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Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores
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Advanced high pressure hyperbaric techniques in tunnelling.

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Tunneling and diving involve working under elevated pressure. This paper details hyperbaric tunneling methods, comparing them to diving techniques for underwater construction projects.

Keywords:
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Area of Science:

  • Occupational health and safety
  • Hyperbaric engineering
  • Marine construction

Background:

  • Compressed air work and diving have existed since the mid-19th century.
  • Both fields involve occupational activities under elevated pressure.
  • Advancements in mixed gas breathing and saturation exposure techniques are crucial for both.

Purpose of the Study:

  • To explain hyperbaric work in tunneling, particularly for large-diameter underwater road tunnels.
  • To illustrate the hyperbaric activities involved in such construction.
  • To explore practical differences between compressed air work and diving.

Main Methods:

  • Review of hyperbaric tunneling techniques.
  • Analysis of saturation exposure and mixed gas breathing applications.
  • Comparative study of compressed air work and diving practices.

Main Results:

  • Tunneling has progressed to meet demands for 'higher pressure for longer' exposures.
  • Saturation exposure and mixed gas breathing are essential in both fields.
  • Significant practical differences exist between compressed air work and diving.

Conclusions:

  • Hyperbaric tunneling, especially for underwater projects, requires advanced techniques similar to diving.
  • Understanding these techniques and their differences is vital for safety and efficiency.
  • The paper provides insights into the engineering and operational aspects of high-pressure work in tunneling.