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.