Biplastic pipe

FIELD: mechanical engineering; pipe transport.

SUBSTANCE: invention can be used in laying plastic pipelines. Proposed biplastic pipe contains carrying layer made of glass plastic, lining layer and locking rings arranged along pipe axis. Lining layer is formed by winding thermoplastic material on pole to form T-shaped locking rings with winding of glass fabric impregnated with phenol-formaldehyde resin with subsequent solidifying of resin and melting of thermoplastic material. Caoutchouc-based raw calendered rubber is used as thermoplastic material, or polyethylene, polypropylene or polyvinylchloride film. Pipe is provided with bell for connecting the pipes with subsequent melting of lining layer in place of contact in bell part. To reinforce connection of pipes, sleeve-band is used which is arranged on outer surface of bell part. Pipe-to-pipe joint is reinforced by welding stainless material inserts.

EFFECT: improved reliability of pipeline.

6 cl, 5 dwg

 

The invention relates to the field of housing and communal services (HCS) and to other sectors of the economy primarily for the transportation of drinking products (water, juice, etc), including highly aggressive environments.

In the housing are used for transporting drinking water steel and in the last decades of polyethylene pipes. Steel pipe during operation are subjected to corrosion, which reduces the quality of drinking water and for emergency situations when the pipe fails.

Polyethylene pipes (GOST 18599-2001; RF patent 2161749, IPC 7 F 16 L 9/12, 10.01.2001) is much more durable steel. However, due to the small strength polyethylene pipes require a significant increase in wall thickness, especially for pipes with a diameter of 400 mm and above. Increasing the wall thickness leads to stricter requirements for welding them together, i.e. to the quality of the weld.

The connection of plastic pipes provide a welding method using expensive equipment, in particular for pipes with a diameter of 400 mm or more. The quality of the weld also requires special equipment and highly qualified professionals.

Another disadvantage of polyethylene pipes is their susceptibility to UV radiation. This requires drastic measures during storage and transportation of pipes.

Order above the Oia strength polyethylene pipes last reinforced on the outer surface of various fibrous materials and polymer resins, thus receiving bielstrasse pipe (see RF patent 2208735, 2154766, 2208732, IPC 7 F 16 L 9/12). For these purposes, use as a ready-made pipes made of thermoplastics, and sheets, welded along the axis of the formed tube.

All these bielstrasse tubes have a common disadvantage in that due to the large difference in coefficient of thermal linear expansion of a diverse class of materials (thermoplastics and reinforcing materials) it is difficult to provide an adhesive connection of the pipe and the reinforcing material. Through the use of special glues and resins, this adhesive connection is provided by a relatively small ranges (up to a diameter of 200-250 mm). For large diameters in the process of operation from the effects of differential temperature and transported medium, and the radial stress is the bundle of pipes on the adhesion layer. This ultimately leads to the exit pipe of the system.

From the patent RU 2166145, IPC 7 F 16 L 9/12, 27.04.2001 taken for the prototype, known bipustulata pipe with protective (protective) layer, is made in the form of concentric layers of chemically and abrasion resistant rubber, stacked in each layer in a spiral with overlapping and connected with the power frame of fiberglass using intermediate system layer, which consists of concentric layers are impregnated swazey them low-density material with invasion of the adjacent layer of the protective coating with the formation of a strong mechanical interlock with power hull (fiberglass). To retain lining layer (rubber) with the power case with a certain step has a retaining ring. Rings are in the shape of a rectangular triangle, made of fiberglass epoxy binder and are directly in contact with the transported medium.

This pipe has the same drawbacks as mentioned above billmassy pipes. Another disadvantage is that the retaining ring in direct contact with the transported medium. This fact reduces the chemical resistance of the pipe in General due to less chemical resistance of the retaining ring compared to rubber (liner) layer of the pipe. A retaining ring with a lining layer (rubber) and the lining layer is connected to the power frame (GRP) pipes only due to the mechanical coupling (porosity), i.e. have the interface of two materials.

Thus, the effects of temperature and radial loads during operation of the pipe lead to micro-cracking and subsequent failure of the pipe. Another important factor in the manufacture of this pipe (prototype) is a high technological complexity, which leads to the high price of the pipe, comparable to the price of stainless steel pipe.

Task to be solved by the claimed invention is technical is the result, consisting in a simple, reliable and economical method of manufacturing bielstrasse pipes of almost any diameter.

The solution to the above problem is achieved by the fact that in bielstrasse pipe having a lining layer, a supporting layer of fiberglass and the locking ring along the axis of the pipe, not in contact with the conveyed medium lining layer is formed by winding on a mandrel a thermoplastic material to a thickness of 1.5÷10 mm with the formation of T-shaped locking rings followed the winding of the glass fabric, impregnated with phenol-formaldehyde resin, and curing the resin, and the melt termoplastycznego material at a temperature of 140÷180°C. When the locking rings are located along the pipe axis so that that the ratio of the step with which they are situated, to the pipe diameter is 0.15÷3.

As thermoplastic material used raw Karandawala rubber with a thickness of 1÷3 mm on the basis of various rubber or polyethylene, or polypropylene, or polyvinylchloride film.

The pipe has a bell on the ends for connecting pipes between a subsequent reflow lining layer in contact for 30÷150 mm in the female part by means of a heating tape.

To enhance the connection of pipes used clutch-band on the outer the second surface of the female part.

The pipe connection is reinforced by the welding of stainless liners.

The t-shaped section of the locking rings along the length of the lining layer of the pipe allows for the manufacture of pipes virtually unlimited diameter without fear of delamination lining layer from the raw fiberglass layer. This is achieved by two factors. The first is that the locking ring is T-shaped section provides additional efforts to compensate thermal expansion of the lining layer. The second factor is the additional mechanical coupling lining layer with a monocoque fiberglass layer through the upper support T-shaped section of the stop ring.

