Combined structure for repairing tunnel cracks

Abstract

The utility model relates to a combined structure for repairing tunnel cracks. At present, an existing repairing method is not suitable for common cracks with the width smaller than 2 mm on the surface of a tunnel lining, and rapid local water stopping and leaking stoppage cannot be achieved. The device comprises a W-shaped steel belt, hollow grouting anchor rods and self-propelled anchor rods, the W-shaped steel belt is tightly attached to the inner surface of the existing lining with cracks and is longitudinally arranged on the inner surface of the existing lining at intervals, one end of each hollow grouting anchor rod is fixed to the W-shaped steel belt, the other end of each hollow grouting anchor rod penetrates through the existing lining to extend to the periphery of the existing lining, and the self-propelled anchor rods are arranged on the W-shaped steel belt. The self-propelled anchor rod is arranged at the arch foot position of the existing lining and used for fixing the root of the W steel belt, the surface layer of the crack of the existing lining is coated with epoxy resin mortar for multiple times, then the W steel belt is positioned, and finally the hollow grouting anchor rod and the self-propelled anchor rod are driven to repair the crack of the tunnel. According to the utility model, quick local water stopping and leaking stoppage can be realized for common cracks.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel operation and maintenance, and particularly relates to a combined structure for tunnel crack repair. Background Technique

[0002] Tunnel lining refers to a permanent structure that supports and maintains the long-term stability and durability of a tunnel, which can support and maintain the stability of the tunnel, keep the space required for train operation, prevent the weathering of surrounding rocks, relieve the influence of groundwater, etc. Tunnel cracks are usually caused by natural environmental factors such as geological structures, earthquakes, hydrological fluctuations, temperature changes, or human factors.

[0003] With the increase in the operation service time of railway tunnels, tunnel linings often show water seepage phenomena along with the development of surface cracks. The further development of cracks will seriously affect the durability and driving safety of the tunnel. The hazards of tunnel cracks are mainly manifested in the following aspects: 1. Affect driving safety: Tunnel cracks will cause the collapse of the shaft wall, thus endangering the driving safety in the tunnel; 2. Increase maintenance costs: Tunnel cracks will affect the traffic capacity and service life, increasing the maintenance costs of the tunnel; 3. Environmental pollution: Tunnel cracks may cause groundwater pollution, thus affecting the surrounding environment.

[0004] In order to ensure the safety of the tunnel and extend its service life, it is necessary to repair tunnel cracks in a timely manner. The existing tunnel crack repair methods are as follows: 1. Grouting reinforcement: mainly injecting polyurethane resin or cement slurry with a long curing time into the cracks to achieve the purpose of reinforcement. Grouting reinforcement has the advantages of simple construction, low cost, good consolidation effect, etc., but there are problems such as leakage in grouting reinforcement; 2. Steel bar reinforcement: Steel bar reinforcement is to drill holes in the cracks and then fix the steel bars in the holes to achieve the purpose of reinforcement. This method has the characteristics of high strength and good stability, but the steel bars need to be anti-corrosion treated, and the construction technical requirements are relatively high. For general cracks with a surface width less than 2 mm in the tunnel lining, the above two repair methods are not applicable and cannot achieve rapid local water stop and leakage prevention.

[0005] Therefore, there is an urgent need for a repair structure that can quickly and effectively inhibit the development of cracks and stop water leakage. Summary of the Invention

[0006] The purpose of the utility model is to provide a combined structure for tunnel crack repair to at least solve the problem that it is currently impossible to quickly and locally stop water leakage and plug leaks for general cracks.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] A combined structure for tunnel crack repair, including a W-shaped steel strip, a hollow grouting bolt, and a self-advancing bolt. The W-shaped steel strip is closely attached to the inner surface of the existing lining with cracks and is longitudinally arranged at intervals on its inner surface. One end of the hollow grouting bolt is fixed to the W-shaped steel strip, and the other end passes through the existing lining and extends to the outside of the existing lining. The self-advancing bolt is arranged at the arch foot of the existing lining to fix the root of the W-shaped steel strip. By first applying epoxy resin mortar multiple times on the surface layer of the crack in the existing lining, then positioning the W-shaped steel strip, and finally driving the hollow grouting bolt and the self-advancing bolt, the crack in the tunnel is repaired.

