JP5384223B2 - How to install pipes on natural ground - Google Patents

Description

  The present invention relates to a method of installing a pipe on a natural ground where a long pipe can be easily installed in the natural ground.

In general, when a tunnel is dug into a soft ground, the ground in front of the face is reinforced prior to tunnel excavation. As an example of the natural ground reinforcement method for reinforcing the natural ground in this way, there is an injection type long tip receiving method. As shown in FIG. 6A, this construction method uses an excavator 60 such as a drill generally used for tunnel excavation in a natural ground 50 in front of the face 71, and an elevation angle of about 5 degrees from the back of the support 51. And a plurality of steel pipes 52 are driven while being connected, an injection pipe (not shown) is inserted into the pipe 52 to inject an injecting agent into the natural ground 50, and the natural ground 50 is reinforced. As shown in FIG. 6 (b), a long tube 53 connected to a plurality of tubes 52 is installed in a range of necessary reinforcement along the top edge of the face, and then the long tube 53 is filled with a filler. And reinforce. The angle range when the necessary range of reinforcement along the top edge of the face shown in FIG. 6B is viewed from the center of the face is called an improved range θ, and the improved range θ is approximately 120 degrees. .
When installing the long tube 53, for example, as shown in FIG. 7A, a rod 13 having a bit 13a as a drilling means is inserted into the tube 52 as shown in FIG. The end 13 is connected to a rock drill 61 mounted on the guide cell 62 of the excavator 60, and the bit 13 a is connected to the ground 50 by the rotational force and striking force transmitted from the rock drill 61 to the bit 13 a via the rod 13. The tube 52 is inserted into the natural ground 50 while drilling. At this time, a long pipe 53 is installed by sequentially adding pipes 52 having a length of about 3 m. Further, in order to extend and construct the support work 51, it is necessary to remove the lower part of the pipe 52 from the support work 51. Therefore, in order to facilitate the removal work, as shown in FIG. In addition, the tube 54 at the rearmost end of the long tube 53 is made of a resin tube such as a vinyl chloride tube that can be easily crushed instead of the tube 52 (see, for example, Patent Documents 1 and 2).
In the above-described injection-type long tip receiving method, a plurality of pipes 52 are added to form a long pipe 53, so that a desired installation angle cannot be obtained. This is not only difficult, but it takes time and labor to connect the pipes 52 and 52, so that there is a problem that work efficiency is poor. Therefore, it is conceivable to prepare a long pipe 53 of about 9 m in advance and insert it into the natural ground 50. In this case, in order to install the long pipe 53 in the natural ground 50, the stroke is large. It is necessary to prepare a large excavator. However, a large excavator is expensive and not only takes time and effort to equip, but also using a large rock drill, the long excavator is long along the top face of the face of the tunnel cavity 70. It is practically difficult to place a large number of tubes 53 except when the diameter of the tunnel cavity 70 is considerably large.
Therefore, in order to enable the long pipe 53 to be accurately installed in the natural ground 50 without using a large excavator, the applicant of the present invention has made the face 71 of the tunnel cavity 70 and the inner wall surface 76 of the tunnel cavity 70. After the guide pipe is installed obliquely forward from the face 71 near the boundary to the tunnel excavation direction, a steel long pipe 53 that is longer than the guide pipe and has a smaller diameter is connected to the ground 50 through the guide pipe. The injection agent is injected from the inside of the guide tube and the long tube 53 into the natural ground 50 around the guide tube and the long tube 53, so that the natural ground 50 around the guide tube and the long tube 53 is removed. A long tip receiving method for reinforcement has been proposed (see, for example, Patent Document 3).

JP 2000-186490 A JP 2003-155888 A JP 2006-176888 A

However, the invention of Patent Document 3 has a problem that it is difficult to handle the tube because the long tube 53 having a long total length is used.
The present invention has been made in view of the above problems, and connects a plurality of pipes by using an easy-to-handle pipe that can change the total length of the pipe before and after being fed into the natural ground. Therefore, it is intended to provide a method for installing a pipe on a natural ground where a long pipe can be easily installed within the natural ground.

