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 thereof, in particular a method for enlarging pedestal and forming pile of an immersed tube precast reinforced concrete pedestal pile; the method 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, and put into the immersed tube to enlarge the pedestal; the earth is extracted by a device which uses air to absorb earth, when a small amount of earth is left in a base, water is poured from the mouth of the immersed tube, the water is absorbed while the poured until the earth is completed absorbed; 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 precast 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 precast reinforced concrete pile body is sunk and in even joint with the cast-in-situ base through the dowel bars of the reinforced concrete pile body to be jointed and anchored into a whole; the immersed tube is extracted out and the pile is formed. The invention extracts earth completely without granular loose earth, has high efficiency, improves the bearing capacity of single pile effectively and meets the design requirements, thereby ensuring the quality of the pile foundation work project and reducing construction cost.

Description

[0001] This application is a divisional application of application number 200610047085.4, application date 2006.06.30, invention name of bottom expansion and pile forming method of immersed tube prefabricated steel concrete expansion bottom pile. technical field [0002] The invention relates to a construction pile foundation project and a construction method, in particular to a bottom expansion and pile formation method of prefabricated steel concrete expanded bottom piles with immersed tubes. 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 utilization rate of material strength on the premise of ...

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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