CA1092326A - Method of covering corrugated drainage tubes - Google Patents
Method of covering corrugated drainage tubesInfo
- Publication number
- CA1092326A CA1092326A CA330,261A CA330261A CA1092326A CA 1092326 A CA1092326 A CA 1092326A CA 330261 A CA330261 A CA 330261A CA 1092326 A CA1092326 A CA 1092326A
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- knit fabric
- tubular knit
- valleys
- tube
- 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
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
METHOD OF COVERING CORRUGATED
DRAINAGE TUBES
ABSTRACT
A method of covering a corrugated drainage tube of the type having alternating peaks and valleys and a plurality of openings in selected valleys arranged along the longitudinal axis of the tube, said method comprising the steps of knitting a length of tubular knit fabric of less diameter than a maximum diameter of the corrugated tube, drawing the tubular knit fabric onto the tube under tension, and relaxing the tubular knit fabric to conform to the surface configuration of the corrugated tube.
DRAINAGE TUBES
ABSTRACT
A method of covering a corrugated drainage tube of the type having alternating peaks and valleys and a plurality of openings in selected valleys arranged along the longitudinal axis of the tube, said method comprising the steps of knitting a length of tubular knit fabric of less diameter than a maximum diameter of the corrugated tube, drawing the tubular knit fabric onto the tube under tension, and relaxing the tubular knit fabric to conform to the surface configuration of the corrugated tube.
Description
r. -;~û923;~i .
.,~ .
METHOD OF COVERING CORRUGATED
DRAINAGE TUBES
.. ... .
- BACKGROUND OF THE INVENTION
.... _ _ In recent years, the drainage pipe industry has developed new types of flexible corrugated drainage ` and irrigation tubing wherein the wall thereof includes ;
alternating annular peaks and valleys and a plurality of peripheral slottèd openings arranged transverseiy to the ~ . , .
~- longitud1nal axis of the tube. The Sixt U.S~ Pa-tent Number 3,699,684 discloses that such drainage tubes can be : . . , ~
coiled on a drum such as its shipping conta1ner and simply ~ `
fed down lnto a trench immed1at~ely~after it 15 dug.
~- A sheet of flexible water-repellent material~may be ~placed over the; area of the tube in which the slotted ~ ;
~open1ngs are located. Alternatively a sheet of flne filtering material may be us~ed instead of the water-repellent~material.
Such a combination is not entirely satisfactory since the tube must be put 1n place and then the sheet 20;~ of water-repellent material or~filter material~po~sitioned in its proper place. ~Alternatively, it might be possible `
to permanently~or semi-permanently attach the water-repellent material or filter material to the tube; however, ; these tubes must be transport~d; stacked,~and dragged` i ~
: : ~ ~ :,: .
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, '~ ,' , across fielcls. In doing so, such a type of filtering material would become disloclged or removed.
Also, United States Patents Numbers 2,763,991 and 2,050,020 show systems similar to that of the aforementioned Sixt patent, however, are objectionable for one reason or another.
SUM~ARY OF THE INVENTION
..
The present invention, on the other hand, ~ -provides an improved sleeve which completely encircles the flexible drainage pipe with a cylindrical or tubular length of relatively elastic, knit fabric material. The sleeve is of a diameter, in the relaxed ~ ;
~- condition, less than the diameter of the dr~ainage tube.
i Further, the knit fabric is preferably of~non-run -........................... , ~ , :
-. 15 construction to prevent running if a snag occurs.
The sleeve may be assembled~on the pipe anywhere, even - in the factory, and once emplaced, will not become - dislodged, removed or torn away.
~ .~ , ,.
~ In general, due to the inherent elasticity ~ ;
.. . .. . .
- 20 of the knit fabric, the tubular sleeve of the present ,~
~ invention provides a corrugated flexible drain pipe ,, I
with a protective covering which is easily assembled on the pipe. Moreover~ during transportation and ~ movement of the pipe in the field, the sleeve will - 25 remain snugly in place, generally conforming to the ,; , configuration of the pipe, thereby preventing damage to the sleeve.
