Assembly for a turbomachine turbine and associated turbomachine

An assembly for a turbomachine turbine extending about an axis, the assembly comprising:

• at least one ring sector of a turbine ring, the at least ring sector made of ceramic matrix composite material, and
• a support casing disposed around the at least one ring sector, the support casing comprising two flanges, respectively an upstream flange and a downstream flange, between which each ring sector of the at least one ring sector is disposed, each ring sector of the at least one ring sector comprising a base that has a radially internal face and a radially external face from which radially extend two lugs, the two lugs of each ring sector of the at least one ring sector being retained between the two flanges of the support casing by axial pins, wherein each axial pin is engaged in one of the two flanges of the ring support casing and in the lug of the ring sector of the at least one ring sector facing the one of the two flanges,
• wherein the assembly further comprises, for each ring sector of the at least one ring sector, at least one radial retaining pin extending along a radial direction of the turbine ring, the at least one radial retaining pin being screwed into the support casing and coming to radially bear in said radial direction against a first lug of the two lugs of the at least one ring sector to retain the at least one ring sector in position, and an anti-rotation system adapted to rotationally lock the at least one radial retaining pin,
• wherein each radial retaining pin is screwed into a bush fitted in the support casing, and
• wherein each radial retaining pin is rotationally locked inside the bush by a radially-inserted split pin, which is disposed between the radial retaining pin and the bush.