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.
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.
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.