JP2009133474A - Metal-resin composite pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal-resin composite pipe improving flexibility, while maintaining sufficient pressure-proof strength and rigidity, even if a pipe wall is tinned, in the metal-resin composite pipe of arranging a metallic spiral reinforcing band plate on the pipe wall. <P>SOLUTION: This metal-resin composite pipe 1 is formed by forming the pipe wall 2 in a spiral waveform, and is formed by similarly arranging the reinforcing band plate 4 made of a metallic thin plate in a spiral shape in at least a crest part 31 of a spiral synthetic resin wall part 3 constituting the pipe wall 2 and both sidewall parts 32 continuing with the crest part 31. A single or a plurality of recessed strip parts 41 are arranged along a crest top part of the reinforcing band plate 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a metal-resin composite pipe mainly used for a protective pipe that protects by passing a power / communication cable such as a water pipe, a sewage (drainage) pipe, an electric wire or a telephone line, and more specifically, lightweight It relates to a metal-resin composite pipe having flexibility, excellent workability and economy, and having high pressure strength.

  Conventionally, this kind of metal resin composite tube has a tube wall made of synthetic resin formed in a spiral wave shape so that it can be handled easily when buried in the ground. Synthetic resin pipes that are supposed to have are widely used, but they must withstand strong earth pressure when buried underground, so the pipe walls must be thick and used for molding A large amount of synthetic resin material is required, resulting in an increase in material cost and a large weight, making it difficult to carry and embed.

  On the other hand, as what can reduce the wall thickness of a pipe wall, what has embed | buried the metal helical reinforcement strip | belt in the wall thickness of a pipe wall is proposed (refer patent documents 1-3), for example, patent In Document 1, an inter-wall is formed across the entire wall portion of the spiral corrugated crest forming the tube wall, both side walls connected to the crest, and the trough located on the tube axis side of the both side walls. There has been proposed a structure in which a reinforcing strip made of a thin metal plate is disposed on the synthetic resin material wall, and the reinforcing strip is superimposed on at least a part of the valley.

  However, in the case of embedding and forming such a metal reinforcing plate, the thickness of the tube wall can be reduced. The flexibility (flexibility) is impaired and the workability is reduced. In addition, when the synthetic resin wall is thinned, the strength and rigidity of the peak portion that is particularly susceptible to pressure and impact from the outside are not sufficient, and the risk of deformation and breakage increases.

Japanese Utility Model Publication No. 62-30080 Japanese Utility Model Publication No. 1-1123420 Japanese Utility Model Publication No. 1-123421

  Therefore, what the present invention intends to solve is that a metal resin composite pipe provided with a metal spiral reinforcing strip on the pipe wall can maintain sufficient compressive strength and rigidity even if the pipe wall is thinned. It is possible to provide a metal-resin composite tube that can be made flexible and can be improved.

  That is, the metal-resin composite pipe according to the present invention has a pipe wall formed in a spiral wave shape, and at least a peak part of the spiral synthetic resin wall part constituting the pipe wall and both side wall parts connected to the peak part. A metal-resin composite pipe in which a reinforcing strip made of a thin metal plate is similarly provided in a spiral shape, wherein one or a plurality of concave strips are provided along the peak of the reinforcing strip. It is.

  Here, the reinforcing band plate is provided with a synthetic resin coating layer, and is attached to at least the peak portion of the synthetic resin wall portion and the inner surface side of both side wall portions connected to the peak portion, It is preferable that the synthetic resin wall portion is closely attached to the outer surface.

  Moreover, what forms the recessed part of the shape along this concave part in the position corresponding to the said concave part of the peak part of the said synthetic resin wall part is preferable. Further, it is also preferable that the synthetic resin wall portion is provided with a crest portion so as to close the concave portion of the reinforcing band plate from the outside leaving a space.

