E - Fixed Constructions – 02 – F
Patent
E - Fixed Constructions
02
F
E02F 5/18 (2006.01) E21B 7/20 (2006.01) E21B 7/28 (2006.01) F16L 1/06 (2006.01)
Patent
CA 2196711
This invention relates to installing sections of horizontally laid underground piping using a coring rod to pull or push a coring knife horizontally through the site. During tunnel diameter enlargment, when the coring knife is pushed into the exit pit, the coring rod and coring knife will fall to the exit pit's bottom. The invention is a coring rod support wheel that has a relatively large smooth outer surface and a hollow hub rigidly held within it. The axis of the hollow hub is parallel to the axis of the wheel, but not necessarily the same as the axis of the wheel. The diameter of the hub allows a coring rod to slide freely through it. Once the coring rod has been slid through the hub, the coring rod and any attached coring knife are supported and guided by the wheel to prevent them from falling to the exit pit's bottom, and to keep them on the correct path during tunnel diameter enlargment.
Atkins Underground L.p.
Brown David M.
Na
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