RU2563094C1 - Fixed support of pipeline - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to the field of construction of surface pipelines and may be used in organization of pipeline supports under complex geological conditions, for instance, under permafrost conditions. A fixed support of a pipeline includes a coil, installed via units of electric insulation to two pairs of stands, made as capable of correction of their height for adjustment of height position and angle of support inclination fixed at a single-level capping, rigidly resting against a piled foundation. The coil is a pipe with an outer jacket and a layer of heat insulation with an inner shell fixed on it in a central part, to which longitudinal and transverse stiffening ribs are fixed, to provide for the possibility of coil fixation to stands. Stands are fixed to the capping via support flanges.

EFFECT: technical result consists in provision of stability of a structure and redistribution of load from a pipeline at a piled foundation.

10 cl, 6 dwg

Description

The invention relates to the field of construction of elevated pipelines and can be used to organize the support of the pipeline in difficult geological conditions, for example, in permafrost.

Fixed supports are installed to ensure absorption of linear elongations at temperature differences of the transported medium and ambient air, as well as when the pressure of the transported medium changes. They provide fixation of the pipeline during the estimated service life of the support, taking into account the increased loads that arise in the case of subsidence of adjacent movable supports.

The inventive support is used to separate the pipeline into thermal compensation units, inside of which the compensation of temperature deformations of the pipeline occurs, and is installed at the beginning and at the end of the thermal compensation unit.

A sufficient number of different types of fixed supports are known from the prior art.

In US patent No. 4139142, owned by Exxon Production Research Company, describes the design of a fixed support, which is formed by mutually intersected vertical and horizontal support rods, while the frame part forming the base of the support is significantly strengthened, which contributes to a more stable position in space.

Such a design of the support, according to the authors, ensures its stability even when operating in seismically active zones. The pipeline covered by a wide prefabricated clamp rests on one vertically oriented rod element rigidly fixed in the base frame. However, in case of possible subsidence or heaving of soil under the support with this design, the pile on which the rod element is fixed may be deformed, which will lead to the failure of the entire support.

The closest in technical essence to the claimed invention is the solution presented in RF patent No. 65167 "FIXED PIPELINE SUPPORT", which is characterized by the presence of hinges on which a lodgement with a clamp covering the pipe is fixed to two pairs of racks.

The main disadvantage of this device is that the coil is fixed in the lining of the inner shell by means of bolt joints, during operation of the pipeline, the bolt rods are pulled from the load, the nut fastening is weakened (as shown by the results of studies on cyclic tests of this unit with internal pressure and bending moment). This leads to a weakening of the fastening and the need for periodic tightening of bolted joints. The support structure does not include quick-detachable panels of the heat-insulating layer of the support for monitoring the condition of bolted joints and, if necessary, periodically tightening them.

The objective of the proposed technical solution is to create a fixed support structure that ensures the prevention of linear movement of the pipeline at the beginning and at the end of the compensation unit in all directions.

The technical result achieved when using the claimed invention is to ensure the stability of the structure and the redistribution of the load from the pipeline to the pile foundation, as well as to reduce the risk of negative deformation of the piles due to their jointless connection with the grillage.

The problem is solved in that the fixed support of the pipeline, according to the technical solution, includes a coil installed through the nodes of electrical insulation on two pairs of racks made with the possibility of adjusting them in height, mounted on a single-level grillage, rigidly resting on a pile foundation. The coil is a pipe equipped with an external casing and a layer of thermal insulation with an inner shell fixed to it in the central part, to which longitudinal and transverse stiffeners are rigidly attached, which enable the coil to be attached to the racks, and the racks are fixed to the grillage through the supporting flanges.

