An expansion joint cover for insertion in an expansion gap comprising a first frame section for attachment to a substrate at one side of the expansion gap, the first frame section having a flat surface; a second frame section for attachment to a substrate at an opposite side of the expansion gap, the second frame section having a first connector; a centre section configured to span the expansion gap and slide on the flat surface of the first frame section, the centre section having a second connector; and a linkage section configured to engage with the first and second connectors to connect the centre section to the second frame section, wherein the linkage section can pivot within the first and second connectors to allow movement of the centre section with respect to the second frame section.

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.

An expansion joint cover for insertion in an expansion gap comprising a first frame section for attachment to a substrate at one side of the expansion gap, the first frame section having a flat surface; a second frame section for attachment to a substrate at an opposite side of the expansion gap, the second frame section having a first connector; a centre section configured to span the expansion gap and slide on the flat surface of the first frame section, the centre section having a second connector; and a linkage section configured to engage with the first and second connectors to connect the centre section to the second frame section, wherein the linkage section can pivot within the first and second connectors to allow movement of the centre section with respect to the second frame section.