. ~ .
. . :
.,~ .
METHOD OF COVERING CORRUGATED
DRAINAGE TUBES
.. ... .
- BACKGROUND OF THE INVENTION
.... _ _ In recent years, the drainage pipe industry has developed new types of flexible corrugated drainage ` and irrigation tubing wherein the wall thereof includes ;
alternating annular peaks and valleys and a plurality of peripheral slottèd openings arranged transverseiy to the ~ . , .
~- longitud1nal axis of the tube. The Sixt U.S~ Pa-tent Number 3,699,684 discloses that such drainage tubes can be : . . , ~
coiled on a drum such as its shipping conta1ner and simply ~ `
fed down lnto a trench immed1at~ely~after it 15 dug.
~- A sheet of flexible water-repellent material~may be ~placed over the; area of the tube in which the slotted ~ ;
~open1ngs are located. Alternatively a sheet of flne filtering material may be us~ed instead of the water-repellent~material.
Such a combination is not entirely satisfactory since the tube must be put 1n place and then the sheet 20;~ of water-repellent material or~filter material~po~sitioned in its proper place. ~Alternatively, it might be possible `
to permanently~or semi-permanently attach the water-repellent material or filter material to the tube; however, ; these tubes must be transport~d; stacked,~and dragged` i ~
: : ~ ~ :,: .
- : ::
., ~ . : ~: :.
:!
~: .
~923Z6 , ~:
, '~ ,' , across fielcls. In doing so, such a type of filtering material would become disloclged or removed.
Also, United States Patents Numbers 2,763,991 and 2,050,020 show systems similar to that of the aforementioned Sixt patent, however, are objectionable for one reason or another.
SUM~ARY OF THE INVENTION
..
The present invention, on the other hand, ~ -provides an improved sleeve which completely encircles the flexible drainage pipe with a cylindrical or tubular length of relatively elastic, knit fabric material. The sleeve is of a diameter, in the relaxed ~ ;
~- condition, less than the diameter of the dr~ainage tube.
i Further, the knit fabric is preferably of~non-run -........................... , ~ , :
-. 15 construction to prevent running if a snag occurs.
The sleeve may be assembled~on the pipe anywhere, even - in the factory, and once emplaced, will not become - dislodged, removed or torn away.
~ .~ , ,.
~ In general, due to the inherent elasticity ~ ;
.. . .. . .
- 20 of the knit fabric, the tubular sleeve of the present ,~
~ invention provides a corrugated flexible drain pipe ,, I
with a protective covering which is easily assembled on the pipe. Moreover~ during transportation and ~ movement of the pipe in the field, the sleeve will - 25 remain snugly in place, generally conforming to the ,; , configuration of the pipe, thereby preventing damage to the sleeve.
. ~ .
. . :
2-~' :
t2326 It is therefore an object of the present . invention to improve the function of corrugated drain pipe by providing, in combination therewith, an improved, tubular, knit sleeve.
It is a further object of the presellt illVellt:iOIl to provide a new and unique method of covering a corrugated drain pipe with a tubular knit sleeve tha-t is easier to install, remains in place, and provides more protection than those known heretofore.
These objects are attained by the inventive method of preventing the pipe and its openings in selected valleys from becoming clogged with gravel, rock, mud, dirt and the like in the subsurface drainage of water from land wherein corrugated drainage pipe having alternating peaks and valleys and a plurality of openings in selected valleys arranged along the long-itudinal axis of the pipe is buried beneath the surface of the ground. That method comprises providing a length of the corrugated drainage pipe having a desired maximum diameter, providing a length of tubular knit - fabric corresponding in length with the length of the `~ :
pipe and having a maximum diameter in the relaxed condition less than the desired maximum diameter of the pipe, installing the tubular knit fabric on the pipe, ~' ' '~ ~' : .
, , .
