Polymeric reinforced pipe and method of its making

FIELD: pipeline engineering.

SUBSTANCE: polymeric reinforced pipe comprises grid frame made of longitudinal metallic rods and transverse rods made of high-module fibers or cords wound along the longitudinal rods. The grid frame in the polymeric unit has additional lateral layer made of metallic rods wound directly on the longitudinal metallic rods. The transverse reinforcing rods made of high-module fibers are wound to provide several mutually perpendicular layers and are housed in the polymeric unit from the outer side of the layer of the metallic transverse rods. The method comprises feeding the longitudinal metallic reinforcing rods to the mandrel, making the layer of transverse reinforce made of high-module fibers, and filling the frame with a polymer. The transverse reinforcing layer made of metallic rod is directly wound on the metallic longitudinal rods, the frame is filled with a polymer, and then several mutually perpendicular layers of the transverse rods are wound on the surface obtained. The polymer is poured again. The longitudinal metallic rods are fed to the mandrel until the cross-section of the pipe is defined.

EFFECT: enhanced strength.

2 cl, 2 dwg

 

The invention relates to the production of plastic pipes, reinforced reinforcing frame intended for the construction of pipelines transporting liquid, gaseous environment and pulp with chemically aggressive characteristics at high pressures and temperature fluctuations.

Known plastic pipe containing the inner and outer layers of thermoplastic material and located between the reinforcing filler of the polymer or mineral material, made in the form of continuous filaments, recessed in the outer surface of the inner layer and the inner surface of the outer layer of thermoplastic material, and the thread is wound in two layers in mutually opposite directions and form a diamond-shaped cell skeleton (Patent RU No. 2205318, MKI7F 16 L 9/12).

The disadvantage of this pipe is the inability of the perception of high axial loads due to the low hardness of the diamond-shaped cells of the framework.

The method of manufacture of this pipe (Patent RU №2205318, MCI F 16 L 9/12) is wound on a plasticized by heating the outer surface of the inner thermoplastic layer of tension on the spiral lines in two mutually opposite directions, of continuous filaments of polymeric or mineral material, which delve into the outside the second surface of the inner thermoplastic layer, then apply the outer thermoplastic layer and the protruding portion of the reinforcing threads delve into the inner surface of the outer layer.

The disadvantage of this method of manufacturing reinforced plastic pipe is the inability to obtain pipe with high susceptibility axial loads.

Famous trumpet, mainly of polymeric materials containing power strength in the form of a metal mesh frame of longitudinal and wound them transverse reinforcement bars, fastened at the points of their intersection (Patent RU №2056571, MCI F 16 L 9/12).

The disadvantage of this pipe is not high enough load capacity for large diameter pipes, limited cross-section of the transverse reinforcement bars, which cannot be increased because of the small bend radius defined by the diameter of the pipe, and the step of winding the transverse rebars cannot be reduced to improve the durability because of the need to ensure reliable penetration of the molten polymer through cells of the carcass. In addition, such a tube has a large mass characteristics and high rigidity, which prevents the laying of the pipeline on rough terrain or with deviations from linearity without the use of deflecting devices (fittings).

The method of manufacture of this pipe(Patent RU №2056571, MCI F 16 L 9/12) involves placement of longitudinal reinforcement bars on the mandrel, winding their lateral reinforcement, the bond of their intersection points, for example, welding and filling formed of a skeleton in a monolithic block polymer.

The disadvantage of this method of manufacturing a polymer pipe is the inability to obtain large diameter pipes with high load capacity.

Known polymer reinforced pipe (Patent RU №2220354, MCI F 16 L 9/12), adopted as a prototype, containing housed in a monolithic block polymer power strength in the form of a mesh frame consisting of longitudinal metal and wound them in a single layer of transverse reinforcement bars of non-metallic material, for example of high modulus fibers or bundles, are fixed relative to each other at the points of their intersection.

Execution of the transverse reinforcement bars of high modulus fibers or bundles that at small cross-section have considerable strength, can provide a high load capacity of large diameter pipes, but an irregularity in the perception of axial and radial loads, as the cross-layer non-metallic reinforcement accepts radial load and can not bear the axial and because the non-metallic layer p is pepper armature is in contact with the metal cores of the longitudinal reinforcement, the axial loads are transmitted. In addition, cross-resistance cross-section of the pipe produced low because of high modulus fibers considerable strength have low rigidity.

The method of manufacture of this pipe (Patent RU №2220354, MCI F 16 L 9/12), adopted as a prototype involves feeding the mandrel longitudinal reinforcement bars, wrapped with tension in the longitudinal reinforcement bars of the longitudinal rods of high modulus fibers, the fixation of the reinforcement bars relative to each other at their points of intersection of the through holes with the outer surface of the longitudinal rods and the subsequent casting of the polymer, and fed to the mandrel longitudinal rods is carried out by pulling the end of the already formed pipe.

