Casing draining end bearing pile for treating liquefied foundation and construction method

Abstract

The invention discloses a casing drawing end bearing pile for treating a liquefied foundation and a construction method. The casing drawing end bearing pile for treating the liquefied foundation is that a pile body comprises an inner plastic pipe, an outer plastic pipe, a blind drain, concrete and a geotextile; a casing pile is an end bearing pile; a drilling machine is adopted and is used for drilling a hole so as to insert the outer plastic pipe which is wrapped by the geotextile into a foundation bearing course; the annular draining blind drain of which the diameter is slightly smaller than that of the outer pipe is placed on the inner side of the outer plastic pipe, so as to form a vertical draining channel; the inner plastic pipe is placed on the inner side of the annular draining blind drain; the concrete is poured into the inner plastic pipe to form the pile; and a gravel cushion layer is paved at the top of the pile along the horizontal direction, thus forming a horizontal draining channel. By adopting the casing draining end bearing pile for treating the liquefied foundation and the construction method, the bearing capacity of the pile is improved under the same amount of used concrete, the application range is wide, and the casing draining end bearing pile is applicable to the treatment of a general wear foundation and the liquefied foundation; the horizontal draining channel and the vertical draining channel are provided for foundation liquefying, and thus the possibility that the foundation is liquefied is reduced; and the casing draining end bearing pile is reasonable in structure, good in pile forming effect, low in cost and convenient to construct, and realizes the effects on foundation treatment and seismic hardening.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and water conservancy engineering, and in particular relates to a casing drainage end-bearing pile for treating liquefied foundations and a construction method. Background technique [0002] At present, the disasters caused by liquefaction in earthquakes have attracted widespread attention in engineering circles. In the past ten years, a variety of treatment methods for liquefiable foundations have been developed, among which pile foundations are commonly used to deal with liquefiable foundations, but pile foundations located in liquefiable soil layers are very easy to be severely damaged. Before the present invention, the existing pile foundations include compacted gravel piles, anti-liquefaction rigid drainage piles and the like. [0003] The vibratory compaction crushed stone pile method is a new treatment method for liquefiable sandy soil foundation developed on the basis of compact...

AI Technical Summary

Problems solved by technology

[0004] (1) It has a certain impact on the compaction of the soil and adjacent buildings, and the noise and vibration are large during construction.

[0005] (2) It is not very effective for the soil layer dominated by fine particles, because the permeability coefficient of fine particle soil is small, and the drainage channel is not smooth, which makes the pores difficult to compress

[0006] (3) It is effective to eliminate the liquefaction of the silt layer, but it has no obvious effect on improving the bearing capacity of the foundation soil

[0008] (1) The construction process of the pile is relatively complicated. During the laying process, the steel wire hose or the plastic drainage board will be damaged and fail due to the compaction of the surrounding soil due to the lack of protection.

[0009] (2) The pile belongs to the pile foundation, and the cost is relatively high in the application of large-area foundation treatment

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