Pile forming method for jet grouting pile in flowing water sand layer

A technology of rotary jetting and piling, applied in sheet pile wall, construction, infrastructure engineering, etc., can solve the problem of passive water flushing, taking away, leakage of foundation pit, water-stop curtain failing to stop water and interception Groundwater and other issues to achieve the effect of improving the success rate and ensuring quality

CN113737784AInactive Publication Date: 2021-12-03GUANGZHOU CHEM GROUTING CO LTD CAS +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-12-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a pile forming method for a jet grouting pile in a flowing water sand layer. The pile forming method comprises the steps that S1, a geological drilling rig is adopted for drilling; S2, clay powder is adopted and mixed with efficient high-foaming bentonite, and first-time jet grouting jetting is conducted in a drilled hole; and S3, cement paste and water glass are adopted for conducting second-time jet grouting jetting in the drilled hole at the same time, the pressure of the second-time jet grouting jetting is smaller than that of the first-time jet grouting jetting, and the lifting speed of the second-time jet grouting jetting is larger than that of the first-time jet grouting jetting. According to the pile forming method, the second-time jet grouting jetting is adopted in the flowing water sand layer; the second-time jet grouting jetting is adopted in the same drilled hole, the clay powder and the bentonite paste of the first-time jet grouting jetting are used for stabilizing gaps between the sand layer and sand grains filling the sand layer firstly, and the sand layer is changed into a sand and soil mixture; and an efficient water reducing agent is added in the cement paste of the second-time jetting, the cement paste of the second-time jet grouting jetting can be prevented from being diluted or washed away or taken away by underground water before being solidified, the success rate of pile forming is increased, and the quality of the jet grouting pile is guaranteed.
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Description

technical field

[0001] The invention relates to a method for forming piles with rotary jetting, in particular to a method for forming piles with rotary jetting in dynamic water sand layers. Background technique

[0002] In construction, transportation and water conservancy projects, it is necessary to build basements or excavate trenches to build foundations; at this time, foundation pit support and water-stop curtains are required. Cast-in-situ piles are usually used for the support piles of deep foundation pits, and the water-stop curtain is usually used as a water stop around the cast-in-place piles with Ф600 mixing piles, large-diameter stirring piles, and three-axis stirring piles, or additional support between the cast-in-place piles. Two single-pipe or double-pipe rotary spraying are used as water stop for rotary spraying piles between piles. After the application, the seepage and impermeability of the cement-soil piles stirred by the stirring piles or the rotary gro...

Examples

Embodiment

[0027] see figure 1 , the present embodiment relates to a pile-forming method of jet-jet piles in dynamic water sand layers, comprising the following steps:

[0028] Construction preparation and technical disclosure: Before construction, the laying of temporary construction, water and electricity, equipment, pipelines, etc. required for construction should be completed. During the construction process, attention should be paid to the following technical requirements: single-pipe jet grouting should be used for jet grouting piles after the foundation pit has been excavated, and double-pipe jet jet jetting can be used for jet grouting piles when the foundation pit has not been excavated. It is 0.7MPa, because when using compressed air, the excavated foundation pit will be flooded with slurry, and the unfavorable factors will affect the safety of the foundation pit. Therefore, the excavated foundation pit should use single-tube rotary grouting piles; Ensure that every employee a...