JP2002257267A - Structure of marine hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a marine hose, having improved breaking strength, at least at the same number or less of layers by uniforming a force applied to a fiber cord every fiber cord layer. SOLUTION: An orientation angle α of the fiber cores 4d and 7a of a fiber cord layer 5 which approaches closest to a steel wire layer 6 is set in the range of 35 deg. to less than 55 deg., preferably in the range of 35 deg. to less than 47 deg.. The range of 35 deg. to less than 55 deg. of the orientation angle α is, furthermore set by taking into consideration fatigue, extension, or the like of the fiber cords.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a marine hose for transporting a fluid, and more particularly, to equalizing the stress applied to the fiber cords of a fiber reinforced cord layer and improving the breaking pressure while reducing the number of layers. It relates to the structure of a marine hose.

[0002]

2. Description of the Related Art Conventionally, a marine hose for transporting oil such as crude oil by connecting an oil tank installed on land to store oil and the like and an oil tanker anchored at sea has been disposed in the innermost layer thereof. the rubber tube layer, and a plurality of layers fibrous reinforcing cord layer of each fiber cord is wound so as to intersect each other rubber-coated, and steel wire layers wound spirally in the longitudinal direction of the hose, the outer A plurality of the same fiber-reinforced cord layers as described above are sequentially laminated to form a main body pressure-resistant cord layer, and the outermost layer is covered with a cover rubber layer.

[0003]

[SUMMARY OF THE INVENTION Incidentally, the fiber reinforcing cord layer disposed on the inner side of the steel wire layer functions as a voltage-blocking layer with respect to the axial direction of the inner pressure of the marine hose and steel wire layer, the marine hose function as the withstand voltage layer to the circumferential direction of the inner pressure, thus, although the orientation angle of the code should be set by the function of each layer, the conventional marine hose, for example, in the case of the fiber reinforcing cord layer, 37 ° Or 40 °, all of which had a uniform structure.

Further, the orientation angle of the fiber cords of the fiber reinforcing cord layer, when set to more than 55 °, becomes large number plies of fibrous reinforcing cord layer to charge of axial stress, also the orientation angle of the fiber cord If is smaller than 35 °, it is necessary to increase the number of plies for covering the circumferential stress, which is not preferable. Further, since the steel wire layer is a pressure-resistant layer against the internal pressure in the circumferential direction as described above, the orientation angle of the cord can be allowed up to 90 °, but if the cord angle is smaller than 70 °, the number of plies is reduced. Must be increased, which is not preferable.

Further, since the fiber reinforced cord is uniformly twisted at the above-mentioned orientation angle, the stress of the fiber cord varies from layer to layer due to the pressure of the fluid passing through the inner pipe, and particularly, steel wire is used. The fiber reinforced cord layer located between the layers or in the vicinity thereof has a problem that the difference in the orientation angle of the cords and the uniform orientation angle cause variations in the tension, thereby lowering the breaking strength of the fiber reinforced layer. Was.

SUMMARY OF THE INVENTION An object of the present invention is to provide a marine hose structure in which the breaking strength is improved with at least the same number of layers by equalizing the forces applied to the fiber cords of the respective fiber cord layers. .

[0007]

According to the present invention, in order to achieve the above object, the orientation angle of the fiber cord of the fiber reinforced cord layer closest to the steel wire layer is set to 35 ° or more to 5 ° or more.
The gist is that the angle is set to a range of less than 5 ° and is changed for each layer.

In addition, the orientation angle to be changed for each layer is as follows:
The gist is that the angle is in the range of 0 ° or more and less than 4 °, and the number of layers to be changed is every plural layers.

The present invention is configured as described above, and sets the orientation angle of the fiber cord of the fiber cord layer closest to the steel wire to a range of 35 ° or more to less than 55 °,
The orientation angle of the fiber cords arranged outside of the fiber cord, the layers each, or at 0 ° to 4 ° varied laminating it every two layers, and equalize the forces on the fiber cord each of the layers, at least With the same number of layers or less, the breaking strength can be improved.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view showing the orientation of fiber cords of a marine hose embodying the present invention, and FIG.
FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG. 2, and the marine hose has mounting flanges 2a and 2b integrally provided at both ends of a hose body 1.

The hose main body 1 has a plurality of layers (a plurality of layers) formed by winding fiber cords 4a to 4d coated with rubber such as polyester cord on a rubber tube layer 3 provided at the innermost layer so as to cross each other. it is a four-layer in the embodiment, but 2
Layer to 10 layers), a steel wire layer 6 spirally wound in the longitudinal direction of the hose body 1, and a fiber cord 7a rubber-coated on the outside. To 7c wound so as to cross each other (three layers in this embodiment, but two to one layers).
And a fiber reinforced cord layer 8 are sequentially laminated to form a main body pressure-resistant cord layer 9, and the outermost layer is covered with a cover rubber layer 10.

In the embodiment of the present invention, the orientation angle α of the fiber cords 4d and 7a of the fiber cord layer 5 closest to the steel wire layer 6 is in the range of 35 ° or more and less than 55 °, preferably 35 ° or more. It is set in a range of less than 47 °. The range where the orientation angle α is 35 ° or more and less than 55 ° is set in consideration of the fatigue and elongation of the fiber cord.

