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Method for treating soft foundition by fast 'high vacuum impacting dense, pile base' compound method

A treatment method and high-vacuum technology, which can be applied in basic structure engineering, soil protection, construction, etc., can solve the problems of low bearing capacity of pile foundations, large differences of each pile foundation, and large settlement after construction, so as to improve unit The effect of pile bearing capacity, increased drainage effect, and improved frictional resistance

Active Publication Date: 2008-01-02
SHANGHAI HARBOUR SOFT SOIL TREATMENT ENG CO LTD
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AI Technical Summary

Problems solved by technology

However, in a large number of projects, due to the deep thickness of the soft soil and the large difference in thickness, it is difficult to meet the design requirements for bearing capacity, post-construction or differential settlement by using the rapid "high vacuum compaction" soft foundation treatment method alone.
On the other hand, the pile foundation method (crushed stone, cement-soil pile, etc.) is also used for weak foundations. Due to the low friction resistance of the weak soil between the pile foundations, the bearing capacity of the pile foundation is extremely low, and the post-construction settlement is relatively low. Large, the difference of each pile foundation is large, and there are many hidden dangers in construction safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] The rapid "high-vacuum compaction and pile foundation" composite soft ground treatment method of the present invention, firstly, adopts well point pipes densely distributed in the soft soil (generally 1-3m interval), and the upper end of the well point pipes is connected to a vacuum pump with a horizontal pipe to evacuate. Actively reduce the water content of soft soil (pore pressure water), pull out the well point pipe, and use compaction (dynamic compaction or vibratory rolling) to reduce the soft soil pore ratio. The well point pipe is vacuumed and compacted several times (conventional 1 to 4 times), and then, fill the soft soil with gravel and compact it to form a pier, or use the immersed tube method to form a gravel pile, or use cement and soil to mix into a pile.

[0007] example:

[0008] This method is applied to a project of 100,000 m 3 The original design of ￠1.2 gravel piles for the oil storage tank, but after construction, the difference is large, the bear...

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Abstract

The invention relates to a fast 'high vacuum striking thickness, pile foundation' composite soft foundation processing method. Its features are densely setting well point pipe in soft soil; connecting it with vacuum pump by lying pipe to remove the well point pipe; striking thickness; repeating the cross action of well point pipe vacuum pumping and striking thickness for many times; filling crushed stones to strike to pillar, or adopting pipe sinking to form crushed stone pile, or stirring concrete to form pile to make the soft soil combine crushed stone pile / pillar or concrete pile to form composite foundation. The invention can effectively increase foundation bearing. And its working post or differential settlement is little.

Description

Technical field: [0001] The invention relates to a method for treating soft ground, in particular to a rapid "high vacuum compaction and pile foundation" composite soft ground treatment method. It is suitable for the treatment of large areas of weak foundations. It belongs to the technical field of foundation treatment. Background technique: [0002] At present, the treatment of large-area soft ground generally adopts the rapid "high vacuum densification" soft ground treatment method. The rapid "high vacuum compaction" soft foundation treatment method (patent number: ZL01127046.2) is to quickly achieve the soft foundation improvement in the shallow layer (10m) through several times of high vacuum combined with compaction (dynamic compaction or vibration rolling) Bearing capacity, the purpose of eliminating part of post-construction or differential settlement. However, in a large number of projects, due to the deep thickness of soft soil and the large difference in thickne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/046E02D3/08E02D3/10E02D27/16
CPCE02D3/08E02D3/10E02D3/046
Inventor 徐士龙
Owner SHANGHAI HARBOUR SOFT SOIL TREATMENT ENG CO LTD
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