Bochum – Deutsches Bergbau-Museum – Tunnelfräser Wohlmeyer-Krupp KTF 280 TBM

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  1. Bochum – Deutsches Bergbau-Museum – Tunnelfräser Wohlmeyer-Krupp KTF 280 TBM expensive
    Photo fromDaniel Mennerich A tunnel boring machine, type Wohlmeyer-Krupp KTF 280 , (TBM) also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They can bore through anything from hard rock to sand. Tunnel diameters can range from a metre (done with micro-TBMs) to 19.25 m 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. Tunnel boring machines are used as an alternative to drilling and blasting (D&B) methods in rock and conventional "hand mining" in soil. TBMs have the advantages of limiting the disturbance to the surrounding ground and producing a smooth tunnel wall. This significantly reduces the cost of lining the tunnel, and makes them suitable to use in heavily urbanized areas. The major disadvantage is the upfront cost. TBMs are expensive to construct, and can be difficult to transport. However, as modern tunnels become longer, the cost of tunnel boring machines versus drill and blast is actually less—this is because tunneling with TBMs is much more efficient and results in a shorter project.




  3. Chantilly VA – Steven F. Udvar-Hazy Center – Republic P-47D Thunderbolt expensive
    Photo fromDaniel Mennerich Republic Aviation’s P-47 Thunderbolt, also known as the "Jug", was the largest, heaviest, and most expensive fighter aircraft in history to be powered by a single reciprocating engine. It was heavily armed with eight .50-caliber machine guns, four per wing. When fully loaded, the P-47 weighed up to eight tons. The P-47, based on the powerful Pratt & Whitney R-2800 Double Wasp engine, was very effective in high-altitude air-to-air combat and proved especially adept at ground attack. The P-47 was one of the main United States Army Air Forces (USAAF) fighters of World War II, and served with other Allied air forces such as France, the UK and the USSR. Mexican and Brazilian squadrons fighting alongside the U.S. were equipped with the P-47. The sturdy and rugged aircraft was designed by expatriate Russians Alexander de Seversky and Alexander Kartveli. The armored cockpit was roomy inside, comfortable for the pilot, and offered good visibility. A modern-day U.S. ground attack aircraft, the Fairchild Republic A-10 Thunderbolt II, takes its name from the P-47.







  6. Too expensive expensive
    Photo fromLeo Hidalgo (@yompyz) Canon 6D + Canon EF 17-40mm F/4 | Would you like to follow me on Instagram, Twitter, 500px, Tumblr or YouTube? anyway, you can also visit my website |




  8. Expensive expensive
    Photo fromZdenko Zivkovic For people that value their time.




  10. Expensive Data… expensive
    Photo fromKrypto I really hope that’s an inaccurate price!




  12. very expensive port wine expensive




  14. Expensive Soul no 5 Para a Meia-Noite expensive
    Photo fromrtppt Expensive Soul




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