Anchor cable construction method for multi-stage segmental non-continuous pipe drilling in broken ground

Abstract

The invention relates to a multi-stage segmented non-continuous follow-down drilling anchor cable construction method in a fractured stratum. The construction method is characterized in that followingpipes are only arranged in the fractured stratum; for a non-continuous layered fractured stratum, multi-stage following pipes can be adopted for retaining walls; the rear stage of the following pipecan pass through the inner cavity of the front stage of the following pipe to reach the fractured stratum; after an anchor cable is lowered, when the pipe is pulled out, all the following pipes can bepulled out step by step and end to end at a time through internal and external threads and baffle sheets at both ends of each following pipe; and an anchor rod structure is formed by simultaneous grouting. The construction method includes the steps of carrying out tapping and drilling through a conventional drill bit, processing and assembling drivepipes, changing to another drill bit for follow-down drilling to a stable soil layer, drilling the stable soil layer through the conventional drill bit, drilling to the design hole depth and clearing holes, lowering the prestressed anchor cable andpulling out the pipe and drilling pipes, pulling out a third-stage following pipe and synchronously grouting, pulling out a first-stage following pipe and a second-stage following pipe and synchronously grouting, and tensioning and locking the prestressed anchor cable. According to the construction method, the stability of hole walls can be effectively maintained, and after being used, the multi-stage drivepipes can be pulled out as needed to be recycled and reused.

Description

technical field [0001] The invention relates to anchor cable construction in slope protection engineering, in particular to a multi-stage segmental non-continuous pipe drilling anchor cable construction method in broken strata. Background technique [0002] During the construction process of the prestressed anchor cable, the quality of the hole is directly related to the pullout performance of the anchor cable, especially when the hole is formed under complex geological conditions such as broken and loose strata. There are construction problems such as hole collapse, drill sticking, and buried drilling. However, drilling with pipes is inconvenient for construction. Due to high frictional resistance, it is difficult to pull pipes, which affects the construction efficiency and pull-out bearing capacity of prestressed anchor cables. Contents of the invention [0003] The purpose of the present invention is to solve the problems existing in the existing anchor cable drilling a...

AI Technical Summary

Problems solved by technology

[0002] During the construction process of the prestressed anchor cable, the quality of the hole is directly related to the pullout performance of the anchor cable, especially when the hole is formed under complex geological conditions such as broken and loose strata. There are construction problems such as hole collapse, drill sticking, and buried drilling, while drilling with pipes is inconvenient for construction, and it is difficult to pull pipes due to high frictional resistance, which affects the construction efficiency and pull-out bearing capacity of prestressed anchor cables

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