| 摘要 |
PROBLEM TO BE SOLVED: To provide a positioning device for adjusting the pitch of threaded reinforcements with high accuracy in manufacturing precast beams. SOLUTION: The positioning device 10 adjusting the end pitch of two threaded reinforcements 20 arranged in a straight line comprises a cylindrical body 11, positioning screws 12 and guide screws 13. Positioning threaded holes 11a and guide threaded holes 11b are formed in the peripheral wall of the right and left parts of the cylindrical body 11 so as to be located on spirals with the same helix angle as the thread ridges 21 of the threaded reinforcements 20. The guide screw 13 screwed into the guide threaded hole 11b gets into a clearance between the thread ridges 21 with play, and the cylindrical body 11 is screwed to both threaded reinforcements 20 like a coupler nut. In a screwed state with rough pitch adjustment made, the positioning screws 12 screwed into the positioning threaded holes are screwed. The tip parts are thereby fitted between the thread ridges 21 of the threaded reinforcements 20 without play to adjust the pitch of the two threaded reinforcements 20 with high accuracy. COPYRIGHT: (C)2007,JPO&INPIT
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