JP2008196538A - Buoyancy material for marine hose, marine hose, and marine hose manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress generation of a clearance in an adhering part between the side end surfaces of beltlike buoyancy material composing a buoyancy layer. <P>SOLUTION: The buoyancy layer 30 is formed by spirally winding the beltlike buoyancy material 32 around the outer surface of a base hose 21. The buoyancy material 32 comprises a closed-celled foam element. The crosswise section of the buoyancy material 32 is formed into a parallelogram. Therefore, the end surface 32A of the buoyancy material 32 on one side and the end surface 32B thereof on the other side are superposed one above the other when placed opposite each other, and adhere to each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a marine hose that floats on the sea surface and transports oil and other fluids, a buoyancy material for a marine hose used in the marine hose, and a method for manufacturing the marine hose.

  As a marine hose used in the ocean etc., as shown in FIG. 1, there is a marine hose used for transporting crude oil from a tanker 11 moored on a single point mooring buoy 10. This marine hose includes a marine hose (submarine hose) used in the sea and a marine hose hose (floating hose) used at sea. Among them, marine hoses used on the ocean are required to float on the sea surface and have a buoyancy layer in order to provide buoyancy. In a general marine hose, this buoyancy layer is configured by winding a plurality of layers of a band-like buoyancy material around the outside of the base hose without any gap (see Patent Document 1).

The band-shaped buoyancy material constituting the buoyancy layer is required to be joined without gaps between the side end surfaces, but there may be gaps due to shrinkage of the buoyancy material due to vulcanization treatment, etc. Measures against gaps are required.
JP 55-33946 A

  In consideration of the above facts, the present invention provides a buoyancy material for marine hose, a marine hose, and a marine hose manufacturing method capable of suppressing the occurrence of a gap at the bonding portion between the side end surfaces of the belt-like buoyancy material constituting the buoyancy layer. It is a problem to obtain.

  The buoyancy material for a marine hose according to claim 1 of the present invention has a strip shape, and is wound in a spiral shape so that the side end surfaces adhere to the outside of the base hose, and constitutes a buoyancy layer of the marine hose. The buoyancy material is characterized in that one of the side end surfaces and the other side end surface are inclined so as to be able to adhere to each other from the upper surface side to the lower surface side.

  The buoyancy material for a marine hose of the present invention is used to constitute the buoyancy layer of the marine hose and is wound around the outside of the base hose. Here, the base hose refers to a portion constituting the inner side of the buoyancy layer of the marine hose.

  In the buoyancy material for a marine hose having the above configuration, one side end surface and the other side end surface that are bonded to each other are inclined to a shape that can be bonded to each other. The inclination here means that it is inclined with respect to the normal direction of the surface of the buoyancy material formed into a strip shape. Further, the shape that can be bonded from the upper surface side to the lower surface side refers to a shape that can be bonded over the entire surface when one side end surface and the other side end surface are brought into contact with each other.

  As described above, the side end surfaces are inclined to form a shape that can be bonded from the upper surface side to the lower surface side, so that the bonding area can be widened and bonded by pressing from the outside in the radial direction. Since the surfaces to be pressed can be pressed against each other, it is possible to suppress the occurrence of a gap in the bonded portion due to vulcanization treatment or the like.

  The buoyancy material for a marine hose according to claim 2 is characterized in that the cross section in the width direction is a parallelogram.

  Thus, by making the cross section in the width direction into a parallelogram, the side end face of the buoyancy material can be made into a simple shape.

  The buoyancy material for a marine hose according to claim 3 is characterized in that the angle of inclination is not less than 30 degrees and not more than 60 degrees.

  In consideration of increasing the adhesiveness by pressing the side end surfaces together by pressing inward in the radial direction during the vulcanization process and increasing the bonding area, the tilt angle should be small, but handling at the time of joining Considering ease, breakage of corners, etc., an inclination angle that is too small is not appropriate. The inclination angle is suitably 30 degrees or more and 60 degrees or less, and more preferably, the inclination angle is 45 degrees. The 45 degrees is a numerical value having a certain width and may be substantially 45 degrees.

  The marine hose according to claim 4 has a buoyancy material for the marine hose according to any one of claims 1 to 3 in a spiral shape so that the side end surfaces adhere to the base hose and the outside of the base hose. And a buoyancy layer formed by winding.

  According to the above configuration, since the generation of a gap is suppressed in the bonded portion of the side end surface of the buoyancy material, seawater enters the inside of the marine hose even if the outer surface of the marine hose is damaged. Can be suppressed.

  5. The marine hose manufacturing method according to claim 5, wherein the buoyancy material for marine hose according to any one of claims 1 to 3 is spirally wound so that the side end surfaces adhere to the outside of the base hose. A buoyancy layer is formed, an outer rubber layer is formed outside the buoyancy layer, and then vulcanization is performed.

