JPH0369036B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a method for assembling a terminal fitting to a flexible fluid transport pipe for transporting high pressure fluid such as oil extracted from an offshore oil field. It is.

(Prior art) In general, this type of fluid transport pipe consists of an inner reinforcing member spirally provided at small pitches on the inner pipe, and a plurality of filaments wound spirally on the inner reinforcing member at large pitches. The terminal fitting is made up of a formed outer reinforcing member and a sheath provided thereon, and the terminal fitting includes a terminal fitting body which is liquid-tightly mounted on the inner pipe exposed at the end of the fluid transport pipe, and this terminal fitting. It consists of an outer case that fixes the metal fitting body to the end of the fluid transport pipe. In the prior art, the portion of the outer case of the terminal fitting that receives the gasket was integrally formed. On the other hand, this terminal fitting fixes the reinforcing member at the end of the fluid transport pipe,
The terminal fitting main body is fixed to the end of the fluid transport pipe, and then the outer case is fixed between the terminal fitting main body and the sheath of the fluid transport pipe so as to surround the fixed portion of the reinforcing member, and assembled. In this case, the outer case cannot be fitted to the fluid transport pipe after the terminal fitting main body is fixed, so the outer case is fitted from the end of the fluid transport pipe before the terminal fitting main body is attached, and For the purpose of attaching the metal fitting body and fixing the reinforcing member, it is necessary to move it to the inside of the fluid transport pipe. However, the outer diameter of the sheath of the fluid transport pipe varies due to manufacturing reasons, and the surface is not necessarily smooth, making it difficult to bring the outer case closer to the inside of the fluid transport pipe. Therefore, it is necessary to slightly increase the inner diameter of the outer case to leave a gap between it and the sheath, which reduces the sealing effect of the gasket. In addition, to reduce the price, the outer case is often made of plated steel, but during assembly, the inner surface of the outer case needs to be cut to match the outer diameter of the sheath, resulting in the problem of corrosion on the cut inner surface. occurs. Furthermore, attempts have been made to surface finish the sheath of the fluid transport tube to match the inner surface of the outer case, but in this case, the sheath needs to be finished over the length of the outer case, making the work complicated. There was a drawback.

(Object of the Invention) An object of the present invention is to provide a method of assembling a terminal fitting for a fluid transport pipe, which allows the outer case to be easily attached to the sheath of the fluid transport pipe with a high sealing effect.

(Structure of the Invention) A fluid transport pipe to which the method of the present invention is applied has an inner reinforcing member spirally provided at small pitches on the inner pipe, and a plurality of filament bodies arranged on the inner reinforcing member in a large pitch. Installed in a fluid-tight manner over the exposed inner pipe at the end of the fluid transport pipe, which consists of a plurality of outer reinforcing members formed by winding the outer reinforcing members in a spiral shape, and a sheath provided on the outer reinforcing members. In a method for assembling a terminal fitting consisting of a terminal fitting main body and an outer case that is installed fluid-tightly by spanning between the terminal fitting main body and the sheath of a fluid transport pipe, the outer case is larger than the outer diameter of the fluid transport pipe. The gasket fitting, which also has an inward flange with a large inner diameter and is to be fitted onto the fluid transport pipe in advance and then attached to the inner surface of the inward flange of the outer case via a sealing member, is attached to the fluid transport pipe. The gasket holder is placed on the sheath and engages with a sheath holder that holds the end of the sheath of the fluid transport tube, and the gasket provided between the gasket holder and the sheath is tightened by the gasket attached to the gasket holder. The metal fittings are tightened to attach the gasket to the sheath in a liquid-tight manner, and the plurality of outer reinforcing members exposed at the end of the fluid transport pipe are placed between the terminal fitting main body and the gasket receiving fitting, and the outer reinforcing members are provided on top of the outer reinforcing members. Fold it along the outer reinforcing member holder that engages with the metal fittings and weld and fix it to the outer reinforcing member holder,
In addition, a shield gasket is placed between the terminal fitting body and the inner pipe, and this shield gasket is tightened with a gasket tightening fitting fixed to the terminal fitting body to liquid-tightly fix the terminal fitting body to the inner pipe. The outer case is pulled back so as to straddle between the terminal fitting body and the gasket receiving fitting, and is liquid-tightly tightened to the terminal fitting body and the gasket receiving fitting, respectively, via a sealing member.

