Construction method for conducting high-pressure jet grouting hole guiding firstly and then conducting grouting-assisted jacked pile sinking

Abstract

The invention discloses a construction method for conducting high-pressure jet grouting hole guiding firstly and then conducting grouting-assisted jacked pile sinking, belongs to the field of foundation construction, and aims at providing the construction method solving difficult jacked pile sinking and bearing capacity instability caused by water guiding. According to the technical scheme of theconstruction method, the construction method is characterized in that high-pressure jet grouting hole guiding construction and static-pressure pile sinking construction are included, the high-pressurejet grouting hole guiding construction includes the step that hole drilling is in place, the step of high-pressure jet grouting drilling, the step of drill lifting and like, and static-pressure pilesinking includes the step that a static pressure pile machine is in place, the step of the first stage of static-pressure pile sinking, the step of the second stage of static-pressure pile sinking, the step of the third stage of static-pressure pile sinking and the like. According to the construction method, a pile position soil layer is disturbed through high-pressure jet grouting water guiding to form a saturation disturbance body at the position of a hard soil layer firstly, then, side pile grouting fluid starts to be injected when a jacked pile sinks to the saturation disturbance body, pile end grouting fluid then continues to be injected in the pile end after the pile tip reaches the designed depth so that a grouting expansion head can be formed by the pile end, and the problems thatjacked pile sinking is difficult and bearing capacity instability is likely to be caused by water guiding are solved.

Description

technical field [0001] The invention relates to the technical field of foundation construction, in particular to a pile sinking construction method for a static pressure pile assisted by grouting after a high-pressure swirling jet pilot hole. Background technique [0002] Static pressure pile is a pile sinking process that presses the pile into the soil through the self-weight of the static pressure mechanism of the pile driver and the counterweight on the frame to provide the reaction force. This pile pressure method completely avoids the vibration, Noise and pollution, with the advantages of no noise, no vibration, no impact, no pollution, etc., has been widely used in industrial and civil building foundations. [0003] However, the static pressure method will produce a more obvious soil squeezing effect during the pile pressing process, especially for hard soil layers that are difficult to penetrate (such as silt layers, sand layers, and silt layers), supplemented by flus...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method of first high-pressure swirl-jet pilot holes and then grouting to assist static pressure pile sinking, which has the advantages of solving the problems of static pressure pile sinking and unstable bearing capacity caused by drinking water

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