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 to a bottom-expanding and pile-forming method for a sinking pipe precast steel concrete pedestal pile, comprising penetrating the sinking pipe through a soft soil layer and pressing the sinking pipe to a design height hardpan; taking out a metal pile head, descending the sinking pipe to expand the bottom, finishing the bottom expanding and soil digging, hauling the bottom expanding device out of the ground, taking soil with an air soil absorption device until the clearance of the soil; putting aradiation shaped steel bar into a pedestal cavity and nailing the steel bar into the hardpan, pouring a qualitative concrete produced on the ground through the sinking pipe to the pedestal cavity toform a concrete pedestal, descending the precast steel concrete pile body and integrating with an on-the-spot poured concrete pedestal docking anchor through a steal bar at the bottom as a whole; pulling out the sinking pipe to form a pile after pouring grout along an interior side of the sinking pipe. The invention selects clear soil without grain virtual soil, has high efficiency, enhances effectively single pile bearing capacity, reaches design requirements, guarantees pile pedestal project quality, reduces construction cost, increases material strength utilization ratio, and leads the pileto work under a most economic condition, and enhances construction security.

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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