:` :
.
`, .
.- : , . ,. - , . . .
~0~2326 and permitting the tubular knit fabric to relax into . snug, tight engagement wi-th the peaks of the pipe with intervening undula-tions of the tubular knit fabric extending inwardly toward the axis of the pipe in correspondence with the location of the openings as the tubular knit fabric spans the valleys of the pipe.
BRIEF DESCRIPTION OF THE DR}~WINGS
. : . .
Figure 1 is an elevation view, partly in section, with portions broken away illustrating a length of drain pipe with the sleeve mounted thereon . in accordance with the present invention, and . Figure 2 is a sectional view taken substantially along lines 2-2 in Figure 1.
-,, ~, i DESCRIPTION OF THE PREFERRED :`
EMBODIMENT
Turning now to -the drawingsj the invention ~: ~
. here involved is gènerally directed to an improved : ~.
method of covering a corrugated, flexible drainage ~:
:I pipe 12 of the type having alternating annular peaks 14 and valleys 16 and a plurality of slotted openings ~ ~ :
18 arranged at spaced points and extending arcuately around portions of the wall in directions transverse to ~: the longitudinal axis of the pipe 12. A sleeve 10 ~ . .
,f , ~ , i ~i i ,', , ,1 . , , :
~ -4-., ~
:
., ~
~, .~ . . ,. - .
~ , ' , : , , ` ~
~)9~'32~i ~ ' ' s : ' ~ .
,.
comprises a continuous len~th of relatively elastic knit fabric which is tubular in shape and, in the relaxed condition, of a diameter less -than the cliameter of the corrugated drainage pipe 12, whereby when placed : 5 on pipe 12 the fabric is stretched to fit snugly therearound. The snug, stretched inlleren-tl~ elastic tubular sleeve is both easier to install and resists damage or dislodgement.
The sleeve 10 itself is formed of any suitable ~- 10 strand material on a circular knitting machine and is knit to form a continuous cylindrical tube in lengths oE up to 1,000 feet, lengths of 250 to 300 feet being preferred for practicality as bclny substantially coextensive with the lengths of corrugated ~flexible drainage pipe. A conventional non-run stitch '~
formation is used in the knitting oPeration, so that if a portion of the tube becomes torn during transportation or dragging along the ground the fabric will not run. By using a continuous tubular construction, it is not necessary to provide seams which would make sizing and installation difficult, or to wrap the fabric around the tube which would not be satisfact'ory because of the dislodgement Problem when dragging the pipe sections along the ground. ~ -., : . .
,.i ' . ! 5 . ', .
, :: ' ., .
$, . - . . ` . . - .. - .. ...... . . . . . . . . . . . -~1:)92326 The diameter oE the tubular fabric is so designed that in the relaxed condition the sleeve diameter is less than the maximum diameter o~ the tube ~or which the fabric is to be used. This provides a snug fit and prevents longitudinal displacement of the fabric once it is in place as well as t~istillg or wrapping around the tube. When installed, the tubular -~
knit fabric 10 relaxes into snug tight engagement ~ with the peaks 14 of tube 12 and undulates inwardly ; 10 toward the axis of the tube as at 20 as it spans the ~ ;
valleys 16. The undulations 20 correspond wlth the location of the slotted openings 18.
~; The corrugated tube 12 is preferably fabricated ~` of a darable, high strength polyethylene although other materials are suitable. Extruding techniques ` ~ are used~to shape the tublng by forcing the~molten ~`~
plastic through an annular orifice, as is well known.
The formed plastic tube is then reshaped to form the corrugations 14, 16 and transverse slotted openings 18.
'~ 20 ~ The improved sleeve 10 described hereinabove covers those slotted openings and actually provides a ~l fllter so that gravel, rock, mud, dirt and the like `i cannot clog the openings l8 which would result in a i less e~ficient drainage, or if the condition became .
bad enough, no drainage at all. The sleeve may be factory installed with assurance that transpoltatioll, ' ' :, ., ~ , :
~ -6- ~ ~
, , , r"
I J ~
. :
"
~9~3Z~
assembly and installation in the field will not damage or dislodge the sleeve. The improvement to the sleeve make i-t more permanent and easier to install, as well as being more durable during transportation and storage.