The present invention reinforces the natural ground by installing a pipe with a through hole penetrating the inner peripheral surface and the outer peripheral surface into the natural ground from the tunnel cavity and injecting the ground improvement material into the natural ground via the through hole. tube placed in the installation method of the tube to the natural ground, and a multi-tube body having an outer tube and an inner tube center is arranged to the same as a tube, the plurality pipe into natural ground in the case of The pipe installation device is attached to one of the opening portions of the inner pipe or the outer pipe and the driving force of the inner pipe or the outer pipe of the plurality of tubular bodies. A rock drilling machine comprising a propulsive force transmission unit that transmits to a pipe, a rock drill, a striking rotation transmission shaft that transmits a striking rotational force from the rock drill to the excavation unit, and a pressing member that presses a plurality of tubular bodies. , And the striking rotational force from the rock drill is transmitted to the excavation bit of the excavation part via the striking rotation transmission shaft. Digging and transmitting the propulsive force of the digging portion to one of the inner tube and the outer tube of the plurality of tubular bodies via the propulsive force transmitting portion and of the inner tube and the outer tube of the plurality of tubular bodies by a pressing member By pressing the other side, the inner and outer pipes of the multiple pipes are sent together into the ground, and if the rear end side of the multiple pipes is positioned on the face, the excavation is stopped and the multiple pipes sent into the ground are After fixing the other of the outer pipe and the inner pipe to the ground, the excavation is resumed and only one of the outer pipe and the inner pipe is further advanced to make it longer than the total length of the outer pipe or the inner pipe. Since multiple tubes as tubes formed in the full length were installed in the natural ground, long tubes can be easily installed in the natural ground, and it is possible to prevent the outer tube and the inner tube from proceeding together, Only one of them can be reliably advanced.
Since the outer tube and the inner tube having the same total length are used, the end of the outer tube and the end of the inner tube are aligned, that is, a plurality of tubes are overlapped (wrapped) over the entire length. The difference in length between the total length of the multiple tubes in the pre-extension state, which is a tube, and the total length of the multiple tubes in the post-extension state in which only one of the outer tube and the inner tube is advanced by a predetermined amount Since it can be enlarged, it becomes easy to handle a plurality of tubes in a state before extension, and a long tube having a length of about two times the total length of the plurality of tubes in a state before extension can be installed on a natural ground. .

Process drawing which shows the procedure of the installation method of the pipe | tube to a natural ground (embodiment 1). (A) is sectional drawing which shows the multiple tube body and pipe installation apparatus before expansion | extension, (b) is sectional drawing which shows the multiple pipe body and pipe installation apparatus after expansion | extension (Embodiment 1). Sectional drawing which shows the other example of a multiple pipe body (Embodiment 2). Sectional drawing which shows the relationship between the multiple pipe body and the excavation part in the case of making an outer pipe advance independently (Embodiment 3). The figure which shows the multiple tube body provided with the 3 or more pipe | tube (Embodiment 4). The figure which shows the outline | summary of the conventional long tip receiving method. The figure which shows the installation method of the conventional long tube.

Embodiment 1
As shown in FIGS. 1 and 2, the pipe installation method on the natural ground according to the first embodiment uses a plurality of pipe bodies 1 and a pipe installation device 2.

