Injection jig and ground reinforcement method with use of the jig

Abstract

To provide an injection jig and a ground reinforcement method, which enable connecting the tips of injection hoses to injection tubes without relying on manpower.SOLUTION: An injection jig 1A, 1B is used in a construction method to reinforce a ground by penetrating ground-improvement material into cracks in the surrounding natural ground, comprising: check valves 5 that are provided at the tip of multiple injection tubes 4 and secured with sockets 7; and a connection unit 11A, 11B that connects injection pipes 15 provided for supplying the ground-improvement material with the check valves 5 secured with the sockets 7.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to preliminary reinforcement of natural ground during tunnel excavation. [Background technology]

[0002] When excavating a tunnel, a method known as long steel pipe forepiling is known in which long steel pipes are cast into the ground ahead of the tunnel and ground improvement material is injected into the long steel pipes to improve the ground (see Patent Document 1, etc.). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-075292 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, multiple injection tubes are inserted into the steel pipe during injection, and the ground improvement material is injected from each tube. The ground improvement material injected into the steel pipe penetrates into voids and cracks in the ground through discharge holes on the outer periphery of the steel pipe, reinforcing the ground. A check valve is connected to the end of this tube, which is connected to the tip of an injection hose extending from an injection machine for the ground improvement material. The check valve is exposed at the end of the steel pipe, and the connection between the check valve and the tip of the injection hose had to be done manually. Furthermore, since this connection required workers to get very close to the face, there was a risk of damage from falling rocks due to a collapse or landslide of the ground.

[0005] The present invention has been made to solve the above problems, and aims to provide an injection jig and a ground reinforcement method that enable the connection of the tip of the injection tube and the injection hose without relying on human power. [Means for solving the problem]

[0006] The present invention is as follows. 1. An injection jig used in a construction method for reinforcing the ground, which comprises driving a plurality of long steel pipes into unexcavated ground in a tunnel, inserting a plurality of injection tubes into the long steel pipes, injecting ground improvement material into the plurality of injection tubes, and allowing the ground improvement material to penetrate into cracks in the surrounding ground from discharge holes provided on the outer periphery of the long steel pipes, The check valves provided at the ends of the plurality of injection tubes are fixed with sockets; An injection jig comprising a connection unit for connecting an injection pipe for supplying the ground improvement material to the check valve fixed to the socket. 2. The injection pipe is connected to an injection hose extending from an injection machine that supplies the ground improvement material; The injection jig described in 1 above, wherein the connection unit includes a hydraulically or pneumatically operated cylinder connected to the injection tube for moving the injection tube back and forth. 3. The injection jig described in 1 above, wherein the connection unit includes a fixing block for fixing the socket. 4. The connection unit includes a fixing box for fixing the socket; The injection jig according to item 1 above, characterized in that the fixed box is opened and closed by a cylinder operated by hydraulic pressure or air pressure. 5. A construction method for reinforcing the ground by driving multiple long steel pipes into unexcavated ground in a tunnel, inserting multiple injection tubes into the long steel pipes, injecting ground improvement material into the multiple injection tubes, and allowing the ground improvement material to penetrate into cracks in the surrounding ground from discharge holes provided on the outer periphery of the long steel pipes, A ground reinforcement method characterized by fixing check valves provided at the ends of the multiple injection tubes with sockets, fixing the sockets with fixing parts provided on a connection unit, moving the injection pipes provided on the connection unit forward using a drive part installed on the connection unit to connect them to the check valves fixed to the sockets, and injecting the ground improvement material into the multiple injection tubes. [Effects of the Invention]

[0007] According to the present invention, the tip of the injection tube and the injection hose can be connected and disconnected without relying on human power, so there is no need for workers to get very close to the face, improving the safety of the injection work. In addition, since there is no need for workers to connect and disconnect the tip of the injection tube and the injection hose, labor savings are achieved in the injection work. [Brief explanation of the drawings]

