CA2199025A1 - Connecting collar for pipes - Google Patents
Connecting collar for pipesInfo
- Publication number
- CA2199025A1 CA2199025A1 CA002199025A CA2199025A CA2199025A1 CA 2199025 A1 CA2199025 A1 CA 2199025A1 CA 002199025 A CA002199025 A CA 002199025A CA 2199025 A CA2199025 A CA 2199025A CA 2199025 A1 CA2199025 A1 CA 2199025A1
- Authority
- CA
- Canada
- Prior art keywords
- collar
- pipe
- compression section
- section
- compression
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/002—Sleeves or nipples for pipes of the same diameter; Reduction pieces
Abstract
A collar for engagement with one or more pipes, comprising an intermediate internally extending circumferential projection (2) dividing the collar (1) into two internal portions (4) wherein at least one of the portions has a compression section (3) adjacent to the internally extending circumferential projection (2) for the compressive engagement of a pipe, and a lead section (6) for guiding said pipe into said compression section (3). In a further example of the collar (35), one portion (37) is an integral length of conduit adapted for the joining of pipes to manholes (42).
Description
21 9~0~5 TITLE
C~ Collar for Pipes FIELD OF INVENTION
This invention relates to a collar for use in a pipe system and ; a method for the joining of pipes. The invention is particularly useful for large dlameter concrete pipes such as those used for sewerage and the handling and drainage of storm water BACKGROUND ART
The joining of large diameter concrete pipes for sewerage and 10 storm water drainage is associated with various problems. In particular, it IS dlfficuit to maintain joint integnty and to effect a water resistant seal where plpes are flush jolnted Common methods of Joinlng concrete pipes presently in use involves splgot and socket rubber ring joints for all storm water pipes up to 15 600 mm diameter. Larger diameter pipes are generally flush jointed.
Flush joining of pipes involves the laying of pipe segments by abutting them end to end and providing a circumferential seal around each individual join. Flush joins are either of the internal or external flush type in which the gap in the join is filled with mortar rendering and sometimes with the addition of an external band that slows the ingress of water and prevents most fines from Infiltratlng the joint but does not resist the egress of water Any misalignment due to bad laying practice, ground movement or other causes of misalignment commonly results in the 2:, failure of the function of the joint.
Water resistance of joints in pipes is desirable from several points of view One problem Is associated with the leakage of underground water into sewerage and storm water drainage systems which results in a reduction of the effectiveness of the sewerage and 30 waste water plants respectively. Furthermore, ingress of bedding or soil material from around large pipes may result in ground collapse such as under roads and pavements.
2 1 9 9 0 2 5 PCrIAU 9 5 / ~ 0 5 4 3 Leakage of sewerage or waste water into the surrounding area due to a joint failure is also undesirable from a health and environmental perspective. Leaking of water and highly nutrient matter encourages opportunistic plant root growth which often results in 5 extensive and expensive blockages of the system.
In some cases, leakage of liquid into the surrounding soil especially where high internal pressure is involved may result in undermining building foundations and/or the cracking of pavements due to the hydroscopic swelling of clay soils.
Flush joint pipelines have, for many years, been constructed by laying spigot and socket "Flush Joint" pipes and rendering the resulting joint internally or externally with sand and cement mortar.
In recent years an elastomeric wrapping or "Sand Band" has been applied to attempt to alleviate the joint failure occurring as a result of differential movement of the pipes in the pipeline, and the subsequent displacement and disintegration of the relatively brittle cement rendering.
Both of the aforementioned methods of jointing are considered to be ineffficient, liable to error in application, and make verification of joint integrity difficult.
2 o There is also a requirement for the joining of pipes to structures such as manhole or gutter box facilities.
In these applications, the usual method employed is to construct the manhole or gutter box around the end of the pipe.
Similar problems as previously mentioned with the flush joining of pipes are also encountered e.g. poor laying practice and ground movement which often results in !eakage and the~ cracking of the joints and/or the pipes themselves.
OBJECT OF THE INVENTION
It is an object of the invention to overcome or alleviate at least one of the problems associated with prior art joining of a pipe or pipes to a collar.
