AU2013203982B2 - A winding machine and winding cage for a helically wound pipe - Google Patents

Abstract

A winding cage, for winding a helically wound pipe from an elongate ribbed strip having at least one rib and having opposed joinable edge portions, is disclosed. The winding cage includes: a plurality of spaced apart strip guide rollers, the strip guide rollers spaced around a longitudinal winding cage axis; a proximal support frame; a distal support frame having, the proximal and distal support frames spaced apart from each other and together supporting the plurality of spaced apart strip guide rollers; a f4 proximal frame bridge, the bridge extending away from the proximal frame and bridging between spaced apart first and second ends of the proximal support frame; and a proximal mount on the bridge and a distal mount on the distal support frame, the proximal and distal mounts for receiving a strip driver assembly, the strip driver assembly for driving the strip into the winding cage. The bridge forms part of a mouth opening into the winding cage. The mouth is for accommodating the strip driver assembly.

Description

WO 2013/138869 PCT/AU2013/000301 A WINDING MACHINE AND WINDING CAGE FOR A HELICALLY WOUND PIPE PRIORITY DOCUMENTS [00011 The present application claims priority from: Australian Provisional Patent Application No. 2012901162 titled "A WINDING MACHINE AND WINDING CAGE FOR A HELICALLY WOUND PIPE" and filed on 22 March 2012; and Australian Provisional Patent Application No. 2012901163 titled "A WINDING MACHINE AND WINDING CAGE FOR A HELICALLY WOUND PIPE" and filed on 22 March 2012. The content of each of these applications is hereby incorporated by reference in their entirety. TECHNICAL FIELD 100021 The invention relates to an apparatus for lining pipes or conduits with a helically wound pipe. The invention relates in particular to a winding machine for relining a conduit where the pipe is wound within the conduit. BACKGROUND [00031 The applicant has developed various technologies to allow trenchless pipe rehabilitation. The applicant's International Patent Application No. PCT/AU87/00069 titled "Method and Means for Lining. and Overwrapping Conduits" described a method and means of lining conduits, pipes or tunnels. The method described in that patent included helically winding a strip into a pipe and holding the pipe at a selected diameter during placement within the pipe to be rehabilitated. The method described further included the step of applying pulling force to the newly helically wound pipe to cause the inter engaged edges of the strips forming the pipe to slip with respect with each other so as to increase the diameter of the pipe progressively until it engages the walls of the conduit to be relined. 100041 A further patent application by the applicant, PCT/AU88/00311 titled "Slip Control for Helically Wound Pipes" deals with the problem of positively unlocking the pipe to allow for a controlled diameter change. 100051 The technology described above can be described as an expanding helically wound pipe technology. The expanding helically wound pipe technology involves positioning a winding cage underground within a host conduit or pipe, or adjacent to a host conduit or pipe, as is described in the above mentioned International Patent Application No. PCT/AU87/00069. This often requires enlargement of the access area adjacent the pipe to be relined to accommodate the winding cage. Enlargement, or "chop-out", typically involves jack hammering concrete which takes considerable effort and time.

