Stress-compensation waterproof elastic sealing gaskets for shield tunnel segment joint

A shield tunnel segment and elastic sealing pad technology is applied in tunnels, tunnel linings, wellbore linings, etc., which can solve the problems of insufficient rubber recovery and deformation capacity, stress relaxation, and reduced waterproof capacity of sealing pads, and achieve long-term load holding capacity. Strong, overcoming stress relaxation effect

Pending Publication Date: 2018-07-27
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under the action of long-term compressive stress, the gasket is prone to stress relaxation, and the rubber has insufficient ability to recover and deform after the hole collapses, thereby reducing the waterproof ability of the gasket.

Method used

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  • Stress-compensation waterproof elastic sealing gaskets for shield tunnel segment joint
  • Stress-compensation waterproof elastic sealing gaskets for shield tunnel segment joint
  • Stress-compensation waterproof elastic sealing gaskets for shield tunnel segment joint

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing and embodiment example, the present invention will be further described:

[0029] The figure includes: traditional gasket 1, elastic gasket 2, traditional gasket body 3, traditional gasket through hole 4, EPDM rubber waterproof body 5, CM sponge filling body 6, segment 7, segment waterproof insert Slot 8.

[0030] As shown in the drawings, a shield tunnel segment seam waterproof elastic gasket 2 is composed of EPDM rubber waterproof body 5 and CM sponge filling body 6 .

[0031] Before the shield segment 7 is assembled, the elastic gasket 2 is pasted in the segment waterproof groove 8, and after the segment 7 is spliced, two adjacent elastic gaskets 2 are squeezed against each other, so that the gasket 2 is compressed and deformed. The EPDM waterproof body 5 can generate contact stress after being compressed and deformed, so that two adjacent gaskets 2 and the gasket 2 and the concrete segment 7 can fit each other, thereby...

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Abstract

The invention discloses stress-compensation waterproof elastic sealing gaskets for a shield tunnel segment joint. Each waterproof elastic sealing gasket comprises a sealing gasket main body, and is characterized in that each sealing gasket main body is an ethylene-propylene-diene monomer waterproof body, each ethylene-propylene-diene monomer waterproof body is internally provided with a pluralityof holes, and the holes are filled with CM sponge filling bodies. Before shield segments are spliced, the elastic sealing gaskets are pasted into segment waterproof embedding grooves. After the segments are spliced, the two adjacent elastic gaskets mutually extrude each other to cause compression deformation of the gaskets. The ethylene-propylene- diene monomer waterproof bodies can generate contact stress after being compressed and deformed, the two adjacent sealing gaskets are mutually attached and the sealing gaskets and the concrete are mutually attached so as to produce a waterproof sealing effect; and the CM sponge filling bodies generate internal expansion force to the ethylene-propylene- diene monomer waterproof bodies after being compressed and deformed, and the stress relaxationof the ethylene-propylene- diene monomer waterproof bodies under long-term pressure is compensated to ensure the long-term waterproof performance of the elastic sealing gaskets.

Description

technical field [0001] The invention belongs to the field of shield tunnel engineering, and in particular relates to a stress compensation type shield tunnel segment seam waterproof elastic gasket. Background technique [0002] At present, in the field of engineering technology, single-component EPDM rubber (inner through-hole) gaskets or EPDM rubber (inner through-hole) gaskets lapped with water-swellable rubber on the top are mostly used for waterproofing of segment joints. Its waterproof mechanism is as follows: EPDM itself is an incompressible elastic material. When the segments are spliced, several through holes inside are compressed and collapsed, relying on the resilience of EPDM to generate contact stress to resist Water pressure, play a waterproof role. The disadvantages of this gasket are: [0003] Under the action of long-term compressive stress, the gasket is prone to stress relaxation, and the rubber has insufficient ability to recover and deform after the hol...

Claims

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Application Information

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IPC IPC(8): E21D11/38
CPCE21D11/386
Inventor 张亚洲温竹茵由广明刘念高卫平孙双篪沈奕刘建槟
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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