Construction method of all casing precessing isolation pile

Abstract

The invention discloses a construction method of all casing precessing isolation pile. The method comprises the following steps: downwardly and vortically placing a steel casing by a full-gyratory jacketing machine and removing various underground barriers while downward drilling of the steel casing, positively rotating an inner spiral drill pipe and reversely rotating an outer steel casing in thedrilling process to borrow soil, discharging soil carried by the rotation of the spiral drill from soil discharge port at the upper part of the steel casing, rotating and dropping a first steel casing section, positively rotating to lift up the spiral drill pipe to carry the residual soil in the steel casing, then adding another steel casing and another spiral drill pipe, repeating the steps until the design elevation is reached. In the method, the steel casing is placed downwardly by full-gyratory cutting, which causes low disturbance to the surrounding soil mass, results in higher work efficiency and has the capacity of directly removing underground barrier. The method is especially effective for removing complicated barriers and protection of periphery of structures.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a construction method for retaining piles surrounding a foundation pit, in particular to a construction method for a full-sleeve screw-in isolation pile for isolation pile construction in complex geological environments, especially close to important underground structures . Background technique [0002] At present, isolation piles, surrounding piles or mixing piles are usually set up when foundation pit construction is carried out around important underground structures (such as subway tunnels and highway tunnels) and protected buildings, and bored piles are mainly used for implementation. This traditional craft is relatively mature, and it is feasible to apply it in areas with a certain distance from underground structures and historical building foundations. However, the bored pile is limited by its own equipment and technology. It is difficult to en...

AI Technical Summary

Problems solved by technology

However, the bored pile is limited by its own equipment and technology. It is difficult to ensure the verticality of the hole and the quality of the pile in an environment with extremely complex underground obstacles. During the pile formation process, hole collapse disturbances occur due to poor soil conditions. It is inevitable that the soil will affect the safety of structures

Therefore, when traditional bored piles are used to isolate and protect important structures or to construct uplift piles at close range, it is very likely that the purpose will not be achieved, but serious adverse effects will be caused by the disturbance of the soil due to the collapse of the hole.

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