CS217273B1 - Mobile belt for mechanic protection of isolated burried pipeline - Google Patents

Abstract

Strip for mechanically protecting an insulated, underground pipe conduit, e.g. against falling stones, consists of a layer, >=1 mm thick, made of a mixt. contg. (a) 10-99.8% atactic polypropylene, dehydrated by heating to 100-70 degrees C and then cooled by 1-70 degrees C, (b) 0.1-40% loose fillings, reinforced with fibrous material stronger than the mixt. itself, and 0.1-50% rubber soln. in an organic solvent, in wt. ratio 1-50 to 50-99. Mechanical damage in a rocky soil can be reduced without soil pre-treatment and/or without the use of a specific loose material. A cheap, light strip can be obtd. from readily available waste materials.

Description

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Portable belt for mechanical protection of insulated storage pipes

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable belt for medical engineering. protecting insulated storage pipes, in particular to provide protection against the meehanic influence of rocky fillings.

Until now, insulated conduits have been protected by wood battens or arctic polypropylene, with a filler, or an additional wrapping layer of insulating material has been applied in places exposed to strong mechanical effects of stone fillings. from the bandage made of meehannically resistant plastic hmooy, eventually the irreversible mechanical influence of soils was prevented by sifting or importing loose material into the delivery groove. In other cases, the mechanical protection of the storage pipeline insulation was carried out by underlaying the line with used pnernnaatkami, eventually. old or worn conveyor belts.

In the case of protection by means of wooden reinforcement, the disadvantage of the procedure is the small production of the Ukivi's work, besides the wooden cage - it does not provide meehanic protection to the solid parts in the soil of all sizes around the pipe. Stones that are smaller in size than the wooden lattice size will spring up to the surface of the insulation, which can damage the layers of the layers. In addition, this method of light protection is expensive.

Arctic Poožijjeai the molten polypropylene or waste · · lelatiitujl so formed insulation layer is sufficiently resistant to mechanical action -tlaku stones zem.ně pouLuiií _C In this method, new insulation need condole also the temperature of the molten atactic polypropylene or while too high temperature - above In particular, plastic insulating tapes can be subjected to a temperature reduction of 150 ° C.

Another wrapping layer, which is produced in a thickness of up to 1.0 mm, is both costly and secondly, in the thickness used does not ensure sufficient mehanic resistance to smaller stones, such as up to 1 kg, when the backfilling and impact of stone edge can break both layers of insulation up to the metal of the pipe. The use of material for the conveying of pipelines is highly costly, and the import of sufficient bulk bulk material is practically unmilled in some sections of the route. In the case of used pneumatic tires, the insulation of the pipe laid in the soil only provides protection at the lower part thereof, i.e. at the points supported by the peniums, while at other places the pipe insulation remains unprotected against the mehanic lines of the fixed sums. Also, the use of worn rubber belts from conveyor belts is only a partial solution for reliable insulation protection. On the one hand, these discarded conveyor belts are very heavy, which exacerbates the problems associated with their conveyance to the pipeline construction site and, on the other hand, there are not enough of them.

These disadvantages are overcome by the object of the invention, which consists in that the transfer belt consists of a cooled melt composed of a 1 to 20 mm thick layer composed of a mixture of 50 to 50 mm. 99.8% Arctic polypropylene. water-free, from a 0.1 to 10% solution of a rubber in an organic solvent in a ratio of 1 to 50% by weight, parts to 99 to 50 parts by weight, and from 0.01 to 40% bulk filler, reinforced with a liner. An electrically nonconductive lump material having a particle size of up to 3 cm, preferably in the form of a grandiose, is anchored on its surface.

The strip according to the invention has the particular advantage that it is not elastic, but also has a high resistance, is lower and has a lower weight than the protective layers used hitherto. It is made from waste matrix, which is present in sufficient quantities. The use of the inventive belts reduces the risk of mechanical damage to the pipe insulation to less than 2 mm, eliminates the sifting of soil or the introduction of loose material into the groove. The electrically non-conductive granules anchored to the surface of the dispersion belt upon impact impact the kinetic energy of the incident body and thus substantially increase the efficiency from that. The blend of the present invention is permeated with an insect which has no bearing meaning, but further disperses the Mehadhad impact on a larger area and virtually prevents the insulation from breaking through. .

Example 1

100 g of waste arctic polypropylene was melted at temperature while stirring

155 ° C for 30 min. This time is sufficient to evaporate the water contained in the atactic polypropylene. Then, the melt was cooled to 120 ° C and the melt was metered in as an addition of 20 g of waste ash. At 120 ° C it was melted and heated for a period of time. 10 minutes. This time is sufficient to escape the air introduced into the melt with the powdered filler.

After cooling the resulting melts to 100 ° C, 5 g was metered into the mixture.

ALKAPREN 200, diluted with 100 cmr of irichlorrtylene, equivalent to 2.5 g of chloroprene.

At 100 ° C. the melt was heated for 20 minutes. This one. the time is almost 100% to evaporate the irisylthyrene and toluene contained in the mixture thus prepared.

The resulting melt was cast 3 layers of PVC mesh. Due to the rapid heat dissipation and the sharp drop in the melt temperature, there is no depolymerization or thermal degradation of the polyvinyl chloride.

Example 2

In the same manner as in Example 1, a melt of waste atactic polypropylene, filler and ALCAPREN 200 was prepared.

This melt was poured into 2 layers of PVC mesh for the manufacture of packages with a fiber thickness of 1 mm. At a melt temperature of 110 ° C, granules of electrically non-conductive waste isotactic polypropylene MOSTEN 58.412 having a particle size of 0 _t 2 to 0.4 cm were anchored to its surface. It is an oversize fraction, waste in the production of isotactic polypropylene. By partially melting these granules, a protective layer resistant to mechanical damage was formed while the elastic nature of the protective strip began.

Example 3

In the same manner as in Example 1, a melt was prepared from waste atactic polypropylene, filler and ALCAPRIS 200.

This melt was embedded in the paraffin shavings, aligned to form a continuous layer. These shavings have on one side a layer of plastic which even breaks down the kinetic energy of the impact.

Claims (1)

SUBJECT OF THE INVENTION Portable belt for mechanical protection of insulated storage piping, characterized in that it consists of a cooled melt composed of 1 mm to 20 mm thick layer consisting of a mixture of 50 to 99.8% water-free atactic polypropylene, of 0.1 to 10% solution rubber in organic solvent in a ratio of 1 to 50 wt. parts to 99 to 50 wt. parts and up to 0.01 to 40% bulk filler, reinforced with a liner mechanically more resistant than the mixture, and an electrically non-conductive lump material of particle size up to 3 cm, preferably in the form of granules.