• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method has been described for applying a protective covering around a section (7) of a pipe (1) consisting of a metal tube (2,3) provided with a plastic protective jacket (5,6), which protective jacket (5, 6) interrupted or removed at the location of said section (7). Around said section (7) and partially overlapping with edge portions of the protective sheath (5, 6), a plate (10) is bent of a plastic material that can be fused with the material of the protective sheath (5, 6), with tangent surfaces (35) thermal ribbons (50) interposed between the protective jacket (5,6) and the plate (10). The plate is attached to the edge portions of the protective sheath (5.6) by ohmic heating.
    公开号:BE1019564A3
    申请号:E2010/0648
    申请日:2010-11-02
    公开日:2012-08-07
    发明作者:Cornelis Christianus Rombouts
    申请人:C C Rombouts Kunststof Techniek Holding B V；
    IPC主号:
    专利说明:

    rhythm: Method for coating a connection between two tubes
    The present invention generally relates to the attachment of plastic parts to each other, more in particular parts made of a thermoplastic plastic.
    There are plastics that can be glued, or that can be softened by applying solvent and can therefore be glued together. However, there are thermoplastic plastics that cannot be treated in such a way, or only with great difficulty, and two important examples in that category are polypropylene (PP) and polyethylene (PE). The present invention therefore relates in particular to fixing PP and PE parts together, but it is noted that application of the method proposed by the present invention is not limited to PP or PE but that this method can also be applied to other thermoplastic plastics.
    The present invention relates in particular to a method for making a connection between steel pipes which are provided with a plastic coating for protection, for example a PP coating or a PE coating. Such tubes exist in different diameters, and are used, for example, for the transport of natural gas, and to protect these tubes it is essential that they are completely and seamlessly surrounded with a plastic jacket. The tubes are manufactured in a factory, with a specific standard length that can be, for example, 6 m, but can also be 20 m, wherein a plastic sheath of, for example, a PP is applied through a suitable primer. The two ends of the tubes are thereby left clear of this plastic sheath, or this sheath is removed, over a length of about 20 cm, to allow the steel tubes to be welded together to thus form a transport line. This welding together is done in situ. Figure 1 is a side view which schematically shows a part of the pipe 1 thus formed at the level of such a weld. The figure shows the exposed end segments 2 and 3 of the metal pipes with the weld 4, as well as the plastic jackets 5 and 6. The figure clearly shows that after welding, the pipe 2 is protected along its entire length by the plastic jacket, except always the coupling sections 7 consisting of the end segments 2 and 3 with the weld 4. In order to obtain a really good protection for the pipe 1, it is essential that the coupling sections 7 are also provided with a good and seamlessly adhering coating.
    Dutch patent 1033399 describes a method for obtaining such a protective coating. First, a sheet-like mechanically stable material 10 is bent around a coupling section 7 and around the adjacent end parts 8, 9 of the jackets 5, 6, as clearly shown on a larger scale in Figure 2. The material 10 extends in a circumferential direction through an angle greater than 360 °, so that end portions of the material 10 overlap. The bent material 10 thus forms a closed, cylindrical sleeve which is designated by the reference numeral 20. The axial end portions 11, 12 of this sleeve 20 are hermetically attached to the said end portions 8, 9 of the jackets 5, 6, and the said each other overlapping end portions of the material 10 (not shown in Figure 2) are also attached to each other. An annular space 13 is thus defined between the sleeve 20, metal end segments 2, 3 and the end parts 8, 9 of the jackets 5, 6. An opening 14 is made in the sleeve 20 through which a curing material 15 is introduced in the liquid state in said space 13. It is ensured that the air present in that space can escape, so that the space 13 is completely filled. After curing, the material 15 forms the desired coating.
