The technical solution relates to the construction of pipelines - more precisely, to the rings of the safety, the dielectric intended for protection against mechanical damage of the insulating coating of the pipeline through the transition box under roads and railways and other engineering structures. Summary of the utility model: safety ring consisting of segments 1, 2 mounted on the conduit for pulling within the sleeve 3 has supporting ribs 4, which are mounted in roller support 5 consisting of the roller 6, for example the bearing is mounted on the axis 7. The ring precautionary It was prepared as follows. Ring segments made of polyurethane prepolymer based on DCCH PFL-100 by pouring into a mold. Rollers of the roller bearings mounted in a supporting rib segment on the axle by means of fasteners (e.g. cotter pins and washers). Segments with roller bearings fastened to each other by bolts to form a ring and mounted on the tube perimeter. The size and number of ring segments, and the number of rings on the pipe determined based on the pipe diameter, the thickness of the insulating coating and physico-mechanical characteristics of the polyurethane. The ring works as follows. When the dragging of the pipeline 2 with the collected thereon segments of the ring 1 through the holder 3, the support roller 5 its roller 6 are supported on the inner surface of the case 3, and promote movement of the pipeline 2 via the welds protuberances and other irregularities; 3. The inner surface of the case facilitates the process of pulling the pipeline 2 via the holder 3 and thereby excluded mechanical damage of the insulating coating of the pipeline 2. The use of this technical solution allows to avoid damage to the insulating coating of the pipeline during its dragging over the transition sheath under roads and railways and other engineering facilities and as a result prevent the decline in the life of the pipeline. 1 Fig. 1, 2.
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