Longspan pipe truss pulling bar lifting and overhead rotating emplacing construction method

Abstract

The invention discloses a longspan pipe truss pulling bar lifting and overhead rotating emplacing construction method which includes the following steps: 1), truss manufacturing and assembling, 2), pipe truss hoisting, 3), pulling bar moving, and 4), pulling bar removing. When a truss is assembled, an included angle of 30 degrees is formed between the truss and an installation positioning axis, the truss is lifted to exceed a concrete structure in height, and then rotated by 30 degrees to a design axis. The axis of the truss is rotated by 30 degrees to enable the truss to reach the position same as the position of the installation axis through the pulling bar erecting process, and therefore the pulling bar lifting and overhead rotating emplacing is achieved. The traditional single-foot pulling bar which is simple and flexible is adopted, in-place installation is achieved through pulley blocks, chain fall, winching and the like, an independent single-foot pulling bar can be adopted for hoisting in the hoisting construction for large components at certain special positions or on the situation that large hoisting machinery can not be adopted or the adoption of the large hoisting machinery can cause extremely large increase of construction cost, and the longspan pipe truss pulling bar lifting and overhead rotating emplacing construction method is high in work efficiency and low in cost.

Description

technical field [0001] The invention mainly relates to a construction method of a large-span pipe truss, in particular to a construction method of pulling out a rod for lifting a large-span pipe truss and rotating it in the air. Background technique [0002] With the development of steel structures, large-span pipe trusses are widely used. Most of the general pipe trusses are hoisted in place by tower cranes, truck cranes, crawler cranes, etc. Located above the concrete, the weight is heavy. If the tower crane is used to install the pipe truss, the tower crane needs to be reinstalled according to the site conditions. If a tower crane is used, it needs to be reinstalled twice; in addition, the truss truss is hoisted in sections to erect a load-bearing frame, which is expensive, difficult to hoist, low in work efficiency, labor-intensive, time-consuming and laborious, and cannot meet the use requirements. Moreover, the lifting capacity of the tower crane is not enough to inst...

AI Technical Summary

Problems solved by technology

If a tower crane is used, it needs to be reinstalled twice; in addition, the truss truss is hoisted in sections to erect a load-bearing frame, which is expensive, difficult to hoist, low in work efficiency, labor-intensive, time-consuming and laborious, and cannot meet the use requirements. Moreover, the lifting capacity of the tower crane is not enough to install the overall hoisting in place, the truck crane cannot approach, and the working radius is very large, so it is not convenient to use the truck crane for hoisting, especially in some places with complex construction environments, tower cranes, truck cranes, crawler cranes and other hoisting methods Cannot meet the conditions of use at all

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