In this method, the gasket holder is separated from the outer case, so the inner diameter of the outer case is large, and the length of the surface finish of the sheath is sufficiently short compared to the outer case. Since it is sufficient to shift the length of the metal fitting, the outer case can be installed between the sheath of the fluid transport pipe and the terminal fitting body with high workability and a high sealing effect.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 shows a fluid transport pipe terminal fitting 10 assembled by the method of the present invention, and shows a fluid transport pipe 1
2 is an inner reinforcing member 16 made of a C-shaped metal strip spirally provided on the inner pipe 14 with small pitches.
A plurality of layers (two layers in the drawing) are formed by winding a plurality of metal strips or metal wires (striate bodies) in a spiral shape with a large pitch on top of the inner reinforcing member 16.
It consists of an outer reinforcing member 18, and a plastic sheath 20 provided over the outer reinforcing member 18 and the reinforcing member 18 (see FIG. 2). Furthermore, the terminal fitting 10 attached to the fluid transport pipe 12 includes a terminal fitting main body 22 which is liquid-tightly mounted on the inner pipe 14 exposed at the end 12a of the fluid transport pipe 12, and a gasket holder attached to the terminal fitting main body 22. It consists of an outer case 24 mounted across the metal fittings. The terminal fitting main body 22 has a flange 22a to be attached to a device (not shown), and the outer case 24 has an inward flange 24a with an inner diameter sufficiently larger than the outer diameter of the sheath 20 of the fluid transport pipe 12, as shown in the figure. .

A compressible sheath holder 38 is used to hold the end of the sheath 20;
8 preferably comprises a split crimp sleeve and is attached to the sheath 20 by compression or the like so as to hold the end of the sheath 20 of the fluid transport tube 12. Further, as will be described later, the inward flange 24a of the outer case 24 is fluid-tightly connected to a gasket receiving fitting 28 which is engaged with the sheath holder 38 and is fluid-tightly attached to the sheath 20 via a sealing member 26 such as an O-ring. Installed.

The two-layer outer reinforcing member 18 exposed at the end of the fluid transport pipe 12 has a plurality of (two in the drawings) outer reinforcing members in front (outside) of the gasket receiving fitting 28, especially as shown in FIG. Each is fixed by a holder 36. More specifically, each outer reinforcing member holder 36 consists of an annular holder (see FIG. 3) with a substantially doglegged cross section attached to the outer reinforcing member 18, and is attached to the corresponding outer reinforcing member 18 of each layer. The portion 18a protruding from the reinforcing member holder 36 is bent along this outer reinforcing member holder 36 and welded to the corresponding outer reinforcing member holder 36, and the two outer reinforcing member holders 36 are fitted into each other in a telescopic manner. The inner outer reinforcing member holder 36 engages with the gasket receiving fitting 28. In the illustrated embodiment, the inner outer reinforcing member holder 36
is further attached to the sheath holder 38 by welding. In FIG. 3, reference numeral 36a indicates a welded portion between the outer reinforcing members 36.

Next, the method for assembling the terminal fitting 10 of the present invention will be described in order. The end of the fluid transport pipe 12 is peeled off in stages, and the inner pipe 14, the inner reinforcing member 16, and the multiple layers of outer reinforcing member 18 are sequentially removed. the outer case 24 is fitted onto the fluid transport pipe 12 in advance,
Keep it well inside the terminal.

After that, as described later, the outer case 24
A gasket receiving fitting 28 is disposed on the sheath 20 of the fluid transport pipe 12 to be attached to the inner surface of the inward flange 24a of the fluid transport pipe 12 via a sealing member 26 such as an O-ring. As already mentioned, the end of the sheath 20 is covered with the compressible sheath holder 38, and is held tightly by compression thereof. Gasket receiving fitting 28 is arranged to engage with this sheath holder 38.

At the rear (inside) of this gasket receiving fitting 28, the gasket 30 is tightened via a washer 32 by a gasket tightening fitting 34 which is screwed into the threaded recess 28a of the gasket receiving fitting 28, and the gasket receiving fitting 30 is tightened with this gasket fitting. Sheath 2 by 30
0 in a liquid-tight manner.

Further, at the front (outside) of the gasket receiving fitting 28, the inner outer reinforcing member holder 36 is fitted onto the corresponding outer reinforcing member 18 of the outer layer and the sheath holder 38, and is temporarily welded to the sheath holder 38. This inner outer reinforcing member holder 36 can therefore be concentrically attached to the fluid transport tube 12 via the sheath holder 38.

Thereafter, each strip of the portion 18a of the outer layer outer reinforcing member 18 protruding outward from the holder 36 is bent so as to be aligned with the outer peripheral surface of the inner outer reinforcing member holder 36, and fixed by welding to the outer reinforcing member holder 36. do.

Next, the outer outer reinforcing member holder 36 is telescopically fitted onto the inner outer reinforcing member holder 36 and fixed to the inner outer reinforcing member holder 36 by welding. Therefore, the outer reinforcement holder 36 can also be attached concentrically to the fluid transport tube 12.

The outer layer of the outer reinforcing member 18 is bent so that each strip of the portion 18a protruding outward from the outer reinforcing member holder 36 is aligned with the outer peripheral surface of the outer reinforcing member holder 36 . Weld and fix.

After the welding and fixing work of all the outer reinforcing members 18 is completed in this way, the temporary welding part between the inner outer reinforcing member holder 36 and the sheath holder 38 is removed, and the inner outer reinforcing member holder 36 and sheath holder are Release the fixed state with 38.

