Elastic longitudinal joint device used for shield tunnel segments in swelling soil areas

Abstract

The invention discloses an elastic longitudinal joint device used for shield tunnel segments in swelling soil areas. The longitudinal joint walls of the segments are provided with rubber belts covering all the longitudinal joint walls; the rubber belt at a sealing groove is positioned between a sealing groove wall and a sealing gasket; the thickness P of the rubber belt is determined by a formulashown in the description; and in the formula, P' is the thickness of the rubber belt compressed under the action of the axial force of a lining structure and is 3 to 8 mm; E2 is the elastic modulus of the rubber belt; N is the axial force acted on the lining structure; and A is the action area of the axial force, and A=bh, wherein b is the length of the longitudinal joint of each segment, and h is the thickness of the segment. The device can greatly reduce the equivalent stiffness of a lining so as to reduce the swelling force acted on the lining and guarantee the safety and reliability of shield tunnel structures built in the swelling soil areas; meanwhile, the device reduces the internal stress of the lining structure, effectively reduces the reinforcement of the lining, and has high waterproof property.

Description

technical field [0001] The invention relates to a structure used for the connection of longitudinal seams of shield tunnel segments, in particular to an elastic longitudinal seam device for shield tunnel segments in expansive rock and soil areas. Background technique [0002] Expansive rock and soil expand and contract with environmental changes, especially changes in humidity state, and generate expansive pressure. The important property of expansive soil is that the clay mineral composition of expansive soil contains more montmorillonite, illite and halloysite. These minerals have a strong ability to combine with water, absorb water, swell, lose water and shrink, and It has the reciprocating expansion and contraction characteristics of expansion-shrinkage-re-expansion, especially the content of montmorillonite directly determines the size of its expansion performance. Expansive rocks and soils expand in volume after soaking in water, and under unconfined conditions, water...

AI Technical Summary

Problems solved by technology

There is very little room for the expansion and contraction of this longitudinal joint device. If such a lining is still used in the expansive rock and soil area, when the swelling of the expansive rock and soil absorbs water and is restrained by the lining, a large expansion force will be generated, which will cause the lining to develop. Large internal force, thus greatly improving the mechanical performance requirements of the lining, although the internal stress can be reduced by increasing the amount of reinforcement, but the cost is too high to achieve

The method of changing the lining structure requires changing the lining template, which is also very expensive and difficult to implement.

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