Construction method for cast-in-place pile through punching and base expanding and base expanding device

Abstract

The invention discloses a construction method for a cast-in-place pile through punching and base expanding and a base expanding device. The method includes the steps of 1) punching which includes reserving the pile position and pressing a protection drum into soil by utilizing hydraulic pressure; 2) base expanding which includes connecting a drill rod and the base expanding device and placing the drill rod and the base expanding device into the protection drum; 3) pile end construction which includes pouring a hard bulk material into a hole, utilizing a heavy punch to conduct tamping repeatedly till the material is compacted and pressing a conical pile head into the pile end through the heavy punch; 4) pile body construction which includes that a connection pipe is connected with the drill rod through threads, the connection pipe is welded with a first rod piece, two ends of the first rod piece are connected with a second rod piece through bolts, the second rod piece is arranged in a guide groove through a bolt, the first rod piece is fixed on the second rod piece through a bolt, a baffle is arranged on the connection rod, the connection rod is connected with the bolts, and the connection rod is welded at the bottom of a slag clearing drum. The construction method is easy to implement, simple to operate, convenient to construct, reliable in piling quality, low in construction cost, high in bearing capability, simple in structure and convenient to use. Functions of a conventional base expanding device can be achieved, and the problem that a conventional base expanding drill bit can not effectively clear slag at the bottom of the pile is solved.

Description

technical field [0001] The invention relates to the technical field of perforated and bottom-expanded cast-in-situ piles, and more particularly relates to a construction method for perforated and bottom-expanded cast-in-situ piles, and also relates to a bottom-expanding device for perforated and bottom-expanded cast-in-situ piles. Background technique [0002] At present, the dominant pile types used in various projects mainly include bored cast-in-place piles, immersed pipe piles, prestressed pipe piles, artificial hole-digging piles, and various flexible and semi-flexible piles for soft foundation treatment (such as mixing piles, Powder spray pile, bulk material pile, etc.). In practice, it is found that these pile types have great limitations, such as: the immersed pipe pile has simple equipment and convenient construction, but its fatal weakness is that the pile body often shrinks, segregates and breaks when the soil is squeezed in saturated soil, and the pile The diame...

AI Technical Summary

Problems solved by technology

[0005] Another object of the present invention is to provide a bottom-expanding device for punching and bottom-expanding cast-in-place piles, which has a simple structure and is easy to use. The problem of effectively cleaning up the sediment at the bottom of the pile

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