Concrete slab joint stabilizing system and apparatus

E - Fixed Constructions – 01 – C

Patent

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Details

E01C 11/02 (2006.01) E01C 11/06 (2006.01) E01C 11/16 (2006.01) E01D 19/06 (2006.01)

Patent

CA 2630204

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 bilaterally 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. As the housing halves are pushed apart, the outside surfaces of the expandable housing engage the walls of the drilled hole and apply opposing horizontal compressive forces to the slab sections. Friction between the expandable housing and the concrete slab sections prevent the slab sections from vertically moving relative to each other. In other embodiments of the invention, the joint stabilizing apparatus is used to prevent relative motion between non-horizontal construction members, and between four adjacent slab sections separated by intersecting loose joints.

La présente invention concerne un appareil permettant de stabiliser un joint qui comprend un logement cylindrique extensible inséré dans un orifice circulaire creusé au niveau d~un 'joint lâche' d~une dalle de béton qui doit être stabilisée afin d~empêcher un déplacement vertical relatif entre les parties de dalle adjacentes. L~orifice est creusé de manière descendante dans le béton et centré sur le plan d~une ouverture latérale/d~un joint dans la dalle de béton. Le logement extensible se compose de deux moitiés de logement semi-circulaires rigides et l~ensemble est orienté dans l~orifice circulaire de manière à ce que les deux moitiés de logement se trouvent sur les côtés opposés de l~axe de l~ouverture latérale/du joint. Les moitiés de logement sont séparées par l~introduction d~un boulon fileté dans le logement. L~introduction du boulon pousse deux blocs de calage bilatéralement symétriques l~un vers l~autre et comprime les surfaces d~appui des blocs de calage contre les surfaces inclinées se trouvant à l~intérieur de chaque moitié de logement. Lorsque les moitiés de logement sont séparées, les surfaces externes du logement extensible viennent au contact des parois de l~orifice creusé et exercent des forces de compression horizontales opposées sur les parties de la dalle. La friction exercée entre le logement extensible et les parties de la dalle de béton empêche les parties de la dalle de béton de se déplacer verticalement les unes par rapport aux autres. Selon d~autres modes de réalisation, l~appareil permettant de stabiliser un joint sert à empêcher tout déplacement relatif entre des éléments de construction non horizontaux et entre quatre parties de dalle adjacentes séparées par intersection de joints lâches.

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