Well pipe extraction apparatus
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsJames E. Osgood, William R. Major
Life of this patent
Estimating the term…
Abstract
A well pipe extraction apparatus for removing a groundwater monitoring well consisting of PVC pipe from the ground. The well pipe extraction apparatus includes a wire rope, a soft eye formed at an upper end of the wire rope and knurled brass rod attached to the opposite end of the wire rope. The knurled brass rod is lowered to the bottom end of the well casing. An operator pours sand particles down the well casing. The sand particles wedge in-between groves within the brass rod and the interior surface of the well casing locking brass rod to the well casing which allows the operator to extract the PVC pipe from the ground.
Claims15
A well pipe extraction apparatus for removing a groundwater monitoring well fabricated from PVC pipe from the ground without separating and breaking said PVC pipe, said well pipe extraction apparatus comprising:
- a wire rope having a predetermined length;
- a soft eye formed at one end of said wire rope, said soft eye being removably coupled to a hook from an external hosting device;
- a knurled brass rod attached to the opposite end of said wire rope, said knurled brass rod having a cylindrical shaped body and a taper at an upper end thereof, said knurled brass rod having a plurality of grooves which extend from the lower end of said cylindrical shaped body to the taper of said knurled brass rod;
- said knurled brass rod being positioned within said PVC pipe at a bottom end of said PVC pipe, the grooves of said knurled brass rod receiving sand particles pored down said PVC pipe, said sand particles being wedged between the grooves of said knurled brass rod and an interior surface of said PVC pipe, locking the bottom end of said knurled brass rod to said PVC pipe to allow said external hoisting device to remove said PVC pipe from the ground without separating and breaking sad PVC pipe;
- and
- said PVC pipe being hoisted from the ground from the bottom end hereof to prevent separation and breakage of said PVC pipe as said PVC pipe is being removed from the ground by said external hoisting device.
A well pipe extraction apparatus for removing a groundwater monitoring well fabricated from PVC pipe from the ground without separating and breaking said PVC pipe, said well pipe extraction apparatus comprising:
- a wire rope having a predetermined length;
- a soft eye formed at one end of said wire rope, said soft eye being removably coupled to a hook from an external hosting device;
- a knurled brass rod attached to the opposite end of said wire rope, said knurled brass rod having a cylindrical shaped body and a taper at an upper end thereof, said knurled brass rod having a plurality of grooves which extend from the lower end of said cylindrical shaped body to the taper of said knurled brass rod;
- said knurled brass rod being positioned within said PVC pipe at a bottom end of said PVC pipe, wherein a difference between an outer diameter for said knurled brass rod and an inner diameter for said PVC pipe is approximately 0.011 inches;
- the grooves of said knurled brass rod receiving sand particles pored down said PVC pipe, said sand particles being wedged between the grooves of said knurled brass rod and an interior surface of said PVC pipe, locking said knurled brass rod to said PVC pipe to allow said external hoisting device to remove said PVC pipe from the ground without separating and breaking said PVC pipe;
- and
- said PVC pipe being hoisted from the ground from the bottom end thereof to prevent separation and breakage of said PVC pipe as said PVC pipe is being removed from the ground by said external hoisting device.
A method for removing a groundwater monitoring well fabricated from PVC pipe from the ground without separating an breaking said PVC pipe comprising the steps of:
- (a) positioning a knurled brass rod attached to one end of a wire rope within said PVC pipe at a bottom end of said PVC pipe;
- (b) pouring approximately eight ounces of sand particles in a downward direction within said PVC pipe to the bottom end of said PVC pipe;
- (c) waiting a predetermined time period for said sand particles to settle within a plurality of grooves formed around an outer surface of said knurled brass rod after said knurled brass rod is positioned at the bottom end of said PVC pipe;
- (d) attaching a soft eye located at the other end of said wire rope to a hook for an external hoisting device;
- (e) applying tension to said wire rope to wedge said sand particles between said knurled brass rod and an interior surface of said PVC pipe to lock said knurled brass rod to the bottom end of said PV pipe;
- (f) providing a steady pull in an upward direction to said knurled brass rod to remove said PVC pipe from the ground without separating and breaking said PVC pipe as said PVC pipe is pulled in said upward direction by said external hoisting device;
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- (g) separating sections of said PVC pipe from said wire rope during the removal of said PVC pipe from the ground.
The method of claim further comprising the step of supplying water to the bottom end of said PVC pipe through a slot located at the bottom end of said PVC pipe to allow for the removal of said knurled brass rod from a last section of said PVC pipe after said PVC pipe is completely removed from the ground, said sand particles being removed from said PVC pipe by the water supplied through said slot to unlock said knurled brass rod from the bottom end of said PVC pipe.
Dependencies are inferred from the claim text.