WO 2013/138869 PCT/AU2013/000301 2 100061 Even where pipes are wound at a final diameter using a winding cage underground within a host pipe (without subsequently expanding the wound pipe), enlargement of the access area adjacent the pipe to be relined to accommodate the winding cage is often required. 100071 It is an object of the present invention to overcome at least some of the problems outlined above or to at least offer the public a useful choice. SUMMARY [00081 According to a first aspect, there is provided a winding cage for winding a helically wound pipe from an elongate ribbed strip having at least one rib and having opposed joinable edge portions, the winding cage forming a guide for the helically wound pipe, the winding cage including: a plurality of spaced apart strip guide rollers, each strip guide roller having a proximal end and a distal end, the strip guide rollers spaced around a longitudinal winding cage axis; a proximal support frame having a plurality of guide roller proximal end supports for supporting the proximal ends of the strip guide rollers; a distal support frame having a plurality of guide roller distal end supports for supporting the distal ends of the strip guide rollers, the proximal and distal support frames spaced apart from each other and together supporting the plurality of spaced apart strip guide rollers; a proximal frame bridge, the bridge extending away from the proximal frame and bridging between spaced apart first and second ends of the proximal support frame; and a proximal mount on the bridge and a distal mount on the distal support frame, the proximal and distal mounts for receiving a strip driver assembly, the strip driver assembly for driving the strip into the winding cage, whereby the bridge forms part of a mouth opening into the winding cage, the mouth for accommodating the strip driver assembly. [00091 In one embodiment, the mouth has a width greater than a length of a longest of the plurality of spaced apart strip guide rollers. [00101 In one embodiment, a winding cage includes at least one rib support roller, the at least one rib support roller extending radially inwards from a shaft extending between the proximal and distal support frames, whereby, in use, the rib support roller engages at least one rib of the strip, thereby laterally guiding the strip. [0011] In one embodiment the at least one rib support roller includes at least one flange, in use the flange engaging the at least one rib of the strip, thereby laterally guiding the strip.

WO 2013/138869 PCT/AU2013/000301 3 [0012] In one embodiment, each strip guide roller is rotatable about a strip guide roller axis, the strip guide roller axes at a first radius spaced around the longitudinal winding cage axis and wherein the at least one rib support roller is rotatable around a rib support roller axis, the rib support roller axis spaced from the longitudinal winding page axis at a second radius, the second radius smaller than the first radius. [00131 In one embodiment the winding cage includes a rib support roller, the rib support roller mounted to rotate about an axis that extends radially inwards from a shaft extending between the proximal and distal support frames, whereby, in use, the rib support roller engages at least one rib of the strip, thereby laterally guiding the strip. [00141 According to a second aspect, there is provided winding cage for winding a helically wound pipe from an elongate ribbed strip having at least one rib and having opposed joinable edge portions, the winding cage forming a guide for the helically wound pipe, the winding cage including: a plurality of spaced apart strip guide rollers, each strip guide roller having a proximal end, a distal end and a strip guide roller axis, the strip guide rollers axes spaced around a longitudinal winding cage axis at a first radius, the strip guide rollers having a strip roller maximum radius; a proximal support frame having a plurality of proximal guide roller supports for supporting the proximal ends of the strip guide rollers; a distal support frame having a plurality of distal guide roller supports for supporting the distal ends of the strip guide rollers, the proximal and distal support frames spaced apart from each other and together supporting the plurality of spaced apart strip guide rollers; and a plurality of rib support rollers, each rib support roller having a rib support roller axis, the rib support axes spaced around the longitudinal winding cage axis at a second radius, the second radius smaller that the first radius. [00151 In one embodiment, the at least one rib support roller includes at least one flange, in use the flange engaging the at least one rib of the strip, thereby laterally guiding the strip. 100161 In one embodiment, the rib support roller is mounted to rotate about an axis that extends radially inwards from a shaft extending between the proximal and distal support frames. [0017] According to a third aspect, there is provided a winding machine for winding a helically wound pipe from an elongate ribbed strip having at least one rib and having opposed joinable edge portions, the winding machine including a winding cage and a powered strip driver assembly for driving the strip into the winding cage, the winding cage forming a guide for the helically wound pipe, the winding cage WO 2013/138869 PCT/AU2013/000301 4 including: a plurality of spaced apart strip guide rollers, each strip guide roller having a proximal end and a distal end, the strip guide rollers spaced around a longitudinal winding cage axis; a proximal support frame having a plurality of guide roller proximal end supports for supporting the proximal ends of the strip guide rollers; and a distal support frame having a plurality of guide roller distal end supports for supporting the distal ends of the strip guide rollers, the proximal and distal support frames spaced apart from each other and together supporting the plurality of spaced apart strip guide rollers, wherein the proximal support frame includes a first end and a second end, the first and second ends spaced apart so as to provide an opening for accommodating the strip driver assembly. 100181 In one embodiment, the proximal support frame is shaped to describe part of an annulus between the spaced apart ends. (0019] In one embodiment, the spaced apart ends of the proximal support frame form part of a mouth, the mouth having a width greater than a length of a longest of the plurality of spaced apart strip guide rollers. [00201 In one embodiment, the bridge bridging between the spaced apart first and second ends of the proximal support frame, whereby the bridge forms part of the mouth, the mouth for accommodating the strip driver assembly. [00211 In one embodiment, wherein the bridge includes a mount, the mount connecting the strip driver assembly to the bridge and thereby to the proximal support frame. [00221 In one embodiment, the strip driver assembly includes a strip entrance and a strip exit and a pair of pinch rollers for driving the strip, the pinch rollers located adjacent to the strip exit, wherein the pinch rollers include a driver mounted around a pinch roller drive shaft, whereby the spaced apart ends of the annulus accommodate a portion of the strip driver assembly adjacent the driver. [00231 In one embodiment, the driver includes a sprocket, the sprocket driven by a looped transmission member. 100241 In one embodiment, the looped transmission member includes a chain. [00251 In one embodiment, the looped transmission member includes a belt.

