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, digging the soil and expanding the bottom;using air for a second time soil taking; putting a radiation shaped steel bar into a pedestal cavity and nailing the steel bar into the hardpan; pouring a dense grout into a pedestal cavity along thesinking pipe, pouring pebbles into the pedestal cavity so as to form a concrete pedestal, putting a pre-stressed precast hollow 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. The bottom-expanding cavity of the invention has a regular geometrical shape, 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 pile work under the most economic condition ,and enhances construction security.

Description

[0001] This application is the application number 200610047085.4, the application date 2006.06.30, the invention name sinking tube prefabricated steel concrete expansion bottom pile and pile formation method. Technical field [0002] The present invention involves a construction pile foundation project and construction method, especially the expansion and pile formation methods of the prefabricated steel concrete bottoming pile of the sinking tube. Background technique [0003] It is well known that the quality of the basic project of the building plays a vital role in the impact of the quality of the building. Therefore, the construction units not only pay attention to the construction quality of the building on the ground, but also pay attention to the quality of basic projects.And invest in scientific research forces to dive into the pile foundation project to increase the utilization rate of material strength on the premise of ensuring the quality of the project. For example...

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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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