First Telebelt® in Saudi Arabia Showcases Benefits of Conveying Concrete
First Telebelt® in Saudi Arabia Showcases Benefits of Conveying ConcreteAbility to convey and place large aggregate makes Putzmeister Telebelt TB 130 welcomed at new port terminal project on Red Sea
STURTEVANT, WI (July 27, 2009) – Located on the eastern shore of the Red Sea, the city of Jeddah is the commercial capital of Saudi Arabia and features the country’s largest port, the Jeddah Islamic Port. This is where the first Telebelt® in Saudi Arabia, a Putzmeister Telebelt TB 130, is making a name for itself, and conveying more than 392 cubic yards (300,000m3) of concrete for the Port’s third container terminal.
The Port serves as a major gateway in the Red Sea region, with more than 70 percent of Saudi Arabia’s imports going through its quays. The third container terminal was needed to better serve the next generation of container vessels, and increase the port’s capacity by 45 percent.
The Saudi Trade and Export Development Company awarded the $230 million terminal project, called the Red Sea Gateway Terminal (RSGT), to China Harbour Engineering Company (CHEC). Al-Tawi Readymix (Al-Tawi), a leading Saudi Arabian concrete manufacturer, was selected to supply and place concrete for the new pier, which would consist of 865 concrete caissons. Work began in January 2008.
With help from the Middle East Development Company (MEDCO), the local Putzmeister dealer, Al-Tawi realized the endless benefits of the TB 130 that made the machine the perfect solution for this project’s demands.
Large-sized Aggregate a Challenge
Although Al-Tawi owns a large fleet of truck-mounted concrete pumps, including 22 Putzmeister boom pumps ranging in size up to the 63Z-Meter with a vertical reach of 203' 9" (62.10m), they chose to use their new TB 130 after performing extensive tests prior to placing concrete.
The tests, which used concrete pumps from various manufacturers to pump the tough mix required for the project, demonstrated extremely high levels of wear on the pumps. This was caused by the absence of smaller grain sizes from some of the aggregates, or what’s called "gap grading" and thus the structural imperviousness of the concrete could not be guaranteed. Pumping large quantities of this composition of concrete would result in high wear costs that simply couldn’t be justified, which is why Al-Tawi turned to its Telebelt.
Telebelt Places The Unpumpable
The versatile TB 130 is an ideal alternative for pumping concrete.
“We are extremely excited to have the first Telebelt in our country,” says Hossam Abdel Aziz, Al-Tawi’s site manager. “We are impressed the TB 130’s capabilities thus far on the project.”
“Our Telebelt easily conveys dry materials - it doesn’t matter if the concrete consistency is only earth-moist, if the water content value is particularly low, or if the concrete grading curve is extremely unbalanced,” comments Hossam Abdel Aziz, Al-Tawi’s site manager. “Our TB 130 easily handles aggregates from sand to 4-inch (100mm) rock.
“In addition, our Telebelt can convey a multitude of different materials including pervious concrete, roller-compacted concrete, gravel, sand, or even wood. This allows us to diversify the types of jobs we can do.”
Concrete for the caissons is being conveyed by the TB 130 into the formworks on shore.
Six different sizes of the caissons are being built; dimensions vary between 31' 2" x 31' 2" x 13' 1" (9.5m x 9.5m x 4m) and 52' 6" x 31' 2" x 5' 11" (16m x 9.5m x1.8m).
On average 235 cubic yards (180m³) of concrete is conveyed by the TB 130 per caisson.
The tough concrete mix is being fed via ready mix trucks into the TB 130’s standard folding hopper.
“The side panels of the hopper fold into the feed conveyor and the end panels connect with linchpins,” notes Aziz. “If need be, we can feed the hopper from three sides.”
With the TB 130’s five-section telescopic boom that features a horizontal reach of 126' 6" (38.56m), reaching the point of concrete placement for the caissons has been deemed fairly seamless.
While conveying the concrete is simple, so too, is keeping the job site clean.
“Telebelts do not require priming and all material can be run off the belts eliminating waste,” notes Aziz. “The unit’s highly efficient spring-tensioned carbide scraper system helps us maintain a clean job site.”
Another advantage of the TB 130 that has proven to be invaluable is its tremendous output. The Telebelt’s 18-inch-wide main (457mm) conveyor belt can convey up to six cubic yards per minute (4.60m³/h). With Al-Tawi’s Telebelt conveying concrete 12 hours a day, this high output capability is greatly appreciated. Incidentally, the main conveyor belt can be placed at an angle of up to 29°, or 68' 3" (20.81m) above grade.
The TB 130 boasts its on-site mobility and ability to fit into confined spaces.
“The TB 130 is being repositioned frequently on site due to site logistics,” says Aziz. “Repositioning is also a simple process. With the fully proportional radio remote controls for the boom and feeder, setup and redeployment is made easy. We simply stow the feeder belt over the cab, place the main belt off the rear and drive the unit to a new position.”
“After the concrete for the caissons has been placed, a large gantry crane will lift the concrete elements onto a pontoon and will be placed into the water at predetermined points,” says Aziz. “Afterwards, the area of water between the artificial quay wall and the shore will be filled in and fortified.”
The RSGT is set to open in late 2009.