JP2013036575A - Fluid transporting flexible tube and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid transporting flexible tube which is excellent in flexibility and long-term reliability without degradation in strength of an axial force reinforced layer and is lightweight, and further provide a method for manufacturing the same.SOLUTION: In the fluid transporting flexible tube, a resin layer 5 is provided on an outer periphery of an interlock tube 3. An inner-pressure resistance reinforced layer 9 is provided on the periphery of the resin layer 5. An axial force reinforcing layer 10 is provided on the periphery of the inner-pressure resistance reinforced layer 9. The reinforcing strip making up of the axial force reinforcing layer 10 is made of fiber reinforced plastic. A water shielding layer 11 is provided on the periphery of the axial force reinforcing layer 10. The water shielding layer 11 is formed by winding double-layered tape around itself. The water shielding layer 11 prevents water that entered from the outside from permeating the axial force reinforcing layer 10 inside. A protective layer 13 is provided on the periphery of the water shielding layer 11. The double-layered tape 17 is composed of a metallic layer 19 and a resin coated layer 21. The metallic layer 19 is inserted into the resin coated layer 21. The metallic layer 19 is undulate in section.

Description

  The present invention relates to a fluid transport flexible tube for transporting oil and gas produced from a submarine oil and gas field and the like, and a method for manufacturing a fluid transport flexible tube.

  Conventionally, high-pressure oil and gas produced from a subsea oil and gas field are transported to a floating oil production facility by a flexible pipe for fluid transportation. The flexible tube is required to have internal pressure resistance, liquid tightness, waterproofness, and the like.

  As such a flexible pipe for transporting fluid, for example, a stainless steel interlock pipe excellent in flexibility and excellent in external pressure resistance and lateral pressure resistance during laying is used in the innermost layer, and an oil A plastic inner pipe with excellent gas and liquid tightness is provided, and a metal internal pressure reinforcement layer as an internal pressure reinforcement and a metal axial force reinforcement layer as an axial reinforcement are provided on the outer periphery, and the outermost layer is provided as an outer layer. A plastic sheath is provided as a waterproof layer (Patent Document 1).

JP 7-156285 A

  However, the flexible fluid transport pipe as in Patent Document 1 is provided with a metal axial force reinforcement layer as axial reinforcement, but it is possible to increase the length when oil gas is pumped from a deeper seabed. It is necessary to use a flexible fluid transport pipe. For this reason, the weight of the whole transport pipe increases. Therefore, axial force reinforcement that can withstand this weight is required. In order to obtain such higher axial force reinforcement, it is necessary to use a metal having higher strength or to increase the thickness of the axial force reinforcement layer.

  However, the use of a high-strength metal leads to an increase in cost, and increasing the thickness of the axial force reinforcing layer further increases the weight of the transport pipe. For this reason, a lighter and higher strength axial force reinforcing means is desired.

  On the other hand, there is a method in which the reinforcing strip is made of resin such as fiber reinforced plastic (FRP) to achieve necessary axial force and weight reduction. By using the resin reinforcing strips, it is possible to achieve weight reduction as compared to conventional metal reinforcing strips, and further, anticorrosion is unnecessary, so that a large lightening effect can be expected.

  However, the inventors have found that the strength of the reinforcing strip made of resin is reduced by moisture that permeates the protective layer. That is, it is lightweight. There is a demand for a flexible tube for fluid transportation that does not have a decrease in strength of the reinforcing strip (axial force reinforcing layer) and has excellent long-term reliability.

  The present invention has been made in view of such problems, and is a flexible tube for fluid transportation and fluid transportation that is excellent in flexibility, lightweight, and excellent in long-term reliability without deterioration in strength of the axial force reinforcing layer. It aims at providing the manufacturing method of a flexible tube.

  In order to achieve the above-described object, the first invention includes a resin layer provided on the outer peripheral side of the interlock pipe, an internal pressure-resistant reinforcing layer provided on the outer peripheral side of the resin layer, and the internal pressure-resistant reinforcing layer. At least an axial force reinforcing layer provided on the outer peripheral side, a water shielding layer provided on the outer peripheral side of the axial force reinforcing layer, and a protective layer provided on the outer peripheral side of the water shielding layer, The axial force reinforcing layer is made of fiber reinforced plastic, and the water shielding layer is formed of a multilayer tape in which a metal layer is sandwiched between resins, and the metal layer is at least partially in a cross section of the multilayer tape. The flexible tube for transporting fluid, which has a wave shape and can prevent the water constituting the axial force reinforcing layer from being deteriorated by the water passing through the protective layer.

  In the plane of the multilayer tape, a wave crest in the corrugated shape of the metal layer is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape, and the corrugated shape of the metal layer is the multilayer In the plane of the tape, it may be formed in two different directions, and wave-shaped peaks or valleys may be formed in a lattice shape.

  Here, in the present invention, the ridges or valleys are formed in a grid-like position, and the ridges or valleys are periodically and repeatedly formed in two different directions, with the result that the centers of the peaks or valleys are formed. Is arranged so as to be at each lattice point position of the periodic structure. In this case, the thickness of the metal layer is not constant, and the arrangement of irregularities accompanying the change in thickness is naturally included in the “lattice arrangement”, and the so-called embossed shape is also included in the “lattice arrangement”.

  As the resin used for the water shielding layer, polyolefin resin materials such as polypropylene, polyethylene, butyl rubber, polyethylene terephthalate, tetrafluoroethylene / hexafluoropropylene copolymer resin, polytetrafluoroethylene, Fluorine resin materials such as polyvinylidene fluoride-hexafluoropropylene, polyvinyl fluoride, polychlorotrifluoroethylene, and polyvinylidene fluoride are more desirable, or hydrochloric acid rubber, polyamide, epoxy resin, polystyrene, styrene copolymer resin, polyformaldehyde , Polyvinyl chloride, acetylcellulose, ethylcellulose, polybutadiene, acrylonitrile-butadiene copolymer, polycarbonate, polyurethane, chlorosulfonated polyethylene, polychloropropylene Emissions, natural rubber, silicone rubber, a resin material such as polyvinyl alcohol is desirable. Further, it is possible to improve the water shielding performance by modifying the resin material with maleic anhydride or the like to improve adhesiveness. In the present invention, the provision of the water shielding layer can extend the life of the axial force reinforcing layer.