WO 2013/138869 PCT/AU2013/000301 5 [00261 In one embodiment, the winding machine includes at least one rib support roller, the at least one rib support roller extending radially inwards from a shaft extending between the proximal and distal support frames, whereby, in use, the rib support roller engages at least one rib of the strip, thereby laterally guiding the strip. 100271 In one embodiment, the at least one rib support roller includes at least one flange, in use the flange engaging the at least one rib of the strip, thereby laterally guiding the strip. 100281 In one embodiment, each strip guide roller is rotatable about a strip guide roller axis, the strip guide roller axes at a first radius spaced around the longitudinal winding cage axis; and the at least one rib support roller is rotatable around a rib support roller axis, the rib support roller axis spaced from the longitudinal winding cage axis at a second radius, the second radius smaller than the first radius. 100291 In one embodiment, the winding machine includes a rib support roller, the rib support roller mounted to rotate about an axis that extends radially inwards from a shaft extending between the proximal and distal support frames, whereby, in use, the rib support roller engages at least one rib of the strip, thereby laterally guiding the strip. [00301 According to a fourth aspect, there is provided a winding machine for winding a helically wound pipe from an elongate ribbed strip having at least one rib and having opposed joinable edge portions, the winding machine including a winding cage and a powered strip driver assembly for driving the strip into the winding cage, the winding cage forming a guide for the helically wound pipe, the winding cage including: a plurality of spaced apart strip guide rollers, each strip guide roller having a proximal end, a distal end and a strip guide roller axis, the strip guide rollers axes spaced around a longitudinal winding cage axis at a first radius, the strip guide rollers having a strip roller maximum radius; a proximal support frame having a plurality of proximal guide roller supports for supporting the proximal ends of the strip guide rollers; a distal support frame having a plurality of distal guide roller supports for supporting the distal ends of the strip guide rollers, the proximal and distal support frames spaced apart from each other and together supporting the plurality of spaced apart strip guide rollers; and a plurality of rib support rollers, each rib support roller having a rib support roller axis, the rib support axes spaced around the longitudinal winding cage axis at a second radius, the second radius smaller that the first radius.

