RU2435093C2 - Device for protection of rubber collar and procedure for its assembly on crossing pipeline laid under engineering structure and water obstacles - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: device is made of two fibreglass-plastic half-cases with their small diametre set on pipeline, while with their bigger diametre - on a jacket (case). Two and more external cylinder surfaces are made on the side of a bigger diametre. One and more external cylinder surfaces connected with conic surface are made on the side of a smaller diametre. Cylinder surfaces form webbing, which strengthens half-cases. A concave part eliminating loads at impact with soil during trench refilling is made between cylinder surfaces. An L-shape shelf is made along perimeter of split of the upper half-case. At assembly a shelf of the lower half-case enters the L-shape shelf with slight tightness. A main is pulled into the jacket (case) for assembly of the device. The rubber collar is installed and fixed with clamps-tie rods on the jacket (case) and the pipeline. The upper half-case with rubber cords glued on end sides into seats is lowered from top on surface of the collar assembly. The lower half-case with glued rubber cords is brought closer from beneath and tightened with bolts with the upper half-case, preliminary laying the rubber cord between shelves of half-cases. Closure of ends of rubber cords is controlled when half-cases are pulled together.

EFFECT: simplified assembly, increased strength of device for protection of rubber collar.

Description

The invention relates to transitions of trunk pipelines laid under roads and railways, as well as under engineering structures and water barriers in a protective casing (case), and can be used to protect rubber cuffs that seal the annular space with linear extension of the main pipeline during a rise or lowering seasonal temperatures and the temperature of the pumped product, as well as to protect the cuff from shocks and soil pressure when backfilling the trench during the construction period Twa, operation and maintenance of crossings.

The invention is mainly intended to protect a rubber cuff with a diameter of 57-1420 mm for trunk pipelines and a diameter of 219-1720 mm for casings (cases).

A device for protecting a rubber cuff of transitions of main pipelines (see patent RU No. 2276753 dated 01.12.2004) is made detachable in the form of upper and lower half-shells with shelves at the junction and in the assembly, consisting of two cylindrical parts and a conical connecting them parts. The device is fixed on the thrust ring of the protective casing (case) and rests on the main pipeline. In the lower half-shell there are two radius plates sealing the connector.

This device for protecting the rubber sleeve is difficult in terms of manufacturing the design of the thrust ring on which the device for protecting the rubber sleeve is fixed. In addition, the thrust ring does not provide proper tightness during installation and during operation. In the front cylindrical part of the device between the inner and outer sides resting on the main pipeline, several rubber sealing cords are laid to create tightness. In the back of the device, between the inner and outer sides, several rubber cords are also laid.

This design of a device for protecting a rubber cuff increases the cost of its manufacture, requires a significant investment of time for installation on a pipeline and a casing (case).

The objective of the invention is to develop a device design, mainly made of fiberglass, to protect the rubber cuff, characterized by ease of manufacture, structurally uncomplicated, providing minimal time for assembly and disassembly on the main pipeline of the transition and on the casing (case) without a thrust ring, and also increased strength and reduced manufacturing costs by eliminating the thrust ring.

The essence of the invention lies in the fact that the device for protecting a rubber cuff made of a thrust ring consists of two half-shells, mainly of fiberglass, installed with a small diameter on the main pipeline and a large diameter on the casing (case). The device is sealed with sealing cords. From the side of the larger diameter, two or more outer cylindrical surfaces are made in steps, and from the side of the small diameter, one or more outer cylindrical surfaces are made in steps. A concave part is made between the cylindrical surfaces to relieve stress upon impact, the end parts of the larger and smaller diameters are conical and contain side walls, the second side walls are made in the inner part of the smaller and larger diameters, which serve as seats for laying rubber cords on the inner surface for sealing the annulus of the transition.

In place of the upper half-shell connector, a L-shaped shelf is made with its bend towards the lower half-housing along the entire perimeter, into which a horizontal shelf of the lower half-shell of the device is inserted with interference. The shelves on the half-shells are provided with holes, for example, for bolted connections.

A rubber cord is laid between the shelves of the half-shells to seal the connector. The bending of the L-shaped shelf of the upper half-housing towards the lower half-housing prevents squeezing the harness outward at the moment of tightening the upper and lower half-bodies and reliably seals the space between the device and the rubber cuff at the connector.

The concave surfaces of the half-shells relieve stresses when impacted by soil when backfilling the trench during the construction of the transition.

The essence of the method of assembly of the device is that they preliminarily drag the main pipeline into the casing (case). Then, a rubber cuff is mounted on the pipeline and dragged to the end of the casing (case) and secured with cable ties to the casing (case) and the pipeline.

