| 摘要 |
A permanent anchor is provided to supply tensile force to steel wires continuously by pressurizing a tension head upward using a pressurizer upon a decrease in tensile force of steel wires. A permanent anchor includes a fixture, a pressure plate(G) where steel wires(S) fixed to the fixture and an inner injection hose(12) fixed to the steel wires by an inner space pass through, and an anchorage connected to the pressure plate and composed of a tension head(110), a re-tension head(120) and a pressurizer(130), wherein the tension head is provided with wedge insertion holes(111) to penetrate many steel wires penetrating an installation hole of a pressure plate and to insert many wedges(140) tapered forward, a male screw(112) to engage with a female screw formed on the outer circumferential surface of the re-tension head and many hanging grooves(113) to hang tension jigs to pull for re-tension work, the re-tension head is provided with a female screw(121) engaged with the male screw of the tension head to move on the outer circumferential surface of the tension head, and the pressurizer is placed between the pressure plate and the tension head to make one end supported to the pressure plate and the other end supported to the base of the tension head to offer pressure capacity toward the tension head at the support of the pressure plate. The pressurizer is a thick and strong coil spring to pressurize the tension head upward when tensile force of the steel wires is decreased, so that many steel wires fixed to the tension head by wedges are tensed to get supplied with tensile force continuously. |