According to this marine hose manufacturing method, the side end surfaces of the buoyancy material are inclined and can be bonded to each other, so that the bonding area can be widened and bonded by pressing from the outside in the radial direction. Since the surfaces to be pressed can be pressed against each other, it is possible to suppress the occurrence of a gap in the bonded portion due to the vulcanization treatment.
The outer rubber layer is a layer constituting the outermost side of the marine hose, and includes a reinforcement cord when the reinforcement cord is disposed on the outer surface of the buoyancy layer.

  Since this invention set it as the said structure, the clearance gap generation | occurrence | production in the adhesion part of the side end surfaces of the buoyancy material for marine hoses which comprises a buoyancy layer can be suppressed.

  FIG. 1 shows an example of use of a marine hose 20 according to an embodiment of the present invention. The marine hose 20 is used for transporting crude oil from the tanker 11 moored to the one-point mooring buoy 10, and is used by levitating on the sea surface. The marine hose 20 of the present embodiment is a hose that connects between the tanker 11 and the one-point mooring buoy 10. From directly below the one-point mooring buoy 10, a pipeline 14 leading to a land storage facility is laid on the seabed. The one-point mooring buoy 10 and the pipeline 14 are connected by a submarine hose 12 used in the sea.

  FIG. 2 shows a part of a longitudinal section of the marine hose 20. The marine hose 20 includes a nipple 22, an inner rubber tube 23, a first base reinforcing cord 24, a first bead wire 25, a reinforcing wire 26, a second base reinforcing cord 27, a second bead wire 28, an intermediate rubber layer 29, and a buoyancy layer. 30, an outer reinforcing cord 40, and an outer rubber layer 42.

  The nipple 22 has a cylindrical shape, and has a first annular rib 22A on the distal end side (side to be inserted into the marine hose 20) and a second annular rib on the outer side (axially outside of the marine hose 20) than the first annular rib 22A. 22B is formed. The inner rubber tube 23 is extrapolated from the first annular rib 22 </ b> A to the front end side so as to cover the outer surface of the nipple 22.

  The first bead wire 25 is wound in the circumferential direction at a position over the first annular rib 22A from the tip side of the nipple 22. The first base reinforcing cord 24 is folded around the first bead wire 25 and is disposed on the outer surface of the inner rubber tube 23. On the outside of the first base reinforcing cord 24, reinforcing wires 26 are spirally wound at predetermined intervals.

  The second bead wire 28 is wound in the circumferential direction at a position over the second annular rib 22B from the tip side of the nipple 22. The second base reinforcing cord 27 is folded around the second bead wire 28 and is disposed on the outer surface of the first base reinforcing cord 24. The intermediate rubber layer 29 is disposed so as to cover the outer surface of the second base reinforcing cord 27.

  The base hose 21 is formed by the nipple 22, the inner rubber tube 23, the first base reinforcing cord 24, the first bead wire 25, the reinforcing wire 26, the second base reinforcing cord 27, the second bead wire 28, and the intermediate rubber layer 29. Composed.

  As shown in FIG. 3A, the buoyancy layer 30 is configured by a buoyancy material 32 spirally wound around the outer surface of the base hose 21. The buoyancy material 32 is made of a closed-cell foam. The thickness of the buoyancy material 32 is usually about 0.8 mm to 3.0 mm. As a material of the buoyancy material 32, a natural rubber foam, a polyethylene foam, or the like can be used. The cross section of the buoyancy material 32 in the width direction is a parallelogram as shown in FIG. Therefore, one side end surface 32A and the other side end surface 32B of the buoyancy material 32 overlap each other when they are abutted and adhere to each other.

  In addition, it is preferable that the inclination angles θ1 and θ2 of the side end surfaces 32A and 32B of the buoyancy material 32 whose cross section is a parallelogram are 30 degrees or more and 60 degrees or less. In consideration of increasing the adhesiveness by pressing the side end surfaces together by pressing inward in the radial direction during the vulcanization process, and increasing the bonding area, it is better that the inclination angle is small. Taking into account the ease of handling and breakage of the corners, a too small inclination angle is not appropriate. Considering these matters, it is appropriate to set the numerical value range as described above, and it is more preferable that the inclination angle is 45 degrees.

  As shown in FIG. 4, the buoyancy member 32 is spirally wound around the outer surface of the base hose 21 so that the adjacent side end surface 32A and side end surface 32B are bonded to each other without any gap. The base hose 21 is spirally wound from one end to the other end in the longitudinal direction so as to cover the outer surface to form one layer, and a plurality of layers are laminated in the same manner on the outside of the configured layer (general) 3 to 6 layers (3 layers in this embodiment), and the buoyancy layer 30 is configured.

  The outer side of the buoyancy layer 30 is covered with an outer reinforcing cord 40, and the outer side of the outer reinforcing cord 40 is covered with an outer rubber layer 42. The outer rubber layer 42 constitutes the outermost surface of the marine hose 20.

  Next, a method for manufacturing the marine hose 20 having the above configuration will be described.

  The pre-molded inner rubber tube 23 is extrapolated up to the front of the first annular rib 22A on the tip side of the nipple 22. And the 1st bead wire 25 is arrange | positioned in the position which got over the 1st annular rib 22A, and the outer side of the inner surface rubber tube 23 is covered with the 1st base reinforcement cord 24. FIG.

