Clearance increasing jig of heat transfer tube and additional installation method of vibration suppression member

摘要

A clearance increasing jig (80, 100, 110) of a heat transfer tube (5), includes: a jig main body (81) inserted into a clearance between adjacent heat transfer tubes (5); an inflow hole (88) provided in the jig main body (81) and configured to allow a fluid to flow into the jig main body (81); and an increasing unit (85) provided in the jig main body (81) and configured to increase the clearance as the fluid flows into the jig main body (81).