, a long-time manufacturer of shotcrete and gunite mixers and pumps, has introduced the RS180 Mixer-Pump with variable speeds from 0-18 cubic yards per hour and long-distance and high-volume pumping capabilities. The RS180 is a user-friendly, economical option for gypsum flooring underlayment, grouting, cellular concrete and some wet shotcrete applications. It offers contractors smoother material delivery for specialty applications, ease-of-use for operation and maintenance, and durability for optimum efficiency in a variety of applications.
Formwork expertise and largest Telebelt in the world required for complex project
The Keeyask Generating Station, which is under construction in northern Manitoba, will provide 695 megawatts of capacity and produce an average of 4,400 gigawatt hours of electricity each year for use in Manitoba and for export. The project is located 725 kilometres north of Winnipeg on the Nelson River. Getting material and support to the site is difficult over the rough terrain, and due to the size of the project, the amount of equipment required at any one time is also a challenge.
The project is a collaborative effort between Manitoba Hydro and four Manitoba First Nations. BBE Hydro Constructors LP (BBE), a consortium of Bechtel, Barnard Construction and EllisDon, was contracted to place the 430,000 cubic yards of concrete required for the multiple structures.
The massive project includes a powerhouse/service bay complex on the north side of the river and the seven-bay spillway on the south side, with 1.5 km between the two sets of structures. There will be more than 23 km of dykes on the north and south sides of the reservoir.
Doka was chosen as the formwork supplier due to their strong role in working with project time constraints. Specialists from Doka's North America major projects team and their Western Canada sales team worked tirelessly for months using 3D-printed models and state-of-the-art 3-D CAD programs to put together a quotation package that went above and beyond the competition, the company says.
All forms were designed for full liquid-head concrete-pour pressure. Special quality requirements include fair-faced concrete (which requires no further finishing), and SCC (self-consolidating concrete) mix design. To work under these conditions, the contractor hired two Doka field service technicians and a Doka site engineer to stay at the camp on a 21-day-in/7-day-out rotation.
The complex draft-tube formwork includes the Doka Top 50 large-area formwork system, Staxo 100 load-bearing towers and D22 dam formwork.
The D22 system is used on single-sided, mass pour applications. It has a "rollback" feature that allows formwork panels to be moved away from the concrete by 750 mm to gain access to the concrete face to clean the panels and do necessary concrete patch work, before re-setting to the next pour/lift/location.
Since each formwork structure is split into multiple lifts, the D22 rollback feature was an advantage as it allows for quicker resetting of forms to the next lift. This means quick cycling of the formwork on multi-pour applications: set formwork, install rebar, pour concrete, move forms to the next location, close, set rebar and pour concrete again. Time for formwork resetting directly contributes to the overall construction time.
With its ease of use, the formwork is easily transferred from one area to another when finished on a particular section, meaning less equipment is on site. It also provides for worker safety with large work platforms integrated into the design. The system is efficient as it allows for cycling and reuse of equipment.
Telebelts provide numerous advantages for a mega-project
BBE worked closely with Putzmeister to determine the equipment needed to best place material for the project. They chose the Putzmeister Telebelt TB 200 and TB 130 Telescopic Belt Conveyors.
"Given the massive amount of large aggregate required for such a big project, we decided a TB 200 and TB 130 would be the best solution for Keeyask," says Robert Weiglein, special application business manager for Putzmeister America. "The durability and simplicity of the Telebelts means the units can keep working in all conditions with all types of concrete without experiencing plugging or expensive wear on pipeline equipment."
The 237,220-pound (107,600-kg) TB 200 was delivered to the remote site via four truckloads and assembled by three Putzmeister employees, in addition to a team of four BBE ironworkers and a crane operator. It took two weeks for the crew to assemble and test the machine.
The Telebelts placed material for all areas of the seven-unit powerhouse/service bay complex on the north side, as well as the seven-bay spillway on the south side. The long reaches of both Telebelts - 200 feet (61 m) horizontally for the TB 200 and 126 feet 3 inches (38.5 m) horizontally for the TB 130 - were crucial in constructing the massive structures.
