Assembly type connecting method for steel bars of tunnel concrete lining structure

Abstract

The invention provides an assembly type connecting method for steel bars of a tunnel concrete lining structure. The method comprises the following steps that 1, a positioning jig in each unit is madeaccording to the size of a tunnel; 2, primary machining is conducted on steel bar raw materials; 3, the steel bars of all the units are subjected to machining shaping through all the positioning jigs,wherein the steel bars of all the unit comprise the arch-unit steel bars, the side-wall-unit steel bars and the inverted-arch-unit steel bars; and 4, the steel bars of multiple inverted-arch units are hoisted into an inverted-arch pit to be spliced to form single inverted-arch segments, and then the inverted-arch segments are positioned. Compared with the prior art, compared with inverted-arch and second lining steel bar on-site binding, the mechanical degree of segmental prefabrication and assembly is greatly improved, and the number of downhole construction operators and the operation timeare effectively decreased. Due to the fact that bolt connection is adopted among the unit steel bars, electric welding construction is not needed, and the second-lining water seepage phenomenon causeddue to the fact that a waterproof board is burnt by electric welding is avoided.

Description

technical field [0001] The invention belongs to the technical field of tunnel lining, and in particular relates to an assembled connection method for structural steel bars of tunnel concrete lining. Background technique [0002] The secondary lining of the tunnel is the only exposed part of all the structures of the tunnel. While ensuring the stability of the tunnel structure, it also bears the heavy responsibility of the appearance of the tunnel. The structure of the surrounding rock with good geological conditions is basically stable after the initial support. At this time, the secondary lining is used as a safety reserve, and it is generally a plain concrete structure. It is difficult to ensure the long-term stability of the structure in the poor surrounding rock section after the initial support, and the secondary lining is required to provide support to ensure the stability of the tunnel structure. At this time, the secondary lining is a reinforced concrete structure. ...

AI Technical Summary

Problems solved by technology

At this stage, the construction of secondary lining and inverted arch reinforcement generally adopts the on-site binding method, but the construction accuracy of this method is insufficient, the degree of mechanization is not high, and more construction workers are required, and the connection of reinforcement requires electric welding, and there is a phenomenon of electric welding burns on the waterproof board , which will adversely affect the waterproofing of the secondary lining

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