Prestressed expanding shell anchor rod and construction method thereof

Abstract

The invention discloses a prestressed expanding shell anchor rod. The prestressed expanding shell anchor rod comprises an expanding shell and further comprises an expanding shell inner wedge and an anchor rod which are arranged at the two ends of the expanding shell, the expanding shell comprises an expanding shell connecting part and expanding shell pieces, and the expanding shell pieces are circumferentially arranged on the expanding shell connecting part; the expanding shell inner wedge is in sliding contact with the top of the expanding shell; the anchor rod comprises an anchor rod body, ascrew rod is fixedly mounted at one end of the anchor rod body through a connecting sleeve and is in transmission connection with the expanding shell inner wedge through a thread, and the top of theconnecting sleeve is in extrusion contact with the bottom of the expanding shell; and the anchor rod is rotated to drive the expanding shell inner wedge to move into the expanding shell so as to pushthe expanding shell pieces to deform outwards until the expanding shell connecting part breaks, and finally the expanding shell pieces expand to the hole wall to apply prestress to rock mass. Meanwhile, a construction method of the prestressed expanding shell anchor rod is further provided. The prestressed expanding shell anchor rod has the advantages that the cost is low, anchoring performance isgood, and mechanization and automatic operation are convenient to realize.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering anchoring and supporting, in particular to a prestressed shell expansion bolt and a construction method thereof. Background technique [0002] In the construction process of underground engineering, mine roadway, railway tunnel, slope protection and military engineering, in order to prevent deformation, collapse and instability of the stratum, it is necessary to reinforce the stratum. The main measure adopted is to bury mortar anchors in the stratum The anchor rod or the anchor rod with the expansion shell head uses the tensile force of the anchor rod and the concrete grouting body integrated with the anchor rod to form an integral reinforcement structure for the formation to achieve the purpose of controlling deformation. [0003] Compared with ordinary mortar bolts, prestressed bolts have the following advantages: 1. By applying prestress to the rock mass between the inner and o...

AI Technical Summary

Problems solved by technology

This patent has comprehensive functions and can continuously complete drilling, anchoring and grouting in one construction, but there are still problems: complex structure, high production cost, the bolt body and the tail nut are set through, relying on manual operation, It is not easy to realize mechanized operation. After construction, the bolt body and other components are exposed outside the rock body. Due to process requirements, safety and other factors, cutting needs to be performed, thereby increasing construction costs and reducing construction efficiency.

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