down-the-hole hammer method is applied to cases where construction is performed on relatively stable ground without protecting the hole wall. As a method for removing obstacles while protecting the hole wall, an obstacle removal excavation method using an obstacle removal excavation device that includes first and second rotary drive devices that are arranged to be vertically movable along a leader and are driven independently, a cylindrical first casing that is connected to the first rotary drive device and has cutting teeth at its lower end, and a cylindrical second casing that is connected to the second rotary drive device, is fitted into the first casing, and has cutting teeth at its lower end is disclosed (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 2974663 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the obstacle removal drilling method described in Patent Document 1 has a problem that when removing obstacles or when pulling out the first outer casing and the second inner casing, the boulders and boulders around the hole wall may collapse and create new obstacles in the hole. Also, there is a problem that noise is generated by the obstacle removal work using the first casing and the second casing.

[0005] The present invention has been made with attention to such problems, and aims to provide an underground obstacle removal method and sheath pipe device that are less likely to create new obstacles when removing obstacles and that can reduce noise caused by the obstacle removal work. [Means for solving the problem]

[0006] In order to achieve the above object, the method for removing an underground obstacle according to the present invention is a method for removing an underground obstacle, the method comprising: a vertical hole forming step of forming a vertical hole above an underground obstacle; a hole wall protection step of inserting a hole wall protection tube into the vertical hole close to above the obstacle after the vertical hole forming step; a sheath tube installation step of inserting a sheath tube into the hole wall protection tube with its central axis parallel to that of the hole wall protection tube and installing the lower end of the sheath tube close to above the obstacle after the hole wall protection step; and a sheath tube installation step of inserting a rod having a rock drilling portion at its lower end into the sheath tube and reciprocating the rod in the direction of the central axis inside the sheath tube to remove the obstacle with the rock drilling portion after the sheath tube installation step. the obstacle crushing step of crushing the obstacle; a rod withdrawal step of withdrawing the rod from the sheath tube after the obstacle crushing step; a sheath tube moving step of installing the sheath tube at a position horizontally shifted from a previous installed position in the hole wall protection tube with the central axis of the hole wall protection tube and the central axis of the sheath tube parallel to each other and with the lower end of the sheath tube close to above the obstacle after the sheath tube moving step; a crushing repetition step of repeating the obstacle crushing step, the rod withdrawal step, and the sheath tube moving step after the crushing repetition step; and a sheath tube withdrawal step of withdrawing the rod from the sheath tube and withdrawing the sheath tube from the hole wall protection tube after the crushing repetition step.

[0007] In the underground obstacle removal method according to the present invention, in the obstacle crushing step, the rod is reciprocated inside the sheath tube inserted into the hole wall protection tube, and the rock drilling part at the lower end of the rod crushes the obstacle below the sheath tube. In the rod withdrawal step, the rod is withdrawn from the sheath tube, and in the sheath tube movement step, the sheath tube is placed in a horizontally shifted position. In the crushing repetition step, the obstacle crushing step, the rod withdrawal step, and the sheath tube movement step are repeated. In this way, the obstacle below the hole wall protection tube is crushed. Since the obstacle is crushed below the sheath tube, and the sheath tube is placed inside the hole wall protection tube, the rock blocks, boulders, and boulders around the hole wall are unlikely to collapse when the sheath tube is moved during obstacle removal, and new obstacles are unlikely to be generated in the hole. In addition, the sheath tube and the hole wall protection tube can block and reduce noise caused by the obstacle removal work. In the present invention, the obstacle is, for example, concrete, rock, hard bedrock, or the like. In the present invention, the previously installed position within the hole wall protection tube is the position installed in the sheath tube installation process, and in the repeated crushing process, is further the position installed in the sheath tube movement process.

[0008] The hole wall protection tube is preferably installed along the hole wall of the vertical hole. In the sheath tube moving step, the sheath tube is preferably installed so that it contacts the inner circumference of the hole wall protection tube within 10 cm, and the sheath tube is preferably installed so that the trajectory of the sheath tube goes around the inner circumference of the hole wall protection tube while overlapping with the adjacent trajectories, and the inside surrounded by the trajectory of the sheath tube that has gone around once is filled with the trajectory of the sheath tube.

