JP5213762B2 - Long tip receiving method - Google Patents

Description

  In the present invention, prior to tunnel excavation, a plurality of long pipes are installed in a natural ground in front of the face, and an injection such as a ground solidifying agent is injected into the natural ground from the long pipe to reinforce the natural ground It relates to the long tip receiving method.

In general, when a tunnel is dug into a soft ground, a ground receiving work for reinforcing a natural ground in front of the face 71 is performed prior to tunnel excavation. There is an injection type long tip receiving method as an example of the ground receiving method. As shown in FIG. 16 (a), this construction method uses an excavator 60 such as a drill jumbo generally used for tunnel excavation in the ground 50 in front of the face 71, and is about 5 degrees from the back of the support 51. It is a construction method in which a plurality of steel pipes 52 are connected while being connected at an elevation angle, and an injection pipe (not shown) is inserted into the pipe 52 to inject an injection into the natural ground 50, thereby reinforcing the natural ground 50. As shown in FIG. 16 (b), after installing the long tube 53 connected to the plurality of tubes 52 in the range of necessary reinforcement along the top face of the face, the filler is put in the long tube 53. Fill and reinforce. The angle range when the necessary range of reinforcement along the top edge of the face shown in FIG. 16B 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, as shown in FIG. 17A, the rod 13 having a diameter expanding bit 13 a for drilling is inserted into the tube 52, and the rod 13 The other end side is connected to a rock drill 61 mounted on the guide cell 62 of the excavator 60, and the pipe 52 is inserted into the natural ground 50 while drilling the natural ground 50. At this time, a long pipe 53 is installed by sequentially adding pipes 52 having a length of about 3 m. Also, 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, so that the removal work is facilitated 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 on the ground pile 50 without using a large excavator, the applicant has made the vicinity of the boundary between the face of the tunnel cavity and the inner wall surface of the tunnel cavity. After installing the guide pipe diagonally forward from the face of the tunnel toward the tunnel excavation direction, install a long steel pipe that is longer and smaller in diameter than the guide pipe in the natural ground via the guide pipe. A long tip receiving method has been proposed in which an injecting agent is injected into the ground around the guide tube and the long tube from the inside and inside the long tube to reinforce the ground around the guide tube and the long tube. (For example, refer to Patent Document 3).

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

However, in the invention of Patent Document 3, each time excavation proceeds, a new guide pipe is installed in the natural ground 50, and after installing the long pipe 53, the end of the guide pipe protruding below the support work 51 is used. The tunnel is excavated while breaking the guide tube with a tunnel excavator. That is, since the guide tube is disposable, it is useless and not economical.
The present invention has been made in view of the above problems, and an object of the present invention is to provide an economical long tip receiving method in which a guide tube can be reused (reused).

According to the long tip receiving method according to the present invention, after the guide pipe is installed obliquely upward and forward in the tunnel excavation direction from the face near the boundary between the face of the tunnel cavity and the inner wall surface of the tunnel cavity, the guide In a long tip receiving method in which a long pipe with a diameter smaller than that of the pipe is installed in the ground via the guide pipe to reinforce the ground, a plurality of unit pipes are connected in the longitudinal direction and can be separated as guide pipes. Since a simple guide pipe is used, an economical long tip receiving method in which the guide pipe can be reused can be provided.
Since the unit pipe is configured to be separated into multiple units in the radial direction of the unit pipe by the dividing surface along the center line of the unit pipe, the unit pipe can be easily separated in the radial direction, and the contents in the unit pipe It becomes easy to take out.
Since at least one unit pipe is separated and removed from the guide pipe installed in the natural ground during tunnel excavation, the separated unit pipe can be reused to reconfigure the guide pipe, and the guide pipe can be reused.
At least one unit pipe is separated from the guide pipe installed in the natural ground and recovered along with tunnel excavation, and the unit pipe is reused as a component constituting a new guide pipe. An economical long-ahead receiving method that can be used can be provided.
A component that separates and collects at least one unit pipe from a guide pipe installed in a natural ground during tunnel excavation and separates the unit pipe and uses the separated separation member as a new guide pipe Therefore, the unit pipe can be easily separated in the radial direction, the contents in the unit pipe can be easily taken out, and an economical long tip receiving method in which the guide pipe can be reused can be provided.

