Injection device and tunnel structure

Abstract

To provide an injection tool capable of suppressing formation of a gap between itself and a surface of a tunnel structure, and the tunnel structure.SOLUTION: An injection tool 20 of the present invention comprises: an injection pipe 21 inserted into a hole part 12 arranged in a tunnel structure 11; and a fixture 22 connected to a base end part of the injection pipe 21 and fixed on a surface of the tunnel structure 11, wherein the fixture 22 comprises a fixing part 221 arranged along the surface of the tunnel structure 11, and a cylindrical part 23 connected to the base end part of the injection pipe 21, and the fixing part 221 is formed using a thermoplastic resin with tensile elastic modulus of 1,000 MPa or more to 5,000 MPa or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an injection device used for filling a cavity or the like inside a tunnel structure with a grout material or the like through a hole provided in the tunnel structure, and a tunnel structure using such an injection device.

Background Art

[0002] Normally, a tunnel has a structure that covers and protects the ground with a lining concrete which is a tunnel structure. However, due to water inflow from the ground or the like, a cavity may occur between the back surface of the lining concrete and the ground. The occurrence of such a cavity causes a bias in the stress applied to the arch structure of the tunnel, reducing the stability of the tunnel structure. Therefore, it is necessary to fill the cavity with a liquid grout material and fill the cavity by the curing of the grout material. An injection device is used for filling the grout material. As such an injection device, there is the grout injection device described in Patent Document 1. The grout injection device includes an injection pipe inserted into a hole provided in a structure, and a mounting jig attached to the base end portion of the injection pipe. The mounting jig has a contact portion that can be arranged along the vicinity portion of the hole, and a fixing means that can be fixed to the surface of the structure is attached to the contact portion. Further, Patent Document 1 describes metals and hard plastics regarding the material of the mounting jig.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the injection device described above, the contact portion of the mounting jig is positioned along the vicinity of the hole provided in the tunnel structure and fixed to the surface of the tunnel structure by fixing means, but in this fixed state, a gap is likely to form between the jig and the surface of the tunnel structure. Furthermore, liquid grout material that has flowed back from the cavity during grout filling, or rainwater that has permeated through the ground, can flow into the hole provided in the tunnel structure. If a gap is formed between the contact portion of the injection device and the surface of the tunnel structure as described above, problems such as leakage of liquid grout material that has flowed into the hole, or leakage of rainwater into the tunnel, occur.

[0005] This invention has been made in view of the above circumstances, and aims to provide an injection device and a tunnel structure that can suppress the formation of gaps between the surface of the tunnel structure and the device. [Means for solving the problem]

[0006] In other words, the present invention is as follows. [1] The injection device of the present invention comprises an injection pipe inserted into a hole provided in a tunnel structure, and a mounting jig connected to the base end of the injection pipe and fixed to the surface of the tunnel structure, The mounting jig comprises a fixing portion positioned along the surface of the tunnel structure and a cylindrical portion connected to the base end of the injection pipe. The key point is that the fixing portion is formed using a thermoplastic resin with a tensile modulus of 1000 MPa or more and 5000 MPa or less. [2] In the injection device of the present invention, the fixing part can be formed in the shape of a plate. [3] In the injection device of the present invention, if the planar area of ​​the fixed part is S1 and the area of ​​the hole in a cross section perpendicular to the axial direction is S2, then S1 and S2 can satisfy the relationship 5 × S2 ≤ S1 ≤ 50 × S2. [4] In the injection device of the present invention, when the height of the cylindrical portion is h and the inner diameter of the hole portion is a, the relationship h > a can be satisfied between h and a. [5] In the injection device of the present invention, the wall thickness of the fixing part may be 3 mm or more and 10 mm or less. [6] In the injection device of the present invention, the fixing portion may be formed in a circular shape in a plan view. [7] The gist of the tunnel structure of the present invention is that the injection device is fixed to the surface of the tunnel structure by anchor bolts via the fixing portion. [8] In the tunnel structure of the present invention, a sealing portion may be interposed between the fixing portion and the tunnel structure. [9] In the tunnel structure of the present invention, the sealing portion may be formed using one or more selected from the group consisting of caulking agent, resin sheet, resin packing, and O-ring. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide an injection device and a tunnel structure that can suppress the formation of gaps between the surface of the tunnel structure and the injection device. [Brief explanation of the drawing]