Although a preferred embodiment of the invention has been shown and described, it is apparent that changes and modifications could be made withou-t departing from - the scope and spirit of the invention which is set forth in the appended claims. `~
,` ' ' ' ~.::
'`' ' ' " ' " "
i '~ ' . ' ~.
"`t` , '~ ~' ,, , ' ; ' '', ' ' ' ' ~' ~'1 ', ' ' .
t2326 It is therefore an object of the present . invention to improve the function of corrugated drain pipe by providing, in combination therewith, an improved, tubular, knit sleeve.
It is a further object of the presellt illVellt:iOIl to provide a new and unique method of covering a corrugated drain pipe with a tubular knit sleeve tha-t is easier to install, remains in place, and provides more protection than those known heretofore.
These objects are attained by the inventive method of preventing the pipe and its openings in selected valleys from becoming clogged with gravel, rock, mud, dirt and the like in the subsurface drainage of water from land wherein corrugated drainage pipe having alternating peaks and valleys and a plurality of openings in selected valleys arranged along the long-itudinal axis of the pipe is buried beneath the surface of the ground. That method comprises providing a length of the corrugated drainage pipe having a desired maximum diameter, providing a length of tubular knit - fabric corresponding in length with the length of the `~ :
pipe and having a maximum diameter in the relaxed condition less than the desired maximum diameter of the pipe, installing the tubular knit fabric on the pipe, ~' ' '~ ~' : .
, , .
:` :
.
`, .
.- : , . ,. - , . . .
~0~2326 and permitting the tubular knit fabric to relax into . snug, tight engagement wi-th the peaks of the pipe with intervening undula-tions of the tubular knit fabric extending inwardly toward the axis of the pipe in correspondence with the location of the openings as the tubular knit fabric spans the valleys of the pipe.
BRIEF DESCRIPTION OF THE DR}~WINGS
. : . .
Figure 1 is an elevation view, partly in section, with portions broken away illustrating a length of drain pipe with the sleeve mounted thereon . in accordance with the present invention, and . Figure 2 is a sectional view taken substantially along lines 2-2 in Figure 1.
-,, ~, i DESCRIPTION OF THE PREFERRED :`
EMBODIMENT
Turning now to -the drawingsj the invention ~: ~
. here involved is gènerally directed to an improved : ~.
method of covering a corrugated, flexible drainage ~:
:I pipe 12 of the type having alternating annular peaks 14 and valleys 16 and a plurality of slotted openings ~ ~ :
18 arranged at spaced points and extending arcuately around portions of the wall in directions transverse to ~: the longitudinal axis of the pipe 12. A sleeve 10 ~ . .
,f , ~ , i ~i i ,', , ,1 . , , :
~ -4-., ~
:
., ~
~, .~ . . ,. - .
~ , ' , : , , ` ~
~)9~'32~i ~ ' ' s : ' ~ .
,.
comprises a continuous len~th of relatively elastic knit fabric which is tubular in shape and, in the relaxed condition, of a diameter less -than the cliameter of the corrugated drainage pipe 12, whereby when placed : 5 on pipe 12 the fabric is stretched to fit snugly therearound. The snug, stretched inlleren-tl~ elastic tubular sleeve is both easier to install and resists damage or dislodgement.
The sleeve 10 itself is formed of any suitable ~- 10 strand material on a circular knitting machine and is knit to form a continuous cylindrical tube in lengths oE up to 1,000 feet, lengths of 250 to 300 feet being preferred for practicality as bclny substantially coextensive with the lengths of corrugated ~flexible drainage pipe. A conventional non-run stitch '~
formation is used in the knitting oPeration, so that if a portion of the tube becomes torn during transportation or dragging along the ground the fabric will not run. By using a continuous tubular construction, it is not necessary to provide seams which would make sizing and installation difficult, or to wrap the fabric around the tube which would not be satisfact'ory because of the dislodgement Problem when dragging the pipe sections along the ground. ~ -., : . .