As shown in FIG. 2, the multi-tubular body 1 includes an inner tube 11 and an outer tube 12 formed of, for example, a steel pipe having an annular cross section. The inner tube 11 and the outer tube 12 include a plurality of through holes (not shown) penetrating the inner peripheral surface and the outer peripheral surface, and these through holes function as injection holes. The multi-tubular body 1 has a configuration including an outer tube 12 and an inner tube 11 that are arranged coaxially so that the center line C of the tube is the same. The multi-tube body 1 is configured such that the inner tube 11 positioned inside the outer tube 12 is movably provided along the center line C of the tube in the outer tube 12 so that the total length of the tube is variable. It is a tube. That is, after the plurality of tubular bodies 1 are installed in the natural ground 50, for example, the inner tube 11 alone is further advanced to form a long tube 1X having a full length longer than the full length of the outer tube 12 or the inner tube 11. It is a configuration. That is, the multi-tube body 1 is formed by fixing the outer tube 12 to the natural ground 50 from the pre-extension state, which is a complete double tube in which the outer tube 12 and the inner tube 11 are overlapped (wrapped) over the entire length. 11 is a polymerization tube that changes to a post-elongation state in which the front end portion of the outer tube 12 and the rear end portion of the inner tube 11 are polymerized by allowing only 11 to advance.
The inner tube 11 and the outer tube 12 are formed of tubes having the same overall length. As described above, when the multiple tubes 1 are configured using the outer tube 12 and the inner tube 11 having the same overall length, the end of the outer tube 12 and the end of the inner tube 11 are aligned, that is, The outer tube 12 and the inner tube 11 are completely double tubes that are superposed over the entire length, and the entire length of the multiple tubes 1 in the pre-extension state, and the outer tube 12 is fixed to the ground 50 and only the inner tube 11 is scheduled. Thus, the difference in length from the full length of the plurality of tubular bodies 1 in the state after being fully extended can be increased. Therefore, it becomes easy to handle the multiple tubes 1 in the pre-extension state, and the long tube 1X having a length of about twice the total length of the multiple tubes in the pre-extension state can be installed in the natural ground 50. Become. For example, the inner tube 11 has a length of 6.5 m, an outer diameter of 101.6 mm, and an inner diameter of 90.2 mm. The outer tube 12 has a length of 6.5 m, an outer diameter of 114.3 mm, and an inner diameter of 105. When a 3 mm tube is used, the multi-tube body 1 can be configured such that the overall length changes from 6.5 m in the pre-extension state to 12 m in the post-extension state.

  As shown in FIG. 2, the pipe installation device 2 includes an excavation part 21, a propulsive force transmission part 22 called a casing top that transmits the propulsive force of the excavation part 21 to the inner pipe 11, and an impact rotation transmission shaft. A rod 23, a rock drill 24, a rotation anti-vibration member 25, and a pressing member 26 are provided.

  The excavation part 21 includes an excavation component part 32, a striking rotation transmission mechanism part 33, and a cylindrical case 34 in which the striking rotation transmission mechanism part 33 is built. The excavation component 32 includes a excavation bit 31 at the front end. The striking rotation transmission mechanism 33 is connected to the front end of the rod 23 and transmits the striking rotational force from the rock drill 24 transmitted by the rod 23 to the excavation component 32.

  The propulsive force transmission unit 22 is formed of, for example, a steel pipe having an annular cross section, and is attached to one opening (hereinafter referred to as a front end opening) of the inner tube 11. The propulsion force transmission unit 22 is formed so that the inner diameter dimension is smaller than the inner diameter dimension of the inner tube 11, and the outer diameter dimension of one opening (hereinafter referred to as the front end opening) is the same as the outer diameter dimension of the inner tube 11. In addition, the outer diameter dimension of the other opening (hereinafter referred to as rear end opening) side portion is formed to be smaller than the inner diameter dimension of the inner tube 11. The rear end opening side portion of the propulsive force transmitting portion 22 is located at the front opening portion of the inner tube 11 so that the outer peripheral surface of the rear end opening side portion of the propulsive force transmitting portion 22 contacts the inner peripheral surface of the inner tube 11. While being fitted inside, the propulsive force transmitting portion 22 and the inner tube 11 are connected by a connecting means such as welding or adhesive.

