Construction method of water-stop curtain for double high-pressure rotary grouting piles

A technology of high-pressure rotary jetting pile and water-stop curtain, which is applied in excavation, sheet pile wall, foundation structure engineering and other directions, can solve problems such as foundation that cannot meet construction requirements, improve water-stop reinforcement performance, reduce construction cost, and improve strength and the effect of impermeability

Inactive Publication Date: 2011-12-21
NO 4 ENG CO LTD OF CCCC FIRST HARBOR ENG CO LTD
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AI Technical Summary

Problems solved by technology

Construction of water-stop curtain with a foundation pit depth of -60m, foundation reinforcement that cannot meet the construction requirements with conventional construction methods

Method used

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  • Construction method of water-stop curtain for double high-pressure rotary grouting piles
  • Construction method of water-stop curtain for double high-pressure rotary grouting piles

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Embodiment Construction

[0017] The construction method of the double-high-pressure rotary grouting pile water-stop curtain of the present invention will be described in conjunction with the accompanying drawings and embodiments.

[0018] The double-high-pressure rotary grouting pile water-stop curtain construction method of the present invention is suitable for deep foundation pit water-stop curtain or foundation reinforcement in soil layers with a depth of -30 to -60 m, and the method includes the following steps:

[0019] (1) Waterproof curtain construction

[0020] Firstly, the geological drilling rig is used to construct the high-pressure jet-grouting piles with interval-by-pipe-jumping pilot holes, and then construct part of the pilot holes between the jet-grouting piles in the pilot holes to form the first row of interlocking jet-grouting pile continuum. The method is to construct multiple rows, which can be two, three or more rows. The number of rows is determined by the soil type, compactness...

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Abstract

The invention provides a method for constructing a water-stop curtain of a double-high-pressure rotary grouting pile, which is suitable for a water-stop curtain or foundation reinforcement of a deep foundation pit in a soil layer with a depth of 30 to 60 m. The method includes the following steps: construction of a water-stop curtain; Selection of design parameters; selection of dual high-pressure jet grouting piles and construction parameters. The effect of the invention is that the double-high-pressure rotary spraying method increases the slurry pressure on the basis of the traditional triple-tube rotary spraying method, and sprays and punches the soil body again to form a larger diameter and fill. It solves the technical problem that traditional techniques cannot form piles in 40-60m ultra-deep foundation treatment, and forms a vertical water-stop curtain through interlocking piles, which has been successfully applied in deep foundation pit anti-seepage, water-stop and foundation reinforcement. The performance of water stop reinforcement in ultra-deep foundation treatment is improved, the strength and impermeability of the pile body are improved, and the construction cost is reduced.

Description

technical field [0001] The invention belongs to the construction method of double high-pressure rotary grouting pile water-stop curtains for foundation pit water-stop, and is mainly used for foundation reinforcement and stop water-sealing sections with rich groundwater such as gravel and riprap, sand layers, silt, and silt. Water curtain construction. Background technique [0002] With the development of underground space, foundation pits are gradually developing towards deep and large foundation pits. Deep and large foundation pits of 20-30m are not uncommon. In areas with abundant groundwater, such as Shanghai and Tianjin, the depth range of foundation pits is greatly affected by groundwater, and foundation pits are water-stopped. The curtain must effectively isolate the first and second layers of pressurized water. [0003] According to the geological survey report, the required depth of the water-stop curtain reaches -30~-60m, and the ordinary grouting method is not sui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/18E02D17/02E02D5/46E02D5/18
Inventor 樊听龙刘国强王广建张士友王建平
Owner NO 4 ENG CO LTD OF CCCC FIRST HARBOR ENG CO LTD
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