A high-pressure jetting anchor cable drill body and its construction technology

Abstract

The application relates to a high-pressure rotary jetting anchor cable drill body and a construction process of the rotary jetting anchor cable, belonging to the field of construction, comprising a rotary jetting drill pipe and a drill bit, and the drill bit is located at the bottom end of the rotary jetting drill rod and the rotary jetting drill rod Removable connection, the inner wall of the rotary jet drill rod is provided with a snap-inserting slot, the end of the snap-insert slot is open, and the snap-insert slot extends in a spiral shape. The inner wall of the rotary jet drill pipe is fixedly connected with a fixed plate, and a grouting channel is left between the fixed plate and the inner wall of the drill pipe. There is a connecting component between them, and the rotary jet drill rod is provided with a rotary jet, which is located on the side of the fixed plate away from the drill bit; the drill rod of the drill bit is rotatably connected with a bearing plate, and the steel strand is fixed on the bearing plate, and the drill bit One end away from the rotary jet drill pipe is provided with a normal pressure slurry outlet. The present application has the effect of reducing the disturbance to the free section.

Description

technical field [0001] The present application relates to the field of building construction, and in particular, to a high-pressure jetting anchor cable drill body and a construction process for the jetting anchor cable. Background technique [0002] With the continuous development and utilization of urban underground space, deep foundation pit engineering has become more and more common, especially the emergence of super-large and ultra-deep foundation pit engineering, which is more and more important for foundation pit support. Prestressed anchors (cables) Because of its high flexibility, the support system is not limited by the shape and depth of the foundation pit, and will be widely used in the building foundation pit envelope. [0003] At present, the existing Chinese patent with the publication number CN106498943B, which discloses a one-time high-pressure rotary spray type expansion head prestressed bolt device, the prestressed bolt device includes: a drill pipe, a co...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned related technologies, the inventor believes that there is drilling while spraying, that is, the disturbance starts during the drilling process, which has a large disturbance leaf on the free section and the non-effective anchoring section, causing unnecessary damage to the formation. influence, it is easy to increase the initial settlement of the strata outside the foundation pit

Images