[0009] Further, an anchor bolt hole is provided at the middle position of the W-shaped steel strip.

[0010] Further, one end of the hollow grouting bolt is fixed in the anchor bolt hole.

[0011] Further, the hollow grouting bolts are arranged circumferentially on the outside of the existing lining.

[0012] Further, the spacing of the anchor bolt holes corresponds to the circumferential spacing of the hollow grouting bolts.

[0013] Further, the spacing between adjacent W-shaped steel strips is not greater than 1 cm.

[0014] Further, the range for applying the epoxy resin mortar on the surface layer of the crack in the existing lining is 14 - 16 cm on each side of the crack.

[0015] Further, the number of times of applying the epoxy resin mortar is at least three times.

[0016] Further, after the hollow grouting bolt penetrates through the existing lining and the waterproof board, 1:1 cement slurry grouting is carried out.

[0017] Further, the grouting pressure of the self-advancing bolt is 0.5 - 1.5 MPa.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] 1. The present utility model adopts a simple combined anchoring structure of bolts and steel strips, which can quickly and effectively repair general cracks with a width less than 2 mm on the surface of the tunnel lining and achieve the purpose of water stopping, improving the durability of the lining structure. The present utility model is light in weight and convenient for maintenance, and can be maintained by using the skylight time, and can be widely used for the treatment of diseases of general cracks in existing tunnel linings.

[0020] 2. After applying epoxy resin mortar several times on the surface of general cracks in the existing lining, the W-shaped steel strip is closely attached to the surface of the existing lining and longitudinally arranged in a dense row. Then, the W-shaped steel strip is fixed by using hollow grouting bolts and self-advancing bolts in combination with the W-shaped steel strip, which is convenient to improve the overall reinforcement effect, make full use of the combined structure of bolts and W-shaped steel strips, inhibit the potential development of lining cracks, and achieve rapid local water stoppage and leak plugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for description in the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 is a schematic cross-sectional view of the present invention installed in a tunnel;

[0023] Figure 2 is Figure 1 a schematic installation view of the W-shaped steel strip and the hollow grouting bolt in [Figure];

[0024] Figure 3 is a schematic structural view of the W-shaped steel strip;

[0025] Figure 4 is a schematic plan layout view of the W-shaped steel strip and the hollow grouting bolt;

[0026] Figure 5 is a schematic view of epoxy resin mortar applied on the left and right of the crack;

[0027] The labels in the figures are:

[0028] 1 - W-shaped steel strip, 2 - hollow grouting bolt, 3 - self-advancing bolt, 4 - existing lining, 5 - bolt hole, 6 - crack, 7 - epoxy resin mortar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0030] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "coupling", "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] Embodiment:

[0033] As Figure 1 shown, a combined structure for tunnel crack repair includes a W-shaped steel strip 1, a hollow grouting bolt 2 and a self-advancing bolt 3. After the surface layer of the crack 6 in the existing lining 4 is coated with epoxy resin mortar 7 multiple times, the W-shaped steel strip 1 is positioned, and finally the hollow grouting bolt 2 and the self-advancing bolt 3 are driven. The W-shaped steel strip 1 is used in combination with the hollow grouting bolt 2 and the self-advancing bolt 3, and the W-shaped steel strip 1 is fixed by the hollow grouting bolt 2 and the self-advancing bolt 3 to improve the overall reinforcement effect.

[0034] Among them, the range of coating the epoxy resin mortar 7 on the surface layer of the crack 6 in the existing lining 4 is 14 - 16 cm on each side of the crack 6. As Figure 5 shown, in this embodiment, the coating range is 15 cm on each side of the crack 6.

[0035] The number of times of coating the epoxy resin mortar 7 is at least three times.

[0036] Furthermore, the W-shaped steel strip 1 is closely attached to the inner surface of the existing lining 4 with the crack 6 and is longitudinally arranged at close intervals on the inner surface. As Figure 3 shown, both ends of the W-shaped steel strip 1 are semi-circular, and bolt holes 5 are reserved on the W-shaped steel strip 1, and the bolt holes 5 are arranged at the middle position between the semi-circles at both ends.

[0037] The distance between adjacent W-shaped steel strips 1 is not greater than 1 cm.

