Three-dimensional coordinate measuring construction method for short line method segment

Abstract

The invention relates to a construction method of a short line method prefabricated bridge segment. The construction method comprises the following steps: arranging a measuring pier; pouring an initial segment; pouring a first roof truss section concrete beam to form an initial segment, burying a characteristic point in the initial segment, collecting three-dimensional coordinate system through aprecise total station and precise measuring terminal software; erecting a bottom mold, a fixed end mold and a movable end plate of a second roof truss by taking three-dimensional coordinate numericalnumber of the initial section; pouring a second roof truss section concrete beam, burying a characteristic point in the second roof truss section concrete beam, collecting three-dimensional coordinatesystem of the characteristic point on the second roof truss through a precise total station and precise measuring terminal software; and prefabricating a follow-up segment based on the three-dimensional coordinate data models of the first roof truss section concrete beam and the second roof truss section concrete beam. The measuring construction method can control the production error of the section beam precisely in real time. The mounting error of the section is small and the precision of the prefabricated section beam is high.

Description

technical field [0001] The invention relates to a construction method in the field of bridges, in particular to a three-dimensional coordinate measurement construction method for segmental beams using a short-line method. Background technique [0002] Segmental prefabrication and assembly technology is to divide the beam body into several sections in the longitudinal direction, prefabricate in the factory or at the construction site according to the predetermined design plan, erect the sections in place and then stretch the prestressed steel beams to assemble each section into a Complete beam body. There is no ordinary steel bar between the segments, and the shear force between the segments is transmitted through the inlaid shear key and part of the prestressed steel beam. [0003] The currently commonly used segmental prefabrication methods include long-line method and short-line method. Compared with long-line method, the short-line method is developed later. Because of i...

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Problems solved by technology

These errors will affect the matching and manufacturing of subsequent segments. If the deviation is not corrected in time, errors will accumulate, causing the geometric alignment of the whole bridge to deviate too much from the design alignment, causing potential safety hazards and affecting normal operation of the bridge.

[0004] Existing prefabricated measurement methods for segmental beams generally use surveying and mapping equipment such as total stations, prisms, levels, and leveling rods. It is necessary to manually use a variety of surveying and mapping equipment above to carry out a large number of surveying and construction work, and the adjustment of measurement errors cannot be done from the whole. The three-dimensional overall performance of segmental beams cannot achieve timely adjustment and correction, and the adjustment efficiency is low and the adjustment accuracy is low

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