Also a challenge, the jobsite itself is massive, spread out over many miles. It takes about 20 minutes to transport equipment from the powerhouse to the spillway, then another 20 minutes to transport equipment to the batch plant. Having efficient, reliable equipment is crucial to save time and keep operating.
Over the course of the job, the Telebelts are placing aggregate ranging from 40 to 80 mm (1.6 to 3.1 inches). The large aggregate and dry mix would be impossible to pump using a concrete pump; the Telebelts are able to handle these mixes without any difficulty.
"When building a massive structure, like a dam, millions of cubic yards of concrete are required," explains Weiglein. "The Telebelts allow each cubic yard to have a lower cement content, lower/no chemical additives, reduced sand content, lower cement content, and lower water-to-cement ratio, which all mean less cost per cubic yard. That's a significant cost savings when you are talking about millions of yards."
Using larger aggregate has additional advantages. It also means less crushing expense, which is considerable per ton. All aggregate is produced right on site - rock is blasted out of the ground and run through on-site crushers - a huge money-saver given the remote location.
The project began in the summer of 2014 and is due for completion in 2020.
More from Concrete Construction
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McNeilus Truck and Manufacturing, Inc., an Oshkosh Corporation company, has taken one of its most reliable and respected machines, the Oshkosh S-Series front discharge concrete mixer, and made it even better with an array of new features and technologies that pay off with better visibility, increased hauling capability and tighter turning radius.
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More than 60 paver operators from across the U.S. gathered for specialized training as well as for the unveiling of the newest Terex Bid-Well Remote Control paver (model 3600RC) at Terex Bid-Well's annual service school, which took place last month at its facility in Canton, South Dakota.
7,000 jobs under threat as Toronto moves to restrict critical concrete work for high-rise construction
The City of Toronto is poised to restrict concrete work for the construction of high-rise buildings through amendments to the noise bylaw in a move that will threaten more than 7,000 jobs and cripple the industry's ability to deliver much needed housing supply to Torontonians.
Cemen Tech has introduced AP Office and AP Mobile, a new set of tools in its ACCU-POUR technology suite available for volumetric concrete mixer users. AP Office and AP Mobile are an all-new cloud-based productivity solution that provides users a complete view of their concrete business operations. The ACCU-POUR technology suite is designed to make an impact on operations of all sizes, giving users more control over their business than ever before.
Minnich Manufacturing, a manufacturer of concrete dowel pin drills, concrete vibrators and vibrator monitoring systems, showcased the Stinger electric flex shaft vibrator at The ARA Show in Anaheim, California. The Stinger — is a lightweight, durable and versatile vibration solution. "The Stinger is an ideal unit to meet a variety of concrete vibration needs," said Rob Minnich, president/chief marketing officer (CMO) for Minnich Manufacturing. "We're excited to showcase this solution to the rental industry in our return to The ARA Show."
GOMACO will bring their zero-turn capable pavers for maneuverability to Bauma 2019 in Munich, Germany. Contractors around the world face the same job-site challenges, from short runs, tight radii and corners in parking lots, to a multitude of obstacles to pave around. GOMACO's Xtreme curb and gutter machines handle these challenges and can also slipform a 24 inch (610 mm) radius or less. The exciting and fun new technology will be on display at Bauma 2019, April 8-14, in the Outdoor Area FS, Stand 1210/3.
At Bauma 2019 Metalgalante will show the Carmix 45 FX, a new machine that extends the range of self-loading concrete mixers together with Carmix 25 FX and Carmix ONE. According to the company, this compact, easy-to-drive and low-maintenance off-road machine is the most effective and economical solution for producing top-quality concrete in any condition and at any construction site.
GOMACO's new Xtreme GT-3600 curb and gutter machine is displayed for the first time ever in GOMACO's booth in the Central Hall at World of Concrete. The GT-3600 was the first three-track machine to slipform a 24-inch (610-mm) radius, and now, with the Xtreme package on board, tight radius paving is easier and more efficient than ever before. The Xtreme package adds G+ radius software with slew drives, smart-sensored hydraulics, and intelligence to the GOMACO GT-3600.
