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

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. Conventional treatment methods for grout leakage and hole collapse accid...

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