Concrete longitudinally-continuous pouring construction method for tunnel secondary lining vault

Abstract

The invention belongs to the technical field of construction of tunnel engineering, and particularly relates to a concrete longitudinally-continuous pouring construction method for a tunnel secondarylining vault. The lining quality problems that the arch part concrete cannot be densely packed, the secondary lining is insufficient in thickness, and the back is empty and not dense are solved; the method comprises the following steps that S100, measurement lofting is conducted; S200, a secondary lining trolley is travelled, positioned and reinforced; and S300, a longitudinally-continuous pouringtrolley is in place; S400, secondary lining side wall concrete is poured; and S500, after window-by-window layering pouring and vibrating is finished on the part of the secondary lining side wall concrete, a concrete pump pipe connector is replaced and connected with the longitudinally-continuous pouring trolley, performance detection is conducted on the field secondary lining arch concrete, andthe in-formwork concrete slump degree is required to be controlled to be 170 mm-190 mm; S600, a concrete conveying pump is started; S700, the secondary lining arch concrete is longitudinally and continuously poured in a retreating mode; S800, a station exits and a pipeline is cleaned, and the pouring is ended; and S900, RPC formwork grouting is conducted.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering construction, and in particular relates to a construction method for longitudinal continuous pouring of concrete on the second lining of the tunnel vault. Background technique [0002] With the in-depth and continuous development of railway construction work, my country's engineering construction has already transformed from the previous scale and speed type to the quality and benefit type. At present, the traditional construction technology of the second lining of the tunnel adopts the fully hydraulic lining trolley according to the layered pouring of the window and the construction technology of the bottom-up vault concrete pouring. The construction technology is often affected by factors such as pouring methods, subjective and objective factors. In particular, the bottom-up vertical roof pouring construction method is adopted for the vault, which can easily cause the concrete in the ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of adopting the fully hydraulic lining trolley according to the window-by-window layered pouring and the bottom-up vault concrete pouring construction technology, it is very easy to cause the arch concrete to be unable to be filled and compacted, resulting in insufficient thickness of the secondary lining, voids at the back, In order to solve the problems of lining quality such as lack of compactness, a construction method of longitudinal continuous pouring of concrete on the second lining of the tunnel vault is provided

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