RU2386886C1 - Method for sealing of threaded joint for pipes and its design - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: threaded joint for pipes comprises contact surfaces including sections equipped with thread and sealant arranged between contact surfaces of joined pipes. Sealant is installed in lengthy elastic sleeve with length of at least one thread turn equipped with nozzle at one of its ends. Shell of lengthy elastic sleeve may be arranged as impermeable or partially permeable for sealant.

EFFECT: invention makes it possible to execute sealing of joints in non-disconnected pipeline, where pumped medium prevents location and beginning of direct functioning of sealant.

13 cl, 4 dwg

Description

The invention relates to threaded connections. Can be used to connect pipes for various purposes with a diameter of 250 mm or more.

Threaded connections are known which comprise various coatings on a threaded surface.

When repairing pipelines of drainage systems of large diameter from various materials (concrete, steel, etc.), lightweight polyethylene pipes of the Veholight type are used for pressure-free pipelines. Polyethylene pipes are laid inside the existing pipeline being repaired. This operation is called “pipe in pipe” or “relining”. At the same time, pipes are connected to each other by welding, couplings or, most often, threads. A threaded connection is preferred in connection with the fact that it does not increase the diameter of the new pipeline at the junction and allows maximum use of the flow area of the existing pipeline being repaired.

The tightness of the threaded connection is achieved by welding with an extruder, the use of heat-shrinkable tape or special sealants introduced into the space between the threaded surfaces.

The closest technical solution to the proposed ones is a method and device for sealing a threaded connection, which contains contact surfaces including threaded sections, and a layer of urethane ADV-17 oligomer in contact with them is placed between the contact surfaces of the pipes being connected. The urethane ADV-17 urethane oligomer layer can be made foamed (see the description of the utility model for RF patent No. 566546, IPC7 F16L 15/00, published on 09/10/2006).

The disadvantages of the known method and device is the need for a non-working or non-operating pipeline at the junction to seal the connected pipes.

The objective and technical result of these inventions is the ability to use the method and device for sealing the connection in non-disconnected pipelines, where the pumped medium by its impact prevents the placement and start of operation of the sealant directly. A sealant is understood as “sealing compounds, compositions based on polymers that are applied to bolted, riveted or other compounds in order to ensure their impermeability” (“Soviet Encyclopedic Dictionary” edited by AMProkhorov. - M.: Soviet Encyclopedia, 1987. - 1600 s .; p. 266).

The specified technical result in the method is achieved by using a method of sealing a threaded connection for pipes, including screwing up contact surfaces containing threaded sections, placing a sealant between the contact surfaces of the connected pipes, the pipes being screwed, a technological hole is made in the covering pipe at the place of the threaded section, through it, an extended elastic sleeve with a length of at least one turn of thread, equipped with a fitting on one of of their ends, then the sealant is pumped into the sleeve through the fitting, all fragments of the sleeve are hidden in the inter-threaded space and the technological hole is closed.

In addition, hardening sealant can be used.

In addition, expandable sealant may be used.

In addition, hardening and expanding sealants can be used.

In addition, they can use an extended elastic sleeve with a fitting on one of its ends with an open opposite end.

In addition, they can use an extended elastic sleeve with a fitting on one of their ends in the form of a closed shell.

In addition, for introducing an extended elastic sleeve into the inter-threaded space, a flexible rod with a device for capturing the far end of the sleeve or a support of overpressure pumped through the nozzle can be used.

In addition, they can use a sheath of an extended elastic sleeve impervious to sealant.

In addition, they can use the shell of an extended elastic sleeve, at least part of which is partially permeable to sealant.

The specified technical result in the device is achieved by the fact that the threaded connection for pipes containing contact surfaces, including threaded sections, a sealant between the contact surfaces of the connected pipes, the sealant is placed indirectly in an extended elastic sleeve with a length of at least one thread thread equipped with a fitting on one from their ends.

In addition, an extended elastic sleeve with a fitting on one of its ends can be made with an open opposite end.

In addition, an extended elastic sleeve with a fitting at one of its ends can be made in the form of a closed cylindrical shell.

In addition, the shell of the elongated elastic sleeve can be made impervious to sealant.

In addition, at least part of the shell of the elongated elastic sleeve can be made partially permeable to sealant.

Using the proposed device will allow for the installation and sealing of joints in a passing medium moving inside the pipes.

The invention is illustrated by drawings.

1 shows pipes in an open, unconnected state.

Figure 2 shows the pipes in connection.

Figure 3 shows an elongated elastic sleeve filled with sealant, a little bit longer than one thread. The sleeve is shown occupying a working spatial position in threaded coils. The pipes themselves and the threaded space are not shown for clarity.

Figure 4 shows an extended elastic sleeve filled with sealant, five threads in length. The sleeve is shown occupying a working spatial position in the inter-threaded space. The pipes themselves and the threaded space are not shown for clarity.

