Method and apparatus for post-tensioning steel strands in slab construction
OwnerBill Hughesinventor
Life of this patent
Estimating the term…
Abstract
A method and apparatus for post-tensioning a reinforcing strand disposed within a concrete slab of the character having a plurality of reinforcing members embedded therein. The apparatus includes a yieldably deformable elastomeric body having a longitudinally extending passageway formed therein for receiving the reinforcing strand. The apparatus also includes a removal mechanism for use in expeditiously removing the elastomeric body from the concrete slab after the slab has been poured.
Claims15
An apparatus for use in tensioning a reinforcing strand disposed within a concrete slab having a plurality of reinforcing members embedded therein, said slab having a thickness and said apparatus comprising:
- (a) an elastomeric body having a top wall, a bottom wall and sidewalls interconnecting said top and bottom walls, said elastomeric body having a longitudinally extending passageway formed therein for receiving the reinforcing strand;
- and
- (b) removal means operably associated with said elastomeric body for removing said elastomeric body from the concrete slab, said removal means comprising a gripping member connected to said elastomeric body.
An apparatus for use in tensioning a reinforcing strand disposed within a concrete slab having a plurality of reinforcing members embedded therein, said slab having a thickness and said apparatus comprising:
- (a) an elastomeric body having a top wall, a bottom wall and inwardly sloping sidewalls interconnecting said top and bottom walls, said elastomeric body having a thickness less than the thickness of the concrete slab and including a longitudinally extending passageway formed therein for receiving a reinforcing strand;
- and
- (b) removal means operably associated with said elastomeric body for removing said elastomeric body from the concrete slab, said removal means comprising a generally vertically extending corrugated sleeve disposed within said elastomeric body and a base member having a threaded bore disposed within said vertically extending corrugated sleeve.
An apparatus for use in tensioning a reinforcing strand disposed within a concrete slab having a plurality of reinforcing members embedded therein, said slab having a thickness and said apparatus comprising a blockout assembly for forming a cavity within said slab, said blockout assembly including:
- (a) an elastomeric body having a top wall, a bottom wall, an end wall and inwardly sloping sidewalls interconnecting said top, bottom and end walls, said elastomeric body having a thickness less than the thickness of the concrete slab and including a longitudinally extending tubular sleeve having a passageway for receiving the reinforcing strand, said tubular sleeve extending from said end wall to a location proximate said top wall;
- and
- (b) removal means operably associated with said elastomeric body for removing said elastomeric body from the concrete slab, said removal means comprising a generally vertically extending corrugated sleeve disposed within said elastomeric body and a base member disposed within said corrugated sleeve, said base member having a threaded bore.
A method of post tensioning a reinforcing strand that is to be disposed within a poured concrete slab having a plurality of reinforcing members embedded therein, the method being accomplished through the use of an elastomeric body having a longitudinally extending passageway formed therein for receiving the reinforcing strand and removal means comprising a gripping member connected to said elastomeric body for removing the elastomeric body from the poured concrete slab, the method comprising the steps of:
- (a) inserting a portion of the reinforcing strand into the longitudinally extending passageway formed in the elastomeric body;
- (b) placing the elastomeric body onto the reinforcing members
- (c) pouring the concrete forming the concrete slab around and about the elastomeric body;
- (d) using the removal means, removing the elastomeric body from the poured concrete slab to form a cavity within which a portion of the reinforcing strand resides;
- and
- (e) gripping the portion of the reinforcing strand and imparting tensioning stresses to the strand.
A method of post tensioning a reinforcing strand that is to be disposed within a poured concrete slab having a plurality of reinforcing members embedded therein, the method being accomplished through the use of an elastomeric body having a longitudinally extending passageway formed therein for receiving the reinforcing strand and removal means operably associated with said elastomeric body for removing the elastomeric body from the poured concrete slab, removal means comprising a vertically extending tube disposed within the elastomeric body, a base member disposed with the vertically extending tube and a gripping member interconnectable with the base member, the method comprising the steps of:
- (a) inserting a portion of the reinforcing strand into the longitudinally extending passageway formed in the elastomeric body;
- (b) placing the elastomeric body onto the reinforcing members;
- (c) pouring the concrete forming the concrete slab around and bout the elastomeric body;
- (d) following the pouring of the concrete slab, connecting the gripping member to the base member;
- (e) exerting an upward force on the gripping member to remove the elastomeric body from the poured concrete slab;
- and
- (f) gripping the portion of the reinforcing strand and imparting tensioning stresses to said strands.
Dependencies are inferred from the claim text.