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Montreal Mega Hospital
The Montreal University Health Centre is a merger of three existing university hospitals, Hôtel-Dieu de Montréal, Hôpital Notre-Dame and Hôpital Saint-Luc, into one of two major healthcare networks in Montreal. The new building will feature cutting-edge technology and will comprise nearly all of the network’s clinical services; its in-patient services, its diagnostic treatment services, plus all hospital beds and most of its outpatient clinics. Virtually everyone will be able to relocate from the three existing hospitals by 2016.
In order the complete the colossal project, two leading contracting firms, Laing O’Rourke and Obrascon Huarte Lain, joined together to form Construction Santé Montréal (CSM). They hired Coffrage Alliance as the formwork contractor for the job, who turned to Laval-based TPG Concrete Pumping (TPG) to determine a plan for placing the immense amount of concrete required for the hospital.
With a footprint totaling approximately 30,480m2 (100,000 square feet), it was essential to figure out a concrete placing system that could reach all parts of the project with minimal set-up and tear-down. TPG suggested a set-up consisting of two Putzmeister trailer-mounted pumps to pump through RS 750 pin towers up to four Putzmeister MX 36-4 Placing Booms. With a horizontal reach of more than 35m (115 feet) each, the placing booms were able to cover nearly the entire project footprint.
“Due to the sheer size of the job, we needed to provide the most efficient concrete pumping solution,” said David Mirabella of TPG. “The combination of the four placing booms worked really well for this application.”
Reaching 21 Stories
To pump to the maximum height of more than 91m (300 feet), the team selected two Putzmeister BSA 2107 HP E Trailer-Mounted Concrete Pumps to connect to the placing booms, which offer a maximum pressure of 220 bar (3190 psi). Currently, the project is nearing completion and the equipment is performing flawlessly pumping vertically.
“The Putzmeister equipment supplied by TPG proved to be critical and effective pieces of equipment in the concreting work at the hospital,” said Carl DiChiara, senior project manager for Coffrage Alliance. “Strength, versatility, and durability are synonymous with Putzmeister and TPG. The project featured unusual and difficult-to-pump mixes for which the equipment proved very reliable.”
Also helping to progress the project vertically was the Z design of the Putzmeister placing booms. With four tower cranes present at different levels on the project, the flexible boom design allowed the crew to work at a level that wouldn’t interfere with the functioning of the tower cranes.
“We really appreciated the Z on the MX placing booms, which allowed us to fully deploy the boom atop our self-climbing shaft system,” said Benoit Hétu, formwork superintendent for Coffrage Alliance. “The task would have been difficult with a different boom style, due to the four tower cranes in constant operation on site.”
Harsh Mix, Long Pours
The harsh concrete mix used, along with some of the pours taking place over a long period of time—up to 16 hours—also posed challenges on the job site. The project called for the use of an anti-corrosive, C80 (80 mpa) cement, which is 10 times stronger than the typical hospital seismic resistant strength required. While the harsh mix is harder on the pumps, the Putzmeister equipment was up to the challenge.
“Regardless of the harsh mix design and the long pumping durations, the Putzmeister equipment was always ready to perform due to its free flow hydraulic system, which kept the systems running cool,” explained Mirabella.
Concrete work at Montreal University Health Centre is wrapped up at the end of 2014 with the hospital opening to patients in 2016.
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