Segment structure applicable to quasi-rectangular shield tunnels

Abstract

The invention relates to a segment structure applicable to quasi-rectangular shield tunnels. The segment structure with the cross section being quasi-rectangular comprises an arch bottom arc section located at the arch bottom of the cross section, an arch crown arc section located at the arch crown of the cross section and two arch haunch arc sections located at the arch haunch positions on two sides of the cross section; the arch haunch arc sections are equal in radius which is smaller than the radius of the arch bottom arc section and the radius of the arch crown arc section; the arch bottom arc section is connected with both the arch haunch arc sections in smooth tangency, and the arch crown arc section is connected with both the arch haunch arc sections in smooth tangency. The segment structure has good arching effect, bending moment and eccentricity upon lining segments are reduced favorably, reinforcement consumption and lining thickness needed are reduced, and corresponding soil excavation volume and concrete consumption are less. In addition, shield equipment can cut soil mass on the whole section beneficially, and impact on surroundings is smaller.

Description

technical field [0001] The invention relates to the field of tunnel shield technology, in particular to a segment structure suitable for rectangular shield tunnels. Background technique [0002] In tunnel shielding, the current conventional tunnel sections are generally divided into single-hole single-line tunnels and single-hole-line double-line tunnels. Among them, single-hole single-line tunnels include small-diameter circular tunnels, and single-hole double-line tunnels include large-diameter circular tunnels. Double circular tunnel and rectangular tunnel. [0003] However, the line spacing of the double-line tunnel of the small-diameter circular tunnel is relatively large, the distance from the tunnel to the building is also large, the underground space occupied by the tunnel is also large, and the impact of shield tunneling on surrounding buildings is relatively large. Two tunnels need to be excavated at the same time, and the construction period is long. The excavat...

AI Technical Summary

Problems solved by technology

There are seagull-shaped grooves on the top of the double-circular tunnel, and the soil is not easy to stabilize, which is not conducive to the construction control of surface settlement. The deflection correction of the shield will aggravate the disturbance of the soil here, and it is easy to produce back soil to cause the surface to bulge. The construction control of the surface settlement extremely difficult

Secondly, the synchronous grouting holes of the double-circle tunnel are set at the upper and lower grooves of the center of the shield, and the path for the grout to fill the gap in the rear of the double-circle shield is relatively long. Failure to fill building voids in time will eventually lead to large ground deformation

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