Anchor rod construction method for preventing water running and sand jetting during drilling hole

Abstract

The invention relates to an anchor rod construction method for preventing water from running and sand from jetting during drilling a hole. In the method, a drill head, a drill stem, an anchorage device, an anchor bar and the like are sealed in drill holes through the shield of an anti-jet choke plug, namely the drill head, the drill stem, the anchorage device, the anchor bar and the like are controlled in a waterproof curtain. The outer edge of a waterproof choke plug is tightly connected with the wall of the drill hole on the waterproof curtain through a fast-setting material and the drill stem enters the back of the waterproof curtain from the waterproof choke plug, so that the channel in the hole where water and soil lose are blocked. A pressure-releasing pipe for controlling the discharge rate is arranged in the anti-jet choke plug, so that the influences of higher pressure generated in the high-pressure rotatable jetting or grouting process on peripheral environments, the waterproof curtain and an enclosure structure can be controlled, and part of water and soil which are replaced can be discharged from the internal part timely. Due to the construction application in high-water-pressure powdery and sandy soil layers such as powdered soil, powdered sand and the like, good engineering effect is achieved and good social and economic benefits are generated.

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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