A two-hook turning method for a steel pipe arch segment

Abstract

The invention discloses a two-hook turnover method for a steel tube arch section. The two-hook turnover method comprises the following steps: making a turnover area below a watering crane, processinga step type bearing table in the turnover area, and arranging a plurality of turnover bases on a step boundary of the step type bearing table towards the steel tube arch section; arranging two steel wire ropes on a single lifting point of the watering crane, and bundling the two steel wire ropes on two limb tubes of a chord tube; clearing and enabling a commander to enter a specified position; rising lifting hooks, lifting off the steel tube arch section, stopping lifting the hooks, enabling the commander to communicate with a driver of the watering crane, ensuring lifting weight of the two lifting hooks to be consistent, forwards moving a lifting beam crane according to the position of the gravity center of the steel tube arch section until the gravity center of the steel tube arch section reaches the position of the gravity center of the turnover base, enabling the two gravity centers to be balanced, forwards moving a watering crane beam crane, and enabling the steel tube arch section to get across a balance point of the two centers. The method can turn over the steel tube arch section by only needing two hooks, saves a set of lifting systems, greatly prolongs the service life ofthe watering crane, greatly increases a utilization rate of the watering crane, and increases a turnover safety coefficient of the steel tube arch section.

Description

technical field [0001] The invention relates to the field of bridge building construction, in particular to a two-hook turning method for a steel pipe arch segment. Background technique [0002] In recent years, with the rapid development of my country's economy, large-scale construction of traffic road networks is being carried out in various parts of our country. Bridges are widely used as a common structure across rivers, lakes and seas. Bridges with low maintenance and repair costs are used more and more frequently in various road networks. [0003] For arch bridges constructed by cable-stayed buckle hangers in sections by cable cranes, the steel pipe arches are processed and manufactured in sections, and the horizontal splicing method is generally used for pre-assembly. Convert posture to standing posture. There are three main conventional construction methods for steel pipe arch section turning over: using a cable crane with four hooks for turning over in the air, usi...

AI Technical Summary

Problems solved by technology

[0004] The main disadvantage of using the four hooks of the cable crane to turn over in the air is: the structure of the cable crane itself will bear large dynamic loads, and the ability to deal with emergencies is poor. Safety

Use four hooks of a large crane to turn over in the air. Two sets of lifting systems or two large cranes need to be installed on the large crane. The investment in mechanical equipment is large and the cost is high.

The use of turning tire racks to assist turning machinery, materials and equipment requires a lot of investment and a long construction period