  Furthermore, on the inner side surface of the portion of the synthetic resin wall portion where the reinforcing band plate including at least the valley portion between adjacent side edges of the reinforcing band plate does not exist, the synthetic resin belt body has both side edge portions. It is preferable that the adhesive plate is also spirally attached in a state where it abuts on both side edges of the adjacent reinforcing band plate or overlaps on both side edges of the reinforcing band plate.

  In addition, it is preferable that an inner tube wall is provided on the inner peripheral side of the spiral tube wall and the reinforcing strip is extended to a valley portion of the synthetic resin wall portion.

  Moreover, it is preferable that the said reinforcing strip is what cut | disconnected the laminated steel plate in strip shape. Further, on the inner side surface of the synthetic resin wall portion where the reinforcing band plate is not present between the adjacent side edges of the reinforcing band plate including at least the valley portion, the synthetic resin band member has both side edge portions. It is preferable that the adhesive plate is also spirally attached in a state where it abuts on both side edges of the adjacent reinforcing band plate or overlaps on both side edges of the reinforcing band plate.

  Further, it is preferable that a flat strip-shaped metal strip having a synthetic resin coating layer is provided between the peaks of the synthetic resin wall.

  According to the metal-resin composite pipe according to the present invention, since the single or plural concave portions are provided along the peak portion of the reinforcing strip corresponding to the peak portion of the tube wall, not only the overall pressure strength is improved. In particular, the strength and rigidity of the peaks that are susceptible to pressure and impact from the outside can be greatly improved by the presence of the recesses, which makes it possible to reduce the thickness compared to conventional metal-resin composite pipes. Thus, the flexibility of the entire pipe can be improved, and the weight and cost can be reduced.

  Further, the reinforcing band plate is provided with a synthetic resin coating layer, and is attached to at least the peak portion of the synthetic resin wall portion and the inner surface side of both side wall portions connected to the peak portion, Since the crests of the synthetic resin wall are in close contact with the outer surface, the reinforcing band plate and the synthetic resin wall can be easily and firmly connected by thermally fusing the resins together, efficiently and at low cost. A highly durable metal resin composite tube can be manufactured. Moreover, it can be used stably for a long period of time without causing rusting by accidentally scratching the surface of the reinforcing strip during construction.

  Furthermore, since the concave portion of the shape along the concave portion is formed at a position corresponding to the concave portion of the peak portion of the synthetic resin wall portion, the resin amount of the peak portion is suppressed and the weight is reduced and reduced. It is possible to further increase the strength due to the shape of the recessed portion while reducing the cost. In addition, since the ridge of the synthetic resin wall is provided so as to close the concave portion of the reinforcing band plate from the outside leaving a space, the dent does not appear on the outer surface of the ridge, and when it is torn at the site etc. It can prevent catching and breakage of the tube, and can improve work efficiency, and it can reduce the amount of resin in the ridge and reduce the weight and cost, while the ridge appearance has no dents or The beauty can be improved as few simple things.

  In addition, the synthetic resin strip is formed on the inner surface of the portion of the synthetic resin wall portion where the reinforcement strip including at least the valley between adjacent side edges of the reinforcement strip does not exist. The pressure resistance strength of the entire tube is made higher because it is also spirally attached in a state where it abuts on both side edges of the adjacent reinforcing band plate or overlaps on both side edges of the reinforcing band plate. It is possible to prevent the stripping of the reinforcing strip, the corrosion of the side edge portion of the reinforcing strip, and the damage caused by the catch of the electric wire. In addition, when cutting the pipe during manufacturing or construction, the reinforcing band plate at the cut portion is prevented from being separated from the synthetic resin wall, and burrs are less likely to occur at the cutting portion. The work related to cutting at the time is made easier and the workability is extremely high.

  Moreover, since the inner tube wall is provided on the inner peripheral side of the spiral tube wall and the reinforcing strip is extended to the valley of the synthetic resin wall portion, resistance when flowing fluid is eliminated, While being suitable as a water pipe or a sewer pipe, it is possible to make the pressure strength higher.

