Self-contained instrument for measuring subterranean tunnel wall deflection

Patent · 01 January 1978

OSTI ID:863098

Rasmussen, Donald Edgar ^[1]

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1. Kennewick, WA

The deflection of a subterranean tunnel is measured with a rod-like, self-contained instrument that is adapted to be inserted into a radially extending bore of the tunnel adjacent an end of the tunnel where the tunnel is being dug. One end of the instrument is anchored at the end of the bore remote from the tunnel wall, while the other end of the intrument is anchored adjacent the end of the wall in proximity to the tunnel wall. The two ends of the instrument are linearly displaceable relative to each other; the displacement is measured by a transducer means mounted on the instrument. Included in the instrument is a data storage means including a paper tape recorder periodically responsive to a parallel binary signal indicative of the measured displacement.

• Research Organization: BATTELLE MEMORIAL INSTITUTE
• DOE Contract Number: AC06-76RL01830
• Assignee: United States of America as represented by Secretary of (Washington, DC)
• Patent Number(s): US 4091990
• OSTI ID: 863098
• Country of Publication: United States
• Language: English

Related Subjects

/234/83/
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