Construction method of cast-in-situ bored pile under special geological conditions

Abstract

The invention provides a construction method of a cast-in-situ bored pile under the special geological conditions, and relates to the technical field of pile foundation construction. The construction method of the cast-in-situ bored pile under the special geological conditions comprises the steps of burying a pile casing; performing rotary drilling to form a hole in a special stratum, wherein chemical slurry in the hole is at least 1m higher than an underground water level in the drilling process, the chemical slurry is prepared from the following components in parts by mass: 18 to 150 parts of polymer, 6 parts of dispersing agent and 1000000 parts of water, the special stratum mainly comprises cohesive soil and contains a small amount of sand and tuff fragments, local tuff fragments are distributed in a concentrated mode, and the soil texture structure is loose; and cleaning the hole. Compared with common bentonite slurry, the special polymer slurry adopted by the invention has the advantages that the flocculent precipitation speed is high, the reaming coefficient is small, the vertical bearing capacity characteristic value of a single pile is increased by about 11 percent, the comprehensive cost of the single pile is low, the polymer slurry can be selected for wall protection and hole forming through field trial preparation under similar geological conditions, and the engineering cost can be saved; and in the construction process, the drilling hole-forming operation efficiency is improved, and the conditions of work delay and construction period delay do not occur.

Description

Technical field [0001] The present invention relates to the field of pile foundation construction, and more particularly to a construction method of drilling and infusion pile under special geological conditions. Background technique [0002] When the shallow foundation on the natural ground cannot meet the bearing capacity or settling requirements, consider the relatively good soil bearer using the base, and the pile foundation is high due to the high load capacity, the strength is high, and the load is often transmitted to the depth. The formation is effective in which the mud wall infusion pile is widely used as a common formation process. When the pillar is applied, the prepared mud can reduce the wear of the drill, cool the drill temperature during the cycle, while the various particles formed when the hole can be formed, reduce the bottom of the hole, and The slurry in the stranded pile holes will play a balance hole wall pressure to prevent the collapse of the holes. [00...

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a construction method for bored piles under special geological conditions, which solves the technical problem of reducing the bearing capacity of piles caused by preparing mud by self-made slurry under special geological conditions

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