RU2641805C2 - Element of fixed support for pre-insulated pipeline - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: element comprises a pipe with a casing concentrically put thereon. The casing has a rigid connection with outer stops and two pairs of rings enveloping the pipe at the casing ends with a temperature gap between them. The element has a number of ribs located on the outer sides of the rings. The outer diameter of the casing and the rings corresponds to the outer diameter of the pipeline insulation. Wherein each ring adjacent to the casing butt ends is rigidly connected to the casing, and the second pair of the rings has a rigid connection to the pipe. Between the rings, there is a temperature gap.

EFFECT: reducing and eliminating stress in the structure, resulting from the temperature difference between the pipe and the casing, simplifying the design of the fixed support element, increasing its reliability.

2 cl, 2 dwg

Description

Technical field

The invention relates to structural elements of pre-insulated steel pipelines with thermal insulation for use in construction and the power industry when laying, in particular, heating networks, water pipes and other pipelines.

Fixed supports are used to secure pipelines. These supports absorb the forces and moments acting on the pipeline, prevent longitudinal or transverse shifts during operation of the pipelines, and are one of the most important structural parts of the pipeline. For pre-insulated pipelines, pre-insulated elements of fixed supports are used. The elements of fixed supports using external thrust devices are fixed in reinforced concrete panels, frame metal structures or other fixed supporting structures.

State of the art

A fixed support is known, which includes a pipe with polyurethane foam thermal insulation, passed through an opening in the shield and connected to it, metal shells attached to the shield on both sides, centering bearings mounted on the pipe, as well as a mastic tape applied to the shells and a heat-shrinkable element shrinkage of which is carried out over shells located on both sides of the shield, heat-shrinkable element.

The space between the polyethylene sheath pipes and the pipe is filled with polyurethane foam thermal insulation [RF Patent No. 114503, IPC F16L 59/135, F16L 59/14. Fixed support with polyurethane foam insulation / Narkevich S.L (BY), Pavlyuk E.S. (BY) OOO "SMIT-YARTSEVO" (RU). - 2011135776/06, Decl. 08/29/2011, publ. 03/27/2012] [1].

The design of such a fixed support has a large metal consumption, as It requires the use of a metal shield of large thickness, has large local heat losses. On large-diameter pipelines with high coolant temperatures, destruction of the fixed support may occur due to the thermal expansion of the metal shield.

A known design of a pre-insulated element of a fixed support, in which the pipe and casing of the fixed support are rigidly interconnected using longitudinal ribs [Typical solutions for laying pipelines of heating networks in foam-polymer-mineral (PPM) insulation: Structures and parts; ATP 313.TS-014.000. - M.: OJSC “Association VNIPIenergoprom, 2005] [2].

The disadvantage of this design is the occurrence of significant stresses due to thermal expansion of the pipe and the casing, due to the difference in their temperatures. These adverse factors can lead to the separation of the ribs and the destruction of the fixed support. In addition, the presence of ribs creates difficulties when sealing the inner annular gap between the casing and the pipe when installing thermal insulation of this design.

A known element of a fixed support, in which loads and moments from the pipeline with the help of ribs and flat rings are transferred to the design of the fixed support. A pipe runs concentrically to the pipe in the shield of the fixed support, the annular gap between it and the pipe is filled with thermal insulation, the ribs and flat thrust rings are placed in a casing having a conical and cylindrical part, the conical part of the casing is welded to a pair of flat rings, the outer diameter of the cylindrical part of the casing is equal to the outer the diameter of the insulation of the pre-insulated pipeline, and the space formed by the pipe and the casing is filled with thermal insulation [Typical solutions for laying pipelines of heating networks in insulation tion of polyurethane foam: Designs and details 313.TS-002.000. - M .: AOOT "Association VNIPIenergoprom, 1995] [3].

The disadvantage of this design is the complexity of manufacturing, the complexity, the small thickness of the insulation between the pipe and the pipe passing through the support.

Disclosure of invention

The technical result is to reduce to the exclusion of stress in the structure arising from the temperature difference between the pipe and the casing, simplifying the design of the fixed support element, reducing local heat losses, increasing the reliability and durability of the support during operation.

To achieve this result, in a fixed support element of a pre-insulated pipeline containing a pipe with a cylindrical casing concentrically mounted on it, having a rigid connection with the fixed support using stops, and two pairs of rings covering the pipe at the ends of the casing with a temperature gap between them. Moreover, each ring from a pair directly adjacent to the ends of the casing is rigidly connected to the casing. The second pair of rings is rigidly connected to the pipe and reinforced with ribs from the outside. The height of the ribs does not exceed the width of the rings connected to the pipe. The outer diameter of the casing and rings corresponds to the outer diameter of the pipeline insulation.

The width of the rings connected to the casing is at least twice the wall thickness of the casing.

Brief Description of the Drawings

For a clear understanding and explanation of the description attached drawings.

FIG. 1 shows a cross-sectional view of a structure of an element of a fixed support;

FIG. 2 - end assembly A of a fixed support element, cross section.

