RU2527926C2 - Erection of sealed chamber for pipeline repair - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention can be used in repair of oil pipelines laid in marshlands, overwetted or loose sands. In compliance with this process, repair chamber semi-cylinder bottom is fitted on pipeline from above and provided with arched cut-outs at ends and swing-out mechanism including two grippers arranged at bottom ends, each comprising two hinged gripping elements with rollers. Note here that said bottom is mounted with its arched cut-out directed downward. Then bottom swing-out mechanism is locked by pipeline grippers by making said rollers contact with its surface to turn the bottom through 180 degrees. Then, chamber box-like case with arched cut-outs is fitted in pipeline to align the latter with bottom cut-outs for case and bottom to be tightly coupled together. Now, clearances between pipeline and chamber are sealed at both arched cut-outs.

EFFECT: ease of erection.

3 cl, 4 dwg

Description

The invention relates to the field of pipeline transport, and in particular to a technology for installing sealed chambers on a pipeline, and can be used in the repair of oil pipelines laid in swamps, as well as in weak, waterlogged or in loose sandy soils.

When repairing a pipeline, in particular, laid in swamps, problems often arise related to the refilling of the developed repair pit with fluid (water). To ensure that repairs are carried out in such conditions, it is necessary to temporarily seal the area around the pipeline in the area being repaired. For this purpose, repair chambers installed on the pipeline are used.

The prior art method of mounting a sealed chamber containing a hollow body with arched cuts, a rotary bottom in the form of a truncated cylindrical tank with arched cuts, and a device for rotating the bottom with a drive. According to the method, a chamber with an open arched cutout is lowered onto the pipeline with a lifting mechanism and is supported in this position. Then, the repair chamber is fixed with unloading devices, and with the help of a rotary mechanism, the bottom is rotated 180 °, and then the rotary bottom is fixed on the housing. After that, the gaps between the chamber and the pipeline are sealed (see the description of the RF patent No. 2196930, F16L 55/18, published on January 20, 2003).

The disadvantage of this method is the difficulty of installing the camera in the pipeline, associated with a large number of operations, as well as the fact that the bottom of the camera is mounted together with the body, which has a large mass and centering the camera on the pipeline takes a lot of time.

The objective of the claimed invention is to create a simple technology for installing a repair chamber.

The technical result of the claimed invention is to improve the convenience of mounting the camera on the pipeline.

The specified technical result is achieved due to the fact that the method of mounting a sealed chamber for repair work on the pipeline includes

the installation on top of the pipeline of a semi-cylindrical bottom of a repair chamber having arched cutouts at the ends for the pipeline, as well as a rotation mechanism that includes two gripper bottoms installed at the ends, each of which contains two articulated gripping elements on which the rollers are mounted, and the bottom is installed arched a cut-down, fixing the mechanism of rotation of the bottom on the pipeline by clamping the gripping elements of the pipeline with bringing the rollers into contact with its surface, the rotation of the bottom by 180 ° using using the rollers of the rotation mechanism, installing on top of the pipeline a box-shaped housing of the chamber having arched cutouts for the pipeline, when combining them with arched notches of the bottom, connecting the case and the bottom by means of a sealed detachable connection, and sealing the gaps between the pipeline and the camera in the place of the arched notches of the case and the bottom .

In addition, the specified technical result is achieved in private forms of the invention due to the fact that:

- the installation of the bottom and body on the pipeline is carried out with a gap of not more than 2 mm,

- after sealing the gaps, water is pumped out that enters the interior of the chamber during its installation.

In contrast to the known analogue, the inventive method uses a detachable camera, as well as a bottom rotation mechanism, the design of which provides convenient centering and fixing of the camera bottom on the pipeline. As a result, the process of mounting the camera during work is simplified.

The claimed method is implemented using a camera, the design of which is shown in figure 1.

