Method for enlarging bottom and pile making of immersed tube and prefabricated steel concrete under-reamed pile

Abstract

The invention relates to a method for constructing tile foundation, especially providing a club-footed pile and a pile-forming method of sink tube preset steel concrete club-footed pile, wherein it comprises: designing the sink tube with metallic pile head to standard rigid layer; taking out metallic pile head, using club-footed device to expand the bottom; forming base chamber at the bottom, using air adsorb device to take soil; arranging radial steel bar into chamber and nailing it into rigid soil; pouring the concrete into chamber to prepare the concrete base; inserting the preformed steel concrete post and using its bottom bar to connect the poured base; drawing out sink tube to form post. The invention has standard geometrical shape, without particle soil and with high efficiency.

Description

technical field [0001] The invention relates to a construction pile foundation project and a construction method, in particular to a bottom expansion and pile forming method of immersed tube prefabricated steel concrete bottom expansion piles. Background technique [0002] 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 ensuring the quality of the project. As can be seen from the calculation, the bearing capacity of the pile tip designed by the solid pile only uses about 20% of the strength of the pile body. For the sake of safety, all countries have stipulated a safety ...

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Problems solved by technology

[0003] 1. Part of the soil body of the pile is dug out manually, the construction surface is too large, the workload of soil extraction is obviously increased, and the efficiency is low;

[0004] 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 quality of the pile is not easy to control, and it is difficult to meet the design requirements, resulting in the single pile The bearing capacity is greatly reduced;

[0005] 3. There are potential safety hazards for construction personnel, and construction personnel are prone to accidents if they do not pay attention;

[0006] 4. The scope of use is narrow, not only not suitable for bottom expansion of small-diameter piles, but also not suitable for bottom expansion and pile formation in prefabricated piles and highly complex geological conditions;

[0007] 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 bearing capacity of the single pile and reduce the cost of the foundation project, it must be improved

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