  Moreover, since the said reinforcement strip is what cut | disconnected the laminated steel plate in strip shape, a reinforcement strip can be manufactured efficiently. Further, since a flat strip-shaped metal strip having a synthetic resin coating layer is provided between the peaks of the synthetic resin wall, a tube having a simple structure and higher pressure resistance can be obtained.

  Next, based on FIGS. 1-11, the structure of the metal resin composite pipe | tube which concerns on embodiment of this invention is demonstrated in detail. 1 to 5 show a first embodiment of the present invention, and FIGS. 6 to 11 show a second embodiment. In the figure, reference numeral 1 denotes a metal resin composite pipe, 2 denotes a pipe wall, 3 denotes a synthetic resin wall, 4 Indicates a reinforcing band plate, and 5 indicates a synthetic resin band.

  In the following description of each embodiment, the pipe wall 2 is based on a pipe in which a substantially arc-shaped or trapezoidal crest 31 and trough 33 continuously wave through a side wall 32. Although an example in which the ridge portion 41 is provided with the ridge portion 41 will be described, the present invention is not limited to such a structure. For example, the ridge portion may have a substantially V shape, a substantially U shape, a polygonal shape, etc. Of course, a tube formed in a spiral wave shape in which a portion and a valley portion are continuous may be used. Further, the side wall portion 32 refers to a substantially linear connecting portion that gently connects the peak portion 31 and the valley portion 33.

  First, a first embodiment will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the metal resin composite tube 1 of the present invention has a tube wall 2 formed in a spiral wave shape, and a pile of helical synthetic resin wall portions 3 constituting the tube wall 2. The reinforcing strip 4 made of a metal thin plate is also provided in a spiral shape over the portion 31 and the side wall portions 32 that are continuous with the peak 31, and the peak 41 corresponding to the peak 31 of the reinforcing strip 4 is formed on the top 41. Along this, a concave line portion 41 is provided.

  The synthetic resin wall 3 is formed of a polyolefin resin such as polyethylene or polypropylene, or a synthetic resin such as vinyl chloride, but other synthetic rubbers or soft resins may be used. In addition, a reinforcing material such as a fiber material such as a thread, a woven fabric, a non-woven fabric, or a glass fiber, or a metal net is embedded in a portion of the synthetic resin wall 3 that is not particularly provided with a reinforcing strip. It may be reinforced.

  The synthetic resin wall portion 3 has a substantially constant thickness, and the crest portion 31 is similarly provided with a recessed portion 34 along the shape of the recessed strip portion 41 of the reinforcing band plate 4. By providing such a recessed portion 34, synergistically with the effect of the recessed strip portion 41 of the reinforcing strip 4, the pressure (earth pressure, etc.) applied to the mountain portion 31 is dispersed, and the strength and rigidity of the mountain portion 31 are increased. Needless to say, the pressure resistance of the metal resin composite tube 1 can be increased.

The reinforcing band plate 4 is formed by providing a synthetic resin coating layer 42 on the front and back of the thin metal plate 40, and as shown in FIG. 2, the peak portion 31 of the synthetic resin wall portion 3 and both sides connected to the peak portion 31 are provided. Attached to the wall portion 32 in a spiral manner from the inner surface in a close contact state. Here, the covering layer 42 of the reinforcing strip 4 is welded to the synthetic resin wall 3 and is firmly integrated. The material of the covering layer 42 is preferably composed of the same material as that of the synthetic resin wall portion 3 in terms of the degree of adhesion, but is not limited at all, and is preferably made of a polyolefin resin such as a polyethylene resin or a polypropylene resin. .
The metal thin plate 40 of the reinforcing band plate 4 may be, for example, a punching plate having a large number of small holes penetrating the plate surface or a metal plate without small holes. The material of the metal thin plate 40 may be a stainless thin plate or a steel thin plate. In addition, an iron plate may be used, and other metal thin plates may be used.

