Anne Smith

Anne Smith's Posts

Concrete Pumps, Traveling Forms Speed Construction of Twin-Arch Tunnel

The Cassair Connector Project, a 100-million-dollar upgrade from arterial city street to freeway, made use of both precast and site-cast concrete in several different structures. The largest concrete structure in the project is a 2,394-foot-long reinforced concrete twin-arch tunnel. The tunnel has 35 double-barreled segments, each about 68 feet long, 49 feet wide, and 16 feet high. The tunnel's heavily reinforced slabs serve as both structural slabs and finished pavement for the tunnel. Eighteen months were allowed for construction, with only 10 months available for actually pouring the tunnel segments. Read more

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Irish Artist Sculpts with Concrete

Artist Kathy Goodhue, Dublin, Ireland, switched to concrete as a sculpting material after experiencing dissatisfaction with using metal and wood. She found that concrete was less costly and allowed her greater creativity with her color and texture needs. Despite the large scale of most of her concrete sculptures, Goodhue needs only a few simple hand tools to create them. First, she makes a small scale model of the piece in plaster, then she builds a full-scale armature using the model as a guide. Read more

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Thin-Shell Concrete Dome Built Economically with Rotating Forming and Shoring System

The thin-shell concrete dome topping the Sundome in Yakima, Washington, has 24 wedge-shaped segments arranged in a radial pattern like the pieces of a pie. But only six wood forms were needed to cast the 24 segments because of an innovative rotating forming and shoring system. The Sundome roof has a rise of 40 feet and a maximum clear height above the floor of 80 feet. Its 24 identical wedge-shaped segments arch to a compression ring at the crown of the roof and their bases are stabilized by a post-tensioned concrete tension ring supported on 24 reinforced concrete columns. Each segment is doubly curved like a saddle to increase the stability of the dome. Read more

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Forklift-Moved Forms Simplify Parking Garage Construction

A formwork system moved by forklift rather than by crane was used to build the upper ramp of a two-level, 1,250-car cast-in-place concrete parking garage in Milwaukee. Because of the large area covered by the post-tensioned, slab-and-beam ramp, the contractor had to find an efficient way to transport formwork to the jobsite. The forming system he used consisted of beam and deck forms that can be stripped, moved, and reset using only forklifts and dollies. The main element of the system is a 60-foot-long steel beam form that rests on 18-kp support frames having hinged, height-adjustable legs. Because the beam and its framework support the deck panels, shoring is usually unnecessary. Read more

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12-Tank Concrete Water Treatment Plant Answers St. Louis Water Purification Needs

The Bissell Point Waste Water Treatment Plant, St. Loius, completed in the fall of 1990, is helping the city's sewer district meet strict EPA water purification requirements. The new plant has three sludge pump buildings, each surrounded by four cast-in-place concrete clarifier tanks. General contractors McCarthy Bros. Construction Co. had to complete the pump buildings and the twelve 150-foot-diameter tanks in just 19 months. This allowed McCarthy less than a month to pour each tank. McCarthy used special crane-set gang forms made of steel radius beams, aluminum beams, and plywood. Using enough forms for one and one-half tanks allowed reuse of the forms for all 12 tanks without causing delays in form setup and stripping. Read more

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