Construction method and device for guide displacement pressure precast pile

Abstract

The invention discloses a construction method and device for a guide displacement pressure precast pile. The construction device comprises a spiral drill power head (1), a soil outlet (2), a multi-functional pile hammer (3), a pile driver (4), a chuck (5), a long spiral drilling tool (7), a precast pile bottom (8), a drill bit (9) and a spiral piece (10), wherein the drill bit (9) is a diameter-expanded drill bit. In the construction process, the drill bit (9) can expand outwards to spirally cut off the soil on the lower portion of the precast pile; after the construction, the drill bit (9) contracts so as to draw back smoothly. Because the construction method and device are adopted for construction, construction programs are simple, and the construction can be smoothly carried out on a hard stratum with great hardness.

Description

technical field [0001] The invention relates to a construction method and device for pressing prefabricated piles, in particular to a method and device for constructing prefabricated piles with pilot-discharged soil pressing which has simple construction procedures and can be constructed on hard soil layers with relatively high hardness. Background technique [0002] When the traditional prefabricated pile construction method encounters a hard soil layer with an N value greater than 30 and above, the construction technology and methods that need to be adopted are often inversely proportional to the economic benefits that can be obtained, that is, the investment is huge and the benefit is very small, especially It is often helpless when encountering dense sand, gravel layers, and strong weathered rock-soil layers, and construction operations cannot be carried out at all. Contents of the invention [0003] In view of the above problems, the main purpose of the present invent...

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Problems solved by technology

[0002] When the traditional prefabricated pile construction method encounters a hard soil layer with an N value greater than 30 and above, the construction technology and methods that need to be adopted are often inversely proportional to the economic benefits that can be obtained, that is, the investment is huge and the benefit is very small, especially It is often helpless when encountering dense sand, gravel layers, and strongly weathered rock-soil layers, and it is impossible to carry out construction operations at all.

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