Method for preventing slurry leakage and hole collapse of large-diameter deep-borehole cast-in-situ bored pile by casting curtain method

A technology of bored piles and grouting curtains, which is applied to sheet pile walls, buildings, and foundation structure engineering, etc. It can solve problems such as high cost, long time consumption, grout leakage or hole collapse, and achieve thorough treatment and plugging effects Good, the effect of preventing slurry leakage and hole collapse accidents

Active Publication Date: 2008-05-07
CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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Problems solved by technology

Conventional treatment methods have disadvantages such as time-consuming, h...

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  • Method for preventing slurry leakage and hole collapse of large-diameter deep-borehole cast-in-situ bored pile by casting curtain method

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Embodiment Construction

[0008] This embodiment is used to explain the claims of the present invention, and the protection scope of the present invention is not limited to the description of the following embodiments.

[0009] As shown in the accompanying drawings, grouting positioning rings 3 are arranged on the periphery of the steel casing 2, and the grouting positioning rings 3 can be provided with 1 to 4 circles in the plane, and 1 to 3 layers can be arranged at intervals on the facade. The grouting holes 1 are drilled at intervals along the circumference in the grouting positioning ring 3 .

[0010] The specific construction is as follows:

[0011] 1. Backfill the accident hole with sand to 1m above the location of the grout leakage or hole collapse;

[0012] 2. On the outer side of the steel casing 2, 2-3 grouting hole drill pipe positioning rings 3 are arranged. The positioning ring 3 is a ring concentric with the steel casing 2, and the diameter is 0.3-1m larger than the diameter of the stee...

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Abstract

The invention discloses a method of grout curtain to prevent mud leakage and hole collapse of the large diameter deep hole bored cast-in-place pile. A grouting locating ring is arranged on the outside of the steel casing of the bored pile. A plurality of holes are drilled along the circumference at intervals between the steel casing grouting locating ring and the grouting holes are injected with cement slurry. The slurry completely spreads and fills gaps and is fixedly connected with a loose permeable layer, which can form a high strength waterproof curtain. The method can solve the problems of the mud leakage and hole collapse of the large diameter deep hole bored cast-in-place pile. The cement slurry is injected into the loose permeable layer and is fixedly mixed with the loose permeable layer to fill gaps and form a ring of high strength stop water curtain. The invention has the advantages that plugging results are good, problems are solved completely, the problems of mud leakage and hole collapse will not happen again in subsequent construction, the construction speed is rapid, input is low, incident handling costs can be greatly reduced. Meanwhile, the method can be applied to prevent the incidents of mud leakage and hole collapse while loose permeable layers of silty sand, drift sand, pebble soil and other soil are drilled.

Description

technical field [0001] The invention belongs to a construction method for large-diameter deep-hole bored piles, and in particular relates to a method for preventing grout leakage and hole collapse of large-diameter deep-hole bored piles by a grouting curtain method. Background technique [0002] With the rapid development of bridge construction in our country, large-diameter deep-hole bored pile bridge foundations are widely used. Its construction is limited by on-site equipment and geological conditions. Steel casings often cannot be drilled deep into impermeable compact layers. When drilling in loose permeable layers such as silt, quicksand, and pebble soil, it is easy to leak slurry, such as the field mud index Poor control, fast drilling speed or failure to replenish grout in tidal areas will result in insufficient water head height in the hole, and even serious hole collapse accidents will occur. The routine treatment methods for large-diameter deep-hole bored piles to...

Claims

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Application Information

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IPC IPC(8): E02D5/62
Inventor 杨齐海王喜良高兴泽刘晓阳王鹤马永强周启辉张红涛张建兵贾卫中张继新
Owner CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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