HEAT RETENTION DEVICE FOR TURBINE CASING, SECURING TOOL FOR SECURING HEAT RETENTION BLOCK FOR TURBINE CASING, AND METHOD FOR SECURING HEAT RETENTION BLOCK FOR TURBINE CASING

摘要

In the present invention, a securing tool (4) for a heat retention block (3) covering a turbine casing main body (2) has: a securing rod (41), one end of which has an engaging part (431) that includes a protrusion (412); and a socket (42). The socket (42) has a guide groove (421), into which the protrusion (412) of the securing rod (41) is inserted, and a recessed groove (422). The guide groove (421) has a first guide groove (421a), which extends in the socket axis direction from a starting end (A1) to a terminal end (B1), and a second guide groove (421b), the starting end A2 of which is connected to the terminal end B1, and which extends from the starting end A2 to a terminal end B2 in a circumferential direction relative to the socket axis. The second guide groove (421b) is connected to the recessed groove (422).