Rear-embedded film bag-type umbrella-shaped expansion tip used for pre-reaming and construction method thereof

Abstract

The invention discloses a rear-embedded film bag-type umbrella-shaped expansion tip used for pre-reaming and a construction method thereof. The rear-embedded film bag-type umbrella-shaped expansion tip used for pre-reaming comprises an umbrella-shaped expansion body device, a plurality of anchor bars penetrating through the umbrella-shaped expansion body device and a grouting pipe II. The umbrella-shaped expansion body device is sleeved with a film bag. A grout outlet of the grouting pipe is located in the film bag. A bar drawing disc, an umbrella-shaped folding rod set and a bar penetration disc are sequentially arranged in the umbrella-shaped expansion body device from front to back. By adoption of the rear-embedded film bag-type umbrella-shaped expansion tip used for pre-reaming and a construction method thereof, the problems that the work of rotary-jetting hole cleaning in a hard clay bed is complex and high in labor and machine consumption, mud in fractures of fracture-developed rock mass flows back into the umbrella-shaped expansion tip and consequentially affects the elements and strength of a grouting consolidated body, and the construction efficiency is reduced due to theadoption of the umbrella-shaped tip technique and the rotary jetting technique for drilling and reaming and synchronous carrying of the umbrella-shaped expansion tip are solved.

Description

technical field [0001] The pre-expanded and post-planted membrane bag-shaped umbrella-shaped expanding head and the construction method thereof of the present invention relate to the field of geotechnical engineering and are specifically applied to temporary foundations in various industries such as housing construction, transportation, railways, water conservancy and hydropower, civil air defense, underground engineering, and national defense. Pit support, permanent slope support, anti-floating anchor rod and anchor cable. Background technique [0002] Before this application, the inventor researched and submitted a patent application for the self-carrying umbrella-shaped expansion structure series of rotary grouting bolts and anchors, which changed the traditional friction anchor into an end-supported anchor, which has solved the problem of the traditional anchor. The stress mechanism of the rod and anchor cable is unreasonable, low bearing capacity, easy to creep, poor du...

AI Technical Summary

Problems solved by technology

[0005] The pre-expanded post-planted membrane bag-shaped umbrella-shaped expanding head and its construction method of the present invention aim to solve the problem that the work of rotary spraying and washing holes in the hard clay layer is relatively complicated, which causes more labor and machine consumption; The backflow of mud into the umbrella-shaped expansion head affects the composition and strength of the grouting consolidation body; and the umbrella-shaped expansion head technology uses the rotary jetting process to drill, ream and carry the umbrella-shaped expansion head simultaneously to reduce the construction efficiency.

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