  The outer peripheral surface of the cylindrical case 34 of the digging portion 21 is provided with a case-side engaging portion 35 protruding from the outer peripheral surface, and the case-side engaging portion 35 and the inner peripheral surface and inner surface of the propulsive force transmitting portion 22 are provided. The engaging portion 36 on the propulsive force transmitting portion 22 side formed by the step portion between the inner peripheral surface of the tube 11 and the engaging portion 36 are engaged with each other, so that the cutting transmitted to the cylindrical case 34 via the rod 23 is performed. The propulsive force from the rock machine 24 is transmitted to the propulsive force transmitting portion 22 and the inner pipe 11 through the engaging portions 35; 36, so that the inner pipe 11 also advances with the progress of the excavating portion 21. .

  For example, the rotation anti-vibration member 25 is formed in a columnar shape having a through hole 39 through which the rod 23 passes. On the circumferential surface of the cylinder, a groove for draining mud (not shown) extending in the length direction of the cylinder is provided, and the excavated earth and sand and water can be discharged through the groove. The rotational anti-vibration member 25 has a diameter of a circular cylinder that is slightly smaller than the inner diameter of the inner tube 11. Therefore, the rod 23 penetrates the through hole 39 of the rotation anti-vibration member 25 so that the rotation anti-vibration member 25 can rotate together with the rod 23, or the rotation anti-vibration member 25 does not rotate together with the rod 23. As described above, the rotational anti-vibration member 25 and the rod 23 are connected. Therefore, the inner peripheral surface of the inner tube 11 and the outer peripheral surface of the rotary anti-vibration member 25 come into contact with the excavation of the excavating portion 21, thereby preventing the inner tube 11 from swinging when the inner tube 11 travels. The

  The pressing member 26 is formed, for example, in a circular box shape with one end opening and the other end closed. For example, when the rod 23 is propelled, the pressing member 26 can be propelled together with the rod 23 and is attached to the rod 23 so as not to receive the rotational force from the rod 23. Until the end surface 1a reaches the face 71, the rear end surface 12a of the outer tube 12 of the multi-tubular body 1 is pushed as the rod 23 advances. For example, an annular groove 42 is formed on the outer peripheral surface of the cylinder of the cylindrical connector 41 that connects the rod 23a and the rod 23a, and the two halves of the circular box body into which the pressing member 26 can be divided into two. Formed by the body 43; 43. Then, by inserting the hole edge 44 of the half through hole of the half body 43 into the annular groove 42 and connecting the two half bodies 43; 43, the rod 23 can be propelled together with the rod 23, and The pressing member 26 that does not receive the rotational force from the rod 23 can be realized.

For example, the rotation anti-vibration member 25 is attached to the front end side of one unit rod 23a that becomes the front end side rod 23t, the digging portion 21 is connected to the front end of the unit rod 23a, and the rear end portion of the front end side rod 23t is connected. Subsequent unit rods 23a are sequentially connected to form a rod 23 that is longer than the entire length of the inner tube 11, and then the digging portion 21 connected to the distal end of the distal end side rod 23t of the rod 23 is connected to the other opening of the inner tube 11. It inserts into the inside of the inner pipe | tube 11 (henceforth a rear-end opening), sends it toward the front-end | tip opening of the inner pipe | tube 11, and engages the engaging parts 35; 36. As a result, the excavation component 32 protrudes forward from the tip opening of the inner tube 11. In this state, the pressing member 26 is attached to the connecting rod 41 that connects the unit rod 23a or the unit rod 23a and the unit rod 23a located behind the plurality of tubular bodies 1.
A muddy water discharge port 45 is formed on the outer peripheral surface of the circle of the pressing member 26, one end of the suction pipe 46 and the muddy water discharge port 45 are connected, and the other end of the suction pipe 46 and a suction device (not shown) are connected. Connected.

  The rock drill 24 is attached to the guide cell 47 so as to be movable on a guide cell 47 attached to a beam of a drilling machine such as a drill jumbo (not shown). The rear end of 23 is connected by a connector 48.