[0008] [Figure 1] This is a longitudinal cross-sectional view of a tunnel structure according to an embodiment. [Figure 2] (a) is a plan view of the mounting jig according to the embodiment, and (b) is a cross-sectional view along line BB in Figure 2(a). [Figure 3] This is a perspective view of a mounting jig according to an embodiment. [Figure 4] (a) and (b) are cross-sectional views showing examples of modifications to the mounting fixture according to the embodiment. [Figure 5] This is a longitudinal cross-sectional view showing the state of use of the tunnel structure according to the embodiment. [Figure 6] This is a longitudinal cross-sectional view showing the state of use of the tunnel structure according to the embodiment. [Modes for carrying out the invention]

[0009] The present invention will now be described. The matters described herein are illustrative and illustrative to illustrate embodiments of the present invention, and are intended to provide what is considered to be the most effective and readily understandable explanation of the principles and conceptual features of the present invention. In this regard, it is not intended to describe the constituent details of the present invention beyond what is necessary for a fundamental understanding of the invention, and this description will make it clear to those skilled in the art how some forms of the present invention are actually embodied.

[0010] As shown in Figure 1, the injection device 20 according to the embodiment of the present invention is The system comprises an injection pipe 21 inserted into a hole 12 provided in the tunnel structure 11, and a mounting jig 22 connected to the base end of the injection pipe 21 and fixed to the surface of the tunnel structure 11. The mounting jig 22 comprises a fixing portion 221 positioned along the surface of the tunnel structure 11 and a cylindrical portion 23 connected to the base end of the injection pipe 21. The fixing portion 221 is characterized by being formed using a thermoplastic resin with a tensile modulus of 1000 MPa or more and 5000 MPa or less.

[0011] The tunnel structure 11 is not particularly limited as long as it is an artificial structure that supports, lines, etc., the excavated ground 13 in the tunnel, but specifically, lining concrete that constitutes the tunnel wall can be given as an example. In the following text, unless otherwise specified, the tunnel structure 11 is assumed to be lining concrete, "surface" refers to one side on the interior side of the tunnel, and "back" refers to the other side on the natural ground 13 side.

[0012] On the back surface of the tunnel structure 11, cavities 14 may form due to seepage from the ground 13. The tunnel structure 11 is stabilized by the even application of earth pressure from above relative to its arch structure. However, in areas where cavities 14 are formed, the earth pressure from the ground 13 cannot be received, and the earth pressure is concentrated in other areas, causing a change in the applied load. This change in applied load can lead to problems such as a decrease in the durability of the tunnel structure 11 and structural instability. In order to suppress the occurrence of defects in such a tunnel structure 11, grout material is injected and filled into the cavity 14 on the back surface of the tunnel structure 11.

[0013] The hole 12 provided in the tunnel structure 11 can be formed so as to penetrate from the surface to the back surface of the tunnel structure 11 in the thickness direction. The hole 12 formed by penetrating the tunnel structure 11 in the thickness direction in this way communicates with the cavity 14 formed on the back surface of the tunnel structure 11. Therefore, by using the hole 12 that communicates with the cavity 14, it becomes possible to inject and fill the grout material into the cavity 14 through the hole 12.

[0014] The grout material to be injected and filled into the cavity 14 is not particularly limited with respect to its composition or the like as long as it has fluidity that can be injected into the cavity 14. Examples of the grout material include cement-based grout material, slag-based grout material, clay-based grout material, synthetic resin-based grout material, and the like. Among these, synthetic resin-based grout material is excellent in fluidity, easy to use, and preferable. Usually, as the synthetic resin-based grout material, a urethane-based grout material composed of liquid A mainly containing polyol and liquid B mainly containing polyisocyanate can be used.

