LIQUID PRESSURE DEVICE

摘要

A hydraulic nut (21) used to assemble a turbine case (12) by joining by thread a turbine case (12) to a bolt (15) that is inserted into an insertion hole (13b) of the turbine case (12) with tensile force previously applied to the bolt (15). The hydraulic nut (21) has a cylinder (22) and a piston (23) that are arranged at the turbine case (12). An intermediate piston (27) is axially movably installed in a pressure chamber (26) defined and formed the cylinder (22) and the piston (23), and the pressure chamber (26) is partitioned by the intermediate piston (27) into two chambers that are a first pressure chamber (26a) and a second pressure chamber (26b). In the cylinder (22) is formed a first oil supply opening (31) for supplying hydraulic pressure to the first pressure chamber (26a), and in the piston (23) is formed a second oil supply opening (32) for supplying hydraulic pressure to the second pressure chamber (26b). The piston (23) can be operated when hydraulic pressure is supplied from any of the first oil supply opening (31) and the second oil supply opening (32).