A self-damage type anti-seismic structure of an integrated pipe gallery shield tunnel inter-ring joint

Abstract

The application provides a self-damage type anti-seismic structure for a comprehensive pipe gallery shield tunnel ring joint, one side of two shield segments is a joint surface, waterproof grooves are arranged on the corresponding positions of the one side of the two shield segments; the shield segment is provided with a hand hole and a reserved bolt hole connected with the hand hole, the reserved bolt hole is also connected with the joint surface; a bolt is fixed by penetrating the reserved bolt holes of the two shield segments, and a gasket is arranged between the bolt and the inner wall of the hand hole; a placement space of the self-damage type anti-seismic structure is located below the joint surface, and the upper side of the placement space is provided with an arc-shaped outer contour; the self-damage type anti-seismic structure comprises a high-strength cutting knife, a spring, a concave sliding block and a convex sliding block; the concave sliding block and the convex sliding block are fixed on the two shield segments by a fixing bolt, and the concave sliding block and the convex sliding block are in frictional contact; a steel pad is fixed above the concave sliding block, the spring is fixed above the steel pad, and the high-strength cutting knife is fixed above the spring.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underground engineering, and relates to a shield tunnel anti-seismic technology, in particular to a self-damage type anti-seismic structure of an inter-ring joint of a comprehensive pipe gallery shield tunnel. BACKGROUND

[0002] As one of the main structural forms of the urban comprehensive pipe gallery, the safety of the shield tunnel is increasingly valued. The special joint structure of the shield tunnel makes its seismic response characteristics quite different from those of the mountain tunnel. The urban comprehensive pipe gallery is often located in the urban soft soil, and the stratum deformation is large under the action of the earthquake, so the anti-seismic performance of the urban comprehensive pipe gallery shield tunnel needs to be specially considered.

[0003] The shield tunnel is first assembled into a segment ring by bolts between segments, and then assembled into a longitudinal whole structure by bolts between segment rings. The "segment-bolt" connecting structure between the segment rings is generally referred to as an inter-ring joint. Under the action of the cyclic reciprocating earthquake load, the inter-ring joint is in a cyclic tension-compression deformation mode. Since the concrete is resistant to compression but not resistant to tension, when the inter-ring joint is opened, the shield tunnel structure tends to be dangerous. When the urban comprehensive pipe gallery shield tunnel adopts large-diameter segments, large-diameter inter-ring bolts follow. Existing studies show that when the bolt diameter is large and the inter-ring joint is greatly opened under the action of the earthquake, the segment is damaged before the bolt, at which time the shield tunnel loses the bearing capacity. Therefore, the method for protecting the shield segment and maintaining the bearing capacity of the shield tunnel when the urban comprehensive pipe gallery shield tunnel adopts large-diameter inter-ring bolts needs to be researched. SUMMARY

[0004] The main technical problem to be solved by the application is to provide a self-damage type anti-seismic structure of an inter-ring joint of a comprehensive pipe gallery shield tunnel, which protects the shield segment and maintains the bearing capacity of the shield tunnel.

[0005] In order to solve the above technical problem, the application provides a self-damage type anti-seismic structure of an inter-ring joint of a comprehensive pipe gallery shield tunnel, which comprises a shield segment and a self-damage type anti-seismic structure.

[0006] One side of the two shield segments facing each other is a joint surface, waterproof grooves are arranged on the corresponding positions of the one side of the two shield segments facing each other respectively, and waterproof gaskets are placed in the waterproof grooves; the shield segment is provided with a hand hole and a reserved bolt hole communicating with the hand hole, and the reserved bolt hole also communicates with the joint surface; a bolt is fixed by penetrating the reserved bolt holes of the two shield segments, and a gasket is arranged between the bolt and the inner wall of the hand hole.

[0007] The placement space of the self-damage type anti-seismic structure is located below the joint surface, and the upper side of the placement space is provided with an arc-shaped outer contour; the self-damage type anti-seismic structure comprises a high-strength cutting knife, a spring, a concave sliding block and a convex sliding block; the concave sliding block and the convex sliding block are fixed on two shield segments by a fixing bolt, and the concave sliding block and the convex sliding block are in frictional contact;

[0008] The upper side of the concave sliding block is fixed with a steel pad, the upper side of the steel pad is fixed with the spring, and the upper side of the spring is fixed with the high-strength cutting knife.

