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Technical Note (National Research Council of Canada. Division of Building
Research), 1963-07-01
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Readings of Settlement at the Queensway Overpass Structures at
Metcalfe and Elgin Streets, Ottawa
Burn, K. N.
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DIVISION OF BUILDING RESEARCH
No.
NATIONAL RESEARCH COUNCIL OF CANADA
400
NOTlE
'f
EClHI N ][CAlL
PREPARED BY K. N. Burn CHECKED BY CBC APPROVED BY NBH
July 1963
PREPARED FOR
Department of Highways of Ontario; De Leuw'Cather and Co. of Canada; and the City of Ottawa.
SUBJECT
READINGS OF SETT LEMENT AT THE QUEENSW A Y OVERPASS STRUCTURES AT METCALFE AND ELGIN STREETS, OTTAWA
This note describes the installations of reference points and deep bench marks and the method of readings used in the measurement of
settlements at these two overpass structures. It includes a table for the
compiling of results which will be sent to the above parties after each survey.
Instrumentation
The instrumentation for these bridge structures was installed in accordance with plans outlined in a previous technical note, TN 381,
Sept. 1962. One-inch reinforcing bars placed vertically in the footings
and protruding an inch above the upper surface were used as reference
points until the structures were completed. Steel sockets were then
placed in the abutment walls at levels about 2 ft above finished sidewalk elevations, by boring holes slightly larger than the sockets and setting
them in neat cement. The locations of these reference points are shown
2
-Deep Bench Marks
Two deep bench marks were installed, one at each of the two
overpass sites and placed as near as possible to the structures. Details
of bench mark installations have been described (1). The actual depths
of the bench mark tips are 81 ft at Metcalfe Street and 85 ft at Elgin Street; their locations are shown in Figures 1 and 2.
Elevations relative to BM 26 (De Leuw Cather) assumed to be 300.000 cm were established and are as follows:
DBM 10 (Metcalfe St. ) 366.981 cm
DBM 11 (Elgin St. ) 329.459 cm
(It should be noted that the final elevation of these DBMs will be adjusted by cutting down to ground level when grading of the project is complete. )
Level Surveys
Readings of settlement will be obtained periodically during construction and at intervals of time ther eafter until it appear s that
settlement is complete. An engineer's optical level will be used to take
the readings of settlement relative to the nearest deep bench mark. A letter
will be mailed to each of the parties involved, giving the total settlement
to date at each station. A table is included for the compilation of these
readings.
Reference
(1) Bozozuk, M., G. H. Johnston and J. J. Hamilton. Deep bench marks in
clay and permafrost areas. Presented at the Annual Meeting of
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