[0015] The injection device 20 is attached to the tunnel structure 11 and is used for injecting and filling the grout material into the cavity 14 through the hole 12. The injection device 20 includes an injection pipe 21 and a mounting jig 22. The injection pipe 21 is inserted into the hole 12 provided in the tunnel structure 11 and functions to deliver the grout material to the cavity 14. The mounting jig 22 is connected to the injection pipe 21 and fixed to the surface of the tunnel structure 11, and functions to support and fix the injection pipe 21 inserted into the hole 12 with respect to the tunnel structure 11.

[0016] The injection tube 21 is not particularly limited in terms of size, material, configuration, etc., as long as it performs the functions described above. Regarding the size of the injection pipe 21, the length of the injection pipe 21 can be such that it protrudes from the hole 12 on the back surface of the tunnel structure 11 and its tip reaches the cavity 14. The injection pipe 21 can be appropriately selected from different lengths depending on the thickness of the tunnel structure 11, and used in combination with the mounting jig 22.

[0017] Regarding the size of the injection tube 21, the outer diameter of the injection tube 21 can be such that D ≤ a, where D is the outer diameter and a is the inner diameter of the hole 12. Preferably, the relationship between D and a is 0.4 × a ≤ D ≤ 0.95 × a, more preferably 0.5 × a ≤ D ≤ 0.9 × a, and even more preferably 0.6 × a ≤ D ≤ 0.8 × a. If the outer diameter of the injection pipe 21 satisfies the above-described relationship with the inner diameter of the hole 12, the operation of inserting the injection pipe 21 into the hole 12 can be easily performed. The injection pipe 21 can be appropriately selected according to the inner diameter a (mm) of the hole 12 provided in the tunnel structure 11, for example, and can be used in combination with the mounting jig 22.

[0018] Specifically, the inner diameter a (mm) of the hole 12 in the tunnel structure 11 can be 10 mm to 60 mm, preferably 15 mm to 50 mm, and more preferably 20 mm to 40 mm. The outer diameter D (mm) of the injection tube 21 can be 8 mm to 55 mm, preferably 10 mm to 45 mm, and more preferably 15 mm to 35 mm.

[0019] Examples of materials for the injection tube 21 include synthetic resin and metal. Examples of synthetic resins include polyvinyl chloride (PVC), polyolefins such as polypropylene (PP) and polyethylene (PE), polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polycarbonate (PC), polyacetal (POM), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer resin (ABS), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyphenylene oxide (PPO), and polyphenylene ether (PPE). Examples of metals include iron, aluminum, nickel alloys, and stainless steel. The injection tube 21 can be made of one or more of the synthetic resins and metals mentioned above.

[0020] Regarding the configuration of the injection pipe 21, a connecting means can be provided at the base end of the injection pipe 21 for connecting to the cylindrical portion 23 of the mounting jig 22. As a means of connection, for example, a cylindrical male threaded portion 211 with male threads threaded on its outer surface can be cited (see Figure 1). Other connecting means include a cylindrical female threaded portion (not shown) with female threads threaded on its inner surface, a cylindrical insertion portion (not shown) into which the cylindrical portion 23 of the mounting jig 22 is inserted, and a cylindrical insertion portion (not shown) that is fitted into the cylindrical portion 23 of the mounting jig 22. Furthermore, if the injection pipe 21 and the cylindrical portion 23 of the mounting jig 22 are connected by a fitting or insertion relationship, the injection pipe 21 and the cylindrical portion 23 can be joined using, for example, an adhesive.

[0021] As shown in Figures 2(a), (b) and 3, the mounting jig 22 comprises a fixing portion 221 positioned along the surface of the tunnel structure 11 to perform the above-mentioned functions, and a cylindrical portion 23 connected to the base end of the injection pipe 21. The fixing part 221 can be shaped to have an injection port 222 in the center. The cylindrical portion 23 can be provided in a convex shape at a position corresponding to the injection port 222 provided in the fixed portion 221. In the mounting jig 22, the injection port 222 of the fixing part 221 and the inside of the cylindrical part 23 can be configured to communicate with each other.