[0008] The present invention will be further described in the following detailed description, which provides non-limiting examples of exemplary embodiments according to the present invention, and with reference to the several figures mentioned, in which like reference numerals refer to like elements throughout the several views of the drawings. [Figure 1] 1A and 1B are explanatory diagrams of a socket according to embodiment 1, in which (a) shows a cross-sectional view of a steel pipe into which multiple injection tubes have been inserted, (b) shows the state before the check valve is fixed in the socket as viewed from the arrow A, and (c) shows the state after the check valve has been fixed in the socket as viewed from the arrow A. [Figure 2] 1A and 1B are explanatory views of an injection jig (connection unit) according to the first embodiment, in which (a) is a side view and (b) is a plan view. [Figure 3] 1A and 1B are explanatory diagrams of a fixing box that constitutes a connection unit, in which FIG. 1A shows an open state before a socket is fixed, and FIG. 1B shows a closed state after the socket is fixed. [Figure 4] 1 is an explanatory diagram of the natural ground reinforcement method according to the first embodiment, showing a state in which an injection tube is inserted into a steel pipe. [Figure 5] This is an explanatory diagram of the ground reinforcement method, showing the connection unit installed in the basket of a drill jumbo. [Figure 6] FIG. 10 is an explanatory diagram of the ground reinforcement method, showing the state in which the socket and the fixing box of the connection unit are aligned. [Figure 7] An explanatory diagram of the ground reinforcement method, where (a) shows the state before the injection pipe is connected to the socket's check valve, and (b) shows the state after the injection pipe is connected to the socket's check valve. [Figure 8]10A and 10B are explanatory views of an injection jig (connection unit) according to a second embodiment, in which (a) is a side view and (b) is a plan view. [Figure 9] 10 is an explanatory diagram of the natural ground reinforcement method according to the second embodiment, showing the state in which an injection tube is inserted into a steel pipe. [Figure 10] This is an explanatory diagram of the ground reinforcement method, showing the connection unit installed in the basket of a drill jumbo. [Figure 11] FIG. 10 is an explanatory diagram of the natural ground reinforcement method, showing the state in which the socket and the fixing block of the connection unit are aligned. [Figure 12] An explanatory diagram of the ground reinforcement method, where (a) shows the state before the injection pipe is connected to the socket's check valve, and (b) shows the state after the injection pipe is connected to the socket's check valve. [Figure 13] This is an explanatory diagram of the ground reinforcement method, showing the state in which steel pipes have been cast into the ground. [Figure 14] 10A and 10B are explanatory diagrams of a socket according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The matters set forth herein are for illustrative purposes and are intended to provide an illustrative description of the embodiments of the present invention, with the aim of providing what is believed to be the most effective and easily understandable explanation of the principles and conceptual features of the present invention. In this regard, it is not intended to show structural details of the present invention beyond the extent necessary for a fundamental understanding of the present invention, and the description, taken together with the drawings, will make clear to those skilled in the art how some forms of the present invention may be actually embodied.

[0010] Hereinafter, the present invention will be specifically described by way of embodiments with reference to the drawings.

[0011] <Embodiment 1> The injection jig 1A according to this embodiment is used in a construction method in which multiple long steel pipes 3 are cast into unexcavated ground in a tunnel 2, multiple injection tubes 4 are inserted into the long steel pipes 3, and a ground improvement material such as a urethane-, cement-, or water glass-based material is injected into the multiple injection tubes 4, allowing the material to penetrate into cracks in the surrounding ground through discharge holes 3a provided on the periphery of the long steel pipes 3, thereby reinforcing the ground (see FIGS. 1 and 13). Drilling holes in the ground and casting the steel pipes 3 are performed using a drill jumbo (excavation machine) 6. The drill jumbo 6 is equipped with a basket 6a at the tip of a boom 6b on which an operator can ride. The drill jumbo 6 also has an operator's cabin 6c for rotating and extending the boom 6b.

[0012] As shown in Figure 1, the injection tube 4 is exposed from the opening of the steel pipe 3, and a known check valve 5 is connected to the tip. The injection tube 4 is fixed to the end of the steel pipe 3 with a rubber cap 8. The socket 7 groups together multiple check valves 5 and is made of rubber or resin. More specifically, the socket 7 has holding portions 7a that hold each check valve 5, and these holding portions 7a are arranged in a straight line. The holding portions 7a can be, for example, holding holes or holding grooves into which the check valves 5 are press-fitted or inserted.

