Roadway grouting reinforcement structure

Abstract

The utility model discloses a roadway grouting reinforcement structure, which is characterized in that a plurality of grouting units are uniformly arranged on a roadway bottom plate, each grouting unit comprises a grouting deep hole, a sectional type deep hole slurry pipe is arranged in each grouting deep hole, a plurality of grouting shallow holes are arranged around the deep hole slurry pipes, and the grouting shallow holes are communicated with the deep hole slurry pipes. A sealing plug ring is arranged between any two adjacent sections of deep-hole slurry pipes, a central grouting pipe is arranged in each deep-hole slurry pipe, a grouting hole is formed in each central grouting pipe, and a grouting punch is inserted into the outer wall of each deep-hole slurry pipe in a sliding manner; the deep hole grouting device has the advantages that shallow hole grouting and deep hole segmented grouting are combined, the pressure maintaining effect of shallow layer sealing and deep layer grouting is good, meanwhile, the grouting punch is designed to conduct stress impact on a deep hole rock wall, tiny cracks appear, slurry can permeate into the deep hole rock wall quickly, it is guaranteed that broken surrounding rock is effectively modified, and the service life of the deep hole rock wall is prolonged. And the grouting effect is obviously improved.

Description

Technical field:

[0001] The utility model relates to the technical field of tunnel grouting reinforcement, in particular to a tunnel grouting reinforcement structure. Background technology:

[0002] Due to the deep burial depth, high stress level and low surrounding rock strength of deep soft rock tunnels, the surrounding rock stress needs to be readjusted to achieve a new balance after the tunnel is excavated. The surrounding rock is affected by the stress concentration and gradually becomes loose and broken from shallow to deep. The tunnel roof and both sides are supported by anchor nets, anchor injection or scaffolding. The methods of bottom plate reinforcement mainly include the undercover method and reinforcement method. The undercover method is a method of directly removing the bottom drum coal rock mass. The reinforcement method mainly includes bottom plate grouting, bottom plate anchor rod and other reinforcement methods. Among them, bottom plate grouting is the most commonly used reinforcement measure. The common technical problems in the construction process of bottom plate grouting are poor deep hole grouting effect and difficulty in maintaining grouting pressure (shallow grouting is injected first during grouting, resulting in shallow slurry running). The slurry is difficult to inject into the tiny cracks at the bottom of the deep hole, resulting in poor grouting strength. Utility model content:

[0003] The utility model aims to provide a tunnel grouting reinforcement structure to solve the technical problems of low penetration rate and poor grouting effect of deep hole grouting in tunnel bottom plate in the prior art.

[0004] The content of the utility model: a tunnel grouting reinforcement structure, a plurality of grouting units are evenly arranged on the tunnel bottom plate, the grouting unit comprises a grouting deep hole, a segmented deep hole grouting pipe is installed in the grouting deep hole, a plurality of shallow grouting holes are arranged around the deep hole grouting pipe, a sealing plug ring is provided between any two adjacent sections of the deep hole grouting pipe, a central grouting pipe is provided in the deep hole grouting pipe, a grouting hole is opened on the central grouting pipe, a grouting punch is slidably inserted into the outer wall of the deep hole grouting pipe, and the central grouting pipe squeezes the pointed end of the grouting punch into the rock wall.

[0005] Furthermore, the sealing ring is made of rubber, the inner hole of the sealing ring is smaller than the outer diameter of the central grouting pipe, and the central grouting pipe is inserted into the inner hole of the sealing ring so that the sealing ring expands to seal the grouting deep hole.

[0006] Furthermore, an insertion hole is opened on the outer wall of the deep hole grouting pipe, the hollow grouting punch is inserted into the insertion hole, and a crack grouting hole is opened at the pointed end of the grouting punch.

[0007] Furthermore, an impact half hole is opened at the inner end of the grouting punch, and the diameter of the impact half hole is smaller than the outer diameter of the central grouting pipe.

[0008] Furthermore, the socket and the grouting punch are clearance fit or transition fit.

[0009] Furthermore, the grouting punch is made of high manganese steel.

[0010] The beneficial effects of the utility model are as follows: the utility model arranges the grouting units more reasonably, combines shallow hole grouting with deep hole segmented grouting, achieves shallow sealing, and has a good deep grouting pressure maintenance effect. At the same time, the grouting punch is designed to perform stress impact on the deep hole rock wall to make tiny cracks appear, which is conducive to the rapid infiltration of slurry, ensures effective modification of fractured surrounding rock, and significantly improves the grouting support effect, which is worthy of large-scale promotion and use. Description of the drawings:

[0011] Figure 1 It is a top view of the utility model;

[0012] Figure 2 This is a cross-sectional view of the utility model when the central grouting pipe is not installed;

[0013] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0014] Figure 4 This is a cross-sectional view of the utility model when the central grouting pipe is installed;

[0015] Figure 5 for Figure 4 Schematic diagram of the enlarged structure;

[0016] In the figure, there are deep hole grouting pipe 1, shallow grouting hole 2, sealing plug ring 3, grouting hole 4, fissure grouting hole 5, impact half hole 6, grouting punch 7, central grouting pipe 8, grouting unit 9, grouting deep hole 10, and plug hole 11. Specific implementation method:

