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Apparatus and method for collapsible loess combined with lime-soil compaction pile and CFG rigid pile

A technology of lime-soil compaction piles and collapsible loess, which is applied in the direction of sheet pile walls, buildings, and foundation structure engineering, can solve the problems of poor adaptability in local areas, and achieve simple structure, light structure, and wide application range Effect

Active Publication Date: 2015-12-09
CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, traditional foundation treatment methods such as dynamic compaction, gravel pile compaction, and tamping (flushing) expansion piles are generally used for deep collapsible loess foundations. These methods can significantly eliminate collapsibility and improve loess bearing capacity. It has strong adaptability to large-area foundation treatment, but it is not very adaptable to the reinforcement requirements of high bearing capacity and low settlement in local areas. How to eliminate loess collapsibility and provide High bearing capacity and economical foundation is a problem that needs to be solved in some designs

Method used

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  • Apparatus and method for collapsible loess combined with lime-soil compaction pile and CFG rigid pile
  • Apparatus and method for collapsible loess combined with lime-soil compaction pile and CFG rigid pile
  • Apparatus and method for collapsible loess combined with lime-soil compaction pile and CFG rigid pile

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specific Embodiment approach

[0022] The device for joint processing of collapsible loess by lime-soil compaction pile and CFG rigid pile of the present invention, its preferred embodiment is:

[0023] It includes a plurality of lime-soil compaction piles arranged in the collapsible loess area to be treated, and a CFG rigid pile is arranged in the pile body of the lime-soil compaction pile, and the pile diameter of the lime-soil compaction pile is larger than the CFG rigid pile pile diameter.

[0024] The lime-soil compaction pile is made of lime-soil filler, and the CFG rigid pile is made of concrete.

[0025] The upper pile body of the CFG rigid pile is provided with a reinforcement mesh.

[0026] The pile spacing of the lime-soil compaction piles is greater than or equal to 3 times the pile diameter of the CFG rigid pile.

[0027] The pile bottom of the lime-soil compaction pile is the bottom of the collapsible loess, and the pile bottom of the CFG rigid pile is flush with the pile bottom of the descr...

specific Embodiment

[0039] Such as Figure 1 to Figure 6 Shown:

[0040] It includes the following steps: step 1, the foundation of the collapsible loess 1 area to be treated is cleaned and leveled and impact-rolled; The inner filler is punched and rammed in layers with a column hammer to form a compacted pile; step 3, a long auger drill is arranged on the compacted pile 2, and a hole is drilled in the compacted pile body to the design depth of the CFG rigid pile 3, and the mixture is poured into the pile after the hole is formed. CFG rigid pile 3.

[0041] Step 1 includes sub-steps such as cleaning and leveling, impact rolling pretreatment, etc.; Step 2 includes arranging compaction pile positions, placing compaction pile equipment in place, drilling, drilling inspection, filling making and filling in holes, and column hammer division. Sub-steps such as layer ramming, removal of construction equipment, pile detection of compacted piles, etc.; step 3 includes long auger drilling rig in place, d...

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Abstract

The invention discloses a lime-soil compaction pile and CFG rigid pile combined device and method for disposing collapsible loess. The device comprises multiple lime-soil compaction piles arranged in a collapsible loess area to be disposed, wherein CFG rigid piles are arranged in lime-soil compaction pile bodies, and the pile diameter of each lime-soil compaction pile is larger than that of each CFG rigid pile. The method comprises the steps of pre-disposing the collapsible loess area to be disposed; then arranging the lime-soil compaction piles at the designed positions, adopting an immersed tube piling machine to perform hole forming till the designed depth is reached, filling lime-soil padding into holes and using a column hammer to ram the lime-soil compaction piles in a layered mode; using a long spiral drilling machine to performing drilling in the lime-soil compaction pile bodies till the designed depth of the lime-soil compaction piles is reached, and pouring concrete in the holes to form the CFG rigid piles. The collapsible loess foundation treatment quality can be remarkably improved, engineering safety can be ensured, engineering investment can be remarkably reduced, and the lime-soil compaction pile and CFG rigid pile combined device is reasonable in design, simple in structure, safe, reliable and well-adapted.

Description

technical field [0001] The invention relates to a foundation reinforcement treatment technology, in particular to a device and method for jointly treating collapsible loess with a lime-soil compaction pile and a CFG rigid pile. Background technique [0002] As a common geology, loess widely exists in my country, especially in Northwest China. The collapsibility of loess refers to the significant subsidence phenomenon caused by the rapid destruction of the structure after being soaked in water under a certain pressure of loess (including soil self-weight pressure and external pressure). Loess with collapsibility is called collapsibility loess , Collapsible loess can be divided into self-weight collapsible loess and non-self-weight collapsible loess. When building on collapsible loess foundations, the possible damage to the project due to additional settlement caused by collapsibility must be considered. Therefore, before the construction of the project, an appropriate founda...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D27/34E02D5/34
Inventor 张立青李闻徐惠纯陈卓罗九林杨永强
Owner CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP CO LTD
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