  The angle formed between the longitudinal direction of the multilayer tape and the wave crest portion of the corrugated shape of the metal layer substantially coincides with the winding angle of the multilayer tape with respect to the circumferential direction of the flexible tube for fluid transportation, and the multilayer tape It is desirable that the extending direction of the wave crest is substantially coincident with the circumferential direction of the fluid transport flexible tube.

  As the resin constituting the protective layer, polyolefin resin and polyamide resin (polyamide 11, polyamide 12, etc.) can be used. The resin part of the multilayer tape has compatibility with the protective layer. The resin may have a lower melting point than the protective layer. Alternatively, at least the surface of the multilayer tape may be made of a rubber material, and the rubber material may be in close contact with the protective layer.

  The multilayer tape is spirally wound around the flexible tube for fluid transportation so that the end portions in the width direction do not overlap each other, and covers the gap between the multilayer tapes on the inner layer side, Two or more layers of the multilayer tape may be wound, and the multilayer tape is spirally wound around the flexible tube for fluid transportation so that the widthwise ends of the multilayer tape wrap around each other. Also good.

  In addition, the multilayer tape is wound so that the longitudinal direction thereof substantially coincides with the axial direction of the fluid transport flexible tube, and the width direction of the multilayer tape is the circumferential direction of the fluid transport flexible tube, The lap portion of the multilayer tape may be formed so as to extend in the axial direction of the fluid transport flexible tube.

  According to the first invention, since the reinforcing strip is made of fiber reinforced plastic, a necessary axial force can be ensured, and weight reduction can be achieved as compared with the metallic reinforcing strip. Further, a water shielding layer is provided between the axial force reinforcing layer and the protective layer, and the water shielding layer is constituted by a laminated film in which a metal film is sandwiched between resin films. For this reason, the penetration | invasion of the water | moisture content from the outside can be shielded reliably. Therefore, there is no strength deterioration of the reinforcing strip due to moisture.

  Further, since the metal layer is sandwiched between the resins, the metal layer is not torn or bent when the water shielding layer is constructed. For this reason, a water shielding layer can be constructed reliably. Furthermore, the metal layer does not damage the internal reinforcing layer, and it is possible to prevent a decrease in strength due to wear or fatigue of the metal layer or a decrease in strength of the reinforcing layer.

  In addition, since the metal layer has a wave shape in the cross section of the multilayer tape, the multilayer tape (metal layer) can be deformed in the waveform direction in a state where the multilayer tape is wound. For this reason, it can suppress that a multilayer tape becomes a hindrance of a deformation | transformation with respect to the flexibility of the flexible tube for fluid transportation in the state by which the multilayer tape was wound.

  In addition, if the corrugated shape of the metal layer is formed in two different directions in the plane of the multilayer tape, and the corrugated peaks or valleys are formed in a lattice shape, the multilayer tape is used for fluid transportation. The flexibility of the flexible tube can follow any direction of deformation.

  Further, the corrugated crest portion of the metal layer is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape, and the angle formed by the longitudinal direction of the multilayer tape and the corrugated portion of the corrugated shape of the metal layer is used for fluid transportation. By substantially matching the winding angle of the multilayer tape with respect to the circumferential direction of the flexible tube, the extending direction of the wave crest when the multilayer tape is wound is substantially matched with the circumferential direction of the fluid-transporting flexible tube. be able to. As a result, the traveling direction of the wave shape can be the tube axis direction. For this reason, the multi-layer tape (metal layer) has a large deformability with respect to the deformation direction (the axial direction of the fluid transport flexible tube) during bending of the fluid transport flexible tube, ensuring high flexibility can do. In addition, since the stress in the tube axis direction during deformation can be relieved by the wave shape, the fatigue life of the multilayer tape is also improved.

  In addition, as the resin constituting the protective layer, polyolefin resin, polyamide resin (polyamide 11, polyamide 12, etc.) can be used, but the resin constituting the water shielding layer has compatibility with the protective layer, If a material having a melting point lower than that of the protective layer is used, when the protective layer is extruded and coated, the protective layer and the resin part are integrated by thermal fusion, and there is no deviation from the mechanical history of bending and twisting. There is no worry.

  Also, the surface of the multilayer tape and the protective layer can be bonded, but at least the surface of the multilayer tape is composed of a rubber material, and the multilayer tape and the protective layer are adhered by closely contacting the rubber material and the protective layer. Adhesion between the two becomes unnecessary. Therefore, when the flexible tube is used for a long period of time, it is possible to prevent the adhesive from deteriorating and forming a gap between the multilayer tape and the protective layer.

  The metal layer can have high long-term durability by using a material having excellent surface corrosion resistance such as stainless steel, aluminum, and clad steel.

  According to a second aspect of the present invention, a flexible interlock pipe is fed in the tube axis direction, a resin layer is formed on the outer peripheral side of the interlock pipe, an internal pressure-proof reinforcing layer is provided on the outer peripheral side of the resin layer, An axial force reinforcing layer is formed on the outer peripheral portion of the internal pressure-proof reinforcing layer, a water shielding layer is formed on the outer peripheral side of the axial force reinforcing layer, and a protective layer is extrusion coated on the outer periphery of the water shielding layer. A method of manufacturing a flexible tube, wherein the water shielding layer is formed by a multilayer tape in which a metal layer is sandwiched with a resin, and the metal layer is at least partially corrugated in a cross section of the multilayer tape. In the plane of the multilayer tape, the wave crest forming direction of the metal layer is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape, and the longitudinal direction of the multilayer tape Formed by the formation direction of the wave crest in the wave shape of the metal layer The winding angle of the multilayer tape with respect to the circumferential direction of the fluid-transporting flexible tube is substantially matched, and the stretching direction of the wave crest is substantially matched with the circumferential direction of the fluid-transporting flexible tube. A method for producing a flexible tube for transporting fluid, characterized in that the water shielding layer is formed by winding a layer tape.

  The corrugated shape of the metal layer is preferably formed in two different directions on the plane of the multilayer tape, and the corrugated peaks or troughs are preferably formed in a lattice shape.