[0013] As shown in FIG. 2, the injection jig 1A includes a connection unit 11A that connects an injection pipe 15 for supplying ground improvement material to each check valve 5 fixed to the socket 7.

[0014] The connection unit 11A is equipped with a hydraulically or pneumatically operated cylinder 13 (drive unit 13) that is connected to an injection pipe 15 and moves the injection pipe 15 back and forth. The injection pipe 15 is connected by a joint 18 to an injection hose 17 extending from a known injection machine 16 that supplies ground improvement material. Each cylinder 13 is attached to a metal or resin base 14. Each cylinder 13 is operated by a fluid supply from a fluid supply unit (not shown) such as a compressor or pump that is pre-installed in the drill jumbo 6. However, the cylinders 13 may also be operated by a fluid supply from a dedicated fluid supply unit installed separately from the drill jumbo 6.

[0015] In this embodiment, an example is shown in which each of the multiple injection tubes 15 is moved by a corresponding cylinder 13, but, for example, multiple injection tubes 15 may be moved by one cylinder 13. Furthermore, injection tubes 15 may be moved by driving a motor (drive unit) instead of by cylinder 13.

[0016] The connection unit 11A includes a fixing block 12A (fixing portion 12A) that fixes the socket 7. The fixing box 12A is structured to open and close using a cylinder (driving portion) 20 that is hydraulically or pneumatically operated (see Figure 3). More specifically, the fixing box 12A has left and right gripping portions 21 that are connected to the cylinders 20, and the gripping portions 21 open and close when the cylinders 20 are actuated. The injection tube 4 and the socket 7 are positioned within the fixing box 12A, and the cylinders 20 are actuated to close the fixing box 12A, thereby fixing the socket 7.

[0017] In this embodiment, the gripping portions 21 are opened and closed on both sides of the socket 7 in the longitudinal direction to fix and release the socket 7, but the gripping portions 21 may be opened and closed on both sides of the socket 7 in the transverse direction to fix and release the socket 7. Furthermore, the fixing box 12A may be opened and closed by driving a motor (drive unit) instead of the cylinder 20.

[0018] Connection unit 11A is equipped with a guide box 19 that guides the movement of injection tube 15 in the forward and backward directions (see FIG. 2). Guide box 19 is installed on base 14 and has guide portion 19a through which injection tube 15 passes, allowing injection tube 15 to move linearly. Guide portion 19a can be, for example, a guide hole or a guide groove.

[0019] The base 14 is formed in a plate or frame shape, and is supported on the boom 6b or basket 6a of the drill jumbo 6 (see Figures 5 and 6). The base 14 has a first base 14a and a second base 14b connected via a hinge 23, and a connection unit 11A is provided on the first base 14a, allowing the angle of the first base 14a (i.e., connection unit 11A) to be changed relative to the second base 14b.

[0020] A ground reinforcement method using the injection jig 1A configured as described above will be described below. A steel pipe 3 is driven into the ground using a jumbo drill 6 by a known method (see Figure 13). Next, an injection tube 4 is inserted into the steel pipe 3 (see Figure 4). The check valves 5 at the ends of multiple injection tubes 4 are gathered and fixed by sockets 7. The sockets 7 can be installed after the injection tubes 4 are inserted, or installed on the injection tubes 4 in advance, but installing them on the injection tubes 4 in advance is preferable.

[0021] Next, the connection unit 11A is installed on the boom 6b or basket 6a of the drill jumbo 6 (see FIG. 5). After that, an operator operates the boom 6b or basket 6a inside the cabin 6c to align the positions of the socket 7 and the fixing box 12A (see FIG. 6). For this alignment, a direction control method installed in the drill jumbo 6 or a known direction control method using a laser can be used.

[0022] More specifically, the boom 6b or basket 6a is operated to position the connection unit 11A behind the injection tube 4 exposed at the opening of the steel pipe 3 (see FIG. 5), and then the connection unit 11A is tilted to place the socket 7 on the fixing box 12, thereby aligning the socket 7 with the fixing box 12A (see FIG. 6). The connection unit 11A can be tilted, for example, by operating a pneumatic or hydraulic cylinder 26 provided between the bases 14a and 14b. However, the socket 7 and the fixing box 12A may also be aligned without tilting the connection unit 11A.