  The concave strip portion 41 of the reinforcing band plate 4 is formed by deforming the top of the mountain into a state of being bent in a substantially M shape in cross-sectional view. For example, it is good also as a shape dented in U shape or V shape.

When using the metal-resin composite pipe 1 of this embodiment as an underground pipe, it is performed by piping a planned piping site along a groove excavated to a required depth and covering the excavated soil thereon. In the disposed pipe, the reinforcing strip plate 4 having the concave strip portion 41 exhibits excellent pressure resistance against earth pressure.
In addition, when inserting an electric wire or the like into the pipe, the electric wire is supported only on the inner peripheral surface of the valley as in the conventional case, so the friction area between the inner peripheral surface and the electric wire is small, and the insertion work of the electric wire etc. Even if dew condensation occurs in the pipe, the dew water accumulates in the ridges below the pipe, so that it does not directly immerse the wires (cable covering, etc.) and protects it for a long time. The ability to do this is the same as before.

  In this embodiment, as shown in FIG. 3 (a), the reinforcing strip 4 having the concave portions 41 with respect to the synthetic resin wall portion molded body 30 having the concave portions 34 in a semi-cured state immediately after being extruded. Is continuously supplied in a spiral shape, and the reinforcing band plate 4 having an outer peripheral surface similarly curved in an M shape is bonded to the inner peripheral surface of the concave portion 34 curved in an M shape. While the crest portion 31 of the wall portion molded body 30 and the inner surface of the side wall portion 32 connected thereto and the coating layer 42 of the reinforcing strip 4 are welded and integrated with each other, both side edge portions of the molded body 30 are polymerized to sequentially spiral. At the same time, the synthetic resin strip 5 is continuously supplied from the inside, and wound and molded while adhering to the inner side surface including the valley portion 33 between the reinforcing strips 4. The reinforcing band plate 4 and the synthetic resin wall molded body 30 or the synthetic resin belt molded body 5 and the synthetic resin wall molded body 30 may be adhered by heating and melting with a heating device. Further, the reinforcing band plate 4 and the synthetic resin wall portion molded body 30 and further the synthetic resin band body 5 can be integrally formed by being spirally extruded, and the reinforcing band plate 4 or the like can be formed using an adhesive or the like. The synthetic resin strip 5 may be fixed to a predetermined portion of the tube wall 2. When the synthetic resin strip 5 is supplied spirally, as shown in FIG. 3 (a), both side edges adhere to the side edges of the adjacent reinforcing strips 4, 4. It is preferable to mold it. Moreover, as shown in FIG.3 (b), all the trough parts may be provided in one side of the synthetic resin wall part molded object 30, and you may shape | mold by the method similar to the above.

  In this example, the shape of the peak portion 31 of the synthetic resin wall portion 3 is formed in a substantially M shape like the reinforcing band plate 4, but as shown in FIGS. 4 (a) and 4 (b), the synthetic resin wall portion is formed. You may shape | mold the outer peripheral part corresponding to the groove part 41 of the 3 peak part 31 in a substantially flat state. Or you may bulge further outside and you may comprise in a curved shape. Thereby, a dent does not appear on the outer surface of the mountain portion, and it is possible to prevent catching at the time of drilling at the site or the like, breakage of the pipe due to this, and work efficiency can be improved. Moreover, as shown in FIG. 5, you may arrange two or more recessed strip parts 41 of the reinforcement strip 4 in parallel, and this can raise pressure-resistant intensity | strength more. Here, the synthetic resin wall 3 may be formed in a wave shape along the reinforcing band plate 4 as shown in (a) in the figure, or as shown in (b) in the figure. You may form the outer peripheral surface of the peak part 31 substantially flat. In addition, as shown in FIG. 5 (c), it is also a preferred embodiment to provide the peak portion 31 of the synthetic resin wall portion 3 so as to close the concave strip portion 41 of the reinforcing strip 4 from the outside leaving the space s. . This also prevents dents from appearing on the outer surface of the mountain, which can prevent catching and tearing when drilling at the site, etc., improving work efficiency, facilitating manufacturing and reducing costs. it can. In this case, the synthetic resin wall 3 is preferably made of a polyolefin resin such as polyethylene resin or polypropylene resin.

