Waterproof method for seams of high-water-pressure small-section shield tunnel

Abstract

The invention relates to a waterproof method for seams of a high-water-pressure small-section shield tunnel. The waterproof method comprises the following steps: arranging a seam waterproof structure at a ring seam of a tube piece; determining seam waterproof designed pressure P0; determining maximum open amount of the seam of the tube piece and maximum staggered joint amount and closed compression force of the tube piece; setting a hole pattern structure, hole size, hole number and hole arrangement of an elastic sealing gasket and the section size of the elastic sealing gasket; carrying out waterproof performance test of the seam of the tube piece, and testing whether sealing and waterproofness of the seam meet requirements or not; if sealing and waterproofness of the seam meet the requirements, finishing waterproofness of the seam; and if sealing and waterproofness of the seam do not meet requirements, and returning to adjust parameters of the elastic sealing gasket. By the waterproof method, the problems that in the prior art, the design is inaccurate, the basis is not enough, and the schedule of the process cannot be followed up can be solved, and series of problems of material selection is lack of guidance, delivery-receiving acceptance of the project is not facilitated and the like are also solved.

Description

technical field [0001] The invention relates to a waterproof method for joints of shield tunnels with high water pressure and small cross-section, belonging to the field of waterproofing of shield tunnels for oil and gas pipelines. Background technique [0002] Oil and gas pipeline shield tunnel is an important carrier for oil and gas pipelines to cross rivers and waters. Since there are a large number of longitudinal and annular joints between the shield tunnel segments and between the segment rings, with the increasingly complex environment of the tunnel and the emergence of high water pressure or even ultra-high water pressure tunnels, the joints of the tunnel segments are waterproof Design is becoming more and more important. In the past, the waterproof design of small-section shield engineering only proposed a secondary waterproof requirement, and the joint waterproof design pressure, sealing groove, sealing structure, sealing material performance and service life were...

AI Technical Summary

Problems solved by technology

In the past, the waterproof design of small-section shield engineering only proposed a secondary waterproof requirement, and the joint waterproof design pressure, sealing groove, sealing structure, sealing material performance and service life were not analyzed and reflected in the joint waterproof design

In addition, due to the small section of the oil and gas pipeline shield, the installation stress requirements are also small, the construction and installation errors are correspondingly small, and the stability is relatively good. It is unreasonable and economical to blindly refer to the joint sealing and waterproof design of large-section shield tunnels.

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