[0023] Thereafter, cylinder 20 of fixing box 12A of connection unit 11A is activated to fix socket 7 (see Figure 7). Next, cylinder 13 of connection unit 11A is activated to move injection pipe 15 forward and connect it to check valve 5 inside socket 7. Next, injection machine 16 is activated to inject ground improvement material into injection tube 4 through injection hose 17 and injection pipe 15. Then, when a predetermined end condition is reached, injection is terminated and cylinder 13 of connection unit 11A is operated to move injection pipe 15 inside connection unit 11A backward.

[0024] As described above, the injection jig 1A of this embodiment includes a connection unit 11A that connects the injection pipe 15 that supplies ground improvement material to the check valve 5 fixed to the socket 7, and the connection unit 11A includes a fixing portion 12A that fixes the socket 7 and a drive portion 13 that moves the injection pipe 15 in the forward and backward directions. As a result, the check valves 5 provided at the ends of the multiple injection tubes 4 are fixed to the socket 7, the socket 7 is fixed by the fixing portion 12A provided on the connection unit 11A, and the injection pipe 15 provided on the connection unit 11A is moved forward by the drive portion 13 installed on the connection unit 11A to connect to the check valve 5 fixed to the socket 7, thereby injecting the ground improvement material into the multiple injection tubes 4. In this way, the tip of the injection tube 4 and the injection hose 17 can be connected and disconnected without relying on human power, eliminating the need for workers to get very close to the face, improving the safety of the injection work. Furthermore, since no worker is required to connect or disconnect the tip of injection tube 4 and injection hose 17, labor savings are achieved in the injection work.

[0025] In this embodiment, the connection unit 11A also includes an injection pipe 15 that connects to an injection hose 17 extending from an injection machine 16 that supplies ground improvement material, and a cylinder 13 that is connected to the injection pipe 15 and acts as a fixed part that is hydraulically or pneumatically operated to move the injection pipe 15 back and forth. This makes it easy to connect and disconnect the check valve 5 of the socket 7 and the injection pipe 15.

[0026] Furthermore, in this embodiment, the connection unit 11A includes a fixing box 12A that fixes the socket 7, and the fixing box 12A is structured to be opened and closed by a hydraulically or pneumatically operated cylinder 20. This makes it easy to fix and release the socket 7.

[0027] <Embodiment 2> Next, a description will be given of a casting jig 1B according to a second embodiment. Components that are substantially the same as those in casting jig 1A above will be given the same reference numerals and detailed description will be omitted, and only differences between the two will be described in detail.

[0028] 8, the injection jig 1B according to this embodiment includes a connection unit 11B that connects an injection pipe 15 for supplying ground improvement material to each check valve 5 fixed to the socket 7. The connection unit 11B includes a cylinder 13 (drive unit 13) and a guide box 19.

[0029] The connection unit 11B includes a fixing block 12B (fixing portion 12B) that fixes the socket 7. A plurality of fixing blocks 12B are erected on a base 14 and arranged in a straight line. The injection tube 4 is positioned between the fixing blocks 12B, and the socket 7 is fixed by abutting against each fixing block 12B (see FIG. 12).

[0030] A ground reinforcement method using the injection jig 1B configured as described above will be described below. A steel pipe 3 is driven into the ground using a jumbo drill 6 in a known manner (see Figure 13). Next, an injection tube 4 is inserted into the steel pipe 3 (see Figure 9). The check valves 5 at the ends of multiple injection tubes 4 are gathered and fixed by sockets 7. The sockets 7 can be installed after the injection tubes 4 are inserted, or installed on the injection tubes 4 in advance, but installing them on the injection tubes 4 in advance is preferable.

[0031] Next, the connection unit 11B is installed on the boom 6b or basket 6a of the drill jumbo 6 (see FIG. 10). After that, an operator operates the boom 6b or basket 6a inside the cabin 6c to align the positions of the socket 7 and the fixed block 12B (see FIG. 11). For this alignment, a direction control method installed in the drill jumbo 6 or a known direction control method using a laser can be used.

