| 摘要 |
PROBLEM TO BE SOLVED: To give an effectively tightening rotary force corresponding to a nut of each outer diameter by one tensioning force introducing unit even by an axial reinforcing material tensioning nut having different outer diameter and provided in a PC pile form of each of various sizes. SOLUTION: This nut clamping device for a PC pipe tensioning apparatus comprises a rotary cylinder 19 provided in an end opening of a ram chair, a large-diameter nut wrench 25 for rotating a large-diameter nut of a threaded lever at a front surface of the cylinder 19, and an intermediate-diameter nut wrench 27 for rotating an intermediate-diameter nut on a back surface of the wrench 25. A plurality of chucks 2 for a small-diameter nut rotatable along an axial direction of the cylinder 19 are provided in the state that an end roller is projected to an inside from an inner periphery of the wrench 27 on the back surface of the wrench 27, and a spring 36 for pressurizing the wrench 27 in a direction of the wrench 25 is provided between the wrench 27 and a rear end of the cylinder 19.
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