Construction method of reinforced concrete cast-in-place pile under complex geological conditions

Abstract

The invention relates to the technical field of building construction, in particular to a construction method of a reinforced concrete cast-in-place pile under complex geological conditions, which comprises the following steps: S1, leveling a site, and paying off a pile position; s2, hole forming and soil taking are conducted, and a steel casing is installed to the position X m away from the natural terrace; s3, slurry retaining wall construction; s4, rock entering, pipe pulling and hole cleaning; s5, placing a reinforcement cage; s6, concrete pouring; and S7, post-grouting, inspection and acceptance. The steel casing and slurry retaining wall cast-in-situ bored pile construction technology is adopted, the problems that under the complex geological conditions of the super-thick coal ash layer, a cast-in-situ pile is prone to hole collapse and drill burying, hole collapse due to vibration during rock entering, water source shortage, serious water leakage, poor retaining wall forming and the like are solved, the cost and the working intensity are greatly reduced, and the construction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of building construction, and more particularly, to a construction method of reinforced concrete cast-in-place piles under complex geological conditions. Background technique [0002] In view of the geological conditions of the deep mountain valleys and the fly ash backfill layer of the power plant, there are unfavorable conditions such as uneven geology and landforms of the original project, different elevations of the valley bottom, different rock mass strength, uneven thickness of the fly ash layer, and thick backfill thickness. At the same time, the fly ash layer has the disadvantages of uneven particle dispersion, loose structure, easy water permeability, easy collapse, and large filling coefficient. Through data comparison and analysis, the fly ash layer plays a negative wear resistance role in the stress of the pile body, while the fly ash layer plays a negative role in the stress of the pile body. Th...

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Problems solved by technology

[0002] In view of the geological conditions of the deep mountain valley and the fly ash backfill layer of the power plant, there are unfavorable conditions such as uneven geological landform, uneven elevation of the valley floor, uneven rock mass strength, uneven backfill thickness of the fly ash layer, and thick backfill thickness. At the same time, the fly ash layer has the disadvantages of uneven particle dispersion, loose structure, easy water permeability, easy landslide, and large filling coefficient. Through data comparison and analysis, the fly ash layer plays a role of negative friction resistance in the stress of the pile body, and the pulverized coal The substances contained in the ash have a corrosion effect on the steel bars in the pile, etc.

[0003] After multiple test piles using a single construction process, the construction unit's low cost, tight construction period and high-quality construction requirements cannot be met

Among them, the single construction process of all-steel casing can ensure the quality of the pile foundation, but the equipment required is high, costly, and uneconomical; the use of a single mud retaining wall is easy to collapse the hole and cause a large amount of water loss, which affects the safety of the dam body. Hidden dangers, unable to meet construction requirements

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