    An important aspect of this known method is the choice of materials. In comparable, per se known methods, a cylindrical mold is used instead of the said sleeve 20 which does not adhere to the jackets 5, 6 and does not adhere to the filling material 15, and which is removed after the filling material 15 has hardened. Among other things, a disadvantage is that the filling material 15 is exposed, wherein in particular the seam between the filling material 15 and the jackets 5, 6 is vulnerable. The said patent, on the other hand, describes that the sleeve 20 adheres to the casings 5, 6, and that the filler material 15 adheres to the sleeve 20 and to the steel 2, 3, 4, through a suitable adhesive primer. A particular problem that the said patent solves concerns the fact that the material of the jackets 5, 6 is typically a PP or similar material, and that it is not possible to attach different materials to, for example, PP or PE. It is, however, possible to make the sleeve 20 from, for example, PP or PE or from the same plastic material and to merge it with the material of the jackets 5, 6, but then the filling material 15 cannot adhere to the sleeve 20. The said patent solves this problem by manufacturing the sleeve from a PP or PE sheet 10 which is provided on its inner surface 16, i.e. the surface facing the space 13, with a layer of glass fiber fused into the PP / PE material, which in figure 2 is schematically indicated at 17. As filling material 15, a curing material can then be used which adheres to the adhesive primer on the steel 2, 3, 4 as well as to the glass fiber 17 on the inner surface 16 of the tube 20.
    It is an important object of the present invention to further improve this known method. r
    In the method as described in Dutch patent 1033399, the sheet 10 is wound on the outer surface of the casing 5, 6; as a result, the space 13 has an outer radius which is equal to the outer radius of the casing 5, 6. The sheet has a substantial thickness of the order of a few millimeters, and as a result, the sleeve 20 has an outer radius substantially larger than the casing 5, 6. This is objectionable if the pipe 1 has to be introduced into the ground by means of an axial pushing force (pressing method): stones or the like present in the ground can damage the sleeve 20 or even pull it off the casing 5, 6.
    In the method as described in Dutch patent 1033399 use is made of a sheet 10 which is provided on one surface 16 with a fiber layer 17, typically glass fiber, fused in that surface. This fiber layer 17 complicates the connection between the material of the sheet 10 and the material of the jacket 5, 6.
    About the way in which the material of the sheet 10 is connected to the material of the jacket 5, 6, Dutch patent 1033399 only mentions that this is done by thermal welding. In practice this is done with the help of hot air. A thermal welding process based on hot air is difficult to automate and in that case requires a complicated and expensive installation. Furthermore, a thermal welding process on the basis of hot air has a drawback that there is a weld that proceeds relatively slowly in circumference, so that the entire welding process requires relatively much time. Furthermore, this process has a disadvantage that it must be carried out in the open air, and that weather influences such as rain and wind can exert a great influence on the result achieved.
    These and other aspects, features and advantages of the present invention will be further elucidated by the following description with reference to the drawings, in which like reference numerals indicate like or similar parts, wherein "below / above", "higher / lower", " left / right "etc only relate to the orientation shown in the figures, and in which: figure 1 is a side view of a pipe at the level of a weld; figure 2 schematically illustrates on a larger scale the protection according to the state of the art of the pipe section at the level of the weld; Figures 3 and 4 schematically illustrate some aspects of the method proposed by the present invention; Figure 5 shows a schematic perspective view of a thermal ribbon represented by the present invention; Figure 6 shows a schematic perspective view of a plate provided with a thermal ribbon; Figure 7 is a schematic cross-sectional view illustrating the use of the thermal ribbon.
    Figure 3 schematically illustrates some aspects of the method proposed by the present invention. Shown is a sheet-like, bendable and mechanically stable material 10, in cross-section, which at a first surface 16 is provided with a fiber layer melted into the surface, as is known per se. A suitable thickness of this sheet material 10 is 3 mm, but this thickness is not critical; in the following, this sheet-like material 10 will be referred to by the term "plate". The material of the plate 10 is preferably a PP or PE or at least a material fusible with PP or PE, and the fiber layer 17 consists of glass fiber, preferably a woven mat. When the fiber layer 17 is fused, the entire surface 16 is typically covered; it should be borne in mind here that typically a large plate is provided with the fiber layer, and that that large plate is subsequently sawn or cut into strips to form a plurality of plates. According to an aspect of the present invention, the fiber layer 17 is removed along opposite edges of the plate 10, so as to form edge regions 33, 34 that are free of fibers. Removal can be done for example by milling, sanding or scraping.
