Static structures (e.g. – buildings) – Land marker or monument
Patent
1981-01-27
1983-09-13
Murtagh, John E.
Static structures (e.g., buildings)
Land marker or monument
405130, 405211, E01F 902, E04H 1300
Patent
active
044034598
ABSTRACT:
Method and apparatus for installing a benchmark in an arctic region to provide an accurate, reliable reference point even after prolonged periods of exposure. To install the benchmark, a hole is formed through the active layer and into the underlying layer. An alignment jig mounts a marker element in a casing and both are positioned into the hole. A leveling clamp on the casing is used to plump and adjust the marker element to a known elevation. The marker element extends to the bottom of the hole while the casing terminates at a depth which is above the bottom of the hole but below the bottom of the active layer. A settable material, e.g. sand-water slurry which will freeze at ambient conditions, is poured into the hole to a point just above the lower end of the casing and is allowed to set after which the remainder of the hole around the casing is filled. The annulus within the casing around the marker element is filled with fluidic material which will not freeze under ambient conditions, e.g. grease. Since the marker element does not directly contact any part of the active layer, the marker element is effectively isolated from contact therewith so that the thawing and refreezing of the active layer do not disturb the position or elevation of the benchmark. Temperature sensors, positioned along the marker element, provides temperature readings for which expansion coefficients are known which, in turn, are used to correct the actual elevational readings taken during a survey.
REFERENCES:
patent: 608797 (1898-08-01), Runyon
patent: 837820 (1906-12-01), Folsom et al.
patent: 3166041 (1965-01-01), Caggainello
patent: 3720065 (1973-03-01), Sherard
patent: 3859800 (1975-01-01), Wuelpern
patent: 3921410 (1975-11-01), Philo
patent: 3926259 (1975-12-01), Perkins
patent: 4102194 (1978-07-01), Eng
"Sealed Tube Keeps Frost Frozen to Hold Buildings" Engineering News-Record, Jul. 3, 1969, p. 16.
Atlantic Richfield Co.
Faulconer Drude
Murtagh John E.
Sofia Mark J.
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