Large-span tunnel arch secondary lining steel bar binding construction method based on skeleton beams

Abstract

The invention discloses a large-span tunnel arch secondary lining steel bar binding construction method based on skeleton beams. A bound tunnel arch secondary lining steel bar comprises an outer layer reinforcement mat, an inner layer reinforcement mat and a vertical connecting bar for connecting the outer layer reinforcement mat with the inner layer reinforcement mat. The construction method comprises the following steps of: arranging skeleton beam: arranging a plurality of skeleton beams below a tunnel arch primary supporting structure from front to back, wherein the skeleton beams are arch-shaped beams of which the radiuses are the same as that of the outer layer reinforcement mat, and the plurality of skeleton beams construct a load bearing structure of a tunnel arch secondary lining steel bar; and II, binding the tunnel arch secondary lining steel bar: binding the outer layer reinforcement mat on the upper parts of the plurality of skeleton beams, and suspending the inner layer reinforcement mat on the outer layer reinforcement mat through the vertical connecting bar. The method has the advantages of simple construction process, convenience in constructing, good use effect, high practical value, no damage to a paved waterproof structure and easiness and convenience in controlling the deflection of a large-span station arch secondary lining steel bar.

Description

technical field [0001] The invention belongs to the technical field of secondary lining construction of tunnels, and in particular relates to a construction method for binding steel bars of secondary lining of large-span tunnel arches based on skeleton beams. Background technique [0002] Tunnel engineering has been used so far, mainly for railways, highways, mines, water conservancy, municipal engineering, etc. Most tunnels are composed of primary support and secondary lining. During the construction of the second lining reinforcement of the tunnel, the reinforcement in the arch will often sink naturally due to the self-weight of the reinforcement. In tunnels with small spans, due to the large camber and large vector, the subsidence of the second lining reinforcement is small, so generally no anti-subsidence measures are taken. However, in the construction of the second-lined steel bars of long-span tunnels, due to the large span, small camber, and small vector, the steel ...

AI Technical Summary

Problems solved by technology

However, in the actual construction process, the use of pre-buried hooks will damage the waterproof structure, so that the waterproof quality of the tunnel cannot be guaranteed; and when the method of adding support to the second-lined steel work trolley is used, the on-site construction process will be cumbersome, and the construction Inconvenient, overall construction difficulty increases

[0003] Nowadays, with the application of long-span tunnels in subway projects and the improvement of the waterproof level of subway projects, the above two existing measures to control the sinking of the second lining of the arch can no longer meet and ensure the construction needs

The main reason is that all-inclusive waterproofing is currently used in subway construction. If hooks are reserved on the initial support base surface to control the sinking of the secondary lining steel bars, it will directly damage the waterproofing that has been laid, affecting the overall waterproofing quality and affecting the later operation. Serious potential safety hazards are buried; if the support is erected on the second-lined steel work trolley to control the sinking of the second-lined steel bar, on the one hand, the operation is cumbersome, on the other hand, the construction is difficult, and it is not convenient for on-site construction operations

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