RU2234025C2 - Layered transformable hose - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: hose has inner layer made of a flexible material, outer layer made of nonwoven material and polymeric reactive or thermoplastic glue. The inner layer is a strengthening one and made of two corrosion protecting metal belts rigidly secured to each other over periphery and is additionally provided with a branch pipe. The polymeric glue is interposed between the inner and outer layers.

EFFECT: enhanced reliability.

10 cl, 5 dwg

Description

The invention relates to devices mainly for underground repair and restoration of the throughput capacity of pipelines for cold and hot water supply, sewer systems, as well as oil and gas pipelines and can be used to prevent and eliminate leakage of pipelines without excavating trenches.

A sleeve is known in the form of a stocking made of synthetic fiber, impregnated with a hardenable binder [The technology of trenchless repair of water supply and sewage pipelines came to Russia. Pipelines and ecology. - 1998. - No. 2. - S.24-26]. After pulling the stocking in the cavity of the pipeline being repaired, it is straightened until it contacts the inner surface of the pipeline and the curing agent is subsequently cured by suitable methods, as a result of which a strong protective layer is formed on the inner surface of the pipeline made of fiber reinforced polymer material.

The disadvantages of this well-known sleeve are limited safety before use as a result of gradual curing of the binder, high energy consumption during prolonged curing of the binder, difficulties with the technical equipment of the repair process. This sleeve, based on the most suitable binders for its manufacture, cannot be used to supply drinking water.

A known method of producing a layered layered sleeve from a layer of synthetic fibrous material impregnated with a curable binder, and an outer shell of a polyethylene or polyvinyl chloride film [British Patent No. 1449455, class. F 16 L 55/18, 1976]. A well-known sleeve is introduced into the pipeline under repair by turning inside out according to the stocking principle, in which a layer of fiber-impregnated binder is pressed against the inner surface of the pipeline being repaired, and the film layer becomes internal in the restored pipeline. Due to its flexibility, the well-known sleeve is well adapted to the shape of the pipeline being repaired and can be suitable for repairing pipelines of various diameters.

This well-known sleeve has several disadvantages. It has limited safety before use as a result of the gradual curing of the binder. With prolonged curing of the binder, a large expenditure of energy takes place. Due to the presence on the inner surface of the inverted sleeve of the polymer film, it can be used to repair only a limited number of types of pipelines. To implement the method of eversion, complex technical equipment is required.

Known layered layered and able to transform into a cylinder sleeve [US Patent No. 5931199, class. F 16 L 55/18, 1998], having an inner layer of flexible material, an outer layer of predominantly fiberglass impregnated with a liquid polymer. The curing of this polymer with radial expansion of the sleeve in the pipe, which is carried out under pressure until its outer surface comes into contact with the inner surface of the pipe, ensures the fixing of the sleeve.

The disadvantages that impede the use of this invention include the low sanitary and hygienic characteristics due to the chemical nature of the starting materials of the sleeve, the impossibility of overlapping defects of the large size of the repaired pipe, and the insufficiently high rate of gluing of the sleeve.

The closest invention to the claimed combination of essential features is the invention according to US patent No. 5931199, which is selected as a prototype.

Thus, the task to which the invention is directed is to increase the strength of the sleeve, accelerate and simplify its installation in the repaired pipeline by the method of trenchless repair of pipelines of various diameters, ensuring the suitability of the repaired pipeline for supplying various media, including drinking water.

The invention is directed to the solution of the problem. Its essence lies in the fact that it provides high sleeve strength, reinforcing the repaired pipeline and overlapping large defects without violating the geometry of the pipe, resistance to the action of a number of chemically active media, the possibility of supplying drinking water through the pipeline, as well as easy transformation of the sleeve into a cylinder in the cavity the pipeline and the high speed of gluing the sleeve due to the possibility of applying a high processing temperature, as well as gluing to a wet pipe, since water at high temperature Heat treatment quickly removes from the bonding area. The high uniformity of the distribution of glue and the absence of its overflow during the process of pulling the sleeve determine a sufficiently high adhesion of the sleeve. It is possible to use almost any type of glue.

