Construction method of ultra-long bored concrete pile with large-diameter casing combination

Abstract

The invention relates to a construction method of an ultra-long bored concrete pile with large-diameter casing combination. Construction of bore forming of a pile foundation is completed by means of combination of multiple casings; the gap between every two steel casings is backfilled by sand; a reinforcement cage is hung in the most inside steel casing; concrete pouring is completed section by section through guide ducts; the most inside steel casing is pulled out after concrete pouring of the pile body is completed; then, other steel casings are pulled out so that construction of the bored concrete pile is completed. By the construction method, problems such as drilling difficulty, severe abrasion of the steel casings, proneness of pipe burying and pile breakage which are caused by overhigh friction force between the steel casings and the surrounding soil can be solved. The construction method has the advantages of deep bore, high speed, guaranteed construction quality and the like.

Description

technical field [0001] The invention relates to a construction method in the field of pile foundation engineering, in particular to a construction method for a large-diameter composite casing super-long pouring pile. Background technique [0002] In the construction of pile foundation engineering, the construction technology of full casing and full rotation pile pile is a new type of environmental protection foundation treatment technology developed in recent years. The principle of full-casing full-rotation drilling and piling technology is to use the power drive device above the ground to drive the steel casing to rotate. The bottom of the lowermost steel casing is equipped with alloy cutting teeth. As the steel casing rotates, cuts, and breaks the soil, the upper clamping device exerts pressure to press the steel casing into the soil layer. When the casing sinks to a certain depth, use tools such as punching buckets to remove the soil in the casing. Reciprocate in this...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a construction method for super-long cast-in-situ piles with large-diameter composite casings, which can solve the problems of drilling difficulties, serious wear of steel casings and easy It has the advantages of deep hole forming, fast speed, and guaranteed construction quality to solve the problems of buried pipes and broken piles

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