Half-through pile foundation suitable for karst area

Abstract

The invention discloses a half-through pile foundation suitable for a karst area, which comprises a pile foundation body. The middle part of the pile body of the pile foundation body is at least provided with a primary half-through face (5), the diameter of the pile foundation body above the half-through face (5) is greater than that of the pile foundation body under the half-through face (5), and a cushion layer (9) is arranged under the half-through face (5). The half-through pile foundation suitable for the karst area can ensure that the side resistance of the pile is exerted before a half-through force, and changes the end resistance of the pile into the half-through force on the rock mass with good engineering property on the middle part of the pile body.

Description

technical field [0001] The patent of the present invention relates to a kind of pile foundation which is suitable for use in karst areas, where the end bearing capacity of the pile foundation is changed to a middle bearing capacity arranged in the middle of the pile body, in particular, at least one level of intermediate bearing surface is set in the middle of the pile body, and the intermediate bearing surface The cushion layer is set below to ensure that the lateral friction of each section of the pile body is exerted prior to the intermediate bearing force, so that the intermediate bearing force of the pile can be exerted in a relatively good part of the karst foundation to ensure project safety. Background technique [0002] When building bridge pile foundations in karst areas, it is difficult to fully reflect the actual state of karst development in the foundation through drilling, which brings many difficulties to the project. The pile tip is difficult to set on the in...

AI Technical Summary

Problems solved by technology

Using this method to deal with the following problems: ① After the pile foundation is lengthened, the actual load-bearing properties may be friction piles, and the displacement of the pile top is difficult to control; ② It is difficult to work in the deep part of the foundation, which often increases the cost significantly, and there are construction safety problems; ③ In some areas, deep horizontal karst is extremely developed, and it is difficult to find a suitable bearing layer within a reasonable range; ④ Even if the piles are embedded in complete bedrock, the condition of the foundation around the pile tip is still difficult to predict, and the effective bearing capacity of the pile tip cannot be guaranteed

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