The perspective view of a guide tube. The perspective view which shows from the state which disassembled the guide tube to the state assembled. The schematic diagram which shows the outline | summary of the work procedure of a long tip receiving method. The figure which shows the installation method of a guide pipe | tube. The figure which shows the installation method of a long tube. The figure which shows the installation method of a long tube. The figure which shows the injection method of an injection agent. The perspective view which shows the state which isolate | separated one of the unit tubes of the guide tube. Sectional drawing of the guide pipe | tube provided with packing between the division surfaces of the half member of a unit pipe | tube. Sectional drawing which shows the connection part of the edge parts of the unit pipe | tube of a guide pipe | tube. Sectional drawing which shows the structure provided with packing in the coupling | bond part of the edge parts of the unit pipe | tube of a guide pipe. Sectional drawing which shows the coupling | bond part of the half members of a guide tube. The perspective view which shows from the state which disassembled the guide tube to the state assembled. The figure which shows the structure provided with packing in the coupling | bond part of the edge parts of the unit pipe | tube of a guide pipe | tube while providing packing between the division surfaces of the half member of a unit pipe | tube. The perspective view which shows from the state which disassembled the guide tube to the state assembled. 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.

Form 1
As shown in FIGS. 3 to 7, the long tip receiving method according to the first embodiment uses a drilling device 20, a guide tube 11, a long tube 12, a short tube 18, and a push tube 16.

As shown in FIG. 5, the drilling device 20 includes a rock drilling machine 21, a rod 13, a diameter expanding bit (hole drilling blade) 13 a provided at the tip of the rod 13, a rear end of the rod 13, and rock drilling. A coupling 14 that connects the output shaft 21 a of the machine 21, a guide cell 22, a slide centerr 23; 24, a guide cell position varying mechanism 26 that changes the vertical position of the guide cell 22, and the rock drill 21 And a holding member 25 that is provided on the upper surface and holds the long tube 12.
The diameter-expanding bit 13a is a recovery-type bit that expands during excavation and contracts during recovery.
Each of the slide centerers 23; 24 includes elevating means 23m; 24m and gripping portions 23n; 24n for gripping the long tube 12. The guide cell 22 has rails for moving the rock drill 21 and the lifting means 23 m; 24 m back and forth with respect to the face 71. That is, the rock drill 21 and the lifting means 23m; 24m are attached to the guide cell 22 so as to be movable back and forth with respect to the face 71. The lifting / lowering means 23m; 24m has arms 23r; When the guide cell position changing mechanism 26 changes the position of the guide cell 22, the arms 23 r and 24 r of the elevating means 23 m and 24 m expand and contract, and the distance between the gripping portions 23 n and 24 n and the guide cell 22 changes.