In special cases, the coil is equipped with flanges made in the form of thickened rings covering the inner shell at its ends. The inner shell is made of one rolled sheet welded into a pipe and welded to the coil pipe with annular seams. The coil is equipped with additional segmented stiffeners located under the inner shell and connecting the longitudinal ribs. As a coil insulation, non-combustible foam glass is used. The electrical insulation assembly is a bracket provided with dielectric material. The grillage rests on the pile without hinge, in order to organize such a connection, under the grillage on each pile, base plates are fixed with a hole for the pile, fixed to the pile and reinforced with vertical scarves, and pairs of clamps are rigidly fixed on the grillage, by means of a welded joint also connected to the pile and grillage. Base plates are rigidly connected to the grillage. The support coil can be installed along the axis of the pipeline with an inclination relative to the plane of the grillage, provided by the project. The racks are rigidly connected to the support flanges with the ability to accurately set the height and angle of inclination during installation.

The invention is illustrated by the following drawings.

In FIG. 1 is a schematic side view of a fixed support of the claimed design.

In FIG. 2 schematically shows a front view of the fixed support of the claimed design.

In FIG. 3. presents a top view of the grillage.

In FIG. Figure 4 shows an image of an adjustable stand assembly with a flange.

In FIG. 5 is an image of an electrical insulation assembly.

In FIG. 6 is a view of a fixed support coil.

The positions in the drawings indicate:

1 - coil;

2 - outer casing;

3 - thermal insulation;

4 - an adjustable rack;

5 - supporting flange;

6 - node electrical insulation;

7 - dielectric gaskets;

8 - grillage;

9 - longitudinal beams grillage;

10 - transverse beams grillage;

11 - base plate;

12 - a clamp;

13 - pile foundation (not included in the support);

14 - longitudinal ribs;

15 - inner shell;

16 - transverse stiffeners (on the inner shell);

17 - flange (on the inner shell).

The inventive fixed support is a rigidly welded structure that prevents any movement of the pipeline. The support to the place of operation is supplied assembled and mounted on a grillage (included in the support kit), which evenly distributes the loads from the pipeline to the foundation piles. The support has an external anticorrosive and heat-insulating coating, made in the factory.

The main element of the support is a coil 1, which is made of a pipe for welding to the pipeline. In the central part around the coil pipe, an inner shell 15 is mounted made of a rolled sheet pressed around the pipe and welded with a longitudinal seam (without welding to the coil). The inner shell is welded to the pipe with annular seams. Fastening means for loading a support, for example, eyelets, are welded to the inner shell in its upper part. In the lower part, longitudinal ribs 14 are rigidly attached to the side of the shell on both sides, each of which is a sheet of metal of rectangular shape with holes for accommodating the fastening means of the coil (swivel), the longitudinal size of which corresponds to the longitudinal size of the inner shell. Also, stiffening ribs - flanges 17, made in the form of thickened metal rings, are welded near the ends of the shell. Under the inner shell, additional stiffeners are rigidly attached (welded) to the longitudinal ribs in the form of transverse segments 16 (segment stiffeners) along the radius of the inner shell. After preparing the coil in this way, it is thermally insulated with non-combustible material, such as foam glass. A protective shell made of galvanized steel is installed on the heat insulation 3, which is an external casing 2, which prevents the penetration of moisture (water) into the internal cavity of the support. The longitudinal ribs 14 are brought out from under the casing. The coil, through the bolted joint of the longitudinal ribs with the electrical insulation unit, is mounted on four racks 4, which are made in pairs (pairs of racks opposite each other on both sides of the pipeline) of the same height. The height of the pair of racks is determined by the design position of the pipeline support and the slope of the terrain. Racks in accordance with the design operating conditions are cut off when mounting the supports on the pipeline or in the factory to the desired height level, each rack is equipped with a support flange 5, by means of which the rack height is adjusted with an accuracy of ± 1 mm, ensuring the coincidence of the axis of the pipeline on adjacent supports. Adjustable racks are structural support elements and provide transfer of load from the coil assembly to the grillage. The flange after the final reconciliation of the height level of the rack is welded to it by the outer and inner circumferential seams. In the upper part of the rack, the adjustable ones are equipped with a base of sheet metal and scarves that perform the function of stiffeners. The racks assembled with a flange are installed on the grillage 8, which is a frame structure made up of longitudinal 9 and transverse 10 beams interconnected in the same plane, while the longitudinal beams of the grillage cover the pile from two sides, which eliminates the bending load on the pile. Electrical racks 6 are installed on the racks, which are brackets for organizing bolted connections with the longitudinal ribs of the coil, in which (brackets) are placed gaskets of dielectric material 7 and bushings with washers in bolted joints. The grillage is mounted on the pile foundation 13 through the base plates 11, each of which is a thickened plate with an opening for the pile. The base plate is installed on the pile at the elevation of the horizon, combining the marks of the geometric centers of the pile and the base plate, after which it is welded to the pile at the design height, providing a deviation from the flatness of the supporting surface of the base plate no more than 2 mm, and the grill is rigidly attached to each supporting stove. All connections reinforce vertically oriented scarves. On the upper surface of the grillage in the place of attachment to the pile, two clamps 12 are installed, each of which is a thickened plate and covers the pile along the radius. The clamps are welded to the pile and to the grillage. In this way, the structural stability of the fixed support is achieved and the rigidity of the entire structure is ensured. Mounting the grillage on piles in two planes at different levels ensures their jointless joint, preventing the radius of the underground part of the pile from deforming radially. The grillage is provided with a corrosion-resistant coating, for which, for example, two-layer coatings with zinc-containing primers can be used.