  The multilayer tape is spirally wound around the flexible tube for fluid transportation so that the end portions in the width direction do not overlap each other, and covers the gap between the multilayer tapes on the inner layer side, Two or more multilayer tapes may be wound.

  The multilayer tape may be spirally wound around the flexible tube for fluid transportation such that end portions in the width direction of the multilayer tape wrap around each other.

  The multilayer tape is wound so that the longitudinal direction of the multilayer tape substantially coincides with the axial direction of the fluid transport flexible tube, and the width direction of the multilayer tape is the circumferential direction of the fluid transport flexible tube. The lap portion of the layer tape may be stretched in the axial direction of the fluid transport flexible tube.

  According to the second invention, since the reinforcing strip is formed of resin, a lightweight flexible pipe for fluid transportation can be obtained. In addition, since a water shielding layer made of a multilayer tape in which a metal layer is sandwiched between resins is provided on the inner peripheral side of the protective layer, it is possible to reliably prevent moisture from entering from the outside. In addition, since the metal layer has a wave shape in the cross section of the multilayer tape, the multilayer tape (metal layer) can be stretched and deformed in the wave shape direction when the multilayer tape is wound.

  Further, the corrugated crest portion of the metal layer is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape, and the angle formed by the longitudinal direction of the multilayer tape and the corrugated portion of the corrugated shape of the metal layer is used for fluid transportation. Since the winding angle of the multilayer tape with respect to the circumferential direction of the flexible tube substantially matches, the stretching direction of the wave crest in the state where the multilayer tape is wound substantially matches the circumferential direction of the flexible tube for fluid transportation, It is possible to ensure high flexibility that the multilayer tape (metal layer) can follow the deformation direction (the axial direction of the fluid transport flexible tube) during bending of the fluid transport flexible tube.

  In addition, if multiple layers of tape are wound spirally so that the end portions in the width direction of each other do not wrap, and wound so that the gaps between the upper and lower layers of the multilayer tape are filled with each other, water can surely enter. Can be prevented. At this time, the winding direction of the multilayer tape may be spirally wound in the same direction or may be spirally wound in the opposite direction. If it does in this way, the crevice between the tapes wound spirally can be almost made up.

  In addition, if the multilayer tape is wound in a spiral shape so that the end portions in the width direction are wrapped, the entry of water can be reliably prevented by forming the wrap portion.

  Also, the multilayer tape is wound so that the longitudinal direction of the multilayer tape is substantially coincident with the axial direction of the fluid transport flexible tube and the width direction of the multilayer tape is the circumferential direction of the fluid transport flexible tube. Intrusion of water can be reliably prevented by wrapping the ends of the wound portions.

  According to the present invention, there are provided a flexible tube for fluid transportation that is excellent in flexibility, is light in weight, and has excellent long-term reliability with no reduction in the strength of the axial force reinforcing layer, and a method for manufacturing the flexible tube for fluid transportation. Can do.

It is a figure which shows the flexible tube 1, (a) is a perspective view, (b) is sectional drawing. It is a figure which shows the structure of the multilayer tape 17, (a) is a perspective view, (b) is sectional drawing, A arrow direction view of (a). It is a figure which shows arrangement | positioning of the crest part of the multilayer tape 17, (a) is a top view, (b) is the BB sectional drawing of (a), (c) is CC sectional view of (a). The figure, (d) is the DD sectional view taken on the line of (a). It is a figure which shows the winding method of the multilayer tape 17, (a) is a general view, (b) is the E section enlarged view of (a). The figure which shows the winding state which wound the multilayer tape 17 helically. The figure which shows the structure of the multilayer tape 17a. The figure which shows the winding state which wound the multilayer tape 17 vertically. The figure which shows the winding state which wound the multilayer tape 17 vertically. It is a perspective view of the resin coating layer which shows the multilayer tape 17b, (a) is a perspective view, (b) is a top view. The figure which shows the deformation | transformation state of the multilayer tape 17. FIG. The figure which shows the effect of the water shielding layer. The figure which shows other embodiment of a multilayer tape. Sectional drawing which shows the flexible tubes 1a and 1b.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1A and 1B are diagrams showing a flexible tube 1, in which FIG. 1A is a perspective view and FIG. 1B is a cross-sectional view. The flexible tube 1 includes an interlock tube 3, which is mainly a tubular body, a resin layer 5, an internal pressure-resistant reinforcing layer 9, an axial force reinforcing layer 10, a water shielding layer 11, a protective layer 13, and seat floor layers 15a, 15b, 15c. , 15d, etc.

  The interlock pipe 3 is located in the innermost layer of the flexible pipe 1 and is made of stainless steel having excellent buckling strength against external pressure and good corrosion resistance. The interlock pipe 3 is formed by forming a tape into a S-shaped cross section and meshing and connecting with each other at the S-shaped portion, and has flexibility. Instead of the interlock pipe 3, any other form of pipe can be used as long as it has the same flexibility and excellent buckling strength.

  A resin layer 5 is provided on the outer peripheral side of the interlock pipe 3. The resin layer 5 shields the fluid flowing through the interlock pipe 3. As the resin layer 5, for example, nylon or polyvinyldenfluoride (PVDF) that can withstand high temperatures of 90 ° C. or more and has excellent oil resistance can be used.

  In addition, the outer peripheral side of the interlock pipe 3 means the outer side of the interlock pipe 3 in a cross section, and includes that there is another layer structure between the interlock pipe 3 and the resin layer 5. . In the following description, in the positional relationship of each layer, it is simply referred to as “periphery”, but it is needless to say that similarly, those having other layer structures between the respective layers are included.

  For example, a floor layer 15a is provided between the interlock pipe 3 and the resin layer 5 as necessary. The floor layer 15a is a layer for leveling the uneven shape on the outer periphery of the interlock pipe 3 and can be deformed following the flexibility of the interlock pipe 3. That is, the floor layer 15a has a certain thickness, such as a non-woven fabric, and serves as an uneven cushion on the outer periphery of the interlock tube 3.

