Invert trestle structure for simple multi-straddle type tunnel and construction method

Abstract

The invention relates to an invert trestle structure for a simple multi-straddle type tunnel and a construction method. The invert trestle structure comprises a lower excavated step, wherein a lower step to be excavated is arranged on one side of the lower excavated step; a first invert trestle is arranged on the other side of the lower excavated step; a first invert trestle filler is arranged above the first invert trestle; a support truss is arranged in the middle of the lower excavated step; a face is arranged on one side of the upper end of the lower step to be excavated; double rows of super small guide tubes are connected with the face and the upper end of a secondary liner; primary guide tube supports are arranged at the lower ends of the double rows of super small guide tubes. Compared with the prior art, the invert trestle structure has the characteristics that the straddles are increased, has the advantages that along with increase of the straddles, construction operation areas are increased, and inter-procedure streamline operation can be implemented in invert trestle construction, and has the benefits and beneficial effects that nearly a half of the operation time can be saved for invert trestle construction.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to an inverted trestle structure and a construction method for a simple multi-span tunnel. Background technique [0002] Most of the existing tunnel inverted arch trestles are of simple structure, and a few adopt the form of movable formwork, but they are all single-span structures. The construction of the tunnel inverted arch needs to be excavated through the lower steps → clear the bottom → apply the initial support of the lower part of the inverted arch → tie up the inverted arch Arch reinforcement → pouring inverted arch concrete → pouring inverted arch backfilling and other processes. After the excavation of the lower steps, the inverted arch trestle is used until the inverted arch backfill reaches the design strength. During this period, there are many construction procedures, the working surface is single, and flow operation cannot be formed; the single cycle time...

AI Technical Summary

Problems solved by technology

After the excavation of the lower steps, the inverted trestle is used until the backfill of the inverted arch reaches the design strength. During this period, there are many construction procedures, the working surface is single, and flow operation cannot be formed; the single cycle time is long, and the utilization rate of the inverted arch trestle is low.

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