Construction device and construction method for deep or ultra-deep rock-embedded precast pile

Abstract

The invention discloses a construction device and construction method for a deep or ultra-deep rock-embedded precast pile and relates to the technical field of precast pile construction. The construction device comprises a full cylinder drilling machine, a non-polished cylinder or a plum-blossom-shaped cylinder, a drill rod, a drill bit and a grout spraying nozzle. The full cylinder drilling machine is connected with the non-polished cylinder or the plum-blossom-shaped cylinder and the drill rod. The drill rod is connected with the drill bit. The drill bit is connected with the grout spraying nozzle. The construction technique used for the deep or ultra-deep precast pile in soft soil areas can also be used for construction of a deep or ultra-deep rock-embedded precast pile comprising a slightly-weathered, moderately-weathered or hard underlying stratum foundation, soil sampling is not needed in the construction process, the construction speed is high, hole collapse and hole shrinkage are avoided, slag in holes does not need to be removed, the side form resistance of a soil body and the end resistance of bed rocks can be brought into full play, the pile body strength of the precast pile is improved, and the bearing capacity of a single pile is improved substantially; meanwhile, the construction speed of a finished pile can be increased substantially, industrial production is facilitated, and the construction cost is reduced; and furthermore, deep, ultra-deep or rock-embedded cast-in-place piles in the soft soil areas can be replaced to a certain extent.

Description

Technical field [0001] The invention relates to the technical field of precast pile construction, in particular to a deep or ultra-deep rock-socketed precast pile construction equipment and construction method. Background technique [0002] In the riverside and coastal areas, soft soils with low strength, high water content, high compressibility, low permeability, and large thickness are widely distributed, and their physical and mechanical properties are poor. The pile foundations of high-rise or super high-rise buildings are usually buried deeply. Prefabricated piles can be difficult to sink and break easily. Therefore, high-rise or super-high-rise pile foundations usually use cast-in-place pile technology. During the construction of ordinary cast-in-place piles, a large amount of mud will be generated, easy to collapse and shrink holes, and it is difficult to settle at the bottom of the hole. For cleaning, it is difficult to ensure the quality of piles in soft soil, and the co...

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a deep or ultra-deep rock-socketed prefabricated pile construction equipment and construction method to overcome the soft soil with low strength, high water content, high compressibility, low permeability and large thickness. The prefabricated pile sinking method is difficult and the prefabricated pile is easy to break. Using the ordinary cast-in-place pile method will generate a large amount of mud during the construction process, which is easy to collapse holes and shrinkage holes. The quality of the pile, while the construction of the cast-in-place pile with the original shape of the casing needs to take soil. When the soil is in a soft plastic or flow plastic state, it is difficult to successfully fetch the soil, the sediment in the casing is difficult to clean, and the construction speed is slow.

Images