Having performed this operation, they take the upper half-case with rubber cords glued from the inside ends to the seats, bring them to the designated points of contact with the main pipeline and the casing (case) and lower it from above to the surface where the rubber cuff is mounted so that it is located in the center of the lower upper half-housing. Then, holding the upper half-shell on the main pipeline and the casing (case), take the lower half-shell with similarly glued cords as the upper half-shell, and lead from the bottom to the upper half-shell, after laying a rubber cord between the shelves of the connection of the half-shells. The horizontal shelf of the lower half-shell enters with an interference fit into the space formed by the L-shaped shelf of the upper half-shell. After that, the holes in the shelves of the upper and lower half-bodies are combined and tightened with tightening bolts between them. When tightening the half-shells, the closing of the ends of the rubber cords of the upper half-shell to the lower is controlled so that the closing of the ends of the cords of the upper half-shell to the lower is strictly centered to reliably seal the annulus of the transition at the junctions of the rubber cords. After crimping bolt joints of the half-shells, a visual inspection of the rubber cords is carried out around the entire perimeter of the end sides of the device. If the rubber cords are compressed along the entire perimeter evenly, then the device is considered mounted.

The invention is illustrated by drawings, where:

- figure 1 shows a device for protecting a rubber cuff

on the transition pipeline;

- figure 2 is a section aa of figure 1;

- figure 3 shows the claimed device, illustrating

way to assemble it.

The proposed device for protecting the rubber cuff 1 (Fig. 1, 3) on the pipeline 2 (Fig. 1, 3) of the transition is made of two half-shells: the upper half-shell 3 (Figs. 1, 2, 3) and the lower half-shell 4 (Fig. 1 , 2, 3), which are made mainly of fiberglass.

When assembled, the device forms two diameters: the larger and the smaller. Small diameter device is installed on the pipe 2, with a larger diameter on the casing (case) 5 (Fig.1, 3). From the side of the larger diameter, two or more outer cylindrical surfaces 6 (Fig. 1) are made stepwise, and from the side of the small diameter, one or more outer cylindrical surfaces 7 (Fig. 1) are made. Between the cylindrical surfaces 6, 7, a concave part 8 is made (Figs. 1, 3) for relieving stress upon impact. The end parts of small and larger diameters are made on a cone and contain side walls 9, 10 (Figs. 1, 3). In the inner part of the smaller and larger diameters, the second side walls 11, 12 are made (Fig. 1). The space between the walls serves as seats for laying the rubber cords 13, 14 (Fig.1, 3) in the inner part of the half-shells 3, 4 of the device for sealing the annulus of the transition.

Along the perimeter of the connector of the upper half-shell 3, a L-shaped shelf 15 (Figs. 1, 2, 3) is made with a bend 16 (Fig. 2) towards the lower half-shell 4. The L-shaped shelf 15 of the upper half-shell 3 forms a space into which tightness during assembly includes a horizontal shelf 17 (Fig.2, 3) of the lower half-housing of the device. Between the shelves 15, 17 of the half-shells 3, 4 a rubber cord 18 is laid (Fig. 2, 3) to seal the connector. Holes 19 (FIG. 3) are coaxially made in the shelves 15, 17 for the bolted connection 20 (FIGS. 1, 2, 3) of the upper and lower half-shells during their assembly at the transition of the pipeline. The inventive device mounted on the pipeline 2 and on the casing (case) 5 reliably protects the rubber cuff from shock during the construction of the transition pipeline, provides reliable sealing of the space between the cuff 1 and the device due to the L-shaped shelf 15 and shelf 17, between which a rubber cord is laid 18, which when pulling together the half-shells is not squeezed beyond the edges of the shelves.

Sealing the annular space is also ensured by fixing the cuff 1 with clamps-ties 21, 22 (Fig. 1, 3) on the pipe 2 and the casing (case) 5.

The method of assembly of the device on the transition pipeline is as follows.

Pre-pull the main pipe 2 into the casing (case) 5. Then, the rubber sleeve 1 is mounted on the main pipe 2 and move it further to the casing (case) 5. Then fix it with tie clamps 21, 22 on the casing (case) and on the main pipe , thereby sealing the annulus of the transition.

To perform this operation, take the upper half-case 3 with rubber cords 13, 14 glued from the inner end side, bring it to the points of contact with the main pipeline 2 and the casing (case) 5, which are further outlined, and apply it to the surface where the rubber sleeve 1 is mounted with this design so that the rubber sleeve 1 is located in the center of the lower upper half-shell 3 of the device. Then, holding the upper half-shell 3 from above on the main pipeline 2 and the casing (case) 5, take the lower half-shell 4 with similarly glued rubber cords 13, 14, as with the upper half-shell 3, and apply it to the upper half-shell 3, after laying the rubber cord 18 between the shelves 15, 17 of the connection of the half-shells. The horizontal shelf 17 of the lower half-shell is an interference fit in the L-shaped space of the upper half-shell 3.

