Tunnel portal structure passing through mining method tunnel by shield top tunneling

Abstract

The invention discloses a tunnel portal structure passing through a mining method tunnel by shield top tunneling. The tunnel portal structure is arranged at a junction of the mining method tunnel anda shield top tunneled tunnel. The tunnel portal structure comprises a tunnel portal steel ring and a tunnel portal sealing device. The bottom of the tunnel portal steel ring is pre-buried in a concrete receiving strip beam poured at the bottom of the mining method tunnel, the side edge of the tunnel portal steel ring is connected to an initial supporting steel frame of the tunnel and concrete is sprayed to fix the tunnel portal steel ring, and the top of the tunnel portal steel ring is connected and fixed to a steel frame o the top of the tunnel through a reinforcing steel bar mesh and concrete is sprayed to close an arch crown area. The tunnel portal structure and the initial supporting structure of the mining method tunnel form an integral stress system, so that a condition that follow-up construction is affected as the tunnel portal structure is damaged in a process that a rectangular shield top tunneling machine goes out of the tunnel is prevented effectively. The tunnel portal structure reduces various mud and underwater swarming into the mining method tunnel in the process that the rectangular shield top tunneling machine enters into the mining method tunnel obviously, thereby providing conditions for follow-up construction.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a portal structure of a rectangular shield top excavated through a mining method tunnel. Background technique [0002] Rectangular shield top excavation construction technology is a new type of non-excavation construction technology. The rectangular shield top excavation machine is used to excavate in the ground, and the pipe joints enter the ground together with the top excavation machine to form the main structure of the tunnel. [0003] Under normal circumstances, the covering depth of rectangular shield top excavation tunnels is not large, usually about 5-8m. During the construction process, it is often necessary to pass through various municipal pipelines at close range. When encountering municipal pipelines with deep buried depths and large pipe diameters At this stage, due to the limited torque of the cutter head of the rectangular shield tunnelin...

AI Technical Summary

Problems solved by technology

[0003] Under normal circumstances, the covering depth of rectangular shield top excavation tunnels is not large, usually about 5-8m. During the construction process, it is often necessary to pass through various municipal pipelines at close range. When encountering municipal pipelines with deep buried depths and large pipe diameters At this stage, due to the limited torque of the cutter head of the rectangular shield tunneling machine at the present stage, it is impossible to rely on the tunneling machine itself to eliminate pipeline obstacles

Images