The specified technical result when using the present invention is achieved in that the layered layered and capable of transforming into a cylinder sleeve contains an inner layer of flexible material, an outer layer of non-woven fibrous material and a polymer reactive or thermoplastic adhesive and is characterized in that the inner layer is hardening and polymer glue is placed between the inner and outer layers, while the inner layer is made of two corrosion-resistant metal tapes, interconnected along the perimeter, and is additionally equipped with a fitting. At the same time, known single-component or two-component adhesives are used as a reactive adhesive.

When using a two-component reactive adhesive, layers are made separately from each component, and an intermediate layer is additionally placed between them, which is made of a fusible polymer, for example, a copolyester or copolymer of ethylene, or copolyamide.

Also, foaming glue is used as a reactive adhesive.

Hot melt adhesive is used as the thermoplastic adhesive, while the thermoplastic hot melt adhesive is preferably placed in the longitudinal direction in the form of rods, and in the transverse direction in the form of jumpers.

As a hot melt adhesive, a mixture of bitumen and a secondary thermoplastic is used, for example, secondary polyethylene or a secondary ethylene copolymer, or a secondary styrene copolymer.

The thermoplastic adhesive may further comprise a crosslinking agent.

When using the proposed sleeve at low temperatures, as well as when repairing oil and gas pipelines, it is additionally equipped with electrical contacts located at the ends of the inner layer.

The signs given in the claims are necessary and sufficient to achieve the specified technical result, that is, they are essential.

The proposed invention is not known from available sources of information, it does not explicitly follow from the prior art, and at the same time it is industrially applicable as a universal device, that is, it meets all the criteria of patentability under applicable law.

For the manufacture of sleeves the following materials are required.

Corrosion-resistant steel bands, for example, 12X18H10T, are used as internal flexible layers.

As a nonwoven fibrous material for the outer layers of the sleeve, for example, material based on mylar or other fibers is used (TU-412-854-91, TU 17-52.9814-80).

Almost all known adhesives are used as adhesives: thermoplastic adhesives (hot melt adhesives), reactive adhesives (foaming adhesives, one-component adhesives, two-component adhesives, anaerobic adhesives) [Chemical Encyclopedia: T.2 - M .: Soviet Encyclopedia. - 1990. - S. 406].

For example, polyester hot melt adhesive TF 60 (TU 6-05-211-895-79); hot melt adhesive based on copolyamide 548; bitumen-rubber mastic (TU 38.302-16-385-91 with amendment 1); two-component epoxy adhesives for room curing: K 153 (TU 2225-509-00203521-94), VK 9 (OST 1 90281-86), K 300-61 (OST 6-06-5100-96); anaerobic acrylate adhesives for room curing: two-component Anaterm 106 (TU 6-02-29-96), one-component Anaterm 117 (TU 6-01-2-1304-85); hot-curable one-component epoxy glue VKV 3 hot curing (TU 1-596-386-96).

The invention is illustrated by drawings.

Figure 1 presents a General view of a flat-sleeved sleeve (section); figure 2 shows the placement of the intermediate layer of fusible polymer when using a reactive two-component adhesive; figure 3 shows the preferred placement of thermoplastic hot melt adhesive in the form of rods and jumpers (section); figure 4 - sleeve after transformation into a cylinder placed in the pipeline (section); figure 5 presents a view of one-piece connection of metal tapes in a repaired pipeline.