IPEA/Au 21 99025 PCI'~AU 9 5 / o o s 4 3 ~?E~IVED 1 7 SEP t996 DISCLOSURE OF THE INVENTION
According to one aspect of the invention there is provided a collar for engagement with at least one pipe, said collar comprising:
an intermediate, internally extending, circumferential projection dividing said collar into two internal portions;
at least one of said portions having a compression section adjacent to said internally extending circumferential projection for the compressive engagement of said at least one pipe; and a lead section for guiding said at least one pipe into said compression section;
wherein said compression section contacts the pipe to effect a substantially leak-proof seal between the pipe and the collar.
Preferably, the- internally extending circumferential projection is a flexible hinge adapted to allow relative movement between said two 1 5 portions.
Suitably, the flexible hinge is integrally formed in the collar.
Preferably, the flexible hinge forms a channel in an outer surface of the collar.
There may be a rubberised ring in the channel.
Suitably, said compression section is divided into at least two regions having internal surfaces of different gradients with respect to a longitudinal axis of a collar.
Preferably, both the gradients slope to continuously decrease the internal diameter of said compression section as it extends from the lead section towards the inwardly extending circumferential projection.
The said gradients may suitably slope in opposite directions.
Suitably, the said regions meet at a regulation point having an internal diameter which is less than the minimum internal diameter of either one of the said regions.
There may be an outwardly tapering lead section adapted to flex relative to the compression section. Suitably, there may be a IPEA/AU
'`~ ? IJ~;,3 3/l weakened portion between the lead section and the compression section to allow flexing therebetween.
Preferably, one of said two portions is an integral length of conduit.
Suitably, the collar is integrally formed from a resilient material.
2 1 9 9 0 2 5 PCr/AU 9 5 / O 0 5 4 3 There may be an elastomeric lining on the inner surface of the compression section.
Preferably, there are a plurality of radial strengthening webs along a length of an external surface of said collar.
Suitably, the webs extend between an outer surface of an edge portion of a lead section to an outer surface of said compression section.
According to another aspect of the invention there is provided a method for joining pipes including the steps of:
0 sliding an end of a first pipe into a first compression section of a collar until said end of said first pipe abuts an intermediate, internally extending, circumferential projection of the collar adjacent the first compression section; and sliding an end of a second pipe into a second compression section adjacent the intermediate, internally extending, circumferential projection until said end of said second pipe abuts the intermediate, internally extending, circumferential projection;
wherein said compression sections effect compressive engagement to provide a substantially leak-proof seal between the collar 2 o and respective ends of the first and second pipes.
Preferably, the method may be further characterised by the internally extending circumferential projection being a flexible hinge adapted to allow relative movement between the compression sections.
BRIEF DESCRIPTION OF THE DR,AWINGS
In order that the invention may be readily understood and put into practical effect, reference will now be made to preferred embodiments in which:
Fig 1 is a cross sectional profile of a collar according to a first embodiment of the invention, Fig 2 is a cross sectional profile of a collar according to a second embodiment of the invention, 2 1 9 9 0 2 5 ~ J ~ ,-J
RE~EIVEO ~ 7 SEP 1996 Fig 3 is a cross sectional profile of a collar according to a third embodiment of the invention, Fig 4 shows a cross section of the collar of FIG 1 joining two flush jointed pipes, ... .
4M~:fVDED SHEET
IPE~UAU
WO 96/07047 PCT/AU9~/00543 Fig 5 is a perspective view of collar according to a fourth embodiment of the invention adapted for the joining of flush jointed pipes to gutter boxes or manholes, and Fig 6 shows the cPllar of Fig 5 joined to a gutter box.
DETAI~ED DESCRIPTION OF THE DRAWINGS
In Fig 1 there is shown a cross sectional profile of an annular collar 1 having an integral flexible hinge 2 forming a channel 5 in an outer surface of collar 1 Collar 1 is formed from any suitable resilient material and flexible hinge 2 forms an intermediate internally extending portion in collar 1 and divldes collar 1 into two portions 4. Each one of portions 4 has a compression sectlon 3 and an outwardly tapering lead section 6 for guldlng a plpe Into compression section 3. On the internal surface of compression section 3 there is an elastomeric lining 3c which is deformable to provide a seal between an inserted pipe and compression 1 5 section 3.
