Cast-in-place pile synchronous casing hole-forming constructing method

Abstract

The invention belongs to the technical field of building engineering and particularly relates to a cast-in-place pile synchronous casing hole-forming constructing method. The method comprises the following steps of 1, pile position lofting; 2, synchronous follow-up installation; 3, pile machine positioning; and 4, hole forming and hole cleaning. The cast-in-place pile synchronous casing hole-forming constructing method has the beneficial effects that when the stratum has giant-grained soil layers such as erratic boulder, rock block and pebbles, the problems of verticality deflection and drill clamping through rock caving can be effectively solved, the construction speed is high, and the cost is low; for strata such as loose backfill soil and sand layers, the occurrence of pile body hole collapse phenomena can be effectively controlled, and the concrete cost is effectively reduced; the slurry making wall protection is not needed, a synchronous follow-up steel sleeve can effectively prevent the hole collapse, meanwhile, the synchronous follow-up steel sleeve can be embedded into the rock layer in time, an effect of preventing underground water from leaking into the pile holes is realized, and no water exists in the holes after the hole forming; and the method has the characteristics that the construction quality is reliable, the hole forming speed is high, the hole forming rate is high, the adaptability is high, and the like, the noise is low, the pollution is little, and the environment is protected.

Description

technical field

[0001] The invention relates to a construction method for synchronously following pipes with cast-in-place piles, which belongs to the technical field of construction engineering, and is suitable for loose gravel sand layers, thick backfill soil layers, huge grain soil layers with boulders, boulders, pebbles, etc., hard The invention relates to the technical field of large-diameter rock-socketed cast-in-situ piles forming holes in strata such as hard rocks. Background technique

[0002] At present, there are two types of hole-forming methods in the construction of cast-in-situ pile foundations in my country: sinking tube forming holes and drilling holes. Immersed tube hole forming is limited by immersed tube equipment and geological conditions, and the pile length and diameter cannot meet the large design bearing capacity requirements. There are generally methods of drilling holes such as impact, long and short spirals, positive and negative circulation, rot...