US3778876A - Method of making well-points for de-watering ground - Google Patents

Method of making well-points for de-watering ground Download PDF

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Publication number
US3778876A
US3778876A US00320805A US3778876DA US3778876A US 3778876 A US3778876 A US 3778876A US 00320805 A US00320805 A US 00320805A US 3778876D A US3778876D A US 3778876DA US 3778876 A US3778876 A US 3778876A
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US
United States
Prior art keywords
tubing
length
ground
wellpoint
sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00320805A
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English (en)
Inventor
R Allen
E Potter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henry Sykes Ltd
Original Assignee
Henry Sykes Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Henry Sykes Ltd filed Critical Henry Sykes Ltd
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Publication of US3778876A publication Critical patent/US3778876A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/10—Restraining of underground water by lowering level of ground water
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E02D3/103—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by installing wick drains or sand bags
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
    • E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
    • E03B3/08—Obtaining and confining water by means of wells
    • E03B3/16—Component parts of wells
    • E03B3/18—Well filters
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/08—Screens or liners
    • E21B43/084—Screens comprising woven materials, e.g. mesh or cloth
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/496—Multiperforated metal article making
    • Y10T29/49604—Filter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49789—Obtaining plural product pieces from unitary workpiece
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • 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.
  • Wellpoints are, of course, well known and most wellpoints are of the general kind described in our British Pat. No. 1,012,282. This known type of wellpoint is relatively expensive, as it must be robustly constructed of corrosion-resistant materials, and difficulty is frequently encountered in withdrawing the wellpoints from the ground after an operating period which may extend over several months or more. Also, the wellpoints, and particularly the filters, must usually be reconditioned before being used again.
  • a wellpoint comprising a tubular body of shapesustaining plastics material provided with a lower end closure and an upper end part arranged to receive a suction pipe, said body being formed with a series of filter openings, and a sleeve of synthetic fabric or the like surrounding the tubular body to filter water being drawn into the tubular body through said filter opening.
  • said tubular body has a diameter greater than said suction pipe and said upper end part comprises an end cap having a central opening to receive said pipe.
  • the invention also provides a tubular body as defined above for use in a wellpoint.
  • a method of producing a wellpoint for dewatering ground comprising taking from a supply a length of shape-sustaining plastics tubing formed with a series of filter openings, taking from a supply a length of imperforate shape-sustaining plastics tubing of a diameter substantially smaller than that of the perforated tubing, inserting an end length of the imperforate tubing into the upper end of the perforated tubing, effectively clos-- ing the still-open ends of the perforated tubing and securing a sleeve of synthetic fabric around the perforated tubing.
  • a method of dewatering ground comprising introducing a wellpoint as defined above into the ground by means of a hollow tubular casing in which the wellpoint is accommodated, the method including the step of easing the entry of the tubular casing into the ground by means of one or more water lances attached to or integral with the casing, the casing being extracted when the wellpoint has reached its required operating depth.
  • FIG. I is a partly sectional elevation showing a wellpoint according to the invention:
  • FIG. 2 is a diagrammatic sectional elevation showing the wellpoint illustrated in FIG. 1 accommodated in a placement casing provided with water pressure lances.
  • the wellpoint comprises a tubular body 10 consisting of a length of hard plastics tubing, for example P.V.C.
  • the tubing is formed with a spiral corrugation 11, and series of perforations 12 are formed in the trough of the corrugation to provide coarse filter openings.
  • An unperforated, lower end blanking cap 13 closes one end of the body 10 and.an upper end cap 14 formed with a central opening is arranged at the upper end of the body 10.
  • the end caps are also formed with spiral corrugations, and can thus be screwed onto, or in a modification into, the body 10.
  • a pipe 15 of similar plastics material having an angled bottom end 15A, extends through the upper end cap 14 to penetrate into and, as shown, along the complete length of the body 10.
  • the pipe 15 is also formed with a strengthening spiral corrugation and may be partly screwed into the opening in cap 14.
  • a sleeve of nylon fabric 16 encloses the body 10, the sleeve being knotted at 17 and being held closely around the pipe 15 where the latter enters cap 14, by means of a rubber ring 18.
  • the wellpoint shown in FIG. 1 is introduced into a tubular casing 19 shown in FIG. 2, and it will be noted that water pressure lances 20 are secured to the casing 19.
  • the casing 19 comprises a lower length of metal tube into which an upper length of smaller-diameter tube is force-fitted or welded.
  • the wellpoint is introduced into the ground by the scouring action of the water from the lances 20, which eases the passage of the casing 19 through the ground to be dewatered.
  • a certain amount of sand or soil may pass upwardly through the bore of the casing 19 and tend to stop the downward progress of the wellpoint, but such sand and soil are mixed with water to form a slurry and the resistance is not great; furthermore, the wellpoint is sufficiently rigid to be pushed down by pressure from ground level and, indeed, a metal or like rod may be passed through the tube 15 gently to engage the bottom end cap 13 and so assist downward movement of the wellpoint.
  • the pipe 15 is withdrawn.
  • the body may also be withdrawn but, since these bodies are relatively inexpensive, they will generally be regarded as disposable and will be left in position in the ground; indeed, more or less of the pipe 15, which is also inexpensive, may also be left in the ground if its extraction proves difficult.
  • the wellpoints can be produced on site from reels of corrugated tubing which forms the body 10, reels of corrugated or plain tubing which forms the pipe 15, and reels of nylon sleeve which forms the sleeve 16. It has been found satisfactory to employ a body 10 having a diameter of approximately 3 inches, and most known requirements can be met by varying the length and/or the diameter of the body 10; also, the degree of filtration can be chosen by selecting an appropriate mesh for the nylon sleeve 16. Furthermore, the materials employed in the wellpoint according to the present invention are lightweight and are corrosion and damp resistant for long periods of time in the ground and in storage.
  • the lower end of the (open) nylon sleeve may be tucked into the tubular body 10 and the end cap 13 then applied to hold the sleeve and render the knot 17 unnecessary; the upper end of the sleeve may likewise be tucked in and held by the cap 14.
  • the end cap 13, possibly together with the cap 14, may also be formed with perforations (if fabriccovered).
  • the end caps 13 and 14 may be formed of similar shape, the upper end cap then being cut, possibly on site, to receive the pipe 15.
  • the invention has so far been described in relationship to the dewatering of ground, but the same wellpoint and process may be employed for other purposes, such as providing a more or less temporary stand pipe for water-supply.
  • a method of producing a wellpoint for dewatering ground comprising taking from a supply a length of shape-sustaining plastics tubing formed with a series of filter openings, taking from a supply a length of imperforate shape-sustaining plastics tubing of a diameter substantially smaller than that of the perforated tubing, inserting an end length of the imperforated tubing into the upper end of the perforated tubing, effectively closing the still-open ends of the perforated tubing and securing a sleeve of synthetic fabric around the perforated tubing.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structural Engineering (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soil Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
US00320805A 1970-06-01 1973-01-03 Method of making well-points for de-watering ground Expired - Lifetime US3778876A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2638870A GB1357326A (en) 1970-06-01 1970-06-01 Wellpoints for de-watering ground