    The figure further shows a part of the coupling section 7, i.e. the combination of the end segments 2, 3 and the weld 4, with the adjacent end portions of the casing 5, 6. The end segments 2, 3 and the weld 4 can, if desired, suitably prepared, typically cleaned by sandblasting and provided with an adhesive primer. According to an aspect of the present invention, adjacent to the coupling section 7, a part of the outside of each casing 5, 6 is removed, so as to provide each casing 5, 6 with a recessed lying end platform 31, 32. The removal can for instance be done by milling or sanding.
    It is noted that the order of manufacturing the edge regions 33, 34 and the recessed end plateaus 31, 32 is not relevant.
    The plate 10 is then folded around the coupling section 7, overlapping with the recessed lying end plates 31, 32 of the jackets 5, 6. The axial length of the recessed lying end plates 31, 32 is chosen such that the plate 10 is more than sufficient in that storeys fits. In formula: L31 + L7 + L32> L10, where: L31 is the axial length of the first end plate 31, L7 is the axial length of the coupling section 7, L32 is the axial length of the second end plate 32, L10 is the axial length of the plate is 10.
    The radial depth of the deepened end plates 31, 32 is chosen substantially equal to, or only slightly different from, the thickness of the plate 10.
    The radial dimension (width) of the fiber-free edge regions 33, 34 is chosen such that the axial length of the remaining fiber layer 17 is substantially equal to the axial length of the coupling section 7.
    All this is preferably symmetrical, that is to say that the widths of the fiber-free edge regions 33, 34 are equal to each other and that the axial lengths of the end plates 31, 32 are equal to each other.
    Figure 4 shows on the left that the fiber-free edge region 33 of the plate 10 lies on the first end plate 31, and that the outer diameter of the sleeve 20 formed by the curved plate 10 is substantially equal to the outer diameter of the jacket 5. The interface 35 between the fiber-free edge region 33 and the first end plate 31 are free of fibers, while the outer surface of the space 13 is substantially completely covered with the fiber layer 17. Figure 4 shows the situation on the right after the heat treatment has been carried out, said interface having disappeared and the fiber-free edge region 33 is fused with the first end platform 31, so that a solid and airtight connection 36 is formed between the fiber-free edge region 33 and the first end platform 31. Because during the heat treatment also radially inwardly directed pressure is exerted on the edge regions 33, 34 of the curved plate 10, the outer diameter of the sleeve 20 formed by the curved plate 10 may be slightly reduced: it is preferable that in the fused state the outer diameter of the sleeve 20 is equal to the outer diameter of the casing 5, 6.
    Figure 4 shows on the left that a gap 37 remains between the sleeve 20 and the original, non-recessed part of the jacket 5. Figure 4 on the right shows that this gap 37 is filled with a weld 38, so as to form a pipe 1 with a gapless surface area.
    The method discussed above with reference to Figs. 3 and 4 starts from the situation that the casing 5, 6 has a substantial thickness, more than thicker than the plate 10, so that sufficient casing material remains under the end plateaus 31, 32. However, the thickness of the casing 5, 6 is a fact that the present invention is not in control; it is therefore conceivable that the tubes are provided with a relatively thin jacket. In that case it is not possible to provide a floor with a depth equal to the plate thickness. In such a case, the present invention proposes a variant in which a recess is provided with a relatively small depth, or wherein no recess is provided at all in the casing 5, 6. In both cases the pipe 1 will then have a larger diameter. have at the location of the plate 10 in comparison with the outer diameter of the casing 5, 6. The present invention then proposes to bevel the side edges of the plate 10, in the surface opposite the edge regions 33, 34, at an angle of 30 ° or less, to make the transition from the casing diameter to the sheet diameter more gradually. to make. It is noted that if no recess is provided in the casing 5, 6 at all, the gap 37 described above does not occur. It is further noted that if it is not intended to provide a floor, it is nevertheless advisable to sand the surface of the casing to remove any dirt and unevenness.