  Note that the floor layer is provided as necessary, and in the following description, a case where the floor layer is provided will be described, but it is not always necessary and can be omitted. Accordingly, the illustration of the floor layer is omitted in the following drawings.

  On the outer periphery of the resin layer 5, an internal pressure-resistant layer 9 is provided. The internal pressure-resistant reinforcing layer 9 is a reinforcing layer against the internal pressure of the fluid flowing mainly in the interlock pipe 3. The internal pressure-proof reinforcing layer 9 is formed, for example, by winding metal tapes having a cross-sectional C shape or a cross-sectional Z shape so as to face each other and to overlap each other in the axial direction. The internal pressure proof reinforcing layer 9 has a configuration in which a metal tape is wound at a predetermined pitch as described above, and can follow bending deformation and torsional deformation of the interlock pipe 3.

  An axial force reinforcing layer 10 is provided on the outer periphery of the internal pressure-resistant reinforcing layer 9. The axial force reinforcing layer 10 is a reinforcing layer for mainly suppressing the interlock pipe 3 from being deformed (extended) in the axial direction of the flexible pipe 1. The axial force reinforcing layer 10 is formed by alternately winding two reinforcing strips having a flat cross-sectional shape at a long pitch (so that the winding pitch is sufficiently long with respect to the width of the reinforcing strip). A plurality of reinforcing strips are arranged in the circumferential direction on the outer periphery of the internal pressure-proof reinforcing layer, and are wound at a long pitch. The axial force reinforcing layer 10 can be deformed following the flexibility of the interlock 3.

  The reinforcing strip constituting the axial force reinforcing layer 10 is made of fiber reinforced plastic. As the high-strength fiber constituting the reinforcing strip, for example, an aramid fiber or carbon fiber having a thickness of about 0.1 mm to 1.0 mm is used. A polyolefin resin is used as the matrix resin constituting the reinforcing strip.

  In addition, you may provide the floor layer 15b which is the resin tape made from polyethylene between the internal pressure-proof reinforcement layer 9 and the axial force reinforcement layer 10 as needed. Further, a floor layer 15c, which is a polyethylene resin tape, may be provided between two layers of reinforcing strips that are spirally wound in opposite directions. The resin tape used for the floor layer may be made of a resin material other than polyethylene as long as the strength and corrosion resistance are equivalent. The floor layers 15b and 15c prevent the reinforcing members from being worn by rubbing when the reinforcing members follow the deformation of the flexible tube 1. Even in this case, it is said that the axial force reinforcing layer 10 is provided on the outer peripheral side of the internal pressure resistant reinforcing layer 9 regardless of the presence or absence of the floor layer. In the following, unless otherwise specified, the internal pressure-proof reinforcing layer 9 and the axial force reinforcing layer 10 are collectively referred to as a reinforcing layer.

  A floor layer 15 d is provided on the outer periphery of the axial force reinforcing layer 10 as necessary. The floor layer 15 d is a layer for leveling the uneven shape on the outer periphery of the axial force reinforcing layer 10 and can be deformed following the flexibility of the interlock pipe 3. Since the floor layer 15d has the same configuration as the floor layer 15a, description thereof is omitted.

  A water shielding layer 11 is provided on the outer periphery of the floor layer 15d. The water shielding layer 11 is formed by winding a multilayer tape. The water-impervious layer 11 prevents water that has entered from the outside from passing through the internal axial force reinforcing layer 10. The structure and winding method of the multilayer tape will be described later.

  A protective layer 13 is provided on the outer periphery of the water shielding layer 11. The protective layer 13 is for protecting each internal layer. The protective layer 13 can be made of, for example, non-crosslinked resin made of nylon, polyethylene, polyarylate resin or polyamide synthetic resin. As described above, each layer constituting the flexible tube 1 follows the bending deformation or torsional deformation of the flexible tube 1 and has flexibility.

  The flexible tube 1 is manufactured as follows. The interlock pipe 3 manufactured in advance is sent in the axial direction, and a floor tape is wound around the interlock pipe 3 as necessary to form the floor layer 15a. The interlock pipe 3 on which the floor layer 15a is formed is sent to the extruder, and the extruder pushes the resin to the outer peripheral portion to form the resin layer 5.

  Further, a reinforcing layer is formed on the outer peripheral side of the resin layer 5 by a reinforcing tape winding machine. Further, a multilayer tape manufactured in advance is supplied from the multilayer tape feeder. The multilayer tape is spirally wound, or is supplied so that the longitudinal direction of the multilayer tape is substantially the same as the axial direction of the interlock pipe 3, is formed in a forming machine, and is longitudinally wound. . Thus, the water shielding layer 11 is formed. The feed speed from the feeder of the multilayer tape is superimposed on the extrusion speed of the interlock pipe 3 with the winding speed when the pipe is considered to be stationary in both cases of spiral winding and longitudinal winding in the axial direction. It is necessary to send out at the speed.

  Further, a protective layer 13 is formed on the outermost peripheral portion by an extruder and wound up to a predetermined length. Thus, the flexible tube 1 is manufactured.

  Next, the multilayer tape 17 which comprises the water shielding layer 11 is demonstrated. 2 is a view showing the multilayer tape 17, FIG. 2 (a) is a perspective view, FIG. 2 (b) is a view in the direction of arrow A in FIG. 2 (a), and a sectional view of the multilayer tape 17. is there. The multilayer tape 17 includes a metal layer 19 and a resin coating portion 21. The metal layer 19 is sandwiched between the resin coating portions 21.

  The metal layer 19 may be thin on the film and easily processed, and may be excellent in corrosion resistance. For example, stainless steel, aluminum, clad steel clad with a material having good corrosion resistance on the outer surface, or the like can be used. The metal layer 19 has a thickness of about 0.05 mm, for example, and the multilayer tape 17 as a whole may be about 0.2 to 0.3 mm, for example.

  The resin coating portion 21 is a resin member and can prevent the metal layer 19 from being bent, torn, or wrinkled when the water shielding layer 11 is constructed. The material of the resin coating portion 21 will be described later.

