High-viscosity thick filling soil layer pore-forming method

Abstract

The invention provides a high-viscosity thick filling soil layer pore-forming method. The high-viscosity thick filling soil layer pore-forming method comprises the steps that S1, a drill bit of a rotary drilling rig is selected according to the diameter of a precipitation tube well, and the diameter of the drill bit is larger than that of the precipitation tube well; S2, parameters of first cementmortar are determined according to the requirements of the high-viscosity thick filling rotary pore-forming operation; S3, the selected drill bit is installed on the rotary drilling rig and drilled to the bottom of a high-viscosity thick filling soil layer by using a pore-forming method of a mud protection wall, and drilling is stopped; S4, parameters of second cement mortar are obtained by reconfiguring the cement mortar parameters, so that the performance of the cement mortar is compatible with a lower portion soil layer of the high-viscosity thick filling soil layer; and S5, a conventionaldig is used for continuing drilling to the specified depth and cleaning the hole in the formed hole of the rotary drilling rig, and the pore-forming of the precipitation tube well is completed. The high-viscosity thick filling soil layer pore-forming method can effectively form holes in high-viscosity thick fill soil layer, and has the advantage of avoiding difficulty of lowering or blockage of precipitation pipe well downhole caused by hole collapsing.

Description

technical field [0001] The invention relates to the field of hole formation in downwater tube wells in construction engineering, in particular to a method for forming holes in high-viscosity thick filling soil strata. Background technique [0002] The downfall tube well is widely used in the excavation process of foundation pit dewatering. It is suitable for silty clay, silty silty clay, clay silt, sandy silt and silt and other soil layers. It has a wide range of applications. Downfall tube wells are generally drilled with ordinary drill bits with a diameter of 250 mm. In high-viscosity thick fill strata, holes may collapse or even voids, and the success rate of hole formation is relatively low. The full-casing drilling process has disadvantages such as difficulty in lowering the casing and high cost. After the hole is completed, the problem that the sunken steel pipe cannot be pulled out often occurs. Contents of the invention [0003] In view of the deficiencies in the ...

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Problems solved by technology

The full-casing drilling process has disadvantages such as difficulty in lowering the casing and high cost. After the hole is completed, the submerged steel pipe often cannot be pulled out.

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