Bolt hole waterproof structure of high-water-head shield tunnel segment

Abstract

The invention relates to a bolt hole waterproof structure of a high-water-head shield tunnel segment. The bolt hole waterproof structure comprises a segment I, a segment II, a bolt hole and a bolt, wherein the segment I and the segment II are adjacent to each other, the bolt hole communicates with the segment I and the segment II, and the bolt is inserted into the bolt hole. The bolt hole waterproof structure is characterized in that the bolt hole is prefabricated into a circular-truncated-cone-shaped waterproof groove with the small inside and the large outside in the joint position of the segment I and the segment II; the inner diameter of the annular surface of the small-opening end of the waterproof groove is equal to the diameter of the bolt hole; and the waterproof groove of the segment I is tightly bonded with one end of a spindle-like bolt rubber pad with the large middle and the two small ends, the other end of the bolt rubber pad is tightly embedded in the waterproof groove of the segment I, and the bolt penetrates through a through hole of the bolt rubber pad. According to the waterproof structure, the waterproof performance of a high-water-head shield tunnel can be effectively improved, the safe operation of the shield tunnel is preferably guaranteed, and the waterproof structure has the advantages of convenience in installation and the simple structure.

Description

technical field [0001] The invention relates to a bolt hole waterproof structure of a shield tunnel segment. Background technique [0002] In recent years, my country's urban rail transit network has been continuously improved, and the construction of subway tunnels is very hot. Due to the advantages of high degree of mechanization, fast construction and low environmental impact, the shield tunneling method is widely used in today's subway tunnel engineering. The lining structure of the shield tunnel formed by the shield tunneling method is that arc-shaped segments are spliced ​​circumferentially by bolts to form segment rings, and the segment rings are then longitudinally spliced ​​by inter-ring bolts to form the tunnel lining. Therefore, no matter whether the shield tunnel is circumferential or longitudinal, there are joints between segments; and there are gaps between bolts and bolt holes. The shield tunnel is buried in the ground and surrounded by groundwater. The join...

AI Technical Summary

Problems solved by technology

However, due to the small size and thin thickness of the waterproof gasket, its waterproof performance is far lower than that of the two gaskets; and during the bolt connection and assembly process of the segment, the gasket is easily damaged by the dynamic friction and dynamic pressure when the nut is torsion

However, the shield tunnel with high water head bears high water pressure, and the outer waterproof gasket is prone to failure; once the outer waterproof gasket of the segment fails, the water flow on the outside of the tunnel passes through the joints, and then passes through the gap between the bolt holes and the bolts, and flows in the tunnel. Leakage occurs inside, so that the inner waterproof gasket of the segment cannot play its proper waterproof function, resulting in poor waterproof performance of the tunnel

The gap between the bolt hole and the bolt can also be blocked by grouting, but the operation is cumbersome, and the waterproof effect must be achieved after the grouting is completed. The water seepage before the grouting will hinder the construction operation and affect the shield tunnel. Construction progress; and the anti-seepage performance of the cured slurry (concrete) needs to be improved, and the waterproof effect of the tunnel is poor

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