  As shown in FIG. 2B, the metal layer 19 has a wave shape in the cross section. Such a metal layer 19 may be formed by extrusion-coating a resin on a corrugated metal film, or may be installed in a corresponding mold to integrate the resin by injection. Alternatively, a resin member having a corrugated shape and a metal film, which are separately formed, may be integrated by a known technique such as adhesion or pressure bonding. Moreover, a metal layer can also be formed by vapor deposition etc. on the resin member by which the surface was previously formed in the waveform.

  Here, the metal layer 19 has a wave shape having a crest and a trough, and the crest (or trough) is referred to as a crest 23. That is, in the cross-sectional example shown in FIG. 2B, there are five crest portions 23 on the mountain side (upper side).

  3A is a plan view of the multilayer tape 17, FIG. 3B is a cross-sectional view taken along line BB in FIG. 3A, and FIG. 3C is a cross-sectional view taken along line C- in FIG. C line sectional drawing, FIG.3 (d) is a figure which shows DD line sectional drawing of Fig.3 (a). The dotted line in the figure represents the position of the wave crest 23. The wave crest 23 is continuously formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape 17. That is, in the example of FIG. 3A, the wave crest 23 is formed obliquely by an angle K with respect to the longitudinal direction of the multilayer tape 17.

  Accordingly, the wave shape differs depending on the cross-sectional position. For example, the wave crest portion 23 at the left end in FIG. 3B continuously shifts in the right direction in the figure as it goes to FIGS. 3C and 3D. It is formed.

  Next, a method for winding the multilayer tape 17 will be described. 4A is a view showing a method of spirally winding the multilayer tape 17 around the outer periphery of the axial force reinforcing layer 10 (the floor layer 15d), and FIG. 4B is an E portion of FIG. 4A. It is an enlarged view. For example, as shown in FIG. 4A, the multilayer tape 17 is wound in a spiral shape (in the direction of arrow F in the figure). For example, after a reinforcing strip (a floor tape) is supplied to form the axial force reinforcing layer 10 (a floor layer 15d), the multilayer tape 17 is supplied and wound.

  FIG. 5 is a cross-sectional view in the axial direction showing a state in which the multilayer tape 17 is wound around the outer periphery of the axial force reinforcing layer 10. As shown in FIG. 5 (a), the multilayer tape 17 has a small gap so that the end portions in the width direction of the multilayer tape 17 do not overlap each other (so as not to wrap). The multi-layer tape 17 may be wound around the outer periphery, and the multi-layer tape 17 may be wound around the upper layer (outer layer) in the same manner by shifting the winding position so as to cover the gap between the lower layer (inner layer) multi-layer tape 17. As for the winding of the multilayer tape, it is preferable to wind the lower layer (inner layer) tape and the upper layer (outer layer) tape in opposite directions because the tension applied to the interlock pipe at the time of winding is balanced, so that winding is easy.

  Further, as shown in FIG. 5B, the multilayer tape 17 may be wrapped and wrapped so that the end portions in the width direction of the multilayer tape 17 overlap each other. Even if it winds by any method of FIG. 5, the multilayer tape 17 can be wound without a gap in a water shielding layer. The multilayer tape 17 and the floor layer 15d may be integrated by adhesion, fusion, or the like.

  Note that the melting point of the resin coating portion 21 constituting the water shielding layer 11 is lower than the melting point of the resin constituting the protective layer 13, and the resin constituting the resin coating portion 21 and the resin constituting the protective layer 13 are in phase. It may have solubility. If the resin coating part 21 and the protective layer 13 are compatible and the melting point of the resin coating part 21 is lower than the melting point of the protective layer 13, the protective layer 13 and the multilayer are extruded when the resin of the protective layer 13 is extruded. It is easy to integrate the tape 17 with each other. For this reason, when the protective layer 13 is formed, a shift or the like does not occur between the water shielding layer 11 and the protective layer 13.

  As a material having such a relationship, the resin coating portion 21 may be made of nylon 12, for example, and the protective layer 13 may be made of nylon 11. Alternatively, the resin coating portion may be low density polyethylene (LDPE) and the protective layer 13 may be high density polyethylene (HDPE).

  Moreover, the resin coating | coated part 21 (surface) can also be comprised with rubber materials (For example, ethylene rubber, ethylene propylene rubber, silicon rubber, urethane rubber, butyl rubber etc.). By doing in this way, the friction coefficient of the protective layer 13 and the resin coating part 21 (multilayer tape 17) becomes large. For this reason, the protective layer 13 and the multilayer tape 17 do not come into close contact with each other.

  In addition, when the resin coating part 21 whole is made of a rubber material, there is a possibility that the adhesiveness with the metal layer 19 is inferior. For this reason, as shown in FIG. 6, it is good also considering the resin coating part 21 as a multilayer. That is, in the multilayer tape 17a shown in FIG. 6, the resin covering portion 21 is provided with a resin layer excellent in adhesiveness with the metal layer 19 in the inner layer, and the rubber portion 21a is formed only with the outer layer by a rubber material. Also good.

  As shown in FIG. 4B, in the front view (or plan view) of the flexible tube, in a state where the multilayer tape 17 is spirally wound around the outer periphery of the axial force reinforcing layer 10 (the floor layer 15d). The axial direction H of the flexible tube is perpendicular to the circumferential direction G of the flexible tube. The angle formed by the winding direction I of the multilayer tape 17 with respect to the circumferential direction G of the flexible tube is J. Further, as described above, the angle formed by the longitudinal direction I of the multilayer tape 17 and the wave crest 23 is K. Here, the winding direction I of the multilayer tape 17 coincides with the longitudinal direction of the multilayer tape 17.

  Therefore, the angle J formed by the winding direction I of the multilayer tape 17 and the circumferential direction G of the flexible tube and the angle formed by the longitudinal direction I of the multilayer tape 17 and the wave crest 23 are made substantially equal to K. The direction (stretching direction) in which the wave crest portion 23 is formed substantially coincides with the circumferential direction G of the flexible tube. That is, the winding angle (J) of the multilayer tape 17 is set in advance, and in the plan view, by using the multilayer tape 17 having the crest portion inclined at an angle (K) corresponding thereto, the stretching of the crest portion 23 is performed. The direction can be made substantially coincident with the circumferential direction of the fluid transporting flexible tube.

