Super-long vertical unbonded prestress structure and assembling method thereof

Abstract

The invention discloses an ultra-long vertical unbonded prestressed structure, which includes a steel rod for prestressed concrete, an anchoring structure for anchoring the two ends of the steel rod for anchoring the prestressed concrete, and a circumferential coating on the prestressed concrete A concrete structure around steel rods is used, and the upper and lower ends of the steel rods for prestressed concrete are exposed outside the concrete structure. There is also a method for assembling an ultra-long vertical unbonded prestressed structure, comprising the steps of: (1) setting out a position line; (2) laying steel rods and steel bars for said prestressed concrete, and anchoring said prestressed concrete using the lower end of the steel rod; (3) pouring the concrete structure; (4) tensioning the upper end of the steel rod for the prestressed concrete, and then anchoring the upper end of the steel rod for the prestressed concrete. The super-long vertical unbonded prestressed structure of the present invention saves materials, has good vertical prestressed anchoring effect, and has a simple and convenient assembly method, which is beneficial to construction and popularization.

Description

technical field [0001] The invention relates to the field of road and bridge construction, in particular to an ultra-long vertical unbonded prestressed structure and an assembly method thereof. Background technique [0002] With the continuous development of high-grade highway construction in our country, prestressed concrete continuous steel bridges have been more and more widely used in modern highway construction due to their advantages such as good overall performance, high structural rigidity, small deformation, and good seismic performance. Therefore, the use of three-dimensional prestressing is also increasing in bridge construction, especially for continuous steel bridges with large spans. Realization of stress structures. [0003] At present, the vertical prestress of the three-dimensional prestressed concrete box-section beam bridge web in most of the large and medium-span bridges that have been built or are under construction at home and abroad is mostly realized...

AI Technical Summary

Problems solved by technology

[0004] However, for bridges with larger spans and larger 0# block heights, the strength of the finished rolled rebar is not ideal, and prestressed steel strands are generally used

However, due to the flexibility of steel strands and metal bellows, vertical positioning is extremely difficult

The vertical prestressed steel strand at the top of the pier needs to be pre-embedded during the construction of the last 6m of the pier column, and the 0# block is poured in stages due to its high height, and the steel strand and corrugated pipe are interfered by multiple pouring in the vertical direction , so that the steel strands are easily damaged by electric welding, the corrugated pipes are easily broken by the vibrating rod and the grout leaks, resulting in pipeline blockage and generally poor pipeline grouting effect, and the overall vertical prestressed construction quality and construction efficiency cannot be obtained. ensure

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