Tunnel pipe section lining structure formed by annularly and alternatively splicing octagonal and quadrilateral pipe sections

Abstract

The invention discloses a tunnel pipe section lining structure formed by annularly and alternatively splicing octagonal and quadrilateral pipe sections. The tunnel pipe section lining structure comprises quadrilateral pipe sections and octagonal pipe sections, wherein two sides of each octagonal pipe section are two long edges; isosceles trapezoids without bottom edges are formed at edges of two ends of the octagonal pipe sections; two side faces at two sides of each octagonal pipe section are used for being connected with long end faces at two sides of the adjacent quadrilateral pipe section respectively; four inclined end faces of the two ends of each octagonal pipe section are used for being connected with inclined end faces of the two ends of the other octagonal pipe sections respectively; and front end faces of the two ends of each octagonal pipe section are used for being connected with short end faces of the two ends of the adjacent quadrilateral pipe section respectively. The pipe section lining structure which has a specific structure and combines the octagonal pipe sections and the quadrilateral pipe sections is adopted, so that the aim that tunneling of a tunnel boring machine and rapid splicing of the pipe sections can be carried out at the same time can be realized and the construction efficiency is remarkably improved; and the whole rigidity of a spiced tunnel pipe section lining is obviously enhanced, and the types of templates for prefabricating the pipe sections are relatively few.

Description

technical field [0001] The invention relates to a tunnel segment lining structure, in particular to a tunnel segment lining structure in which octagonal and quadrilateral segments are assembled alternately in the circumferential direction. Background technique [0002] The shield method relies on the shield tail jack to push on the assembled prefabricated segment ring, and the cutter head in front of the shield rotates to cut the soil to achieve advancement, and at the same time, a new ring of prefabricated segment assembly is implemented under the protection of the shield shell And finally form a mechanized construction method of shield tunnel structure. Because the shield method has the advantages of high degree of mechanization and small ground disturbance, it has become the main method for the construction of underground projects such as urban subway tunnels and cross-river and sea tunnels. [0003] At present, the domestic shield construction mainly adopts the quadrila...

AI Technical Summary

Problems solved by technology

The joint surface between the segment ring and the ring assembled by quadrilateral segments with the same width is usually a plane, because the segment cannot provide reaction force for the jacking jack during the assembling process, so this quadrangle The segment lining structure requires that the segments cannot be assembled during the tunneling construction of the shield, and the excavation construction cannot be performed when the segments are assembled, that is, the excavation and assembly cannot be carried out at the same time, which seriously restricts the efficiency of the shield construction

At the same time, although the existing quadrilateral segment lining structure can realize staggered seam assembly in the longitudinal direction to prevent the penetration of the longitudinal seam, it cannot change the connectivity of the interannulus seam between the rings, which is not conducive to improving the overall quality of the tunnel. Rigidity, the structural deformation is large in soft ground, and the overall stability is not high

Since most of the existing quadrilateral segments are connected by bolts through hand holes, it is difficult to meet the requirements of continuous synchronous propulsion and assembly for high efficiency

In addition, the existing set of molds for quadrilateral segment lining on the straight line section mainly includes four types of templates, including a capping block, two adjacent blocks and a standard block. There are many types of templates, and the cost of purchasing molds is relatively high. , when the segments are assembled, the various segment types need to be numbered to prevent transportation and assembly confusion

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