Device for the control of the internal pressure in a drill pipe

Details Device for the control of the internal pressure in a drill pipe Device for the control of the internal pressure in a drill pipe

1980-02-04

1981-10-20

Corbin, David H.

Hydraulic and earth engineering

Foundation

Columnar structure

91 50, E02D 1504

Patent

active

042957591

ABSTRACT:
A device for the control of the internal pressure in a drill pipe or tremie is disclosed. The tremie is used in footings and especially in the construction of compressed concrete footings. The tremie has a valve located in a lid that serves for the tight seal of the tremie. The valve is subjected to a counter-pressure which is greater than the effective power of the internal pressure of the tremie. A hoisting cable is connected to the valve stem and the power of the hoisting cable under normal operating conditions in combination with the internal pressure of the tremie is large enough to overcome the counterpressure. The valve is shifted to vent the internal pressure of the tremie when the same is rapidly removed from the footing bore due to a decrease in ground friction.

REFERENCES:
patent: 2996888 (1961-08-01), Rice
patent: 3130552 (1964-04-01), Bodine
patent: 3216328 (1965-11-01), Peterson
patent: 3385070 (1968-05-01), Jackson
patent: 4044844 (1977-08-01), Harris et al.
patent: 4158518 (1979-06-01), Rusche

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