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Construction method for ultra-deep vibroflotation gravel pile of complicated stratum

A technology of vibrating gravel piles and complex strata, which is applied in the fields of soil protection, infrastructure engineering, construction, etc. It can solve the problems of slow construction speed, achieve the effects of improving construction efficiency, speeding up construction progress, and reducing damage rate

Active Publication Date: 2014-03-12
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a construction method for ultra-deep vibratory gravel piles in complex strata in view of the defects and deficiencies in the above-mentioned prior art. Construction problems such as "holding holes", slow construction speed, and "sequence holes" encountered in the construction process of complex formations with sand-containing silt-fine sand interlayers (interbeds) and round gravel-containing silt-fine sand interlayers (interbeds)

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  • Construction method for ultra-deep vibroflotation gravel pile of complicated stratum

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Embodiment approach

[0031] As a preferred embodiment of the present invention, comprise the following steps:

[0032] (1) Construction preparations;

[0033] (2) Hole making;

[0034] (3) clear hole;

[0035] (4) filler;

[0036] (5) Pile formation: Repeat step (4) until the filler is densified to the top of the pile.

[0037] In the above-mentioned step (2), it is aimed at complex formations with a depth exceeding 15-20m of medium-coarse sand with silt-fine sand interlayer (interbed) and round gravel with silt-fine sand interlayer (interbed).

[0038] The power of the vibrator used in the step (2) is 130kW~180kW.

[0039] The volume of the air compressor used in the gas cooperation method in the step (2) is 7-12m3, and the air pressure at the jet orifice is 0.2-0.8Mpa.

[0040] In the step (2), the pore-forming current of the vibratory impactor is 110-190A, and the pore-forming water pressure is 0.2-0.8Mpa.

[0041] In the case of collapsed holes in the above step (2), clay mud slurry can ...

Embodiment 2

[0056] As a specific application example of the present invention, its implementation mode is: the Ruili sub-transportation compressor station project of the China-Myanmar natural gas pipeline project (domestic section) includes three 5×104m3 storage tanks with a diameter of 60m. According to the survey report, the main soil layers from top to bottom are: ①clay, plastic, layer thickness 0.50-4.10m; ②medium-coarse sand, loose, interbedded with silt and gravel, layer thickness 1.50-8.70m; ③round gravel , medium-dense, layer thickness 0.50-4.30m; ④ medium-coarse sand, medium-dense, thin layer with silt and gravel sand, exposed layer thickness 0.50-9.50m; ⑤ medium-coarse sand, dense, local pebbles, gravel, Silt interlayer, exposed layer thickness 1.00-35.10m. The buried depth of the stable groundwater level of the site is 0.50-1.40m. The peak ground acceleration value of the proposed site is 0.20g (corresponding to an earthquake with a basic intensity of 8 degrees), and ②medium-c...

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Abstract

The invention discloses a construction method for an ultra-deep vibroflotation gravel pile of a complicated stratum. The method comprises the following steps: (1) doing construction preparation work; (2) carrying out pore-forming; (3) cleaning pores; (4) filling; (5) forming a pile: repeating the step (4) until materials are densely filled to a pile block. According to the construction method for the ultra-deep vibroflotation gravel pile of the complicated stratum, the construction problems of a large-power vibroflotation device, including hole embracing, slow construction speed, hole stringing and the like in the construction process of the complicated stratum of a medium-coarse sand powder-containing fine sand interlayer (an interbedding) and a round gravel powder-containing fine sand interlayer (the interbedding) with the size which is more than 15m, even more than 20m can be solved. Compared with a traditional construction method, the construction progress can be accelerated effectively, the construction efficiency is improved, the fault rate of equipment is reduced, and the cost is reduced.

Description

[0001] technical field [0002] The invention relates to a foundation treatment construction method. In particular, the invention relates to a construction method of an ultra-deep vibrating gravel pile under the action of a high-power vibrating impactor. Background technique [0003] A lot of researches have been done on the construction of vibrating gravel piles at home and abroad, and some successes have been achieved. However, there are very few complex formations with medium-coarse sand containing silt-fine sand interlayer (interbed) and round gravel containing silt-fine sand interlayer (interbed) treated with gravel piles at a depth exceeding 15m or even 20m or more. Due to the high density of medium-coarse sand and round gravel in ultra-deep formations, the vibration force of vibro impactors less than 130kW is small, and the hole-making speed is slow or even unable to meet the hole-making requirements. When dealing with piles, a high-power vibro impactor of 150kW or ...

Claims

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Application Information

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IPC IPC(8): E02D3/08
Inventor 王遂泸周洲张俊鲜志唐华卿自强李思薇王欣郭小燕文华刘华强张玲玲
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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