COMPOSITE ANCHOR Russian patent published in 2007 - IPC E21D21/00 

FIELD: land-based and underground building structures and mining, namely anchoring-bolts for roof, floor, or shaft-lining protection, particularly anchors formed of composites based on fiber material and polymeric binder.

SUBSTANCE: anchor comprises fixing assembly including threaded bush 1, washer 2, rod 3 with shaped projections 4 and sacrificial layer 5. Rod 3 is solid or has central through channel 7. Rod has round or rectangular cross-section with straight, concave or convex sides. Continuous or interrupted shaped extensions are formed on rod surface. The extensions pass along or transversal to longitudinal axis thereof or extend along helical line. Rod 3 is made of composite material based on unidirectional fibers and polymeric binder. Sacrificial layer 5 is formed of crossing or interwoven fibrous threads, bundles or bands and connected to the rod by means of binder used for rod production. Volumetric ratio between unidirectional rod fiber and thread, bundle or band fiber of sacrificial rod layer 5 is from 1:0.04 to 1:0.5. Total binder content in rod is 15-50% of total fiber content therein.

EFFECT: increased load-bearing ability of anchor due to increased rod surface provided with sacrificial layer.

14 cl, 15 dwg