Large-span bridge girder hoisting method based on Beidou positioning

Abstract

The invention discloses a large-span bridge girder hoisting method based on Beidou positioning. A three-dimensional precise positioning system and an automatic hoisting control system are included. The three-dimensional precise positioning system comprises Beidou base stations, a Beidou positioning terminal, a differential service system and a data center. The Beidou base stations are used for continuously tracking and observing Beidou satellite signals and providing carrier phase difference data for positioning; the Beidou positioning terminal is mounted on a sports car and a hoisting point and is used for acquiring positioning data of the sports car and the hoisting point; and the automatic hoisting control system carries out processing according to the data of the data center of the three-dimensional precise positioning system, and controls the sports car and the hoisting point to run towards a target. The method has the advantages that the problems that in the prior art, the measurement precision is not accurate due to elastic deformation and position change of a traction cable, the control precision is not high due to the fact that an interphone is matched with manual operation, and consequently the parking precision and the hoisting precision of the sports car are affected are solved, automatic control and accurate fixed-point parking of the sports car in the hoisting process are achieved, and the hoisting height of a main beam is accurately and stably controlled.

Description

technical field [0001] The invention relates to a hoisting technology in the construction process of a long-span bridge, in particular to a method for hoisting a main girder of a long-span bridge based on Beidou positioning. Background technique [0002] The main girder hoisting by cable crane is a common method for the main girder installation of long-span bridges at present. The cable crane is a large-span vertical lifting lifting equipment mainly used in the engineering field. Usually, towers are installed on both sides of the valley, and steel wire ropes are erected on the towers as the main load-bearing components, and the lifting car is suspended on the wire ropes. It is a system device that pulls the sports car to reciprocate on the wire rope to realize the transportation of heavy objects on both sides of the river. It has the advantages of large span, high efficiency, relatively simple structure, and good economy. It can be used to lift and transport heavy objects ...

AI Technical Summary

Problems solved by technology

However, when the sports car is running, the pulling force of the traction rope changes constantly, and the length of the rope also changes due to elastic deformation, so that the position of the rope wound on the large friction wheel also changes accordingly, so the accuracy of the position display of the sports car is relatively poor, which affects The driver's monitoring of the operation of the cable hoisting system

[0004] In addition, the current cable crane is operated manually, and the operator manually controls the travel of the hoist. In particular, the operators of the two hoists arranged on both banks need to cooperate through the walkie-talkie. Under this operation mode, it is difficult to accurately control the speed of the sports car. Therefore, the accuracy of fixed-point parking Low, large synchronization error

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