Treatment method for difficult waterproof curtain pile forming caused by too large filing pile filling coefficient

A technology of water-stop curtain and filling coefficient, which is used in excavation, construction, infrastructure engineering, etc., can solve the problems of excessive filling coefficient, difficult to guarantee, and small net spacing of piles, and achieves wide application, convenient processing and wide application. Effect

Inactive Publication Date: 2018-05-01
CHINA MCC20 GRP CORP
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the prior art, to provide a treatment method for water-stop curtain piles that are difficult to form piles due to excessive filling coefficients of cast-in-situ pi

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  • Treatment method for difficult waterproof curtain pile forming caused by too large filing pile filling coefficient
  • Treatment method for difficult waterproof curtain pile forming caused by too large filing pile filling coefficient
  • Treatment method for difficult waterproof curtain pile forming caused by too large filing pile filling coefficient

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Embodiment Construction

[0021] A method for treating water-stop curtain piles that are difficult to form piles due to excessive filling coefficients of cast-in-place piles, comprising the following steps:

[0022] Such as figure 1 , 2 Shown: Step 1: According to the net spacing of foundation pit surrounding protection piles, geological survey report data, and the actual value of the concrete filling coefficient of on-site construction, it is normal for the concrete filling coefficient to be less than 1.2, and preliminarily judge the "neck expansion" of concrete pouring pile 1;

[0023] Step 2: After the cast-in-place pile reaches more than 70% of the design strength, carry out the construction of the rotary spraying water-stop curtain pile at the midpoint of the line connecting the centers of the adjacent cast-in-place piles according to the design drawings;

[0024] Step 3: For piles with serious "neck expansion" of concrete pouring piles, it may be difficult or impossible to drill with rotary grou...

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Abstract

The invention relates to a treatment method for difficult waterproof curtain pile forming caused by a too large filing pile filling coefficient. The treatment method comprises the steps that firstly,the neck expanding situation of a concrete filling pile is preliminarily judged; secondly, after the filling pile reaches 70% or above of the design strength, rotary jet grouting waterproof curtain pile construction is conducted on the middle point of the connecting line of circle centers of adjacent filling piles; thirdly, for a pile body, with serious neck expanding, of the concrete filling pile, the concrete serious neck expanding depth and degree are preliminarily judged; fourthly, surveying and setting out are conducted, and the filling pile radius distance point is obtained when the middle point of the connecting line of the circle centers of the two adjacent filling piles outwards moves towards the outer side by 1/4-1/3; fifthly, drilling machine hole guiding is conducted, and is deeper than the designed pile bottom elevation by 30-50 cm; and sixthly, rotary jet grouting waterproof curtain pile construction is conducted. The treatment method is wide in application, and application of the waterproof curtain pile in the aspects of foundation treatment, soil property improvement, water sealing and intercepting and the like is wide.

Description

technical field [0001] The invention relates to a pile-forming technology for water-stop curtain piles, in particular to a treatment method for the difficulty in forming water-stop curtain piles due to excessive filling coefficients of cast-in-situ piles. Background technique [0002] Generally speaking, the foundation pit surrounding protection piles are mainly concrete pouring piles, and the hole forming methods are generally impact drilling, rotary drilling, etc. For areas with high groundwater levels, supporting construction is required for foundation pit excavation. Water curtain piles (high-pressure rotary spray piles, SMW piles, etc.). However, for artificial filling, artificial filling of gravel soil, sandy soil, silt and gravel, and pebble geological layers, due to the need to use mud for wall protection operations due to rotary drilling or impact drilling, resulting in existing problems during the construction process. Different degrees of hole collapse make the f...

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Application Information

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IPC IPC(8): E02D19/18E02D17/04
CPCE02D19/18E02D17/04
Inventor 王洋陈向荣林百顺吴铭袁晨曦
Owner CHINA MCC20 GRP CORP
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