WO 2013/138869 PCT/AU2013/000301 6 [00311 In one embodiment the at least one rib support roller includes at least one flange, in use the flange engaging the at least one rib of the strip, thereby laterally guiding the strip. 10032] In one embodiment the rib support roller is mounted to rotate about an axis that extends radially inwards from a shaft extending between the proximal and distal support frames. 100331 A detailed description of one or more embodiments of the invention is provided below along with accompanying figures that illustrate by way of example the principles of the invention. While the invention is described in connection with such embodiments, it should be understood that the invention is not limited to any embodiment. On the contrary, the scope of the invention is limited only by the appended claims and the invention encompasses numerous alternatives, modifications and equivalents. For the purpose of example, numerous specific details are set forth in the following description in order to provide a thorough understanding of the present invention. 100341 The present invention may be practiced according to the claims without some or all of these specific details. For the purpose of clarity, technical material that is known in the technical fields related to the invention has not been described in detail so that the present invention is not unnecessarily obscured. BRIEF DESCRIPTION OF DRAWINGS [00351 Embodiments of the present invention will be discussed with reference to the accompanying drawings wherein: [00361 Figure 1 shows a schematic cross-sectional view of an underground conduit being relined using a prior art winding machine. 100371 Figure 2a is an isometric view of a winding machine that can be used in a conduit such as that shown in Figure 1. [00381 Figure 2b shows a schematic cross-sectional view of the winding machine of Figure 2a within an invert of an underground conduit. [00391 Figure 3a is a cross-sectional view of a strip (or "profile") used to helically wind pipe as shown in Figure 1. [00401 Figure 3b is a cross-sectional view of an alternative strip used to helically wind pipe as shown in Figure 1.

WO 2013/138869 PCT/AU2013/000301 7 [0041] Figure 3c is a cross-sectional view showing two convolutions of the strip of Figure 3ajoined together. [00421 Figure 4 is a similar view to Figure 1 but illustrates use of a winding machine according to the present invention. 100431 Figure 5 is an isometric view of a winding machine according to the invention. 100441 Figure 6 shows a schematic cross-sectional view of the winding machine of Figure 5 within an invert of an underground conduit. [00451 Figure 7a is a front view of the winding machine shown in Figure 5. [00461 Figure 7b is a magnified view of a portion of the winding machine shown in Figure 7a with portions of the machine removed to show internal detail. [00471 Figure 7c is a cross sectional view taken through section line 7c-7c on Figure 7b. [00481 Figures 8, 9 and 1.0 are an isometric view of the winding cage that forms part of the winding machine of Figure 5. [00491 Figure 11 shows rib support rollers of the winding cage of Figures 8, 9 and 10. [00501 Figure 12 is an isometric view of an alternative winding cage to that shown in Figure 8. [00511 Figure 13 is an isometric view of a further alternative winding cage to that shown in Figure 8, the machine having different rib support rollers to the rib support rollers of Figure 12. [00521 Figure 14 shows rib support rollers of the winding cage of Figure 13. 10053] Figure 15 is a diagrammatic end view of view of the winding cage of Figure 13. DESCRIPTION OF EMBODIMENTS [00541 Referring to Figures 1, 2a and 2b, it is known to reline conduits such as sewer or storm water conduits with helically wound pipe 9 using a pipe winding machine 50. The conduit or host pipe being relined may be of circular, oval, square or rectangular cross-section for instance. Irrespective of the shape of the host pipe, it is generally desirable to wind a new pipe with a cross-sectional area as close as possible to a cross-sectional area of the host pipe. Where winding a new pipe into a host pipe having a WO 2013/138869 PCT/AU2013/000301 8 circular cross-section, it is generally desirable to minimise the distance between the outside diameter of the newly wound pipe and the inside diameter of the host pipe. This is the case irrespective of whether, subsequent to winding, the new pipe is expanded out to a larger diameter or not. [00551 Some clearance is required between the wound pipe 9 and the host pipe 5 in order to allow the newly wound pipe 9 to move longitudinally with respect to the host pipe 5 before the wound pipe 9 is expanded. [00561 It is often necessary to enlarge the access area adjacent the pipe to be realigned to accommodate the winding cage 60 of the winding machine 50. The enlarged or "chop-out" area 6 is illustrated in Figure 1. The enlargement or chop-out typically involves jack-hammering concrete which takes considerable effort and time. 10057] The extent of the chop-out required can be more clearly appreciated with reference to Figure 2b. In Figure 2b the inside wall of the host pipe 5 is illustrated and the winding cage 60 is shown protruding through into the concrete into the region 6. In practice, the arrangement shown in Figure 2b does not occur. Instead, the region of the conduit or host pipe 5 where the winding cage is to be positioned is enlarged in the region 6 as shown is Figure 1. [0058] Turning now to Figures 3a and 3c, a composite strip useable with the winding machine illustrated in figure 2 or the winding machine according to the invention of Figure 5 are shown. These strips of profiles include a base 12, a male edge 14, a female edge 18 and a plurality (in this case 3) of upstanding ribs 20. Each rib 20 has a crown portion 25. The base 12 of the strip forms the inner surface of the wound pipe. 100591 An alternative strip 10 that can also be wound into a helical pipe is shown in Figure 3b. 100601 Figures 3a and 3c show the mechanical join between female edges 18 and male edges 14'. The strip 10 has a primary male locking portion 15 and a secondary, or sacrificial, male locking portion 16 on its male edge 14. On its female edge 18, the strip 10 has a female primary locking portion 35 and a female secondary locking portion 36. 100611 The function of the primary and secondary locking portions are as described in the applicants earlier Patent Applications Nos PCT/AU87/00069 and PCT/AU88/00311 (referred to above) that are hereby incorporated by reference. 100621 Various alternative joining methods may be used. For instance, welding or gluing may be used with different male and female edge portions (not shown).

