RU65165U1 - BALLASTING ANTI-EROSION DEVICE OF MATTRESS AND TUF TYPE - Google Patents

Abstract

The device relates to the field of means for providing ballasting of pipelines, both during the repair of existing ones, and when laying new, mainly trunk, pipelines while preventing erosion processes.

The task is to create a ballasting anti-erosion device of a mattress-mattress type, which, with possible sub-flooding of the pipeline, would provide an increase in the mass of the load acting on it due to the involvement in the work of the mass of ballast material located in adjacent zones separated by partitions. Filling with bulk ballast material with an excess of not less than 5% leads to the fact that under dynamic action the ballast material is somewhat denser and the filling of each zone divided by partitions becomes complete (when this value changes to values less than 5%, the zones divided by jumpers are uneven in area) due to the displacement of the ballast material to one of the jumpers during installation, the possible deflection of the wire mesh and its destruction under external load, with a significant excess, n example higher than 15%, it is technically difficult to make the lid closing). Each hexagonal cell mesh formed by double torsion provides a sufficiently high anchoring performance - significant resistance to shear located on the basis of the parts of the ballasting device that occurs when the subfloat of the pipeline. The ballast material is wrapped by the outlets of the material of the interlayer placed in the box, fastened together to form a container by reflow and / or wire twists, and the jumpers when laying the device on the pipeline are oriented along its longitudinal axis.

Description

The device relates to the field of means for providing ballasting of pipelines, both during the repair of existing ones, and when laying new, mainly trunk, pipelines while preventing erosion processes.

A device for ballasting a pipeline is known, which comprises a soft mesh container with a bottom filled with ballast and suspended from the pipeline, made in the form of two spaced cavities, the bottom of each of which is formed of a flexible panel that prevents the ballast from spilling through the mesh cells (1).

The known device does not exclude the possibility of loss of ballast through the side walls, which significantly reduces the reliability of its operation.

A device for ballasting pipelines, made in the form of a pair of interconnected by a seam containers for ballast material, located seam along the axis of the pipeline (2).

Such a device is intended for carrying out underwater operations using a material pipeline located on a floating vessel that pumps ballast material into containers located and deployed along the underwater pipeline.

The closest known device is to solve the problems of protecting pipelines, announced as part of a meeting of specialists "Modern technologies of gabion structures,

represented by Gabions McCafferry CIS in the St. Petersburg Construction Center and made in the form of a double-torsion gabion from gabion and used in combination with geosynthetic materials (3).

Such a device, in the form presented at the meeting of specialists, has not been disclosed to the extent necessary for its implementation and has so far been in trial operation at a number of CIS facilities. The results of the operation showed the need for constructive refinement of the device to the extent presented further in the description materials.

The technical task is to create a ballasting anti-erosion device of a mattress-mattress type, which, with possible sub-flooding of the pipeline, would provide an increase in the weight of the load acting on it due to the involvement of the mass of ballast material located in adjacent zones separated by partitions. In addition, filling with bulk ballast material with an excess of not less than 5% leads to the fact that under dynamic action, the ballast material is somewhat denser and the filling of each zone separated by partitions becomes complete (when this value changes to values less than 5%, filling is uneven in area zones separated by jumpers due to the displacement of the ballast material to one of the jumpers during installation, possible deflection of the wire mesh and its destruction under external load, with a significant Increasing, for example, more than 15%, it is technically difficult to close the lid). In addition, each hexagonal mesh cell formed by double torsion provides a sufficiently high anchoring performance - significant resistance to shear located on the basis of the parts of the ballasting device that occurs when the subplot of the pipeline.

This is achieved by the fact that the ballasting anti-erosion device of the mattress-mattress type, which is laid on the pipeline through a protective mat, includes filled with bulk ballast material in the form of sand or a sand-gravel mixture and having a layer of filtering synthetic material placed in it, a box rectangular in plan, formed of steel mesh double torsion with hexagonal cells, divided by cross-sectional jumpers made of mesh with a uniform interval with reinforcing them along the perimeter, the height of which is equal to the height of the longitudinal and transverse sides of the box, and having a mesh cover fixed to the sides or to the sides and to the jumpers, while the bulk ballast material is located in the box on a layer of filtering synthetic material with an excess of at least than 5% of the level of the sides and the height of the lintels, and is wrapped with outlets of interlayer material bonded together to form a container by fusion and / or wire twists, with the front and rear longitudinal sides of the box formed from the bottom of the box by bending it and tied with a continuous, at least along the length of one side of the lintel, wire length to the ends of the lintels with a capture of the wire of their reinforcement, and the lintel and its parallel sides are provided with pairs of lifting loops connected to the reinforcing wire, and the jumper when laying devices on the pipeline are oriented along its longitudinal axis, and the protective mat has a length exceeding the diameter of the pipeline. In addition, the protective mat can be fixed at the bottom of the box before laying the device on the pipeline, and the container can be made sectional along the length of the box and its sections are located between the jumpers and sides of the box.

