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Construction Safety: trench, traffic, concrete, masonry, shore, housekeeping, wind

Construction safety for equipment, steel erection, masonry, concrete, roofing, cladding, curtain walls, roadway, traffic, rollover, man lifts, personnel lifts.
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  • Trench construction/safety: Caterpillar 938G articulated wheeled tractor with forklift attachment transports steel trench box/shield from one position to another along a trench. Tucson, Arizona November 2006.
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  • 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
  • Trench construction, safety: Caterpillar 3128 crawler mounted backhoe moves large pipe section/spool into trench to construct underground pipe. Workers standing in 8 ft deep trench have no support against sidewall collapse. Near worker is applying pipe joint lubrication in preparation for inserting next pipe spool/segment. Worker safety and the law require: (1) Trenches 5 feet (1.5 meters) deep or greater must be supported or sloped back unless the excavation is made entirely in stable rock, and this soil is not stable rock. (2) Workers must have easy, close exit from trenches, which pipes crossing this trench prevent. Michigan 2006
  • Trench construction, safety: Caterpillar 3128 crawler mounted backhoe moves large pipe section/spool into trench to construct underground pipe. Workers standing in 8 ft deep trench have no support against sidewall collapse. Worker safety and the law require: (1) Trenches 5 feet (1.5 meters) deep or greater must be supported or sloped back unless the excavation is made entirely in stable rock, and this soil is not stable rock. (2) Workers must have easy, close exit from trenches, which pipes crossing this trench prevent. Michigan 2006
  • Trench construction, safety: Caterpillar 3128 crawler mounted backhoe moves large pipe section/spool into trench to construct underground pipe. Workers standing in 8 ft deep trench have no support against sidewall collapse. Near worker is applying pipe joint lubrication in preparation for inserting pipe spool/segment into previously placed pipe. Worker safety and the law require: (1) Trenches 5 feet (1.5 meters) deep or greater must be supported or sloped back unless the excavation is made entirely in stable rock, and this soil is not stable rock. (2) Workers must have easy, close exit from trenches, which pipes crossing this trench prevent. Michigan 2006
  • Trench construction, safety: Caterpillar 3128 crawler mounted backhoe supports large pipe section/spool in trench in constructing underground pipe. The 8 ft deep trench is so deep that the two workers installing the pipe cannot be seen in this photo. The trench has no support against sidewall collapse. Trenches 5 feet (1.5 meters) deep or greater require a protective system unless the excavation is made entirely in stable rock, and this soil is not stable rock. Worker safety (and the law) also require that workers have easy, close exit from trenches, which pipes crossing the trench prevent. Michigan 2006
  • Trench construction, safety: Caterpillar 3128 crawler mounted backhoe straddles trench for underground pipe. Worker in trench is fine grading/cleaning trench with shovel. Workers standing in 8 ft deep trench have no support against sidewall collapse. Safety and laws require the trench walls to be supported or sloped back at depths greater than 5 ft. Michigan 2006
  • Concrete/masonry construction: Adjust-It wall bracing to support a free-standing masonry wall against wind forces. Bracing shown here uses diagonal rectangular steel tubing in compression on both sides of the wall. World of Concrete/Masonry, Las Vegas, Nevada January 2006
  • Highway construction, traffic maintenance, safety: Kawasaki 70ZV wheeled front end loader transports concrete traffic separation barrier/ aka Jersey barrier using a barrier clamp and is placing it in position as indicated by worker on ground. Las Vegas, Nevada, January 2006.
  • Police cruiser/car: Ann Arbor Police SUV makes quick U-turn, over curb, to follow Ford car at left that was surely exceeding the construction work zone speed limit of 25 miles per hour. SUV was parked facing North on grass to left of this Southbound lane of the parkway. It put on its lights and made a fast U-turn, over curb down to pavement on its left, across 2 lanes, and up on curve and then back down to pavement. All in the time it took the vehicle ahead of it to move from crest of hill to present position. Obviously the police officer cut in front of tan van beyond it but only a car length away, creating a hazard for the van. The SUV follows and stops the car just past Geddes at ramp to Huron River Bridge. Huron Parkway North of Geddes, at Huron High School, Ann Arbor 2005.