WO 2013/138869 PCT/AU2013/000301 9 [00631 A winding machine 100 according to the invention is shown in Figures 4, 5 and 6. The winding machine 100 is used for helically winding a helically wound pipe from an elongate rib strip such as the strip shown in Figure 3a. The winding machine 100 includes a winding cage 110 and a powered strip driver assembly in the form of a drive tray 160 for driving the strip into the winding cage 110. The winding cage 110 forms a guide for the helically wound pipe. The winding cage 110 includes a proximal and a distal support frame 200 and 270 respectively. The proximal frame 200 and the distal frame 270 are spaced apart from each other and support a plurality of circumferentially spaced apart strip guides in the form of rollers 130 that extend there-between. The proximal support frame 200 is shaped to form part of an annulus. [00641 The drive tray 160 has a mounting plate 169 that attaches to the winding cage 110 as can be seen in figures 5 and 6. Drive tray mounting plate receiving mounts are most clearly shown in Figures 8, 9 and 10. [00651 Lifting hooks 112 and 113 are provided at the top of the winding cage 110 for lifting and manoeuvring the winding cage 110 and winding machine 100. [00661 Turning to Figure 8, the winding cage 110 is more clearly shown with the drive tray removed. The proximal support frame 200 has spaced apart ends 202 and 204 to accommodate the drive tray 160. This figure also shows how the proximal support frame 200 includes roller proximal end supports 134 and the distal support frame 270 includes roller distal end supports 136 to support rollers 130 that span between frame 200 and 270. [00671 The winding cage 110 includes a proximal frame bridge 300, the bridge 300 bridging between the spaced apart first and second ends 202 and 204 of the proximal support frame 200. The bridge extends away from the proximal frame 200 and bridges between spaced apart first and second ends 202, 204 of the proximal support frame 200. [00681 Again referring to Figure 8, a proximal mount 390 on an offset plate 315, which forms part of the bridge 300, and a distal mount 290 on the distal support frame 270 are shown. The proximal and distal mounts 390, 290 are for receiving the strip driver assembly. [00691 The bridge 300 is shaped to form part of a mouth 320, the mouth 320 accommodating the strip driver assembly in the form of a drive tray 160. [00701 Figure 8 shows that the bridge includes an offset plate 315 and a pair of linking plates 316 and 317. A slightly different linking plate 316' is shown for the winding cage of Figures 12 and 13.

