PREGROUTED PC STEEL MATERIAL AND CURING METHOD FOR PREGROUTED LAYER THEREIN

摘要

A pregrouted PC steel material (10) includes a 19-wire-twisted PC strand (1), a pregrouted layer (2) disposed on an outer periphery of the PC strand (1), and a sheath (3) configured to cover an outer periphery of the pregrouted layer (2). A filling resin (4) is filled between steel wires (side wires) (1b, 1c, 1d). Since the filling resin (4) does not exude to the pregrouted layer (2) before tensioning of the PC strand (10), an operation of tensioning the PC strand (1) is not hindered by curing of the pregrouted layer (2). In contrast, since the gap between the steel wires is reduced when the PC strand (1) is tensioned, the filling resin (4) flows out (exudes) from between the steel wires to the pregrouted layer (2) to cure the pregrouted layer (2) only after the reduction.

主权项

1. A pregrouted PC steel material comprising: a PC strand formed by twisting a plurality of steel wires; a pregrouted layer disposed on an outer periphery of the PC strand to contain the PC strand; and a sheath configured to cover an outer periphery of the pregrouted layer,
wherein a filling resin configured to promote curing of the pregrouted layer is filled between the steel wires in the PC strand, and the filling resin does not exude to the pregrouted layer before tensioning of the PC strand, and exudes to the pregrouted layer owing to a tensioning force during the tensioning.