Fabrication of welded rail strings above the tunnel site in which they would be installed for Washington Metro necessitated a delivery arrangement which saw the rail placed in a vertical reverse curve of sufficient radius to avoid exceeding the elastic limit that could have produced permanent kinking. A Soviet-developed portable welder was used in a fixed position with other stations generally found in a butt-welding plant. The string then passed over rollers in a trench and through an entry into the subway where roller supports at varying heights completed the 45-ft drop to the tunnel invert. On the floor, rollers were used to move the strings to their installation sites.

  • Availability:
  • Corporate Authors:

    Simmons-Boardman Publishing Corporation

    508 Birch Street
    Bristol, CT  United States  06010
  • Publication Date: 1978-12

Media Info

  • Features: Photos;
  • Pagination: p. 31-33
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00188077
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 27 1981 12:00AM