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Concrete Construction: reinforcing, forms, saw, shore, precast, erect

concrete form, reinforce, shore, erect, prestress, precast, demolition
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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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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.

constructionconcreteresteelrebarreinforcingsteelstirrupbeamgradesupportcast in placegrade beamDenverColoradoDecember20062718resteel support 2718

  • Crane lifts precast concrete panel cladding panel from vertical racks on truck trailer to place it in position on west side of midrise residential building. Ashley Terrace, Ann Arbor, Michigan April, 2007.
  • Manitowoc crane with luffing boom lifts precast concrete panel cladding panel into position on west side of midrise residential building. Ashley Terrace, Ann Arbor, Michigan April, 2007.
  • Manitowoc crane lifts precast concrete panel cladding panel into position on west side of midrise residential building. Worker on left pulls panel toward building with tag line and his hand and worker on right reaches out with 2x4 lumber to pull right side tag line so he can reach it. Ashley Terrace, Ann Arbor, Michigan April, 2007.
  • Manitowoc crawler mounted lattice boom crane with luffing jib lifts hollow core precast concrete floor deck slab off flatbed trailer powered by Peterbilt semi tractor. Ashley Terrace, Ann Arbor, Michigan April, 2007.
  • Structural ironworker supported by Genie scissor lift electric arc welds steel seat angle to flanges of wide flange H column structural steel to support corner of hollow core precast concrete deck member. Manitowoc crane supports the precast member, waiting for seat angle to be attached. Two ironworkers wait to guide precast member into place, after seat angle is ready, using rope tag line hanging from corner of member. Ashley Terrace, Ann Arbor, Michigan April, 2007.
  • Structural ironworker uses tag line to manuever hollow core precast concrete slab section through steel structure members to place it in its proper position. It is a tight fit, which will require the ironworker on the left to move the section a little to the left using a pry bar. Precast member is supported by Manitowoc crane. Ashley Terrace, Ann Arbor, Michigan April, 2007.
  • Structural ironworker uses tag line to manuever hollow core precast concrete slab section through steel structure members, a tight fit, which the ironworker on the right assists by prying the section to the left with a prybar. Precast member is supported by Manitowoc crane. Ashley Terrace, Ann Arbor, Michigan April, 2007.
  • Structural ironworkers guide precast hollow core concrete slab member onto its supports, beam on left and beam and seat angle on right. Precast member is supported by Manitowoc crane. Ashley Terrace, Ann Arbor, Michigan April, 2007.
  • White-GMC truck tractor pulls trailer of large form panels into which concrete will be placed for basement walls of single family residences. Pittsfield Village, Michigan, March, 2007.
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  • Two precast concrete structural sections transported on flatbed semitrailer pulled by Kenworth tractor. Plymouth Road, Ann Arbor, Michigan. March 2007.
  • Worker carries dimension lumber on shoulder to provide support for cast in place concrete forms and/or fall protection, as we see around him. Worker in rear is performing rough carpentry on such lumber. Mosher Jordan Renovation and New Dining Center, University of Michigan, Ann Arbor, March 2007.
  • 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.
  • 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.
  • 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.
  • 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. 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. Phoenix, Arizona, November 2006.
  • 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.
  • 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.
  • 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.
  • In background from far right to left are (1) concrete basement walls with forms removed, (2) vertical reinforcing steel for concrete basement walls still to be cast. (3) Gang forms in place for casting basement wall, (4) vertical reinforcing steel for concrete basement walls still to be cast. Sitting away from basement walls are 3 gang forms used for basement walls. Ashley Terrace, Huron St, Ann Arbor, Michigan 2006
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