  Next, 2nd Embodiment is described based on FIGS.

  FIG. 6 is a front view of a metal resin composite pipe 1A according to the second embodiment, FIG. 7 (a) is a longitudinal sectional view, and FIG. 6 (b) is a partially enlarged view thereof. In this embodiment, as shown in FIGS. 6 and 7 (a) and 7 (b), the covering strip 4 is extended to the valley of the synthetic resin wall 3, and a straight synthetic resin is further provided on the inside thereof. The inner pipe 7 is provided. The inner pipe 7 makes it easy for fluid to flow inside, and can be suitable as, for example, a water pipe, a sewer pipe, or the like. The inner tube 7 is preferably made of the same material as the synthetic resin wall 3 in terms of adhesion, but is not limited at all. For example, what consists of polyolefin resin, such as a polyethylene resin and a polypropylene resin, is preferable.

  As shown in FIG. 8, a flat belt-shaped metal strip having a synthetic resin coating layer 61 on a metal plate or metal mesh strip 60 between adjacent crests 31, 31 of the synthetic resin wall 3. 6 may be handed over. Thereby, the strength of the tube itself can be easily increased at low cost. Further, as shown in FIGS. 9 and 10 (a) and 10 (b), the outer peripheral surface of the mountain portion 31 of the synthetic resin wall portion 3 may be molded into a flat state, as in the first embodiment. There is no dent on the outer surface of the mountain, so that it can be prevented from being caught or torn when it is used at the site, and work efficiency can be improved.

  Furthermore, in this example, the inner tube 7 is formed in a straight shape (substantially right cylindrical shape), but the inner wall does not necessarily have to be a straight shape, and may have, for example, a slight uneven waveform. Further, instead of providing the straight inner pipe 7, as shown in FIG. 11, a flat strip-shaped synthetic resin inner reinforcing plate 8 may be spirally attached only inside the valley portion 33. As a result, while maintaining high pressure strength, it can be more flexible, reduce the amount of raw materials used, such as synthetic resin, and light weight, so manufacturing surface, transportation surface, construction surface, etc. Is more advantageous.

  12 (a) and 12 (b) are similar to those shown in FIG. 5 (c) in the first embodiment, the ridges 31 of the synthetic resin wall 3 and the concave strips 41 of the reinforcing strip 4 are used. In this embodiment, the space s is left so as to be closed from the outside. This also prevents dents from appearing on the outer surface of the mountain, which can prevent catching and tearing when drilling at the site, etc., improving work efficiency, facilitating manufacturing and reducing costs. The synthetic resin wall 3 is preferably made of a polyolefin resin such as polyethylene resin or polypropylene resin. In addition, as shown in FIG.12 (b), although the peak part 31 may be a thing of the form bridge | crossed straightly so that the recessed part 41 may be plugged up, as shown in FIG. The contact area may be increased and the space s may be reduced to increase the strength. The same can be said about such strength increase also in the case of FIG. Further, in the form in which the mountain portion 31 is provided so as to be closed from the outside while maintaining the space s with respect to the concave portion 41 as described above, a flat belt-like shape is used instead of the straight inner tube 7 as shown in FIG. You may comprise so that the synthetic resin inner side reinforcement board 8 may be attached only inside the trough part 33 helically.

