Construction method of pressurized cast-in-place pile based on reinforced fibers and metakaolin

Abstract

The invention discloses a construction method of a pressurized cast-in-place pile based on reinforced fibers and metakaolin. Fiber reinforced materials such as steel fibers are used, and a geopolymermaterial which is mainly prepared from metakaolin is also employed, so the tensile property and the ductility of the concrete are improved; a foundation pit is excavated on the surface, so the surfaceconstruction waste and coarse-grained soil are removed; through a top steel casing, the concrete construction quality of the pile top is guaranteed; a hollow drill rod is driven by a power device toperform drilling to the designed elevation in foundation soil, and then the hollow drill rod is rotated reversely, wherein in the lifting process, a composite concrete material added with fibers and metakaolin is poured into a cavity in the top of the drill rod and the hollow drill rod through pressurization of a ground pump, and a pile body is formed; and finally embedded steel bars are insertedinto the pile body. The construction method has the advantages of no need of a mud protection wall, no sediment, no mud pollution, high construction speed, low construction cost, high pile body filling rate and no post-inserted reinforcement cage. The method is suitable for pile foundations with the pile diameter requirement of 400-800 mm and the drilling depth within 30 m.

Description

Technical field [0001] The invention is a construction method based on reinforced fiber and geopolymer pressurized cast-in-place pile foundation, belonging to the technical field of civil engineering. Background technique [0002] Ordinary mud-protected bored piles have complicated technology, poor stability of the pile concrete quality and bearing capacity, high probability of quality accidents, and the lubrication effect of mud and the soft cushion effect of the sediment at the bottom of the hole cause low bearing capacity and low construction efficiency , The mud pollutes the ecological environment and other shortcomings. In order to overcome the above-mentioned problems of ordinary bored piles, China began to innovate on the foundations of long spiral bored piles in the 1990s. For example, in 1999, Cao Zengguo et al. proposed "Spiral Lifting Soil Pressure Grouting Cement Mortar Pile Composite Foundation and Its Construction Technology" (Publication No.: CN 1233696A), drilled...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings of traditional cast-in-place piles such as low quality, construction mud pollution, complicated process, and high cost, the invention provides a construction method for pressurized cast-in-place piles based on reinforced fiber and metakaolin

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