A Field Measurement Method for Segmental Prefabricated Bridge Erection

Abstract

The invention discloses a measurement method for a segmental precast bridge erection field. The measurement method comprises the following steps: selecting an auxiliary datum point, arranging measurement points, checking and confirming control points, adjusting an elevation, adjusting a horizontal position, measuring first-beam segment measurement points and carrying out subsequent assembly. Completion of the measurement method for the segmental precast bridge erection field through the steps is capable of ensuring that deformation control after a bridge is formed and the final linearity and internal force of the bridge can also meet expected requirements.

Description

technical field [0001] The invention relates to the technical field of on-site construction of segmental prefabricated bridges, in particular to an on-site measurement method for segmental prefabricated bridge erection. Background technique [0002] In the process of modern bridge construction, segmental prefabrication technology has been more and more applied and promoted due to its advantages of economy, high efficiency, and environmental protection. However, in the traditional construction process, due to various reasons, the actual state of the bridge and the There is a certain deviation in the initial design state. If the deviation accumulates to a certain extent and no measures are taken to identify and adjust it in time, the structural safety of the bridge after completion may be difficult to guarantee. Among them, the segmental prefabricated beam segments are not accurately positioned during assembly, resulting in a large difference between the assembled beam segment...

AI Technical Summary

Problems solved by technology

[0002] In the process of modern bridge construction, segmental prefabrication technology has been more and more applied and promoted due to its advantages of economy, high efficiency, and environmental protection. However, in the traditional construction process, due to various reasons, the actual state of the bridge and the There is a certain deviation in the initial design state. If the deviation accumulates to a certain extent and no measures are taken to identify and adjust it in time, the structural safety of the bridge after completion may be difficult to guarantee.

Among them, due to the inaccurate positioning of the segmental prefabricated beams during assembly, the position of the assembled beams is too different from the position required by the design, which is a very important reason for the decline in the safety of the bridge structure

[0003] The traditional method of assembling segmental prefabricated beams is to set the measuring points on the first beam, and then use the measuring points on the first beam as the criterion for positioning other beams, but this method must be based on the first beam The precise positioning of the section itself is the premise. More importantly, in the process of assembling the subsequent beam sections, with the influence of many factors such as the continuous increase of the load on the pier, the change of temperature and prestress, and the shrinkage and creep of concrete, the first section The actual position of the measuring point on the beam section may change continuously with the progress of the construction process. When this change exceeds the allowable range of the design, if the initial coordinates of the measuring point on the first beam section are still used as the criterion for splicing beam sections, The deformation control target after the bridge is formed may not be achieved, and the final linearity and internal force of the bridge cannot meet the expected requirements