[0022] The cylindrical portion 23 is not particularly limited in terms of its other configurations, materials, size, etc., as long as it is configured to be connected to the base end of the injection pipe 21. The cylindrical portion 23 may be configured to have connecting means for connecting with the injection pipe 21. As a means of connection, for example, a female screw 231 is threaded on the inner circumferential surface of the cylindrical portion 23 (see Figure 3). Other connecting means include a cylindrical male threaded portion 232 with male threads threaded on its outer surface (see Figure 4(a)), a cylindrical insertion portion 233 that is inserted into an insertion portion provided at the base end of the injection pipe 21 (see Figure 4(b)), and an insertion portion (not shown) into which an insertion portion provided at the base end of the injection pipe 21 is fitted.

[0023] Examples of materials for the cylindrical portion 23 include polyvinyl chloride (PVC), polyolefins such as polypropylene (PP) and polyethylene (PE), polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), thermoplastic resins such as polycarbonate (PC), polyacetal (POM), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer resin (ABS), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyphenylene oxide (PPO), and polyphenylene ether (PPE), as well as metals such as iron, aluminum, nickel alloy, and stainless steel. One or more of these materials can be selected and used.

[0024] If the cylindrical portion 23 is made of the same material as the fixing portion 221, it can be integrated with the fixing portion 221. In this case, the mounting jig 22 can be made simpler and the number of parts can be reduced. Furthermore, if the cylindrical portion 23 is made of the same material as the fixing portion 221, it can be manufactured integrally with the fixing portion 221 by injection molding. Furthermore, if the cylindrical portion 23 is made of a different material than the fixing portion 221, it can be formed separately from the fixing portion 221 and integrated by bonding, screwing, heat welding, integral molding, etc.

[0025] The size of the cylindrical portion 23 can be such that, when the height of the cylindrical portion 23 is h (mm) and the inner diameter of the hole 12 provided in the tunnel structure 11 is a (mm), h and a satisfy the relationship h > a. In this case, the cylindrical portion 23 can be easily inserted into the hole 12. Specifically, the height h (mm) of the cylindrical portion 23 can be 12 mm to 65 mm, preferably 15 mm to 50 mm, and more preferably 20 mm to 40 mm.

[0026] The inner diameter of the cylindrical portion 23 is d2 (mm), and the inner diameter of the injection pipe 21 is d1 (mm). In this case, d1 and d2 can satisfy the relationship d1 ≤ d2. Preferably, the relationship between d1 and d2 is 0.2 × d2 ≤ d1 ≤ d2, and more preferably 0.3 × d2 ≤ d1 ≤ 0.9 × d2. In this case, the grout material can be suitably flowed from the cylindrical portion 23 to the injection pipe 21. Specifically, the inner diameter d1 (mm) of the injection tube 21 can be 3 mm to 50 mm, preferably 5 mm to 40 mm, and more preferably 10 mm to 30 mm. The inner diameter d2 (mm) of the cylindrical portion 23 can be 5 mm to 55 mm, preferably 10 mm to 45 mm, and more preferably 15 mm to 35 mm.

[0027] The fixing portion 221 is positioned along the surface of the tunnel structure 11 and is for fixing the mounting jig 22 to the surface of the tunnel structure 11. The fixing portion 221 is formed using a thermoplastic resin with a tensile modulus of 1000 MPa to 5000 MPa. The surface shape of the tunnel structure 11 is usually curved because the tunnel is formed in an arch shape. The fixing portion 221 is formed using a thermoplastic resin with the above-mentioned tensile modulus, thereby possessing flexibility that allows it to conform to the curved surface of the tunnel structure 11. In other words, the fixing part 221, formed using the thermoplastic resin with the aforementioned tensile modulus, conforms to the shape of the surface of the tunnel structure 11, allowing it to contact the surface without any gaps, thereby suppressing the formation of gaps between it and the surface of the tunnel structure 11.