Figure 1 - General view of the ballasting anti-erosion device mattress-mattress type, located on the pipeline in the design position.

Figure 2 - the cover of the box from the grid,

Figure 3 - box with jumpers,

Figure 4 - ballasting anti-erosion device mattress-mattress type assembly (with partially removed the lid of the box).

The ballasting anti-erosion device of the mattress-mattress type (Fig. 1) is laid on pipeline 1. The device includes a rectangular box 2 filled with bulk ballast material in the form of sand or sand-gravel mixture, in which a layer 3 of synthetic filtering is placed between the grid and ballast material material. The box 2 is formed of a double torsion steel mesh with hexagonal cells 4 and is divided into sections 5 by crosspieces that are transversely spaced at a uniform interval and made of mesh. Jumpers 6 to ensure rigidity and stability have reinforcement 7 with wire around their perimeter. The height of the jumpers 6 is equal to the height of the longitudinal and transverse sides 8 of the box. On top of the box 2 is closed by a lid 9 of mesh, which is fixed to the sides 8 or to the sides 8 and to the jumpers 6. Bulk ballast material is located in the box 2 on a layer 3 of filtering synthetic material with an excess of not less than 5% of the level of the sides 8 and the height of the jumpers 6. The interlayer 3 can be made of several layers stacked on top of one another, and the ballast material is wrapped by outlets of the material of the interlayer 3, which are fastened together to form a container (Fig. 4) by fusion of their edges and / or wire twists. In the box 2, the front and rear longitudinal sides 8 are formed from the mesh of the bottom of the box by bending it and are tied with a continuous, at least along the length of one side of the jumper, piece of wire to the ends of the jumpers 6 with a capture of the wire of their reinforcement 7. The jumpers 6 and the sides parallel to them are provided pairs of lifting loops 10 associated with reinforcing wire 7.

The jumpers 6 when laying the device with a cross-beam lifting mechanism on the pipeline 1 are oriented along it

the longitudinal axis, which allows, due to the presence of reinforcement 7, to preserve their shape, and due to the use of double torsion wire, to prevent mesh breaks along the outer perimeter and crushing of the mesh along the inner perimeter of the curved section located on the pipeline. To prevent damage to the pipeline, as well as to protect the filter material from rupture by extraneous inclusions located outside the duct, the protective mat 11 has a length exceeding the diameter of the pipeline 1. To do this, the protective mat 11 can be fixed at the bottom of the duct 2 before laying the device on pipeline 1. As an option , the container (Fig. 4) can be made sectional along the length of the duct 2 and its sections, isolated to prevent overfilling of the ballast material, are located between the jumpers 6 and the sides 8 of the duct.

The proposed technical solution over the long term passed pilot tests at various facilities in various climatic zones with the provision of high ballast reliability based on their results.

Information sources:

1. USSR author's certificate No. 1818493, F16L 1/06, 1993.

2. US patent No. 3793845, E02D 15/06, 1974.

3. “Modern technologies of gabion structures represented by Gabions McCaferry CIS,” a meeting of specialists on August 30, 2001 at the St. Petersburg Construction Center, http://articles.strovbm.ru/sobitiya/20010828143700/index.html.

Claims (3)

1. Ballasting anti-erosion device of mattress-mattress type, laid on the pipeline through a protective mat, including filled with bulk ballast material in the form of sand or sand and gravel and having a layer of filtering synthetic material placed in it, a rectangular box in plan, formed from a double steel mesh torsion with hexagonal cells in shape, divided by jumpers from the grid transversely spaced at a uniform interval with reinforcement with wire around the perimeter, the height of which is equal to the height of the longitudinal and transverse sides of the box, and having a mesh cover fixed to the sides or to the sides and jumpers, characterized in that the bulk ballast material is located in the box on a layer of filtering synthetic material with an excess of at least 5% the level of the sides and the height of the lintels and are wrapped by outlets of the interlayer material, bonded together to form a container by reflow and / or wire twists, with the front and rear longitudinal sides of the box formed from a grid of bottoms and boxes by bending it and tied with a continuous length of wire at least on the length of one side of the lintel to the ends of the lintels with gripping wires for their reinforcement, and the lintels and sides parallel to them are provided with pairs of lifting loops connected to the reinforcing wire, and the lintels when laying the device on the pipeline oriented along its longitudinal axis, and the protective mat has a length exceeding the diameter of the pipeline. 2. The device according to claim 1, characterized in that the protective mat is fixed at the bottom of the box before laying the device on the pipeline. 3. The device according to claim 1 or 2, characterized in that the container is made sectional along the length of the box and its sections are located between the jumpers and sides of the box.