Combined lining structure based on polyhedral duct pieces for tunnel

Abstract

The invention relates to a combined lining structure based on polyhedral duct pieces for a tunnel. The combined lining structure is formed by combining and assembling a plurality of pieces of hexahedral duct pieces, a plurality of pieces of octahedral duct pieces and a plurality of pieces of decahedral duct pieces into a cylinder shape, so that through seams do not exist in the longitudinal direction and the circumferential direction of the combined lining structure. Compared with the prior art, according to the combined lining structure, obvious weak links do not exist in the lining structure, opening and dislocation deformation among duct piece structures can be reduced, the waterproof capacity of the tunnel lining structure is improved, a complete lining stressed structure ring is formed by the decahedral duct pieces and tetrahedral duct pieces in the tunnel ring direction, a complete lining stressed structure ring is formed by the octahedral duct pieces and the tetrahedral duct pieces at the end part of the tunnel, decahedral or octahedral inclined planes are interacted among the rings to transmit loads, and when local diseases of the tunnel occur, the rings can act together toavoid catastrophic accidents.

Description

technical field [0001] The invention relates to the field of prefabricated segments for tunnels, in particular to a composite lining structure for tunnels based on polyhedral segments. Background technique [0002] With the continuous development of prefabricated assembly technology in underground engineering, especially in the field of shield tunneling. However, the current form of shield tunnel segments is relatively simple, and rectangular segments are mainly used for joint-through or peak-staggered assembly. There are longitudinal and circumferential joints in the through-joint assembly of rectangular segments, which leads to weak joint stiffness, and the disease and water leakage mainly occur at the joint position; while the staggered assembly of rectangular segments avoids longitudinal joints, but the ring At the same time, due to the stress concentration in the transition zone between the segment seam and the segment formed by staggered peak assembly, segment cracks ...

AI Technical Summary

Problems solved by technology

However, at present, the form of shield tunnel segments is relatively simple, and rectangular segments are mainly used for joint-through or peak-staggered assembly

There are longitudinal and circumferential joints in the through-joint assembly of rectangular segments, which leads to weak joint stiffness, and the disease and water leakage mainly occur at the joint position; while the staggered assembly of rectangular segments avoids longitudinal joints, but the ring At the same time, due to the stress concentration in the transition zone between the segment seam and the segment formed by staggered peak assembly, segment cracks often occur at the intersection of the longitudinal seam and the segment. In recent years, some experts and scholars have proposed the use of prefabricated hexagonal (octahedral) segments to construct tunnel lining structures, which are still rarely used. At the same time, there is also the problem of interruption of the force transmission path in the circumferential segment (the end of the segment is directly facing the segment connection). joint), with the continuous increase of the tunnel section and the continuous improvement of construction machinery and equipment, it is urgent to propose a new segment form and a design and construction method for the tunnel lining structure

Images