    Details of the method of performing the heat treatment, i.e., thermal welding, proposed by the present invention will now be discussed with reference to FIGS. 5-7. The invention proposes to use a thermal ribbon 50. Figure 5 shows a schematic perspective view of an embodiment of such a ribbon. The ribbon 50 comprises a flexible plastic carrier foil 51 provided with one or more resistance wires 52, arranged such that, when passing through the one or more resistance wires 52, a substantial part of (and preferably the entire) surface of the ribbon is heated to above the melting point. The figure illustrates one. embodiment with a plurality of resistance wires 52 which are mutually parallel and oriented in the longitudinal direction of the ribbon 50. In another embodiment (not shown), the resistance wires 52 may have a wave shape. In a special embodiment (not shown) there is a single resistance wire which extends in a zigzag pattern over substantially the full width of the ribbon 50. An advantage of a multi-wire embodiment is that in the case of wire breakage threads remain to perform the melting process; in a single-thread version, the ribbon is completely unusable. An advantage of a single-wire embodiment is that it is easier to ensure that all parts of the ribbon are heated to the same extent because the same current flows everywhere.
    The ribbon 50 can be made in a large length, for example 100 m; an important advantage is that the ribbon can be wound into a roll, and that a ribbon section with a length suitable for the relevant application is cut off at the site for thermal welding. The same ribbon can therefore be used for pipes with mutually different diameters.
    The resistance wires can be made of any suitable material, for example copper wire or steel wire. The most important requirements placed on the wire material are that it is electrically conductive, has a certain degree of resistance to dissipate energy and convert it to ohmic heat, and is sufficiently heat-conducting. Each wire 52 can have a circular cross section, but the wires can also be flattened. In the case of flattened wires 52, it can be advantageous if the body surface of the wires 52 is parallel to the body surface of the carrier film 51.
    The carrier film 51 is made of a material that can be fused with the jacket 5, 6 and the plate 10. If the casing 5, 6 is made of a PP, the plate 10 and the carrier film 51 are preferably also made of a PP.
    According to the present invention, the thermal ribbon 50 is arranged in the interface 35 between the fiber-free edge regions 33, 34 and the corresponding end plates 31, 32. Thereby it is possible that first thermal ribbons 50 are wound around the end plates 31, 32 and that thereafter the plate 10 is bent around it. Preferably, however, the thermal ribbons 50 are first applied to the fiber-free edge regions 33, 34 of the plate 10. Figure 6 is a schematic perspective view showing a plate 10, the first edge region 33 of which is still free and with a thermal ribbon 50 arranged on the second edge region 34. For easy handling of the plate 10 with the two thermal ribbons 50, each thermal ribbon 50 can be adhered by heat treatment. This can be done in advance. Figure 6 shows that the length of the thermal ribbon 50 is greater than the length of the plate 10.
    Figure 7 is a schematic cross-section, perpendicular to the axis of the conduit 1, through the plate 10 after it has been bent around the jackets 5, 6. For the sake of clarity, the jackets 5, 6 and the tubes 2, 3 are not shown in these. figure. It can clearly be seen that the plate 10 has two ends 10A and 10B, which overlap each other, in which case the second end 10B lies outside the first end 10A. At the first plate end 10A, a first end 50A protrudes from the ribbon 50, which is folded back along the outer surface of the plate. At the second plate end 10B, a second end 50B protrudes from the ribbon 50, which goes straight (tangentially) to the outside of the first ribbon end 50A. Alternatively, saw cuts could be made in the side edge of the plate 10 to cause the ribbon ends to protrude radially outwards.
    In the case of a ribbon with a plurality of mutually parallel, longitudinally directed wires 52, the second plate end 10B is preferably positioned on the first plate end 10A such that the wires 52 at the first ribbon end 50A and the wires 52 at the second ribbon end 50B with respect to are staggered.
    Crimps or the like are arranged around the side edges of the bent plate 10; this is not shown for the sake of simplicity.
