JP2801443B2 - Assembling method of terminal fitting for fluid transport pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a terminal fitting attached to a fluid transport pipe used for transporting a fluid such as high-temperature, high-pressure crude oil, water, gas, etc. produced from an offshore oil field. It is related to the improvement of.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, a fluid transport pipe 10 has an inner pipe 12 through which a fluid is transported, a reinforcing layer 14 provided on the inner pipe 12, and a reinforcing layer 14 formed on the inner pipe 12. And an anticorrosive sheath 16 provided thereon. Inner tube 1
As shown in FIG. 4, reference numeral 2 denotes an interlock type helical tube 18 formed by engaging stainless steel tape having an S-shaped cross section to receive an external pressure strength, and an internal fluid coated on the helical tube 18 to cover the internal fluid. The spiral tube 18 is omitted when it is used in a place where external pressure is not applied, such as in a shallow sea area or on land, etc. The reinforcing layer 14 is a two-layer structure formed by winding a reinforcing strip having a C-shaped cross section at a small pitch by meshing with each other so that the inner layer faces outward and the outer layer faces inward. Internal pressure reinforcing layer portion 22 and the internal pressure reinforcing layer portion 22
And two axial reinforcing layer portions 24 formed by winding a metal reinforcing strip having a rectangular cross section at a large pitch.

As shown in FIG. 5, a terminal fitting 26 is provided in a fluid-tight manner on the plastic inner layer 20 exposed at the terminal 10a of the fluid transport pipe 10. Since the terminal fitting 26 needs to be air-tight and liquid-tight so as to prevent leakage of the fluid, if the fluid transport pipe 10 having no spiral pipe 18 inside the plastic inner layer 20 is used, Metal tube 3 for reinforcement having an outer diameter larger than the inner diameter of plastic inner layer 20 inside inner layer 20
0 is inserted and the terminal fitting is assembled. In this case, in the prior art, after the inner circumference of the end of the plastic inner layer 20 is processed into a tapered shape, the metal tube insertion portion 20a of the plastic inner layer 20 is heated and softened, and then the metal is inserted in the longitudinal direction of the plastic inner layer 20 in the longitudinal direction. The terminal fitting was assembled by pressing the pipe 30 evenly.

As shown in FIG. 5, the terminal fitting 26 includes a terminal fitting main body 60 mounted on the plastic inner layer 20 exposed at the terminal 10a of the fluid transport pipe 10, a terminal fitting main body 60 and the fluid transport pipe 10. And a housing 62 mounted between the anticorrosive sheath 16 and the inside of the housing 62 to keep the terminal 10a of the fluid transport pipe 10 stripped airtight and liquidtight. 6
4 are filled. Reference numeral 66 denotes a seal tightening member that tightens the seal member 28 between the terminal fitting main body 60 and the plastic inner layer 20, and reference numeral 68 denotes an annular fixing member that fixes the axial force reinforcing layer portion 24.

[0005]

In this prior art method of assembling a terminal fitting, as shown in FIGS.
(1) Burner 32 (FIG. 6), (2) Dryer 34
(FIG. 7) or (3) The plastic inner layer 20 was heated by the heater 36 (FIG. 8) wound around the outer periphery of the plastic inner layer. However, when the burner 32 is used, the plastic inner layer 20 is heated by direct heat.
Not only oxidizes the surface but also melts the surface of the plastic inner layer 20 due to excessive heating. When the heater 34 is used, the surface of the plastic inner layer 20 is less likely to be oxidized, but has a drawback that the surface of the plastic inner layer 20 is melted due to excessive heating. In order to prevent the plastic inner layer 20 from being excessively heated, the outlet of the burner 32 or the dryer 34 may be moved away from the plastic inner layer 20, but it takes a long time for heating.

