Water-rich stratum tunnel bottom anti-seepage grouting reinforcement device and construction method thereof

Abstract

This invention relates to the field of tunnel boring machine (TBM) construction technology, specifically disclosing a grouting reinforcement device and construction method for seepage prevention at the bottom of a tunnel in water-rich strata. A wedge-shaped gasket is installed between adjacent TBM segments. Grouting holes are drilled into the tunnel wall from the wedge-shaped gaskets. A grouting pipe is installed within the grouting holes. The grouting pipe includes a base pipe with two half-pipes at its lower end. When the two half-pipes are closed together, they form a circular pipe. The ends of the two half-pipes are hinged together. A central pipe is located inside the base pipe, and a compression ring is located at one end of the central pipe. The compression ring is pushed by the central pipe to move towards the two half-pipes, causing the two half-pipes to separate to both sides around the hinge. The beneficial effects of this invention are: it can simultaneously reinforce the TBM segments internally and externally during seepage prevention construction, enhancing the strength of the soil surrounding the TBM segments and making it less prone to displacement by external forces.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) construction technology, and in particular to a seepage prevention grouting reinforcement device for the bottom of a tunnel in water-rich strata and its construction method. Background Technology

[0002] Water seepage at the bottom is a common and serious problem during tunnel construction in water-rich strata. Current technology involves drilling grouting holes downwards from the tunnel wall and inserting grouting pipes into these holes for reinforcement. This method integrates the concrete grout with the surrounding soil, strengthening the underlying geological structure and thus achieving seepage prevention. However, in actual tunnel construction, [see...] Figure 8 As shown, the tunnel may have curved sections. During the construction of these curved sections, wedge-shaped gaskets 200 need to be filled between adjacent shield segments 100 to achieve a smooth transition. However, during later tunnel use, external forces such as surrounding geological subsidence or vehicles can exert compressive stress on the tunnel. Under this stress, the shield segments 100 in the curved sections are very prone to deformation. This deformation can also cause corresponding deformation in the bottom grouting reinforcement areas, thus reducing the tunnel's seepage prevention capabilities. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a seepage prevention grouting reinforcement device for the bottom of tunnels in water-rich strata.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A seepage prevention and grouting reinforcement device for the bottom of a tunnel in water-rich strata includes a wedge-shaped gasket between adjacent shield tunnel segments, a grouting hole drilled from the wedge-shaped gasket into the tunnel wall, and a grouting pipe installed in the grouting hole. The grouting pipe includes a base pipe with two half-pipes at the lower end. When the two half-pipes are closed together, they form a circular pipe. The ends of the two half-pipes are hinged together. A central pipe is installed inside the base pipe, and a compression ring is installed at one end of the central pipe. The compression ring is pushed by the central pipe to move towards the two half-pipes. The compression ring can cause the two half-pipes to separate to both sides around the hinge.

[0006] Preferably, a half-ring is fixedly connected inside each half-tube, the inner wall of the half-ring is provided with an inclined arc surface, and one end of the extrusion ring is provided with a conical surface, the conical surface being provided in correspondence with the inclined arc surface.

[0007] Preferably, a trapezoidal slide rod is fixedly connected to the upper end of each half-tube, and a trapezoidal groove is provided at the lower end of the base tube, wherein the trapezoidal slide rod can move in all directions within the trapezoidal groove.

[0008] Preferably, grouting pipes along the same path along the tunnel axis are fixed together by an axial plate.

[0009] Preferably, a sealing ring is fitted on the outside of the base pipe, and the sealing ring is fixed between the axial plate and the shield segment corresponding to the base pipe.

[0010] Preferably, the upper end of the base tube is fixed to the axial plate, and an opening is provided on the base tube, with the opening facing the sealing ring.

[0011] Preferably, multiple reinforcing rods are fixedly connected to the inner wall of the sealing ring.

[0012] The present invention also discloses a construction method for a grouting reinforcement device for seepage prevention at the bottom of a tunnel in a water-rich stratum, wherein the above-mentioned grouting reinforcement device is used to carry out seepage prevention construction at the bottom of a tunnel in a water-rich stratum.