The fixed support element includes a pipe 1, a casing 2, covering part of the pipe and installed in a shield, frame, or in a fixed towbar using external stops 4. Two pairs of rings 3 and 3 'are installed at the ends of the casing. One pair of rings 3 is rigidly adjacent to the casing 2 of the element, for example, by means of a welded joint. The second pair of rings 3 'is rigidly connected to the pipe 1 and reinforced with ribs 5. There is a temperature gap between the rings 3 and 3'. The annular gap between the casing 2 and the pipe 1 is filled with insulation 6 through the hole 7. The outer diameter of the casing 2 and the outer diameters of the rings 3 and 3 'are almost equal to the outer diameter of the pipeline insulation.

The convenience of isolating the joint between the fixed support element and the pre-insulated pipeline, the quality of the ribs 5 contributes to the quality of the insulation and, ultimately, the reliability of the support. The height of the ribs should not exceed the width of the 3 'rings connected to the pipe.

To eliminate possible deformation of the casing, creating a reliable stop between the rings 3 and 3 ', the width of the rings 3 should be at least twice the wall thickness of the casing.

The assembly of the device is as follows.

At the ends of the casing 2 are rigidly fixed along the ring 3 from a pair of rings 3, for example, by welding. The resulting prefabricated part is installed on the pipe 1 and from each end of the prefabricated part, consisting of a casing 2 with rings 3 at its ends, rings 3 'are installed. The rings 3 'are rigidly connected to the pipe 1, preferably by welding, so that a temperature gap remains between the rings 3 and 3'. To enhance the fixation of the second pair of rings 3 'with the pipe 1, ribs 5 are mounted on it. On the casing 2, external stops 4 are installed and fixed. Such mounting is preferable to be carried out by welding. The annular gap between the pipe 1 and the casing 2 is filled with an insulating composition 6, for example polyurethane foam through the hole 7.

In this technical solution, the stops for fixing the casing on the pipe and in the fixed support are divided into two groups: external and internal. Internal thrust elements fix the casing on the pipe, while fixing the casing on the pipe is carried out in a persistent way, i.e. the internal stop on each side of the fixed support element works in only one direction. External stops fix the casing in the fixed support and their specific design depends on the design of the fixed support. For example, to install the fixed support element in a reinforced concrete shield, external stops in the form of flat rings can be used similarly to those used in shield fixed supports of the 5.903-15 series, issue 7-95 [Typical documentation for structures, products and units of buildings and structures. Series 5.903-13. Products and details of pipelines for heating networks. - Issue 7-95: Fixed pipeline supports: working drawings. - M .: AOOT "SEVZAPENERGO-MONTAZHPROEKT", 1995] [4].

To install the fixed support element in the frame metal structures of the supports, external stops are usually used in the form of separate parts, similar to those used in two-, four-stop fixed supports of the 5.903-15 series, issue 7-95 [4].

The separation of the emphasis system into two functional groups: external and internal allows simplifying the isolation of the fixed support and eliminating the use of complex conical elements used in known solutions and in existing practice. The casing also plays the role of a supporting element in isolating the joint between the fixed support element and the previously insulated pipe.

Alignment of the insulation thickness between the pipe and the casing mounted in a fixed support and the insulation thickness of the previously insulated pipeline can reduce local heat losses.

The proposed design solves the tasks and has the following advantages:

- the design ceases to be sensitive to the temperature difference between the casing and the pipe, becomes more reliable and durable;

- the design is easy to implement;

- the annular space between the pipe and the casing is easily and reliably insulated due to the fact that the casing-tube-ring system has a closed volume.

INFORMATION SOURCES

1. Patent No. 114503 of the Russian Federation, IPC F16L 59/135, F16L 59/14. Fixed support with polyurethane foam insulation / Narkevich S.L. (BY), Pavlyuk E.S. (BY) OOO "SMIT-YARTSEVO" (RU). - 2011135776/06, Decl. 08/29/2011., Publ. 03/27/2012.

2. Typical solutions for laying pipelines of heating networks in foam-polymer-mineral (PPM) insulation: Structures and parts; ATP 313.TS-014.000. - M .: JSC "Association VNIPIenergoprom, 2005

3. Typical solutions for laying pipelines of heating networks in polyurethane foam insulation: Structures and parts 313.TS-002.000. - M .: AOOT "Association VNIPIenergoprom, 1995

4. Typical documentation for structures, products and units of buildings and structures. Series 5.903-13. Products and details of pipelines for heating networks. - Issue 7-95: Fixed pipeline supports: working drawings. - M .: AOOT "SEVZAPENERGOMONTAZHPROEKT", 1995

Claims (2)

1. The fixed support element of a pre-insulated pipeline containing a pipe, with a cylindrical casing concentrically mounted on it, having a rigid connection with the fixed support using external stops, and two pairs of rings covering the pipe at the ends of the casing with a temperature gap between them, while each ring of a pair adjacent to the ends of the casing is rigidly connected to the casing, the second pair of rings has a rigid connection with the pipe and is reinforced with ribs from the outside, while the height of the ribs does not exceed the width of the rings dyna with the pipe, and the outer diameter of the casing and rings corresponds to the outer diameter of the insulation of the pipeline. 2. The fixed support element of a previously insulated pipeline according to claim 1, wherein the width of the rings connected to the casing is at least twice the wall thickness of the casing.

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