[0005] Also, a metal tube 3 is provided in a plastic inner layer 20.
When 0 is inserted, a considerable compressive force is applied to the plastic inner layer 20 at the portion longitudinally away from the end of the plastic inner layer 20 against the tip of the metal tube 30.
Therefore, the plastic inner layer 20 is heated using the heater 36.
When heating the plastic inner layer 20, instead of heating the entire metal tube insertion portion of the plastic inner layer 20 at a constant temperature, the temperature is lowered in a portion separated in the longitudinal direction from the vicinity of the end, so that the plastic inner layer 20 becomes too soft. This is disadvantageous in that the adjustment is difficult. In particular, when the heater 36 is used, there are disadvantages in that the amount of the heater to be wound is limited in terms of cost, and preparation takes time.

[0006] Further, the surface of the plastic inner layer 20 may be scratched, foreign matter or a plastic container adhered thereto, or vertical streaks may be present due to a mold during manufacturing. If the terminal fittings are assembled in the presence of the above, there is a possibility that fluid leakage may occur due to poor sealing.

SUMMARY OF THE INVENTION It is an object of the present invention to avoid the above drawbacks, to easily and surely assemble a terminal fitting so as not to overheat a plastic inner layer and to have a sufficient sealing effect. An object of the present invention is to provide a method of assembling a pipe terminal fitting.

[0008]

In order to solve the above-mentioned problems, the present invention provides a plastic inner layer, a reinforcing layer provided on the plastic inner layer, and an anticorrosion layer provided on the reinforcing layer. A terminal of a fluid transport pipe in which a terminal metal fitting is assembled at an end of the fluid transport pipe with a reinforcing metal pipe having an outer diameter larger than the inner diameter of the plastic layer inserted inside the end of the plastic layer of the fluid transport pipe comprising In the method of assembling a metal fitting, a heat-resistant tape is wound around the outer peripheral surface of the plastic inner layer, and the reinforcing metal tube is inserted into the plastic inner layer while heating the plastic inner layer from above the heat-resistant tape to expand the plastic inner layer. And a method of assembling a terminal fitting for a fluid transport pipe.

[0009]

As described above, when the plastic inner layer is heated from above the heat-resistant tape, the surface of the plastic inner layer is oxidized,
While preventing melting and deformation due to high heat, the metal tube can be inserted in a short time, and if a heat-resistant tape with a smooth surface is used, it can be melted while smoothing the surface of the plastic inner layer, The sealing effect of the sealing member attached between the terminal fitting main body can be enhanced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described in detail. FIG. 1 shows an assembling apparatus 38 for carrying out a method of assembling a terminal fitting according to the present invention.
The holding member 40 for holding the plastic inner layer 20 exposed by stepping off the end 10a of the O, the slide plate 44 for pushing the metal tube 30 into the plastic inner layer 20 by extending the hydraulic cylinder 42, and holding the slide plate 44 Bolt-shaped guide frame 46 which is
And a nut-shaped fixing member 48 for fixing the fixing member 4.
The guide frame 46 is, as shown in FIG.
And comprises three bolts 46a, 46b, 46c disposed about the inner plastic layer 20. The fixing member 48 includes three bolts 46a,
It consists of three sets of nuts 48a, 48b, 48c provided before and after the slide plate 44 on 46b, 46c, respectively. The guide frame 46 passes through a flange plate 40 a attached around the holding fitting 40, and is fixedly fastened with a nut 48.

In order to facilitate insertion of the metal tube 30, the plastic inner layer 20 is previously processed into a tapered inner periphery, and as shown in FIG. 1, a heat-resistant tape 50 having a smooth surface is inserted into the metal tube 30. It is wound around without any gap so as to overlap the outer periphery of the portion, and penetrates and is fixed to the holding bracket 40.
Although it is desirable to use polytetrafluoroethylene as the heat-resistant tape 50, the plastic inner layer 2
Any tape may be used as long as it has a higher melting point than the material of No. 0.

Next, the state of heating the plastic inner layer 20 will be described. After installing the plastic inner layer 20 to the assembly apparatus 38, as shown in FIG. 1, the entire wound portion of the heat-resistant tape 50 of plastic inner layer 20 with a dryer 34 is heated evenly. Therefore, since the plastic inner layer 20 is heated via the heat-resistant tape 50, the surface of the plastic inner layer 20 is not oxidized or dissolved. Further, since the surface of the heat-resistant tape 50 is smooth, the surface of the plastic inner layer 20 is also smooth,
It does not cause sealing failure or the like. In addition, it is desirable to use the dryer 34 as the heating means, because the heating by the dryer can reduce the oxidation of the heated portion as compared with the direct heat heating of the burner, and has a large amount of heat like a heater. This is because no preparation time is required.