The use of polyethylene film for formation of a liner layer of the pipe allows you to adjust its thickness in the desired direction, i.e. to have a thickness of 1.5÷10 mm

The pipe connection is a socket method with subsequent melt plastic lining layer in the contact length of 30÷150 mm allows for fast and high-quality connection of pipes. When fusing does not occur chemical degradation of polyethylene in place of the connection, as is the case for the welding of polyethylene pipes. This method of connection (melting) does not require special equipment and specialists for the control of designated compounds the s pipe. Sufficient control of the sealing joint is a simple visual inspection, showing the homogeneity of the material seat sealing lining layer in the bell of the pipe.

Strengthening the joints of pipe between them after melting lining layer in the socket of the pipe spend several ways:

- by banding (winding) of the joints, glass tape impregnated in the polymeric resin of cold hardening;

- using a plastic (or other material) of the clutch, which consists of two parts. One part is installed on the projection of the cone of one pipe, the other part for cutting the second ledge (with which it is connected) pipe;

connection is made by welding of stainless liners between a spigot end of the pipe. The inserts fit into the socket and conical part of the tube during its manufacture.

The invention is illustrated in the drawings, in which figure 1 presents a fragment of a longitudinal section bielstrasse pipe.

Figure 2 - socket connection billmassy pipes.

Figure 3 - socket connection billmassy pipes with rubber seal.

Figure 4 - socket connection billmassy pipes by application.

Figure 5 - socket connection billmassy pipes with stainless liners.

An example of concretevisitor bielstrasse pipe.

On the prepared mandrel with a diameter of 1000 mm and a length of 3 m is wound polyethylene film (GOST 10354-73) thickness of 0.15 mm in the amount of 10 layers (see figure 1, item 1). Then, step 700 mm polyethylene film wrapped around the ring width of 20÷30 mm and a height of 3÷5 mm Inter-space zamatyvaetsya fiberglass scientific brand-210 (TC 648-00202956-30-94), impregnated with phenol-formaldehyde resin grade SPI-304 (GOST 20907). Fiberglass is wound to a thickness of 4 mm, Then the plastic ring wrapped plastic film width 60÷90 mm, thus forming a base (support) T-shaped section of the stop ring (item 2). The height of the winding of the base 3÷4 mm, Then the entire surface of the mandrel are wound fiberglass scientific-210, resin-impregnated SFG-304. When the winding thickness of the laminate (2) is 6 mm Final operation of winding is wound over the entire surface of the tube of heat-shrinkable polypropylene fabric brand MP (TU 8237-019-05766623-2001).

After completion of the winding process pipe with mandrel are placed in the camera curing, where the melting of the polyethylene film and curing the resin at a temperature of 140÷180°C for 90 minutes. At the end of the curing process pipe with mandrel is unloaded from the camera and then curing the finished pipe is removed from the mandrel.

Por the measures of the ways of connecting pipes between them:

Example 1:

The pipe connection is a plug-in method (see figure 2). Socket and conical part of the tube are made in the process of winding pipes. Connection pipe (item 1 and 2) is due to the melting lining socket layer (3) and cone (4) parts of the tubes. Melting is carried out by means of a heating tape (5) brand LUNG (TU 3443-004-42235774-00), which is wound on the outer surface of the bell pipe. When reaching the heating temperature 200°it was incubated for 15 minutes the temperature Control is carried out using a portable device brand it 1511.

Example No. 2:

The pipe connection is carried out analogously to example No. 1, except that the melt lining layer is omitted. The connection pipe is due to the rubber o-rings (see figure 3, 5), which are placed in a special groove socket and conical parts of the pipe. These grooves are formed in the process of winding pipes.

Example No. 3:

The pipe connection is carried out analogously to example 1 or example 2, except that the gain of the node connecting pipes conduct its banding (see figure 4). Band (5) is wrapped around the bell ten layers of fiberglass impregnated with a polymer resin of cold hardening. As polim the nuclear biological chemical (NBC resin is used - polyester, epoxy or phenol-formaldehyde.

Example # 5:

The pipe connection is carried out analogously to example 1 or example 2, except that to strengthen the host pipe joints are welded stainless steel liners (see figure 5). Inserts (Ref. 5) fit into the socket and conical part of the tube during its manufacture.

1. Bipustulata pipe having a lining layer, supporting layer of fiberglass and the locking ring along the pipe axis, in which a covering layer is formed by winding on a mandrel a thermoplastic material to a thickness of 1.5÷10 mm with the formation of T-shaped locking rings followed the winding of the glass fabric, impregnated with phenol-formaldehyde resin, and curing the resin, and the melt of thermoplastic material at a temperature of 140÷180°and locking rings are located so that the ratio of pitch to diameter of the pipe is 0.15÷3.

2. The pipe according to claim 1, in which thermoplastic material used raw Karandawala rubber with a thickness of 1÷3 mm on the basis of different rubbers.

3. The pipe according to claim 1, in which thermoplastic material is polyethylene or polypropylene, or polyvinylchloride film.

4. The pipe according to any one of claims 1 to 3, which has a socket at both ends for connecting pipes together on the next reflow lining layer in contact for 30÷ 150 mm in the female part by means of a heating tape.

5. The pipe according to any one of claims 1 to 3, in which to strengthen the connection of pipes used clutch-band on the outer surface of the socket part.

6. The pipe according to any one of claims 1 to 3, in which the pipe connection is reinforced by the welding of stainless liners.



 

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