Hoisting construction method for square butt joint and inserting connection between bridge steel box girder sections

Abstract

The invention relates to bridge construction and provides a hoisting construction method for square butt joint and inserting connection between bridge steel box girder sections. The method comprises the following steps that the box bridge sections with webs on the two sides of the mid-span of a bridge steel box girder are hoisted to an adjusting section of a jig frame firstly; a shackle is arranged between two strands of hoisting steel wire ropes and lifting lugs outside the after-installed bridge section of the box with the weds only on one side correspondingly, two strands of hoisting steel wire ropes inside the after-installed bridge section of the box with the weds only on one side are each provided with two serial shackles, and chain blocks are arranged on the steel wire ropes outside the after-installed bridge section of the box with the weds only on one side in an auxiliary mode for tightening; lifting hook is subjected to translation, when diaphragm plates of the after-installed bridge section make contact with top plates of the firstly-installed bridge section, tightening is conducted through traction of horizontal chain falls, and loosening and hook dropping are conducted through cooperation of hoisting chain falls; the diaphragm plates of the after-installed bridge section are completely stuffed in place, and then the lifting hooks completely continue to be subjected to hook dropping till complete loosening is achieved; the after-installed bridge section is measured, the scale height is adjusted by means of the method that base plates are assembled or disassembled at the tops of small vertical pillars of the adjusting section till design requirements are met; and the horizontal chain falls are loosened, the hoisting shackles are disassembled, and thus the after-installed bridge section is completed. According to the hoisting construction method for square butt joint and inserting connection between the bridge steel box girder sections, damage cannot be caused to the diaphragm plates.

Description

technical field [0001] The invention relates to bridge construction, in particular to a construction method for bridge steel box girder segments. Background technique [0002] Considering the transportation problem, the bridge steel box girder is generally divided into longitudinal sections of the box room, and there are two subsections: lap joint and flat butt joint (or plug joint). The lap joint construction is routinely used between the steel box girder bridge sections, which is easy to hoist, but the elevation weld of the full length of the site web and the roof is added. The roof is conventionally provided with U-shaped ribs. There are many unfavorable factors in bearing dynamic loads, so the horizontal butt connection between bridge sections in the span direction has become the mainstream method. [0003] When the steel box girder bridge section is flat butt (plugged) hoisting, the diaphragm of the rear-mounted bridge section is plugged between the top plate and the b...

AI Technical Summary

Problems solved by technology

Routinely, it is necessary to hoist the top and bottom cutting gaps of the diaphragm of the post-installed bridge section, which will cause irreversible damage to the diaphragm of the steel box girder, and there are quality risks, and the later welding and repair work will be heavy