Reinforced polymeric pipe and method of its making

FIELD: pipeline engineering.

SUBSTANCE: reinforced polymeric pipe comprises inner and outer polymeric layer and reinforcing layer interposed between them and made of high-module fibers or cords, at least two layers of longitudinal rods and transverse rods wound on the longitudinal rods. The longitudinal rod is provided with thickenings throughout its length. The longitudinal rods of the first layer are submerged under the outer surface of the inner polymeric layer at a depth close to the half thickening. The method comprises making inner polymeric layer, laying the first layer of the longitudinal rods on its outer side, wounding transverse rods with interference, and forming the outer polymeric layer. Before laying, the longitudinal rods are provided with thickenings, and the outer side of the inner polymeric layer is heated up to plasticizing down to a depth of close to the half thickness. When winding the first transverse layer, the tension is chosen sufficient for the embedding the thickenings of the first layer of the longitudinal reinforce into the plasticized layer throughout its depth.

EFFECT: improved adhesion of reinforce with polymer.

2 cl, 1 dwg

 

The invention relates to the production of plastic pipes, reinforced by the reinforcing frame, which can be used in the construction of pipelines for transportation of gases and liquids, including corrosive, high pressure and temperature.

Known plastic pipe (patent RU 2205318, IPC 7 F 16 L 9/12 from 19.02.2001)containing the inner and outer layers of thermoplastic material, and located between them a reinforcing filler of the polymer or mineral material in the form of continuous filaments, recessed into the outer surface and the inner surface of the outer layer.

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 frame formed by the layers are wound in mutually opposite directions of threads.

A known method of manufacturing a plastic pipe (patent RU 2197387, IPC 7 B 29 D 23/00 from 19.02.2001), including heating of the outer surface of the inner thermoplastic layer, application of a reinforcing filler of the polymer or mineral material in the form of two layers wound with tension in mutually opposite directions of the filaments and the subsequent application of the outer thermoplastic layer.

The disadvantage of this method is is the impossibility of obtaining plastic pipes with high sensitivity to axial loads.

Known pipe reinforced polymer steering strength of high modulus fibers or bundles, placed in the monolithic block polymer containing at least two layers of longitudinal and transverse reinforcement, placed sequentially on the wall thickness of the pipe with offset of each subsequent eponymous layer relative to the corresponding previous value that is a multiple of step elements in the layer divided by the same number of layers, with the coils of transverse reinforcement bars adjacent layers have a deviation from the circle, and longitudinal rods, starting from the second layer, placed between them zigzag (patent RU 2220353, IPC 7 F 16 L 9/12 from 30.09.2002). This pipe is adopted as a prototype.

The disadvantage of this pipe is unequal load-carrying capacity of the first and subsequent layers of longitudinal reinforcement bars due to the different conditions of their interaction with the polymer layers, as the longitudinal rods of the first layer linear, and longitudinal rods subsequent layers - zigzag, resulting in the coupling of the longitudinal rods of the first layer of the polymer is smaller than the next. In addition, coupling zigzag longitudinal rods with polymer also is not reliable enough due to the small bending angle.

A known method of manufacturing a polymer pipe (p the tent EN 2200353, IPC 7 F 16 L 9/12 from 30.09.2002), adopted as a prototype, which consists in the fact that the pre-formed inner polymer sheath pipe, the outer surface of the received inner polymer layer stack terminals of the first layer of the longitudinal reinforcement, after which produce a wrapped transverse rebars, and subsequent layers of longitudinal rods and transverse reinforcement placed alternately in the thickness of the pipe wall, shifting each subsequent eponymous layer compared to the corresponding previous value that is a multiple of step elements in the layer divided by the same number of layers, the winding of the transverse reinforcement bars are under tension, whereby fix the first layer of longitudinal reinforcement rods relative to the outer surface of the inner polymeric layer and bent longitudinal bars, starting from the second layer between the turns of adjacent layers of transverse reinforcement bars, fixing them relative to each other.

The disadvantage of this method is the inability to obtain a polymer pipe with the same value of the load capacity of the wall thickness and reliable fixation of the longitudinal rebars relative to the polymer.

The problem solved by the invention in terms of products, is to ensure equal loading is sposobnosti thickness of the pipe wall and the fixation of the longitudinal rebars relative to the polymer and increase the load capacity of the pipe as a whole.

The problem solved by the invention in terms of method, is to provide opportunities for polymer pipe with high load capacity.

This problem is solved as follows.

In the known polymer tube containing the inner and outer polymer layers and placed between the amplifier strength of high modulus fibers or bundles having at least two layers of longitudinal rods and wound their lateral reinforcement, placed sequentially on the wall thickness of the pipe, According to the invention along the entire longitudinal length of the valve stem is made of thickening, while the longitudinal rods of the first reinforcement layer are recessed in the outer surface of the inner polymeric layer by an amount close to half of the thickening.

Thickening of the longitudinal reinforcement bars can be made in the form of nodes and loops.