[0009] In the underground obstacle removal method according to the present invention, a sheath tube device is provided with a base that is installed at the opening of the hole wall protection tube, and a plurality of sheath tubes are installed at the base and extend parallel to each other, and in the sheath tube installation step, the base of the sheath tube device is installed at the opening of the hole wall protection tube, and a plurality of the sheath tubes are inserted into the hole wall protection tube with the central axis of the hole wall protection tube and the central axis of the sheath tube parallel to each other, and the lower end of the sheath tube is installed close to the top of the obstacle, and after the rod extraction step, the rod is removed from the sheath tube other than the sheath tube into which the rod was previously inserted. The method includes an obstacle crushing process in which the rod is inserted inside the other sheath tube and reciprocated inside the other sheath tube in the direction of the central axis to crush the obstacle with the rock drilling section, and a rod extraction process in which the rod is extracted from the other sheath tube after the obstacle crushing process.It is preferable that in the sheath tube moving process, after the rod extraction process, the base is rotated along the opening and set in place, and in the crushing repetition process, the obstacle crushing process, the rod extraction process, the obstacle crushing process, the rod extraction process, and the sheath tube moving process are repeated.

[0010] In this case, by using the sheath tube device, multiple sheath tubes can be easily installed in the sheath tube installation step, and the sheath tubes can be easily installed at horizontally shifted positions in the sheath tube movement step. Since multiple sheath tubes can be installed simultaneously, the number of sheath tube movement steps can be reduced, and work efficiency can be improved.

[0011] The number of sheath tubes may be two or three or more. In the case of two, it is preferable that the sheath tubes are provided on the base so that they are symmetrically positioned on either side of the central axis of the sheath tube when the base is installed at the opening of the hole wall protection tube. In the case of three or more, it is preferable that the sheath tubes are provided on the base so that they are evenly arranged around the central axis of the sheath tube when the base is installed at the opening of the hole wall protection tube. In the present invention, in the obstacle crushing step and the other obstacle crushing step, it is preferable that the rod is caused to perform a rotational movement in addition to a reciprocating movement. In the present invention, in the obstacle crushing other process, the other sheath tube of the sheath tube into which the rod was previously inserted means the other sheath tube of the sheath tube into which the rod was inserted in the obstacle crushing other process, and in the repeated crushing process when there are three or more sheath tubes, it means the other sheath tube of the sheath tube into which the rod was inserted in the previous obstacle crushing other process.

[0012] The sheath tube device of the present invention is characterized in having a base that is rotatably installed along the opening of a hole wall protection tube inserted into a vertical hole formed above the obstacle in the ground, and a plurality of sheath tubes that are provided on the base and inserted into the hole wall protection tube when the base is installed in the opening, and extend parallel to each other in the longitudinal direction of the hole wall protection tube. The sheath pipe device of the present invention can facilitate the installation of multiple sheath pipes in the underground obstacle removal method, and can facilitate the installation of the sheath pipes in horizontally offset positions. It can also reduce the number of sheath pipe movements, improving work efficiency. Effect of the Invention

[0013] According to the present invention, it is possible to provide a method for removing underground obstacles and a sheath pipe device which are less likely to create new obstacles when removing obstacles and which can reduce noise caused by the obstacle removal work. [Brief description of the drawings]

[0014] [Figure 1] 1 is an explanatory diagram showing steps of an underground obstacle removal method according to an embodiment of the present invention; [Diagram 2] 2 is an explanatory diagram showing a step subsequent to the step of the underground obstacle removal method of FIG. 1. [Diagram 3] FIG. 2 is a machine layout diagram of step (D) in FIG. [Figure 4] 1A is an explanatory plan view of a processing location using an underground obstacle removal method according to an embodiment of the present invention, and FIG. 1B is an excavation layout diagram showing the processing sequence of an obstacle crushing process. [Diagram 5] FIG. 1 is an explanatory diagram showing a method for removing underground obstacles and a method for driving steel sheet piles using a vibro hammer method according to an embodiment of the present invention. [Figure 6]FIG. 1 is an explanatory diagram showing a method for removing an underground obstacle and a method for driving a steel sheet pile by a pile auger method according to an embodiment of the present invention. [Figure 7] FIG. 1 is an explanatory diagram showing a method for removing an underground obstacle and a method for driving a steel pipe pile using a hydraulic pile hammer method according to an embodiment of the present invention. [Figure 8] FIG. 2 is a diagram showing an excavation layout in stages according to the underground obstacle removal method of the embodiment of the present invention. [Figure 9] FIG. 2 is an excavation layout diagram for driving steel sheet piles using the underground obstacle removal method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 4 show a method for removing an underground obstacle according to an embodiment of the present invention. First, as shown in Fig. 3, two guide piles 1 are driven vertically with a vibro hammer into positions sandwiching the location where the obstacle G to be removed is buried. Next, as shown in Fig. 4(A), a rectangular guide frame 2 is installed on the top of the guide piles 1. The obstacle G is, for example, a hard bedrock.