A layered layered and capable of transforming into a cylinder sleeve, designed to repair the pipeline, using reactive glue contains:

1 - inner layer of corrosion-resistant metal tape;

2 - outer layer of non-woven fibrous material;

3 - polymer reactive glue;

4 - one-piece connection (welding, rolling, etc.);

5 - layers of two-component reactive glue (3);

6 - an intermediate layer;

7 - bar;

8 - jumper;

9 - pipeline;

10 - a layer of non-woven fibrous material, which is impregnated with a polymer adhesive when exposed to elevated temperatures and pressures on the sleeve, after transforming the sleeve into a cylinder.

When using thermoplastic adhesive, the sleeve consists of:

1 - inner layer of corrosion-resistant metal tape;

2 - outer layer of non-woven fibrous material;

3 - polymer thermoplastic adhesive;

4 - one-piece connection (welding, rolling, etc.);

7 - bar;

8 - jumper;

9 - pipeline;

The fitting and electrical contacts are not shown in the figures.

Figure 1 - a layered, flat-folded and able to transform into a cylinder sleeve contains an inner layer 1 of two corrosion-resistant metal tapes, an outer layer 2 of non-woven fibrous material, and between them there is a polymer reactive or thermoplastic adhesive 3, while the metal tapes are inextricably connected between by itself, for example, weld 4.

In Fig. 2, the sleeve also contains an inner layer 1 of a corrosion-resistant metal tape, an outer layer 2 of non-woven fibrous material, and a two-component reactive adhesive is used as the polymer adhesive 3 and layers 5 are made of each component, and an intermediate layer 6 of fusible polymer.

In Fig. 3, the sleeve also contains an inner layer 1 made of two corrosion-resistant metal strips, permanently connected to each other, for example, by rolling 4, the outer layer 2 of non-woven fibrous material, and hot melt adhesive, which is longitudinal in length, is used as polymer adhesive 3 the direction is placed in the form of rods 7, and in the transverse - in the form of jumpers 8.

Figure 4 - section of the repaired pipeline 9, inside which is glued transformed into a cylinder sleeve with an inner layer 1 of a corrosion-resistant metal tape, permanently connected around the perimeter, and a layer 10 of non-woven fibrous material impregnated with a polymer adhesive, after exposure to the sleeve at elevated temperatures and pressure when transforming the sleeve into a cylinder.

An example of the manufacture of a layered layered sleeve.

The inner layer 1 of the sleeve is made of two strips of steel 12X18H10T laid on top of each other, 230 mm wide, 0.2 mm thick, inseparably connected, for example, welded along the longitudinal edges with a seam 2 mm wide, at the end with a seam 2 mm wide. At a distance of 50 mm from the end of the inner layer, a hole with a diameter of 10 mm was cut out in one of the tapes and a fitting with a gasket was installed. On the outer side of the inner layer 1 is applied polymer adhesive 3 with a thickness of 3 mm Layer 2 of synthetic fiber material with a width of 235 mm and a thickness of 1.5 mm based on mylar fibers (TU 412.854-91) is laid on top of the adhesive layer 3. The length of the sleeve is 50 m. A layered flat-folded sleeve, rolled up into coils, is supplied to the repair site.

Repair of the pipeline is as follows.

The defective part of the pipeline 9 is cleaned from the inside using a rotary device. Sleeve sleeves are mounted on a reel above the well and a winch fixed above the other well, through the forming device (giving the sleeve a U-shape) mounted on the pipe end, the sleeve is dragged inside the pipeline located between the wells. Then the sleeve is inflated with compressed air. Bonding is carried out by an expanding mandrel with a gas burner. The thickness of the non-woven material of the porous structure ensures that the adhesive is forced through it only after the sleeve is pressed against the pipeline being repaired.

The ends of the sleeve with an inner layer 1 of stainless steel are welded through adapter rings to the pipeline being repaired 9.

