Method for measuring and controlling tower column and cable pipeline in synchronous construction of tower and beam of cable-stayed bridge

Abstract

The invention provides a method for measuring and controlling a tower column and a cable pipeline in synchronous construction of a tower and a beam of a cable-stayed bridge. The method comprises the following steps: filtering the deformation of the tower column under the actions of sunshine, temperature gradient and unbalanced load out by adopting a time-segmented measurement comparison method; setting a measuring and control point on the tower column; and establishing an independent coordinate system for controlling spacial positions of the tower column and the cable pipeline. By using the method, the construction of the tower column can be measured and controlled in all weather, so that the method improves the measuring and control precision of the tower column and the cable pipeline, solves the key difficult technical problem of the synchronous construction of the tower and the beam of the cable-stayed bridge, and has great benefit to improving the construction efficiency and the quality of the cable-stayed bridge.

Description

technical field [0001] The invention relates to a construction measurement control technology of a cable-stayed bridge, in particular to a measurement control technology of a tower column and a cableway pipe during synchronous construction of a cable-stayed bridge tower column and a girder body (synchronous construction of a tower beam). Background technique [0002] With the rapid development of my country's national economy and bridge construction technology, there are more and more long-span cable-stayed bridge projects, and the pressure on the construction period is increasing. The measurement and positioning accuracy requirements of tower columns and cableway pipes are also increasing. The conventional construction methods of cable-stayed bridges are towers first, girders second, symmetrical cantilevering, and night measurement control. That is, first construct the tower column from bottom to top, after the construction of the tower column is completed, the main girder ...

AI Technical Summary

Problems solved by technology

The above-mentioned construction method can make reasonable use of the stiffness of the bridge tower column and the tension of the stay cable, and minimize the influence of sunlight and temperature gradient on the deformation of the structure by using the law of day and night temperature changes, and has a wide range of applications; its disadvantages are: , The main girder cannot be constructed simultaneously, and the construction period is long; the measurement control point is located under the bridge, and the distance from the measurement points on the main tower is quite different, the measurement accuracy is different, and the measurement error is large; choosing to measure and control at night, some Key procedures (such as installation and positioning of cableway pipes) must be arranged at night for construction, failing to make full use of the favorable construction time during the day, which further reduces construction efficiency; the environment for construction and measurement at night is poor, personnel are prone to fatigue, and safety risks are greater

[0005] 1. The tower column of the cable-stayed bridge is exposed to sunlight on one side, and the temperature rises unevenly, forming a temperature gradient. According to the principle of thermal expansion and contraction, the tower column will undergo translational deformation and rotational deformation. Column shape is difficult to control

[0006] 2. During the measurement and positioning process of cable-stayed bridge tower column construction and cableway pipe construction, it is necessary to set and use multiple measurement control points on the ground in multiple directions and with different distances from the tower column. ) distances are very different, resulting in inconsistencies in the measurement accuracy of the tower column and cableway pipe construction measurement and positioning, forming a systematic error

[0007] 3. During the simultaneous construction of the tower column and the beam body, due to the incomplete symmetry of the cable force of the cable-stayed bridge caused by the early construction of the beam body, various deformations of the tower column occur. This deformation cannot be actually measured by the existing technology, so it cannot be filtered. As a result, the measurement and control accuracy of the positioning of the tower column and the cableway pipe is low, and the construction deviation is large, which makes it difficult to meet the design requirements

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