[0013] The beneficial effects of the present invention are as follows: The anti-seepage grouting reinforcement device at the bottom of the tunnel in water-rich strata provided by the present invention can reinforce the shield tunnel segments internally and externally while carrying out anti-seepage construction, enhance the strength of the soil around the shield tunnel segments, and prevent the shield tunnel segments from shifting due to external forces. The half-tube moves to the bottom of the shield tunnel segment and effectively supports the shield tunnel segment through the half-tube, further preventing the shield tunnel segments from shifting due to external forces. Attached Figure Description

[0014] Figure 1 This is a basic structural diagram of a seepage prevention grouting reinforcement device for the bottom of a water-rich stratum tunnel provided by the present invention;

[0015] Figure 2 This is a diagram showing the connection structure between the axial plate and the grouting pipe;

[0016] Figure 3 yes Figure 2 Usage diagram;

[0017] Figure 4 This is a structural diagram of the grouting pipe;

[0018] Figure 5 yes Figure 4 Usage diagram;

[0019] Figure 6 This is a diagram showing the connection between the extrusion ring and the semi-ring;

[0020] Figure 7 It is a cross-sectional view of the connection between the grouting pipe, the pipe segment, and the wedge-shaped gasket;

[0021] Figure 8 This is a structural diagram of a curved section of a tunnel in existing technology. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] like Figures 1-7 As shown in this embodiment, a seepage-proof grouting reinforcement device for the bottom of a water-rich stratum tunnel includes a wedge-shaped gasket 200 between adjacent shield segments 100. Grouting holes are drilled into the tunnel wall from the wedge-shaped gasket 200, and grouting pipes 1 are installed inside the grouting holes. The diameter of the grouting hole is larger than the diameter of the grouting pipe 1. The grouting pipes 1 along the same path along the tunnel axis are fixed together by an axial plate 2. A sealing ring 5 is fitted on the outside of the base pipe 10, and the sealing ring 5 is fixed between the axial plate 2 and the shield segment 100 corresponding to the base pipe 10. This arrangement creates a sealed space between the shield segment 100 and the axial plate 2 through the sealing ring 5.

[0024] The grouting pipe 1 includes a base pipe 10, with two half-pipes 11 at the lower end of the base pipe 10. When the two half-pipes 11 are closed together, they form a circular pipe. The upper end of the base pipe 10 is fixed to the axial plate 2, and an opening 19 is provided on the base pipe 10, facing the sealing ring 5. Multiple reinforcing rods 51 are fixedly connected to the inner wall of the sealing ring 5. The ends of the two half-pipes 11 are hinged together by hinges 13. A trapezoidal sliding rod 12 is fixedly connected to the upper end of each half-pipe. A trapezoidal groove is provided at the lower end of the base pipe. The size of the trapezoidal sliding rod 12 is smaller than that of the trapezoidal groove. The trapezoidal sliding rod 12 can move in all directions within the trapezoidal groove and will not fall out of the trapezoidal groove. In this way, the half-pipes 11 and the base pipe 10 can be connected together, and the trapezoidal sliding rod 12 can move in all directions within the trapezoidal groove. When the two half-pipes 11 are separated, the two trapezoidal sliding rods 12 can slide and make way within the trapezoidal groove.

[0025] The base tube 10 is provided with a central tube 3. The base tube 10, the central tube 3 and the half tube 11 are all provided with grout passage holes, which are not shown in the figure. One end of the central tube 3 is provided with a compression ring 4. The upper end of the compression ring 4 is fixedly connected to a threaded tube 41. The central tube 3 is threaded inside the threaded tube 41. Each half tube 11 is fixedly connected with a half ring 6. The inner wall of the half ring 6 is provided with a sloping arc surface 61. One end of the compression ring 4 is provided with a conical surface 42. The conical surface 42 is correspondingly set with the sloping arc surface 61. The bottom of the compression ring 4 is provided with a relief groove 43, which is correspondingly set with the trapezoidal slide rod 12.

[0026] A crossbar 31 is fixedly connected to the central tube 3. The crossbar 31 facilitates pushing the central tube 3. The central tube 3 pushes the compression ring 4 to move between the two half tubes 11. The trapezoidal slide bar 12 extends into the relief groove 43. The relief groove 43 can effectively prevent the compression ring 4 from colliding with the trapezoidal slide bar 12. The conical surface 42 at the front end of the compression ring 4 contacts the inclined arc surface 61 of the inner wall of the half ring 6. The half ring 6 is squeezed by the compression ring 4 and moves to both sides, thereby causing the two half tubes 11 to separate to both sides with the hinge 13 as the center. In this way, the upper ends of the two half tubes 11 are pushed to the bottom of the shield segment 100.