[0009] In a preferred embodiment, a waterproof groove is arranged above the joint surface, and a waterproof gasket is arranged in the waterproof groove.

[0010] In a preferred embodiment, the length of the concave sliding block reaches two adjacent shield segments, and the overlapping length of the concave sliding block and the convex sliding block is greater than the maximum opening amount of the joint.

[0011] In a preferred embodiment, the length of the spring without deformation is much greater than the assembly distance of the high-strength cutting knife and the steel pad.

[0012] In a preferred embodiment, the left side of the spring is flush with the joint surface, and the upper side of the spring abuts against the arc-shaped outer contour.

[0013] In a preferred embodiment, the thickness of the high-strength cutting knife is less than the opening amount when the inter-ring joint is opened and damaged.

[0014] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0015] The device does not affect the existing structure of the shield tunnel and does not affect the preparation and assembly of the segments. The device only needs to be installed on site after the assembly of the segments is completed. The device does not affect the normal operation of the shield tunnel. During an earthquake, when the inter-ring joint is opened slightly and does not affect the safety of the segments, the high-strength cutting knife cannot be squeezed into the joint surface, and the device will not work. When the inter-ring joint is opened greatly and the segments have a risk of damage, sufficient deformation space appears above the high-strength cutting knife, the high-strength cutting knife slides into the opening area of the joint through the arc-shaped outer contour, the compressed spring is elongated, the high-strength cutting knife cuts the bolt under the action of the spring, causing pre-damage and stress concentration of the bolt, so that the bolt is preferentially damaged. After the earthquake, the damaged bolt is removed, and a new bolt is installed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is an inter-ring joint of a shield tunnel in a normal operation state;

[0017] Figure 2 is an inter-ring joint of a shield tunnel near failure under high-intensity earthquake conditions;

[0018] Figure 3is a schematic diagram of a self-damaging anti-seismic structure;

[0019] Figure 4 is a schematic diagram of three states of a bolt (normal state, cutting damage state, stress concentration and crack propagation condition under fracture state). DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings; obviously, the described embodiments are only part of the embodiments of the present application, and not all the embodiments; based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood in a broad sense; for example, "connected" can be wall-mounted connection, can be detachable connection, or can be integrally connected; can be mechanical connection, can be electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the communication between two elements; for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] Reference Figures 1-4 The embodiment provides a comprehensive pipe gallery shield tunnel ring joint self-damaging anti-seismic structure, which comprises a shield segment 1 and a self-damaging anti-seismic structure 9.

[0023] The side of the two shield segments 1 facing each other is a joint surface 8, waterproof grooves 2 are arranged on the side of the two shield segments 1 facing each other at corresponding positions respectively, and waterproof gaskets 3 are placed in the waterproof grooves 2; the shield segment 1 is provided with a hand hole 4 and a reserved bolt hole 7 communicating with the hand hole 4, and the reserved bolt hole 7 also communicates to the joint surface 8 of the shield segment 1; a bolt 5 is fixed by penetrating the reserved bolt holes 7 of the two shield segments 1, and a gasket 6 is arranged between the bolt 5 and the inner wall of the hand hole 4;

[0024] The placement space 9-1 of the self-damaging anti-seismic structure 9 is located below the joint surface 8, and the upper side of the placement space 9-1 is provided with an arc-shaped outer contour 9-2; the self-damaging anti-seismic structure 9 comprises a high-strength cutting knife 9-3, a spring 9-4, a concave sliding block 9-6 and a convex sliding block 9-7; the concave sliding block 9-6 and the convex sliding block 9-7 are fixed on the two shield segments 1 by a fixed bolt 9-9, and the concave sliding block 9-6 and the convex sliding block 9-7 are in frictional contact;

[0025] The upper part of the concave sliding block 9-6 is fixed with a steel pad 9-5, the upper part of the steel pad 9-5 is fixed with a spring 9-4, and the upper part of the spring 9-4 is fixed with a high-strength cutting knife 9-3.

