Construction method for drawing out prestress high concrete (PHC) pile and reusing PHC pile for retaining in deep excavation

Abstract

The invention provides a construction method for drawing out a prestress high concrete (PHC) pile and reusing the PHC pile for retaining in deep excavation. The pile drawing method mainly comprises the steps of pile and soil separation carried out through a high-pressure swing jet grouting soil removal method, static pile drawing through a pile drawing machine, examination and detection of the drawn tubular pile and the like. The construction method for using the drawn tubular pile for retaining in deep excavation mainly comprises the steps of double-shaft stirring pile construction, hammering tubular pile construction, surface soil excavation, prestress anchor cable construction, crown beam steel bar and formwork construction, crown beam concrete construction, anchor cable and crown beam maintenance, anchor cable tensioning and locking, soil excavation and the like. The PHC pile is drawn through a method combining pile periphery soil removal method and a static drawing method, damage to the PHC pile in the drawing process is avoided to the greatest content, the pile drawing efficiency is improved, and the construction period is shortened. Meanwhile, the drawn PHC pile is used for vertical retaining in deep excavation, the construction period is effectively shortened, the engineering cost is reduced, resources are saved, and the environment is protected.

Description

technical field [0001] The invention relates to a building construction method, in particular to a construction method for pulling out PHC piles and reusing them for deep foundation pit support. Background technique [0002] The PHC pile is produced by a professional manufacturer. It adopts pre-tensioning method prestressing and advanced technology such as adding finely ground materials and high-efficiency water reducing agent. A slender hollow prefabricated concrete member of constant section. With the rapid development of the national economy, the application of science and technology has advanced by leaps and bounds, and the new materials and new technologies in the construction industry have developed rapidly. In the past ten years, the amount of PHC piles in construction pile foundation projects at home and abroad is huge. At present, the annual use of PHC piles in China exceeds It is widely used in various civil engineering infrastructures such as industrial and civil...

AI Technical Summary

Problems solved by technology

[0003] Conventional underground PHC pile pulling construction is not only time-consuming and laborious, but also usually does not consider the problem of reusing the pulled out PHC piles, so the pulled out PHC piles are generally broken and severely damaged and cannot be reused, resulting in a large waste, and a large number of The disposal of waste piles is also a difficult problem, which increases construction costs