Section 3 is divided into a frictional grip region 3a and a compression region 3b having internal surfaces of different gradients.
The gradient X1 of the friction grip region 3a as determined from a longitudinal axis 6a of collar 1 is steeper than the gradient Y1 of 2() compresslon region 3b This ensures a progressively increasing radial force around a plpe (not shown) as it is inserted into the collar 1.
On an external surface of collar 1 there is a plurality of radial strengthening webs 4a. each of which extends along a length of collar 1 from an edge portion of a respective lead section 6 to an outer surface of 2:, a respective compression section 3.
It will be apparent to a skilled addressee that the compression sectlon 3 may be divided into a greater number of regions in addition to regions 3a and 3b. For example the compression section 3 may divide into numerous regions which effectively result in a curved section between the lead section 6 and the flexible hinge 2.
In Fig 2 there is shown a cross sectional profile of an annular collar 7 having an integral flexible hinge 8, forming a cannel 11 in an outer surface of collar 7. Flexible hinge 8 forms an intermediate internally extending portion in collar 7 and divides collar 7 into two portions 10.
Each one of portions 10 has a compression section 9 and a lead section 12 for gulding a pipe into compression section 9. Further, on an outer surface of collar 7 there are radial strengthening ribs 10a.
Section 9 is divided into a frictional grip region 9a and a compression region 9b having internal surfaces of different gradients.
The gradient X2 relative to longitudinal axis 7a of the frictional grip region 9a slopes upwardly from the base of the flexible hinge 8 to form z crest or regulatlon polnt 13 with the compression region 9b. The gradient Y. relatlve to longitudinal axis 7a of the region 9b slopes in the opposite dlrectlon to the gradlent of the region 9a. Lead section 12 is adjacent region 9b to facilitate the location and insertion of a pipe.
As the internal diameter of the regulation point 13 is less than the minimum internal diameter of either regions 9a or 9b, the insertion of a pipe causes region 9a to flatten out to firmly engage the pipe with an increased radial force In Fig 3 there IS shown a cross sectional profile of an annular collar 13 having a flexible hinge 14 forming a channel 17 in an outer surface of collar 13. Flexible hinge 14 forms an intermediate internally extending portion in collar 13 and divides collar 13 with two portions 16.
Each one of portion 16 has a compression section 15 and a lead section 18 for guiding a pipe into compression section 15.
Sectlon 15 is divlded into a fictional grip region 15a and a 2~-, compression region 15b havlng Internal surfaces of different gradients.
The gradient X3 of the friction grip region 15a as determined from a longltudinal axis 19 of collar 13 is steeper than the gradient Y3 of compression reglon 15b and ensures a progressively increasing radial force around a pipe when inserted into the collar 13.
A rubberised ring 17a shown in cross section is fitted inside channel 17 to act as a shock absorber during the insertion of a pipe.
The reglon 1 5b is of a thicker cross sectional area than region 1 5a thereby relnforcing compression region 1 5b.
Lead sectlon 18 is flexibly associated with region 15b by a reduced cross sectional at area thereby providing a weakened portion 18a.
:, In addition, as the second region 1 Sb is reinforced, any deflection of the lead section 18 by surrounding material such as stones or rocks should not cause a disruption to a seal effected between the compresslon sectlon 15 and a pipe.
In Fig 4 it can be seen that two flush jointed pipes 20 and 21 0 are joined by collar 1. The flexible hinge 2 resides in groove 24 formed by a shoulder of an annular spigot 25 of pipe 20 and an edge face of a socket 26 of pipe 21 Although not shown in the illustration, it will be apparent to a skilled address see that any misalignment of the pipes 20 and 21 will -) cause a portion of flexible hinge 2 to expand with a contraction of a dlametncally oppos!te portlon of hlnge 2. This therefore allows for misalignment of pipes due to either bad laying practice or ground movement in which damage to the seal is reduced or avoided.
In use. Iead section 6 facilitates guiding respective pipes 20 and 21 into collar 1 Ideally. sealant 31 is applied adjacent ends of pipes 20 and 21 which are to be inserted into collar 1.
