Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1988-08-30
1989-09-05
Moon, Charlie T.
Metal working
Method of mechanical manufacture
Assembling or joining
52223L, 254 29A, 405256, B21D 3900
Patent
active
048625760
ABSTRACT:
A method for restressing and locking HHL anchor, comprising a bearing plate placed between a gripping wedge and ground, a bearing shell is mounted over and connects with a jack, a load cell and a nut in series, a jack rod is inserted within the jack and has its lower end threaded inside for engaging with the gripping wedge and then determines the tension of the strands, characterized by providing a tension rod with a lower threaded end outside engaging with the bore of gripping wedge and a upper polygonal convexity fitted with a polygonal concavity of an extension rod having a upper polygonal end and inserted within the upper portion of the jack, operating the jack and jack rod for forcing the gripping wedge upwards for restressing said tension strands, and then, while maintaining the wedge in the restressed position, using a wrench for turning the extension rod as well as the tension rod downwards until the end of the tension rod touches the surface of the bearing plate for obtaining 100% restressing of the strands and locking anchors.
REFERENCES:
patent: 2827770 (1958-03-01), Bakker
patent: 2988794 (1961-06-01), Gutt
patent: 3117485 (1964-01-01), Jansen
patent: 3263384 (1966-08-01), Middendorf
patent: 3778869 (1973-12-01), Andrews
patent: 3787957 (1974-01-01), Andrews
patent: 3844023 (1974-10-01), Surribas et al.
patent: 4106752 (1978-08-01), Roqueta
patent: 4408706 (1977-09-01), Ludvigson
patent: 4604003 (1986-08-01), Francoeur et al.
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