Bearing platform-free one-column-one-pile structure and construction method thereof

Abstract

The invention relates to a bearing platform-free one-column-one-pile structure. The bearing platform-free one-column-one-pile structure comprises a pile foundation, a column and a steel pile casing, wherein the steel pile casing is partially inserted under the ground and is partially located above the ground, the pile foundation is poured and formed in the steel pile casing, the column is providedwith an outer steel tube, and the outer steel tube is welded to the top end of the steel pile casing. In addition, the invention also relates to a construction method of the structure. The construction method comprises the following steps: S1, infiltrating the steel pile casing into a soil body to a preset depth; S2, pouring the pile foundation in the steel pile casing; and S3, aligning the outersteel tube with the steel pile casing and welding and connecting the outer steel tube and the steel pile casing. By way of directly pouring the pile foundation in the steel pile casing, the steel pile casing is combined with a column foot in use, and the steel pile casing is not pulled out, so that disturbance of surrounding soil bodies is relatively small; the steel pile casting is welded to thesteel outer tube of the column, and a bearing platform is not evacuated on the basis of guaranteeing the structural strength, so that disturbance of surrounding soil bodies is relatively small, and defects that in the prior art, disturbance of the soil bodies are relatively large in excavation of the bearing platform and the pile diameter needs to be increased are overcome effectively.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and relates to a one-column-one-pile structure without caps and a construction method thereof, which is suitable for new construction, renovation and expansion of nearby important buildings, cultural relics protection buildings, railway lines, subway lines and other buildings that need to be protected. It is also applicable to other projects that need to reduce soil disturbance during construction. Background technique [0002] At present, there are mainly two methods for the method of column feet of steel columns and piles with long soil disturbance, one is to use single pile caps, and the other is to use steel columns to insert piles In the way of the head, the steel casing needs to be lowered first to form a pile. [0003] 1. Adopt the method of single pile cap [0004] The method of adopting the single-pile cap is to lower the steel casing to drill holes first, pull out the...

AI Technical Summary

Problems solved by technology

The excavation range is large, and the surrounding soil is greatly disturbed;

[0007] 3) Larger pile heads need to be chiseled out, and the construction speed is slower;

[0008] 4) It is necessary to pull out the steel casing, and the pulling out process greatly disturbs the soil

[0011] 1) The diameter of the pile needs to be at least 400mm larger than the long side of the steel column, which is not applicable when the section size of the steel column is large;

[0012] 2) The large diameter of the pile makes it difficult to meet the requirement of 3 times the pile diameter specified in the code;

[0013] 3) The adjustment accuracy of the verticality of the steel column is poor, and additional measures to fix the steel column are required, such as ground fixing frames;

[0014] 4) If the foundation pile concrete does not reach the specified strength and does not meet the test conditions, steel columns must be installed. If the foundation piles fail to pass the test, the steel columns and foundation piles will be invalidated together

[0015] To sum up, for new reconstruction and expansion projects near important buildings, cultural relics protection buildings, railway lines, subway lines and other buildings that need to be protected, the two commonly used pile foundation construction methods have shortcomings. The soil disturbance caused by cap excavation is unacceptable when the protection requirements are high. When the pile head is inserted into the steel column, the pile diameter needs to be enlarged, and it is also unacceptable when the distance is less than 3 times the pile diameter.

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