  Here, the angle (J) formed by the winding direction I and the circumferential direction G of the flexible tube and the angle (K) formed by the longitudinal direction I of the multilayer tape 17 and the wave crest 23 cause a slight deviation. Consider the case. For example, when the outer diameter of the winding portion of the multilayer tape is D, the axial deviation per winding rotation when the tape is not completely parallel to the circumferential direction is expressed as D · π · tan (JK). The Here, for example, when the outer diameter D of the winding portion of the multilayer tape is 150Φ, when J-K is 5 °, tan 5 ° = 0.087 and the tape winding direction is shifted by about 41 mm. Therefore, the deviation per half rotation is about 20 mm. Therefore, the angle deviation is preferably 5 ° or less. Further, the amount of deviation with a deviation angle of 2.5 ° is about half of the above, which is more preferable.

  FIG. 7 is a view showing another embodiment showing a forming process when the multilayer tape 17 is wound around the interlock pipe 3 formed with the axial force reinforcing layer 10 (the floor layer 15d) by vertical winding. The multilayer tape 17 may be wound vertically as shown in FIG. In this case, the multilayer tape 17 is sent to the interlock pipe 3 so that the longitudinal direction of the multilayer tape 17 is substantially the same as the axial direction of the interlock pipe 3. At this time, both sides of the multilayer tape 17 are bent into a U shape so as to wrap the entire interlock pipe 3 (axial force reinforcing layer 10).

  Further, the interlock pipe 3 (axial force reinforcing layer 10) is wrapped by the multilayer tape 17. That is, both end portions of the multilayer tape 17 are wrapped with the outer peripheral portion of the axial force reinforcing layer 10, and the axial force reinforcing layer 10 is wrapped with the multilayer tape 17. That is, the wrap portion 25 is formed along the axial direction of the interlock pipe 3. As described above, the multi-layered tape 17 may be wound around the axial force reinforcing layer 10 (the floor layer 15d) by vertical winding to form the water shielding layer 11.

  FIG. 8 is a view corresponding to FIG. 4, and FIG. 8 (a) is a view showing a state in which the multilayer tape 17 is vertically wound around the outer periphery of the axial force reinforcing layer 10 (the floor layer 15d). 8 (b) is an enlarged view corresponding to FIG. 4 (b). As shown in FIG. 8A, the wrap portion 25 is formed so as to extend in the axial direction of the flexible tube (in the direction of arrow L in the figure).

  At this time, as shown in FIG. 8B, the axial direction H of the flexible tube and the circumferential direction G of the flexible tube are perpendicular to each other. Further, the longitudinal direction I of the multilayer tape 17 and the axial direction H of the flexible tube coincide with each other. Therefore, if the angle formed by the circumferential direction G of the flexible tube and the axial direction H of the flexible tube is J, J is approximately 90 degrees. Further, as described above, the angle K formed by the longitudinal direction I of the multilayer tape 17 and the wave crest 23 is also 90 °.

  Therefore, even in the case of longitudinal winding, the angle J (90 °) of the circumferential direction G of the flexible tube with respect to the winding direction I of the multilayer tape 17 and the longitudinal direction I of the multilayer tape 17 and the wave crest 23 By making the formed angle substantially coincide with K (90 °), the extending direction of the wave crest portion 23 can be made substantially coincident with the circumferential direction of the fluid transporting flexible tube.

  FIG. 9 is a view showing another multilayer tape 17b, FIG. 9A is a perspective view of the multilayer tape 17b (a perspective view of the resin coating portion 21), and FIG. 9B is a conceptual plan view of the metal layer 19. FIG. It is. In the present invention, a multilayer tape 17b as shown in FIG. 9 may be used. The multilayer tape 17b has substantially the same configuration as the multilayer tape 17, but the form of the metal layer 19 is different.

  As described above, the wave crest portion 23 is continuously formed in the multilayer tape 17. That is, as shown in FIG. 3, the multilayer tape 17 has a wave shape in one direction, and does not have a wave shape in a cross section along the wave crest portion 23. On the other hand, the multilayer tape 17b has a wave shape in at least two different directions (the S direction and the T direction in FIG. 9B). Therefore, the peak part 27 and the trough part 29 (wave crest part) are formed in a grid | lattice form. The cross-sectional view taken along the line RR in FIG. 9B is the same as the multilayer tape 17 (FIG. 2B).

  As such a multi-layered tape 17b, the resin may be extruded and coated on a metal film that has been embossed as shown in FIG. 9, or the resin may be integrated by injection by installing in a corresponding mold. May be. Or the resin member and metal film which have the corresponding uneven | corrugated shape each formed separately and integrated by well-known techniques, such as adhesion | attachment and pressure bonding, may be used. Moreover, a metal layer can also be formed by vapor deposition on a resin member whose surface is previously formed in an embossed shape.

  Such a multilayer tape 17b is wound around the outer periphery of the axial force reinforcing layer 10 (the floor layer 15d) by any one of the methods shown in FIG. 4 or FIG. For the multilayer tape 17b, the parallel direction of the wave crests as described above (for example, the S direction or the T direction in FIG. 9B) and the winding angle of the multilayer tape 17b may be matched. Further, the multilayer tape 17b can be deformed in any direction. For this reason, sufficient flexibility can be obtained even if the winding angle and the parallel direction of the wave crests (S direction or T direction in FIG. 9B) do not completely coincide.

  Next, the function of the multilayer tape 17 when the flexible tube 1 is deformed will be described. FIG. 10 is a view showing a state in which the flexible tube 1 is deformed. As shown in FIG. 10A, when the flexible tube 1 is bent and deformed (in the direction of arrow M in the drawing), the bending outer periphery side (N portion in the drawing) of the flexible tube 1 becomes tensile deformation.

  FIG.10 (b) is a schematic diagram which shows the state of the multilayer tape 17 in the N section of Fig.10 (a). In addition, FIG.10 (b) is a figure which shows the state by which the multilayer tape 17 was spirally wound, for example. When the flexible tube 1 is bent and deformed locally and tensile deformation occurs locally, the multi-layer tape 17 wound around the portion also undergoes tensile deformation in the width direction and tries to follow the bending of the flexible tube 1 (see FIG. Middle arrow Q direction). At this time, the resin coating portion 21 can be easily deformed following the elastic deformability of the resin.