  • General Conditions construction, construction security: Traffic police officer in Ford Expedition pulls driver over for exceeding speed limit in construction work zone. Speed limit is 25 miles per hour. Huron Parkway, August 2005
  • Bridge construction, highway construction, flag zone: Flag zone to maintain and control traffic during repair of pavement on one lane of two lane highway/bridge. Traffic in our direction has been stopped so oncoming traffic can use the oncoming lane. After traffic in oncoming direction has traversed traffic zone, additional traffic in that direction will be stopped, and traffic in our lane will traverse zone. This reversing cycle continues until repair is completed and two lane traffic can resume. Bridge on US 197 across Columbia River between Oregon and Washington at the Dalles, 2005.
  • Bridge construction, highway construction, flag zone: Flag zone to maintain and control traffic during repair of pavement on one lane of two lane highway/bridge. Oncoming traffic has been stopped so our traffic can use the oncoming lane. After traffic in our direction has traversed traffic zone, additional traffic in our direction will be stopped, and oncoming traffic in this lane will traverse zone. This reversing cycle continues until repair is completed and two lane traffic can resume. Netting on right protects river and shipping from possible falling debris from work zone. Bridge on US 197 across Columbia River between Oregon and Washington at the Dalles, 2005.
  • Bridge construction, steel construction: Worker gives hand signals to Terex crane operator to lower boom and crawl forward slowly to avoid contact of boom and cables with overhead wires to the left. Dixboro Bridge over Huron River, Ann Arbor, Michigan 2005.
  • Bridge construction, steel construction: Worker stands on cab of Terex crawler mounted cable rigged open web crane and pushes overhead wires up and away from crane cab and boom as crane crawls underneath overhead wires. Dixboro Bridge over Huron River, Ann Arbor, Michigan 2005.
  • Construction safety: Lower right is steel frame shoring for concrete structure to be cast at midheight of photo. This shoring will support several inches of freshly poured concrete, weighing 12.5 lb per sq ft per inch of thickness. The shoring is supported by a paved street that normally carries car and truck traffic and is highly vulnerable to impact from such vehicles. Large, highly visible construction zone signs and striped orange barrels and blinking lights warn possible traffic. An opening through lower part of shoring avoids workers or pedestrians trying to crawl through shoring. Concrete barriers help protect left side of shoring from vehicles, and stored, stacked steel shoring on pavement helps protect right side. A guardrail at perimeter of slab formwork provides fall protection for workers, particularly those who place reinforcing steel and concrete.<br /> <br /> Left half is midpoint of forming and shoring for next floor of the concrete structure, with formwork at top and vertical steel frame reshoring at midheight to distribute weight of new concrete between the two concrete floors now in place. The two new concrete floors have not been in place long enough to have reached full 28 day design strength. Catwalk with guardrail provides walkway and fall protection for workers.<br /> <br /> Right rear of photo is formwork for vertical concrete walls, with temporary catwalk on the outside for access by workers and guardrail that provides fall protection. Stored, stacked steel shoring is lower right. Ann Arbor, 2002.
  • CONEXPO 2005, road construction safety: Traf-Tech CT240 traffic cone automated placement and retrieval truck. It operates on either side, as truck moves along. CONEXPO Silver Lot, Las Vegas, Nevada, March 15-19, 2005.
  • Construction safety: Placing brick pavers as part of new brick pavement. Workers are kneeling on curb, gutter, and pavement of street carrying traffic, yet they have no traffic warning barriers or signs, no highly visible orange or striped clothing, and no traffic control to protect themselves from moving traffic. Ann Arbor, 2004.
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