Construction method of hoisting steel truss arch members by using high and low pole beams through the narrow opening

Abstract

The invention relates to a hoisting method of a steel truss arch rod piece, specifically a construction method of hoisting the steel truss arch rod piece by using a high and low shoulder pole beam through a narrow final closure. The method has the characteristics that a high and low shoulder pole beam system is formed before hoisting, the rod piece is placed at the outside of the projection of a steel truss arch on a site; the shoulder pole beam is the high and low shoulder pole beam formed by hanging belts with different length; the higher side of the shoulder pole beam penetrates through a narrow space firstly when passing through the narrow space, then stepped hoisting is carried out, so that a hoisting system is enabled to pass through the narrow space. According to the construction method of hoisting the steel truss arch rod piece by using the high and low shoulder pole beam through the narrow final closure, the situation that lifting appliances are excessively close to each otherwhen the rod piece is undergoing angle adjusting in the narrow space is avoided, so that the collision of the lifting appliances due to wind disturbance is avoided.

Description

technical field [0001] The invention relates to a hoisting method for a steel truss arch member, in particular to a construction method for hoisting a steel truss arch member by using high and low shoulder beams through a narrow closing gap. Background technique [0002] The basket-type steel truss arch bridge has a large span, and the cantilever assembly is usually carried out by cable-stayed buckle-hanging method. The rods can only be assembled under the steel truss arch, and then hoisted by cable cranes. However, the gap in the lower part of the arch bridge formed before closing is much smaller than the upper part. gap, and the length of both sides of the lower gap is less than the length of the upper rod to be hoisted, which results in a narrow space for the rod to pass through, making it difficult for the rod to pass through a space smaller than its own length. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide...

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Problems solved by technology

[0002] The basket-type steel truss arch bridge has a large span, and the cantilever assembly is usually carried out by cable-stayed buckle-hanging method. The rods can only be assembled under the steel truss arch, and then hoisted by cable cranes. However, the gap in the lower part of the arch bridge formed before closing is much smaller than the upper part. gap, and the length of both sides of the lower gap is less than the length of the upper rod to be hoisted, resulting in a narrow space for the rod to pass through, making it difficult for the rod to pass through a space smaller than its own length

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