As the guide tube 11, a metal cylindrical tube such as a steel tube is used. As shown in FIGS. 1 and 2, the guide tube 11 has a structure in which a plurality of unit tubes 11A having a length corresponding to one excavation length in tunnel excavation are connected. The unit tube 11A is, for example, a cylindrical tube having a length of 1 m, an outer diameter of 139 mm, and an inner diameter of 120 mm. That is, the guide tube 11 is, for example, a tube having a total length of 3 m in which three unit tubes 11A are connected as shown in FIG.
The unit tube 11A is formed by two halved members 11B and 11B having a shape obtained by dividing the unit tube 11A vertically into two along the central axis of the cylinder. The half member 11B as a separating member from which the unit tube 11A is separated is formed in a bowl shape whose cross section perpendicular to the longitudinal direction is a semicircular arc shape. The unit pipe 11A is formed into a cylindrical pipe by abutting the two split members 11B; 11B of the split surfaces 11C; 11C (both end faces in the direction along the circumference of the split member). A hole 11D penetrating the inside and outside of the unit tube 11A is provided in the wall of the unit tube 11A. A check valve 11E is attached to the hole 11D. The check valve 11E has a structure that allows only the flow of fluid from the inside of the unit tube 11A to the outside of the unit tube 11A and prevents the flow of fluid from the outside of the unit tube 11A to the inside of the unit tube 11A.
The guide tube 11 has an outer periphery of the end portions of the two unit tubes 11A so that the end surfaces 11F (end surfaces in the direction along the center axis of the tube) of the unit tubes 11A are abutted and cover the abutting portion 11G. By tightening the surface 11H with a binding band 11J of a metal product as a connection tool, the two unit tubes 11A; 11A are coupled in the longitudinal direction, and the unit tube 11A located at the center of the guide tube 11 is The two half members 11B; 11B to be formed are also joined together. Further, the outer peripheral surface 11H of one end of the unit tube 11A positioned at both ends of the guide tube 11 is tightened by the binding band 11J, so that the half member 11B of the unit tube 11A that forms both ends of the guide tube 11 is formed. The ends are also joined together. As described above, the end portions of the unit tubes 11A in the longitudinal direction are coupled by the binding band 11J, and the half member 11B; 11B of the unit tube 11A that forms the end portion of the guide tube 11 is coupled by the binding band 11J. The guide tube 11 is formed. That is, the guide tube 11 is configured such that a plurality of unit tubes 11A are connected in the longitudinal direction and can be separated from each other, and the unit tube 11A is separated in the radial direction of the unit tube 11A by a dividing surface along the center line G of the unit tube 11A. It is configured to be separable into a plurality. In other words, the guide tube 11 can be divided into a plurality at a predetermined interval along the longitudinal direction of the tube, and a plurality of unit tubes 11A divided in the longitudinal direction of the tube can be divided at a predetermined interval along the radial direction of the tube. It has a configuration that can be divided.
The guide tube 11 can easily separate the unit tubes 11A from each other because the ends of the unit tubes 11A are connected to each other by the binding band 11J.

As the long pipe 12, a metal cylindrical pipe such as a steel pipe of about 9 m is used. A hole penetrating the inside and outside of the long tube 12 is provided in the wall of the long tube 12, and a check valve 12h (see FIG. 7) is attached to the hole. The check valve 12h allows only the flow of fluid from the inside of the long tube 12 to the outside of the long tube 12, and blocks the flow of fluid from the outside of the long tube 12 to the inside of the long tube 12. Structure.
Since the short pipe 18 is for installing the guide pipe 11 in the natural ground 50, for example, a metal cylindrical pipe such as a steel pipe having a length of about 3 m which is shorter than the long pipe 12 and longer than the guide pipe 11. Is used.
Since the push tube 16 pushes the rear end of the long tube 12 to a predetermined position in the guide tube 11, for example, a metal cylindrical tube such as a steel tube shorter than the guide tube 11 and having a length of about 3 m is used. Used.

  In the long tip receiving method according to the present embodiment 1, first, as shown in FIG. 3A, the tunnel excavation direction starts from the face 71 near the boundary between the face 71 of the tunnel cavity 70 and the inner wall surface 72 of the tunnel cavity 70. The guide tube 11 is installed so as to extend obliquely upward and forward toward F. The guide tube 11 is installed in the natural ground 50 with an elevation angle α. The elevation angle α is about 10 ° to 15 °.

  The guide tube 11 is a metal cylindrical tube such as a steel tube. However, since the plurality of unit tubes 11A are connected in the longitudinal direction and are separably connected to each other, the guide tube 11 is formed by the rock drill 21. If the guide tube 11 is driven into the natural ground 50 by directly striking it, there is a possibility that it will break at the joint between the end portions of the unit tube 11A. Therefore, when the guide tube 11 is installed in the natural ground 50, the guide tube 11 is covered so as to cover the outer peripheral surface of the short tube 18 for maintaining the shape of the guide tube 11, and the short tube 18, the guide tube 11, Is installed in the natural ground 50 together. The short pipe 18 has an outer diameter smaller than the inner diameter of the guide pipe 11 and an inner diameter larger than the diameter of the expanded bit 13a when the diameter is reduced.

