A waterproof structure for bolt holes of shield tunnel segments with high water head

Abstract

A bolt hole waterproof structure of a high-head shield tunnel segment, comprising adjacent segment one and segment two, bolt holes connecting segment one and segment two, and bolts inserted into the bolt holes, characterized in that: The bolt hole is prefabricated into a truncated conical waterproof groove with a small inside and a large outside at the joint of the segment one and the segment two; the inner diameter of the annular surface of the small mouth end of the waterproof groove is the diameter of the bolt hole; The waterproof groove of the segment 1 is tightly bonded to one end of the spindle-like bolt rubber pad with the large and small ends in the middle, and the other end of the bolt rubber pad is tightly embedded in the waterproof groove of the segment 1, and the bolt passes through the bolt rubber Pad for vias. The waterproof structure can effectively improve the waterproof performance of the high-head shield tunnel, better ensure the safe operation of the shield tunnel, and is easy to install and simple in 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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