Coolable wall element with impingement plate

A coolable wall element for a gas turbine, comprising:

• a base body having a first surface subjectable to a hot gas, a second surface which is arranged opposite of the first surface and a first seat for housing edges of an impingement plate,
• an impingement plate partly inserted into the first seat, the impingement plate located at a distance and adjacent to the second surface being removable attached onto the base body,
• wherein the base body comprises at each edge of two opposing edges of the second surface a step each comprising a groove as the first seat of the impingement plate, the grooves have opposing first openings facing to each other, said grooves each having a second opening through which opposing edges of the impingement plate are insertable into the corresponding grooves,
• wherein the impingement plate is assembled onto the base body by sliding it along the grooves,
• wherein the impingement plate comprises a bendable retention tab extending from the rest of the impingement plate to a free end of said retention tab, and
• wherein the base body comprises a second seat for the free end of said tab, said second seat is configured to block the moving of the impingement plate relative to the base body when the bendable retention tab is released.

A method for assembling an impingement plate onto the base body of a coolable wall, having a base body having a first surface subjectable to a hot gas, a second surface which is arranged opposite of the first surface and a first seat for housing edges of an impingement plate and wherein the base body comprises at each edge of two opposing edges of the second surface a step each comprising a groove as the first seat of the impingement plate, the grooves have opposing first openings facing to each other, said grooves each having a second opening through which opposing edges of the impingement plate are insertable into the corresponding grooves, wherein the base body comprises a second seat dedicated to receive a free end of a tab of an impingement plate, said second seat is configured to block the moving of said impingement plate relative to the base body when the bendable retention tab is released, and having an impingement plate comprising a bendable retention tab extending from the rest of the impingement plate to a free end of said retention tab, the method comprising:

• inserting the impingement plate into said grooves and sliding along the grooves while temporarily lifting the retention tab in a direction away from the second surface until the impingement plate approaches its final assembly position, and
• releasing or bending the retention tab, such that its free end sits in the second seat where it is blocked prohibiting any further movement of the impingement plate relative to the base body.