Accordingly, pipe 20 is guided into collar 1, by lead portion 6 after which pipe 20 engages compression region 3b and frictional grip region 3a. Frictional grip region 3a grips pipe 20 and compression region 3b provides a seal with sealant 31 Similarly, pipe 21 engages the opposite portion of collar 1 in which region 3a grip pipe 21 and region 3b from a seal with sealant 31.
In Fig 5 there IS shown an example of a collar 35 specially adapted for the !olnlng of flush Jointed pipes to gutter boxes or man hole facillties It can be seen that one portion of collar 35 comprises an outwardly tapering lead section 36 and a compression section 36a ending at a flexible hinge 36b. The other portion of collar 35 is comprised of a conduit 37 covered with a raised pattern 38 on an outer surface to facilltate the formation of a seal with concrete walls of a gutter box to which it is joined.
In Fig 6 there is shown collar 35 as in FIG 5 joined to a gutter , box 42 In this illustrallon the cylindrical conduit of the collar 35 is perpendicula~- lo the gutter box 42 although it will be obvious to the skilled addressee that the condult 37 may be cut at any angle and joined to the gutter box 42 from any dlrection In use for example. collar 7 may be used for joining two pipes 0 in which one of the pipes has a sealant applied to one end. The pipe is Inserted into collar 7 and is guided by lead section 1Z into compression section 9 The plpe slides into both region 9a and 9b until it abuts flexible hinge 8 In a similar fashion the sealant is applied to an end of the other one of the plpes after which it IS slid into the opposite compression 1:, sectlon 9 until it abuts flexible hinge 8.
It will be readily apparent to a skilled addressee that many modiflcations and ~Jariations may be made to the invention without departing frorn the scope thereof For example. the liquid or other sealant used to forrn a water tlght seal between the collar and a pipe may also be 2() a lubncant to facllitate easier insertion of the pipe.
In additlon, the sealant may also be a chemical bonding agent between the material of the collar and the pipe, such that any imperfections in the finish of the outside of the pipe are accommodated with a relatively permanent seal achieved.
2 ,
C~ Collar for Pipes FIELD OF INVENTION
This invention relates to a collar for use in a pipe system and ; a method for the joining of pipes. The invention is particularly useful for large dlameter concrete pipes such as those used for sewerage and the handling and drainage of storm water BACKGROUND ART
The joining of large diameter concrete pipes for sewerage and 10 storm water drainage is associated with various problems. In particular, it IS dlfficuit to maintain joint integnty and to effect a water resistant seal where plpes are flush jolnted Common methods of Joinlng concrete pipes presently in use involves splgot and socket rubber ring joints for all storm water pipes up to 15 600 mm diameter. Larger diameter pipes are generally flush jointed.
Flush joining of pipes involves the laying of pipe segments by abutting them end to end and providing a circumferential seal around each individual join. Flush joins are either of the internal or external flush type in which the gap in the join is filled with mortar rendering and sometimes with the addition of an external band that slows the ingress of water and prevents most fines from Infiltratlng the joint but does not resist the egress of water Any misalignment due to bad laying practice, ground movement or other causes of misalignment commonly results in the 2:, failure of the function of the joint.
Water resistance of joints in pipes is desirable from several points of view One problem Is associated with the leakage of underground water into sewerage and storm water drainage systems which results in a reduction of the effectiveness of the sewerage and 30 waste water plants respectively. Furthermore, ingress of bedding or soil material from around large pipes may result in ground collapse such as under roads and pavements.
2 1 9 9 0 2 5 PCrIAU 9 5 / ~ 0 5 4 3 Leakage of sewerage or waste water into the surrounding area due to a joint failure is also undesirable from a health and environmental perspective. Leaking of water and highly nutrient matter encourages opportunistic plant root growth which often results in 5 extensive and expensive blockages of the system.
In some cases, leakage of liquid into the surrounding soil especially where high internal pressure is involved may result in undermining building foundations and/or the cracking of pavements due to the hydroscopic swelling of clay soils.
Flush joint pipelines have, for many years, been constructed by laying spigot and socket "Flush Joint" pipes and rendering the resulting joint internally or externally with sand and cement mortar.
