Foundation pit side slope sandy soil drainage method

A technology for sandy soil layer and foundation pit edge, applied in the field of infrastructure construction, can solve problems such as poor drainage effect, extended construction period, slope instability, etc., and achieve the effect of simple and convenient treatment of quicksand, reduced energy consumption, and less investment

Inactive Publication Date: 2010-06-23
CHINA MCC20 GRP CORP
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AI Technical Summary

Problems solved by technology

The burial depth of the rainwater drainage pipe is exactly in the sand layer. Because the sand layer is rich in water and has seepage fluidity, after the excavation of the slope, the water in the sand layer will form quicksand and cause slope instability.
For this reason, people use wooden piles to fix the foundation pit and use sand bags to absorb the water discharged from the sand layer. This method not only has poor drainage effect, but also prolongs the construction period and is costly.

Method used

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Embodiment Construction

[0015] A method for draining the sandy soil layer of a foundation pit slope, comprising:

[0016] Step 1, making the filter tube;

[0017] Step 2, burying the water filter pipe; excavating to the elevation of the sand layer, burying the filter pipe made in step 1 in the sand layer of the slope, and connecting the filter pipe to a vacuum pump;

[0018] Step 3, turn on the vacuum pump: turn the pump to drain water;

[0019] Step four, continue to dig the subsoil.

[0020] Specifically, the steps include:

[0021] Filter tube production:

[0022] Use Φ50PVC plastic pipe, drill Φ12mm seepage holes on the pipe wall with a spacing of 500mm, arranged in a plum blossom shape, and the porosity should be greater than 15%. There are two layers of filter screens on the outside of the pipe wall, and the inner filter screen adopts 30-80 mesh Nylon mesh, 5-mesh nylon mesh used for the outer filter, fastened with iron wire every 500mm.

[0023] Burying of filter pipes:

[0024] When dig...

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PUM

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Abstract

The invention relates to foundation construction field, in particular to a sand soil drainage method for foundation pit side slope. The foundation pit side slope sandy soil drainage method includes that: step 1, filter pipe fabrication; step 2, water filter pipe embedment; the foundation pit is excavated to the scale height of the sand layer, and the filter pipe fabricated in step 1 is embedded in the sandy interlayer of the side slope and is communicated with a vacuum pump; step 3, the vacuum pump is started: the pump operates to drain water; step 4, the lower soil is continuously excavated. The invention can utilize vacuum negative pressure principle to enable the vacuum dewatering filter head to be transversely laid in the quicksand layer for quickly absorbing the effluent water of the sandy interlayer, is convenient, simple and quick in treating quicksand, and has high construction efficiency.

Description

technical field [0001] The invention relates to the field of foundation construction, in particular to a soil layer drainage method for foundation pit slopes. Background technique [0002] Many coastal areas in our country have reclaimed land from the sea, transforming the tidal flats between the land and the sea into land that can be used by industry and agriculture. Among them, in road construction, it is necessary to arrange rainwater drainage pipes underground. Usually, under the road surface in such areas are backfilled muck layer, sand layer and silty clay layer in sequence. The burial depth of the rainwater drainage pipe is exactly in the sand layer. Because the sand layer is rich in water and has seepage fluidity, after the excavation of the slope, the water in the sand layer will form quicksand and cause slope instability. For this reason, people adopt wooden piles to fix on the edge of the foundation pit and use sand bags to absorb the water discharged from the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D17/20E02B11/00
Inventor 丁诚
Owner CHINA MCC20 GRP CORP
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