Method for prestressing casingbolts

Details Method for prestressing casingbolts Method for prestressing casingbolts

1993-03-10

1994-08-23

Rosenbaum, Mark

Metal working

Method of mechanical manufacture

Assembling or joining

254 29A, B21D 3900

Patent

active

053395123

ABSTRACT:
A method for prestressing bolts arranged in places where lateral accessibility is reduced, particularly casing bolts for turbines, comprises the mounting of a bridge element (41) on the end faces of the threaded ends of support bolts (21, 23) positioned at either side of the bolt (22) selected for prestressing, and prestressing of the bolt (22) by means of hydraulic stressing means (42, 45) arranged at the bridge element (41). Also disclosed is an apparatus for carrying out the method according to the invention, the apparatus comprising a bridge element (41), a pulling sleeve (42) with hydraulic drive (45) arranged on the bridge element, and means for generation of hydraulic pressure.

REFERENCES:
patent: 2181744 (1939-11-01), Schmidt
patent: 3749362 (1973-07-01), O'Connor et al.
patent: 4268011 (1981-05-01), Randall
patent: 4604003 (1986-08-01), Francoeur et al.
patent: 4659065 (1987-04-01), Simms

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