In recent years an elastomeric wrapping or "Sand Band" has been applied to attempt to alleviate the joint failure occurring as a result of differential movement of the pipes in the pipeline, and the subsequent displacement and disintegration of the relatively brittle cement rendering.
Both of the aforementioned methods of jointing are considered to be ineffficient, liable to error in application, and make verification of joint integrity difficult.
2 o There is also a requirement for the joining of pipes to structures such as manhole or gutter box facilities.
In these applications, the usual method employed is to construct the manhole or gutter box around the end of the pipe.
Similar problems as previously mentioned with the flush joining of pipes are also encountered e.g. poor laying practice and ground movement which often results in !eakage and the~ cracking of the joints and/or the pipes themselves.
OBJECT OF THE INVENTION
It is an object of the invention to overcome or alleviate at least one of the problems associated with prior art joining of a pipe or pipes to a collar.
IPEA/Au 21 99025 PCI'~AU 9 5 / o o s 4 3 ~?E~IVED 1 7 SEP t996 DISCLOSURE OF THE INVENTION
According to one aspect of the invention there is provided a collar for engagement with at least one pipe, said collar comprising:
an intermediate, internally extending, circumferential projection dividing said collar into two internal portions;
at least one of said portions having a compression section adjacent to said internally extending circumferential projection for the compressive engagement of said at least one pipe; and a lead section for guiding said at least one pipe into said compression section;
wherein said compression section contacts the pipe to effect a substantially leak-proof seal between the pipe and the collar.
Preferably, the- internally extending circumferential projection is a flexible hinge adapted to allow relative movement between said two 1 5 portions.
Suitably, the flexible hinge is integrally formed in the collar.
Preferably, the flexible hinge forms a channel in an outer surface of the collar.
There may be a rubberised ring in the channel.
Suitably, said compression section is divided into at least two regions having internal surfaces of different gradients with respect to a longitudinal axis of a collar.
Preferably, both the gradients slope to continuously decrease the internal diameter of said compression section as it extends from the lead section towards the inwardly extending circumferential projection.
The said gradients may suitably slope in opposite directions.
Suitably, the said regions meet at a regulation point having an internal diameter which is less than the minimum internal diameter of either one of the said regions.
There may be an outwardly tapering lead section adapted to flex relative to the compression section. Suitably, there may be a IPEA/AU
'`~ ? IJ~;,3 3/l weakened portion between the lead section and the compression section to allow flexing therebetween.
Preferably, one of said two portions is an integral length of conduit.
Suitably, the collar is integrally formed from a resilient material.
2 1 9 9 0 2 5 PCr/AU 9 5 / O 0 5 4 3 There may be an elastomeric lining on the inner surface of the compression section.
Preferably, there are a plurality of radial strengthening webs along a length of an external surface of said collar.
Suitably, the webs extend between an outer surface of an edge portion of a lead section to an outer surface of said compression section.
According to another aspect of the invention there is provided a method for joining pipes including the steps of:
0 sliding an end of a first pipe into a first compression section of a collar until said end of said first pipe abuts an intermediate, internally extending, circumferential projection of the collar adjacent the first compression section; and sliding an end of a second pipe into a second compression section adjacent the intermediate, internally extending, circumferential projection until said end of said second pipe abuts the intermediate, internally extending, circumferential projection;
wherein said compression sections effect compressive engagement to provide a substantially leak-proof seal between the collar 2 o and respective ends of the first and second pipes.
Preferably, the method may be further characterised by the internally extending circumferential projection being a flexible hinge adapted to allow relative movement between the compression sections.
BRIEF DESCRIPTION OF THE DR,AWINGS
In order that the invention may be readily understood and put into practical effect, reference will now be made to preferred embodiments in which:
Fig 1 is a cross sectional profile of a collar according to a first embodiment of the invention, Fig 2 is a cross sectional profile of a collar according to a second embodiment of the invention, 2 1 9 9 0 2 5 ~ J ~ ,-J
RE~EIVEO ~ 7 SEP 1996 Fig 3 is a cross sectional profile of a collar according to a third embodiment of the invention, Fig 4 shows a cross section of the collar of FIG 1 joining two flush jointed pipes, ... .