[0028] Examples of thermoplastic resins having the above-mentioned tensile modulus include polyolefins such as polypropylene (PP) and polyethylene (PE), polyesters such as polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), and acrylonitrile-butadiene-styrene copolymer resin (ABS). The tensile modulus can preferably be 1020 MPa or more and 4000 MPa or less, more preferably 1050 MPa or more and 3000 MPa or less, and even more preferably 1100 MPa or more and 2500 MPa or less.

[0029] The fixing portion 221 is formed using a thermoplastic resin with the above-mentioned tensile modulus and has a configuration that allows it to be fixed to the surface of the tunnel structure 11; however, its shape, size, etc., are not particularly limited. The fixing portion 221 can be configured to have fixing holes 223 for fixing to the tunnel structure 11. The fixing hole 223 can be formed to penetrate the fixing portion 221 in the thickness direction, and can be configured to allow anchor bolts 16 or the like to be inserted through it. Only one or more fixing holes 223 can be provided. If multiple fixing holes 223 are provided, they can be arranged symmetrically with respect to the injection port 222 and at equal intervals from each other.

[0030] Examples of the shape of the fixing part 221 include plate shapes such as flat plates, curved plates, and corrugated plates, or three-dimensional shapes such as hemispheres, domes, frustocones, triangular frustocones, and square frustocones. Among these shapes of the fixing part 221, plate shapes, especially flat plates, are preferred because they can easily conform to the shape of the surface of the tunnel structure 11. Regarding the shape of the fixing portion 221, it is not limited to having a uniform thickness throughout; for example, the central portion can be made thinner to allow for easier flexibility. Furthermore, the fixing portion 221 can have chamfered edges and corners. Of the front and back surfaces of the fixing part 221, the back surface that comes into contact with the tunnel structure 11 can be provided with a groove, for example, into which a sealing part 17 such as an O-ring or a resin packing can be fitted. Of the front and back surfaces of the fixing part 221, the surface facing the inside of the tunnel may be provided with uneven surfaces for anti-slip purposes, or with ribs or flanges for reinforcement purposes.

[0031] The fixing portion 221 can be formed in a circular, triangular, square, rectangular, hexagonal, or other shape in plan view. Among these, the circular shape is useful because, when multiple fixing holes 223 are provided, they can be easily arranged symmetrically and at equal intervals from one another. If the planar area of ​​the fixing portion 221 is S1 and the area of ​​the hole 12 in the tunnel structure 11 in a cross section perpendicular to the axial direction is S2, then S1 and S2 can satisfy the relationship 5 × S2 ≤ S1 ≤ 50 × S2. Preferably, the relationship between S1 and S2 can be 10 × S2 ≤ S1 ≤ 40 × S2, and more preferably 15 × S2 ≤ S1 ≤ 35 × S2. In this case, the fixing portion 221 can be stably fixed to the tunnel structure 11, and the fixing portion 221 can suitably receive the stress applied thereto. The wall thickness T (mm) of the fixing portion 221 can be 3 mm or more and 10 mm or less (3 mm ≤ T ≤ 10 mm). Preferably, the wall thickness T can be 4 mm or more and 8 mm or less (4 mm ≤ T ≤ 8 mm), and more preferably 4.5 mm or more and 6 mm or less (4.5 mm ≤ T ≤ 6 mm). In this case, the fixing portion 221 can improve rigidity while maintaining flexibility that can follow the shape of the surface of the tunnel structure 11.

[0032] The following describes how to use the injection device 20 mentioned above. Regarding the installation of the injection device 20 to the tunnel structure 11, the injection device 20 is pre-assembled by connecting the injection pipe 21 and the mounting jig 22 before the installation work. During the installation process, a hole 12 is formed in the tunnel structure 11, and then the injection pipe 21 of the injection device 20 is inserted into the hole 12. Next, the anchor bolts 16 are inserted through the fixing holes 223 provided in the fixing portion 221 of the mounting jig 22, and the anchor bolts 16 are driven into the tunnel structure 11 and tightened, thereby fixing the mounting jig 22 of the injection device 20 to the tunnel structure 11, forming the tunnel structure, and completing the installation work (see Figure 1).

