Wells – Screens – Porous material
Patent
1975-04-03
1976-06-29
Leppink, James A.
Wells
Screens
Porous material
166235, 166236, E03B 318, E21B 4308
Patent
active
039659810
ABSTRACT:
A pre-packed well point is provided having a central tube perforated only at the bottom end thereof. Coaxial with the inner tube is an outer screen and the inner and outer tubes are joined by suitable top and bottom end caps. Packed between the outer screen and the inner tube is a mass of particulate matter, such as gravel, glass nodules, activated carbon, polypropylene or, preferably, perlite. The pre-packed well point is inserted in the ground into position by vertically augering into the ground utilizing a hollow auger whose inner diameter is slightly larger than the outer diameter of the pre-packed well point. The bottom of the hollow auger is a separable bit. The hollow auger is driven into place by a portable drive mechanism mounted on a vehicle. When the hollow auger is driven, it drills a hole into the ground, with the spiral channels removing the dirt from the hole as it is being formed. When the auger reaches the desired depth, it is raised a short distance from the bottom of the hole. Then, the pre-packed well point is dropped through the hollow center of the auger. When the pre-packed well point hits the separable bit, it opens the bottom of the auger and the pre-packed well point falls to the bottom of the hole. Thence the auger is rotated and pulled out of the hole. As it is so rotated, the dirt in the spiral channels of the auger and the hole packs around the outside of the pre-packed well point which remains in place. After the hollow auger is totally removed, vacuum is applied to the inner tube of the pre-packed well point to pump water through the bottom perforations which draws water from the water tables, through the outer screen, and thence downwardly through the gravel into the inner tube in the same manner as prior art well points.
REFERENCES:
patent: 1256830 (1918-02-01), Rodrigo
patent: 1291288 (1919-01-01), Van Ness
patent: 1356187 (1920-10-01), Burgard
patent: 2167191 (1939-07-01), Vietti et al.
patent: 2257344 (1941-09-01), Maloney
patent: 2525897 (1950-10-01), Greene
patent: 2796939 (1957-06-01), Woodruff
patent: 2981333 (1961-04-01), Miller et al.
patent: 3327859 (1967-06-01), Pall
patent: 3556222 (1971-01-01), Lumpkin et al.
patent: R7721 (1877-06-01), Dean
The "Condensed Chemical Dictionary", pp. 867, 6th Ed. (1964) Reinhold Pub. Co., London.
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