WO 2013/138869 PCT/AU2013/000301 10 100711 Referring to Figures 7a and 7b, the axes 131 of two of the spaced apart strip guide rollers 130 are shown. These strip guide rollers axes 131 are spaced around a longitudinal winding cage axis 11 at a first radius Ri. [00721 Again referring to Figure 7a, it can be seen that the drive tray 160 has a drive tray entrance 162 that, in use, receives a strip 10 having a male edge 14 and a female edge 18 (the strip shown in Figure 3a for instance). The drive tray also has a pair of pinch rollers that can be seen in the enlarged view of Figure 7b and the cross-sectional view taken through section line 7c-7c of Figure 7c. The pinch rollers drive the strip 10 into the cage 110. The pinch rollers 175 and 170, most clearly seen in Figure 7c, are located adjacent the drive tray strip exit 168 as indicated in Figure 7b. [00731 Referring again to Figure 7b, this view has a number of the rollers 130 removed and has a portion of the proximal frame removed so as to better illustrate the pinch roller 175 and its associated bearings 178, 179 and driver in the form of a sprocket 180 driven by a looped transmission member in the form of a chain 190. [00741 Referring again to figure 7c, the strip 10 enters the gap IOA between the rollers 175 and 170. Pinch roller 170 opposes the pinch roller 175 and acts on the opposite side of the strip 10 to the roller 175. The drive roller 175 frictionally engages with the base of the strip 10 and is driven by a sprocket 180. 100751 The size and configuration of the gap 1OA and the outer pinch roller 170 can both be varied to suit the strip being wound. 100761 The pinch roller 175 is cantilevered out from the bearings into the pipe 9 being wound. The pinch roller 170 is mounted to the drive tray body 165 as illustrated in Figure 7c. With conventional winding cages, the proximal frame 200 is located well away from the sprocket 180 and associated drive tray body zone 165 illustrated in Figure 7c. This can be seen by referring to Figure 2a in which the primary frame 61 is spaced outboard of the drive tray 80 and a long distance from the secondary frame 62. With the arrangement shown in Figure 2a, it can be seen that the rollers 70 are long compared to the rollers 130 of the embodiment of the invention illustrated in Figure 8. [00771 The shorter rollers 130 of the embodiment of the invention illustrated in Figure 8 can have a smaller diameter due to their reduced span. That is, for the same design load, the rollers 130 of the embodiment of the invention shown in Figure 8 can have a significantly smaller diameter than the required diameter of the roller 70 of the winding cage shown in Figure 2a. This is a significant advantage in that it allows the overall diameter to the winding cage 110 to be reduced.

WO 2013/138869 PCT/AU2013/000301 11 10078] A further feature that facilitates a reduction in the diameter of the cage 110 is shown in Figure 11. The arrangement includes a shaft 350 that extends from the proximal frame 200 to the distal frame 270. In the embodiment shown, the shaft 350 is fixed (it does not rotate). The shaft 350 is offset in a radial inwards direction when compared to the roller 140 and the remaining rollers 130 as illustrated in Figure 8. This radial offset allows a larger diameter roller 150 rotating about an axis 150A and having a surface 1 50E to be provided without increasing the overall outside diameter of the winding cage 110 (the axis 150A is radially inboard of the axes of rollers 130). At the same time, the roller 150 is of sufficient diameter such that its surface I 50E engages the crowns 38 and 39 of the female locking portions 35 and 36. 100791 Figure 11 also illustrates how the strip 10 is guided and stabilised in a direction lateral to the strip or longitudinal to the pipe. Specifically, Figure 11 shows rollers 616 and 626. These rollers rotate about shafts having axes that are substantially perpendicular to the base 12 of the strip 10. The rollers 616 and 626 are compact and, importantly, do not add to the overall outer diameter of the winding cage 110. The direction of rotation of the rollers 616 and 626 varies depending on whether they are supporting the strip 10 against a lateral load one way or the other. Having separate rollers 616 and 150 performing different functions provides additional design flexibility as compared to earlier arrangements where a large single roller 75 having ribs 76 was previously employed such as is shown in Figure 2a. 10080] Figure 14 is a similar illustration to that of Figure 11, but illustrates an alternative strip guiding arrangement. Figure 14 shows roller 630. This roller rotates about an axis 639. Figure 13 shows a plurality of rib support rollers 630 circumferentially spaced around the longitudinal winding case axis I 11. The rib support roller axes 639 are spaced from the longitudinal winding cage axis 111 at a second radius R 2 . The second radius R 2 is smaller than the first radius R, ( R 2 < RI). 100811 Figure 15 is a diagrammatic end view of the winding cage of Figure 13 and shows a rib support rollers, the rib support roller having a rib support roller axis. In practice there will be a number (3 or 4 for instance) of rib support rollers each having an axis. As stated above and as is also shown in figure 13, the rib support axes are spaced around the longitudinal winding cage axis at a second radius R 2 , and the second radius is smaller that the first radius R 1 . The smaller second radius R 2 provides a significant advantage. It allows a flanged roller to be used without increasing the overall diameter of the winding cage (in contrast to the arrangement shown in Figure 2a). 100821 Each rib support roller 630 has a plurality of flanges 638, the flanges 638 engaging the ribs 20 of the strip 10, thereby laterally guiding the strip 10.