[0016] As shown in FIG. 1(A), a hydraulic auger 3 is used to form a vertical hole above an obstacle G in the ground inside a guide frame 2 (vertical hole forming process). After the vertical hole forming process, as shown in FIG. 1(B), a vibro hammer 4 is used to insert a hole wall protection tube 11 into the vertical hole, approaching the top of the obstacle G (hole wall protection process). As shown in FIG. 1(C), the hole wall protection tube 11 is installed along the hole wall of the vertical hole. In one example, the hole wall protection tube 11 is 4.0 m long and 700 mm in diameter. After the hole wall protection process, as shown in FIG. 1(D), a sheath tube 12 is inserted into the hole wall protection tube 11 with its central axis parallel to that of the hole wall protection tube 11, and the lower end of the sheath tube 12 is installed near the top of the obstacle G (sheath tube installation process).

[0017] In the sheath tube installation process, a sheath tube device 20 is used. The sheath tube device 20 has a base and multiple (two in one example) sheath tubes 12. The base has two support members that are parallel to each other. The base can be supported by the upper end of the hole wall protection tube 11, and is installed on the upper end of the hole wall protection tube 11 so as to be rotatable along the opening of the hole wall protection tube 11. The sheath tube 12 has its upper part sandwiched between the two support members and is fixed to the support members. In one example, the sheath tube 12 is 3.0 m long and approximately 270 mm in diameter.

[0018] A plurality of disks 21 that are slidably fitted along the inner circumference of the hole wall protection tube 11 are provided at intervals on the sheath tube 12 below the base of the sheath tube device 20. A rib that extends vertically and is fixed to the sheath tube 12 is fixed to the disk 21, and the disk 21 is provided perpendicular to the central axis of the sheath tube 12. Two holes of the same diameter are formed in the disk 21 at positions point-symmetrical with respect to the center of the disk 21, and the sheath tube 12 is inserted into each hole. In the sheath tube installation process, the base of the sheath tube device 20 is installed at the opening at the upper end of the hole wall protection tube 11. As a result, the plurality of sheath tubes 12 are inserted into the hole wall protection tube 11 and extend parallel to each other in the length direction of the hole wall protection tube 11.

[0019] After the sheath tube installation process, as shown in Fig. 1 (D) (E), a rod 14 having a rock drilling section 13 at its lower end is inserted into the sheath tube 12, and the rod 14 is reciprocated in the direction of the central axis inside the sheath tube 12 to crush the obstacle G with the rock drilling section 13 (obstacle crushing process). Fig. 3 shows the state in which an underground obstacle is being removed. The rod 14 having the rock drilling section 13 at its lower end is, for example, a down-the-hole hammer as shown in Fig. 3. The down-the-hole hammer has a length of 9.0 m and a diameter of about 220 mm, for example. The down-the-hole hammer is attached to a hydraulic auger 3, and can crush, excavate, and drill holes by injecting a high-pressure compressor and using rotational and reciprocating motions (piston motions). The crushing of the obstacle G is performed by crushing and excavating the obstacle G to its bottom. Finely crushed rock powder is collected inside the hole wall protection pipe 11 instead of on the ground by the air blow, and is used as interfacial filling in the completed drilled vertical hole to help prevent the collapse of surrounding boulders and boulders. Water and drilled powder from the air blow are collected inside the hole wall protection pipe 11, so there is little impact on structures and the surrounding ground. By performing crushing, drilling, and perforation inside the sheath pipe 12, the amount of drilling air is reduced, the discharge pressure is increased, and the drilling time can be shortened.

[0020] After the obstacle crushing process, the rod 14 is pulled out from the sheath tube 12 (rod pulling process). After the rod pulling process, the rod 14 is inserted into another sheath tube 12 of the sheath tube 12 into which the rod 14 was previously inserted (i.e., the sheath tube 12 into which the rod 14 was inserted in the obstacle crushing process), and the rod 14 is reciprocated in the central axis direction inside the other sheath tube 12 to crush the obstacle G in the rock drilling section 13 (obstacle crushing and other processes). After the obstacle crushing and other processes, the rod 14 is pulled out from the other sheath tube 12 (rod pulling and other processes).