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GOMACO's GT-3600 was the first three-track machine to slipform a 24-inch (610-mm) radius and now, the new Xtreme GT-3600 curb and gutter machine with the Xtreme package on board makes tight radius paving easier and more efficient than ever before. The Xtreme package adds G+ radius software with slew drives, smart-sensored hydraulics, and intelligence to the GOMACO GT-3600. The Xtreme GT-3600 will be displayed for the first time ever in GOMACO's booth in the Central Hall at World of Concrete 2019 in Las Vegas.
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Cemen Tech has introduced two new dump trailers – the DT-100 and DT-200 – to complement its line of volumetric concrete production solutions. Ideal for hauling concrete, sand, stone, mulch and other materials, these new heavy-duty one and two yard dump trailers are designed for use in residential building projects, rental yards, landscaping applications and other small- to mid-size jobs.
A new record for the largest continuous concrete pour was set in Washington state for the foundation of the Lincoln Square South tower. However, it was short-lived, as less than a month later, the tower next to it beat the record. Vital to both high-profile concrete pours were Putzmeister placing systems, seven truck-mounted boom pumps and a high-pressure trailer pump — all supplied by Ralph's Concrete Pumping, Inc. of Seattle.
Researchers at the University of Cambridge are using microencapsulation technologies developed by Dolomite Microfluidics to develop self-healing construction materials. As highlighted in recent BBC News broadcasts, the Department of Engineering's Geotechnical and Environmental Research Group is developing microcapsules containing ‘healing' agents – such as minerals, epoxy or polyurethane – which can be added to building materials to allow self-repair of small cracks which develop over time. Dr Livia Ribeiro de Souza, a postdoctoral researcher in the group, explained: "Many composite building materials used in the construction industry – such as concrete – suffer fatigue over time, developing small cracks. We are hoping to overcome this problem by adding microcapsules filled with ‘healing' agents to the concrete before it is used. The idea is that, as cracks begin to form, they rupture the microcapsules, releasing their payload and stabilizing the material."
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McNeilus Truck and Manufacturing, Inc., an Oshkosh Corporation company, has announced the creation of a new program to train service technicians in the maintenance of concrete mixer trucks.
GOMACO's new Xtreme GT-3600 curb and gutter machine will be displayed for the first time ever in GOMACO's booth in the Central Hall at World of Concrete 2019. The GT-3600 was the first three-track machine to slipform a 24-inch (610-mm) radius, and now, with the Xtreme package on board, tight radius paving is easier and more efficient than ever before. The Xtreme package adds G+ radius software with slew drives, smart-sensored hydraulics, and intelligence to the GOMACO GT-3600.
Power Curbers Companies, LLC is pleased to announce that Stephen Bullock has been named Chief Operating Officer. Stephen has been with Power Curbers for twenty-four years, and has been Vice President of Sales and Marketing for the last fifteen years. He is a graduate of Wake Forest University. Stephen and his wife Andrea have two daughters, Katie and Laura.
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McNeilus Truck and Manufacturing, Inc., an Oshkosh Corporation company, is recognizing the manufacture of its 100,000th concrete mixer, making the record-setting machine one of the highlights of its booth at ConcreteWorks 2018, at the Gaylord National Resort & Convention Center, National Harbor, MD.
From cutting concrete to checking heights, contractors have a wide range of products to help them be more efficient and safe on the job site thanks to recent releases by Hilti. The company hosted its annual Innovation Day for media and displayed new and recent introductions, as well as a look into the future at a few innovations still on the drawing board.
The largest concrete pour in both Graham's history and the history of Kingston, Ontario, was a spill-free success that took place at the Canada Royal Milk project site. A whopping 4,289 cubic metres of concrete was poured over 9,400 square metres (100,000 square feet) within 20 hours.
Putzmeister America has put an expanded sales and service structure in place as it continues to provide industry-leading support that the company says meets the increasing requirements from its customers across North America.
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