WO 2013/138869 PCT/AU2013/000301 12 [00831 The winding machine and winding cage described above with reference to the drawings provides many advantages as compared to earlier winding machines and winding cages. A number of those advantages have been explained above and some further advantages are that the cage 1 10 becomes smaller and is therefore able to be manoeuvred more easily below ground. This is particularly useful where access is tight and where there are direction changes from an access hole. 100841 Throughout the specification and the claims that follow, unless the context requires otherwise, the words "comprise" and "include" and variations such as "comprising" and "including" will be understood to imply the inclusion of a stated integer or group of integers, but not the exclusion of any other integer or group of integers. 100851 The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement of any form. of suggestion that such prior art forms part of the common general knowledge. [00861 It will be appreciated by those skilled in the art that the invention is not restricted in its use to the particular application described. Neither is the present invention restricted in its preferred embodiment with regard to the particular elements and/or features described or depicted herein. It will be appreciated that the invention is not limited to the embodiment or embodiments disclosed, but is capable of numerous rearrangements, modifications and substitutions without departing from the scope of the invention as set forth and defined by the following claims.

Claims (19)

1. A winding cage for winding a helically wound pipe from an elongate ribbed strip having at least one rib and having opposed joinable edge portions, the winding cage forming a guide for the helically wound pipe, the winding cage including: a plurality of spaced apart strip guide rollers, each strip guide roller having a proximal end and a distal end, the strip guide rollers spaced around a longitudinal winding cage axis; a proximal support frame having a plurality of guide roller proximal end supports for supporting the proximal ends of the strip guide rollers; a distal support frame having a plurality of guide roller distal end supports for supporting the distal ends of the strip guide rollers, the proximal and distal support frames spaced apart from each other and together supporting the plurality of spaced apart strip guide rollers; a proximal frame bridge, the bridge extending away from the proximal frame and bridging between spaced apart first and second ends of the proximal support frame; and a proximal mount on the bridge and a distal mount on the distal support frame, the proximal and distal mounts for receiving a strip driver assembly, the strip driver assembly for driving the strip into the winding cage, whereby the bridge forms part of a mouth opening into the winding cage, the mouth for accommodating the strip driver assembly.

2. The cage as claimed in claim 1 wherein the mouth has a width greater than a length of a longest of the plurality of spaced apart strip guide rollers.

3. The winding cage as claimed in claim 1 including at least one rib support roller, the at least one rib support roller extending radially inwards from a shaft extending between the proximal and distal support frames, whereby, in use, the rib support roller engages at least one rib of the strip, thereby laterally guiding the strip.

4. The winding cage as claimed in the preceding claim wherein the at least one rib support roller includes at least one flange, in use the flange engaging the at least one rib of the strip, thereby laterally guiding the strip.

