Pumps – Processes
Patent
1977-11-22
1979-11-06
Freeh, William L.
Pumps
Processes
417900, 417431, 198675, 405146, 405147, F04B 1500, E02D 1502
Patent
active
041734300
ABSTRACT:
A novel method of injecting a back filling injection material employed in a shield-forming process is described herein. A screw type injection pump with a hopper connected to its intake port is utilized. This pump is rotated in a reverse direction to intake a back filling material into said hopper through a delivery hose connected to its delivery port. The upper limit pressure and a lower limit pressure for the injection pump are set for injection of the back filling material. The injection pump is next rotated in its normal direction to inject the back filling material to a desired location through the delivery hose, and then, after completion of the injection filling of the back filling material, the injection pump is rotated in a reversed direction again to intake water through the delivery hose, thereby washing of the hose and the injection pump can be effected.
REFERENCES:
patent: 2485208 (1949-10-01), Longenecker
patent: 2606645 (1952-08-01), Heine
patent: 2995901 (1961-08-01), Kemper
patent: 3465685 (1969-09-01), Sherrod
patent: 3667878 (1972-06-01), Reeve
patent: 4008012 (1977-02-01), Page
Freeh William L.
Sato Kogyo Kabushiki Kaisha
LandOfFree
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