Construction method of post-grouting squeezing and expanding combination cast-in-place bored pile

A technology of bored piles and construction methods, applied in the direction of sheet pile walls, foundation structure engineering, construction, etc., to achieve the effects of eliminating impact, improving the bearing capacity of foundation piles, and reducing impact

Inactive Publication Date: 2013-12-18
HEBEI CONSTR & INVESTIGATION RES INST
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Problems solved by technology

[0006] The purpose of the present invention is to provide a post-grouting squeeze expansion combined bored pile construction method suitable for use under the geological conditions of "soft and hard interbeds", whic

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  • Construction method of post-grouting squeezing and expanding combination cast-in-place bored pile

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Embodiment

[0038] A project is located on the east coast of my country. The strata within the pile foundation construction range are as follows: Layer blown sand, saturated, loose; ① layer of silt, saturated, slightly dense to medium density; ② layer of silty sand with silty clay, silty clay with silt, saturated, slightly dense to medium density; ③ layer of silt : Saturated, slightly dense to medium density; ④ Layer of silty clay with silt, partially interlayered: ⑤ Layer of silt; ⑥ Layer of silty clay: soft plastic, partially malleable; ⑦ Layer of silt, saturated, medium density ~ Dense; in order to obtain a large single pile bearing capacity (limit value 16000KN) and effectively control the uneven settlement, post-grouting extruded and expanded cast-in-place piles are designed, with a pile diameter of 1.4m, and three bearing plates for each pile. The diameter is 2.4m, the pile length is 58.8m, and the three bearing disks are set in the ③ layer of silt, the ⑤ layer of silt, and the ⑦ l...

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Abstract

The invention discloses a construction method of a post-grouting squeezing and expanding combination cast-in-place bored pile, which is suitable for being adopted under a geological condition of soft and hard interbedding. The construction method comprises the following steps of (1) drilling construction; (2) squeezing and expanding bearing disk construction; (3) borehole cleaning; (4) arrangement of a post-grouting device and downward arrangement of a reinforcing case; (5) concrete spouting; (6) post-grouting construction at the pile end and the pile side. According to the construction method disclosed by the invention, a pile foundation post-grouting technology and a pile squeezing and expanding construction technology are organically combined, and the problems of increasing the single-pile bearing capacity and reducing post-construction settlement and differential settlement of a foundation pile under the geological condition of soft and hard interbedding are solved; the construction method is suitable for being used in the situation that high single-pile bearing capacity, low post-construction settlement and low differential settlement are required under the geological condition of soft and hard interbedding, and the construction cost can be reduced.

Description

[0001] technical field [0002] The invention relates to a construction method of bored cast-in-place piles under the geological condition of "soft and hard interlayer", in particular [0003] A post-grouting extrusion-expanding combined bored cast-in-place pile construction method belongs to the technical field of civil engineering. Background technique [0004] In order to build super-large structures on the stratum with "soft and hard interlayer" deposition, the foundation mostly adopts bored cast-in-place piles to obtain a large single pile bearing capacity and effectively control the settlement of foundation piles and the uneven settlement of buildings, usually All are to increase the pile length and find a suitable pile end bearing layer in the deep formation. This practice is very uneconomical. [0005] In order to give full play to the contribution of the hard stratum to the bearing capacity of the pile foundation in the "soft and hard interlayer" stratum, one ...

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Application Information

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IPC IPC(8): E02D5/46E02D5/44
Inventor 聂庆科胡建敏王国辉李友东陈军红
Owner HEBEI CONSTR & INVESTIGATION RES INST
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