    Connectors are attached to the two free ribbon ends 50A and 50B, which on the one hand make contact with all the resistance wires and on the other hand are suitable for connection to a connecting wire. These connecting wires are connected to a voltage source or current source, so that a suitable current flows through the connecting wires. Due to the resistance of these wires, heat is generated, as a result of which the materials of the casing 5, 6, of the plate 10, and of the carrier film 51 become softened and fuse together. After sufficient time, depending on the temperature and pressure achieved, the power is switched off. After the material has hardened, a strong and hermetic connection is obtained, in which the resistance wires remain.
    It may be desirable for the materials of the casing 5, 6 and of the plate 10 to fuse directly with each other. This can be achieved in a relatively simple manner if the carrier film 51 is perforated between the wires 52: the jacket 5, 6 and of the plate 10 then touch each other directly through those perforations.
    The overlapping plate ends 10A, 10B are also welded together, for example also with a ribbon 50, and finally the space 13 is filled with suitable material, for example a curing material, in the manner as described above.
    It will be clear to a person skilled in the art that the invention is not limited to the exemplary embodiments discussed above, but that various variants and modifications are possible within the scope of the invention as defined in the appended claims. Although the invention has been specifically described for the application of the application of a curved plate to a weld location of a welded pipe, the invention is equally applicable to the application of a protection around a pipe part which has been stripped of part of its weld for any reason. coat. Furthermore, the ribbon proposed by the present invention can also be used for welding together any plastic parts, including flat plates.
    Features described only for one particular embodiment are also applicable to other described embodiments. Features of different embodiments can be combined to achieve a different embodiment. Features that are not explicitly described as being essential may also be omitted.
    The reference numerals used in the claims are for the purpose of clarification only in the understanding of the claims in the light of the exemplary embodiments described, and should not be construed as being limitative in any way.
    权利要求:
    Claims (16)
    [1]
    A thermal ribbon (50) comprising: a plastic carrier film (51), preferably of a thermoplastic plastic, preferably a PP or PE; at least one resistance wire (52) arranged in the film on or a main surface of the film for melting at least a part of the ribbon but preferably the entire ribbon by means of ohmic heating.
    [2]
    A thermal ribbon according to claim 1, provided with a plurality of mutually parallel, linear or wavy resistance wires (52), or provided with a single resistance wire (52) arranged in a zigzag pattern.
    [3]
    The thermal ribbon according to claim 1 or 2, wherein the foil (51) is provided with perforations between the adjacent parts of the resistance wire or resistance wires.
    [4]
    Method for attaching two plastic parts (5, 10; 6, 10) to each other, wherein a thermal ribbon (50) according to any of claims 1-3 is applied at the location of an interface (35) between the two parts ; wherein a current of sufficient strength and sufficient duration is generated in the resistance wire or resistance wires so that by means of ohmic heating at least a part of the ribbon (50) and at least a part of the surfaces (31, 33; 32, 34) of the parts (5, 10; 6, 10) fuse together; after which the flow is canceled so that the molten plastic parts by cooling to a solid connection (36).
    [5]
    A method according to claim 4, wherein the plastic parts (5, 10; 6, 10) are made from a PP or a PE, and wherein the foil-shaped carrier material (51) of the ribbon (50) is also made from a PP or a PE.
    [6]
    Method for applying a protective covering around a section (7) of a pipe (1) consisting of a metal tube (2, 3) provided with a plastic protective jacket (5, 6), which protective jacket (5, 6 is interrupted or removed at said section (7), a plate (10) of a material with the material of the protective jacket (10) being bent around said section (7) and partially overlapping with edge portions of the protective jacket (5, 6) 5, 6) fusible plastic material, with thermal ribbons (50) interposed between the protective sheath (5, 6) and the plate (10) at the location of interfaces (35) according to any of claims 1-3; is attached to the edge portions of the protective jacket (5, 6) by the method of claim 4.
    [7]
    The method of claim 6, wherein said section (7) is a coupling section where end portions of pipe segments are axially aligned to each other by a weld (4).