[0021] After the rod extraction and other steps, the base of the sheath tube device 20 is rotated and installed along the opening of the hole wall protection tube 11, and the sheath tube 12 is installed at a position horizontally shifted from the previous installation position (i.e., the position installed in the sheath tube installation step in the hole wall protection tube 11) with the central axis of the hole wall protection tube 11 and the central axis of the sheath tube 12 parallel to each other, and the lower end of the sheath tube 12 is installed close to the top of the obstacle G (sheath tube moving step). At this time, it is preferable that the sheath tube 12 is installed so as to be in contact with the inner circumference of the hole wall protection tube 11 within 10 cm, for example, and the trajectory of the sheath tube 12 goes around the inner circumference of the hole wall protection tube 11 while overlapping with the adjacent trajectories, and the sheath tube 12 is moved and installed so that the inside surrounded by the trajectory of the sheath tube 12 that has gone around once is filled with the trajectory of the sheath tube 12. When the base of the sheath tube device 20 is rotated along the opening of the hole wall protection tube 11 in the sheath tube moving step, the disk 21 slides along the inner circumference of the hole wall protection tube 11, so that the disk 21 can be rotated about the central axis of the hole wall protection tube 11 to move the sheath tube 12. For example, as shown in Fig. 4(A), by rotating two sheath tubes 12 by 60 degrees each, the sheath tubes 12 can be installed all over the lower part of the hole wall protection tube 11 except for the center.

[0022] After the sheath tube moving step, the obstacle crushing step, the rod withdrawing step, the obstacle crushing other step, the rod withdrawing other step, and the sheath tube moving step are repeated (crushing repetition step). In the obstacle crushing other step, the rod 14 is inserted into the sheath tube 12 other than the sheath tube 12 into which the rod 14 was inserted in the obstacle crushing other step and into the sheath tube 12 other than the sheath tube 12 into which the rod 14 was inserted in the previous obstacle crushing other step. In addition, in the repeated crushing process, in the sheath tube moving process, the sheath tube 12 is installed at a position horizontally shifted from the position installed in the sheath tube installation process and also at a position horizontally shifted from the position installed in the previous sheath tube moving process. After the repeated crushing process, the rod 14 is pulled out from the sheath tube 12, and the sheath tube 12 is pulled out from the hole wall protection tube 11 (sheath tube pulling process). After the sheath tube pulling process, backfill sand 6 is poured into the hole wall protection tube 11 by the hydraulic excavator 5, as shown in FIG. 2(F).

[0023] Once the crushing of the lower obstacle G has been completed with one hole wall protection pipe 11, a vertical hole is formed at a distant position and the above process is repeated. Next, as shown in Fig. 2(G), the hole wall protection pipe 11 is pulled out from the vertical hole. Then, as shown in Fig. 4(B), vertical holes 7 are formed between each vertical hole 7, and the vertical holes 7 are connected horizontally. As shown in Fig. 2(H), a hydraulic pile hammer 8 or the like can be used to drive steel pipe piles 9 or the like into the positions of the connected vertical holes 7.

[0024] In the underground obstacle removal method according to the embodiment of the present invention, by using the sheath pipe device 20, multiple sheath pipes 12 can be easily installed in the sheath pipe installation step, and the sheath pipes 12 can be easily installed at horizontally shifted positions in the sheath pipe moving step. Since multiple sheath pipes 12 can be installed simultaneously, the number of sheath pipe moving steps can be reduced, improving work efficiency. It can also be used in cases where the ground above the surface is soft and prone to collapse, or where excavation precision needs to be ensured.

[0025] In the obstacle crushing process, the rod 14 is reciprocated inside the sheath tube 12 inserted into the hole wall protection tube 11, and the rock drilling section 13 at the lower end of the rod 14 crushes the obstacle G below the sheath tube 12. In the rod withdrawal process, the rod 14 is withdrawn from the sheath tube 12, and in the sheath tube movement process, the sheath tube 12 is set in a horizontally shifted position. In the repeated crushing process, the obstacle crushing process, the rod withdrawal process, and the sheath tube movement process are repeated. In this way, the obstacle G below the hole wall protection tube 11 is crushed. The obstacle G is crushed below the sheath tube 12, and the sheath tube 12 is set inside the hole wall protection tube 11, so that the rock blocks, boulders, and boulders around the hole wall are less likely to collapse when the sheath tube 12 is moved when removing the obstacle, and new obstacles G are less likely to be generated in the hole. In addition, noise and vibration caused by the obstacle removal work can be reduced by being blocked by the sheath tube 12 and the hole wall protection tube 11. If the work is performed with the hole wall protection tube 11 covered with a lid material such as a sheet, noise and vibration can be further reduced.