The inventive support works as follows.

The outer diameter and strength class of the steel of the support coil correspond to the characteristics of the pipe section for which it is intended. The wall thickness of the coil is not less than the wall thickness of the pipe for which it is intended. On the pipeline route, the support on the racks is installed on the grillage, while the racks are cut to a predetermined height and fixed to the grillage through the support flanges. The ends of the coil are welded to the pipeline, and the place of welding is isolated.

When welding a support coil with a pipeline, it becomes part of the pipeline. As a result, the support accepts all the loads from the pipeline. The power design of the coil, the principle and the implementation of its support on the racks ensure the prevention of axial and lateral movements of the pipeline and the transfer of load perceived by the coil to the support grill through brackets with electrical insulation with adjustable racks and pile foundation. A dielectric material is installed in the brackets, which allows you to electrically isolate the pipeline from the grillage of the pile foundation.

Claims (10)

1. Fixed support of the pipeline, characterized in that it includes a coil installed through the nodes of electrical insulation on two pairs of racks, made with the possibility of adjusting them in height, mounted on a single-level grillage, rigidly supported by a pile foundation, while the coil is provided with an external casing and with a layer of thermal insulation, a pipe with an inner shell fixed to it in the central part, to which longitudinal and transverse stiffeners are rigidly attached, allowing fastening Nia coil to the column and the column fastened to the raft foundation through the support flanges. 2. The fixed support of the pipeline according to claim 1, characterized in that the coil is equipped with flanges made in the form of thickened rings covering the inner shell at its ends. 3. The fixed support of the pipeline according to claim 1, characterized in that the inner shell is made of one rolled sheet welded into a pipe and welded to the coil pipe with annular seams. 4. The fixed support of the pipeline according to claim 1, characterized in that the coil is equipped with additional segmented stiffeners located under the inner shell and connecting the longitudinal ribs. 5. The fixed support of the pipeline according to claim 1, characterized in that non-combustible foam glass is used as the coil insulation. 6. The fixed support of the pipeline according to claim 1, characterized in that the electrical insulation unit is a bracket provided with a dielectric material. 7. The fixed support of the pipeline according to claim 1, characterized in that the grillage is made with the possibility of hinge-free bearing on the pile, while under the grillage on each pile base plates are fixed with a hole for the pile, fixed to the pile and reinforced with vertical scarves, and rigidly on the grillage fixed pairs of clamps, through a welded joint also connected to a pile and grillage. 8. The fixed support of the pipeline according to claim 7, characterized in that the base plates are rigidly connected to the grillage. 9. The fixed pipeline support according to claim 1, characterized in that the support coil is installed along the axis of the pipeline with an inclination relative to the plane of the grillage. 10. The fixed pipeline support according to claim 1, characterized in that the racks are rigidly connected to the support flanges with the ability to accurately set the height and angle of inclination during installation.

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