In a known method of manufacturing a polymer pipe, including the formation of the inner polymer layer, the layer on the outer surface of the rods of the first layer of the longitudinal reinforcement, wrapped with tension transverse rebars, subsequent alternate laying lengthwise and wrapped with tension transverse rebar in the wall thickness of the pipe and forming an outer polymeric layer, Coz the ACLs to the invention before installation of the longitudinal reinforcement bars they perform thickening, for example, tie knots, and the outer surface of the inner polymer layer is heated to plasticization at a depth close to half of the thickening, and the tension during the winding of the first transverse reinforcement layer is selected is adequate for the implementation of the swelling of the first layer of the longitudinal reinforcement in the plasticized layer on the depth.

1 shows a General view of the proposed polymer pipe (longitudinal section a-a in figure 2).

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

Figure 3, 4, 5 shows a possible form of execution of the bulges on the longitudinal reinforcement bars.

Pipe reinforced polymer contains power strength in the form of a mesh frame made of high-modulus fibers or bundles, placed in the block polymer of the inner layer 1 and outer layer 2. Net framework consists of the first layer of longitudinal rods 3 and wound on them transverse rods 4.

Longitudinal rods 3 are distributed around the circumference with step t, the step of winding the transverse rods 4 is t1. On the layer of the transverse rods 4 are stacked, the second layer of longitudinal rods 5 with step t, but offset relative to the longitudinal rods 3 of the first layer by the value t/2. On the layer of longitudinal rods 5 is wrapped around the second layer of the transverse rods 6 with step t1 but offset relative to the transverse rods 4 by the value of t1/2. The coils of the second layer of the transverse rods 6 are the deviation from the circle, and the rods 5 of the second layer of the longitudinal reinforcement placed between them zigzag. Similarly can be performed subsequent layers of reinforcement.

On the longitudinal rods 3, 5 are made of thickening 7 as nodes with hinges placed along the pipe axis with a step of t2. Longitudinal rods 4 of the first layer are recessed in the outer surface of the inner layer polymer 1 by an amount close to half of the thickening 7.

The presence of thickening 7 on the longitudinal reinforcement bars 3, recessed in the outer surface of the inner layer polymer 1 and the inner surface of the outer layer of polymer 2 at approximately equal size, provides a reliable and isometric grip these rods with both polymer layers 1, 2, and accordingly the load is evenly distributed between them. Thickening 7 on the longitudinal rods 5 of the second reinforcement layer also provide more traction rods of the polymer, which in General leads to the creation of strong spatial rigid net frame is fastened securely to the polymer uniformly perceiving the load across the wall thickness of the pipe.

A method of manufacturing a polymer pipe is as follows.

The article is rinah valve, which will be used as longitudinal, perform the thickening 7, for example tied nodes with loops in increments of t2then form the inner layer of polymer 1, is laid on him the longitudinal rods 3, distributing them evenly around the circumference of the increments of t, then heat the outer surface of the inner layer polymer 1 to plasticization of his depth, close to half of the thickening 7, and produce a wrapped transverse reinforcement bars 4 in increments of t1and with a tension sufficient to implement thickening 7 on the depth of plasticized layer. Thereafter, the coils of the first layer of transverse reinforcement 4 stack the rods 5 of the second layer of the longitudinal reinforcement in increments of t, but with an offset from the rods 3 of the first layer by the value of t/2 and revive them with tension rods 6 of the second layer of transverse reinforcement in increments of t1but offset relative to the transverse rods 4 by the value of t1/2, the rods 5 are becoming a zigzag shape. Similarly can be formed subsequent layers of reinforcement. After forming the mesh of the spatial framework form the outer layer of polymer 2.

The method provides for obtaining polymer pipe high load capacity due to reliable coupling of the longitudinal reinforcement bars with the polymer and equally the th of the load capacity of the wall thickness of the pipe.

The method can be implemented on a known device with the addition of special equipment.

1. Pipe reinforced polymer containing inner and outer polymer layers and placed between the amplifier strength of high modulus fibers or bundles having at least two layers of longitudinal rods and wound their lateral reinforcement, placed sequentially on the wall thickness of the pipe, characterized in that the entire length of the longitudinal valve stem made of thickening, while the longitudinal rods of the first reinforcement layer are recessed in the outer surface of the inner polymeric layer by an amount close to half of the thickening.

2. Pipe reinforced polymer according to claim 1, characterized in that the thickening of the longitudinal reinforcement bars made in the form of nodes and loops.

3. A method of manufacturing a polymer pipe, including the formation of the inner polymer layer, the layer on the outer surface of the rods of the first layer of the longitudinal reinforcement, wrapped with tension transverse rebars, subsequent alternate laying lengthwise and wrapped with tension transverse rebar in the wall thickness of the pipe and forming an outer polymeric layer, wherein before laying longitudinal rebars they do have is almenia, for example, tie knots, and the outer surface of the inner polymer layer is heated to plasticization at a depth close to half of the thickening, and the tension during the winding of the first transverse reinforcement layer is selected is adequate for the implementation of the swelling of the first layer of the longitudinal reinforcement in the plasticized layer on the depth.



 

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