4M~:fVDED SHEET
IPE~UAU
WO 96/07047 PCT/AU9~/00543 Fig 5 is a perspective view of collar according to a fourth embodiment of the invention adapted for the joining of flush jointed pipes to gutter boxes or manholes, and Fig 6 shows the cPllar of Fig 5 joined to a gutter box.
DETAI~ED DESCRIPTION OF THE DRAWINGS
In Fig 1 there is shown a cross sectional profile of an annular collar 1 having an integral flexible hinge 2 forming a channel 5 in an outer surface of collar 1 Collar 1 is formed from any suitable resilient material and flexible hinge 2 forms an intermediate internally extending portion in collar 1 and divldes collar 1 into two portions 4. Each one of portions 4 has a compression sectlon 3 and an outwardly tapering lead section 6 for guldlng a plpe Into compression section 3. On the internal surface of compression section 3 there is an elastomeric lining 3c which is deformable to provide a seal between an inserted pipe and compression 1 5 section 3.
Section 3 is divided into a frictional grip region 3a and a compression region 3b having internal surfaces of different gradients.
The gradient X1 of the friction grip region 3a as determined from a longitudinal axis 6a of collar 1 is steeper than the gradient Y1 of 2() compresslon region 3b This ensures a progressively increasing radial force around a plpe (not shown) as it is inserted into the collar 1.
On an external surface of collar 1 there is a plurality of radial strengthening webs 4a. each of which extends along a length of collar 1 from an edge portion of a respective lead section 6 to an outer surface of 2:, a respective compression section 3.
It will be apparent to a skilled addressee that the compression sectlon 3 may be divided into a greater number of regions in addition to regions 3a and 3b. For example the compression section 3 may divide into numerous regions which effectively result in a curved section between the lead section 6 and the flexible hinge 2.
In Fig 2 there is shown a cross sectional profile of an annular collar 7 having an integral flexible hinge 8, forming a cannel 11 in an outer surface of collar 7. Flexible hinge 8 forms an intermediate internally extending portion in collar 7 and divides collar 7 into two portions 10.
Each one of portions 10 has a compression section 9 and a lead section 12 for gulding a pipe into compression section 9. Further, on an outer surface of collar 7 there are radial strengthening ribs 10a.
Section 9 is divided into a frictional grip region 9a and a compression region 9b having internal surfaces of different gradients.
The gradient X2 relative to longitudinal axis 7a of the frictional grip region 9a slopes upwardly from the base of the flexible hinge 8 to form z crest or regulatlon polnt 13 with the compression region 9b. The gradient Y. relatlve to longitudinal axis 7a of the region 9b slopes in the opposite dlrectlon to the gradlent of the region 9a. Lead section 12 is adjacent region 9b to facilitate the location and insertion of a pipe.
As the internal diameter of the regulation point 13 is less than the minimum internal diameter of either regions 9a or 9b, the insertion of a pipe causes region 9a to flatten out to firmly engage the pipe with an increased radial force In Fig 3 there IS shown a cross sectional profile of an annular collar 13 having a flexible hinge 14 forming a channel 17 in an outer surface of collar 13. Flexible hinge 14 forms an intermediate internally extending portion in collar 13 and divides collar 13 with two portions 16.
Each one of portion 16 has a compression section 15 and a lead section 18 for guiding a pipe into compression section 15.
Sectlon 15 is divlded into a fictional grip region 15a and a 2~-, compression region 15b havlng Internal surfaces of different gradients.
The gradient X3 of the friction grip region 15a as determined from a longltudinal axis 19 of collar 13 is steeper than the gradient Y3 of compression reglon 15b and ensures a progressively increasing radial force around a pipe when inserted into the collar 13.
A rubberised ring 17a shown in cross section is fitted inside channel 17 to act as a shock absorber during the insertion of a pipe.
The reglon 1 5b is of a thicker cross sectional area than region 1 5a thereby relnforcing compression region 1 5b.
Lead sectlon 18 is flexibly associated with region 15b by a reduced cross sectional at area thereby providing a weakened portion 18a.
:, In addition, as the second region 1 Sb is reinforced, any deflection of the lead section 18 by surrounding material such as stones or rocks should not cause a disruption to a seal effected between the compresslon sectlon 15 and a pipe.
