Welding method of pre-embedded steel bar welded joints at the two ends of primary buckle arch

Abstract

The invention discloses a method for welding embedded steel bar welding joints of two end nodes in an initial supporting arch. The method comprises the following steps: when a side pilot tunnel grille is mounted, steel bar embedding position and direction are determined first, four soil holes are punched in an outer side soil layer in the steel bar embedding direction, the embedded steel bars are inserted, the directions of the steel bars are adjusted, and then crossing points of the embedded steel bars and a main steel bar of the pilot tunnel grille are welded firmly; when a middle pilot tunnel grille is mounted, the steel bar embedding position and direction on the pilot tunnel grille are determined, four soil holes are punched in the outer side soil layer in the steel bar embedding direction, a U-shaped steel bar and the main steel bar of the pilot tunnel grille are welded firmly. Through the adoption of the method for directly embedding steel bar welding joints, the construction cost is reduced, the node connecting quality is ensured, and the node construction becomes simple and rapid.

Description

[0001] Technical field: [0002] The invention belongs to a building construction method, in particular to a welding method for pre-embedded steel bar welded joints at both ends of an initial buckle arch. Background technique [0003] At present, in the construction of the initial buckle arch of the PBA construction method of the subway station, the method of pre-embedded steel plate (+ U-shaped rib) is mostly used, that is, the method of using U-shaped rib + pre-embedded steel plate for the side arch, and the method of pre-embedded steel plate for the middle arch, (such as figure 1 , 2 shown). This method requires a large amount of steel for construction, and when the position of the steel plate is unreasonable after the position is fixed, it is difficult to adjust the position of the steel plate, resulting in insufficient welding length between the steel bar and the steel plate, and the welding quality cannot meet the design requirements. If reinforcement measures are take...

AI Technical Summary

Problems solved by technology

This method requires a large amount of steel for construction, and when the position of the steel plate is unreasonable after the position is fixed firmly, it is difficult to adjust the position of the steel plate, resulting in insufficient welding length between the steel bar and the steel plate, and the welding quality cannot meet the design requirements

If reinforcement measures are taken for the joints, the joint connection process will be cumbersome, which will increase the difficulty of construction and reduce the construction speed

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