[0033] During the installation process, when the fixing portion 221 of the mounting jig 22 is tightened with anchor bolts 16, it exhibits flexibility due to the tensile elastic force of the thermoplastic resin used in its formation, conforming to the shape of the surface of the tunnel structure 11 and taking on a shape corresponding to that shape. As a result, the fixing portion 221 is fixed so as to be in close contact with the surface of the tunnel structure 11 without any gaps.

[0034] As shown in Figure 5, when injecting grout material using the injection device 20, the grout hose 18 is connected to the injection device 20 during the injection process. For connecting the grout hose 18, the tip of the grout hose 18 is inserted into the cylindrical part 23 through the injection port 222 located in the center of the fixing part 221 of the mounting jig 22 of the injection device 20. Furthermore, the grout hose 18 can be connected by providing a connecting means, such as a male threaded portion, at the tip of the grout hose 18, and connecting the tip of the grout hose 18 to a female threaded portion 231 that constitutes the connecting means provided on the cylindrical portion 23, or by connecting them via a coupler or the like.

[0035] After connecting the grout hose 18 to the injection device 20, liquid grout material 15 is sent from the grout hose 18 through the cylindrical section 23 to the injection pipe 21, and then injected from the injection pipe 21 into the cavity 14 on the back side of the tunnel structure 11. The injection of grout material 15 into the cavity 14 continues until the entire cavity 14 is filled with grout material 15.

[0036] The grout injection process is completed when the entire cavity 14 is filled with the grout material 15. The liquid grout material 15 that fills the entire cavity 14 hardens over time, stabilizing the ground of the natural rock 13. After the grout injection work of the grout material 15 is completed, the grout hose 18 can be removed from the injection device 20, and as shown in Figure 6, the cap 24 can be attached to the injection device 20 to close the injection port 222.

[0037] The tunnel structure of the present invention is characterized in that the injection device 20 described above is fixed to the surface of the tunnel structure 11 by anchor bolts 16 via a fixing part 221 (see Figures 1 and 6). As described above, fixing holes 223 can be provided in the fixing portion 221. The anchor bolt 16 is inserted through the fixing hole 223 of the fixing portion 221 and screwed into the tunnel structure 11.

[0038] The tunnel structure is defined as having an injection device 20 fixed to the surface of the tunnel structure 11, and does not require any particular consideration of whether or not the cavity 14 is filled with grout material 15. In other words, the tunnel structure includes both forms in which the cavity 14 is not filled with grout material 15 (see Figure 1) and forms in which the cavity 14 is filled with grout material 15 (see Figure 6). In the case where the tunnel structure is in a form in which grout material 15 is filled into the cavity 14, the injection device 20 can be configured with a cap 24 attached (see Figure 6). The cap 24 closes the injection port 222 provided on the fixing part 221 of the injection device 20. By attaching this cap 24, the tunnel structure can prevent leakage of liquid such as grout material 15 or rainwater from the ground 13 from the injection port 222. For attaching the cap 24, a connecting means, such as a male screw portion, can be provided at the base end of the cap 24, and the base end of the cap 24 can be connected to the female screw 231 that constitutes the connecting means provided on the cylindrical portion 23. Alternatively, the cap 24 can be attached by providing, for example, a cylindrical insertion portion at the base end of the cap 24, and fitting or inserting this insertion portion into the inside of the cylindrical portion 23 via the injection port 222. In this configuration, the insertion portion provided on the cap 24 can also be bonded to the cylindrical portion 23.

[0039] The tunnel structure can be configured such that a sealing portion 17 is interposed between the fixing portion 221 and the tunnel structure 11. In this case, the sealing portion 17 can effectively prevent the formation of a gap between the fixing portion 221 and the tunnel structure 11. The sealing portion 17 can be formed using one or more selected from the group consisting of caulking agent, resin sheet, resin packing, and O-ring. Examples of resin sheets include rubber sheets and silicone sheets, while examples of resin gaskets include rubber gaskets and sponge gaskets.