In Fig 4 it can be seen that two flush jointed pipes 20 and 21 0 are joined by collar 1. The flexible hinge 2 resides in groove 24 formed by a shoulder of an annular spigot 25 of pipe 20 and an edge face of a socket 26 of pipe 21 Although not shown in the illustration, it will be apparent to a skilled address see that any misalignment of the pipes 20 and 21 will -) cause a portion of flexible hinge 2 to expand with a contraction of a dlametncally oppos!te portlon of hlnge 2. This therefore allows for misalignment of pipes due to either bad laying practice or ground movement in which damage to the seal is reduced or avoided.
In use. Iead section 6 facilitates guiding respective pipes 20 and 21 into collar 1 Ideally. sealant 31 is applied adjacent ends of pipes 20 and 21 which are to be inserted into collar 1.
Accordingly, pipe 20 is guided into collar 1, by lead portion 6 after which pipe 20 engages compression region 3b and frictional grip region 3a. Frictional grip region 3a grips pipe 20 and compression region 3b provides a seal with sealant 31 Similarly, pipe 21 engages the opposite portion of collar 1 in which region 3a grip pipe 21 and region 3b from a seal with sealant 31.
In Fig 5 there IS shown an example of a collar 35 specially adapted for the !olnlng of flush Jointed pipes to gutter boxes or man hole facillties It can be seen that one portion of collar 35 comprises an outwardly tapering lead section 36 and a compression section 36a ending at a flexible hinge 36b. The other portion of collar 35 is comprised of a conduit 37 covered with a raised pattern 38 on an outer surface to facilltate the formation of a seal with concrete walls of a gutter box to which it is joined.
In Fig 6 there is shown collar 35 as in FIG 5 joined to a gutter , box 42 In this illustrallon the cylindrical conduit of the collar 35 is perpendicula~- lo the gutter box 42 although it will be obvious to the skilled addressee that the condult 37 may be cut at any angle and joined to the gutter box 42 from any dlrection In use for example. collar 7 may be used for joining two pipes 0 in which one of the pipes has a sealant applied to one end. The pipe is Inserted into collar 7 and is guided by lead section 1Z into compression section 9 The plpe slides into both region 9a and 9b until it abuts flexible hinge 8 In a similar fashion the sealant is applied to an end of the other one of the plpes after which it IS slid into the opposite compression 1:, sectlon 9 until it abuts flexible hinge 8.
It will be readily apparent to a skilled addressee that many modiflcations and ~Jariations may be made to the invention without departing frorn the scope thereof For example. the liquid or other sealant used to forrn a water tlght seal between the collar and a pipe may also be 2() a lubncant to facllitate easier insertion of the pipe.
In additlon, the sealant may also be a chemical bonding agent between the material of the collar and the pipe, such that any imperfections in the finish of the outside of the pipe are accommodated with a relatively permanent seal achieved.
2 ,
Claims (20)
1. A collar for engagement with at least one pipe, said collar comprising:
an intermediate, internally extending, circumferential projection dividing said collar into two internal portions;
at least one of said portions having a compression section adjacent to said internally extending circumferential projection for the compressive engagement of said at least one pipe; and a lead section for guiding said at least one pipe into said compression section;
wherein said compression section contacts the pipe to effect a substantially leak-proof seal between the pipe and the collar.
an intermediate, internally extending, circumferential projection dividing said collar into two internal portions;
at least one of said portions having a compression section adjacent to said internally extending circumferential projection for the compressive engagement of said at least one pipe; and a lead section for guiding said at least one pipe into said compression section;
wherein said compression section contacts the pipe to effect a substantially leak-proof seal between the pipe and the collar.
2. A collar as claimed in claim 1 in which the internally extending circumferential projection is a flexible hinge adapted to allow relative movement between said two portions.
3. A collar as claimed in claim 2 in which the flexible hinge is integrally formed in the collar.
4. A collar as claimed in claim 2 wherein the flexible hinge forms a channel in an outer surface of the collar.
5. A collar as claimed in claim 2 further comprising a rubberised ring in a channel formed in an outer surface of the collar.
6. A collar as claimed in claim 1 wherein said compression section is divided into at least two regions having internal surfaces of different gradients with respect to a longitudinal axis of a collar.
