In order to protect the public, the workers, and the equipment, a form of protective "shell" has to be created. The form of shell that is commonly used on construction sites is the sidewalk bridge. A checklist for bridges and sheds is shown in Exhibit 6-29. This bridge consists of lolly columns spaced approximately 5 feet on center. Small steel sections are connected at the top to the lolly columns. Then wood planks span the steel beams. Typical pedestrian sections are indicated in Exhibit 6-30 and Exhibit 6-31. The
No smoking sign.
roof of this shell should support a load of 300 pounds per square foot. Safety lights are hung under the planking so pedestrians can see where they are walking. At truck gates (that intersect the pedestrian walkway) strobe lights are placed at the intersections so that pedestrians will know when a truck is pulling in or out of the loading dock. In addition, a flag person is assigned to stop pedestrian traffic. The bridge should extend 50 feet beyond the limits of the site under construction.
At areas where workers will be loading or unloading material at the hoist, a bridge has to be provided to protect the workers. The bridge should support a load of 300 pounds per square foot and should extend at least 30 feet out from the hoist structure. It is best to check with the local jurisdiction to determine their requirements.
In some areas, on the first floor it may be necessary to enclose a linear portion of the space. In this instance, a shed is provided. The shed is used to help keep out the public and minimize the infiltration of adverse weather elements. The shed is usually constructed of plywood.
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