Systems and methods for localized compressed air operations

WO2026063941A1PCT designated stage Publication Date: 2026-03-26PI ENGINEERING INC
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-09-20
Publication Date
2026-03-26

AI Technical Summary

Technical Problem

Traditional tunneling techniques for constructing cross passages are labor-intensive, dangerous, expensive, and environmentally risky, often requiring ground treatment which is costly and poses regulatory challenges, especially in unstable subaqueous conditions.

Method used

A mobile, self-contained hyperbaric pressure vessel with a working chamber, airlocks, and a support system that allows localized excavation of cross passages using compressed air, eliminating the need for ground treatment and enabling safe, efficient construction in unstable ground conditions.

Benefits of technology

Enables cost-effective, safe, and environmentally friendly construction of cross passages without ground treatment, reducing operational costs and environmental impact while maintaining the main tunnel in atmospheric conditions.

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Abstract

Systems, methods, and apparatuses related to localized excavation using compressed air are disclosed. A pressure vessel may include a working chamber having an inner space for personnel and equipment, and an opening on the working chamber that surrounds an area for excavation of a second passageway. The main passageway may be a first excavation path and the second passageway may be a second excavation path in a direction different than the first excavation path. A sealing frame, secured to the pressure vessel, forms an airtight seal with the main passageway when positioned around the area for excavation. A load reaction structure stabilizes a position of the pressure vessel in the main passageway and maintains the airtight seal during pressurization. A controller may manage pressure within the pressure vessel during excavation operations.
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Citation Information

Patent Citations

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    CN112360477A

  • Duct piece breaking device and connection channel construction system and method

    CN113622929A

  • Apparatus for driving transverse galleries or the like running transversely to a tunnel, in particular connecting galleries between two tunnel tubes running essentially parallel to one another

    DE3810398A1

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    DE3907678A1

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    US4388021A