[0038] As Figure 2 and Figure 4As shown in the figure, one end of the hollow grouting bolt 2 is fixed in the bolt hole 5 on the W-steel strip 1, and the other end passes through the existing lining 4 and extends to the outer periphery of the existing lining 4. The hollow grouting bolts 2 are arranged circumferentially on the outer periphery of the existing lining 4, and the W-steel strip 1 is fixed on the inner surface of the existing lining 4 through the hollow grouting bolts 2.

[0039] Furthermore, after the hollow grouting bolt 2 penetrates through the existing lining 4 and the waterproof board, it is necessary to grout with cement slurry at a ratio of 1:1 to ensure that the existing lining 4 at the location where the hollow grouting bolt 2 is driven does not leak water.

[0040] Among them, the spacing of the bolt holes 5 is correspondingly set with the circumferential spacing of the hollow grouting bolts 2.

[0041] In this embodiment, the self-advancing bolts 3 are respectively fixed at the two arch feet of the existing lining 4 for fixing the root of the W-steel strip 1.

[0042] The grouting pressure of the self-advancing bolt 3 is 0.5 - 1.5 MPa. Before grouting, tests must be carried out on site to determine appropriate grouting parameters, so as to ensure the grouting reinforcement and water-blocking effects.

[0043] The installation and use process of this embodiment is as follows:

[0044] First, apply epoxy resin mortar 7 three times in the range of about 15 cm on both the left and right sides of the surface of the general crack 6 of the existing lining 4.

[0045] Then, closely attach the W-steel strip 1 to the surface of the existing lining 4 where the crack 6 develops and arrange it longitudinally in a dense row.

[0046] Finally, pass the hollow grouting bolt 2 through the bolt hole 5 on the W-steel strip 1 and fix it with bolts, and fix the self-advancing bolt 3 at the arch feet of the existing lining 4, so as to fix the W-steel strip 1.

[0047] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not used to limit the present invention. For those skilled in the technical field to which the present invention belongs, based on the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A combined structure for tunnel crack repair, characterized in that: The combined structure comprises a W-steel belt (1), a hollow grouting anchor rod (2) and a self-propelled anchor rod (3); the W-steel belt (1) is closely attached to the inner surface of an existing lining (4) having a crack (6) and is arranged at intervals in the longitudinal direction on the inner surface; one end of the hollow grouting anchor rod (2) is fixed to the W-steel belt (1), and the other end passes through the existing lining (4) and extends to the outer periphery of the existing lining (4); the self-propelled anchor rod (3) is arranged at the arch foot of the existing lining (4) and is used to fix the root of the W-steel belt (1); the crack (6) in the tunnel is repaired by first applying epoxy resin mortar (7) multiple times on the surface of the crack (6) in the existing lining (4), then positioning the W-steel belt (1), and finally applying the hollow grouting anchor rod (2) and the self-propelled anchor rod (3); The distance between adjacent W steel strips (1) is no greater than 1 cm; The crack (6) is a general crack with a width less than 2 mm; Both ends of the W steel strip (1) are semicircular in shape.

2. The combined structure for tunnel crack repair according to claim 1, characterized in that: An anchor hole (5) is provided in the middle of the W steel belt (1).

3. The combined structure for tunnel crack repair according to claim 2, characterized in that: One end of the hollow grouting anchor rod (2) is fixed in the anchor rod hole (5).

4. The combined structure for tunnel crack repair according to claim 1, characterized in that: The hollow grouting anchor rods (2) are arranged in a circumferential direction around the existing lining (4).

5. The combined structure for tunnel crack repair according to claim 2, characterized in that: The spacing between the anchor holes (5) corresponds to the circumferential spacing between the hollow grouting anchors (2).

6. The combined structure for tunnel crack repair according to claim 1, characterized in that: The epoxy resin mortar (7) is applied to the surface of the crack (6) of the existing lining (4) in a range of 14-16 cm on either side of the crack (6).

7. The combined structure for tunnel crack repair according to claim 1, characterized in that: The epoxy resin mortar (7) is applied at least three times.

8. The combined structure for tunnel crack repair according to claim 1, characterized in that: After the hollow grouting anchor rod (2) penetrates the existing lining (4) and the waterproof board, 1:1 cement grouting is performed.

9. The combined structure for tunnel crack repair according to claim 1, characterized in that: The grouting pressure of the self-advancing anchor rod (3) is 0.5-1.5 MPa.

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