Bottom expanding and piling method by demolishing of pipe sank prefabricated steel concrete bottom expansion pile

Abstract

The invention discloses a construction pile foundation engineering and application method, in particular relates to a blasting enlarging base and piling method for immersed tube preformed steel concrete under-reamed pile. A first section of an immersed tube is pressed into an earth body, a second section of the immersed tube is screwed onto the upper end of the first section of the immersed tube,and the immersed tube is pressed onto a design elevation hard pan; a metal pile head is taken out, emulsified oil or ammonium antimony explosive is put in through an immersed tube opening, and the immersed tube is unsealed after the explosive is blasted; an air soil suction device is used to take soil; radial reinforced bars are put into a base cavity together with pan soil, preset strong cement grout on the ground are poured into the base cavity through the immersed tube opening, gravel is then poured into the base cavity to form a sand-free concrete base, and a preset steel concrete body isput in and is in abutting anchoring joint with the concrete base made on spot; and finally the second section of the immersed tube is pull out before the first section of the immersed is pull out, and cement grout is then poured into the clearance left by the immersed tube to form the pile. The invention takes clear soil without granular void soil and with high efficiency.

Description

[0001] This application is a divisional application with the application number: 200610047831.X, the application date: September 21, 2006, and the invention title: the blasting bottom expansion and pile forming method of immersed tube prefabricated steel concrete bottom expansion piles. technical field [0002] The invention relates to a construction pile foundation engineering and a construction method, in particular to a blasting bottom expansion and pile forming method of immersed tube prefabricated steel concrete bottom expansion piles. Background technique [0003] It is well known that the quality of building foundation works plays a vital role in the influence of building quality, so each construction unit not only pays attention to the construction quality of above-ground buildings, but also pays more attention to the quality of foundation works. And invest in scientific research to tap the potential of the pile foundation project, so that it can improve the utilizati...

AI Technical Summary

Problems solved by technology

[0004]1. Part of the soil in the pile body was excavated manually, the construction surface was too large, the workload of soil extraction increased significantly, and the efficiency was low;

[0005]2. Since there is no immersed tube as support for the bottom expansion equipment, the positioning is not accurate, the expansion angle of the base is too small, and the parameters in the bottom expansion process cannot be guaranteed, so that the pile The quality of the pile is not easy to control, and it is difficult to meet the design requirements, resulting in a greatly reduced bearing capacity of the single pile;

[0006]3. There are potential safety hazards for construction personnel, and accidents are likely to occur if construction personnel do not pay attention;

[0007] 4. The scope of use is narrow, not only not suitable for small-diameter pile bottom expansion, but also not suitable for bottom expansion and bottom expansion of prefabricated piles and highly complex geological conditions. Pile;

[0008]5. The granular loose soil sediment in the cavity of the expanded bottom is not clean, which has a serious adverse effect on the bearing capacity of the pile. Based on the above situation, in order to improve the unit Pile bearing capacity, to reduce foundation engineering costs, must be improved

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