[0040] In the injection device 20 and tunnel structure described above, the liquid grout material 15 injected into the cavity 14 flows back into the hole 12 and injection pipe 21, accumulating inside them and applying stress to the fixing part 221 of the mounting jig 22 due to internal pressure. When this stress is applied to the fixing part 221, it usually bends in the direction toward the inside of the tunnel (downward in Figures 5 and 6), creating a gap between it and the surface of the tunnel structure 11. The fixing portion 221 of the injection device 20 is formed using a thermoplastic resin with a tensile modulus of 1000 MPa to 5000 MPa. This fixing portion 221, even when subjected to stress due to internal pressure, relieves stress through its elasticity and maintains a state of tight, gap-free contact with the surface of the tunnel structure 11, thereby preventing the formation of gaps.

[0041] If the formation of a gap between the fixing part 221 and the surface of the tunnel structure 11 is prevented, then so-called "liquid leakage," where rainwater from the grout material 15 or the ground 13 leaks into the interior of the tunnel through the gap, can be prevented. By preventing such liquid leaks, it is possible to prevent the anchor bolts 16 that fix the injection device 20 to the tunnel structure 11 from rusting or the facilities inside the tunnel from corroding due to water leakage or condensation. Furthermore, if deformation occurs in the tunnel due to an earthquake, the fixing part 221 is formed using a thermoplastic resin with a tensile modulus of 1000 MPa to 5000 MPa. Therefore, its elasticity can alleviate the stress caused by the deformation, thus preventing damage to the injection device 20. [Industrial applicability]

[0042] In the field of civil engineering, particularly in tunnel construction, when injecting grout material into the gap between the ground, soil, or bedrock and the tunnel structure to fill and reinforce it, the injection device of the present invention can prevent leakage of liquid at the injection site. [Explanation of Symbols]

[0043] 11; tunnel structure, 12; borehole, 13; natural ground, 14; cavity, 15; grout material, 16; Anchor bolt, 17; Seal part, 18; Grout hose, 20; injection equipment, 21; Injection tube, 211; Male thread part, 22; Mounting fixture, 221;Fixing part, 222;Inlet, 223;Fixing hole, 23; cylindrical part, 231; female thread, 24; Cap.

Claims

1. The system comprises an injection pipe inserted into a hole in a tunnel structure, and a mounting jig connected to the base end of the injection pipe and fixed to the surface of the tunnel structure. The mounting jig comprises a fixing portion positioned along the surface of the tunnel structure and a cylindrical portion connected to the base end of the injection pipe. The aforementioned fixing portion is formed using a thermoplastic resin with a tensile modulus of 1000 MPa or more and 5000 MPa or less. The thickness of the aforementioned fixing part is 3 mm or more and 10 mm or less. An injection device characterized in that the fixing portion has the flexibility to conform to the curved surface of the tunnel structure.

2. The injection device according to claim 1, wherein the fixing portion is formed in the shape of a plate.

3. The injection device according to claim 1 or 2, where S1 is the planar area of ​​the fixed portion and S2 is the area of ​​the hole portion in a cross-section perpendicular to the axial direction, and S1 and S2 satisfy the relationship 5 × S2 ≤ S1 ≤ 50 × S2.

4. The injection device according to any one of claims 1 to 3, wherein when the height of the cylindrical portion is h and the inner diameter of the hole portion is a, h and a satisfy the relationship h > a.

5. The injection device according to any one of claims 1 to 4, wherein the fixing portion is formed in a circular shape when viewed from above.

6. A tunnel structure characterized in that the injection device described in any one of claims 1 to 5 is fixed to the surface of the tunnel structure by anchor bolts via the fixing portion.

7. The tunnel structure according to claim 6, wherein a sealing portion is interposed between the fixing portion and the tunnel structure.

8. The tunnel structure according to claim 7, wherein the sealing portion is formed using one or more selected from the group consisting of caulking agent, resin sheet, resin packing, and O-ring.

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