A construction method of cast-in-situ piles for drilling concrete without water in dry operation

Abstract

The invention relates to a construction method of cast-in-place piles for drilling and pouring concrete without water, which adopts the rotary drilling and drilling dry operation method to implement drilling and cleaning, and pours concrete with the waterless method. The operation of pouring concrete with the waterless method The steps include: when pouring the first batch of concrete, the distance from the lower opening of the conduit to the bottom of the hole is 25cm to 40cm, and the depth of the conduit buried in the concrete is not less than 1m; during the concrete pouring process, the buried depth of the conduit is controlled to be not less than 3m; When the concrete is close to the pile top, increase the height of the funnel to ensure that the distance between the funnel and the design pile top is not less than 4m. The invention completely omits the mud system, reduces the consumption of mud raw materials and water resources, and obviously reduces the engineering construction cost. Moreover, the transportation of excavated muck is far lower than the cost of transportation and treatment of mud, so the cost of discharging and treating mud is also considerable. The temporary land occupation of the mud system is saved, especially in the case of small urban areas, and the effect is good. obvious.

Description

technical field [0001] The invention relates to a construction method of a bored cast-in-place pile, in particular to a construction method of a bored-drilled cast-in-situ pile with concrete poured without water. Background technique [0002] The current bored pile operation has two methods: mud retaining drilling and dry hole operation. The mud retaining drilling operation adopts the method of mud retaining, because the retaining layer can be formed to prevent the hole from collapsing, and the slag can be effectively discharged. Providing water pressure support and balancing earth pressure in the hole is a commonly used method at present. However, the method of mud wall protection still has many deficiencies, such as increasing the construction process, it needs to be equipped with mud pools, recovery pools, supply and return slurry pipelines, etc., and the site occupies a large area; the raw material for mud is mainly bentonite, and bentonite is in short supply as a raw ma...

AI Technical Summary

Problems solved by technology

[0003] However, the current dry hole operation usually uses a long auger drilling machine, which has great limitations (smaller diameter). The manual excavation pile and the concrete pouring pile need to be vibrated by a vibrator. In addition to increasing the labor cost, the operation under the hole too dangerous and extremely difficult

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