Apparatus for prestressing concrete structures or the like

Winding – tensioning – or guiding – Coil holder or support – Spool or core

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242128, 242155BW, B65H 5938, B65H 8102

Patent

active

048011037

ABSTRACT:
Apparatus for prestressing concrete structures or the like by wrapping tensioned wire around the peripheral walls of the same includes a carriage which travels about the periphery of the structure, a device mounted on said carriage for paying off wire from a wire supply, a wire tensioning mechanism which includes at least one pair of stress wheels which the wire at least partially encircles, a tensiometer, a tensioned wire payout device which is adjustable to pay out wire at selectable heights relative to the carriage, a slip clutch linked to at least one of the stress wheels and being adjusted to slip when torque transferred from the tension in the wire is applied to the clutch and exceeds a predetermined torque value thereby allowing the tension in the wire to be controlled, and a driving motor mounted to the carriage to propel the carriage about the periphery of the structure. A monitoring system is also provided which automatically and rapidly increases or decreases the tension in the prestressed wire being applied to the concrete structure so as to keep the tension in the wire within a small tolerance of the predetermined level.

REFERENCES:
patent: 2520403 (1950-08-01), Hirsh
patent: 2660856 (1953-12-01), Kingsbury
patent: 2711291 (1955-06-01), Kennedy
patent: 2749054 (1956-06-01), Crom
patent: 2785866 (1957-03-01), Vogt
patent: 2797878 (1957-07-01), Crom
patent: 3269672 (1966-08-01), Steinback
patent: 3379385 (1968-04-01), Osweiler
patent: 3687380 (1972-08-01), Magers
patent: 3759489 (1973-09-01), Jones
patent: 3770219 (1973-11-01), Hickman
patent: 3773270 (1973-11-01), Brandestini
patent: 3804268 (1974-04-01), Barron et al.
patent: 4659033 (1987-04-01), Bush et al.

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