Construction method of large-diameter mixing pile suitable for high underground water level hard soil layer

Abstract

The invention relates to a construction method of a large-diameter mixing pile suitable for a high underground water level hard soil layer, which comprises the following steps: a pile casing hole site is dug at a pile site, and a pile casing is buried, so that the wall of the pile casing is vertical to the horizontal plane; a rotary drilling rig is used for drilling a formed hole to the designed elevation, pile core soil in the drilled hole is removed, and the pile core soil is backfilled into the drilled hole after being sieved; and the pile core soil in the drilled hole is stirred for four times through a stirring pile machine, and connected guniting is conducted during second-time stirring and fourth-time stirring. The rotary drilling rig is used for guiding holes, so that the subsequent stirring pile machine can drill smoothly; fine-grained soil is screened out from pile core soil excavated by the rotary drilling rig, and then the fine-grained soil is backfilled into the drill hole; the mixing pile machine is centered in place, a drill rod sinks to the bottom of a hole, guniting is conducted while stirring and rising are conducted, operation is repeated, even stirring is guaranteed, meanwhile, the stirring difficulty is effectively reduced, abrasion of a stirring rod is reduced, and the stirring efficiency is improved; and finally, the rod is lifted out of the hole to wait for solidification of the soil body, and the cement-soil mixing pile with good impermeability is formed.

Description

technical field [0001] The invention relates to the technical field of foundation pit support construction, in particular to a large-diameter mixing pile construction method suitable for hard soil layers with high groundwater levels. Background technique [0002] The foundation pit project is to ensure the safety and stability of the underground space formed by the excavation of the ground during the construction of the underground structure. The foundation pit project includes measures such as retaining structure, groundwater control and environmental protection. Groundwater is an important factor affecting the safety and stability of the foundation pit. . Because the cement-soil mixing pile has high strength, good integrity and anti-seepage, in order to ensure that the foundation pit is not affected by groundwater, water-stop measures are required for the foundation pit project, and the cement-soil mixing pile is often used as the foundation in soft soil areas. Water-stop...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a large-diameter mixing pile construction method suitable for hard soil layers with high groundwater levels, which solves the technical problems of difficulty in drilling, difficulty in stirring, and easy damage to the stirring rod

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