Abstract: A drivable building structure is provided including a first partial construction and a second partial construction movable relative to the first. The first partial construction has a first substructure and a first roadway structure which forms a first drivable surface, and the second partial construction has a second substructure and a second roadway structure which forms a second drivable surface. An expansion joint is between the first substructure and the second. A bridging structure extends between the first roadway structure and the second. The bridging structure spans the expansion joint and has a support plate and an expansion body. The expansion body is supported by the support plate, is cast on site from casting compound, and forms a drivable surface. The expansion body casting compound is polymer-based. The expansion body has a multi-layer structure produced in successive casting operations, and at least two of the layers have different compositions.

Abstract: A pot bearing is provided for absorbing rotations with little constraint, comprising a pot, an elastomer cushion accommodated therein and a cover projecting at least partially into the pot and supported on said cushion. The elastomer cushion is slidingly sealed off from the pot, around the edge beneath the cover by means of a circumferential inner seal, which consists entirely or at least primarily of acetal with a melt flow index (MFI 190/2.16) of less than 6 g/10 min.