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Method for carrying out water expelling and powder spray piling composite foundation ground

An operation method and technology of composite foundation, applied in the field of soft soil foundation treatment, can solve problems such as ground cracking, slow drainage speed, low efficiency, etc., achieve major economic and social benefits, accelerate strength growth, and save engineering investment.

Inactive Publication Date: 2004-04-21
SOUTHEAST UNIV
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Problems solved by technology

However, powder jetting piles are expensive, and the deep treatment effect is not good (the effective reinforcement depth is generally <15m), which limits the large-scale application of this method. On the other hand, unexpected problems often occur during the construction process, such as:
[0004] (1) When there is an empty surface, the construction of powder-sprayed piles will cause slope instability;
[0005] (2) Construction near existing structures will cause ground cracks and damage to structures;
[0006] (3) After construction, the powder-sprayed pile will suddenly sink, etc.
This method is simple and economical, but the drainage speed is slow, the construction period is long, and the efficiency is low

Method used

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  • Method for carrying out water expelling and powder spray piling composite foundation ground
  • Method for carrying out water expelling and powder spray piling composite foundation ground

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Embodiment Construction

[0030] The invention organically combines two independent soft soil foundation technologies, the drainage method and the powder spraying pile method. Firstly, the drainage board is set in the soft soil foundation to form the drainage and exhaust channel during the construction of the powder spraying pile, and then the powder spraying pile is embedded, and the water in the soft soil is discharged along the drainage board by using the lateral pressure during the construction of the powder spraying pile, and at the same time Through the action of expansion, splitting occurs, causing horizontal cracks in the soft soil, thereby increasing the permeability of the soil around the pile. Under the action of consolidation, the strength of the soil around the pile will increase with time; on the other hand, in the powder spraying During pile construction, due to the drainage and exhaust function of the drainage board, the powder-sprayed pile can be stirred evenly and the powder sprayed ca...

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Abstract

A method for reinforcing the soft foundation by draining water and using powder-spraying piles includes such steps as positioning the powder-spraying piles in such manner that the piles are longitudinally arranged at intervals and transversely arranged to form equilateral triangles, positioning the drainage plates between two adjacent piles arranged longitudinally, positioning draining ditches inclined between two piles, digging the draining ditches, filling sand in them, inserting the drainage plates into ground, forming piles, and spreading broken stone and sand layer on the ground.

Description

1. Technical field [0001] The invention relates to a method for strengthening soft soil foundation, which belongs to the technical field of soft soil foundation treatment. 2. Background technology [0002] Powder spraying pile is a method of using compressed air to transport powder solidified material, and through stirring blades, the solidified material and soft soil are mixed together to form cement-soil piles to strengthen the soft soil foundation. Since this method was invented by Swedish engineer Kjeld pans in 1967, it has been widely used in various soft soil foundation reinforcement projects such as railways, highways, municipal engineering, and ports and wharfs at home and abroad. Since the introduction of this method in our country in the late 1970s, it has also been popularized and applied in railways, highways, industrial and civil projects. [0003] A large number of engineering practices have shown that the powder spraying pile method has the advantages of simp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/34E02D19/20E02D27/12
Inventor 刘松玉
Owner SOUTHEAST UNIV
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