Next, with reference to FIG. 1; FIG. 2, the installation method of the multiple tube body 1 is demonstrated.
First, as shown in FIG. 1, the rotational anti-vibration member 25 is attached to the distal end side of the rod 23, and the digging portion 21 is connected to the distal end of the rod 23, and the digging portion 21 is connected to the inner tube 11 of the plurality of tubular bodies 1. The engagement portion 35 of the digging portion 21 and the engagement portion 36 of the inner tube 11 are engaged with each other by being inserted into the inner tube 11 from the rear end opening. After the pressing member 26 is attached to the rear end side of the rod 23 protruding rearward from the rear end opening of the inner pipe 11, the output shaft of the rock drill 24 and the rear end of the rod 23 are connected by a connector 48. A leading hole 72 is formed in advance at the entrance position where the pipe is to be installed in the face 71 (see FIG. 1A).
As shown in FIG. 1B, after the excavating component 32 is inserted into the preceding drilling hole 72, the rock drill 24 is operated to start excavation. At this time, as shown in FIG. 1C, the inner tube 11 of the plurality of tubes 1 travels in the ground so as to be pulled by the digging portion 21, and the outer tube 12 of the plurality of tubes 1 is connected to the rod 23. At the same time, it is pushed by the pressing member 26 that moves into the ground, so that it travels in the ground together with the inner tube 11. If the rear end side of the multi-tubular body 1 is positioned on the face 71, the excavation by the rock drilling machine 24 is stopped, the pressing member 26 is removed, and the rear end portion 12 e side of the outer pipe 12 is fixed to the ground 50 with the fixture 73. (See FIG. 1D).
Thereafter, the excavation is resumed and the inner pipe 11 is independently advanced. The inner tube 11 is propelled until the rear end portion of the inner tube 11 is positioned at the front end portion of the outer tube 12 so that the entire inner tube 11 does not protrude from the outer tube 12. For example, if it is confirmed from the position of the rod 23 that the front end of the inner pipe 11 has reached a position 12 m away from the face 71, the excavation is terminated and the excavation part 21 is returned into the tunnel cavity 70. As a result, a 12 m long tube 1 </ b> X in which the outer tube 12 and the inner tube 11 are continuous is installed in the natural ground 50.
Then, as shown in FIG. 1 (e), after inserting the injection tube 75 inside the long tube 1X, the rear end opening of the outer tube 12 is opened so that the injection liquid does not leak from the rear end opening of the outer tube 12. While caulking 76, the gap between the outer peripheral surface of the rear end of the outer tube 12 and the natural ground 50 is caulked. Thereafter, the ground improvement material is injected into the long pipe 1X by the injection pipe 75, so that the ground improvement material is injected into the natural ground 50 around the long pipe 1X through the injection hole not shown above. The natural ground 50 around the long tube 1X is improved, and the natural ground 50 is reinforced.
For example, as shown in FIG. 1 (d), the rear end portion 12 e of the outer tube 12 protrudes from the face 71 into the tunnel cavity 70, and the rear end portion of the outer tube 12 is formed from the inside of the outer tube 12. The fixing tool 73 may be constituted by a protruding rod that is provided so as to protrude from the outer peripheral surface of the outer tube 12 through a through-hole that is provided on the side of 12e and is engaged with the face 71, or the outer tube. 12 through the through hole (not shown) provided on the rear end 12e side of the outer tube 12 from the inner side of the outer tube 12, and enters the natural ground 50 from the outer peripheral surface of the outer tube 12, and is fixed by the protruding rod fixed to the natural mountain. 73 may be configured. In these cases, after the rear end side of the plurality of tubular bodies 1 is positioned on the face 71, only the inner tube 11 is slightly advanced so that the rear end portion 12e of the outer tube 12 and the inner tube 11 do not wrap. The fixing tool 73 is attached. Further, if the fixing tool 73 is configured by a protruding body such as a collar part outside the figure that protrudes from the outer peripheral surface at the rear end portion of the outer tube 12 and engages with the face 71, installation work of the fixing tool 73 can be made unnecessary. Become efficient.

