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03 Jul


Published by Alyssa de Lima

  1. (Port of Miami Tunnel) cost more than $45 Million USD. The 57.5 ft TBM used in the Seattle SR99 Project cost $80 Million USD (one of the largest TBM's in use).
  2. Mr. Horodniceanu says the MTA recently had to manually dig a particularly difficult 120-foot tunnel at a cost of almost $1 million per foot. By contrast, tunneling 3 miles under Second Avenue with giant machines cost about $19,000 per foot, he says.Apr 24, 2016
  3. Madrid's recently-opened Metrosur line is 41 km long, with 28 stations, yet was completed in four years at around $58m per km. Recent expansions in Paris and Berlin cost about $250 million per km. New York, meanwhile, is building the most expensive subway line of all time, at $1.7b per km.Nov 9, 2011
    • Bertha is a female Germanic name, from Old High German berhta meaning "bright one". The name occurs as a theonym, surviving as Berchta, a figure in Alpine folklore connected to the Wild Hunt, probably an epithet of *Frijjō in origin. Bertha appears as a Frankish given name from as early as the 6th century.
    • A horizontal boring machine or horizontal boring mill is a machine tool which bores holes in a horizontal direction. There are three main types — table, planer and floor. The table type is the most common and, as it is the most versatile, it is also known as the universal type.
    • Bertha is a 57-foot-diameter (17.4 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle.
    • A tunnel boring machine (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 may also be used for microtunneling. ... Tunnel diameters can range from a metre (done with micro-TBMs) to 19.25 metres to date. JOE: molj78joey@yahooligan.com, lestbk82@yahoo.com, shonomat@yahoo.com SHONOBOIWABANIANIKHUTSO
    • First, $1.6 billion comes from multiplying the length of the tunnel (9.6 km) by an assumed average cost of $0.17 billion per kilometre (taken from the Phase 2 HSR study). Second, a further $1 billion comes from building five stations at an assumed average cost of $0.2 billion each (no source provided).Oct 2, 2013
    • Since 1981, however, light-rail costs have exploded: the least expensive light-rail line now under construction, in Salt Lake City, costs more than $50 million per mile, and the average is well over $100 million per mile. There is no way to justify these costs when buses are so much less expensive.Jun 3, 2014
      1. Short subway line, $4.5 billion price tag. NEW YORK (CNNMoney) -- New York City is building a new subway line, one of the largest public works projects in American history. The Second Avenue Subway -- a project more than 40 years in the making -- has a budget of $4.5 billion for the first mile-and-a-half segment.May 31, 2012
      2. The environmental analysis report for the California high-speed rail projects costs of $33 billion for 400 miles, while the Midwest Rail Initiative projects costs of $7.7 billion for 3,150 miles of moderate-speed rail.May 4, 2009
        1. According to a study by the Los Angeles Times, the most current projected fare for the train, $86 a ride, would still be one of the most inexpensive high-speed rail trips on a per-mile basis. When funding for the project was first approved, however, tickets were projected to be closer to the $50 range.May 12, 2015
        2. An artist's rendering of the high-speed rail line. The estimated cost of building a key Central Valley segment of the California bullet train has increased by nearly $1 billion from the original estimate, based on figures in an environmental impact statement approved by the rail agency Wednesday.May 7, 2014


          Global supply chain CO.,LTD.

          15KW TBM tunnel boring machine 250mm - 5000mm for Tunnel construction

          Brand NameGSC
          Model NumberCM-001
          Place of OriginChina
          Minimum Order Quantity1pcs
          Payment TermsT/T or western Union
          Supply Ability10pcs per month
          Delivery Time90 working days after received your payment
          Product NameShield machine
          ApplicationTunnel construction
          Weight10tons to 19 tons
          Curve jackingAvailable
          ColorUp to customer
          Inner diameter250mm-5000mm


          Detailed Product Description

          TBM tunnel boring machine





          Technical Parameter for tunnel boring machine


          Inner diameter


          Outer diameter


          Total length


          Rated power






          Steering cylinders


          Force per cyl/oil pressure


          Stroke per cyl.





          A tunnel boring machine (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.


          The largest diameter TBM, at 19.25 m (63 ft.), was built by Herrenknecht AG for a recent project in Orlovski Tunnel, St.Petersburg. The machine was built to bore through soft ground including sand and clay. Herrenknecht AG built also the world's largest diameter hard rock TBM: "Martina" (excavation diameter of 15.62 mt, total length 130 mt; excavation area of 192 square mt, thrust value 39,485 t, total weight 4,500 tons, total installed capacity 18 MW; yearly energy consumption about 62,000,000 kWh) is owned and operated by the Italian construction company Toto S.p.A. Costruzioni Generali (Toto Group) for the Sparvo gallery of the Italian Motorway Pass A1 ("Variante di Valico A1"), near Florence.


          The former largest diameter hard rock TBM, at 14.4 m, was manufactured by The Robbins Company for Canada's Niagara Tunnel Project. The machine was used to bore a hydroelectric tunnel beneath Niagara Falls. The machine has been named "Big Becky" in reference to the Sir Adam Beck hydroelectric dams to which it is tunnelling to provide an additional hydroelectric tunnel.


          In 2013, Hitachi Zosen Corporation delivered an earth pressure balance TBM to Seattle, United States for the Highway 99 tunnel project

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