Patent ID: 7168214

Claim:
In a two-piece joining device-sheet pile retaining walls, which comprises two interlocking, strip-shaped joining elements for connecting two adjacent individual sheet piling elements of the sheet pile retaining walls, having (a) a first joining element being affixable with a first base to an individual first sheet piling element and comprising (1) a neck strip projecting away from the first base and the individual first sheet piling element and (2) an adjoining button strip, and (b) a second joining element being affixable with a second base to an individual second sheet piling element and comprising two hook strips projecting away from the second base and the individual second sheet piling element, which define between them a hollow space and at least partially encompass the button strip of the first joining element so that it is held in the hollow space, the first base base of the first joining element comprises, two longitudinal sides, holding portions projecting away from said two longitudinal sides of the first base, which at least partially embrace outer sides of the hook strips of the second joining element and prevent a widening of the hook strips in the case of tensile forces between the two individual sheet piling elements.