Large-diameter rotary digging pile construction technology for ultra-deep dumped unconsolidated soil bodies

A construction technology and soil consolidation technology, which is applied in foundation structure engineering, sheet pile walls, earth cube drilling and mining, etc., can solve the problems of low backfill density, poor backfill effect, short backfill time, etc., and achieve good construction image and easy construction Alignment, high security effect

Active Publication Date: 2012-10-31
中建五局第三建设有限公司 +1
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AI Technical Summary

Problems solved by technology

Regarding the geological structure of the backfill area, there are a large amount of sandstone, mudstone, quality clay, and silty clay in the backfill, and the base is mudstone and sandstone. The backfill effect of the high backfill area is poor, mainly manifested in: low backfill compactness; large backfill There are many boulders; the backfilling time is short, and the soil is not consolidated, so it is difficult to drill
During the construction of rotary excavation piles, a large number of hole collapses occurred, which caused difficulties in the construction of rotary excavation piles and could not be carried out normally.

Method used

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  • Large-diameter rotary digging pile construction technology for ultra-deep dumped unconsolidated soil bodies

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Embodiment Construction

[0044] The following structural drawings and specific embodiments will further illustrate the present invention.

[0045] Refer to Figure 1, the construction process of large-diameter rotary-dug piles for ultra-deep throw-filling of unconsolidated soil. The main points of operation are: 1. The rotary-dug piles should not be equipped with expansion heads as much as possible, because construction is very difficult, and inspection and acceptance are even more difficult; 2. , Advance exploration: Each rotary excavation pile shall be surveyed in advance to find out the geological conditions, and then calculate the excavation depth before implementing the rotary excavation pile; 3. According to the site geological conditions and pile diameter, select a drilling rig with appropriate power. There are many lone rocks in the project. In order to avoid the phenomenon of drill bit sticking, SR420R, SR360R and SR280R rotary drilling rigs are used. The steps are as follows:

[0046] (1) Pil...

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Abstract

The invention discloses a large-diameter rotary digging pile construction technology for ultra-deep dumped unconsolidated soil bodies, wherein low grade concrete is reinjected in a hole collapse section for countering pressure in the rotary digging pile construction process, so that the collapse of soil bodies around a pile hole is prevented; after the concrete is finally solidified and reaches a certain strength, the peripheral soil bodies are solidified, and a rotary digging operation is carried out in site for excavating soil, so that the reinjected concrete forms a protective wall; and the operations are carried out in circles till the hole is formed. The large-diameter rotary digging pile construction technology disclosed by the invention is a construction technology capable of carrying out large-diameter rotary digging pile construction on the unconsolidated soil bodies.

Description

technical field [0001] The invention relates to a construction technology of a rotary-dig pile, in particular to a construction technology of a large-diameter rotary-dig pile for ultra-deep throwing filling of unconsolidated soil. Background technique [0002] Pile depths greater than 16m are ultra-deep pile holes. Regarding the geological structure of the backfill area, there are a large amount of sandstone, mudstone, quality clay, and silty clay in the backfill, and the base is mudstone and sandstone. The backfill effect of the high backfill area is poor, mainly manifested in: low backfill compactness; large backfill There are many boulders; the backfilling time is short, and the soil is not consolidated, so it is difficult to drill. During the construction of the rotary excavation pile, a large number of hole collapses occurred, which caused difficulties in the construction of the rotary excavation pile and could not be carried out normally. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/36E02D15/04E21B7/02E21B7/04
Inventor 何昌杰谢小红彭明祥杨爱兵
Owner 中建五局第三建设有限公司
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