  About another structure, it is the same as that of the said 1st Embodiment, About the same structure, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

The front view which shows the metal resin composite pipe | tube which concerns on 1st Embodiment of this invention. It is explanatory drawing which similarly shows a metal resin composite pipe | tube, (a) is a longitudinal cross-sectional view, (b) is the elements on larger scale of (a). It is explanatory drawing which shows the manufacturing method of the metal resin composite pipe | tube which concerns on 1st Embodiment of this invention, (a) is sectional drawing, (b) is sectional drawing which shows another manufacturing method. It is explanatory drawing which similarly shows the modification of a metal resin composite pipe | tube, (a) is a longitudinal cross-sectional view, (b) is the elements on larger scale of (a). It is explanatory drawing which similarly shows the other modification of a metal resin composite pipe | tube, (a), (b) is a cross-sectional partial enlarged view which shows a modification, respectively, (c) is a cross-sectional partial enlarged view which shows another modification. . The front view which shows the metal resin composite pipe | tube which concerns on 2nd Embodiment of this invention. It is explanatory drawing which similarly shows a metal resin composite pipe | tube, (a) is a longitudinal cross-sectional view, (b) is the elements on larger scale of (a). The cross-section part enlarged view which similarly shows the modification of a metal resin composite pipe. The front view which similarly shows the other modification of a metal resin composite pipe. It is explanatory drawing which similarly shows the other modification of a metal resin composite pipe | tube, (a) is a longitudinal cross-sectional view, (b) is the elements on larger scale of (a). The cross-section part enlarged view which shows the other modification of a metal resin composite pipe | tube similarly. Similarly, it is explanatory drawing which shows the other modification of a metal resin composite pipe | tube, (a) is a longitudinal cross-sectional view, (b) is the elements on larger scale of (a). The cross-section part enlarged view which shows the other modification of a metal resin composite pipe | tube similarly. The cross-section part enlarged view which shows the other modification of a metal resin composite pipe | tube similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal resin composite pipe 2 Pipe wall 3 Synthetic resin wall part 4 Reinforcement strip 5 Synthetic resin strip 6 Metal strip 7 Inner tube 8 Inner reinforcement plate 30 Synthetic resin wall molding 31 Peak 32 Side wall 33 Valley Part 34 concave part 40 metal thin plate 41 concave strip part 42 coating layer 43 mountain peak part 60 metal net 61 61 coating layer s space

Claims (8)

  The tube wall is formed in a spiral wave shape, and at least the peak portion of the spiral synthetic resin wall portion constituting the tube wall and both side wall portions connected to the peak portion are also spiraled with a reinforcing strip made of a metal thin plate. A metal resin composite pipe provided in a shape, wherein a single or a plurality of concave strips are provided along a peak portion of the reinforcing strip.   The reinforcing band plate is provided with a synthetic resin coating layer, and is attached to at least the mountain portion of the synthetic resin wall portion and the inner surface side of both side wall portions connected to the mountain portion, on the outer surface of the concave strip portion. The metal resin composite pipe according to claim 1, wherein the crests of the synthetic resin wall are in close contact.   The metal resin composite pipe according to claim 1 or 2, wherein a concave portion having a shape along the concave stripe portion is formed at a position corresponding to the concave stripe portion of the peak portion of the synthetic resin wall portion.   The metal resin composite pipe according to claim 1 or 2, wherein the peak portion of the synthetic resin wall portion is provided so as to close the concave portion of the reinforcing band plate from outside while leaving a space.   Of the synthetic resin wall portion, the synthetic resin strip is adjacent to the inner surface of the portion where the reinforcing strip including at least the valley between adjacent side edges of the reinforcing strip is not present. The metal resin according to any one of claims 2 to 4, wherein the metal resin is also spirally attached in a state of being in contact with both side edges of the reinforcing band plate or being overlapped on both side edges of the reinforcing band plate. Composite tube.   The inner tube wall is provided on the inner peripheral side of the spiral tube wall, and the reinforcing strip is extended to a valley portion of the synthetic resin wall portion. Metal resin composite tube.   The metal-resin composite pipe according to any one of claims 1 to 6, wherein the reinforcing strip is obtained by cutting a laminated steel plate into a strip shape.   The metal resin composite according to any one of claims 1 to 7, wherein a flat strip-shaped metal strip having a synthetic resin coating layer is provided between the peaks of the synthetic resin wall.

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