Pre-pressing method for bridge bracket

Abstract

The invention relates to the field of bridge construction, in particular to a pre-pressing method for a bridge bracket. The method comprises the following steps of calculating the loading positions and quantity of pre-pressing blocks according to the area of a pre-pressing surface of the bracket, and determining observation points for observing the elastic deformation condition of the bracket during loading; placing the pre-pressing blocks on the pre-pressing surface of the bracket according to a calculation result, symmetrically loading the pre-pressing blocks from the center line of the bracket to the two sides of the bracket, and keeping the loading rate consistent; conducting stage-by-stage loading on the pre-pressing surface of the bracket, after one stage of loading is completed, calculating numerical values of all the observation points, when loading is conducted on the last stage, conducting static pressure observation for 4 h or above, and then calculating the numerical valuesof all the observation points; after two measurement results before and after the last stage of loading are stable, symmetrically unloading the pre-pressing blocks stage by stage, after each stage ofunloading is completed, recording the numerical values of all the observation points, and comparing the numerical values with loading records. Therefore, pre-pressing data of the bracket is acquiredquickly and accurately, the bearing capacity and stability of the structure are detected, and preparation is made for subsequently adjusting the bracket.

Description

【Technical field】 [0001] The invention relates to the field of bridge construction, in particular to a preloading method for bridge supports. 【Background technique】 [0002] With the rapid development of my country's infrastructure construction, a large number of cast-in-place bridges need to be erected. In bridge construction, it is necessary to preload the support with heavy objects in advance to ensure the reliability of the support and understand the elastic deformation of the support during construction. , and eliminate the inelastic deformation of the bracket, and test the bearing capacity and stability of the structure. Therefore, the preloading of the bracket is an indispensable construction process after the bracket is erected. [0003] The existing bracket preloading method is cumbersome and time-consuming, and the design of the preloading position of the bracket and the loading sequence of the preloading blocks is unreasonable, and the preloading data of the brack...

AI Technical Summary

Problems solved by technology

[0003] The existing bracket preloading method is cumbersome and time-consuming, and the design of the preloading position of the bracket and the loading sequence of the preloading blocks is unreasonable, and the preloading data of the bracket cannot be accurately obtained. Once a deviation occurs, it will cause great harm. Therefore, It is necessary to provide a more accurate preloading method

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