Shield tunnel segment variable thickness steel ring

Abstract

The invention relates to a shield tunnel segment variable thickness steel ring. The shield tunnel segment variable thickness steel ring is formed by splicing steel sheets; starting from the right above of segments at 0 degree, the degree of the spliced steel sheets is increased clockwise, the areas between 345 degrees and 15 degrees, 60 degrees and 90 degrees, and 270 degrees and 300 degree of thesegments are special areas; areas on both sides of every special area within 10 degrees are gradient areas, and the other areas of the segments are common areas; the thickness of steel ring in the special areas is twice as much as that in the common areas. The shield tunnel segment variable thickness steel ring determine a reasonable and scientific reinforcing steel ring thickness, thereby improving the reinforcing effects and meanwhile reducing consumption of steel ring materials as well as the construction costs; the segments and the steel ring are anchored through expansion bolts, the areas clockwise between 330 degrees and 0 degree, 120 degrees and 150 degrees, and 210 degrees and 240 degrees of the segments serve as reinforced anchoring areas and areas outside the reinforced anchoring areas as common anchoring areas, the segments and the steel ring are anchored through the expansion bolts at an interval of 20 degrees in the reinforced anchoring areas and an interval of 30 degreesin the common anchoring areas, so that the tensile strength of the segments and the steel ring can be enhanced effectively.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, in particular to a steel ring with variable thickness of a shield tunnel segment. Background technique [0002] In recent years, my country's urban rail transit has developed rapidly. The subway shield tunnel is in a certain engineering geological environment. When it is affected by external operations, it will change the stress state of the shield tunnel structure, which may cause the shield tunnel to generate too much. The lateral deformation of the tunnel will cause segment cracking, joint opening, bolt failure and other phenomena, which will induce tunnel damage. Tunnel diseases have brought safety hazards to the normal operation of tunnels, and even caused serious accidents and caused heavy losses. In addition, during the service period of the subway shield tunnel structure, various functions will be weakened with time, and the reliability will be reduced, which will affect the normal...

AI Technical Summary

Problems solved by technology

[0004] However, the current inner steel ring reinforcement methods all use steel rings of equal thickness, and the appropriate thickness of the steel ring is not determined according to the stress characteristics of the tunnel segment, and the reinforcement is not targeted enough.

At the same time, the bonding between the segment and the steel ring only relies on epoxy resin, which is prone to bond failure, slipping and peeling between the segment and the steel ring

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