  On the other hand, since the metal layer 19 has a wave shape, the metal layer 19 can easily follow the deformation by the expansion and contraction of the wave. In particular, since the wave crest portion 23 is formed so as to extend in the circumferential direction of the flexible tube 1, the expansion / contraction deformation direction due to the wave shape corresponds to the axial direction of the flexible tube 1. For this reason, with respect to the bending deformation of the flexible tube 1, the multilayer tape 17 (water shielding layer 11) can easily follow and deform. That is, the winding of the multilayer tape 17 having the metal layer 19 does not hinder the flexibility (deformation) of the flexible tube 1.

  Next, the function of the water shielding layer 11 will be described. FIG. 11 is a view showing a cross section of the flexible tube 1, FIG. 11 (a) is an axial cross-sectional view, and FIG. 11 (b) is an enlarged view of a multilayer tape 17 constituting the water shielding layer 11. is there. As described above, the flexible tube 1 is usually used, for example, submerged or floated in the sea. Therefore, the protective layer 13 is always in contact with seawater. Since the protective layer 13 is made of resin, it has a certain level of waterproofness, but the resin itself has a slight water absorption. For this reason, the seawater component penetrates into the protective layer 13 slightly. In particular, a high water pressure is applied to the seabed, and there is a great risk of penetration of seawater components into the protective layer 13 when used for a long time (in the direction of arrow O in the figure).

  However, in the flexible tube 1 according to the present invention, the water shielding layer 11 is provided on the inner peripheral surface of the protective layer 13. Therefore, as shown in FIG. 11B, the water shielding layer 11 reliably shields the ingress of water from the outside by the internal metal layer 19 (in the direction of arrow P in the figure). Therefore, the resin constituting the axial force reinforcing layer 10 is not deteriorated by water.

  As described above, according to the flexible tube 1 according to the first embodiment, since the water shielding layer 11 is provided on the outer periphery of the protective layer 13, the reinforcing layer deteriorates due to the ingress of water from the outside. There is no. Moreover, since the water shielding layer 11 is composed of the multilayer tape 17 with the metal layer 19 sandwiched between the resin coating parts 21, the flow of water from the outside in the tubular body diameter direction is reliably shielded by the metal layer 19, The reinforcing layer does not deteriorate.

  In addition, since the metal layer 19 is sandwiched between the resin coating portions 21, the water shielding layer 11 can be reliably constructed without the metal layer 19 being torn or bent during construction of the water shielding layer 11. Furthermore, since the metal layer 19 does not directly contact the axial force reinforcing layer 10, each layer is not damaged during manufacturing.

  Further, since the metal layer 19 has a wave shape in the cross section of the multilayer tape 17, the multilayer tape 17 (metal layer 19) can be easily stretched and deformed in the waveform direction when the multilayer tape 17 is wound. is there. Further, by forming the metal layer 19 into a wave shape, local stress concentration generated in the metal layer 19 can be reduced when the flexible tube is bent. For this reason, a long-term repeated bending fatigue characteristic can be improved and the flexible tube excellent in long-term reliability can be obtained.

  In particular, the corrugated crest 23 of the metal layer 19 is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape 17. In addition, the angle formed between the longitudinal direction of the multilayer tape 17 and the wave crest portion 23 in the wave shape of the metal layer 19 and the winding angle of the multilayer tape 17 with respect to the circumferential direction of the flexible tube 1 are substantially matched to each other. The extending direction of the wave crest portion 23 in the state where the layer tape 17 is wound can be made substantially coincident with the circumferential direction of the flexible tube 1. Therefore, the multilayer tape 17 (metal layer 19) easily follows the deformation direction when the flexible tube 1 is bent, and high flexibility can be ensured. Further, by forming the metal layer 19 in an embossed shape, a wave shape is formed in any two different directions. For this reason, it can follow a deformation | transformation with respect to any direction, and is excellent also in the productivity of a multilayer tape.

  Next, another embodiment will be described. In the following embodiments, components having the same functions as those of the flexible tube 1 shown in FIGS. 1 to 11 are denoted by the same reference numerals as those in FIGS. 1 to 11 to avoid redundant description.

  FIG. 12 is a diagram showing another embodiment of the shape of the metal layer 19 in the cross section of the multilayer tape. The shape of the metal layer 19 in the cross section of the multilayer tape is not limited to the above-described example. For example, as in the multilayer tape 30 shown in FIG. May be. Even in this case, the wave crest portion 23 is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape 30, so that the same effect as that of the multilayer tape 17 is achieved.

  Further, for example, the wave shape may be a rectangular wave as in the multilayer tape 40 shown in FIG. Further, like the multilayer tape 50 shown in FIG. 12C, the wave shape may be a triangular wave. Even in this case, by forming the wave crest portion 23 at a predetermined angle with respect to the longitudinal direction of the multilayer tape, the same effect as the multilayer tape 17 can be obtained. The wave shape is not limited to these embodiments, and may be any form that can be expanded and contracted. Such various wave shapes may be formed in one direction (similar to the multilayer tape 17) or may be formed in two directions (similar to the multilayer tape 17b).

  Further, as shown in FIG. 13A, a shielding layer 7 may be provided on the outer periphery of the resin layer 5. The shielding layer 7 shields corrosive gas (such as sulfide) generated from the fluid flowing in the interlock pipe 3. The shielding layer 7 may be any layer that prevents the penetration of corrosive gas, and the multilayer tape described above can be used. Further, the resin coating portion 21 of the multilayer tape used for the shielding layer 7 may contain metal particles such as a sulfide trap material. When the sulfide trap material is contained, a resin layer made of only ordinary resin can be used without the metal layer 19.

  Similarly, as shown in FIG. 13B, the resin layers 5a and 5b may be formed on both sides (inner periphery and outer periphery) of the shielding layer 7. Even in this case, since hydrogen sulfide and the like are shielded by the shielding layer 7, it is possible to prevent hydrogen sulfide and the like from entering the reinforcing layer. That is, the resin layer may be formed on at least one of the inner peripheral side or the outer peripheral side of the shielding layer 7.

