Ground freezing method

Details Ground freezing method Ground freezing method

1972-11-06

1976-03-16

Shapiro, Jacob

Heat exchange

With valve or movable deflector for heat exchange fluid flow

With by-pass of heat exchanger or heat exchanger section

62260, 165 45, E02D 312, B25G 108

Patent

active

039437221

ABSTRACT:
An apparatus and method of freezing a large volume of ground for tunnel construction and the like utilizing liquified nitrogen is described. The apparatus consists generally of a series of freeze pipes embedded in the ground, each of the freeze pipes consisting of a conductor tube and an inner header tube. The header tube of each of the succeeding freeze pipes in the series have discharge holes of a predetermined cross-section so that greater control of gaseous and liquified nitrogen pressure can be maintained throughout the system. By means of this method and apparatus more accurate control of ground freezing can be made by merely controlling the inlet liquified nitrogen pressure and the exhaust gaseous nitrogen temperature.

REFERENCES:
patent: 768774 (1904-08-01), Schmidt
patent: 786382 (1905-04-01), Reno
patent: 907441 (1908-12-01), Baur
patent: 3528252 (1970-09-01), Gail
"Liquid Gas Freezes Bad Soil" from Construction Methods and Equipment, July 1964, p. 85.

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