Double-span simply-supported inverted arch trestle rapid construction method

Abstract

The invention discloses a double-span simply-supported inverted arch trestle rapid construction method. An inverted arch second-liner operation trestle is in place, the steps of clearing the bottom ofthe surface of an inverted arch initial support, performing waterproof drainage construction of the inverted arch second liner, constructing inverted arch reinforcing steel bars, installing an inverted arch floating mold in place, installing an inverted arch end mold, installing a buried type water stopper in the inverted arch end, performing model building on the inverted arch second liner, disassembling the inverted arch second-liner floating mold, disassembling the inverted second-liner end mold, installing an inverted arch backfilling formwork, performing inverted arch backfilling concrete maintenance, and moving the inverted arch second-liner inverted arch trestle to the next circular stage are sequentially executed; after the filled concrete strength reaches the demolding strength,the concrete can be moved to the next operation region. The tunnel second-liner construction quality is ensured, in traditional construction, half construction is adopted, and the tunnel inverted archconstruction progress is accelerated, so that an artificial construction gap exists between the inverted arch support and the second liner, damage is caused to waterproof materials, constructed steelbars and finished concrete at the constructed half side, the tunnel waterproof and drainage problem is affected, and the concrete integrity quality problem is affected.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a rapid construction method of a double-span simply supported inverted arch trestle bridge. Background technique [0002] The single-span simply supported inverted arch trestle construction method is used in the existing tunnel construction. However, the fastest construction speed can only guarantee a cycle of 5-7 days, and the daily progress is less than 2m. If the working surface is increased to ensure the progress, the distance between the tunnel face and the lining must be increased, causing the safety step to exceed the standard, so that the contradiction between the construction progress and the safety step has not been well resolved. [0003] However, the rapid construction method of the double-span simply supported inverted trestle bridge solves the above problems well. Since the excavation time of the initial support of the inverted arch does not...

AI Technical Summary

Problems solved by technology

[0002] In the existing tunnel construction, the single-span simply supported inverted arch trestle construction method is used, but the fastest construction speed can only guarantee a cycle of 5-7 days, and the daily progress is less than 2m

If the working surface is increased to ensure the progress, the distance between the tunnel face and the lining must be increased, causing the safety step distance to exceed the standard, so that the contradiction between the construction progress and the safety step distance has not been well resolved.

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