For example, as shown in FIG. 4A, the short tube 18 is passed through the tube of the guide tube 11 so that the outer periphery of the short tube 18 is covered with the guide tube 11, and the rod 13 is connected to the short diameter tube 13a side. A pressing member 15 for pressing the rear end portion 18e of the short tube 18 and the rear end portion 11K of the guide tube 11, and the rear end portion of the rod 13; The coupling 14 is provided. The base end portion 13 b of the rod 13 and the output shaft 21 a of the rock drill 21 are connected by the coupling 14. In this state, the rock drill 21 is driven, and the rock drill 21 is slid forward along the guide cell 22 while the rod 13 is moved back and forth and rotated. As a result, the ground mountain 50 in front of the face is cut by striking and rotating with the diameter expanding bit 13a, and the pressing body 15 that moves together with the rod 13 pushes the short pipe 18 and the guide pipe 11, so that the short pipe 18 and the guide The pipe 11 is installed in the natural ground 50 together. The rear end portion 11K of the guide tube 11 is projected from the face 71 into the tunnel cavity 70.
After installing the guide pipe 11 in the natural ground 50, the diameter of the enlarged diameter bit 13a is reduced, the rock drill 21 is slid rearward, and the rod 13 and the enlarged diameter bit 13a are pulled out from the inside of the short pipe 18. Then, the pressing body 15 is removed from the rod 13, and the rod 13 and the diameter expanding bit 13a are recovered. Then, the short tube 18 is pulled out from the guide tube 11 and collected.

  Thus, the guide tube 11 is installed on the natural ground 50. In addition, after the guide tube 11 is installed, in order to prevent the guide tube 11 from being pulled out from the natural ground 50, concrete is applied to the face located around the end 11K of the guide tube 11 protruding from the face 71 to the tunnel cavity 70. Is sprayed at the mouth of the guide tube 11 (see FIG. 3A; FIG. 4B).

  Next, as shown in FIG. 4 (b), the rod 13 is inserted into the long tube 12 from the diameter expanding bit 13 a side so as to penetrate the long tube 12. A pressing body 15A and a coupling 14 for pressing the rear end portion of the long tube 18 are provided. Then, the rod 13 is inserted into the guide tube 11. Thereby, the long tube 12 pushed by the pressing body 15A is also inserted into the guide tube 11 as shown in FIG. Specifically, as shown in FIGS. 4 (b) and 4 (c), the slide centerers 23 and 24 are movably attached along the guide cell 22, and the holding member 25 is also provided on the upper surface of the rock drill 21. After the long pipe 12 is supported on the upper portion of the rock drill 21 by the slide centerers 23 and 24 and the holding member 25, the rear slide centerr 24 is slid forward (face 71 side). The long tube 12 is inserted into the guide tube 11.

After inserting the long pipe 12 into the guide pipe 11, as shown in FIG. 5 (a), the rock drill 21 is slid toward the face 71 and moved to the vicinity of the coupling 14, and then the guide cell. The guide cell 22 is raised by the position variable mechanism 26 and the lifting means 23m and 24m are operated to reduce the distance between the gripping portions 23n and 24n of the slide centerers 23 and 24 and the guide cell 22, and the rock drill 21 After matching the height of the center and the center of the long pipe 12, that is, the height of the output shaft 21a of the rock drill 21 and the connecting portion of the coupling 14, the position of the rock drill 21 is adjusted, 21 is connected to the output shaft 21a and the coupling 14 (see FIG. 5B).
During the above operation, the speed at which the distance between the gripping portions 23n, 24n and the guide cell 22 is reduced is synchronized with the rising speed of the guide cell 22 so that no excessive force is applied to the long tube 12. There is a need. Thereby, the long pipe 12 and the rock drill 21 can be reliably connected while maintaining the insertion angle of the long pipe 12.

  Thereafter, as shown in FIG. 5 (b), the rock drill 21 is slid forward while the rock drill 21 is driven, so that the diameter expanding bit 13a drills the natural ground 50 in front of the face and presses it. Since the body 15A pushes the long tube 12, the long tube 12 is pushed into the natural ground 50 (see FIG. 3B; FIG. 3C).

