HELICAL PULLDOWN ® Micropiles Report A CASE HISTORY Project: Billboard in Substation Toronto, ON The Problem: The City of Toronto requested that Ontario Hydro improve the streetscape of its transformer station downtown at John and Wellington streets. To do so, a 34-ft.-high billboard was to be erected, 210 ft. long on one street and 170 ft. on the other. The billboard frame was to be structural-steel trusswork supported by eight structural-steel

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