    [8]
    Method according to claim 6 or 7, wherein the plastic protective jacket (5, 6) is made of a PP or a PE, wherein the plate (10) is made of a PP or a PE, and wherein the foil-shaped support material (51) of the ribbon (50) is also made of a PP or a PE, respectively.
    [9]
    A method according to any of claims 6-8, wherein thermal ribbons (50) are applied to, and preferably are attached to, edge portions (33, 34) of the plate (10) by partial fusing prior to surrounding the plate said conduit section (7) is bent.
    [10]
    Method according to any of claims 6-9, wherein the plate (10) is provided on its inner surface facing the metal tube (2, 3) with a fiber layer attached to said inner surface, preferably fused into said inner surface (17), preferably glass fiber.
    [11]
    Method according to any of claims 6-8, wherein the plate (10) is provided on its inner surface facing the metal tube (2, 3) with a fiber layer (17), preferably fused into said inner surface, fixed to said inner surface ), preferably fiberglass; wherein edge regions (33, 34) of the inner surface of the plate (10) are, if necessary, preprocessed by removing the fiber layer (17) at said edge regions (33, 34); and wherein thermal ribbons (50) are applied to, and preferably attached to, the fiber-free edge portions (33, 34) of the plate (10) by partial fusion before the plate is bent around said conduit section (7).
    [12]
    A method according to any of claims 6-11, wherein recessed plateaus (31, 32) are provided in edge portions of the protective sheath (5, 6) adjacent to said section (7) by removing a portion of the thickness of the protective jacket (5, 6), and wherein edge portions (33, 34) of the plate (10) are positioned at least partially overlapping with said trays (31, 32).
    [13]
    The method of claim 12, wherein the depth of said trays (31, 32) is substantially equal to the thickness of the plate (10).
    [14]
    A method according to claim 12 or 13, wherein a gap (37) remaining between the plate (10) and the protective jacket (5, 6) is filled with a welding bead (38).
    [15]
    Method according to any of claims 6-14, wherein a space (13) enclosed between the tube (2, 3) and the plate (10) is completely filled with a tube (2, 3) as well as a plate (10) as curing plastic material adhering to the protective jacket (5, 6).
    [16]
    A method for manufacturing a pipe (1), comprising the steps of: providing metal tubes (2, 3) provided with a plastic protective jacket (5, 6), the protective jacket being absent at end portions of the tubes has been or will be deleted; placing at least two tubes axially in line with each other; welding the tubes head to head against each other, so that a weld (4) is created; applying a protective coating around the weld (4) and the adjacent caseless end portions of the tubes by means of a method according to any of claims 6-15.
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    同族专利:
    公开号 | 公开日
    NL1037432C2|2011-05-03|
    EA021200B1|2015-04-30|
    FR2952269A1|2011-05-06|
    FR2952269B1|2015-12-11|
    PL2317203T3|2013-01-31|
    DE102010049770A1|2011-05-05|
    EA201001583A1|2011-06-30|
    EP2317203A1|2011-05-04|
    DK2317203T3|2012-09-24|
    EP2317203B1|2012-08-29|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4629216A|1982-06-29|1986-12-16|I. C. Moller A/S|Method of joining prefabricated heat insulated pipes and a welding fitting therefore|
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    RU2282781C2|2005-01-11|2006-08-27|ЗАО "МосФлоулайн"|Method and device for joining pipelines with polymeric shell|BE1021667B1|2011-10-12|2015-12-23|C.C. Rombouts Kunststof Techniek Holding B.V.|METHOD FOR COATING, PROTECTING AND REINFORCING PIPES|
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    法律状态:
    2018-01-31| MM| Lapsed because of non-payment of the annual fee|Effective date: 20161130 |
    优先权:
    申请号 | 申请日 | 专利标题
    NL1037432A|NL1037432C2|2009-11-02|2009-11-02|METHOD FOR LOCKING A CONNECTION BETWEEN TWO TUBES.|
    NL1037432|2009-11-02|
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