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My Construction Photos > Steel frame supports horizontal rebars for cast in place concrete beam. Top steel is supported at proper height by a transverse rebar, and height can be adjusted by small chain fall. Top steel supports U stirrups, which can themselves support horizontal bottom steel. Note that steel rebar cage sags under its own weight and requires additional support along its length. Colorado Street, Denver, Colorado, December 4, 2006.
My Construction Photos > At far end, steel frame supports horizontal rebars for cast in place concrete beam. Top steel is supported at proper height by a transverse rebar, and height can be adjusted by small chain fall. Top steel supports U stirrups, which can themselves support horizontal bottom steel. Resteel sags under its own weight and needs additional support along its length. The resteel extends grade beams at near end, which has top steel exposed to bond to concrete slab floor. Colorado Street, Denver, Colorado, December 4, 2006.
My Construction Photos > Precast concrete tilt-up construction: Specialized lifting hardware for tilt-up wall construction by which crane can lift reinforced concrete walls from horizontal casting position to vertical position in wall. Primary hardware is steel lifting stud/anchor/bolt/plug, attached to reinforcing steel or wire embedded in concrete, as shown in circled inset, as it looks after lift is completed and hardware has been released. This is lifted by ground release lifting hardware consisting of a clasp/lock/grip that fits over the lifting stud/anchor and grips it while the attached lifting eye/bale applies lift. The lifting clasp/lock/grip has a release arm by which an attached rope/chain/cable is pulled down by worker on ground to release the lifting hardware from the wall after lift has been completed. A lifting clevis (red here) provides attachment to crane cable by which wall is lifted. Photo shows lifting hardware in place on right, before ground man has activated its release arm by pulling on attached release chain. To left is lifting hardware after its release from lifting stud/anchor. Phoenix, Arizona, November 2006.
My Construction Photos > Precast concrete tilt-up construction: Reinforced concrete wall section was pulled up at its top by crane into near vertical position to form section of outside wall of building. Worker uses impact drill to make hole in slab into which to bolt bracket that supports diagonal shore/brace to hold wall up until roof structure is in place. Phoenix, Arizona, November 2006.
My Construction Photos > Precast concrete tilt-up construction: Reinforced concrete wall section has been pulled up at its top into near vertical position to form section of outside wall of building. Wall section is heavily reinforced concrete that was cast in horizontal position on top of floor slab of building, which alleviated the need for wall forms. It is lifted by steel cable, hooked to wall at a 8 points to provide force sufficient to break wall free from the slab beneath it and lift it into its final vertical position. Two point support from lifting beams/ harness and pulleys provide independent support to each lifting point. Pipe with screw jacks at end align the wall and support it against wind forces. Workers 3, 5, and 6, from left to right, hold chain/cable with which they will jerk out pens locking the lifting cables to the slab wall, and they will next pull to withdraw pens to separate lifting tools from the wall. Phoenix, Arizona, November 2006.
My Construction Photos > Precast concrete tilt-up construction: Reinforced concrete wall section is pulled up at its top into near vertical position to form section of outside wall of building. As foreman on right signals crane operator to hold position of tilted up concrete slab wall section, workers inside and outside manually position bottom of section to sit on its foundation, forming corner with previously placed adjacent section. Worker on left holds up adjustable shore so it does not drag on ground/slab and impact positioning. Phoenix, Arizona, November 2006.
My Construction Photos > Construction safety, fall protection: Worker is contorting himself reaching with his arm and foot around side of ladder, without using his fall protection. Ladder is itself a hazard, because it is supported at top by a rung against the vertical edge of the gang form. It has a loose wire tied around it and concrete bulkhead at top that provides no useful safety. Practice and OSHA law require top of the ladder to be supported equally by its two side rails. Worker carries two safety lanyards and hooks, attached to full body harness and hooked temporarily at his right chest. Michigan 2006.
My Construction Photos > Construction safety, fall protection: Worker has contorted himself around top of ladder, without using his fall protection and is now descending ladder. Ladder is itself a hazard, because it is supported at top by a rung (on which he is placing his bottom foot) against the vertical edge of the gang form. Practice and OSHA law require its top to be supported equally by its two side rails. He has walked along top of concrete basement wall more than 20 feet above the ground, among reinforcing bar tripping hazards, without any fall protection. He carries two safety lanyards and hooks, attached to full body harness and hooked temporarily at his right chest. Michigan 2006.
My Construction Photos > Placing concrete with concrete pump: Concrete shoots out end of elephant trunk in a stream of concrete directed by the worker at the left into wood forms, where it joins with the reinforcing steel to create horizontal foundation beams. To the right a second worker inserts and withdraws a flexible concrete vibrator that helps consolidate the concrete. Behind him a worker carries on his back the motor that drives the vibrator. In background is temporary support wall, consisting of vertical steel soldier piles/beams that support wood breast boards that support the soil of the vertical soil embankment at the edge of the excavation. Soldier beams are supported at mid-height against lateral movement of soil by steel rod tiebacks, shown here with orange steel plates. Colorado Street, Denver, Colorado, December 4, 2006.
Steel frame supports horizontal rebars for cast in place concrete beam. Top steel is supported at proper height by a transverse rebar, and height can be adjusted by small chain fall. Top steel supports U stirrups, which can themselves support horizontal bottom steel. Note that steel rebar cage sags under its own weight and requires additional support along its length. Colorado Street, Denver, Colorado, December 4, 2006.
My Construction Photos > Steel frame supports horizontal rebars for cast in place concrete beam. Top steel is supported at proper height by a transverse rebar, and height can be adjusted by small chain fall. Top steel supports U stirrups, which can themselves support horizontal bottom steel. Note that steel rebar cage sags under its own weight and requires additional support along its length. Colorado Street, Denver, Colorado, December 4, 2006.
Steel frame supports horizontal rebars for cast in place concrete beam. Top steel is supported at proper height by a transverse rebar, and height can be adjusted by small chain fall. Top steel supports U stirrups, which can themselves support horizontal bottom steel. Note that steel rebar cage sags under its own weight and requires additional support along its length. Colorado Street, Denver, Colorado, December 4, 2006.
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