Publications (1)

Publication Number Publication Date
US3778876A true US3778876A (en) 1973-12-18

Family

ID=10242857

Family Applications (1)

Application Number Title Priority Date Filing Date
US00320805A Expired - Lifetime US3778876A (en) 1970-06-01 1973-01-03 Method of making well-points for de-watering ground

Country Status (10)

Country Link
US (1) US3778876A (es)
BE (1) BE767856A (es)
CA (1) CA938220A (es)
DE (1) DE2126387A1 (es)
ES (1) ES391770A1 (es)
FR (1) FR2095683A5 (es)
GB (1) GB1357326A (es)
NL (1) NL7107402A (es)
SE (1) SE383179B (es)
ZA (1) ZA713437B (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2555215B1 (fr) * 1983-11-23 1986-04-11 Induplast Sa Dispositif de recuperation d'un liquide
BE1004410A3 (nl) * 1989-08-29 1992-11-17 Smet Boring Nv Werkwijze en inrichting voor het reinigen van besmette of verontreinigde bodems.
DE102014007081A1 (de) * 2014-05-14 2015-11-19 Eduard Galinker Verfahren und Vorrichtung zur Gewinnung von Wasser aus dem feuchten Erdboden durch den Einsatz von Vakuum zwecks Trinkwassererzeugung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US560441A (en) * 1896-05-19 Hale to charles g
US1218848A (en) * 1916-07-01 1917-03-13 William H Foster Strainer for pumps.
US1229437A (en) * 1916-10-09 1917-06-12 William H Foster Strainer.
US1367406A (en) * 1920-03-01 1921-02-01 Mclean Marrs Well-screen
US2046456A (en) * 1933-09-11 1936-07-07 Edward E Johnson Inc Well point and process of making the same
US2969840A (en) * 1957-04-10 1961-01-31 Ranney Method Water Supplies I Plastic well screen and wells utilizing the screens and method of operation
US3221819A (en) * 1964-05-01 1965-12-07 Richard E Dickinson Well screen
US3638726A (en) * 1969-11-05 1972-02-01 David L Sibley Well screens

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US560441A (en) * 1896-05-19 Hale to charles g
US1218848A (en) * 1916-07-01 1917-03-13 William H Foster Strainer for pumps.
US1229437A (en) * 1916-10-09 1917-06-12 William H Foster Strainer.
US1367406A (en) * 1920-03-01 1921-02-01 Mclean Marrs Well-screen
US2046456A (en) * 1933-09-11 1936-07-07 Edward E Johnson Inc Well point and process of making the same
US2969840A (en) * 1957-04-10 1961-01-31 Ranney Method Water Supplies I Plastic well screen and wells utilizing the screens and method of operation
US3221819A (en) * 1964-05-01 1965-12-07 Richard E Dickinson Well screen
US3638726A (en) * 1969-11-05 1972-02-01 David L Sibley Well screens

Also Published As

Publication number Publication date
ZA713437B (en) 1972-01-26
GB1357326A (en) 1974-06-19
ES391770A1 (es) 1975-05-16
BE767856A (fr) 1971-10-18
NL7107402A (es) 1971-12-03
CA938220A (en) 1973-12-11
SE383179B (sv) 1976-03-01
FR2095683A5 (es) 1972-02-11
DE2126387A1 (es) 1971-12-09

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