Method for mounting steel box girders in main tower area of cable-stayed bridge and auxiliary girder erection crane base

Abstract

The invention discloses a method for mounting steel box girders in a main tower area of a cable-stayed bridge. The method for mounting the steel box girders in the main tower area of the cable-stayed bridge comprises the six steps of mounting of a first amplitude variable girder erection crane; mounting and slippage of a first steel box girder segment of the main tower area; hoisting of a second steel box girder segment of the main tower area; dismantling of girder erection crane bases; hoisting of a third steel box girder segment of the main tower area and in-position slippage of the whole steel box girder of the main tower area; and assembly of a second amplitude variable girder erection crane. The method for mounting the steel box girders in the main tower area of the cable-stayed bridge is particularly suitable for the conditions that the altitude difference between a bridge floor and the water surface is large, and a conventional floating crane hoisting scheme is hard to implement, has the advantages of being free of limitations of the hoisting height of floating cranes and the navigation conditions of the floating cranes, is simple and novel, and has good economic benefits and social benefits, and the equipment input is less.

Description

technical field [0001] The invention relates to a bridge construction method, in particular to a new method for installing a steel box girder in the main tower area of ​​a cable-stayed bridge and an auxiliary girder erecting crane base. Background technique [0002] In recent years, my country's economy and society have developed rapidly, and infrastructure construction such as railways and highways has changed with each passing day. The long-span steel box girder cable-stayed bridges spanning rivers, lakes and seas have set off a construction climax. The construction of long-span cable-stayed bridges across rivers, lakes and seas is extremely difficult due to the influence of hydrogeological conditions. Using existing technology to erect long-span cable-stayed bridges across rivers, lakes and seas requires a large investment and high risks. [0003] At present, the construction process of steel box girder cable-stayed bridges is generally as follows: first install the stee...

AI Technical Summary

Problems solved by technology

[0006] The erection scheme has the following limitations: 1. The hoisting of the steel box girder section in the main tower area and the assembly of the girder crane are limited by the height of the floating crane

In canyon and river areas with steep bank slopes, the height difference between the bridge deck and the river bed is very large, often exceeding 100 meters. Basically, there is no floating crane with a lifting height that can meet the needs of steel box girder erection and girder crane assembly; 2. In some areas , limited by navigation conditions, etc., it is difficult for large floating cranes to reach the bridge position

For example, in the upper reaches of the Yangtze River, due to the restrictions of the Three Gorges ship lock, it is difficult for large floating cranes to reach the bridge position through the ship lock

However, in some tidal flat areas along the coast, the water depth is difficult to meet the draft conditions of large floating cranes.

Images