Reinforcing structure for tunnel broken surrounding rock

Abstract

The utility model relates to the technical field of tunnel surrounding rock reinforcement, in particular to a reinforcement structure for tunnel broken surrounding rock. Comprising a steel wire mesh fixing frame and a steel wire mesh, the steel wire mesh fixing frame is a square frame body, and the steel wire mesh is flatly laid in the steel wire mesh fixing frame; connecting blocks are fixed to the two opposite corners of the steel wire mesh fixing frame, screw holes are formed in the connecting blocks, fixing rods penetrate through the screw holes, through threads are arranged on the outer walls of the fixing rods, and the fixing rods are screwed with the screw holes in a threaded mode. One end of the fixing rod is provided with a grouting opening, and the other end of the fixing rod is provided with a grout outlet; after the crack is grouted and blocked, a steel wire mesh fixing frame and a steel wire mesh cover the inlet of the crack, the steel wire mesh fixing frame is fixed through fixing rods at the opposite angles, and then the steel wire mesh fixing frame and the steel wire mesh are trowelled with concrete; the grouting material is weak in tensile capacity, tensile stress is resisted through the steel wire mesh fixing frame and the steel wire mesh, and secondary cracking of the crack is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel surrounding rock reinforcement, in particular to a reinforcement structure for tunnel crushing surrounding rock. Background Art

[0002] Tunnel crushed surrounding rock refers to the phenomenon that the surrounding rock mass becomes crushed, cracked and loose during the excavation or use of the tunnel. Tunnel crushed surrounding rock is a common geological problem that may pose a threat to the stability and safety of the tunnel during the excavation or use of the tunnel.

[0003] At present, grouting reinforcement is used to repair the problem of cracks in the tunnel surrounding rock. However, the grouting material can only withstand pressure after solidification and has weak tensile strength. The development of cracks in the tunnel surrounding rock is mainly based on tensile stress. Therefore, secondary cracks often occur in the crack area after repair. Utility Model Content

[0004] An object of the present invention is to solve at least the above problems and to provide at least the advantages to be described below.

[0005] The utility model provides the following technical solutions: a reinforcement structure for tunnel crushing surrounding rock, comprising a wire mesh fixing frame and a wire mesh; the wire mesh fixing frame is a square frame, and the wire mesh is flatly laid in the wire mesh fixing frame; connecting blocks are fixed at two diagonal portions of the wire mesh fixing frame, screw holes are opened on the connecting blocks, fixing rods are inserted into the screw holes, the outer wall of the fixing rod is provided with a full-body thread, and the fixing rod is screwed together with the screw hole thread; the fixing rod is hollow inside, one end of the fixing rod is provided with a grouting port, and the other end is provided with a slurry outlet.

[0006] Furthermore, the wire mesh fixing frame is divided into a first bracket and a second bracket along the diagonal line; the first bracket and the second bracket are connected by a first hinge and a second hinge.

[0007] Furthermore, a nut is threadedly connected to the fixing rod, and a support rod is connected between the nuts on the fixing rods at two diagonal positions of the wire mesh fixing frame, and the support rod leans against the wire mesh fixing frame.

[0008] Furthermore, the support rod is divided into two sections, and the two sections of the support rod are connected by a third hinge. When the support rod is unfolded, a fixing piece is installed on the support rod at the third hinge.

[0009] Furthermore, a fixed grouting barrel is connected to the outer surface of the grouting port of the fixed rod, the first barrel mouth of the fixed grouting barrel is connected to the end face of the nut, a sliding grouting barrel is movably connected to the outer surface of the fixed grouting barrel, the second barrel mouth of the fixed grouting barrel is located inside the sliding grouting barrel, the outer wall of the fixed grouting barrel and the inner wall of the sliding grouting barrel are slidably sealed; a lateral hole is opened on the fixed grouting barrel near the first barrel mouth.

[0010] Furthermore, the fixing member includes two metal cable ties, which are connected by a support plate. The two metal cable ties are clamped on both sides of the third hinge, and the support plate is abutted against the support rod.

