RU2094690C1 - Device for joining reinforced plastic pipes - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: device has shells and semi-cylinders provided with collars at their ends. The device for fastening the semi-cylinders is made up as a tube that embraces the semi-cylinders and the ends of the pipe. EFFECT: enhanced reliability. 2 cl, 2 dwg

Description

 The invention relates to the field of connecting means for pipes made of plastics.

 Known flange assembly for connecting pipes made of fiber-reinforced plastic, containing flange bushings mounted on reinforcing shells by means of a round thread, an insert ring between flange bushings, ring elements hermetically fastened to plastic pipes and closing the ends of the pipes, coupling rings with bolts (see, for example U.S. Patent 4,619,470 F 16 L 58/00). Such a device has low reliability and maintainability.

 The low reliability of such a device is explained, firstly, by a significant (> 10) number of technologically complex parts included in the device; secondly, the limited flexibility of the pipeline with such pipe connections during operation (due to the rigid tightening of the joints for sealing and the resulting axial loads along the length of the pipeline in its individual sections), and thirdly, the significant transverse dimensions of the device, reinforcing the axial and bending stresses in the pipeline at temperature differences in it and the environment, as well as other mechanical shifts of the latter.

 The low maintainability of such a device is explained by the lack of access to its sealing elements (in the sealing state), which makes it impossible to repair the device in the field.

 Another device for connecting reinforced plastic pipes is known, comprising half cylinders covering the reinforcing shells of the pipes and a fastening device for the half cylinders (EPO application (EP) N 0152752 class. F 16 L 47/00). On the reinforcing pipes and half cylinders, grooves and grooves are made along a smooth wave-like line; the device for fixing the half-cylinders is made in the form of two clamping conical rings; abutting pipes are hermetically connected by means of a pipe fitting welded to or glued to them from the inside. The device provides a rigid connection of joined pipes in the presence of a gap between their ends.

 This device consists of a significantly smaller number and technologically simpler parts and has smaller transverse dimensions, due to which reliability is slightly increased. The maintainability of the device is improved due to the possibility of access to the sealing element of the connection to the pipe fitting (with the clamping rings and half cylinders removed). However, the achieved positive effect is insufficient, because disadvantages remained due to the rigid connection of the joined pipes.

 The objective of the invention is to increase the reliability of the device.

 To achieve this objective, a device for connecting plastic shells reinforced with shells is improved, comprising half-cylinders covering the shells installed with a gap between the ends, and a half-cylinder fastening device.

 This improvement consists in the fact that the shells and half-cylinders are made with beads at the ends, and the fastening device of the half-cylinders is made in the form of a pipe covering them.

 Plastic pipes can be made with unreinforced shell ends, and the device is equipped with a split ring or winding located between the shells.

 The execution of the shells of pipes and half-cylinders with flanges at the ends, and the fastening devices of the half-cylinders in the form of a pipe enclosing them, provides a “flexible” connection of pipes with the possibility of axial, radial and angular displacement at the joint, due to which the pipe elements self-install under load (during backfilling and operation ), the summation of stresses in individual sections of the pipeline from the loads acting on its other sections is excluded, the operation of the pipeline at minimum stresses in it is ensured and, thereby, reliability increases.

 The execution of plastic pipes with non-reinforced shell ends and the supply of the device with a split ring or winding located between the shells allows to increase the range of self-installation of plastic pipes under load and improve access to the joint during installation (repair) and, thereby, further increase the reliability of the device.

 In FIG. 1 shows a device with reinforced ends of plastic pipes; in FIG. 2 with unreinforced ends of plastic pipes and a different ring (winding).

 A device for connecting plastic pipes 1 and 2, respectively reinforced with shells 3 and 4, installed with a gap 5 between the ends, contains half-cylinders 6 and 7, a fastening device for half-cylinders 6 and 7 in the form of a pipe 8 covering them, a sleeve 9 installed by landing or on glue inside pipes 1 and 2.

 Shells 3 and 4, half-cylinders 6 and 7 are respectively made with shoulders 10, 11 and 12, 13 at the ends; half-cylinders 6 and 7 with gaps cover the shells 3 and 4 with flanges 10 and 11, which makes it possible to self-install pipes under load.

 In the proposed embodiment (Fig. 2), the plastic pipes 1 and 2 are made with unreinforced shells 3 and 4, ends 14 and 15, and the device is equipped with a split ring (or winding) 16 located between the shells 3 and 4, which provides reinforcement of the ends 14 and 15 plastic pipes 1 and 2 and can improve the reliability of the device while expanding the ability of self-installation of pipes.

 The ends 14 and 15 are connected to each other by a weld seam 17. The half-cylinders 6 and 7 and the pipe 8 are made of the same material as the shells 3 and 4, the split ring (or winding) 16 of the material of the plastic pipes 1 and 2 or the shell material 3 and 4. The pipe 8 is fixed to the half cylinders 6 and 7, for example, by means of an adhesive composition. Half-cylinders 6 and 7 to reduce the compliance of the device under load can in some cases be installed on shells 3 and 4 or only on one of them, for example, on shell 3, on the adhesive composition.

 The device operates as follows. In the process of filling the pipeline, shells 3 and 4 with pipes 1 and 2 and pipe 8 (together with half-cylinders 6 and 7 as a whole) are displaced under the action of the soil relative to each other and each individually occupies an equilibrium position in the soil, i.e. with minimal stresses in the pipeline elements.

 During operation of the pipeline under the influence of temperature changes, an independent (not transferred to each other) change in the length of the shells 3 and 4 and the pipe 8 (with half cylinders 6 and 7) occurs, which virtually eliminates the accumulation (summation) of temperature stresses in individual sections of the pipeline from the entire (or significant) of its length.

 The implementation of the device according to the invention increases its reliability, and also provides ease of repair, especially in the field, and, in addition, allows you to lay a pipeline on curved sections of the route without the use of special radius elements.

Claims (2)

 1. A device for connecting reinforced plastic pipes, containing half-cylinders covering the shells installed with a gap between the ends, and a half-cylinder fastening device, characterized in that the shells and half-cylinders are made with beads at the ends, and the half-cylinder fastening device is made in the form of a pipe covering them.  2. The device according to claim 1, characterized in that the plastic pipes are made with unreinforced ends, and the device is equipped with a split ring or winding located between the shells.

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