,.i ' . ! 5 . ', .
, :: ' ., .
$, . - . . ` . . - .. - .. ...... . . . . . . . . . . . -~1:)92326 The diameter oE the tubular fabric is so designed that in the relaxed condition the sleeve diameter is less than the maximum diameter o~ the tube ~or which the fabric is to be used. This provides a snug fit and prevents longitudinal displacement of the fabric once it is in place as well as t~istillg or wrapping around the tube. When installed, the tubular -~
knit fabric 10 relaxes into snug tight engagement ~ with the peaks 14 of tube 12 and undulates inwardly ; 10 toward the axis of the tube as at 20 as it spans the ~ ;
valleys 16. The undulations 20 correspond wlth the location of the slotted openings 18.
~; The corrugated tube 12 is preferably fabricated ~` of a darable, high strength polyethylene although other materials are suitable. Extruding techniques ` ~ are used~to shape the tublng by forcing the~molten ~`~
plastic through an annular orifice, as is well known.
The formed plastic tube is then reshaped to form the corrugations 14, 16 and transverse slotted openings 18.
'~ 20 ~ The improved sleeve 10 described hereinabove covers those slotted openings and actually provides a ~l fllter so that gravel, rock, mud, dirt and the like `i cannot clog the openings l8 which would result in a i less e~ficient drainage, or if the condition became .
bad enough, no drainage at all. The sleeve may be factory installed with assurance that transpoltatioll, ' ' :, ., ~ , :
~ -6- ~ ~
, , , r"
I J ~
. :
"
~9~3Z~
assembly and installation in the field will not damage or dislodge the sleeve. The improvement to the sleeve make i-t more permanent and easier to install, as well as being more durable during transportation and storage.
Although a preferred embodiment of the invention has been shown and described, it is apparent that changes and modifications could be made withou-t departing from - the scope and spirit of the invention which is set forth in the appended claims. `~
,` ' ' ' ~.::
'`' ' ' " ' " "
i '~ ' . ' ~.
"`t` , '~ ~' ,, , ' ; ' '', ' ' ' ' ~' ~'1 ', ' ' .
Claims (2)
1. In the subsurface drainage of water from land wherein corrugated drainage pipe having alternating peaks and valleys and a plurality of openings in selected valleys arranged along the longitudinal axis of the pipe is buried beneath the surface of the ground, the method of preventing the pipe and its openings in selected valleys from becoming clogged with gravel, rock, mud, dirt and the like which comprises providing a length of said corrugated drainage pipe having a desired maximum diameter, providing a length of tubular knit fabric corresponding in length with the length of said pipe and having a maximum diameter in the relaxed condition less than said desired maximum diameter of the pipe, installing said tubular knit fabric on said pipe, and permitting the tubular knit fabric to relax into snug, tight engagement with the peaks of the pipe with intervening undulations of the tubular knit fabric extending inwardly toward the axis of the pipe in correspondence with the location of said openings as the tubular knit fabric spans the valleys of the pipe.
2. A method according to Claim 1 wherein the tubular knit fabric is of non-run construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA330,261A CA1092326A (en) | 1979-06-21 | 1979-06-21 | Method of covering corrugated drainage tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA330,261A CA1092326A (en) | 1979-06-21 | 1979-06-21 | Method of covering corrugated drainage tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1092326A true CA1092326A (en) | 1980-12-30 |
Family
ID=4114516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA330,261A Expired CA1092326A (en) | 1979-06-21 | 1979-06-21 | Method of covering corrugated drainage tubes |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1092326A (en) |
-
1979
- 1979-06-21 CA CA330,261A patent/CA1092326A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |