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Cast-in-place concrete construction, reinforced: In center of photo, at far end of trench, bent end of rebar is used to pull up bottom rebar in trench during concrete placement to achieve necessary concrete cover under rebar to protect it from soil/moisture/salts and produce bond between concrete and steel. In addition, worker uses shovel to support rebar while concrete is placed. Concrete is being placed through chute from ready-mix concrete truck. Depot Street, Ann Arbor, Michigan, October, 2006.
Cast-in-place concrete construction, reinforced: In lower half of photo, bent end of rebar is used to pull up bottom rebar in trench during concrete placement to achieve necessary concrete cover under rebar to protect it from soil/moisture/salts and produce bond between concrete and steel. Concrete is being placed through chute from ready-mix concrete truck. Depot Street, Ann Arbor, Michigan, October, 2006.
Reinforced concrete construction, construction safety: Bright orange protective/safety rebar caps blunt the ends of rebars to protect workers from most serious injury, should one fall upon extended rebars. The rebars extend from continuous footings to tie into reinforced concrete wall that is supported by the footing. New Ann Arbor high school 2006
Reinforced concrete construction, construction safety: Bright orange protective/safety rebar caps blunt the ends of rebars to protect workers from most serious injury, should one fall upon extended rebars. The rebars extend from continuous footings to tie into reinforced concrete wall that is supported by the footing. New Ann Arbor high school 2006
Earthwork/foundation/basement construction, soil support: Scaffold at center supports reinforcing ironworkers erecting/tying reinforcing steel for shotcrete reinforced concete basement wall to support earth embankment created by basement excavation. The resulting reinforced concrete retaining wall will be the same as the completed reinforced basement wall in the background. The large bore steel diagonal pipe/tubes support the lower part of the wall until the shotcrete has been placed and cured, at which time tie-backs in tension extending into the soil will provide support for the wall, as shown in the wall in the background. The side of the sloped soil embankment on the right is supported by vertical H-section soldier beams that support timber breastboards fitted between the flanges of adjoining H-sections. In addition, the two taller soldier beams are supported by steel pipes/tubes in compression pressing against soldier beams of the far right embankment support. In lower foreground is ramp access to bottom of excavation, by which trucks and equipment enter and leave the hole. Pallazo, Westwood, Los Angeles, California January 2006.
Reinforced concrete structure construction: Basement construction using shotcrete applied reinforced concrete. Shotcrete is being applied to upper half of wall at left center, with one worker spraying shotcrete and the other cleaning off over-shot/excess that accumulates on back form and reinforcing steel. Worker at mid-right is troweling upper half of shotcrete wall, creating a smooth finish. Between the two, at mid photo, is shotcrete equipment, consisting of concrete mixer delivering the shotcrete/concrete mixture and the concrete pump and air compressor spraying the shotcrete/concrete. In background is basement exterior wall. The right side is of shotcrete reinforced concrete. The left side has back form and steel reinforcing steel, waiting for application of shotcrete to complete the wall. Scaffold is in place to support the shotcrete team. Beyond the shotcrete wall on right is temporary soil support structure: steel H-section soldier beams supporting timber breastboards with additional support from steel tiebacks anchored at far end in soil. On left side, soil for upper half of excavated wall has been sloped back to angle of repose of undisturbed soil. The vertical wood forms at various points supported on one side by diagonal braces are backforms for shotcrete. Pallazo, Westwood, Los Angeles, California, January 2006.
Building Construction: Two large segments of a large building site: Retaining wall and foundation construction to left and structural steel construction to right. Mobile crawler crane serves the left, and tower crane serves the right. Cardiovascular Center, University of Michigan Hospital, Ann Arbor, 2004.
Concrete retaining wall construction: Retaining wall in background is in four phases: (1) complete, just right of cneter, (2) formwork erection in center, (3) reinforcing erected just to left of center, and still unreinforced in far left. Three carpenters erect formwork using Genie telescoping mobile lifts. Carpenter form erection tool box is in left center, and carpenter form fabrication is right center foreground. Rebars protrude from footing in foreground, to provide continuity to concrete foundation wall to come. Right foreground shows foundation wall exterior formwork. Other equipment shown is rough terrain forklift to far left, backhoe in background to its right, air compressor in mid-left foreground, wheeled tractor in right background, hydraulic crane boom at top right, and large cable crane at top center. Cardiovascular Center, University of Michigan Hospital, Ann Arbor, 2004.
Concrete construction: Carpenter, supported by Genie telescoping personnel lift, pulls up pieces of cut lumber for bulkhead in formwork for concrete placement for retaining wall. Bulkhead forms a short term construction joint in the concrete, until the next section of concrete is placed to the left. Cardiovascular Center, University of Michigan Hospital, Ann Arbor, 2004.
Cast-in-place concrete construction, reinforced: In center of photo, at far end of trench, bent end of rebar is used to pull up bottom rebar in trench during concrete placement to achieve necessary concrete cover under rebar to protect it from soil/moisture/salts and produce bond between concrete and steel. In addition, worker uses shovel to support rebar while concrete is placed. Concrete is being placed through chute from ready-mix concrete truck. Depot Street, Ann Arbor, Michigan, October, 2006.
Cast-in-place concrete construction, reinforced: In center of photo, at far end of trench, bent end of rebar is used to pull up bottom rebar in trench during concrete placement to achieve necessary concrete cover under rebar to protect it from soil/moisture/salts and produce bond between concrete and steel. In addition, worker uses shovel to support rebar while concrete is placed. Concrete is being placed through chute from ready-mix concrete truck. Depot Street, Ann Arbor, Michigan, October, 2006.
Cast-in-place concrete construction, reinforced: In center of photo, at far end of trench, bent end of rebar is used to pull up bottom rebar in trench during concrete placement to achieve necessary concrete cover under rebar to protect it from soil/moisture/salts and produce bond between concrete and steel. In addition, worker uses shovel to support rebar while concrete is placed. Concrete is being placed through chute from ready-mix concrete truck. Depot Street, Ann Arbor, Michigan, October, 2006.
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