[0011] Furthermore, a limit ring is provided on the support rod, and the limit ring is tied and connected to the wire mesh.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] The utility model provides a reinforcement structure for broken surrounding rock of a tunnel. Due to the narrow space inside the crack, it is difficult to place steel bars inside the crack. Even if the steel bars can be placed, it is difficult to effectively connect the steel bars with the surrounding rock. After the crack is sealed by grouting, a wire mesh fixing frame and a wire mesh are covered at the entrance of the crack. The wire mesh fixing frame is fixed by fixing rods at the diagonal positions. Then, the wire mesh fixing frame and the wire mesh are smoothed with concrete to effectively prevent the crack from cracking again. The grouting material has weak tensile strength and resists tensile stress through the wire mesh fixing frame and the wire mesh. Support rods are connected between the fixing rods, and the support rods can also bear part of the tensile stress. In addition, the wire mesh fixing frame and the support rods can be folded for easy carrying. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the reinforcement structure used for tunnel crushing surrounding rock;

[0015] Figure 2 It is a schematic diagram of the wire mesh fixing frame and the wire mesh;

[0016] Figure 3 This is a schematic diagram of the connection between the nut, fixed grouting barrel and sliding grouting barrel;

[0017] Figure 4 Schematic diagram of fixed grouting drum and sliding grouting drum.

[0018] In the figure: 1-first bracket; 2-wire mesh; 3-first hinge; 4-second bracket; 5-connecting block; 6-fixing rod; 7-grouting port; 8-nut; 9-fixed grouting cylinder; 10-sliding grouting cylinder; 11-support rod; 12-second hinge; 13-lateral hole; 14-limiting ring; 15-fixing piece; 16-third hinge; 17-slurry outlet. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] like Figure 1 、 Figure 2 As shown: A reinforcement structure for tunnel crushing surrounding rock, including a wire mesh fixing frame and a wire mesh 2; the wire mesh fixing frame is a square frame, and the wire mesh 2 is laid flat in the wire mesh fixing frame; connecting blocks 5 are fixed at the two diagonal corners of the wire mesh fixing frame, and screw holes are opened on the connecting blocks 5, and fixing rods 6 are inserted into the screw holes. The outer wall of the fixing rod 6 is provided with a full-body thread, and the fixing rod 6 is screwed into the screw hole thread; the fixing rod 6 is hollow inside, and one end of the fixing rod 6 is provided with a grouting port 7 and the other end is provided with a slurry outlet 17.

[0021] The crack is characterized by its narrow length. Therefore, during installation, the diagonal lines of the wire mesh fixing frame are roughly aligned with the crack. The wire mesh fixing frame is secured using fixing rods 6 at the other two diagonals. The square shape of the wire mesh fixing frame provides a wide connection range between the wire mesh 2 and the tunnel structure on both sides of the crack, making the installation of the wire mesh 2 more secure. Fixing rods 6 can be grout-anchored. After fixing rods 6 are screwed into the surrounding rock, grouting ports 7 are connected to the grouting pipeline.

[0022] The wire mesh fixing frame can be folded for easy carrying. The wire mesh fixing frame is divided into a first bracket 1 and a second bracket 4 along a diagonal line. The first bracket 1 and the second bracket 4 are connected by a first hinge 3 and a second hinge 12 .

[0023] Nuts 8 are threaded onto the fixing rods 6. Support rods 11 are connected between the nuts 8 on the fixing rods 6 at two diagonal positions of the wire mesh fixing frame. Support rods 11 rest against the wire mesh fixing frame. After the wire mesh fixing frame is installed, support rods 11 provide auxiliary support for the wire mesh fixing frame and the wire mesh 2. Support rods 11 are provided with limit rings 14, which are tied to the wire mesh 2. Figure 1 In order to more clearly show the structure of each part, the support rod 11 is suspended above the wire mesh fixing frame and the wire mesh 2; during actual installation, the nut 8 is pressed on the top of the connecting block 5, and then the fixing rod 6 is screwed into the nut 8 and the connecting block 5.

[0024] like Figure 3 As shown, the strut 11 is divided into two sections, which are connected by a third hinge 16. When the strut 11 is unfolded, a fixing member 15 is installed on the strut 11 at the third hinge 16 to prevent the strut 11 from bending.

[0025] The fixing member 15 includes two metal cable ties connected by a support plate. The two metal cable ties are clamped on both sides of the third hinge 16 , and the support plate is against the support rod 11 .