[0026] The number of sheath tubes 12 may be two or three or more. In the case of two, it is preferable that the sheath tubes 12 are provided at the base of the sheath tube device 20 so that they are symmetrically positioned with respect to the central axis of the sheath tube 12 when the base of the sheath tube device 20 is installed at the opening of the hole wall protection tube 11. In the case of three or more, it is preferable that the sheath tubes 12 are provided at the base of the sheath tube device 20 so that they are evenly arranged around the central axis of the sheath tube 12 when the base of the sheath tube device 20 is installed at the opening of the hole wall protection tube 11. In the case of three or more sheath tubes 12, in the crushing repetition step, the obstacle crushing step and the rod withdrawal step are repeated until the rod 14 is inserted into all the moved sheath tubes 12 to crush the obstacle G.

[0027] The underground obstacle removal method according to the embodiment of the present invention can be applied to driving steel sheet piles using the vibro hammer method shown in FIG. 5, driving steel sheet piles using the pile auger method shown in FIG. 6, driving steel pipe piles using the hydraulic pile hammer method shown in FIG. 7, and may also be applied to other civil engineering works. The underground obstacle removal method according to the embodiment of the present invention can be carried out in stages, for example, as shown in Fig. 8, in the order of (1) first-stage excavation, (2) completion of first-stage excavation, (3) second-stage excavation, and (4) completion of second-stage excavation. In one example, as shown in Fig. 9, underground obstacles can be removed and excavation can be performed for driving steel sheet piles. [Explanation of symbols]

[0028] G obstacle, 1 guide pile, 2 guide frame, 3 hydraulic auger, 4 vibro hammer, 5 Hydraulic excavator, 6 Backfill sand, 7 Vertical hole, 8 Hydraulic pile hammer, 9 Steel pipe pile, 11 hole wall protection pipe, 12 sheath pipe, 13 rod, 14 rock drilling section, 20 sheath tube apparatus, 21 disk

Claims

1. 1. An underground obstacle removal method for removing underground obstacles, comprising: a vertical hole forming step of forming a vertical hole above the obstacle in the ground; a hole wall protection step of inserting a hole wall protection tube into the vertical hole close to above the obstacle after the vertical hole forming step; After the hole wall protection step, a sheath tube is inserted into the hole wall protection tube so that the central axis of the sheath tube is parallel to the central axis of the hole wall protection tube, and the lower end of the sheath tube is placed close to the top of the obstacle; After the sheath pipe installation process, a rod having a rock drilling portion at its lower end is inserted into the inside of the sheath pipe, and the rod is reciprocated in the central axis direction inside the sheath pipe to crush the obstacle with the rock drilling portion; a rod extracting step of extracting the rod from the sheath tube after the obstacle crushing step; a sheath tube moving step of installing the sheath tube at a position horizontally shifted from the previously installed position in the hole wall protection tube after the rod withdrawal step, with the central axis of the hole wall protection tube and the central axis of the sheath tube parallel to each other and the lower end of the sheath tube being close to the top of the obstacle; a crushing repeating step of repeating the obstacle crushing step, the rod withdrawal step, and the sheath tube moving step after the sheath tube moving step; After the repeated crushing step, the rod is pulled out from the sheath tube, and the sheath tube is pulled out from the hole wall protection tube. A method for removing an underground obstacle, comprising:

2. A sheath tube device has a base portion that is installed at the opening of the hole wall protection tube, and a plurality of sheath tubes that are provided at the base portion and extend parallel to each other, In the sheath tube installation step, the base of the sheath tube device is installed at the opening of the hole wall protection tube, and a plurality of the sheath tubes are inserted into the hole wall protection tube with the central axis of the hole wall protection tube and the central axis of the sheath tube parallel to each other, and the lower end of the sheath tube is installed close to the top of the obstacle; After the rod extraction process, the rod is inserted into another sheath tube of the sheath tube into which the rod was previously inserted, and the rod is reciprocated in the direction of the central axis inside the other sheath tube to crush the obstacle with the rock drilling section. and a rod extraction step of extracting the rod from the other sheath tube after the obstacle crushing step. In the sheath tube moving step, after the rod extraction step, the base is rotated and set along the opening, In the crushing repeating step, the obstacle crushing step, the rod withdrawing step, the obstacle crushing other step, the rod withdrawing other step, and the sheath tube moving step are repeated, 2. The underground obstacle removal method according to claim 1.

3. A sheath pipe device used in an underground obstacle removal method for removing underground obstacles, comprising: A base is rotatably installed along an opening of a hole wall protection pipe inserted into a vertical hole formed above the obstacle in the ground; A plurality of sheath tubes are provided on the base and are inserted into the hole wall protection tube when the base is installed in the opening, and extend parallel to each other in the longitudinal direction of the hole wall protection tube. A sheath tube device comprising:

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