According to the pipe installation method according to the first embodiment, the multiple tubes 1 are used as easy-to-handle pipes that can change the overall length of the pipe before being inserted into the natural ground 50 and after being inserted into the natural ground 50. Therefore, the long pipe 1X of about 12 m can be easily installed in the natural ground 50 without connecting a plurality of pipes as in Patent Documents 1 and 2.
Moreover, it is not necessary to handle the long tube 53 of about 9 m to 12 m which is difficult to handle in the tunnel cavity 70 which is a narrow space as in Patent Document 3, and a plurality of tubes of 6.5 m or less that are easy to handle compared to Patent Document 3. Using the body 1, a long tube of about 12 m can be easily installed in the natural ground 50.
In addition, since the outer tube 12 that is not advanced among the plurality of pipes 1 fed into the natural mountain 50 is fixed to the natural mountain 50, only the inner tube 11 is further advanced, so that the outer tube 12 and the inner tube 11 are both It is possible to prevent the advancement, only the inner tube 11 can be reliably advanced, and the long tube 1X in the natural ground 50
Can be installed reliably.

In addition, when a long pipe 53 of about 9 m to 12 m is used as in Patent Document 3, it is difficult to feed such a long pipe 53 from the beginning to the natural ground 50 with the rock drill 24, so that the guide A gripping device for feeding the long tube 53 to the natural ground 50 at the tip side of the cell 47 is required. Since this gripping device is expensive and the removal of the gripping device is cumbersome, there are cases where a lock bolt is placed or supported while the gripping device is attached to the guide cell 47. There was also the problem of being damaged. Moreover, in patent document 3, since the installation work of the guide pipe | tube and the installation work of the elongate pipe | tube 53 must be performed separately, there also existed a problem that the installation work of a pipe | tube was complicated.
On the other hand, according to the first embodiment, since the multiple pipe body 1 of 6.5 m or less configured by the inner pipe 11 and the outer pipe 12 of 6.5 m or less is used, it is necessary to use the above-described gripping device. Since this is eliminated, the above-mentioned problems can be solved. Moreover, since it is only necessary to perform the installation work of the plurality of pipes 1, the pipe installation work is easy.

Embodiment 2
As shown in FIG. 3, a multi-tubular body 1 including an engaging portion 84 that engages with an end portion of the inner tube 11 and an end portion of the outer tube 12 may be used. When such a multiple tube body 1 is used, it is possible to prevent the inner tube 11 and the outer tube 12 from being separated by the engaging portion 84, so that it is a long length for injecting the ground improvement material into the ground. The tube 1X can be reliably installed on the natural ground 50.

Embodiment 3
In the first and second embodiments, the digging portion 21 and the inner pipe 11 are engaged and the inner pipe 11 is independently advanced. However, as shown in FIG. 4, the digging portion 21 and the outer pipe 12 are engaged. The outer tube 12 may be independently advanced.

Embodiment 4
You may use the multiple tube body 1 comprised by the 3 or more pipe | tube. For example, as shown in FIG. 5, the outer tube 12 and the two inner tubes 11 provided on the inner side of the outer tube 12, or the two inner tubes 11 provided on the outer side of the inner tube 11 and the inner tube 11. You may use the comprised multiple tube body 1. FIG. In this case, for example, the end of one tube and the end of the other tube engage with each other so that the ends of the three tubes 81; 82; 83 are not separated from each other. Such an engaging portion 84 is provided.

  The excavation component 32 may be a recovery type that can collect all of the excavation bit 31 after excavation, or a lost bit type that leaves part or all of the excavation bit 31 on the distal end side of the pipe after excavation. May be used.

  It is good also as a structure which does not pull the inner pipe | tube 11 and the outer pipe | tube 12 by the digging part 21. FIG. For example, until the rear end surface 1a of the multi-tubular body 1 reaches the face 71, a pressing member that presses the rear end face 1a of the multi-tubular body 1 is used, and after the rear end surface 1a of the multi-tubular body 1 reaches the face 71 May be configured to use a pressing member that presses only the rear end surface of the tube to be independently advanced.

