Blast bottom expanding and pile-forming method for pipe sinking prefabricated steel concrete pedestal pile

Abstract

The invention discloses a building pile foundation project and a construction method, in particular a method for blasting enlarging pedestal and forming pile of an immersed tube precast reinforced concrete enlarged pedestal pile, and comprises the following steps that: the immersed tube is passed through a soft earth layer and pressed to a designed level hard earth layer; a metal pile head is taken out, after explosive is ignited, the mouth of the immersed tube is sealed, after the explosion is finished, objects sealing the mouth of the immersed tube are opened; second earth extracting is processed by a device which uses air to absorb earth; radial reinforcing steel bars are arranged in the cavity of the base, and the hard earth is hammered into the cavity of the base, the concrete premade on the ground is filled in a long barrel and the barrel is put to the bottom of the immersed tube from the mouth of the immersed tube, when iron bars arranged on the bottom of the barrel touch the hard earth, the bottom gate of the barrel is forced open, then the concrete falls into the cavity of the base to form a cast-in-situ base, the prestress precast hollow pile body is put and in even joint with the cast-in-situ base through the dowel bars of the reinforced concrete pile body to be fixed and anchored into a whole; after grout is poured along the inner side of the immersed tube mouth, the immersed tube is extracted and the pile is formed. The earth extracted by the invention is complete without granular loose earth, the efficiency is high, the bearing capacity of single pile is improved greatly, the construction cost is reduced and the construction safety is improved.

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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