[0017] like Figures 1 to 4 As shown, a tunnel grouting reinforcement structure is provided, in which a plurality of grouting units are evenly arranged on the tunnel bottom plate, the grouting units include a grouting deep hole 10, in which a segmented deep hole grouting pipe 1 is installed, a plurality of shallow grouting holes 2 are arranged around the deep hole grouting pipe 1, a sealing plug ring 3 is provided between any two adjacent sections of the deep hole grouting pipe 1, a central grouting pipe 8 is provided in the deep hole grouting pipe 1, a grouting hole 4 is opened in the central grouting pipe 8, a grouting punch 7 is slidably inserted into the outer wall of the deep hole grouting pipe 1, and the central grouting pipe 8 squeezes the pointed end of the grouting punch 7 into the rock wall.

[0018] In order to improve the sealing effect of the sealing plug ring 3, it is ensured that the sealing plug ring 3 is fully fitted with the inner wall of the grouting deep hole 10. Figure 5As shown, the sealing ring 3 is made of rubber, the inner hole of the sealing ring 3 is smaller than the outer diameter of the central grouting pipe 8, and the central grouting pipe 8 is inserted into the inner hole of the sealing ring 3 to make the sealing ring 3 expand and seal the grouting deep hole 10.

[0019] like Figure 2 and Figure 3 As shown, a socket 11 is opened on the outer wall of the deep hole grouting pipe 1, and the hollow grouting punch 7 is inserted in the socket 11, and a fissure grouting hole 5 is opened at the pointed end of the grouting punch 7; an impact half hole 6 is opened at the inner end of the grouting punch 7, and the diameter of the impact half hole 6 is smaller than the outer diameter of the central grouting pipe 8. The socket 11 and the grouting punch 7 are clearance fit or transition fit; in order to improve the hardness of the grouting punch 7, the grouting punch 7 is made of high manganese steel.

[0020] During the specific construction, according to Figure 1 In the arrangement mode, a shallow grouting hole 2 and a deep grouting hole 10 are drilled, and grouting is firstly performed in the shallow grouting hole 2, so that the grouting liquid penetrates into the cracks in the rock wall of the shallow grouting hole 2, thereby sealing the cracks in the upper part of the deep grouting hole 10; Figures 2 to 5 As shown, multiple deep hole grouting pipes 10 (grouting punches 7 are installed in the socket 11 in advance) and sealing plug rings 3 are installed in sections in the grouting deep hole 10, and a central grouting pipe 8 (the end of the central grouting pipe 8 is a pointed head) is drilled into the deep hole grouting pipe 1. The central grouting pipe 8 passes through the sealing plug ring 3 so that the sealing plug ring 3 expands outward and seals. The central grouting pipe 8 penetrates into the impact half hole 6 (the impact half hole 6 also has a grouting function and is a channel for the slurry to enter the grouting punch 7), so that the grouting punch 7 is drilled into the rock wall of the grouting deep hole 10, and stress is applied to make cracks appear to facilitate the infiltration of slurry. Finally, grouting is injected into the central grouting pipe 8 to realize segmented grouting. The grouting pressure is well maintained and the grouting is more sufficient and reliable.

[0021] The above are only preferred examples of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tunnel grouting reinforcement structure, characterized in that: A plurality of grouting units are evenly arranged on the bottom plate of the tunnel, and the grouting units include a grouting deep hole (10), a segmented deep hole grouting pipe (1) is installed in the grouting deep hole (10), a plurality of shallow grouting holes (2) are arranged around the deep hole grouting pipe (1), a sealing plug ring (3) is arranged between any two adjacent sections of the deep hole grouting pipe (1), a central grouting pipe (8) is arranged in the deep hole grouting pipe (1), a grouting hole (4) is opened on the central grouting pipe (8), a grouting punch (7) is slidably inserted into the outer wall of the deep hole grouting pipe (1), and the central grouting pipe (8) squeezes the pointed end of the grouting punch (7) into the rock wall.

2. A tunnel grouting reinforcement structure according to claim 1, characterized in that: The sealing ring (3) is made of rubber, the inner hole of the sealing ring (3) is smaller than the outer diameter of the central grouting pipe (8), and the central grouting pipe (8) is inserted into the inner hole of the sealing ring (3) so that the sealing ring (3) expands and seals the grouting deep hole (10).

3. A tunnel grouting reinforcement structure according to claim 2, characterized in that: An insertion hole (11) is provided on the outer wall of the deep hole grout pipe (1), a hollow grouting punch (7) is inserted into the insertion hole (11), and a fissure grouting hole (5) is provided at the pointed end of the grouting punch (7).

4. A tunnel grouting reinforcement structure according to claim 3, characterized in that: An impact half hole (6) is provided at the inner end of the grouting punch (7), and the diameter of the impact half hole (6) is smaller than the outer diameter of the central grouting pipe (8).

5. A tunnel grouting reinforcement structure according to claim 3, characterized in that: The insertion hole (11) and the grouting punch (7) are clearance fit or transition fit.

6. A tunnel grouting reinforcement structure according to claim 3, characterized in that: The grouting punch (7) is made of high manganese steel.

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