REINFORCEMENT ELEMENT WITH HIGH ANCHORING PROPERTIES FOR FIBER REINFORCEMENT Russian patent published in 2009 - IPC E04C5/00 

FIELD: construction.

SUBSTANCE: invention concerns reinforcement elements for fiber reinforcement of concrete. Reinforcement element features straight middle part and anchors conjugated radially to it and distanced from middle part by maximum. Anchors are mainly half-waves closing to imagined straight line running through middle part. Half-wave shaping for each anchor is a smooth curve or broken line of three or more sections conjugated radially to each other. At the side opposite to middle part, anchors continue in short straight sections conjugated radially to half-waves; section tilt angle against imagined straight line running over the middle part or parallel to middle part varies within 0° to ±45°. Unlike other fiber structures, this structure allows for stable high anchoring of reinforcement elements in concrete due to anchored straight line sections, as they should bend to follow anchor 'trace' to be pulled out of concrete, enduring great additional contortion stress of concrete and concrete crushing due to the bending and forward travel of fiber stem. Thus possibility of pulling fiber ends out of concrete matrix bulk is eliminated nearly by 100%. Additionally, such rigid anchoring of fiber ends and straightness of the middle fiber part allows putting reinforcement element to use in deformation resistance immediately at the moment of load application, as active (inter-anchor) part of reinforcement elements is not exposed to a moment of straightening under load. Radial conjugations between curved and straight sections prevent stress concentration at the points of reinforcement element bends along the element length, preventing fiber disruption in those points.

EFFECT: stable high anchoring of reinforcement elements in concrete, prevented fiber end plucking from concrete matrix bulk or disruption between curved and straight sites.

2 cl, 1 dwg