This article describes new developments in lasers and other reference beams used in tunneling for the alignment of excavations, installation of conveyors and placement of offsets. They are often coupled with electronic gyro- and automatic motorized laser theodolites, also known as total stations. The greatest step forward has been the reduced need for surveying teams and the wait needed while they do their work. However, the automated surveying systems require closer supervision and greater skills from the non-surveyor personnel using them. The most basic system used a laser directed at a passive combined target and inclinometer unit with an optoelectronic, micro-processor- controlled sensor. Facilities can correct for laser beam deterioration due to environmental factors and refraction. Modern automatic total stations allow the tracking of a reflector target in automatic recognition mode. The basic guidance system can calculate curves for deviations and display an almost bewildering amount of information, necessitating adequate information integration. Another consideration is the increasing amount of equipment competing with space in the TBM. Leading control systems also allow the creation of the optimum sequence and orientation of tapered rings to correct the tunnel build radius or correction curve for correct steering without introducing any weakness. Profiling, drills, and roadheaders are also covered.

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  • Corporate Authors:

    Polygon Media Limited

    Tubs Hill House, London Road
    Sevenoaks, Kent TN13 1BY,   United Kingdom 
  • Authors:
    • Jones, M
  • Publication Date: 2005-5


  • English

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: p. 44-46
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01001745
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Jul 7 2005 12:00AM