  In the case where the resin layer is formed on the outer peripheral side of the shielding layer 7, in order to make the shielding layer 7 function more stably, as the resin of the resin coating portion of the multilayer tape constituting the shielding layer 7, a resin is used. A resin having a melting point lower than that of the resin forming the layer 5 (5b) and having compatibility with the resin forming the resin layer 5 can be used.

  If the resin coating part 21 and the resin layer 5 (5b) are compatible and the melting point of the resin coating part 21 is low, the resin layer 5 is formed when the resin of the resin layer 5 is pushed out to the outer peripheral side of the shielding layer 7. (5b) and the resin coating portion 21 are easily integrated with each other. Therefore, when the resin layer 5 (5b) is formed, there is no displacement or twist between the shielding layer 7 and the resin layer 5 (5b), and the flexible tube 1 is shielded when it is bent. Part of the layer 7 is not damaged.

  As a material having such a relationship, for example, the resin covering portion 21 may be nylon 12 and the resin layer 5 (5b) may be nylon 11. As described above, the resin coating portion 21 (or the surface thereof) may be made of a rubber material.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1, 1a, 1b ......... Flexible tube 3 ......... Interlock tube 5 ......... Resin layer 7 ......... Shielding layer 9 ......... Internal pressure-resistant reinforcement layer 10 ......... Axial force reinforcement layer 11 ......... Water shielding layer 13 ...... Protective layer 15 a, 15 b, 15 c, 15 d. Covering part 21a ......... Rubber part 23 ......... Wave crest part 25 ......... Lap part 27 ......... Mountain part 29 ......... Tani part

Claims (10)

A flexible interlock tube;
A resin layer provided on the outer peripheral side of the interlock pipe;
An internal pressure-proof reinforcing layer provided on the outer peripheral side of the resin layer;
An axial force reinforcing layer provided on the outer peripheral side of the internal pressure resistant reinforcing layer;
A water shielding layer provided on the outer peripheral side of the axial force reinforcing layer;
A protective layer provided on the outer peripheral side of the water shielding layer;
Comprising at least
The axial force reinforcing layer is made of fiber reinforced plastic,
The water shielding layer is formed by a multilayer tape in which a metal layer is sandwiched between resins,
The metal layer is at least partially wavy in the cross section of the multilayer tape,
The flexible pipe for transporting fluid, wherein the water shielding layer can prevent the resin constituting the axial force reinforcing layer from being deteriorated by water that permeates the protective layer.   In the plane of the multilayer tape, a wave crest in the corrugated shape of the metal layer is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape, and the corrugated shape of the metal layer is the multilayer 2. The flexible tube for fluid transportation according to claim 1, wherein the flat surface of the tape is formed in two different directions, and wave-like peaks or valleys are formed in a lattice shape.   The angle formed between the longitudinal direction of the multilayer tape and the formation direction of the wave crest portion in the corrugated shape of the metal layer substantially coincides with the winding angle of the multilayer tape with respect to the circumferential direction of the fluid transport flexible tube, 3. The fluid transport flexible tube according to claim 2, wherein a formation direction of the wave crest portion substantially coincides with a circumferential direction of the fluid transport flexible tube in a state where the multilayer tape is wound.   4. The fluid according to claim 1, wherein the resin portion of the multilayer tape is made of a resin having compatibility with the protective layer and having a lower melting point than the protective layer. Flexible tube for transportation.   The flexible tube for fluid transportation according to any one of claims 1 to 3, wherein at least a surface of the multilayer tape is made of a rubber material, and the rubber material is in close contact with the protective layer. A flexible interlock pipe is fed in the tube axis direction, a resin layer is formed on the outer peripheral side of the interlock pipe, an internal pressure-proof reinforcing layer is provided on the outer peripheral side of the resin layer, and the outer periphery of the internal pressure-proof reinforcing layer An axial force reinforcing layer is formed on the outer periphery of the axial force reinforcing layer, and a water shielding layer is formed on the outer periphery of the axial force reinforcing layer, and a protective layer is extrusion coated on the outer periphery of the water shielding layer. There,
The water shielding layer is formed by a multilayer tape in which a metal layer is sandwiched between resins, and the metal layer is at least partially wavy in the cross section of the multilayer tape,
In the plane of the multilayer tape, the wave crest forming direction in the wave shape of the metal layer is formed at a predetermined angle with respect to the longitudinal direction of the multilayer tape,
The angle formed between the longitudinal direction of the multilayer tape and the wave crest forming direction in the corrugated shape of the metal layer is substantially matched with the winding angle of the multilayer tape with respect to the circumferential direction of the fluid transport flexible tube, The flexible tube for fluid transportation is characterized in that the water shielding layer is formed by winding the multilayer tape so that the extending direction of the wave crest portion is substantially coincident with the circumferential direction of the flexible tube for fluid transportation. Production method. The corrugated shape of the metal layer is formed in two different directions in the plane of the multilayer tape, and the corrugated peaks or troughs are formed in a lattice shape,
The fluid according to claim 6, wherein one angle formed by a longitudinal direction of the multilayer tape and a formation direction of a wave crest portion in the wave shape of the metal layer substantially coincides with a winding angle of the multilayer tape. A manufacturing method of a flexible tube for transportation.   The multilayer tape is spirally wound around the flexible tube for fluid transportation so that the end portions in the width direction do not overlap each other, and covers the gap between the multilayer tapes on the inner layer side, The method for producing a flexible tube for fluid transportation according to claim 6 or 7, wherein two or more layers of the multilayer tape are wound.   The said multilayer tape is wound around the said flexible tube for fluid transports helically so that the width direction edge part of the said multilayer tape may mutually wrap, The Claim 6 or Claim 7 characterized by the above-mentioned. The manufacturing method of the flexible pipe for fluid conveyance of description.   The multilayer tape is wound so that the longitudinal direction of the multilayer tape substantially coincides with the axial direction of the fluid transport flexible tube, and the width direction of the multilayer tape is the circumferential direction of the fluid transport flexible tube. The method for producing a flexible tube for fluid transportation according to claim 6 or 7, wherein a lap portion of the layer tape extends in an axial direction of the flexible tube for fluid transportation.

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