Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1982-05-04
1985-04-30
Simmons, David
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
29452, 138144, 138153, 138172, 138DIG2, 138DIG5, 156162, 156165, 156172, 156187, 220 3, B65H 8108
Patent
active
045142459
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of reinforcing a hollow cylindrical body such as a piping or a container intended to be used under pressure.
Several methods for the external reinforcement of pipings or cylindrical containers, such as steel pipes or containers, are known to the applicant.
According to one of these methods, highly resistant hoops or steel wires are wound onto pipes or containers to be reinforced, with or without applying tension to the hoops or wires.
By applying such wires, the resistance of the pipe or the container against outwardly directed pressures is increased. Pipings or containers reinforced in this manner are however difficult to protect against corrosion as the windings are fixed to the reinforced body only at the ends thereof. glass fibres embedded in a layer of liquid, or a partially polymerised layer of resin are wound onto the piping or container. The complete polymerisation of the resin is then obtained in an oven.
The type of glass fibres known to be used can only be wound with a low tension applied to the glass fibres. Taking into account the difference in tensile modulus between, in the most common case, steel and glass, a significant hydraulic expansion of the reinforced body is required in order to make full use of the resistance of the glass.
The winding of glass fibres embedded in a synthetic resin, however, provides excellent protection against corrosion since fibres are made effectively integral with the body which is reinforced over its entire surface.
The aim of the present invention is to provide a method of reinforcing a hollow cylindrical body whereby the resistance of the hollow body against internal pressure is improved, and which will be easy to perform and which uses the permissible resistance of the fibres to its maximum without any expansion of the reinforced body.
According to the invention there is provided a method of reinforcing a hollow cylindrical body which includes winding onto the hollow body in substantially contiguous spires, a flexible strip and fixing the strip to the hollow body, the strip being of a material having a tensile limit higher than that of the material the hollow body is made of, and being wound onto the hollow body under a tension which is sufficient such that the stresses which may occur in the body and in the windings of the strip reach their permissible maximum limits substantially at the same time, when the body is placed under pressure.
In optimum conditions, the effective resistance of the material of which the strip is made is therefore employed and the expansion of the hollow body which, in practice causes many disadvantages, in in this manner avoided.
According to a preferred arrangement of the method, the strip used is made of fibres embedded in a completely polymerised synthetic resin, said fibres extending in the longitudinal direction of the said strip.
The strip is suitably adapted for the reinforcement of steel pipings or containers. In fact, the said strip of fibres embedded in a completely polymerised resin offers a tensile limit very much higher than that of steel, so that it is possible to wind the said strip onto pipings or containers applying a relatively high tension, significantly less, however, than the permissible stress limit for such a strip.
Furthermore, the fixing of such a strip onto the piping or the container can be carried out very easily, for example, by gluing or thermo-fusion, as long as the resin used is a thermo-plastic resin.
The invention also extends to a strip for the implementation of the method in accordance with the invention.
According to another advantageous embodiment of the invention, the strip may contain at least 50% by volume of mineral fibers embedded in a polymerized synthetic resin. Such a strip has a high tensile strength and allows, at the same time, an external coating to be obtained which insulates the pipe reinforced from the environment.
The invention extends furthermore to a piping reinforced externally on account of a winding applied by means of the above-described
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Coflexip
Simmons David
Spie-Batignolles
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