Excavation Method of Circumferential Variable Cross-section of Tunnel

Abstract

The invention discloses a circumferential variable-cross-section expanding excavation method of a tunnel. After a steel supporting frame, a counter-force frame and a circumferential expanding excavation shielding mechanism are installed in an initial working well, an ejection device can drive the circumferential expanding excavation shielding mechanism to perform circumferential tunneling, and under the cooperation of a duct piece splicing mechanism, a control device, a hydraulic transmission device, a cinder discharging mechanism and other back-up systems, radial expanding excavation work ofa first ring of the original tunnel is completed; then, a steel pipe-arch frame supporting structure is erected at the position, adjacent to an area for circumferential expanding excavation, of one side of an initial expanding excavation space, soil body excavation work making a cross section gradually expanded and reinforced concrete lining are constructed in the area for circumferential expanding excavation starting from the side, located at a steel arch frame, of the area for circumferential expanding excavation, finally a horn-shaped variable-cross-section segment is formed in area for circumferential expanding excavation, the circumferential variable-cross-section expanding excavation of the tunnel is completed, and in the whole circumferential variable-cross-section expanding excavation process, no ground space is occupied, traffic is not hampered, and ground buildings are not damaged.

Description

technical field [0001] The invention relates to the technical field of tunnel expansion and excavation, in particular to a method for expanding excavation with variable cross-section in the circumferential direction of a tunnel. Background technique [0002] At present, a large number of large and medium-sized cities build underground traffic tunnels (such as highways or subways, etc.). Among them, the variable cross-section section of the underground traffic tunnel (the lane gradually becomes wider, such as the entrance and exit of the highway ramp or the entrance and exit of the subway depot) is the difficulty and focus of the construction of the underground traffic tunnel. Excavation and construction are carried out on the basis of equal-diameter tunnels constructed by institutions. The excavation and construction methods of the variable section section of the traditional traffic tunnel include the open cut method, the cover excavation method, and the mine method. But a...

AI Technical Summary

Problems solved by technology

However, the above-mentioned construction methods will have a certain impact on ground traffic and buildings, and some (such as open and cut methods) also need to occupy a large amount of ground space

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