5. The winding cage as claimed in claim 4 wherein each strip guide roller is rotatable about a strip guide roller axis, the strip guide roller axes at a first radius spaced around the longitudinal winding cage axis and 14 wherein the at least one rib support roller is rotatable around a rib support roller axis, the rib support roller axis spaced from the longitudinal winding cage axis at a second radius, the second radius smaller than the first radius.

6. The winding cage as claimed in claim 4 including a rib support roller, the rib support roller mounted to rotate about an axis that extends radially inwards from a shaft extending between the proximal and distal support frames, whereby, in use, the rib support roller engages at least one rib of the strip, thereby laterally guiding the strip.

7. A winding machine for winding a helically wound pipe from an elongate ribbed strip having at least one rib and having opposed joinable edge portions, the winding machine including a winding cage and a powered strip driver assembly for driving the strip into the winding cage, the winding cage forming a guide for the helically wound pipe, the winding cage including: a plurality of spaced apart strip guide rollers, each strip guide roller having a proximal end and a distal end, the strip guide rollers spaced around a longitudinal winding cage axis; a proximal support frame having a plurality of guide roller proximal end supports for supporting the proximal ends of the strip guide rollers; and a distal support frame having a plurality of guide roller distal end supports for supporting the distal ends of the strip guide rollers, the proximal and distal support frames spaced apart from each other and together supporting the plurality of spaced apart strip guide rollers, wherein the proximal support frame includes a first end and a second end, the first and second ends spaced apart so as to provide an opening for accommodating the strip driver assembly.

8. The winding machine as claimed in claim 7 wherein the proximal support frame is shaped to describe part of an annulus between the spaced apart ends.

9. The winding machine as claimed in claim 7 wherein the spaced apart ends of the proximal support frame form part of a mouth, the mouth having a width greater than a length of a longest of the plurality of spaced apart strip guide rollers.

10. The winding machine as claimed in claim 7 including a proximal frame bridge, the bridge bridging between the spaced apart first and second ends of the proximal support frame, whereby the bridge forms part of the mouth, the mouth for accommodating the strip driver 15 assembly.

11. The winding machine as claimed in the preceding claim wherein the bridge includes a mount, the mount connecting the strip driver assembly to the bridge and thereby to the proximal support frame.

12. The winding machine as claimed in claim 7 wherein the strip driver assembly includes a strip entrance and a strip exit and a pair of pinch rollers for driving the strip, the pinch rollers located adjacent to the strip exit, wherein the pinch rollers include a driver mounted around a pinch roller drive shaft, whereby the spaced apart ends of the annulus accommodate a portion of the strip driver assembly adjacent the driver.

13. The winding machine as claimed in the preceding claim wherein the driver includes a sprocket, the sprocket driven by a looped transmission member.

14. The winding machine as claimed in the preceding claim wherein the looped transmission member includes a chain.

15. The winding machine as claimed in the preceding claim wherein the looped transmission member includes a belt.

16. The winding machine as claimed in claim 7 including at least one rib support roller, the at least one rib support roller extending radially inwards from a shaft extending between the proximal and distal support frames, whereby, in use, the rib support roller engages at least one rib of the strip, thereby laterally guiding the strip.

17. The winding machine as claimed in the preceding claim wherein the at least one rib support roller includes at least one flange, in use the flange engaging the at least one rib of the strip, thereby laterally guiding the strip.

18. The winding machine as claimed in the preceding claim wherein each strip guide roller is rotatable about a strip guide roller axis, the strip guide roller axes at a first radius spaced around the longitudinal winding cage axis; and wherein the at least one rib support roller is rotatable around a rib support roller axis, the rib 16 support roller axis spaced from the longitudinal winding cage axis at a second radius, the second radius smaller than the first radius.

19. The winding machine as claimed in claim 7 including a rib support roller, the rib support roller mounted to rotate about an axis that extends radially inwards from a shaft extending between the proximal and distal support frames, whereby, in use, the rib support roller engages at least one rib of the strip, thereby laterally guiding the strip.