Construction Method of Utilizing Rotary Drilling Rig to Assist the Undrained Sinking of Caissons

Abstract

The invention discloses a construction method for assisting an open caisson to sink without drainage by using a rotating drilling machine, which comprises the following steps of: S1, arranging at least one trolley on a track at the top of each longitudinal open caisson compartment, and hoisting the rotating drilling machine to a transverse moving trolley of the trolley; S2, carrying the rotating drilling machine by the trolley to move to a rack platform on the inner wall of a first compartment, mounting a drill rod to the rotating drilling machine, and drilling by using the rotating drilling machine in the first compartment until a preset drilling depth is reached; S3, moving the rotating drilling machine to the rack platform of the first compartment, releasing the connection with the drill rod and moving to a second compartment, repeating step S2, completing the drilling of the second compartment, repeating and finishing the drilling of each single compartment; S4, disassembling all the equipment after the open caisson sinks to a preset position. According to the construction method, when the soil is broken and the mud is sucked efficiently under a non-sandy soil condition, the compartment can be quickly rotated, so that the purposes of enlarging the application range and improving the working efficiency are achieved.

Description

technical field [0001] The invention relates to the technical field of construction of caissons. More specifically, the present invention relates to a construction method using a rotary drilling rig to assist the undrained sinking of a caisson. Background technique [0002] The undrained caisson construction method, also known as the water excavation method, is one of the commonly used construction methods for caisson sinking construction. The characteristic of this method is that the water level inside and outside the caisson well wall remains basically the same or the water level outside the well is slightly higher than the water level inside the well, and the excavation is carried out below the groundwater level. Undrained subsidence construction generally uses methods such as hydraulic dredger and hydraulic jet air suction to disperse the soil to form mud, and the mud-water mixture is discharged out of the well through a water pump or high-pressure air. However, hydrau...

AI Technical Summary

Problems solved by technology

However, hydraulic jetting is mainly suitable for silty soil and silty sand. When the underground soil is non-sandy soil, especially when the clay layer is deep, it is difficult to form mud only by high-pressure water jetting. At this time, submersible excavation is often used. The dredger replaces the suction dredger, but there are still problems such as high failure rate of submersible dredger, poor mud suction effect, and difficulty in bin transfer

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