In this way, the plastic inner layer 20 is heated, and the surface temperature of the plastic inner layer 20 becomes 50
At this point, the vicinity of the end of the plastic inner layer 20 is concentrated and uniformly heated in the circumferential direction so that the metal tube 30 can be easily inserted, and the vicinity of the end is made flexible. When the surface temperature near the end of the plastic inner layer 20 rises to about 60 °, the hydraulic cylinder 42 is extended and the slide plate 44 is slid, and as shown in FIG. Insert If the metal tube 30 is not aligned with the plastic inner layer 20, the hydraulic cylinder 42 is contracted and the slide plate 44 is
The position of the metal tube 30 is adjusted so as to be aligned with the plastic inner layer 20 by adjusting 8a, 48b, and 48c. When the slide plate 44 is slid, the nut 48
Loosen. After the tip of the metal tube 30 is inserted into the plastic inner layer 20 with the metal tube 30 aligned with the plastic inner layer 20, the hydraulic cylinder 42 is extended while the nut 48 on the insertion side is retracted, The tube 30 is pushed into the plastic inner layer 20, as shown in FIG. After the completion of the pushing, when the plastic inner layer 20 is cooled, the assembling device 38 is removed.

[0014]

According to the present invention, as described above, a plastic inner layer is heated from above a heat-resistant tape.
The metal tube can be inserted in a short time while preventing the surface of the plastic inner layer from oxidizing, melting and deforming due to high heat, and the surface of the heat resistant tape is smooth, so the surface of the plastic inner layer is in a smooth state. And there is a benefit that the sealing effect of the sealing member mounted thereon can be enhanced.

[Brief description of the drawings]

FIG. 1 is a side view of an assembling apparatus for performing an assembling method of a terminal fitting according to the present invention.

FIG. 2 is a side view showing a state where a metal tube used in the present invention is inserted into a plastic inner layer.

FIG. 3 is a side view showing a state where a metal tube used in the present invention is inserted into a plastic inner layer.

FIG. 4 is a perspective view in which an end of a fluid transport pipe to which a terminal fitting is attached by the assembling method of the present invention is stepwise exposed.

FIG. 5 is a cross-sectional view of a fluid transport pipe having no spiral pipe to which a terminal fitting is attached.

FIG. 6 is an explanatory diagram showing a state in which a plastic inner layer is heated by a burner.

FIG. 7 is an explanatory view showing a state where a plastic inner layer is heated by a dryer.

FIG. 8 is an explanatory diagram showing a state where a plastic inner layer is heated by a heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fluid transport pipe 20 Plastic inner layer 26 Terminal fitting 30 Metal pipe 34 Dryer 38 Assembly device 40 Holding fitting 42 Hydraulic cylinder 44 Sliding iron plate 46 Bolt-shaped guide frame 48 Nut-shaped fixing member 50 Heat-resistant tape

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 65/02-65/46 B29C 65/56-65/64 B29C 57/00-57/08 F16L 33 / 01 F16L 58/02 B29L 23:00

Claims (1)

(57) [Claims] [Claim 1 wherein said inside end of the plastic layer of the fluid transport pipe made of a corrosion layer provided on the plastic inner layer and the plastic reinforcing layer provided on the inner and front Symbol reinforcing layer plastic In a method for assembling a terminal fitting of a fluid transport pipe, a terminal fitting is assembled to an end of the fluid transport pipe in a state where a reinforcing metal pipe having an outer diameter larger than the inner diameter of the layer is inserted. A method for assembling a terminal fitting for a fluid transport pipe, comprising: inserting a reinforcing metal pipe into the plastic inner layer while winding the tape and heating the plastic layer from above the heat resistant tape to expand the plastic layer.