Door type composite pipe roof umbrella arch structure for tunnel opening and construction method thereof

Abstract

The invention discloses a door type composite pipe roof umbrella arch structure for a tunnel opening and a construction method thereof. The structure comprises a pipe roof umbrella arch positioned on the top part of the tunnel opening and pre-reinforced piles positioned on the two sides of the tunnel opening; the pipe roof umbrella arch is connected with the pre-reinforced piles and supported by the pre-reinforced piles; the top ends of the pre-reinforced piles are fixedly connected with a top cover beam; and bagged backfill is filled between the top cover beam and the pipe roof umbrella arch. The construction method comprises the following steps: firstly excavating at the two sides of the tunnel opening, pouring the pre-reinforced piles, and pre-burying connecting sleeves in the piles; then, excavating the section of the pipe roof umbrella arch and keeping the core soil; inserting connecting reinforcing steel bars into the connecting sleeves, and pouring the pipe roof umbrella arch at the same time so that the pipe roof umbrella arch is fixedly connected with the pre-reinforced piles integrally; meanwhile, reserving a pipe roof sleeve in the pipe roof umbrella arch, and setting long pipe roof; and finally, filling bagged backfill above the pipe roof umbrella arch and pouring the top cover beam to finish the construction. The door type composite pipe roof umbrella arch structure disclosed by the invention is more stable, has relatively good mechanical property, and can effectively prevent the collapse of the tunnel opening and slippage of edge and slope.

Description

technical field [0001] The invention relates to a reinforcement structure of a traffic tunnel and a construction method thereof, in particular to an opening reinforcement structure during tunnel construction and a construction method thereof. Background technique [0002] The tunnel entrance is the throat of the tunnel, and the entrance part is usually broken and soft geologically, which is prone to instability and causes landslides and collapses. Therefore, the stability of the entrance section is directly related to the difficulty of tunnel construction and operational safety. In the construction of mountain tunnels, pipe shed arches are often set up for broken and soft entrance sections, and long pipe sheds are erected to reinforce the entrance section. However, when the ground surface is close to a stable state, despite the construction of a long pipe shed, cracks and slippage may still occur on the sides and upside slopes of the tunnel entrance section during undergrou...

AI Technical Summary

Problems solved by technology

However, when the ground surface is close to a stable state, despite the construction of a long pipe shed, cracks and slippage may still occur on the sides and upside slopes of the tunnel entrance section during underground excavation construction, resulting in excessive subsidence in the tunnel. The arch of the pipe shed was displaced and cracked, which led to the collapse of the tunnel

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