The camera for repair work on the pipeline 1 contains a box-shaped case 2 and a hollow semi-cylindrical bottom 3, in which combined arched cutouts 4 and 5 are made, forming two circular holes at the ends for installing the camera on the pipeline 1. The case 2 and the bottom 3 of the camera are detachably connected for example, by means of bolts, while between the connection surfaces of the housing and the bottom there are sealing elements 6 fixed to the surface of the housing 2 by bolts 7 (see FIG. 1 c). In addition, the camera may also contain a removable roof 8 (see figa and 1b) mounted on the housing 2, and which can serve, in particular, to protect the camera from atmospheric precipitation. The bottom 3 has a rotation mechanism in the form of two grips 9 installed at the ends of the bottom 3 (Fig. 1a). Each grip 9 contains two pivotally connected gripping elements 10 on which the rollers 11 are mounted, as well as an adjustment screw 12 for pivoting (mixing / breeding) of the gripping elements 10. The gripping elements 10 are made in the form of curved strips pivotally connected at the ends, on each bar, two rollers 12 are installed, one roller - on the free end of the bar, and the second - in the place of its bend (see Fig. 16). For mounting the housing and the bottom, mounting loops 13 may be attached to them.

Figure 2-4 shows a diagram of an implementation of the claimed method using the described camera.

The method is as follows.

In the place of work develop repair pit 14 (figure 2). Using a lifting device through the mounting loops 13, the bottom 3 of the camera is lowered onto the pipeline 1 with an arched cut down (figure 2). Then, on the adjusting bolt 12, a collar 15 is installed and, by rotating the collar, the gripping elements 10 of the bottom rotation mechanism are brought together, ensuring that they encircle the pipeline 1 with the contact of the rollers 11 with its surface (Fig. 2). Due to this operation, the bottom 3 is centered, as well as its fixation on the pipeline 1.

Then the bottom 3 is rotated 180 ° using the rollers 11 (figure 3). The rotation of the bottom can be carried out manually or using a lifting mechanism.

Then, using the lifting mechanism, the casing 2 is installed on top of the pipeline with the arch cut down while aligning it with the arched cut out of the bottom 3. The bottom and the body are bolted using sealing elements 6 to form a sealed detachable connection. In this case, the installation of the bottom and the housing on the pipeline is carried out with a gap of not more than 2 mm.

After that, the gaps between the pipeline 1 and the camera in the place of the arched cutouts of the housing 2 and the bottom 3 are sealed. Then, if necessary, trapped water is pumped out of the interior of the chamber. In addition, a removable roof can be additionally installed on top of the housing.

As a result of the installation of the chamber, a sealed space is formed, inside which work is carried out to repair the defective section of the pipeline. Dismantling the camera is carried out in the reverse order.

Thus, due to the use in the claimed method of a detachable camera (detachable connection of the housing and the bottom), as well as the rotary mechanism described above, the installation of the camera on the pipeline is simplified.

Claims (3)

1. The method of installation of a sealed chamber for repair work on the pipeline, including
the installation on top of the pipeline of a semi-cylindrical bottom of a repair chamber having arched cutouts at the ends for the pipeline, as well as a rotation mechanism that includes two gripper bottoms installed at the ends, each of which contains two articulated gripping elements on which the rollers are mounted, and the bottom is installed arched neckline down
fixing the mechanism of rotation of the bottom on the pipeline by clamping the gripping elements of the pipeline with bringing the rollers into contact with its surface,
180 ° rotation of the bottom using the rollers of the rotation mechanism,
installation on top of the pipeline of the box-shaped housing of the chamber having arched cutouts for the pipeline, when combining them with arched cutouts of the bottom,
the connection of the housing and the bottom by means of a tight detachable connection, and
sealing gaps between the pipeline and the chamber in the place of the arched cutouts of the body and bottom. 2. The method according to claim 1, in which the installation of the bottom and body on the pipeline is carried out with a gap of not more than 2 mm 3. The method according to claim 1, in which, after sealing the gaps, water is pumped out to the inside of the chamber during its installation.

Images