The combination of the inner and outer layers of the sleeve, made of certain materials, indicated in the claims, provides extremely low sorption indicators and, accordingly, high sanitary and hygienic characteristics, as well as dimensional stability in a wide range of heat treatment temperatures and, therefore, a high speed of gluing of the sleeve. The presence of an inner metal layer provides the possibility of welding the sleeve at the junction of the repaired section of the pipeline, as well as operation at high temperatures and the ability to overlap large defects. The proposed layer-by-layer combination of sleeve materials provides a close value of the elastic modulus of the sleeve and the pipe being repaired, which allows the sleeve to take on a significant part of the load created due to internal pressure, and thereby slow down the process of destruction of the pipe being repaired.

The proposed design of the sleeve allows you to significantly expand the scope of its application due to additional electrical contacts made on the sleeve in order to pass electric current. Such heating prevents freezing of the pipeline, ensures its thawing, removal of paraffin from the inner surface of the pipeline. By changing the value of electrical resistance, you can control the integrity of the pipe.

Moreover, almost any known reactive or thermoplastic adhesive can be used in the manufacture of this sleeve.

The distribution of glue and its location between the inner and outer layers of the sleeve prevent it from flowing during the drawing process and provide a high uniformity of the distribution of glue, which in turn can significantly increase the adhesion of the sleeve to the inner surface of the repaired pipeline.

The present invention was tested in laboratory and field conditions when repairing a water supply system with an internal diameter of 150 mm and a length of 50 m.

A hygienic report of the Ministry of Health of the Russian Federation No. 77.0106.224.T.296 48.10.0 was obtained on a sleeve made of corrosion-resistant steel tape.

Each repaired section of the pipeline was subjected to hydraulic tests according to the methodology adopted by the State Enterprise “MOSVODOKANAL”. The results of all tests are positive.

Thus, using the proposed sleeve, the pipeline is repaired without excavating trenches by gluing the sleeve inside the defective area up to 200 meters long.

As a result of such repairs, the pipeline acquires operational parameters characteristic of pipelines made of stainless steel. The cost of such repairs is lower than the cost of repairs with the replacement of the pipe with a new one from ferrous metal.

When performing the work, modern robotic equipment for reconnaissance and remote repair is used.

None of the known hoses or liners for repairing pipelines provides repairs with the specified technical result.

From the foregoing, it follows that the claimed technical solution is aimed at solving the task and at the same time meets the requirements of protection under current law.

Claims (11)

1. Layered flat folded and capable of transforming into a cylinder sleeve containing an inner layer of flexible material, an outer layer of non-woven fibrous material and a polymer reactive or thermoplastic adhesives, characterized in that the inner layer is a reinforcing, and the polymer adhesive is placed between the inner and outer layers while the inner layer is made of two corrosion-resistant metal strips, permanently connected to each other around the perimeter and additionally equipped with a fitting. 2. The sleeve according to claim 1, characterized in that as reactive glue use one-pack or two-pack glue. 3. The sleeve according to claim 2, characterized in that when using a two-pack reactive adhesive, layers are made separately from each package, and an intermediate layer is additionally placed between them. 4. The sleeve according to claim 3, characterized in that the intermediate layer is made of fusible polymer. 5. The sleeve according to claim 3 or 4, characterized in that copolyesters or ethylene copolymers or copolyamides are used as the low-melting polymer. 6. The sleeve according to claim 2 or 3, characterized in that foaming glue is used as a reactive adhesive. 7. The sleeve according to claim 1, characterized in that hot melt adhesive is used as the thermoplastic adhesive. 8. The sleeve according to claim 7, characterized in that the thermoplastic hot melt adhesive is placed in the longitudinal direction in the form of rods, and in the transverse direction in the form of jumpers. 9. The sleeve according to claim 7, characterized in that a mixture of bitumen and a secondary thermoplastic is used as hot melt adhesive. 10. The sleeve according to claim 9, characterized in that the secondary polyethylene, or the secondary ethylene copolymer, or the styrene secondary copolymer is used as the secondary thermoplastic. 11. The sleeve according to claim 1 or 7, characterized in that the thermoplastic adhesive further comprises a crosslinking agent.

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