The disadvantage of this method is the inability to obtain large diameter pipes with high load capacity ravnopolochny both in axial and in the radial direction. In addition, the disadvantages should be considered as an action of pulling shaped pipes, which leads to deformation of the shape of the cross section of the pipe, because when a large diameter pipe and, accordingly, increased the diameter of the longitudinal rods, pulling efforts significantly increased, and the cross section of the pipe has a low resistance in the above design flaws.

Task is, solved by the invention is to increase the strength in the radial direction reinforced polymer tubes with transverse reinforcement of high modulus fibers, as well as to improve the stability of the cross-section of such large diameter pipes.

The solution of the invention in the part of the method of manufacturing a polymer pipe is to provide opportunities ravnopolochnyj polymer tubes with transverse reinforcement of high modulus fibers and sustainable cross-section, especially large diameter pipes.

This problem is solved as follows.

In the known polymer tube containing the amplifier strength in the form of a mesh cage of longitudinal metal and wound along their length transverse reinforcement bars of high modulus fibers or bundles, placed in the block polymer ACCORDING to the INVENTION a wire mesh cage has an additional transverse layer of metal reinforcement bars, wound directly on the longitudinal metal rods and transverse reinforcement bars of high modulus fibers wound in several mutually overlapping layers and placed in the block polymer from the outer side of the metal cross bars.

In a known method of manufacturing plastic pipes, comprising applying to the mandrel longitudinal is metallicheskih rebars, forming a layer of transverse reinforcement of high modulus fibers and the subsequent casting of the polymer ACCORDING to the INVENTION directly on the metal longitudinal reinforcement bars revive the transversal reinforcement layer of metal rods, are pouring the molten polymer is then formed on the polymer surface revive several mutually overlapping layers of transverse reinforcement bars of high modulus fibers and again are filled with the polymer melt, while the supply to the mandrel longitudinal metal reinforcement bars are produced by forcing vtalkivaniya before the formation of the cross-section of the pipe.

1 shows a longitudinal section of the proposed pipe.

Figure 2 shows a cross-section of the proposed pipe.

Polymer reinforced pipe contains a booster cushion in the mesh frame of the longitudinal metal rods 1 and wound on them transverse metal bars 2, are fastened at their intersections, for example, by welding 3. With a gap relative to the transverse metal rods 2 with their outer side posted by transverse reinforcement bars 4 of the high modulus fibers or bundles wound along the metal rods 1 at least two mutually intersecting layer.

Formed two-component power strength is placed in the block polymer 5, 6.

For transportation of liquid and gaseous media under high pressure in such pipe is the following distribution of axial and radial loads. The axial forces are taken up by the rods 1 longitudinal metal reinforcement, transverse metal rods 2 partially accept radial loads and, due to its rigidity stabilize the shape of the cross section of the pipe. The transverse rods 4 of the high modulus fibers or bundles placed with a gap relative to the metal cross-bars 2, is practically unloaded from axial forces, which they perceived bad, and fully accept radial loads. Thus, the pipe is equal to the load capacity both in axial and in radial directions at a steady-shaped cross-section that is most important when large diameter pipes.

A method of manufacturing a polymer pipe includes a metal filing of longitudinal reinforcement bars 1 on a mandrel(not shown) by forcing vtalkivaniya, and are fed by forced vtalkivaniya individual rebars before the formation of the reticulated framework that enables the use of longitudinal rods high rigidity in the manufacture of large diameter pipes. Then on the longitudinal metal rods navivajut longitudinal metal rods 2 and fasten them at the intersection with the longitudinal rods 1, for example, by welding 3. After this exercise fill educated mesh frame by the polymer melt 5, formed on the polymer surface revive several mutually overlapping layers of transverse reinforcement bars 4 of the high modulus fibers or bundles (minimum two coats) and are filled with the polymer melt 6. The inner surface of the pipe is formed on the water-cooled mandrel, and the outer - forming sleeve. Cutting the pipe to length produce after its cooling on the output table.

1. Polymer reinforced pipe containing the amplifier strength in the form of a mesh cage of longitudinal metal and wound along their length transverse reinforcement bars of high modulus fibers or bundles, placed in the block polymer, wherein the net frame has an additional transverse layer of metal reinforcement bars, wound directly on the longitudinal metal rods and transverse reinforcement bars of high modulus fibers wound in several mutually overlapping layers and placed in the block polymer from the outer side metal layer of the transverse rods.

2. A method of manufacturing plastic pipes, comprising applying to the mandrel longitudinal metal reinforcement bars, forming a layer of transverse reinforcement of high the muzzle of the fibers and the subsequent casting of the polymer, characterized in that directly on the metal longitudinal reinforcement bars revive the transversal reinforcement layer of metal rods, are pouring the molten polymer is then formed on the polymer surface revive several mutually overlapping layers of transverse reinforcement bars of high modulus fibers and again are filled with the polymer melt, while the supply to the mandrel longitudinal metal reinforcement bars are produced by forcing vtalkivaniya before the formation of the cross-section of the pipe.



 

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