Construction method for negative pressure vacuum supplementary grouting of vertical prestressed duct of continuous beam

By installing T-junctions and vacuum pumps in the prestressed ducts to perform negative pressure vacuum grouting, the problems of incomplete grouting and corrosion fracture caused by blockage of the prestressed ducts were solved, achieving smooth grouting and improving the construction quality and service life of the bridge.

CN117867986BActive Publication Date: 2026-06-26CCCC THIRD HARBOR ENG CO LTD NINTH ENG CO LTD +1
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Patent Information

Application Number
CN202410128540.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-01-30
Publication Date
2026-06-26
Estimated Expiration
2044-01-30

AI Technical Summary

Technical Problem

In existing technologies, when prestressed ducts are blocked and lack ventilation holes, incomplete grouting or grout leakage can lead to corrosion and breakage of prestressed tendons in the later stages, and make grouting difficult, affecting the construction quality and service life of bridges.

Method used

The method of negative pressure vacuum supplementary grouting for vertical prestressed ducts of continuous beams is adopted. By installing equipment such as tee pipes, ultra-high vacuum pumps and manual grouting pumps, micro-expansion fast adhesive is used to seal the gaps, vacuum degree test and water injection test are carried out, uniform cement grout is prepared, and negative pressure is used to achieve smooth flow of grout in the duct.

Benefits of technology

This ensures smooth flow of grout within the grouting pipe, avoids grouting difficulties, guarantees the grouting quality of the prestressed duct, and improves the construction quality and service life of the bridge.

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Abstract

The present application relates to the field of building construction technology, and more particularly to a continuous beam vertical prestressed pipe negative pressure vacuum supplementary grouting construction method; first, construction preparation is carried out, the types of materials are checked whether complete, the quantity is checked whether to meet the construction requirements, the quality should meet the design requirements, the equipment and tools are checked whether complete, whether can normal operation, then, grouting preparation is carried out, according to the construction requirements, grouting module is installed, then, vacuum is tried to draw, vacuum degree detection is carried out, then, water and sundries in the pipe are cleaned, then, slurry is configured, formal vacuum grouting is started, vacuum is drawn to the design negative pressure value, after reaching the design pressure value, vacuum valve is closed, grouting valve is opened, after the end of pressure maintaining, grouting valve is closed, finally, vacuum pump and grouting equipment are removed, grouting is finished, through the above-mentioned mode, the slurry can flow smoothly in the grouting pipe, the phenomenon of grouting difficulty does not appear, and it is beneficial to grouting operation.
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Citation Information

Patent Citations

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