[0026] like Figure 4As shown: the grouting port 7 of the fixed rod 6 is externally connected with a fixed grouting tube 9, the first tube mouth of the fixed grouting tube 9 is connected to the end face of the nut 8, the fixed grouting tube 9 is movably connected with a sliding grouting tube 10, the second tube mouth of the fixed grouting tube 9 is located in the sliding grouting tube 10, and the outer wall of the fixed grouting tube 9 is slidably sealed with the inner wall of the sliding grouting tube 10; a lateral hole 13 is opened on the fixed grouting tube 9 near the first tube mouth, and the lateral holes 13 are arranged around the fixed grouting tube 9 at equal intervals. After the fixed rod 6 is drilled into the surrounding rock, the fixed grouting tube 9 is inserted into the fixed rod 6, and the insertion part is located below the lateral hole 13 to keep the lateral hole 13 unobstructed. The sliding grouting tube 10 is connected to the grouting equipment. In the first stage of grouting, the sliding grouting tube 10 slides to close the lateral hole 13, and the slurry in the sliding grouting tube 10 is completely injected into the fixed rod 6. After the fixed rod 6 is filled with slurry, the position of the sliding grouting tube 10 is changed to expose the lateral hole 13. The slurry flows to the surrounding area of ​​the fixed rod 6 through the lateral hole 13. After the slurry completely covers the nut 8, the fixed grouting tube 9 is removed from the fixed rod 6 before the slurry solidifies.

[0027] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reinforcement structure for tunnel crushing surrounding rock, characterized by: The invention comprises a wire mesh fixing frame and a wire mesh (2); the wire mesh fixing frame is a square frame, and the wire mesh (2) is laid flat in the wire mesh fixing frame; connecting blocks (5) are fixed at two diagonal positions of the wire mesh fixing frame, the connecting blocks (5) are provided with screw holes, and fixing rods (6) are inserted into the screw holes, and the outer wall of the fixing rod (6) is provided with full-body threads, and the fixing rod (6) is screwed into the screw holes; the fixing rod (6) is hollow inside, and one end of the fixing rod (6) is provided with a grouting port (7) and the other end is provided with a slurry outlet (17).

2. A reinforcement structure for tunnel crushing surrounding rock according to claim 1, characterized in that: The wire mesh fixing frame is divided into a first bracket (1) and a second bracket (4) along a diagonal line; the first bracket (1) and the second bracket (4) are connected via a first hinge (3) and a second hinge (12).

3. A reinforcement structure for tunnel crushing surrounding rock according to claim 2, characterized in that: The fixing rod (6) is threadedly connected with a nut (8), and a support rod (11) is connected between the nuts (8) on the fixing rods (6) at two diagonal positions of the wire mesh fixing frame, and the support rod (11) leans against the wire mesh fixing frame.

4. A reinforcement structure for tunnel crushing surrounding rock according to claim 3, characterized in that: The support rod (11) is divided into two sections, and the two sections of the support rod (11) are connected by a third hinge (16). When the support rod (11) is unfolded, a fixing piece (15) is installed on the support rod (11) at the third hinge (16).

5. The reinforcement structure for tunnel crushing surrounding rock according to claim 3, characterized in that: The grouting port (7) of the fixed rod (6) is externally connected with a fixed grouting barrel (9), the first barrel opening of the fixed grouting barrel (9) is connected to the end face of the nut (8), the fixed grouting barrel (9) is movably connected with a sliding grouting barrel (10), the second barrel opening of the fixed grouting barrel (9) is located inside the sliding grouting barrel (10), the outer wall of the fixed grouting barrel (9) and the inner wall of the sliding grouting barrel (10) are slidably sealed; a lateral hole (13) is opened on the fixed grouting barrel (9) near the first barrel opening.

6. The reinforcement structure for tunnel crushing surrounding rock according to claim 4, characterized in that: The fixing member (15) comprises two metal straps, which are connected via a support plate. The two metal straps are clamped on both sides of the third hinge (16), and the support plate is abutted against the support rod (11).

7. The reinforcement structure for tunnel crushing surrounding rock according to claim 4, characterized in that: A limiting ring (14) is provided on the support rod (11), and the limiting ring (14) is tied and connected to the wire mesh (2).

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