Prefabricated installation method of π-shaped steel frame on the arch of upward-supporting arch bridge

Abstract

The invention specifically discloses a precasting and mounting method of a pi-shaped steel frame on an arch of a deck type arch bridge. The precasting and mounting method solves the problem that the transportation of other structural components is influenced because the period of the construction of a conventional pi-shaped steel frame is long. The precasting and mounting method comprises the following steps: a, manufacturing a precast mould frame for precasting and storing the pi-shaped steel frame; b, constructing the pi-shaped steel frame, when the pi-shaped steel frame is completely precast, adopting a vehicle to hoist and steer, and laterally transporting the steered pi-shaped steel frame to a hoisting region so as to steer the transported pi-shaped steel frame with a flat transport vehicle; and c, constructing provisional supporting piers for being supported on two sides of a web plate of the pi-shaped steel frame on bridge locations, hoisting the precast pi-shaped steel frame on the provisional supporting piers with a cable hoister so as to perform wet connecting operation, and after the wet connecting operation is completed, dismantling the provisional supporting piers so as to complete the precasting and mounting operation of the pi-shaped steel frame. The precasting and mounting method disclosed by the invention is reasonable and reliable, a hoisting bracket is not needed, security risks and construction period risks of the construction of the pi-shaped steel frame on the bridge locations are avoided, movable hoisting equipment is flexibly used so as to be matched with the construction, and the problem that the precast pi-shaped steel frame cannot be horizontally moved is solved.

Description

technical field [0001] The invention relates to a construction method for a steel frame on an arch bridge, in particular to a method for prefabricating and installing a π-shaped steel frame on an arch of an upward-supporting arch bridge. Background technique [0002] The π-shaped rigid frame is located in the mid-span of the vault of the arch bridge. It is used for high-altitude and river-crossing operations. The working environment is poor and the space is limited, but the owner has tight deadlines. When working on the arch, the transportation of materials and machinery can only be carried by the cable crane. The π-shaped rigid frame and the pier on the arch are operated at the same time, and the cable crane cannot frequently take care of the construction of the π-shaped rigid frame. The vault is far away from the shore, the concrete cannot be pumped, and the speed of the cable crane is slow, the concrete cannot be mixed during transportation, and the performance of the con...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing π-shaped rigid frame construction has a long construction period and affects the transportation of other components, the present invention provides a prefabricated installation method for the π-shaped steel frame on the arch of an upward-supporting arch bridge

[0006] With this prefabricated installation method, the π-shaped rigid frame is prefabricated outside the cable hoisting area, which eliminates the interference phenomenon caused by the simultaneous operation of the π-shaped rigid frame and the bridge pier on the arch, and the construction efficiency has been effectively improved, overcoming the existing π-shaped rigid frame. There is a problem that the long construction period affects the transportation of other components in the construction of the rigid frame

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