  Next, the reinforcing wire 26 is spirally wound around the outer side of the first base reinforcing cord 24, and the second bead wire 28 is disposed at a position over the second annular rib 22 </ b> B. 1 The outer side of the base reinforcing cord 24 is covered. The outside is covered with an intermediate rubber layer 29. And a primary vulcanization process is performed and the base hose 21 is manufactured.

  Next, the buoyancy material 32 is spirally wound around the outside of the base hose 21 without gaps to form a three-layer configuration, and the buoyancy layer 30 is configured. At this time, an adhesive is applied to the side end surfaces 32A and 32B of the buoyancy material 32, and the buoyancy material 32 is adhered to each other without a gap.

  Next, the outside of the buoyancy layer 30 is covered with the outer reinforcing cord 40, and the outside of the outer reinforcing cord 40 is covered with the outer rubber layer 42. Then, a second vulcanization process is performed. In the second vulcanization treatment, pressure from the outside to the inside in the radial direction is applied. In this way, the marine hose 20 is manufactured.

  In the present embodiment, the side end surfaces 32A and 32B of the buoyancy material 32 before the second vulcanization treatment are bonded so that the side end surfaces 32A and 32B are inclined as shown in FIG. Therefore, even if the side end surfaces 32A and 32B are pressed against each other by pressing from the outside in the radial direction to the inside, and the buoyancy material 32 contracts by vulcanization, the adhesion is maintained as shown in FIG. be able to.

  In addition, when the side end surface P is perpendicular to the upper surface and the lower surface as in the prior art, as shown in FIG. 6A, the interface between the side end surfaces P is not inclined with respect to the radial direction. Therefore, even if the pressure is applied from the outside in the radial direction toward the inside, the side end faces are not pressed against each other and bonded, and when the buoyancy material F shrinks by vulcanization, as shown in FIG. A gap S has occurred.

  As described above, according to the buoyancy material 32 for a marine hose of the present embodiment, a good adhesion state between the side end surfaces can be maintained even after the vulcanization treatment.

  Further, in the marine hose 20 of the present embodiment, the side end surfaces of the buoyancy material 32 wound spirally in the buoyancy layer 30 are well bonded. Therefore, even if the outer rubber layer 42 and the outer reinforcing cord 40 are damaged, seawater can be prevented from flowing in from the gap at the joint portion of the buoyancy layer 30.

  In the present embodiment, the example in which the cross section of the buoyancy material 32 is a parallelogram has been described. However, the cross section of the buoyancy material is not necessarily a parallelogram. For example, as shown in FIG. 7A, the side end surfaces 34A and 34B may have a curved cross-sectional shape, or as shown in FIG. 7B, one of the side end surfaces 36A has a mountain shape. The cross-sectional shape of the side end face 36 </ b> B that constitutes an inclination such that the other has a concave shape corresponding to the mountain shape may be used.

It is explanatory drawing which shows the marine hose used for transport of the crude oil from a tanker. It is a partial half sectional view of the longitudinal direction of the marine hose of this embodiment. (A) is explanatory drawing which shows the winding state to the base hose of the buoyancy material of this embodiment, (B) is a partial cross section figure of the wound buoyancy material. It is explanatory drawing which shows the winding state to the base hose of the buoyancy material of this embodiment. (A) of the junction part of the buoyancy material of this embodiment is sectional drawing before a vulcanization process, (B) is sectional drawing after a vulcanization process. (A) of the junction part of the conventional buoyancy material is sectional drawing before a vulcanization process, (B) is sectional drawing after a vulcanization process. It is sectional drawing of the modification of the buoyancy material of this embodiment.

Explanation of symbols

20 Marine hose 21 Base hose 30 Buoyancy layer 32 Buoyant material 32A Side end face 32B Side end face 34A Side end face 34B Side end face 36A Side end face 36B Side end face

Claims (5)

A buoyancy material for a marine hose, which is formed in a belt shape, is spirally wound so that the side end surfaces adhere to the outside of the base hose, and constitutes the buoyancy layer of the marine hose,
A buoyancy material for a marine hose, characterized in that one side end surface and the other side end surface are inclined so as to be able to adhere to each other from the upper surface side to the lower surface side.   The buoyancy material for a marine hose according to claim 1, wherein the cross section in the width direction is a parallelogram.   The buoyancy material for a marine hose according to claim 1 or 2, wherein the inclination angle is not less than 30 degrees and not more than 60 degrees. A base hose,
A buoyancy layer formed by spirally winding the buoyancy material for a marine hose according to any one of claims 1 to 3 so that the side end surfaces adhere to the outside of the base hose;
Marine hose equipped with. A buoyancy layer is formed by spirally winding the buoyancy material for a marine hose according to any one of claims 1 to 3 so that the side end surfaces adhere to the outside of the base hose,
Forming an outer rubber layer outside the buoyancy layer;
A marine hose manufacturing method in which vulcanization is then performed.

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