After that combine the holes 19 in the shelves of the upper half-shell 3 and the lower half-shell 4 and tighten them with the coupling bolts 20 together. When tightening the half-shells, the closing of the ends of the rubber cords 13, 14 of the upper half-shell 3 with the lower half-shell 4 is controlled so that the closing of the ends of the cords is strictly centered relative to each other for reliable sealing of the space between the cuff and the inner part of the device for protecting it.

After crimping 20 half-shells with bolted connections, a visual inspection of the rubber cords 13, 14 is carried out along the entire perimeter of the end faces of the device. If the ends of the rubber cords 13, 14 are compressed in the center and along the entire perimeter evenly, then the device is considered mounted.

The proposed device operates as follows.

At the end of the installation, the device for protecting the rubber cuff 1 is covered with soil. When filling the trench with mixed soil, where there are stones, cobblestones, frozen soil, blocks of 60 kg or more, all this, hitting the device, is shock-absorbed by rubber cords 13, 14, 18 and does not damage the device to protect the rubber cuff 1, and therefore Rubber cords protect it from tearing and ground pressure. In addition, the device for protecting the rubber cuff 1 makes it possible for the rubber cuff 1 to deform freely in the protective space of the device when seasonal temperatures change or when the temperature of the pumped product changes at the time of the linear extension of the main pipeline 2.

The invention is simple in design, it provides free installation or its dismantling on the main pipeline 2 and without a thrust ring on the transition casing (case) 5, and also reliably protects the rubber sleeve 1 from moisture entering the annulus of the transition.

In addition, it provides reliable sealing of the annulus of the transition and increase the strength of the device due to the design of the shape of the half-shells of the device and the creation of a shock-absorbing effect due to the rubber cords 13, 14, 18, thereby preventing the destruction of the device from impacts during filling the pipeline transition trench during construction and further reliable operation.

Tests of the device to protect the rubber cuff on the transition pipeline showed good results, which helps to extend the life of the pipeline transitions under roads and railways, as well as under water barriers and engineering structures.

Claims (4)

1. A device for protecting a rubber cuff on a transition pipeline laid under engineering structures and water barriers using a protective casing (case), consisting of two half-shells mainly made of fiberglass, installed with a small diameter on the main pipeline and a large diameter on the casing (case), sealed with sealing cords, characterized in that on the larger diameter side, two or more outer cylindrical surfaces are made stepwise, and on the small diameter side meters, one or more outer cylindrical surfaces are made in steps, a concave part is made between the cylindrical surfaces to relieve stress upon impact, the end parts of the larger and smaller diameters are conical and contain side walls, the second side walls are made in the inner part of the smaller and larger diameters, which serve seats for laying rubber cords on the inside to seal the annulus of the transition. 2. The device according to claim 1, characterized in that in the place of the upper half-shell connector, a L-shaped shelf is made with a bend towards the lower half-housing along the entire perimeter, into which a horizontal shelf of the lower half-shell includes an interference fit. 3. The device according to claim 2, characterized in that the shelves on the half-shells are provided with holes, for example, for bolted connections. 4. A method of assembling a device for protecting a rubber cuff on a trunk pipeline, fixed at one end on the pipeline and the other on a casing (case), characterized in that the main pipeline is previously pulled into the casing (case), then the rubber cuff is mounted on it by dragging it through the main pipeline to the casing (case), fix on the pipeline and casing (case) with tie clamps, then take the upper half-case of the device with pre-glued rubber cords in the seats x from the inner end sides and lower it from above onto the surface where the rubber cuff is mounted, so that the rubber cuff is in the center of the lower upper half-shell and, holding the upper half-shell on the pipeline and the casing (case), take the lower half-shell with similarly glued cords , as in the upper half-shell, and apply it to the upper half-shell, preliminarily laying a rubber cord between the shelves of the connection of the half-shells, while the horizontal shelf of the lower half-shell comes with tension homo into the space formed by the L-shaped shelf of the upper half-housing, combining the holes in the shelves of the upper and lower half-bodies, tighten them with tightening bolts, control the closing of the ends of the rubber cords of the upper half-case, ensuring that the closing of the ends of the cords is strictly centered for reliable sealing the space between the cuff and the inside of the device to protect it.

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