Construction method for expanded reinforced cast-in-situ bored pile with hydraulic extruding and expanding combined bag grouting pile body

Abstract

The invention relates to a construction method for an expanded reinforced cast-in-situ bored pile with a hydraulic extruding and expanding combined bag grouting pile body. The construction method is characterized by comprising the steps that after drilling is finished, a manufactured reinforcement cage and hydraulic equipment are placed in a drilled hole, a bag grouting extruding and expanding body is wrapped with a bag, then the reinforcement cage is placed in the hole to be subjected to hydraulic extruding and expanding, and finally bag grouting and concrete pouring are carried out. The construction method comprises the steps of drilling and forming the hole, manufacturing the reinforcement cage, installing a steel sleeve, an expansion plate, the bag and the like, installing the hydraulic equipment, lowering the reinforcement cage, hydraulic extruding and expanding construction, grouting the bag, pouring the concrete, and cleaning and maintenance of the hydraulic equipment. The extruding and expanding body can be unfolded in a corresponding soil layer, and reinforcing ribs are arranged in the extruding and expanding body, so that the strength of the extruding and expanding body and the interface strength between the extruding and expanding body and a pile body are improved, the contact area between the extruding and expanding body and the soil body is increased, the uplift bearing capacity is improved, the length and the distance of the cast-in-place pile are reduced, the cost is reduced, and resources are saved.

Description

technical field [0001] The invention relates to the technical field of cast-in-situ pile construction in pile foundation engineering, in particular to a construction method for expanding and reinforcing bored cast-in-place piles with hydraulic extrusion combined with bladder bag grouting pile body. Background technique [0002] Uplift piles are widely used in anti-floating of large basements and anti-uplift of high-rise buildings (structures). With the widespread application of uplift pile construction technology, more and more people pay attention to the mismatch between pile strength and uplift bearing capacity and soil friction. The pile length and design uplift bearing capacity of a single pile are calculated based on the investigation data. For areas where the friction bearing layer is silty clay and soft soil with high water content and low permeability, the design scheme of large-diameter cast-in-situ piles is generally adopted for the uplift-resistant piles. The pil...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the existing problems in the construction of existing enlarged and reinforced bored piles, and propose a construction method for enlarged and reinforced reinforced bored piles with hydraulic extrusion combined with bladder bag grouting

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