A pile foundation construction method

Abstract

The invention relates to a pile foundation construction method, comprising step S1 of construction preparation, first leveling the site, determining the piling sequence, and then setting out on the site and preparing equipment for construction; step S2 of burying the casing; and step S3 of using a rotary excavator Drill into the hole; step S4 uses a flat bottom sand bucket to clear the hole, and step S5 uses construction machinery to lift the guide and lower it. During the lowering process, the guide should be as close as possible to the center of the drilling hole. Move the guides horizontally so that the guides are suspended on the casing, then put in a plurality of guides in turn, and make them evenly distributed on the casing, and then lower the reinforcement cage through the area surrounded by the guides; step S6, measure the sediment at the bottom of the hole , and determine whether secondary hole cleaning is required according to the design requirements; step S7, pouring underwater concrete; during the entire construction process, there is very little void soil falling to the bottom of the borehole, which effectively improves the load capacity of the cast-in-place pile.

Description

technical field [0001] The invention relates to the technical field of house construction, in particular to a pile foundation construction method. Background technique [0002] The pile foundation is an important part of the construction project, and it is also the foundation of the entire ground building. During the construction of the pile foundation, due to the influence of different areas and external factors, the construction methods of the pile foundation are mainly divided into three types: excavation Hole grouting piles, bored grouting piles, manual digging piles. [0003] Bored cast-in-situ piles have the characteristics of fast construction progress, low noise, good environmental conditions, low project cost, and are not subject to seasonal site restrictions. However, bored cast-in-place piles mainly rely on the side friction resistance of the pile body to bear external loads. The bearing capacity is low, especially when hoisting the steel cage in the borehole, th...

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Problems solved by technology

[0003] Bored cast-in-situ piles have the characteristics of fast construction progress, low noise, good environmental conditions, low project cost, and are not subject to seasonal site restrictions. However, bored cast-in-place piles mainly rely on the side friction resistance of the pile body to bear external loads. The bearing capacity is low, especially when hoisting the steel cage in the borehole, the shaking of the steel cage will cause friction and impact on the wall of the borehole, which will cause the soil on the wall of the hole to be stripped and fall to the bottom of the hole , resulting in a large amount of virtual soil at the bottom of the hole, especially in the case of groundwater, there will be a thicker silt layer at the bottom of the hole. The existence of these virtual soil and silt layer makes the cast-in-place pile subsidence

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