In a state where the long tube 12 is pushed by the pressing body 15A and pushed into the natural ground 50, the long tube 12 is inserted into the natural mountain 50 in front of the face 71, but the rear end 3m The degree (about the length of the guide tube 11) is in the guide tube 11. Therefore, as shown in FIG. 6A, the rear end 13f of the rod 13 and the tip 13t of the additional rod 13D are connected by a connector 17, and the push tube 16 is inserted from the rear end of the additional rod 13D. That is, the additional tube 13 is inserted into the tube of the push tube 16 and the push tube 16 is positioned around the rod 13D so that the distal end 16t of the push tube 16 and the rear end 12e of the long tube 12 are detachable. The push tube 16 and the extension rod 13 </ b> D are connected by the connection tool 19. For example, a fitting structure is employed as a connection form in which the tip end 16t of the push tube 16 and the rear end 12e of the long tube 12 are detachably connected. Then, after connecting the rear end 16e of the extension rod 13D and the output shaft 21a of the rock drill 21 by the coupling 14, as shown in FIG. 6B, the rock drill 21 is slid forward while being driven. . As a result, the expanded bit 13a drills the natural ground 50 in front of the face and the push tube 16 presses the long pipe 12, so that the long pipe 12 is further inserted into the natural ground 50 in front of the face. . At this time, the long tube 12 is pushed in until the rear end 12e of the long tube 12 reaches a predetermined position in the guide tube 11 (see FIG. 3D; FIG. 3E). In this example, in order to effectively use the entire length of the long tube 12, the long tube 12 is pushed in until the rear end 12e of the long tube 12 comes close to the tip 11T of the guide tube 11.
The push tube 16 has the same diameter as the long tube 12. The tip 16t of the push tube 16 and the rear end 12e of the long tube 12 are connected by a fitting structure, for example, so that the inner peripheral surface of the push tube 16 and the inner peripheral surface of the long tube 12 have the same diameter and the same axis. Thus, a circular tube surface is formed in which the inner peripheral surface of the push tube 16 and the inner peripheral surface of the long tube 12 are connected without a gap, and a double packer 30 (to be described later) is smoothly provided in the tube formed on the circular tube surface. Can be inserted into. Further, by pulling out the push tube 16, the fitting between the distal end 16 t of the push tube 16 and the rear end 12 e of the long tube 12 is easily released, so that the collecting operation of the push tube 16 is facilitated.
In addition, since the push tube 16 and the long tube 12 are connected and the push tube 16 and the extension rod 13D are connected, the long tube 12 can be prevented from being shaken during excavation. It will be able to be pushed into the natural ground 50 smoothly.

After pushing the long pipe 12 with the push pipe 16, the rock drill 21 is slid rearward, and the rod 13D, the rod 13, the diameter expansion bit 13a, etc. are removed.
Then, an injecting agent such as a ground solidifying agent such as cement milk or water glass is injected into the long tube 12 and the guide tube 11.
FIGS. 7A to 7C are diagrams showing details of the injection injection method of this example. First, as shown in FIG. 7A, a double packer 30 for injection is installed at the boundary between the long tube 12 and the push tube 16 via the push tube 16, and an injection is injected into the boundary. Thus, by filling the gap between the long tube 12 and the guide tube 11 with an injection agent, a process for preventing the intrusion of earth and sand passing between the long tube 12 and the guide tube 11 is performed. Thereafter, as shown in FIG. 7 (b), the double packer 30 is moved into the long tube 12, and the check valve 12h provided on the wall surface of the long tube 12 from the inside of the long tube 12 with the injection agent. The natural ground 50 is reinforced by infiltrating and injecting it into the natural ground 50 around the long pipe 12. Then, after the connection between the push tube 16 and the long tube 12 is released and the push tube 16 is extracted from the guide tube 11, the double packer 30 is installed in the guide tube 11, and the injection agent is supplied to the guide tube 11. The ground 50 is reinforced by injecting into the ground 50 around the guide tube 11 from the inside via the check valve 11E.
Thereafter, the double packer 30 is recovered, and as shown in FIG. 7C, an injecting agent is injected into the long tube 12 and the guide tube 11 using a vinyl chloride tube 87 for filling the steel tube.