7. A collar as claimed in claim 6 in which both the gradients slope to continuously decrease the internal diameter of said compression section as it extends from the lead section towards the inwardly extending circumferential projection.
8. A collar as claimed in claim 6 wherein said gradients slope in opposite directions.
9. A collar as claimed in claim 1 wherein said compression section is divided into at least two regions having internal surfaces of different gradients with respect to a longitudinal axis of the collar and wherein said regions meet at a regulation point defining an internal diameter less than the internal diameter of either one of said regions.
10. A collar as claimed in claim 1 wherein said lead section is outwardly tapering and adapted to flex relative to said compression section.
11. A collar as claimed in claim 10 having a weakened portion between said lead section and said compression section to allow flexing therebetween.
12. A collar as claimed in claim 1 wherein one of said two portions is an integral length of conduit.
13. A collar as claimed in claim 1 integrally formed from a resilient material.
14. A collar as claimed in claim 1 having an elastomeric lining on said inner surface of said compression section.
15. A collar as claimed in claim 1 wherein there are a plurality of radial strengthening webs along a length of an external surface of said collar.
16. A collar as claimed in claim 2 wherein there are a plurality of radial strengthening webs along a length of an external surface of said collar.
17. A collar as claimed in claim 16, wherein said webs extend between an outer surface of an edge portion of a lead section to an outer surface of said compression section.
18. A method for joining pipes including the steps of:
sliding an end of a first pipe into a first compression section of a collar until said end of said first pipe abuts an intermediate, internally extending, circumferential projection of the collar adjacent the first compression section; and sliding an end of a second pipe into a second compression section adjacent the intermediate, internally extending, circumferential projection until said end of said second pipe abuts the intermediate, internally extending, circumferential projection;
wherein said compression sections effect compressive engagement to provide a substantially leak-proof seal between the collar and respective ends of the first and second pipes.
sliding an end of a first pipe into a first compression section of a collar until said end of said first pipe abuts an intermediate, internally extending, circumferential projection of the collar adjacent the first compression section; and sliding an end of a second pipe into a second compression section adjacent the intermediate, internally extending, circumferential projection until said end of said second pipe abuts the intermediate, internally extending, circumferential projection;
wherein said compression sections effect compressive engagement to provide a substantially leak-proof seal between the collar and respective ends of the first and second pipes.
19. The method of claim 18, wherein the internally extending, circumferential projection is a flexible hinge adapted to allow relative movement between the compression sections.
20. The method of claim 18 further including the step of applying a sealant to said end of said first pipe and said end of said second pipe prior to sliding the respective ends into the collar.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPM7786A AUPM778694A0 (en) | 1994-09-01 | 1994-09-01 | Clip-on-flexable collar |
| AUPM7786 | 1994-09-01 | ||
| AUPN3775 | 1995-06-26 | ||
| AUPN3775A AUPN377595A0 (en) | 1995-06-26 | 1995-06-26 | Clip on collar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2199025A1 true CA2199025A1 (en) | 1996-03-07 |
Family
ID=25644754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002199025A Abandoned CA2199025A1 (en) | 1994-09-01 | 1995-08-28 | Connecting collar for pipes |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2199025A1 (en) |
| WO (1) | WO1996007047A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2478058B (en) * | 2010-02-18 | 2015-06-03 | Flex Seal Couplings Ltd | Improvements in pipe coupling bushes |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB953687A (en) * | 1962-11-01 | 1964-03-25 | Hepworth Iron Co Ltd | Improvements in or relating to pipe couplings |
| GB1250609A (en) * | 1968-01-18 | 1971-10-20 | ||
| DE1921956A1 (en) * | 1969-04-30 | 1970-11-19 | Muecher Hermann | Sealing of pipe joints |
| US4126339A (en) * | 1977-11-21 | 1978-11-21 | W. S. Dickey Clay Mfg. Co. | Plain end pipe fitting |
-
1995
- 1995-08-28 CA CA002199025A patent/CA2199025A1/en not_active Abandoned
- 1995-08-28 WO PCT/AU1995/000543 patent/WO1996007047A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO1996007047A1 (en) | 1996-03-07 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |