JPH0440593B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the terminal fittings of high-pressure fluid transport pipes such as oil pipes and water pipes installed on the seabed.

High-pressure fluid transport pipes of this type generally consist of a plastic pipe, an inner and outer metal reinforcing layer on the plastic pipe, and a plastic jacket on the outer metal reinforcing layer. The fluid transport pipe has an end fitting for connecting its end to equipment or the like. A prior art terminal fitting consists of a fitting body that is liquid-tightly fitted to the exposed end of a plastic pipe of a fluid transport pipe, and a cap that is liquid-tightly fitted to a plastic jacket and screwed onto the fitting body. , the outer metal reinforcing layer is fixed by a collar in the space between the fitting body and the cap, the inner metal reinforcing layer is exposed in the space, and a filler such as epoxy resin is placed in the space. Filled and formed. However, the end fittings of this prior art may be damaged if the filler is insufficiently filled or if there are cavities in the filler, or if the transport fluid is at a very high temperature and the compressive strength of the filler is reduced. If the compressive strength of the filler is reduced due to shock during installation, the end of the metal reinforcement layer may become abnormal in the space between the collar that fixes the outer metal reinforcement layer and the fitting body. It had the disadvantage that it was easily destroyed by internal pressure.

An object of the present invention is to provide an end fitting for a high-pressure fluid transport pipe that can prevent destruction due to such internal pressure.

Embodiments of the present invention will be described in detail with reference to the drawings. The drawings show an end fitting 10 of a high-pressure fluid transport pipe according to the present invention, and a high-pressure fluid transport pipe 12 is connected to a plastic pipe 14 and a top of the plastic pipe 14. It consists of inner and outer metal reinforcing layers 16, 18 provided and a plastic jacket 20 placed on the outer metal reinforcing layer 18. In the illustrated embodiment, the inner metal reinforcing layer 16 includes a first layer 16a formed by spirally winding a metal band with a substantially U-shaped cross section, and a metal band with a substantially inverted U-shaped cross section on top of this first layer. A second layer 16b is formed by spirally winding the metal strips of the first layer so as to straddle adjacent turns and mesh with each other. It is formed by spirally winding two layers with a pitch larger than that of layer 16.

The terminal fitting 10 is liquid-tightly fitted to the exposed end 14a of the plastic pipe 14 of the fluid transport pipe 12, and a fitting body 22 is liquid-tightly fitted to the end of the plastic sheath 20, and is screwed onto the fitting main body 22. It consists of a combined cap 24. The liquid tightness between the fitting body 22 and the plastic pipe 14 and between the cap 24 and the plastic jacket 20 is compressed by plugs 26, 28 arranged therebetween and screwed to the fitting body 22 and the cap 24. It is maintained by seal rings 30, 32. In the space 23 between the fitting body 22 and the cap 24, the outer metal reinforcing layer 18 is connected to the inner and outer collars 34, 36, 3.
4', 36', and the ends of the inner metal reinforcing layer 16 are exposed in stages. The space 23 is filled with a filler 38 such as epoxy resin. The collars 34 and 36 fix the metal strips or metal wires on the inside of the outer metal reinforcing layer 18, and the collars 34' and 36' fix the metal strips or metal wires on the outside by shifting them in the axial direction from the collars 34 and 36. is fixed. Of course, the metal strips or wires inside and outside the outer metal reinforcing layer 18 may be secured together by the collars 34, 36. The ends of the metal strips or wires of these outer metal reinforcing layers 18 are also folded back in a U-shape around the collars 34, 34' and attached to their own metal strips or wires by binding wires. The folded ends of the collars 36, 36' are fixed to the collars 34, 34' by welding at the same time as the folded ends.
Collar 3
4, 34' is firmly fixed. In addition, in the illustrated enforcement order, the folded end of the metal strip or metal wire of the outer metal reinforcing layer is fixed to the metal strip or metal wire itself by winding a bind wire and welding. It may be fixed by welding to the collars 34, 34'.

In the terminal fitting 10 of the present invention, a reinforcing ring 40 is arranged between the end surface of the fitting main body 22 and the collar 34 on the inner metal reinforcing layer 16 exposed in the space 23, and the filler 38 is applied to this reinforcing ring. It is filled to bury 40. In addition to metal, the reinforcing ring 40 can be made of a material with high mechanical strength such as plastic or fiber-containing hardened resin. As shown in FIG. 2, the reinforcing ring 40 includes a first adjustment ring portion 42 that has a concave surface 42a along the end surface of the collar 34 and engages with the collar 34, and this adjustment ring portion 4.
2, and a second adjusting ring portion 44 that engages with the end face of the plug 26 that is attached to the fitting body 22 and becomes a part of this fitting body 22, and therefore, the first and second adjustment ring portions By adjusting the threading of the adjustment ring parts 42 and 44, the axial length can be adjusted and the plug 2 can be adjusted.
6 and the collar 34.

Curvature diameter of concave surface 42a of first adjustment ring portion 42
R′ is the sum of the radius of curvature R of the lower surface of the collar 34 and the thickness t1 of the inner layer of the outer metal reinforcing layer 18.
As mentioned earlier, when the inner and outer metal strips or metal wires of the outer metal reinforcing layer 18 are fixed together using the collars 34 and 36, the radius of curvature R' of the concave surface 42a is equal to R, t1, and the outer metal strip or wire. This is the sum of the layer thickness t2. Incidentally, as can be seen from FIG.
It has a relief 40a on the side. Further, as can be seen from FIG. 2, a through hole 44a passing through the second adjustment ring portion 44 in the radial direction is provided, through which the inner metal reinforcing layer 16 is inserted between the reinforcing ring 40 and the plastic pipe 14. A soft metal 45 such as plastic or lead is molded so that it is embedded. In addition, packing 4 is provided on the surface that engages with the plug 26.
6 is provided with a packing groove 44b into which it engages. In this way, the metal fitting body 22 and the collar 3
4 is reinforced by the reinforcing ring 40, so even if the filler 38 is insufficiently filled or a cavity occurs, or even if high-temperature fluid passes through it or shock is applied during installation, the filler will remain intact. 38 without reducing its compression resistance, especially the adjustment ring 40 and the plastic pipe 1.
Since a plastic or soft metal mold is provided between the collar 34 and the inner metal layer 16 to bury the inner metal layer 16, a gap is relatively easily formed between the collar 34 and the inner metal layer 18 due to the folding of the outer metal reinforcing layer 18. The corners of the space between the reinforcing layer 16 are reinforced and the internal pressure resistance does not deteriorate. In addition, the first part of the reinforcing ring 40
The adjustment ring portion 42 has its concave surface 42a aligned with the collar 34.
Since the reinforcing ring 40 is engaged with the collar 34 and bites into the lower side of the collar, even if large internal pressure from the plastic pipe 14 is applied, the reinforcing ring 40 is suppressed from expanding outward by the collar 34, and the internal pressure resistance is significantly improved. can be improved. The terminal fitting 10 is manufactured by fitting the plug 28, cap 24, and collars 36, 36' into the fluid transport pipe 12, peeling off the end of the fluid transport pipe 12, and attaching the collar 34 on the outer metal reinforcing layer 18. ，
34' and collars 34, 36, 34', 3
Fixing of the outer metal reinforcing layer 18 at 6', reinforcing ring 40
, fixing the metal fitting body 22, adjusting the axial length of the reinforcing ring 40, molding the space inside the reinforcing ring 40, fixing the cap 24, and fixing the plug 28, and finally filling the filler 38. and then assembled.

According to the present invention, as described above, the reinforcing ring is disposed between the collar holding the folded portion of the outer metal reinforcing layer and the metal fitting main body, and closely contacts the collar and the metal fitting main body, respectively, and cooperates with the collar. Since the space between the metal fitting body and the collar inside the cap is reinforced by the collar and the reinforcing ring, the space between the metal fitting body and the collar will not be destroyed by the internal pressure from the plastic pipe. In particular, since the mold is formed so as to bury the inner metal reinforcing layer inside the reinforcing ring, the internal pressure resistance can be significantly improved. Furthermore, since the outer metal reinforcing layer is folded back along the collar and fixed to this collar, even if tension is applied to this outer metal reinforcing layer, the tension is absorbed by the collar. The tensile strength of the fluid transport pipe is not impaired, and therefore the properties of the fluid transport pipe are not deteriorated.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the upper half of the end fitting of a high-pressure fluid transport pipe according to the present invention, and FIG. 2 is a vertical cross-sectional view of the upper half of the metal reinforcing ring used in the present invention. 10... Terminal fitting, 12... High pressure fluid transport pipe,
14...Plastic pipe, 16, 18...Inner and outer metal reinforcing layers, 20...Plastic jacket, 2
2...Bracket body, 24...Cap, 34,3
6, 34', 36'...color, 38...filler,
40... Reinforcement ring, 42... First adjustment ring portion, 4
2a...Concave surface, 44...Second adjustment ring portion, 45
...molded plastic or soft metal.

Claims (1)

[Claims] 1. At the exposed end of the plastic pipe of a high-pressure fluid transport pipe consisting of a plastic pipe, inner and outer metal reinforcing layers provided on the plastic pipe, and a plastic jacket provided on the outer metal reinforcing layer. It consists of a metal fitting body that is fitted in a liquid-tight manner and a cap that is liquid-tightly fitted into the plastic jacket and screwed onto the metal fitting body, and the end of the outer metal reinforcing layer is connected to the metal fitting body and the cap. a high-pressure fluid that is folded around the collar in a space between and secured to the collar, an end of the inner metal reinforcing layer being exposed in the space and a filler filling the space; In the terminal fitting of a transport pipe, the fitting body and the collar are connected between the fitting body and the collar on the end of the inner metal reinforcing layer exposed in the space between the fitting body and the cap. A reinforcing ring is disposed in close engagement with a first adjusting ring portion having a curved concave surface that engages a curved end surface of the collar across an end of the outer metal reinforcing layer. and a second adjustment ring part that is screwed into the first adjustment ring part and engaged with the metal fitting main body, and the inner metal reinforcement layer is buried between the reinforcement ring and the plastic pipe. 1. An end fitting for a high-pressure fluid transport pipe, characterized in that a mold of plastic or soft metal is provided at the end of the pipe, and the filler is filled so as to embed the reinforcing ring.