[0027] This embodiment also discloses a construction method for a grouting reinforcement device for seepage prevention at the bottom of a water-rich stratum tunnel. The above-mentioned grouting reinforcement device is used to carry out seepage prevention construction at the bottom of the water-rich stratum tunnel. During construction, the two half-pipes 11 are first closed together to form a circular pipe. Grout is injected into the central pipe 3. The grout flows downward into the surrounding soil. After the grout has not solidified and the lower grouting is completed, the central pipe 3 pushes the squeezing ring 4 to move towards the two half-pipes 11. This causes the two half-pipes 11 to separate to both sides with the hinge 13 as the center. In this way, the upper ends of the two half-pipes 11 are pushed to the bottom of the shield segment 100. At the same time, grouting is continuously carried out. The grout accumulates on the outside of the shield segment 100. Grout is continuously injected until the grout reaches the top of the base pipe 10 and stops. When the grout in the base pipe 10 is higher than the opening 19, the grout enters the sealing ring 5 from the opening 19. After the grout solidifies, a reinforcing block is formed within the sealing ring 5. Simultaneously, the reinforcing block, through the base pipe 10, forms a unified structure with the reinforced soil outside the shield tunnel segment 100. This effectively strengthens the shield tunnel segment 100 from both inside and outside during seepage prevention construction, enhancing the strength of the surrounding soil and making it less prone to displacement by external forces. Furthermore, the axial plate 2 can function as a deformation detection plate during later construction. When the shield tunnel segment 100 shifts, the axial plate 2 will be compressed and bent, allowing for a rough assessment of the displacement. The reinforcing rod 51 on the inner wall of the sealing ring 5 acts as a reinforcing rib, increasing the strength of the reinforcing block formed within the sealing ring 5. After grouting is completed, all components remain in place, simultaneously completing the seepage prevention construction and enhancing the reinforcement effect of the shield tunnel segment 100. The purpose of separating the two half-tubes 11 is to move the half-tubes 11 below the shield tunnel segment 100, so as to effectively support the shield tunnel segment 100 through the half-tubes 11 and prevent the shield tunnel segment 100 from being displaced by external forces.

Claims

1. A grouting reinforcement device for seepage prevention at the bottom of a tunnel in water-rich strata, comprising a wedge-shaped gasket (200) between adjacent shield tunnel segments (100), grouting holes drilled from the wedge-shaped gasket (200) into the tunnel wall, and a grouting pipe (1) installed in the grouting hole, characterized in that: The grouting pipe (1) includes a base pipe (10), and two half-pipes (11) are provided at the lower end of the base pipe (10). When the two half-pipes (11) are closed together, they form a circular pipe. The ends of the two half-pipes (11) are hinged together by a hinge (13). A central pipe (3) is provided inside the base pipe (10). A squeezing ring (4) is provided at one end of the central pipe (3). The squeezing ring (4) is pushed by the central pipe (3) to move towards the two half-pipes (11). The squeezing ring (4) can make the two half-pipes (11) separate to both sides with the hinge (13) as the center. Each of the half-tubes (11) is fixedly connected to a half-ring (6). The inner wall of the half-ring (6) is provided with an inclined arc surface (61). One end of the extrusion ring (4) is provided with a conical surface (42). The conical surface (42) is provided in correspondence with the inclined arc surface (61). The bottom of the extrusion ring (4) is provided with a relief groove (43).

2. The seepage prevention grouting reinforcement device for the bottom of a water-rich stratum tunnel according to claim 1, characterized in that: Each half-tube (11) is fixedly connected to a trapezoidal slide rod (12) at its upper end, and the base tube (10) is provided with a trapezoidal groove at its lower end. The trapezoidal slide rod (12) can move in all directions within the trapezoidal groove.

3. The seepage prevention grouting reinforcement device for the bottom of a water-rich stratum tunnel according to claim 1, characterized in that: The grouting pipes (1) along the same path in the direction of the tunnel axis are fixed together by an axial plate (2).

4. The seepage prevention grouting reinforcement device for the bottom of a water-rich stratum tunnel according to claim 3, characterized in that: A sealing ring (5) is fitted on the outside of the base pipe (10), and the sealing ring (5) is fixed between the axial plate (2) and the shield segment (100) corresponding to the base pipe (10).

5. The seepage prevention grouting reinforcement device for the bottom of a water-rich stratum tunnel according to claim 4, characterized in that: The upper end of the base tube (10) is fixed to the axial plate (2), and an opening (19) is provided on the base tube (10), which is oriented toward the sealing ring (5).

6. The seepage prevention grouting reinforcement device for the bottom of a water-rich stratum tunnel according to claim 4, characterized in that: Multiple reinforcing rods (51) are fixedly connected to the inner wall of the sealing ring (5).

7. A construction method for a seepage prevention grouting reinforcement device at the bottom of a tunnel in water-rich strata, characterized in that: The anti-seepage grouting reinforcement device for the bottom of a water-rich stratum tunnel, as described in any one of claims 1-6, is used for anti-seepage construction at the bottom of the tunnel.

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