Turbine blade assembly and steam turbine

A turbine blade assembly, comprising:

• a plurality of turbine blades each provided with a blade root portion, an effective blade part and a shroud sequentially in a blade height direction;
• and
• a turbine rotor having at least one blade wheel which is comprised of a plurality of blade grooves formed circumferentially around it,
• wherein a blade cascade is circumferentially formed on the blade wheel by implanting the blade root portions of the turbine blades into the plurality of blade grooves formed in the blade wheel of the turbine rotor,
• the blade root portions of the turbine blades, comprising:
• an embedding portion to be inserted into the blade grooves;
• a shank portion which is formed between the embedding portion and the effective blade part;
• and
• a center cutout portion which is formed in one circumferential side surface of the shank portion;
• wherein a stopper member, which prevents the turbine blade from moving in the axial direction of the turbine rotor, is inserted into each of the center cutout portions;
• and
• wherein the shank portion of the turbine blade to be implanted last into the blade groove of the blade wheel, comprising:
• an axial cutout portion which is formed from one end in the axial direction of the turbine rotor to the center cutout portion;
• and
• a through passage which is formed from the center cutout portion to the effective blade part, moves the stopper member toward the effective blade part within the center cutout portion and inserts therein a moving member which puts a side surface of the stopper member on the axial direction side of the turbine rotor and the inner wall surface of the center cutout portion into a contactable state.