Tube profile gage

Measuring and testing – Miscellaneous

Patent

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Details

33 1H, 33125B, G01C 504

Patent

active

040032639

ABSTRACT:
To measure compressions and settlements in the foundations of heavy structures, a continuous loop of tubing is installed within the foundation of the structure, with the open ends of the loop brought to a convenient, accessible terminal point. A liquid interface between a heavy density fluid and a light density fluid is moved through the tubing, the particular fluid on either side of the interface being continuous back to the terminal. The pressure difference resulting from the difference in densities of the two fluids, and the changes in height between the fluid interface within the tubing and the constant upper surface of the driving heavy density fluid in the terminal, is sensed by a pressure transducer fitted within the terminal to the light density fluid in the discharge leg of the loop. The output of the pressure transducer is connected to a commercial strip chart recorder to obtain a scale plot of the existing relative elevation profile of the tubing within the structure's foundation, referenced to the absolute elevation of the constant upper surface of the heavy density fluid in the terminal. By periodic operation of the fluids through the tubing loop, in conjunction with a check of the absolute elevation of the terminal by other means, such as surveys, the time-related settlement of the foundation under the structural load may be monitored.

REFERENCES:
patent: 3538608 (1970-11-01), Bronson
patent: 3561127 (1971-02-01), DuBose
patent: 3949484 (1976-04-01), Cluley et al.

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