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Hydrotechnical Construction

, Volume 12, Issue 9, pp 869–874 | Cite as

Mechanization of finishing of pneumatic-concrete tunnel linings, ensuring lower roughness

  • N. I. Zinevich
  • A. G. Min’kov
  • A. S. Nikolaev
  • A. A. Pogrebinskii
Paper At the Construction Projects of the Five-Year Plan
  • 17 Downloads

Conclusions

  1. 1.

    The experiments established the feasibility of mechanical finishing of pneumatic concrete linings, ensuring a roughness coefficient of n=0.011–0.012 for the lining surface.

     
  2. 2.

    To reduce the roughness of a pneumatic concrete lining, it is advisable to use a sand covering layer (Gunite).

     
  3. 3.

    The application of pneumatic concrete (including the covering layer) on a previously constructed primary lining of prefabricated or cast-in-place concrete should be performed in an automatied regimen, which produces a pneumatic concrete surface satisfactorily meeting the design specifications and leads to minimum waste from the shaping operation, the waste even being eliminated in many cases.

     
  4. 4.

    It is recommended that, for pneumatic concrete surfaces, use be made of the “anklepf” method for wall chambers and of the milling cutter method for tunnel walls and roofs, employing in the installation the corresponding interchangeable equipment.

     
  5. 5.

    For application of pneumatic concrete in the automated regimen, it is necessary to continue to improve the existing machine designs or to develop new ones which will ensure a more uniform discharge of the material from the nozzle.

     

Keywords

Milling Renewable Energy Source Hydraulic Engineer Design Specification Electrical Power Generation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Literature cited

  1. 1.
    N. I. Zinevich and A. A. Pogrebinskii, “Ways of perfecting the production of economical types of tunnel linings,” Gidrotekh. Stroit., No. 5 (1971).Google Scholar
  2. 2.
    N. I. Zinevich and A. A. Pogrebinskii, “Integrated mechanization for construction of pneumatic concrete linings in mine excavations,” Gorn. Zh., No. 1 (1976).Google Scholar
  3. 3.
    Yu. K. Fogel’, “Investigation of the roughness coefficient of hydroelectric plant tunnels,” in: Design and Construction of Hydraulic Tunnels and Underground Hydroelectric Plants [in Russian], Gosénergoizdat, Leningrad (1963).Google Scholar
  4. 4.
    Norms TUiN 34-55, Hydraulic Losses Due to Friction along Conduits of Hydroelectric Plants [in Russian], Gosénergoizdat, Leningrad (1956).Google Scholar

Copyright information

© Plenum Publishing Corporation 1979

Authors and Affiliations

  • N. I. Zinevich
  • A. G. Min’kov
  • A. S. Nikolaev
  • A. A. Pogrebinskii

There are no affiliations available

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