Title: Self-contained instrument for measuring subterranean tunnel wall deflection

Abstract: 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.

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Inventors: Rasmussen, Donald Edgar (Kennewick, WA, US)
Hof, Jr., Peter John (Richland, WA, US)

Application Number: 710518
Filing Date: 1976-08-02
Publication_date: 1978-05-30
Assignee: The United States of America as represented by the Secretary of the (Washington, DC)
Primary Class(es): 234/115 83/229, 234/130
Other Classes:
US Patent Ref:

266593	Oct, 1882	Johnson	83/227.
3051376	Aug, 1962	Oldenburg et al.	234/115.
3104053	Sep, 1963	Rabinow	234/115.
3289509	Dec, 1966	Cahill	83/227.
3307781	Mar, 1967	Jone, Jr.	234/115.
3536256	Oct, 1970	Purps	234/115.

Other Refs:
Primary Examiner: Meister, J. M.
Assistant Examiner:
Attorney: Sadowsky; Gersten, Gardiner; Donald A.