[0026] In this embodiment, a waterproof groove 2 is arranged above the joint surface, and a waterproof lining 3 is placed in the waterproof groove 2. The length of the concave sliding block 9-6 reaches two adjacent shield segments 1, and the overlapping length of the concave sliding block 9-6 and the convex sliding block 9-7 is greater than the maximum opening amount of the joint. When the spring 9-4 is not deformed, the length is much greater than the assembly distance of the high-strength cutting knife 9-3 and the steel pad 9-5. The left side of the spring 9-4 is flush with the joint surface 8, and the upper part of the spring 9-4 abuts against the arc-shaped outer contour 9-2. The thickness of the high-strength cutting knife 9-3 is less than the opening amount when the inter-ring joint is opened and damaged.

[0027] The specific construction method of the above-mentioned comprehensive pipe gallery shield tunnel inter-ring joint self-damage type anti-seismic structure is as follows:

[0028] (1) Prepare the shield segment 1, waterproof lining 3, bolt 5, and washer 6;

[0029] (2) Place the waterproof lining 3 in the waterproof groove 2, assemble the shield segment 1, assemble the bolt 5 and the washer 6, and apply a pre-tightening force to the bolt 5;

[0030] (3) sequentially fix the high-strength cutting knife 9-3, the spring 9-4, and the steel pad 9-5 together, and fix the steel pad 9-5 on the concave sliding block 9-6;

[0031] (4) assemble the concave sliding block 9-6 and the convex sliding block 9-7 together, place the above structure at the placement space 9-1 below the segment 1 and the joint surface 8, and compress the spring 9-4. Adjust the positions of the concave sliding block 9-6 and the convex sliding block 9-7 so that the left side of the spring 9-4 is flush with the joint surface 8;

[0032] (5) fix the concave sliding block 9-6 and the convex sliding block 9-7 on the segment 1 by using the fixing bolt 9-9;

[0033] (6) the shield tunnel enters a normal operation state;

[0034] (7) strong earthquake strikes, the high-strength cutting knife 9-3 cuts the bolt 5, and the bolt 5 is damaged;

[0035] (8) after the earthquake, remove the damaged bolt 5 and the triggered self-damage type anti-seismic structure 9, reinstall the bolt 5 and apply a pre-tightening force, pull the shield segment 1 back to the original position, and reassemble the self-damage type anti-seismic structure 9.

[0036] The above description is only the preferred specific implementation of the present application, and does not limit the patent scope of the present application. Any technical equivalent transformation made by using the content of the present application description is within the protection scope of the present application.

Claims

1. A self-damage seismic structure of a utility tunnel shield tunnel inter-ring joint, characterized in that The shield segment and the self-damage type anti-seismic structure are included; The two shield segments are provided with waterproof grooves on the side of the joint surface, and waterproof pads are placed in the waterproof grooves; the shield segments are provided with hand holes and reserved bolt holes connected with the hand holes, and the reserved bolt holes are also connected with the joint surface; the bolts are fixed by penetrating the reserved bolt holes of the two shield segments, and the gaskets are arranged between the bolts and the inner walls of the hand holes; The self-damage type anti-seismic structure is placed in the space below the joint surface, and the upper side of the space is provided with an arc-shaped outer contour; the self-damage type anti-seismic structure includes a high-strength cutting knife, a spring, a concave sliding block and a convex sliding block; the concave sliding block and the convex sliding block are fixed on the two shield segments by the fixing bolts, and the concave sliding block and the convex sliding block are in frictional contact; The upper side of the concave sliding block is fixed with a steel pad, the upper side of the steel pad is fixed with the spring, and the upper side of the spring is fixed with the high-strength cutting knife; The length of the spring without deformation is much greater than the assembly distance of the high-strength cutting knife and the steel pad; the left side of the spring is flush with the joint surface, and the upper side of the spring abuts against the arc-shaped outer contour; the thickness of the high-strength cutting knife is less than the opening amount when the ring-to-ring joint is opened and damaged.

2. The self-damaging seismic resistant structure of the utility tunnel shield tunnel inter-ring joint according to claim 1, characterized in that: The waterproof grooves are arranged above the joint surface, and the waterproof pads are placed in the waterproof grooves.

3. The self-damaging seismic-resistance structure of the utility tunnel shield tunnel inter-ring joint according to claim 1, characterized in that: The length of the concave sliding block reaches the two adjacent shield segments, and the overlapping length of the concave sliding block and the convex sliding block is greater than the maximum opening amount of the joint.

Images