Abstract: A concrete slab joint stabilizer including an expandable housing including a cylinder defining a slit running along its longitudinal length, the expandable housing having a housing axis extending longitudinally there through, and an expander configured to expand the expandable housing in directions perpendicular to the housing axis. The concrete slab joint stabilizer is configured to limit relative vertical displacement between two adjacent concrete slabs.

Abstract: Various embodiments provide a concrete slab joint stabilizer including an expandable housing including a cylinder defining a slit running along its longitudinal length, the expandable housing having a housing axis extending longitudinally there through, and an expander configured to expand the expandable housing in directions perpendicular to the housing axis. The concrete slab joint stabilizer is configured to limit relative vertical displacement between two adjacent concrete slabs.

Abstract: A joint stabilizing apparatus having an expandable cylindrical housing is inserted into a circular hole drilled at a “loose joint” of a concrete slab that is to be stabilized against relative vertical displacement between adjacent slab sections. The hole is drilled downward into the concrete, centered on the plane of a lateral opening/joint in the concrete slab. The expandable housing comprises two rigid semi-circular housing halves, and the assembly is oriented inside of the circular hole such that the two housing halves are on opposite sides of the centerline of the lateral opening/joint. The housing halves are pushed apart by turning of a threaded bolt inside of the housing. Turning of the bolt causes two bi-laterally symmetric wedge blocks to draw towards each other, and pressing the bearing surfaces of the wedge blocks against inclined surfaces inside of the respective housing halves.