Laboratory of the Research Council of Alberta; Edmonton, Alberta, by 120 ft. wide. Total floor area is Canada, Bell, McCulloch, Spotowski Associates, architects Associated Engineering Services, Ltd., engineers Con-Force Products, Ltd., precast concrete
This government laboratory is de- signed about an interior courtyard. It features a roof system of precast prestressed concrete double-tees and
precast concrete wall panels augment- ed by vertical and horizontal precast concrete sun shades.
The building measures 195 ft. long
33,000 sq. ft. The superstructure consists of a precast double-tee roof system with a clear span of 45 ft. The tees are supported on precast concrete beams and columns. The design pro- vides for a temperature range from 40 degrees below zero to summer tem- peratures in the region of 100 degrees.
The Laurentian Autoroute Bridge, near St.-Adele, Quebec, Canada The Quebec Autoroute Authorities, owner
Regis Trudeau and Associates, engineers
Prestressed concrete box girders were cantilevered out from the piers with travelling forms to create this pair of parallel 530 ft. long bridges over a 100 ft. deep river gorge.
The design is a continuous beam. so two systems of prestressed cables were required one for construction load and one for live loads.
The two box girders that make up the parallel spans. 72 ft. spart. are identical. Bottom flanges are 23 ft. wide and top flanges cantilever 9 ft. out on each side, to give a 41 ft. wide deck for three traffic lanes.
The Los Penasquitos Creek Bridge, San Diego County, California The California Division of
Highways, engineers
Rockwin Prestressed Concrete Corp.,
precast prestressed concrete
Precast prestressed concrete l-gird- ers were used were to span the 140 ft. deep canyon. Simple columns with recessed caps achieved a shallow superstructure.
The jury commented, "A very un- usual, high-level bridge erected with an economy of means and simplicity of design. The natural hillsides it spans are in their original state of beauty."
Far East Architect & Builder February, 1967
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