Abstract: The invention relates to a shuttering element for separating a concrete section into concrete subsections. The shuttering element is of strip-like form and is adapted widthwise to the thickness of the concrete section. It comprises at least a strip-like shuttering board which is formed from a thin-walled, sheet-like material, with the result that, once the concrete section has been cast, the shuttering board can remain between the cast concrete subsections. The shuttering board preferably has recesses through which reinforcement struts can engage, with the result that the shuttering element according to the invention can be inserted even when reinforcement struts of a reinforcement are required to cross the shuttering element.

Abstract: Sealing device for sealing a joint (2) formed between two sections (3, 4) to be concreted, whereby the sealing device is embedded in the sections (3, 4) so that it is positioned at a right angle to the abutting ends (5, 6) of the joint (2) opposite the concreted sections (3, 4), whereby the sealing device is formed as a thin-walled, strip-shaped joint rail (1) made of rigid plastic and its dimensional shape and its wall thickness are so dimensioned that it is self-supporting.The rigid plastic is preferably a thermoplastic plastic, in particular HDPE, which is dimensionally stable in a temperature range of -20.degree. C. to +80.degree. C.