Tunnel second lining reinforcing steel bar protection layer control construction method

Abstract

The invention discloses a tunnel second lining reinforcing steel bar protection layer control construction method, and relates to the technical field of tunnel construction. The method comprises the specific steps of reinforcing steel bar positioning, wherein in the tunnel longitudinal and annular direction, positioning ribs are symmetrically mounted from the centre of an arch top to the two sides, connecting positions of longitudinal distribution ribs and / or annular main ribs are marked on the positioning ribs, inverted arch reinforcing steel bars of the first length are reserved in a construction joint of an inverted arch following wall, joints of adjacent longitudinal main ribs and / or the annular main ribs are staggered by the first width or above, and the thickness of a concrete net protection layer is the first thickness; and reinforcing steel bar mounting, wherein according to the reserved position, the longitudinal distribution ribs and / or annular main ribs are fixed to the connecting positions, the distribution ribs are laid and fixed, and finally, stirrups are laid. Through the implementation manner, the second lining reinforcing steel bar mounting quality is improved, andthe design needs are ensured.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a method for controlling the construction of the steel bar protective layer of the second lining of the tunnel. Background technique [0002] The secondary lining of the tunnel is the secondary lining of the tunnel. It is a reinforced concrete structure that is poured on the inner side of the primary support in the tunnel engineering construction by molding or secondary lining integral trolley. Relatively speaking, the secondary lining and the initial support refer to the inner lining built with concrete and other materials under the condition of the initial support of the tunnel, so as to achieve reinforcement support, optimize the route waterproof and drainage system, beautify the appearance and facilitate installation Communication, lighting, monitoring and other facilities to meet the requirements of modern high-speed road tunnel construction. [0003] In the concrete stru...

AI Technical Summary

Problems solved by technology

The reasons are as follows: First, the on-site construction personnel do not fully understand the importance of the protective layer of steel bars, which can easily lead to excessive or insufficient thickness of the protective layer of steel bars, which seriously affects the quality of the secondary lining; second, the thickness of the protective layer is not adjusted according to the different use environments Reasonable adjustments, failure to take reasonable countermeasures for the reduction in the thickness of the protective layer caused by the decline of the vault, etc.; these are the key factors that cause damage to the quality of the tunnel

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