It’s the end of an era: Bertha, the much-maligned tunnel-boring machine that drilled the State Route 99 Viaduct replacement tunnel, has officially completely come apart. The machine fully emerged into the pit later that month. …
What happens to Bertha after tunnel?
What happens to Bertha once the job is done? Bertha’s front end will be carved up and trucked away. The rest will be pulled out of the Sodo end of the tunnel. Some pieces like motors, hoses, wire and conveyor belts could be reused.
What happened Big Bertha?
After 4 Years, Seattle’s Giant Tunneling Machine Finally Breaks Through. Bertha has broken through. … After dropping into a pit in July 2013, it started digging the tunnel that will hold the replacement for the Alaskan Way Viaduct, an elevated highway that was partly demolished after being damaged by a 2001 earthquake.
Why did Bertha get stuck?
Repairs cause two-year delay
Bertha remained stranded some 1,028 feet into its underground journey from Seattle’s Sodo to South Lake Union after overheating in December 2013. Crews had to excavate a 120-foot deep vault to rescue and repair the giant drill’s front end, work that started in October 2014.
Is Big Bertha still stuck in Seattle?
After 4 Years, Seattle’s Giant Tunneling Machine Finally Breaks Through. Bertha, the largest boring machine in North America, has reached the light at the end of the tunnel, after getting stuck, and sitting motionless underneath the city for two years. Bertha has broken through.
Did they ever finish the tunnel in Seattle?
Tunnel boring was completed on April 4, 2017, the final disassembled pieces of the boring machine were removed in August 2017, and the finished tunnel opened to traffic on February 4, 2019. The machine’s parts were not reusable and were scrapped.
Does Bertha mean fat?
Name. Bertha’s official name was the L/12 (the barrel was 12 calibre in length), or the M-Device. Many sources say that Bertha is a reference to Bertha Krupp, heiress and owner of the Krupp industrial empire. … ‘Dicke’, meaning fat or big in German, is apparently not a reference to the physical aspect of Ms Krupp.
How far could Big Bertha fire a shell?
The gun could fire projectiles weighing up to 1,785 pounds (810 kg) to a distance of almost six miles (9 km). The most widely used type of shell was equipped with a delayed-action fuse that exploded after having penetrated up to 40 feet (12 metres) of concrete and earth.
How big is a boring machine?
Tunnel diameters can range from one metre (3.3 ft) (done with micro-TBMs) to 17.6 metres (58 ft) to date. Tunnels of less than a metre or so in diameter are typically done using trenchless construction methods or horizontal directional drilling rather than TBMs.
What blocked Big Bertha in Seattle?
The Washington State Department of Transportation said Friday that the steel pipe that stopped Bertha, as the borer is nicknamed, on Dec. 6 is a 119-foot-long well casing installed in 2002 to study groundwater movement under downtown Seattle.
What is the biggest drill in the world?
This is the Kola Superdeep Borehole, the deepest manmade hole on Earth and deepest artificial point on Earth. The 40,230ft-deep (12.2km) construction is so deep that locals swear you can hear the screams of souls tortured in hell.
How fast are tunnel boring machines?
Tunnel boring machines (TBMs) have extreme rates of tunneling of 15 km/year and 15 m/year and sometimes even less. The expectation of fast tunneling places great responsibility on those evaluating geology and hydrogeology along a planned tunnel route.
How deep is the 99 tunnel in Seattle?
At its lowest point, the tunnel crown is at elevation -95 feet, and it is 215 feet deep at its greatest depth below grade. Development along the alignment consists of on-grade and elevated roadways, buildings ranging from single-story to high-rise structures, railroad and sewer tunnels, and public and private utilities …
Are tunnel boring machines reused?
Once the TBM has completed both tunnels, most parts from the trailing gear (gantries) will be sold back to Herrenknecht, the manufacturer, for reusing in other TBMs. The other parts that cannot be resold, such as the shield and cutter-heard, will be recycled.
How much does a tunnel drill cost?
Digging the tunnel alone will cost $2 billion. The $80 million Bertha traveled 5,000 miles from Osaka, Japan where she was built by Hitachi Zosen. The owner of the tunnel-boring machine is Seattle Tunnel Partners, the contractor chose by WSDOT for the tunnel project.
How much did the Seattle tunnel cost?
The viaduct and tunnel cost $18 million to construct (equivalent to $139 million in 2019 dollars) and severed the waterfront from the rest of downtown. The viaduct remained the primary north–south highway in Downtown Seattle until the construction of Interstate 5 (I-5) in the late 1960s.