Head assembly for multiposition borehole extensometer
Abstract
A head assembly for a borehole extensometer and an improved extensometer for measuring subsurface subsidence. A plurality of inflatable anchors provide discrete measurement points. A metering rod is fixed to each of the anchors which are displaced when subsidence occurs, thereby translating the attached rod. The head assembly includes a sprocket wheel rotatably mounted on a standpipe and engaged by a chain which is connected at one end to the metering rod and at the other end to a counterweight. A second sprocket wheel connected to the standpipe also engages the chain and drives a connected potentiometer. The head assembly converts the linear displacement of the metering rod to the rotary motion of the second sprocket wheel, which is measured by the potentiometer, producing a continuous electrical output.
- Inventors:
-
- Livermore, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 864546
- Patent Number(s):
- 4382335
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- head; assembly; multiposition; borehole; extensometer; improved; measuring; subsurface; subsidence; plurality; inflatable; anchors; provide; discrete; measurement; metering; rod; fixed; displaced; occurs; translating; attached; sprocket; wheel; rotatably; mounted; standpipe; engaged; chain; connected; counterweight; engages; drives; potentiometer; converts; linear; displacement; rotary; motion; measured; producing; continuous; electrical; output; linear displacement; head assembly; rotatably mounted; rotary motion; electrical output; provide discrete; measuring subsurface; continuous electrical; surface subsidence; borehole extensometer; /33/
Citation Formats
Frank, Donald N. Head assembly for multiposition borehole extensometer. United States: N. p., 1983.
Web.
Frank, Donald N. Head assembly for multiposition borehole extensometer. United States.
Frank, Donald N. Sat .
"Head assembly for multiposition borehole extensometer". United States. https://www.osti.gov/servlets/purl/864546.
@article{osti_864546,
title = {Head assembly for multiposition borehole extensometer},
author = {Frank, Donald N},
abstractNote = {A head assembly for a borehole extensometer and an improved extensometer for measuring subsurface subsidence. A plurality of inflatable anchors provide discrete measurement points. A metering rod is fixed to each of the anchors which are displaced when subsidence occurs, thereby translating the attached rod. The head assembly includes a sprocket wheel rotatably mounted on a standpipe and engaged by a chain which is connected at one end to the metering rod and at the other end to a counterweight. A second sprocket wheel connected to the standpipe also engages the chain and drives a connected potentiometer. The head assembly converts the linear displacement of the metering rod to the rotary motion of the second sprocket wheel, which is measured by the potentiometer, producing a continuous electrical output.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1983},
month = {Sat Jan 01 00:00:00 EST 1983}
}