Cryogenic tank with anchored membrane

1. A cryogenic tank, comprising:

a membrane anchor mechanism which fixes a membrane provided on an inner wall surface side of a concrete wall via a heat insulating material to the concrete wall;

a pressing part which is provided by the membrane anchor mechanism and presses the membrane from the inside of the cryogenic tank; and

an interposition part which is interposed between the pressing part of the membrane anchor mechanism and the membrane, and includes a first abutment surface coming into surface-contact with the pressing part and a second abutment surface coming into surface-contact with the membrane;

wherein the membrane includes a corner membrane panel which is a curved membrane panel disposed at a corner portion of the tank, with the corner portion of the tank formed by two surfaces, and

the interposition part is interposed between the pressing part and the membrane at the corner membrane panel, and the second abutment surface is curved and is in surface-contact with the corner membrane panel,

wherein an outer edge of the interposition part is welded to the membrane to fix the interposition part to the membrane, and an outer edge of the pressing part is welded to the first abutment surface to fix the outer edge of the pressing part to the first abutment surface.

2. The cryogenic tank according to claim 1 ,

wherein the membrane anchor mechanism includes an anchor which is inserted into a through-hole passing through the heat insulating material and the membrane and in which the pressing part is fixed to a tip exposed through the through-hole, and

wherein a shape of the interposition part is set to an annular shape which is disposed to surround a connection location between the anchor and the pressing part.