Concrete Products is the leading source for Concrete Plants, Concrete Mixers, Precast, and Ready Mix news.
 
 

 

Resource Center

Contractor contours central mixed plant

Bouygues Civil Works Florida has mobilized for its Port of Miami tunnel contract with a portable plant bound less by footprint limitations than head room. After configuring equipment to a site below Interstate 395, Montreal-based BMH Systems shipped a portable plant in three modules, stacked to 26 ft., a few feet below the highway. The plant is geared to producing 55- to 80-yd./hour of grout and roller-compacted mixes, delivering them to a site portal—about 900 ft. away—via small, custom cars.

BMH engineers needed to tailor the plant for a very limited area but provide maximum production flexibility for high flowability or RCC mixes. They equipped the operation with a three-compartment, 50-ton aggregate bin; aggregate, cement, bentonite and water weigh hoppers and conveyors or pipes; skip hoist; twin shaft mixer; RCC mix holding hopper; agitating hopper for grout; one 70-ton and two 50-ton cement silos, plus companion bentonite storage; and, control room. The twin shaft mixer charges a conveyor transferring grout or RCC mixes to their holding hoppers. Plant construction began in mid-2010 following a go-ahead from the Florida Department of Transportation to set up production in the I-395 right-of-way.

Bouygues Civil is pumping grout to reinforce twin, 3,900-ft. long, two-lane tunnels; each are built of precast concrete segments forming a structure of 41-ft. outside diameter. RCC will be used for service pavements. Scheduled for 2014 completion, the $607 million project will connect the Port of Miami to Interstate 395 via Watson Island.