Inclined bolt hole waterproof structure of high-water-head shield tunnel segment

Abstract

The invention relates to an inclined bolt hole waterproof structure of a high-water-head shield tunnel segment. The inclined bolt hole waterproof structure is characterized in that the socket section of an inclined bolt hole is prefabricated into an inward concave waterproof groove I in the joint position of a segment I; the waterproof groove I is in a circular-truncated-cone shape with the large outside and the small inside, and the bottom surface, which is close to the inner side, of the waterproof groove I is a curved surface in a half-water-drop shape; the straight-through section of the inclined bolt hole is prefabricated into an inward concave waterproof groove II in the joint position of a segment II; the waterproof groove II is in a circular-truncated-cone shape with the large outside and the small inside, and the bottom surface, which is close to the inner side, of the waterproof groove II is a plane; and the waterproof groove I is tightly bonded with one side of a bolt rubber pad, the other side of the bolt rubber pad is tightly embedded in the waterproof groove II of the segment II, and the inclined 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 and reliable operation of the shield tunnel can be preferably guaranteed, and the waterproof structure has the advantages of the simple structure and convenience in installation.

Description

technical field [0001] The invention relates to a waterproof structure for oblique bolt holes 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 has been booming. Due to the advantages of high degree of mechanization, fast construction and low environmental impact, shield tunnels are widely used in today's subway tunnel projects. The lining structure of the shield tunnel is formed by splicing arc-shaped segments along the circumferential direction through bolts to form segment rings, and the segment rings are then spliced ​​longitudinally by inter-ring bolts to form the tunnel lining. Therefore, there are joints between the circumferential and longitudinal segments of the shield tunnel; and there are gaps between the bolts and the oblique bolt holes. The shield tunnel is buried underground and surrounded by groundwater. The seams and gaps i...

AI Technical Summary

Problems solved by technology

However, its 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 construction progress of the shield tunnel; and the concrete formed after the grout is solidified needs to be improved. Poor waterproofing of tunnels

For the waterproof treatment of the slanted bolt holes, waterproof gaskets can also be installed at the nuts at the ends of the slanted bolts to waterproof the slanted bolt holes; however, due to the small size and thin thickness of the waterproof gaskets, their waterproof ability is much lower than that of the two seals. The waterproof performance of the gasket; 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, shield tunnels with high water head are subjected to high water pressure, and the waterproof gasket of the outer channel is prone to waterproof failure due to factors such as segment construction errors; once the waterproof gasket of the outer channel fails, the water flow outside the tunnel passes through the joints and then through the oblique bolt holes The gap between the socket section and the bolt leaks into the tunnel, so that the inner waterproof gasket of the segment cannot play its proper waterproof function, resulting in poor waterproof performance of the tunnel

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