Method for grouting construction of prestressed pipe

Abstract

The invention discloses a method for grouting construction of a prestressed pipe. The method includes following steps: a pulper, a grout storage tank and a mudjack machine are connected through a pipeline; a discharge port of the mudjack machine is connected with a feed port of the prestressed pipe through the pipeline, and a discharge port of the prestressed pipe is connected with a vacuum pump through the pipeline; the pulper is started, mixing water and grouting material powder are added, water-binder ratio is controlled to be 0.27, stirring is performed for 3-5 minutes, fluidity is measured to be 10s-17s (second), and grouting material is poured in the grout storage tank; the vacuum pump is started so that pressure in the pipeline remains from minus 0.06 to minus 0.10 Mpa (mean pulmonary arterial pressure), and the mudjack machine is started to continue to grout; and when the other end of the prestressed pipe discharges cement paste identical to a stipulated fluidity, an outlet valve and the vacuum pump are shut, and then a grouting process is finished. The method has the advantages that prestressed concrete construction quality can be greatly improved, construction period is shorted, construction cost is saved, common quality problems like non-solid grouting and untight paste during pipeline grouting construction are solved, structure project quality of a prestressed bridge is guaranteed, and safety service life of a bridge is greatly enhanced.

Description

[0001] technical field [0002] The invention belongs to the technical field of construction engineering, in particular to a high-performance grouting construction method for prestressed pipelines. Background technique [0003] With the vigorous development of my country's infrastructure facilities, prestressed concrete structures are widely used in large-span, high-rise, and giant structures of large-scale projects due to their significant technical and economic advantages. In post-tensioned prestressed concrete structures, the quality of grouting materials directly affects the safety and reliability of the structure. The grouting material and grouting process are the basis for protecting the prestressed steel bar from corrosion, reducing the loss of prestressed force, ensuring the effective transfer of stress between the prestressed steel bar and concrete components, effectively improving the overall bending stiffness of the structure or component, and making the post-tens...

AI Technical Summary

Problems solved by technology

[0004] Due to the high water-binder ratio of traditional construction grouting materials, the prestressed channel grouting is bleeding, not dense, and pores are formed, resulting in quality problems such as corrosion of prestressed steel bars, sharp reduction of end faces, broken wires, and loss of prestressed forces, resulting in The safety factor of post-tensioned prestressed structural engineering is reduced, and there have been many bridge collapses at home and abroad due to the loss of bearing cross-section caused by the corrosion of prestressed steel bars.

At present, the prestressed bridges that have been built and used or are under construction in China all have the common quality problem that the prestressed channel grouting is not dense, leaving a huge safety hazard for the long-term safe operation of the bridge.

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