SE466218B - FIXING POINTS FOR INSULATED PIPELINES - Google Patents

Description

466 218 2 digt as a retainer for the management. These two-part clamping jaws also require an elastic tensioner and seem to be more suitable for cable lines or for lines that transport goods at ambient temperature than for transporting hot or cold media.

Furthermore, fixing points for pipelines for hot or cold media are known, in which a radial metal plate projecting radially from the pipeline is welded to the inner tube of steel. this solution also has significant disadvantages: - A thermal short circuit occurs between the metallic inner tube in contact with the transported medium and the material surrounding the fixed point of the pipeline, e.g. concrete or soil. As a result, significant heat losses are inevitable.

The metallic, usually steel-fastened mounting plate is in the outer area. Thereby, vagabonding resp. current * currents are led to the inner tube.

- In addition to the high outer temperature of the mounting plate, in addition to heat losses from the pipeline system. that the mounting plate corrodes faster. Finally, if the mounting plate is inserted in concrete, a premature cracking in the concrete can be provoked by the dissipated heat.

The inventors have therefore undertaken the task of creating fixing points for pipelines of the type mentioned in the introduction, which effectively prevent expansions resp. contractions in the longitudinal direction of the pipelines, have a long service life, do not harm the environment or damage themselves prematurely and are also affordable and repair-friendly.

The object is solved according to the invention by a fixing point on a pipeline for hot or cold media, etc. according to claim 1. For manufacturing technical reasons, the bushings with the pipe preferably run in the axial direction. The bushings serve to retract a known moisture protection conductor, which always reacts to leaks in the outer or inner pipe. Furthermore, the foaming of the cavities is facilitated.

Especially with district heating pipes, the inner pipe, the mounting discs, the retaining ring and the countertops preferably consist of stainless steel or copper.

While the inner pipe extends uninterrupted from socket to socket on the pipeline elements, the jacket pipe extends from fixed point to fixed point, from socket to socket or from socket to fixed point. It is collared over the counter discs and normally strikes the pressure rings. Therefore, the jacket pipe is broken at each fixed point in the area of the pressure rings and mounting plates. High-density polyethylene (HDPE) or polypropylene (PP) is particularly well suited as a material for the jacket pipe.

The retaining ring engaged with the jacket tube preferably extends on both sides beyond the countertops. Depending on its material, the retaining ring is welded to the mounting plate, soldered or glued. Since in practice in most cases both elements consist of steel, they are suitably welded together.

For chemical and physical reasons (corrosion and vagabonding or current currents), the transition area from the jacket pipe to the retaining ring is preferably covered with a shrink film, which is usually about 1-3 mm thick. This function would in principle also be taken over by a sprayed or applied protective layer. However, the handling would be more complicated than the application of a shrink film. This consists of known plastic materials, such as e.g. crosslinked polyethylene by irradiation.

The pressure rings which hold the mounting plates laterally with a low elasticity, however, preferably consist of a known glass fiber-reinforced plastic material, for example of epoxy resin or only of an epoxy resin. Any displacement of the mounting plates or the pressure rings in the radial direction is prevented by the pipes arranged in the bushings.

The cavity extending between the inner and jacket tubes is suitably filled with a polyurethane foam (PUR) produced in situ.

The device according to the invention with fixing points on pipelines for hot or cold media has in particular the following advantages: The inner space of the pipeline and the surrounding material, for example concrete or earth, are thermally separated. The outside of the mounting plates therefore has a significantly lower (or higher during transport of coolant) temperature than the transported medium, which allows significantly lower heat losses and in district heating leads to less corrosion.

- Thanks to the mechanical gap between the steel and the mounting plate and its elastic sfdbuppstötÜníng * ', the thermomechanical stresses on the pipeline and the anchorage are reduced.

- The material surrounding the pipeline and the metallic inner tube is electrically separated and thus no Vaga-bonding currents can enter the metallic inner tube. Despite the significant improvements, the outer diameter of the fixing points according to the invention is not larger than with the far less advantageous known solutions.

The invention is described in more detail in connection with an embodiment according to the closest prior art and a particularly favorable embodiment according to the invention. The partially sectioned partial views in the longitudinal direction of the pipelines show in - Fig. 1 the closest technology and - Fig. 2 a pipeline with an insulated mounting plate. 5 466 218 According to Fig. 1, the mounting plate 10 is fastened with welding seams 12 directly to the inner tube 14. The mounting plate and inner tube consist of steel. The mounting plate 10 engages through the jacket tube 16 and is welded to the retaining ring 18 lying close to the jacket tube via welding seams 20. The jacket tube 16 is broken in the area of the mounting plate 10, whereby it abuts directly against this board.