In addition, although the injection | pouring pipe | tube 75 was inserted in the multiple pipe body 1 and the ground improvement material was injected, you may inject | pour a ground improvement material using a packer. For example, the expansion member is made of a material that is easily expanded, such as urethane.
Moreover, although the example using the pressing member 26 which advances with the rod 23 was shown, the rod 23 penetrates in the center of the bottom face which is formed in a circular box shape with one end opening and the other end closed. A non-illustrated pressing member that is attached to the rod 23 through the through-hole and a non-illustrated pressing rod that is attached to the rock drilling machine 24 to press the pressing member. It is good also as a structure that a press member presses the rear-end surface 1a of the multiple pipe body 1 by pressing a press member with the push bar of the rock machine 24. FIG.
In the above description, the post-extension state is a state where the rear end portion of the inner tube 11 is propelled until it is positioned at the distal end portion of the outer tube 12, but the post-extension state is the state where the inner tube 11 and the outer tube 12 are connected. It suffices if the part to be polymerized (wrapped) remains. For example, the state after extension may be a state in which the distal end portion of the inner tube 11 slightly protrudes from the distal end of the outer tube 12. That is, in the present invention, the range in which the inner tube 11 and the outer tube 12 wrap can be freely selected.

  As described with reference to FIG. 6, the pipe is installed in the natural ground according to the present invention from the face or inner wall surface near the boundary between the face of the tunnel cavity and the inner wall surface of the tunnel cavity along the tunnel excavation progressing direction. In addition to being able to be used for the tip-receiving method to prevent collapse around the tunnel by installing a pipe in the natural ground in a direction that is gradually away from the straight line, it is parallel to the straight line along the tunnel excavation direction from the face By installing a pipe in the natural ground, it can also be used for a face reinforcement method to prevent collapse in front of the face.

  1 Multiple pipe body, 11 Inner pipe, 12 Outer pipe, 50 Ground, 70 Tunnel cavity.

Claims (2)

When a pipe with a through-hole penetrating the inner and outer peripheral surfaces is installed in the ground from the tunnel cavity, and the ground is reinforced by injecting ground improvement material into the ground via the through-hole In the installation method of the pipe to the mountain,
Using a plurality of tubes including an outer tube and an inner tube arranged to have the same center as a tube, and a tube installation device that installs the plurality of tubes on a natural ground ,
The pipe installation device includes a digging portion having a digging bit at the front end, and a propulsive force that is attached to one opening of the inner pipe or the outer pipe and transmits the propulsive force of the digging portion to the inner pipe or the outer pipe of a plurality of tubular bodies. A transmission unit, a rock drill, a hammer rotation transmission shaft that transmits the hammering rotational force from the rock drill to the excavation unit, and a pressing member that presses the plurality of pipes,
The rock drill is operated, and the striking rotational force from the rock drill is transmitted to the excavation bit of the excavation section through the striking rotation transmission shaft to excavate the ground, and the propulsion force of the excavation section is transmitted to the propulsion transmission section. The inner tube and the outer tube of the plurality of tubular bodies are transmitted to one of the inner tube and the outer tube of the plurality of tubular bodies through the pressure and the other of the inner tube and the outer tube of the plurality of tubular bodies is pressed by the pressing member. If the rear end side of multiple pipes is positioned on the face, the excavation is stopped, and the other of the outer and inner pipes of the multiple pipes sent into the ground is fixed to the ground. Later, the excavation is resumed and only one of the outer pipe and the inner pipe is further advanced, so that a plurality of pipes as a pipe formed to have a full length longer than the entire length of the outer pipe or the inner pipe are formed in the ground. How to install a pipe on a natural ground characterized by its installation . The outer pipe and the inner pipe having the same overall length are used, and the pipe is installed in the natural ground according to claim 1 .

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