Construction method of high-altitude large-span arc-shaped prestressed beam

By real-time monitoring of the attitude and pipeline deviation of the high-altitude support system, combined with dynamic wind load model and BIM comparison, segmented casting and tensioning control are optimized, the accuracy and stability problems in the construction of high-altitude large-span arc prestressed beams are solved, and efficient construction results are achieved.

CN120465636APending Publication Date: 2025-08-12CHINA CONSTR FIRST DIV GROUP CONSTR & DEV
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Patent Information

Application Number
CN202510917560.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-03
Publication Date
2025-08-12

AI Technical Summary

Technical Problem

In the construction of high-altitude large-span arc-shaped prestressed beams, the coupling effect of dynamic air load and concrete rheology was not effectively considered, resulting in lag in the prearch degree compensation, the pipeline positioning deviation was not checked in real time, the order of segmented casting depends on experience, the calculation of tension control force is inaccurate, and the verification of final tension is insufficient, resulting in limited construction accuracy, increase in construction period and cost.

Method used

By laying high-precision inclination sensors in the high-altitude support system, combining dynamic wind load spectrum to construct a three-dimensional deformation model, monitoring and generating pre-arch degree compensation coordinates in real time; scanning the coordinates of prestressed pipelines with the BIM model to quantify axial deviation; dividing weak stiffness sections based on standard thresholds, optimizing the segmented pouring sequence; collecting the pipe curvature and friction coefficient in real time, calculating additional tensioning forces; classifying final tensioning control to generate final tensioning stress confirmation records.

Benefits of technology

The curvature control accuracy of the template is improved, the quantitative identification of pipeline positioning deviations is realized, the construction timing is optimized, the uniformity of prestress distribution in the large curvature section is ensured, the rework rate and material loss are reduced, and the forming accuracy and stress stability of high-altitude large curvature components are improved.

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Abstract

The invention discloses a high-altitude large-span arc-shaped prestressed beam construction method, and particularly relates to the technical field of prestressed beam construction, which comprises the following steps: S1, carrying out dip angle monitoring modeling to generate a pre-arch coordinate; s2, scanning pipeline coordinates, comparing the pipeline coordinates with the BIM, and building a deviation matrix; s3, performing over-limit identification and segmented pouring planning; s4, curvature friction collection is carried out, and compensation tension is calculated; and S5, a final tensioning generation record is generated after the extension amount checking is completed. A tilt angle sensor is arranged to monitor deformation of a supporting system, a three-dimensional deformation model is constructed in combination with a wind load to generate pre-arch coordinates, a total station scans pipeline coordinates and compares the pipeline coordinates with a BIM theoretical value to establish an axial deviation matrix, an overrun section is recognized, pouring units are divided, the construction time sequence is optimized, and deformation accumulation is reduced. The curvature and friction coefficient of the pipeline are collected in real time to construct a friction compensation model, graded tension control is combined with extension threshold judgment, anchoring retraction is dynamically monitored to generate a final tension record, a closed-loop control system is formed, and the forming precision and stress stability of a large-curvature component are improved.
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