The steel end regions of the retaining ring 18 are each coated with a shrink film 22, which prevents the penetration of moisture between the jacket tube 16 and the retaining ring 18.

The mounting plate 10 is provided with a bushing 24, which connects the cavity separated by this plate between the inner pipe 14 and the jacket pipe 16 and allows the retraction of a moisture protection conductor. The cavities are filled with polyurethane foam 26.

Fig. 1 shows the previously listed disadvantages of the closest prior art very clearly, in particular the "tanmiskau = and" the electrical short circuit between the metallic Thner_ff pipe 14 and the material surrounding the pipeline, e.g. concrete foundation or the ground.

Fig. 2, which shows an embodiment according to the present invention, clearly shows how the mounting plate 10 is spatially separated from the metallic inner tube 14. Thereby, neither a thermal nor an electrical short circuit can occur between the mounting plate and the inner tube.

With welds 30, counter-plates 32 are insoluble on the inner tube 14. Between these counter-plates 32 and the fastening plate 10, the pressure rings 28 of glass fiber-reinforced plastic material are arranged.

The tube 34, which also consists of glass fiber-reinforced plastic material, engages through the counter-plates 32, the pressure rings 28 and the mounting plate 10 in the axial direction. This pipe 34 connects on the one hand the cavities on both sides of the fixing point between the inner and jacket pipes and on the other hand supports the mounting plate 7.1. 466 218 6 and the pressure rings 28 in the radial direction. over the entire circumference of the pipeline, 2-6 pipes 34 are arranged per fix.

The shrink film 22 is arranged in the area of the transition from the jacket tube 16 to the retaining ring 18. In this way, the fixing point is moreover preferably protected in its most difficult place against the ingress of moisture.

Finally, Fig. 2 also shows a neoprene wall sleeve 35, which comprises the jacket pipe broken in the area of the mounting plate 10 and the pressure rings 28.

Claims (10)

7,466,218 Patent claims Fixed point on a pipeline for hot or cold media in the form of one in concrete, sand. gravel, stone or earth anchored, mounting plate (10) projecting in the radial direction from the pipeline, the pipeline consisting of a metallic inner pipe (14), a jacket pipe (16) and an insulating material (26). which fills the cavity between the tubes and wherein the mounting plate (10) is coaxially arranged at a distance from the inner tube, lies close to the jacket tube (16) and is connected to a retaining ring (18). which extends on both sides in the axial direction and is laterally thermally and electrically insulated, which insulation is held by two counter-plates (32) welded to the inner tube (14), which close the annular cavity between the tubes. characterized in that the mounting plate (10) is insulated and the counter-plates (32) are passed through "at least two straight, penetrations1, in each of which there is a" connecting manifold "(341; supports the mounting plate (10) and the insulation in the axial direction is inserted, that the insulation consists of two elastic pressure rings (28) resistant to a temperature of 200 ° c and that the jacket tube (16) of plastic material is collared over the countertops ( 32) and is broken in the area of the pressure rings (28) and the mounting plate (10). Fixing point according to Claim 1, characterized in that the tube (34) extends in the axial direction. Fixing point according to Claim 1 or 2, characterized in that the connecting pipe (34) consists of glass-fiber-reinforced plastic material. Fixing point according to one of Claims 1 to 3, characterized in that the inner tube (14). the mounting plate (10), the retaining ring (18) and / or the counter-plates (32) consist of steel or copper. 4.4 UL; i 466 218 8 Fixing point according to Claim 4, characterized in that the mounting plate (10) and the retaining ring (18) are welded to one another. ' Fixing point according to one of Claims 1 to 5, characterized in that the jacket pipe (16) consists of HD polyethylene or polypropylene. Fixing point according to one of Claims 1 to 6, characterized in that the retaining ring (18) extends in the axial direction upwards over the counter-discs (32). Fixing point according to one of Claims 1 to 7, characterized in that the transition area from the jacket pipe (16) to the retaining ring (18) is covered with a shrink film (22) of plastic material, which preferably consists of 1-3 mm thick through irradiation crosslinked polyethylene. Fixing point according to one of the claims Iaäï, characterized in that the pressure rings (28) consist of a glass fiber reinforced plastic material, preferably an epoxy resin. Fixing point according to one of Claims 1 to 9, characterized in that the annular cavity between the inner (14) and the jacket pipe (16) is filled with polyurethane foam (26).