After the tunnel excavation is performed forward to the extent that the whole or a part of the unit pipe 11A located on the tunnel cavity 70 side of the guide pipe 11 is exposed in the tunnel cavity 70, it is located on the tunnel cavity 70 side. The unit tube 11A is pulled out and separated, or a unit moment is applied to the unit tube 11A located on the tunnel cavity 70 side so that the unit tube 11A located on the tunnel cavity 70 side is located at the abutting portion 11G of the guide tube 11. Fold and separate. After separating the unit tube 11A from the guide tube 11, as shown in FIG. 8, the unit tube 11A is separated into two halved members 11B; 11B and collected. In FIG. 8, 34 is an injection as a content filled in the unit tube 11A. Further, after tunnel excavation, the next unit pipe 11A exposed in the tunnel cavity 70 is separated into two halved members 11B; 11B and collected. Then, a new guide tube 11 can be reconfigured by reusing and combining the collected unit tubes 11A. That is, since the guide tube 11 that can be used by reusing the unit tube 11A can be reconfigured, an economical prior construction method can be realized.
After separating the unit tube 11A, the binding band 11J may be removed and separated into two half members 11B; 11B. Alternatively, the binding band 11J may be removed and separated into two half members 11B; 11B. Good.

According to the first aspect, since the guide tube 11 in which the plurality of unit tubes 11A are connected in the longitudinal direction and can be separated from each other is used, the unit tube 11A can be easily separated in the longitudinal direction of the guide tube 11, and the separated unit The usable guide tube 11 can be reconfigured by reusing the tube 11A. That is, an economical long tip receiving method that can reuse (reuse) the guide tube 11 can be provided.
Since the unit tube 11A is configured to be separable into a plurality of radial directions of the unit tube 11A by the dividing surface 11C; 11C along the center line G of the unit tube 11A, the unit tube 11A can be easily separated in the radial direction. Since it becomes easy to take out the infusate which is the content in 11A, it can be set as the unit pipe | tube 11A which can be reused easily.
Since the end portions of the unit pipe 11A are connected by the binding band 11J, the unit pipes 11A can be easily separated from each other, and the recovery operation can be facilitated.
Further, since the long tube 12 is pushed in using the push tube 16 until the rear end 12a of the long tube 12 comes close to the tip 11T of the guide tube 11, the entire length of the long tube 12 is effectively utilized. become able to.

Form 2
A unit tube 11A is interposed between two halved members 11B; 11B as a plurality of separating members separated into a plurality in the radial direction and two divided members 11B; 11B facing each other, between the divided surfaces 11C; 11C. It is good also as a structure formed with the packing.
That is, as shown in FIG. 9, if the packing 33 is interposed between the split surface 11C and the split surface 11C of the pair of half members 11B forming the unit tube 11A, the pair of half members 11B Since the sealing performance between the divided surface 11C and the divided surface 11C is increased, it is possible to prevent the injection agent from leaking between the divided surface 11C and the divided surface 11C of the half member 11B.

Form 3
The shape of the end face of the tube of the unit tube 11A is formed in a concavo-convex shape as shown in FIG. 10, and the end surface 11F of the tube of the unit tube 11A; Since it becomes easy to align the end surfaces 11F; 11F of the unit pipe 11A, the assembly work of the guide pipe 11 can be facilitated.

Form 4
As shown in FIG. 11, the shape of the end face of the unit tube 11 </ b> A is such that a packing 34 is interposed between a surface 32 a and a surface 32 b facing each other in the radial direction of the unit tube 11 </ b> A in the coupling portion 32. For example, since the sealing performance between the end portions of the unit tubes 11A connected in the longitudinal direction is enhanced, the injection agent is prevented from leaking from between the end portions of the unit tubes 11A of the guide tube 11. it can.