Next, the terminal fitting main body 22 is attached to the inner pipe 1.
4 and fixed to the terminal fitting main body 22 by screws 42.
The gasket 40 is tightened to maintain the terminal fitting main body 22 on the inner pipe 14 in a liquid-tight manner. Note that this gasket tightening fitting 44 also extends over the end of the inner reinforcing member 16 .
Fix the ends of the

Finally, the outer case 24, which has been brought sufficiently inward in advance, is straddled over the terminal fitting body 22 and the gasket holder 28 so as to surround the fixed portions of the inner and outer reinforcing members 16, 18. Pull back. In this case, a sealing member 46 such as an O-ring is attached to the outer periphery of the terminal fitting main body 22, and a sealing member 26 such as an O-ring is also attached to the outer periphery of the gasket receiving fitting 28, and the outer case 24 seal member 46,
26 to the terminal fitting main body 22 and the gasket receiving fitting 28 in a liquid-tight manner.

Note that the inward flange 24 of the outer case 24
a slides the outer reinforcing member holder 36 to the left in FIG.
The axial tension acting on the fluid transport pipe 12 is reliably received by the outer reinforcing member 18, and the fluid transport pipe 12
It is possible to securely hold the

In the embodiment shown in FIG. 2, the outer reinforcing member 18 has two inner and outer parts.
The outer reinforcing member 18 of each layer is composed of a plurality of filaments, the outer reinforcing member 18 of the outer layer is fixed to the inner outer reinforcing member holder 36 by welding, and the outer reinforcing member 18 of the inner layer is fixed to the inner outer reinforcing member holder 36 by welding. Although the outer reinforcing member 18 is fixed to the outer outer reinforcing member holder 36 by welding, the outer reinforcing member 18 may have a single layer structure. When the outer reinforcing member 18 has a single layer structure,
Adjacent filament bodies of the outer reinforcing member 18 are alternately fixed to the inner and outer outer reinforcing member holders 36 by welding. This is preferable because the welding space for the outer reinforcing member 18 is widened and the welding work can be performed easily and reliably, improving reliability.
What should be noted with this method is the outer case 24.
does not interfere with the sheath 20 of the fluid transport pipe 12, and since only the short gasket receiving fitting 28 interferes with the sheath 20 of the fluid transport pipe 12, the surface finish length of the sheath can be shortened.

(Effects of the Invention) According to the present invention, as described above, since the gasket holder is separated from the outer case and becomes a separate body, the outer case has a large inner diameter.
Therefore, the length of the surface finish of the sheath can be shortened by the length of displacement of the gasket receiving fitting, which has the practical advantage of being able to attach the outer case to the fluid transport pipe with high workability and a high sealing effect.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a fluid transport pipe end fitting assembled by the method of the present invention, Fig. 2 is a side view of the exposed end of the fluid transport pipe, and Fig. 3 is a sheath and outer surface of the fluid transport pipe. FIG. 3 is an enlarged cross-sectional view of one half of the fixed portion of the reinforcing member. 10...Terminal fitting, 12...Fluid transport pipe, 12
a...terminal, 14...inner pipe, 16...
Inner reinforcing member, 18... Outer reinforcing member, 20... Sheath, 22... Terminal fitting body, 24... Outer case, 26, 46... Seal member, 28... Gasket holder, 30... Gasket, 34 ,44
...Gasket tightening fitting, 40...Shield gasket.

Claims (1)

[Claims] 1. An inner reinforcing member spirally provided on the inner pipe with small pitches, and a plurality of outer reinforcing members formed by winding a plurality of filaments in a spiral shape with large pitches on the inner reinforcing member. and a sheath provided on the outer reinforcing member; a terminal fitting body that is liquid-tightly attached to the inner pipe exposed at the end of the fluid transport pipe; and a sheath of the terminal fitting body and the fluid transport pipe. and an outer case that is fluid-tightly mounted across the fluid transport pipe, the outer case having an inward flange having an inner diameter larger than the outer diameter of the fluid transport pipe, A gasket holder is disposed on the sheath of the fluid transport pipe, and is to be fitted in advance onto the fluid transport pipe and then attached to the inner surface of the inward flange of the outer case via a sealing member, and the gasket holder is arranged on the sheath of the fluid transport pipe. The gasket, which is engaged with a sheath holder that holds the end of the sheath of the fluid transport tube and is provided between the gasket holder and the sheath, is tightened by a gasket tightening fitting attached to the gasket holder to tighten the gasket to the sheath. A plurality of outer reinforcing members are provided on the outer reinforcing member and are attached to the gasket receiving fitting in a liquid-tight manner, and a plurality of outer reinforcing members are exposed at the end of the fluid transport pipe between the terminal fitting main body and the gasket receiving fitting. It is bent along the outer reinforcing member holder to be engaged and welded and fixed to the outer reinforcing member holder, and a shield gasket is disposed between the terminal fitting main body and the inner pipe, and the shield gasket is attached to the terminal fitting. The terminal fitting body is liquid-tightly fixed to the inner pipe by tightening with a gasket tightening fitting fixed to the main body, and finally the outer case is straddled between the terminal fitting body and the gasket receiving fitting. 1. A method of assembling a fluid transport pipe, which comprises pulling the pipe back and tightening the end fitting main body and the gasket receiving fitting in a fluid-tight manner through a sealing member.