Construction method using blowout plug to shield oblique drilling hole

Abstract

The invention relates to a construction method using a blowout plug to shield oblique drilling hole, namely, shielded by a blowout plug, a bit, a drilling rod, an anchor device, an anchor bar and the like are sealed in the drilling hole, i.e. are controlled in a water stop curtain. The outer edge of the blowout plug is closely combined with the drilling hole wall on the water stop curtain by a fast-setting material; and the drilling rod enters the rear part of the water stop curtain from the blowout plug, thus plugging a channel with loss of water and soil in the hole. In order to control theinfluence of higher pressure generated in the high-pressure jet grouting or grouting process to the ambient environment, the water stop curtain and a building envelope, and also to lead part of displaced water and soil to be discharged from the inside in time, a pressure relief pipe is also arranged in the blowout plug to control output. By construction application powdery and sandy soil layers with high water pressure, such as powdery soil and powdery sand and the like, the construction method obtains good engineering effect and generates good social and economical benefits.

Description

technical field [0001] The invention relates to a construction technology for strengthening and supporting weak rock and soil in geotechnical engineering, especially in silt, sandy silt, silt, fine sand, gravel and other strata under high water level, the oblique drill Holes and prevent water blasting construction technology. Background technique [0002] In silt, sandy silt, silt, fine sand, gravel and other strata under high water level, it is reinforced by rotary spraying or stirring through oblique drilling, or construction of anchor rods, soil nails, or grouting reinforcement, or construction When the inclined anchor pile is drilled through the water-stop curtain, a large amount of flowing water sandblasting occurs under the action of water pressure, causing harm to the surrounding environment of the reinforced or supported slope. As the excavation depth of the foundation pit increases and the groundwater pressure increases, it is urgent to solve the construction probl...

AI Technical Summary

Problems solved by technology

However, this construction method still cannot effectively control soil erosion and ground settlement problems.

When the water pressure is high, the pressure of water, soil, sand and grout to be squeezed out along the gap between the borehole wall and the drill pipe is also very high, and the grout will lose quickly with the water and soil, and the flow rate will be large. Or the effect of rotary spraying can not be guaranteed, which will not only quickly endanger the safety of adjacent buildings, structures and road pipelines, but also cause danger to construction personnel and construction equipment.

It can be said that there is no more effective construction method to control the water and soil loss of oblique boreholes

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