Further, the orientation angle α is 35 ° or more and 55 ° or more.
Fiber cord 4d set in a range of less than °, fiber cords 4a~4c and 7b is disposed outside of the internal and external 7a, the orientation angle of 7c, each layer each, preferably 0 ° to 4 ° for each of a plurality layers
Change and stack.

[0015] With this configuration, by equalizing the force applied to fiber cords each of the layers, in which it is possible to improve the fracture strength below least the same layer number.

With the above-described structure, the pressure of the fluid W passing through the inner pipe does not cause a variation in each layer, and the fiber cords 4a to 4a of the fiber reinforced cord layer 5 do not vary.
The stress applied to each of the d and the fiber reinforcement cord layer 7a to 7c can be equalized, and the breaking strength can be improved with at least the same number of layers or less.

Table 1 below shows a comparison between the tension (N) and the braid angle (°) of each layer of the marine hose according to the embodiment of the present invention and the conventional marine hose. , FEM analysis method, and the FEM analysis method is “OCIMF (Oil Companies Int.
marine standards) under the same conditions as the hydraulic test of the “European Marine Forum” standard. (a). FEM analysis method In the FEM analysis method, a three-dimensional model is created using a cross-section (two-dimensional) of this axis-symmetric model by creating an axis-symmetric model having the same cross-section rotated 360 degrees from an arbitrary axis. It is a method of analysis.

In the embodiment of the present invention, the analysis is performed by applying an internal pressure to the inside of the marine hose, under the same conditions as the marine hose destruction test.

The outline of the pressure test specified in the OCIMF standard is as follows.

(1). All hoses are tested with water at rated pressure.

[0021] (2). Water pressure recorder is used for this test.

(3) Place as straight as possible on a support that does not restrain elongation. (b) Material constant (1) Polyester fiber Young's modulus 66930 MPa Poisson's ratio of 0.3 (2). Body wire Young's modulus 210000 MPa Poisson's ratio 0.29 (3). Rubber material Young's modulus 40 MPa Poisson's Ratio 0.4999 (4) the polyester fiber reinforced layer 18 layer

[0023]

[Table 1] As is clear from the above Table 1, the orientation angle of the fiber cord of the fiber cord layer closest to the steel wire was 35 degrees.
° or more and less than 55 °, and the orientation angle of the fiber cords disposed outside the fiber cords is changed by 0 ° to 4 ° for each layer or for each of a plurality of layers, and the conventional structure is obtained. The maximum tension in the polyester fiber layer is 1
0.8% reduction. As described above, it was found that the force applied to the fiber cord in each layer can be made uniform, and the breaking strength can be improved by about 10% at least with the same number of layers or less.

[0024]

Effects of the Invention The present invention, the orientation angle of the fiber cords of the fiber reinforcing cord layer closest to the steel wire layer as described above, and sets the range of less than 35 ° or more to 55 °, varies from layer With this configuration, the force applied to the fiber cord of each layer can be equalized, and the breaking strength can be improved with at least the same number of layers or less.

[Brief description of the drawings]

FIG. 1 is a front view showing an orientation state of a fiber cord of a marine hose embodying the present invention.

FIG. 2 is an enlarged view of a portion X in FIG.

FIG. 3 is an enlarged sectional view taken on line AA of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hose main body part 2a, 2b Mounting flange 3 Rubber tube layer 4a-4d Fiber cord 5 Fiber reinforcement cord layer 6 Steel wire layer 7a-7c Fiber reinforcement cord 8 Fiber reinforcement cord layer 9 Body pressure resistant cord layer 10 Cover rubber layer

 ────────────────────────────────────────────────── ─── front page of the continuation (72) inventor Shimanoe Akira Hiratsuka, Kanagawa Prefecture Oiwake No. 2 No. 1 Yokohama rubber Co., Ltd. Hiratsuka Factory in the F-term (reference) 3H111 AA02 BA11 BA29 BA34 CA53 CB07 CC03 CC18 CC20 DA26 DB08 4F100 AB04C AK41 AN00A AN00E BA05 BA07 BA10A BA10E BA22 DA02 DG03B DG03C DG03D GB31 GB90 JK03

Claims (3)

[The claims] 1. A plurality of fiber reinforced cord layers in which respective fiber cords are wound so as to intersect with each other on a rubber tube layer disposed on an innermost layer, and spirally wound in a longitudinal direction of a hose. and steel wire layer which is, in the structure of the outer sequentially are stacked with the same fiber reinforcing cord layer of the plurality of layers to form body-voltage cord layer, marine hose formed by the outermost layer to cover the cover rubber layer the orientation angle of the fiber cord closest to the fiber reinforcing cord layer to a steel wire layer, and sets the range of less than 35 ° or more to 55 °, the structure of the marine hose comprising constructed by changing for each layer. 2. The method according to claim 1, wherein the orientation angle changed for each layer is 0 °.
Structure of the marine hose according to claim 1 in which the range of less than to 4 ° or more. 3. A layer for the change, the structure of the marine hose according to claim 1 or 2 is a plurality of layers each.