VERBESSERUNGEN AN MEHRSCHRAUBENSPANNERN.

摘要

PCT No. PCT/GB86/00125 Sec. 371 Date Nov. 6, 1986 Sec. 102(e) Date Nov. 6, 1986 PCT Filed Mar. 6, 1986 PCT Pub. No. WO86/05309 PCT Pub. Date Sep. 12, 1986.A method and apparatus for tensioning groups of studs to a predetermined strain. The method includes the steps of tensioning all of the studs simultaneously to a predetermined tension, tightening working nuts, releasing the tension on the studs, measuring the residual strain on the studs and determining for which studs the strain is outside a predetermined tolerance range, retensioning the studs to a tension greater than the predetermined tension, rotating the nuts for the studs which are outside the predetermined residual strain tolerance range in step by amounts and in directions corresponding to the amount and direction in which the strain deviates from the predetemined value and releasing the tension on the studs.