Pipe pile leading-hole construction method under boulder cluster geological condition

Abstract

The invention relates to a pipe pile construction method, in particular to a pipe pile leading-hole construction method under the boulder cluster geological condition. The pipe pile leading-hole construction method adopts a down-hole hammer drilling process, and dilled muck is forcibly discharged out through a spiral drill rod in a rotation mode and is completely removed by utilizing strong wind. The down-hole hammer drilling hole bottom is cleaned through air pressure for 2-3minutes and sediments are removed with lifting of the spiral drill rod after the depth of a drill hole reaches to the designed depth, and operation is stopped after detection shows that the hole depth and the sediment thickness are smaller than or equal to 50mm and meet the design requirements. When the sediment thickness is larger than 50mm, a down-hole hammer is put into the hole again to perform secondary hole cleaning till the actual requirement is met. The pipe pile leading-hole construction method under the boulder cluster geological condition is short in construction period, the construction cost can be saved by more than 10% under the same operating conditions, a stratum application range is wide, and the pipe pile leading-hole construction method is especially suitable for construction of landslide, instability and other complicated stratums. The pipe pile leading-hole construction method is strong in machine tool selectivity and low in field requirement and is especially suitable for mountains and other narrow and small fields.

Description

technical field [0001] The invention relates to a pipe pile construction method, in particular to a pipe pile lead hole construction method under the geological condition of a boulder group. Background technique [0002] At present, rotary drilling rigs, impact hammers, reverse circulation drilling rigs, and full-casing full-rotary drilling rigs are commonly used in the construction of pipe pile pilot holes. The shortcomings of insecure quality and complex construction system, especially the soil removal capacity of traditional drilling machines are completely dependent on the air flow of the air compressor. To enhance the soil removal capacity, a larger air compressor must be configured, resulting in increased construction costs. For the geological conditions of the boulder group, the traditional static pressure prefabricated pipe piles cannot penetrate the rock, the traditional blasting method cannot be used, and the manual digging method cannot be used. Contents of the ...

AI Technical Summary

Problems solved by technology

[0002] At present, rotary drilling rigs, impact hammers, reverse circulation drilling rigs, and full-casing full-rotary drilling rigs are commonly used in the construction of pipe pile pilot holes. The shortcomings of insecure quality and complex construction system, especially the soil removal capacity of traditional drilling machines completely depend on the air flow of the air compressor. To enhance the soil removal capacity, a larger air compressor must be configured, resulting in increased construction costs

For the geological conditions of the boulder group, the traditional construction of static pressure prefabricated pipe piles cannot penetrate the rock, and the traditional blasting method cannot be used, nor can the manual digging method be used.

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