Title:
STUD BOLT TIGHTENING DEVICE FOR NUCLEAR REACTOR PRESSURE VESSEL
Document Type and Number:
Japanese Patent JPH09216133
Kind Code:
A
Abstract:
To apply prescribed tension to a stud bolt easily by fitting a controller for rotating a prescribed rotational angle nut onto a nut rotating mechanism after heating the stud bolt.
Under no tension generated at a stud bolt 5 with a nut 7 tightened lightly, a stem heater 11 is inserted and heated in a hole in the middle of the stud bolt 5, and the stud bolt 5 is elongated by thermal expansion. A controller 21 controls electric power supplied to the stem heater 11 to control heating of the stud bolt 5, and a nut rotation motor 15 is controlled to turn the nut 7 by a prescribed angle. It is cooled by the stud bolt 5 and is elongated to a degree of the thickness of a flange 3, thus generating prescribed tension.
Inventors:
NOZAWA YUKIHIRO
CHO KOHEI
TAKAHASHI TSUTOMU
CHO KOHEI
TAKAHASHI TSUTOMU
Application Number:
JP2355096A
Publication Date:
August 19, 1997
Filing Date:
February 09, 1996
Export Citation:
Assignee:
ISHIKAWAJIMA HARIMA HEAVY IND
International Classes:
G21C13/02; B23P19/06; B25B21/00; F16B31/04; (IPC1-7): B23P19/06; B25B21/00; F16B31/04; G21C13/02
Attorney, Agent or Firm:
Minoru Hotta (1 person outside)