Construction method of composite pile

Abstract

A construction method of a composite pile comprises the steps of (1), sinking a steel sleeve into the center soil layer of a pile position in a vibrating mode or a hammering mode or a static pressure mode, wherein the diameter of the steel sleeve is larger than the diameter of a core pile by 10-80 cm, and the maximum length of the steel sleeve is 40 m; (2), taking out soil bodies in the steel sleeve or below the steel sleeve by a certain depth through a long auger or a rotary drilling rig or a grab bucket; (3), spraying cement paste and gas to the soil layer at the lower portion of the steel sleeve through a speed-variable agitator, agitating the soil and the cement paste to form uniform pasty cement soil at the same time and agitating the soil within the range of 1-3 meters at the pile tip repeatedly, wherein the number of times of vertical agitation is not smaller than 4; (4), implanting the rigid core pile into the steel sleeve in an inserting mode or a vibrating mode, wherein the pasty cement soil overflows and fills the portion between the rigid core pile and the steel sleeve in the implanting process of the rigid core pile, pulling out the steel sleeve before initial setting of the cement soil, and forming the composite pile after the pasty cement soil is hardened. According to the construction method, in the pile implanting process, mud discharging and soil squeezing effects are avoided.

Description

technical field [0001] The invention relates to the field of building foundation engineering, in particular to a construction method of a composite pile. Background technique [0002] At present, the construction method of the composite pile with the outer layer of cement soil and the inner core of high-strength pipe piles that has been publicly used in China can be divided into two types according to the way of forming cement soil: one is to form cement soil in the form of drilling and spraying grout, Such as the static drilling and rooting pile construction method invented by Ningbo Zhedong Building Materials Group, a method for drilling prefabricated composite piles disclosed in Chinese Patent Application No. 200510009711, and another method for forming cement soil by high-pressure rotary spraying or deep mixing method, such as Chinese patent Application No. 200710113491 discloses a composite pile and its construction method, and Chinese patent CN102127910B discloses a co...

AI Technical Summary

Problems solved by technology

The above two construction methods are to form cement soil slurry from the ground surface and then implant core piles, which will inevitably produce excess cement slurry or soil squeezing effect, resulting in waste of resources, environmental pollution and environmental damage

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