WELL-POINTS FOR DE-WATERING GROUND

• US 3,814,184 A
• Filed: 04/05/1973
• Issued: 06/04/1974
• Est. Priority Date: 06/01/1970
• Status: Expired due to Term

• Current Assignee: Ernest William Potter, Ronald Noel Allen
• Original Assignee: Ernest William Potter, Ronald Noel Allen
• Inventors: Potter, Ernest William, Allen, Ronald Noel
• Primary Examiner(s): Brown, David H.
• Application Number:
  US05/348,459
• Time in Patent Office: 425 Days
• Field of Search: 166/228,230,227,233,231,236
• US Class Current: 166/230
• CPC Class Codes: E02D 19/10 by lowering level of ground water installation for obtaining or collecting drinking water E03B3/00
• CPC Class Codes: E02D 3/103 by installing wick drains or sand bags
• CPC Class Codes: E03B 3/18 Well filters filters in general B01D24/00 - B01D35/00
• CPC Class Codes: E21B 43/084 Screens comprising woven materials, e.g. mesh or cloth
• CPC Class Codes: E21B 7/18 Drilling by liquid or gas jets, with or without entrained pellets E21B7/14 takes precedence
• CPC Class Codes: E21B 7/20 Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Abstract

A disposable wellpoint for dewatering ground comprises a body of spirally-corrugated perforated tubing formed of plastics material and covered by a filter sleeve of nylon fabric, and a suction pipe of spirally corrugated tubing enters the top end of the body. The body, the sleeve, and the suction pipe can be severed as lengths from supply reels on site, and the assembled wellpoints can be introduced into the ground in a tubular casing provided with water lances.

Claims

1. A wellpoint comprising a tubular body of shape-sustaining plastics material provided with a corrugated surface configuration, a separable lower end closure part having a corrugated surface in interleaved engagement with the corrugations of said tubular body for closing the lower end of said body;

a separable upper end part having a corrugated surface configuration in interleaved engagement with the corrugations of said tubular body adjacent the upper end of said body, said upper end part defining a central opening, an elongated separable suction pipe extending through said opening into said body substantially along the axis of said tubular body, said suction pipe having a corrugated surface in engagement with the edge of said opening, said body being formed with a series of filter openings, and a sleeve of synthetic fabric surrounding the tubular body and having portions which are separably attached to said wellpoint adjacent said lower end closure part and upper end part respectively to filter water being drawn by said suction pipe into the tubular body through said filter openings.

2. A wellpoint as claimed in claim 1, in which said tubular body has a diameter greater than that of said suction pipe, said filter openings being defined in the troughs of the corrugations in said tubular body.

3. A wellpoint as claimed in claim 1 in which said tubular body and said suction pipe comprise lengths of hard plastics tubing.

4. A wellpoint as claimed in claim 1, in which said lower end closure part comprises an end cap which is screwed onto the exterior of said tubular body.

5. A wellpoint as claimed in claim 1 in which said upper end part comprises an end cap which is screwed onto the exterior of said tubular body.

6. A wellpoint as claimed in claim 1, in which said suction pipe extends along substantially the entire length of said tubular body, said suction pipe having an angled bottom end positioned adjacent said lower end closure part. 7. The wellpoint of claim 1 wherein the corrugations in said tubular body, in said lower end closure part, in said upper end part, and in said suction pipe are all of spiral form.

8. A wellpoint as claimed in claim 1 in which said sleeve comprises a length of tubular, open-ended nylon fabric closely fitted at its upper end around said suction pipe above said top end part and having its lower end closed in engagement with said lower end closure part.

9. The wellpoint of claim 8 wherein the upper end of said sleeve is retained in place by means of a flexible ring surrounding said suction pipe.

10. The wellpoint of claim 8 wherein the lower end of said sleeve is closed by a knot in said fabric below said lower end closure part.