0

A drones view of Bertha: World’s largest boring machine completes tunnel under Seattle

Via Newatlas

The normally sedate city of Seattle sounded more like the set of a science fiction epic today as the world’s largest boring machine roared and screeched its way into the open air. The tunnel boring machine, better known as “Bertha” cut through a wall of reinforced in the shadow of the city’s iconic Space Needle at about 11:15 am, completing the last few feet of a tunnel more than 9,720 ft (2,963 m) long as part of project to build a new road link between the southern and northern halves of the city. New Atlas was there to witness it.

Four years ago, in April 2013, Bertha began the task of digging under the skyscrapers of Seattle to replace the 64-year old viaduct that had been declared unsafe after a 2001 earthquake. The decision was made to remove the elevated roadway to make way for a waterfront park and replace it with an underground tunnel linking the SR 99 motorway.

To do this, the Washington State Department of Transportation (WSDOT) and main contractor Seattle Tunnel Partners (STP) commissioned the Hitachi Zosen Corporation of Japan to build the world’s largest tunnel boring machine. Measuring 326 ft (99.3 m) long and 57.5 ft (17.5 m) wide, it originally weighed 7,000 tons (6,350 tonnes), though it was considerably modified after a major malfunction was discovered shortly after excavation began.

Learn more!

Bertha breakthrough 1


Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.

Join 7,500+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython in 2018 – Python on Microcontrollers is here!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — Despite multiple bankruptcies, RadioShack continues to find ways to keep the lights on

Wearables — Molding with glue

Electronics — A way around surface mount snags

Biohacking — Biohacking : tACS Transcranial Alternating Current Stimulation Demystified

Python for Microcontrollers — Help bring CircuitPython to other languages!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.