A new air traffic control (ATC) tower is expected to begin operations in December at Indira Gandhi International Airport in Delhi, India. The tower is considerably taller than the airport’s existing 60m-high tower, which was built in 1999. Constructed at a cost of Rs3.5bn ($53.8m), the structure will be the seventh tallest ATC tower in the world. The 101.9m tower will be managed by the Airports Authority of India (AAI), which stated that trial runs will commence shortly.
In April, the Indian Ministry of Civil Aviation unveiled plans to increase the airside capacity of Delhi Airport to 95 movements per hour at peak time in the next three years.
Sound Transit’s $3.7 billion project connecting light rail to the Eastside over the I-90 bridge gets started June 1. The project is part of the East Link rail service that will create 14 miles of rail connecting the Eastside to Seattle, part of that stretch will mean trains traveling over the I-90 floating bridge.
The project was approved by voters for the Sound Transit 2 measure, bringing 14 miles of rail to the Eastside, including across I-90, which would make for a 15-minute commute from Bellevue into downtown Seattle.
The floating elements of the I-90 bridge made the engineering and design even more challenging.
“The bridge goes up and down, also when the wind blows the bridge will go slightly north or south, because it’s on anchor cables much like a boat will kind of move around. And, then as traffic loads, the bridge will also move a little left and right,” said Sleavin.
Engineers had to accommodate six degrees of motion.
The transition point between the fixed and floating structure of the bridge was a standout place to maneuver.
At this transition, the rails will rest on bearings and plates allowing movement with the changing lake and bridge conditions. Sound Transit partnered with a company in Tacoma to build two full-size track bridges and test them under simulated operating conditions at a transportation technology center in Pueblo, Colorado.
Sound Transit said it passed all the critical tests.
Trains ran hundreds of times over the test tracks, mimicking the force and movement it’ll experience during normal operations at a speed of 55 mph.
“It’s weight, it’s balance, it’s trim, it’s basically, it’s a 3,500-foot-long boat we’re driving across,” said Sleavin.
Sound Transit says in the rare event of a strong windstorm, with winds between 30 to 40 mph that generate strong waves, it could cause train service to be reduced.
Four car trains are projected to start running in 2023, “And those will be at 8 minute headways in the peak hours, each direction, so about every four minutes there will be a train crossing the I-90 bridge,” said Sleavin.
Earlier this morning at 2:30 am, J Kumar Infraprojects launched the first 24.90 meter long U-girder at Pathanwadi (Malad) for constructing te elevated viaduct of Mumbai Metro’s 16.5 km Line-7 project. This milestone at pier#62 & 63 was witnessed by the Chief Minister of Maharashtra, Devendra Fadnavis, who took a tour of both Line-2 and Line-7’s construction sites and casting yards prior to the event. The U-girder weighs about 150 tons and a few northbound lanes of the Western Express Highway were closed down to facilitate its launch.
J Kumar is responsible for constructing package CA-02, from Aarey Station to Magathane Station, of the line and completed casting their first pier in December 2016 and erecting the 1st pier cap in March 2017. They completed casting the first batch of U-girders for both the 18.6 km Line-2 and Line-7 at the Bandra yard in January 2017, and as per the MMRDA’s website, a total of 109 U-girders had been cast by all 3 contractors of the line by April 26 2017.
Scientists at the Peter the Great Saint-Petersburg Polytechnic University (SPbPU) have created a new construction technique comprised of several types of building blocks based on nanostructured high-strength, lightweight concrete.
The concrete is capable of increasing the load-carrying capability by more than 200 percent and decrease in specific density of the construction by 80 percent. Other advantages to the concrete include resistance to corrosion, aggressive environments and excessive frost resistance.
Researchers calculated that the service life of building structures using this technology could be increased by at least two to three times in comparison to current construction methods.
“Such system allows to ensure the structure integrity even in conditions of seismic activity, since the load is distributed throughout the structure as a whole, and not by individual reinforcement bars,” says Alexander Rassokhin, professor of the Institute of Civil Engineering at SPbPU. “The invention can be used in the construction of bridges and pedestrian crossings, non-metallic ships, low-rise residential buildings.”