Form 5
The split surface 11C of the half member 11B; 11B is formed in an uneven shape as shown in FIG. 12, and the split surfaces 11C; 11C of the pair of half members 11B; 11B forming the unit tube 11A are uneven. If the coupling portion 31 to be abutted together is configured, the split surfaces of the pair of half members 11B; 11B can be easily positioned, so that the work of creating the guide tube 11 can be facilitated. Moreover, since the coupling area between the split surfaces of the pair of half members 11B; 11B increases, the fluid flows through the gap between the split surface 11C and the split surface 11C of the pair of half members 11B; 11B. Leakage from the inside of 11A to the outside of unit tube 11A can be reduced. Also, as shown in FIG. 12, if the pair of halved members 11B; 11B provided with the coupling portions 31 by the unevenness are formed in the same shape, the manufacturing cost of the halved member 11B can be reduced, and the unit tube 11A Assembling becomes easy.

Form 6
As shown in FIG. 13, it is good also as the guide pipe | tube 11 provided with the structure of the connection part 31; 32 of the form 3; 5.

Form 7
In the sixth embodiment, as shown in FIGS. 14A and 14B, the packing member 33 is interposed between the split surface 11C and the split surface 11C between the split members 11B; 32, the packing 34 is interposed between the surfaces 32a and 32b facing each other in the radial direction of the unit tube 11A, so that the fluid from the inside of the guide tube 11 passing through the coupling portion 31; Leakage can be reduced, which is preferable.

Form 8
Not only the end portions in the longitudinal direction of the unit tube 11A are coupled with the binding band 11J, but also the halved member 11B; 11B is bonded to the binding band 11J at a portion other than the end portion of the unit tube 11A as shown in FIG. By joining together, the strength of the guide tube 11 can be reinforced.

The length and diameter of the long tube 12 are appropriately set according to the size of the tunnel, the stroke length of the drilling device 20 to be used, and the like.
In the above example, the slide centerers 23 and 24 are attached to the guide cell 22 of the drilling device 20 when the long tube 12 is inserted and installed. However, two types of drilling devices are prepared and the guide tube 11 is prepared. If an off-the-shelf drilling device is used for driving and the long tube 12 is inserted and driven using a drilling device on which the slide centerers 23 and 24 are mounted in advance, the working efficiency is further improved. be able to.

  As the unit tube 11A, a unit tube that is not separable in the radial direction may be used.

  The guide tube 11 may be a resin tube such as a vinyl chloride tube. Further, the shape of the end face of the tube of the unit tube 11A and the shape of the split surface 11C of the half member 11B may be shapes other than those described above. A connector other than the metal binding band 11J may also be used.

  The shaft portion 13x (see FIG. 4B) of the diameter expanding bit 13a is engaged with the inner wall on the distal end side of the long tube 12, and the long tube 12 is pulled as the diameter expanding bit 13a advances. It may be configured.

  As the bit, in addition to the recoverable diameter expanding bit 13a, a bit called a lost bit left in the natural ground 50 after excavation may be used.

11 guide tube, 12 long tube, 50 ground, 70 tunnel cavity, 71 face,
72 inner wall surface, 11A unit tube, 11B half member (separation member), 11C division surface.

Claims (5)

  After installing the guide pipe diagonally upward and forward from the face near the boundary between the face of the tunnel cavity and the inner wall surface of the tunnel cavity, the long pipe with a smaller diameter than the guide pipe passes through the guide pipe. In the long tip receiving method to reinforce the natural ground by installing it in the natural ground, a long length characterized by using a guide tube in which a plurality of unit tubes are connected in the longitudinal direction and can be separated from each other. Prior construction method.   2. The long tip receiving method according to claim 1, wherein the guide pipe is configured such that the unit pipe is separable into a plurality of radial directions of the unit pipe by a dividing surface along the center line of the unit pipe.   The long tip receiving method according to claim 1 or 2, wherein at least one unit pipe is separated and removed from the guide pipe installed in the natural ground along with tunnel excavation.   The at least one unit pipe is separated and recovered from the guide pipe installed in the natural ground during tunnel excavation, and the unit pipe is reused as a component constituting a new guide pipe. Item 5. The long tip receiving method according to Item 1.   A component that separates and collects at least one unit pipe from a guide pipe installed in a natural ground during tunnel excavation and separates the unit pipe and uses the separated separation member as a new guide pipe The long tip receiving method according to claim 2, wherein the long tip receiving method is used.

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