The claimed invention is implemented as follows. Pipe 1 is connected to another pipe 2 through a threaded connection "coupling" - "nipple" inside the existing repair pipeline through its open upper part according to the recommendations of the pipe manufacturer. Pipes 1 and 2 are made by spiral winding a closed profile with welding adjacent adjacent walls. When removing the polyethylene layer inside the pipe, a screw threaded surface "sleeve" is obtained, when removing the polyethylene layer outside the pipe, a threaded "nipple" surface is obtained. The "coupling" and "nipple" can be mated with each other by screwing and form a threaded connection. For the implementation of the claimed sealing and connection in the upper part of the threaded connection using a mechanized tool on the outer diameter of the pipe, a "window" is cut (hole; not shown conventionally in the drawing) into the inter-threaded space, which in size can open access to one or several turns of thread. The cut-out element (not shown conditionally in the drawing) is saved for subsequent sealing of the resulting hole - the “window”.

Through the hole made, an extended elastic sleeve 3 is launched into the inter-threaded space, having a closed cylindrical surface, and a nozzle 5 in one of the end surfaces. A compressed air source is connected to the nozzle 5 at the first stage to advance the sleeve along the internal threaded space. In another embodiment of the claimed invention, an extended elastic sleeve can be advanced along the thread by means of a flexible rod, for example, inserted into the sleeve through a fitting. A flexible rod is also used in the case of an elastic sleeve with an open opposite end. For this, the rod can be provided, for example, with a controlled clamp for fixing the far edge of the sleeve shell. The length of the sleeve is chosen not less than the length of one thread turn (see items 3 and 4), with a cross section that allows you to overlap the cross-section of the inter-thread space. If a long sleeve with an open end is used, then the far edge of the sleeve is brought out through a hole made to jam (clog) the open end. A sealant in the liquid phase is pumped to the spatially filled and located sleeve through the nozzle 5. To deliver the sealant to a distant point, a thin hose is used, which is gradually withdrawn from the sleeve as it is filled with sealant (not conventionally shown in the drawing). In the case of using a long sleeve with an open end, the injection of the sealant can be carried out without a thin hose, and directly through the nozzle 5. In this case, the open end is muffled after filling the sleeve with a sealant.

At the end of filling the sleeve, a thin hose is removed (if used), the nozzle 5 of the sleeve is closed, the end of the sleeve is tucked into the “window” and secured to the pipe wall, for example, with a self-tapping screw. The “window” is closed with a previously cut part and secured, for example, with a hand extruder. The shell of the sleeve can be used and made partially permeable to the sealant, to ensure that the sealant enters the spaces adjacent to the main overlapping section. In small spaces and relying on the reinforcing effect of a seeping sleeve (stocking), a liquid sealant seals adjacent slots and spaces in a passing environment (drains) through pipes.

The input sleeve in the inventive threaded connection is performed in an area above the level of drains. Water (drains; fluid transported by the pipeline), which may be in a sealed joint in the inter-threaded space, is displaced by the introduced sealant in the shell when the claimed joint is made.

The sleeve is used from a material selected depending on technological tasks, taking into account the density and hygroscopicity of its walls.

The volume of supplied sealant is calculated depending on the geometric parameters of the thread, the ambient temperature and the parameters of the sealant itself.

Tests of the claimed compounds for the tightness of the joint of gravity sewer are performed according to standard SFS 3113.

The claimed invention can be carried out using means and components known in the art and meet the condition of "industrial applicability".

Claims (13)

1. A method of sealing a threaded joint for pipes, including screwing up the contact surfaces containing threaded portions, placing a sealant between the contact surfaces of the connected pipes, characterized in that the pipes are screwed, in the covering pipe in the place of the threaded section, a technological hole is made through it into the inter-threaded space start an extended elastic sleeve with a length of at least one thread, equipped with a fitting on one of its ends, then pressurize the sleeve through the fitting to, hide all fragments of the sleeve in the inter-threaded space and close the technological hole. 2. The method according to claim 1, characterized in that use hardening sealant. 3. The method according to claim 1, characterized in that use expandable sealant. 4. The method according to claim 1, characterized in that use hardening and expanding sealant. 5. The method according to claim 1, characterized in that they use an extended elastic sleeve with a fitting on one of its ends with an open opposite end, and for its introduction into the inter-threaded space use a flexible rod with a device for capturing the far end of the sleeve. 6. The method according to claim 1, characterized in that they use an extended elastic sleeve with a fitting on one of their ends in the form of a closed shell, and for its introduction into the inter-threaded space, a back-up of excess air pressure is pumped through the nozzle. 7. The method according to any one of claims 1 to 6, characterized in that the shell of an extended elastic sleeve is not permeable to sealant. 8. The method according to any one of claims 1 to 6, characterized in that they use the shell of an extended elastic sleeve, at least part of which is partially permeable to sealant. 9. A threaded connection for pipes containing contact surfaces, including threaded portions, a sealant between the contact surfaces of the pipes to be joined, characterized in that the sealant is placed in an extended elastic sleeve with a length of at least one thread turn, equipped with a fitting at one of its ends. 10. The threaded connection according to claim 9, characterized in that the elongated elastic sleeve with a fitting on one of its ends is made with an open opposite end. 11. The threaded connection according to claim 9, characterized in that the elongated elastic sleeve with a fitting on one of its ends is made in the form of a closed shell. 12. The threaded connection according to claim 11, characterized in that the shell of the elongated elastic sleeve is made not permeable to sealant. 13. The threaded connection according to claim 11, characterized in that at least part of the shell of the elongated elastic sleeve is made partially permeable to sealant.

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