[0032] More specifically, the boom 6b or basket 6a is operated to position the connection unit 11B behind the injection tube 4 exposed at the opening of the steel pipe 3 (see FIG. 10), and then the connection unit 11B is tilted to align the socket 7 with the fixed block 12B (see FIG. 11). The connection unit 11B can be tilted, for example, by operating a pneumatic or hydraulic cylinder 26 provided between the bases 14a and 14b. However, the socket 7 and the fixed block 12B may also be aligned without tilting the connection unit 11B.

[0033] After the above alignment, the socket 7 is fixed with the fixing block 12B of the connection unit 11B (see Figure 12). Next, the cylinder 13 of the connection unit 11B is operated to move the injection pipe 15 forward and connect it to the check valve 5 inside the socket 7. Next, the injection machine 16 is operated to inject the ground improvement material into the injection tube 4 through the injection hose 17 and injection pipe 15. Then, when a predetermined end condition is reached, the injection is stopped and the cylinder 13 of the connection unit 11B is operated to move the injection pipe 15 inside the connection unit 11B backward.

[0034] As described above, according to the injection jig 1B of this embodiment, in addition to achieving substantially the same effects as the above-mentioned injection jig 1A, the connection unit 11B is provided with a fixing block 12B that fixes the socket 7, so that a simple and inexpensive connection unit 11B can be provided that does not require a drive unit for fixing the socket 7.

[0035] The present invention is not limited to the above-described embodiment, and various modifications within the scope of the present invention are possible depending on the purpose and application. For example, in the above-described embodiment, as shown in Fig. 14, the socket 7 may be provided with an identification portion 28 (shown as a triangle, square, or circle in the figure) that indicates the appropriate correspondence between each holding portion 7a of the socket 7 and each filling tube 4 of different lengths and colors. The identification portion 28 may be, for example, one or a combination of two or more of colors, patterns, symbols, letters, etc.

[0036] The present invention is not limited to the above-described embodiments, and various modifications and variations are possible within the scope of the claims of the present invention. [Industrial Applicability]

[0037] The present invention is widely used as a technique for connecting the tip of an injection tube and an injection hose for advance reinforcement of the ground during tunnel excavation. [Explanation of symbols]

[0038] 1A, 1B; Injection jig 2; Tunnel 3; Long steel pipe 4; Injection tube 5; check valve 7; socket 11A, 11B: Connection unit 12A: Fixing box (fixing part) 12B: Fixed block (fixed part) 13: Cylinder (drive part) 15; Injection pipe 20; Cylinder (drive part).

Claims

1. An injection jig used in a construction method for reinforcing the ground, which comprises driving a plurality of long steel pipes into unexcavated ground in a tunnel, inserting a plurality of injection tubes into the long steel pipes, injecting ground improvement material into the plurality of injection tubes, and allowing the ground improvement material to penetrate into cracks in the surrounding ground from discharge holes provided on the outer periphery of the long steel pipes, The check valves provided at the ends of the plurality of injection tubes are fixed with sockets; An injection jig comprising a connection unit for connecting an injection pipe for supplying the ground improvement material to the check valve fixed to the socket.

2. The injection pipe is connected to an injection hose extending from an injection machine that supplies the ground improvement material, 2. The injection jig according to claim 1, wherein the connection unit comprises a hydraulically or pneumatically operated cylinder connected to the injection tube for moving the injection tube back and forth.

3. The injection jig according to claim 1 , wherein the connection unit includes a fixing block for fixing the socket.

4. the connection unit includes a fixing box for fixing the socket; 2. The injection jig according to claim 1, wherein the fixed box is opened and closed by a hydraulically or pneumatically operated cylinder.

5. A construction method for reinforcing the ground by driving a plurality of long steel pipes into unexcavated ground in a tunnel, inserting a plurality of injection tubes into the long steel pipes, injecting ground improvement material into the plurality of injection tubes, and allowing the ground improvement material to penetrate into cracks in the surrounding ground from discharge holes provided on the outer periphery of the long steel pipes, A ground reinforcement method characterized by fixing check valves provided at the ends of the multiple injection tubes with sockets, fixing the sockets with fixing parts provided on a connection unit, moving the injection pipes provided on the connection unit forward using a drive part installed on the connection unit to connect them to the check valves fixed to the sockets, and injecting the ground improvement material into the multiple injection tubes.

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