... and price 1) Structural compositionPrestressed concrete anchor system is composed of extrusion cans, extrusion springs, shims, restraint rings, spiral bars ... a JY45-150 extruder is used to make an anchor head of extrusion cans, extrusion springs together with steel strands which provides ... be directly passed to the beam end.3)Structural diagram of JYM15 1. Extrusion can (including extrusion spring) 2. ...