RU1803668C - Method for laying underground pipeline - Google Patents

Abstract

Usage: the construction of pipelines of various diameters in flooded and permafrost soils. SUMMARY OF THE INVENTION: a trench is opened and flexible bandages are laid at the bottom of the trench with a calculated pitch, onto which long, soft material is laid. Its sidewalls are bent to the walls of the trench, as a result of which a container is formed in which transverse partitions are created, lifting the bandages above the bottom of the trench. Fragments are filled with soil in the container and the soil is covered from above with overlapping sides of the container, after which the pipeline is laid on it and connected with soil. When the trench is flooded, the container is a ballasting plate and prevents the ascent of the pipeline. 3 ill.

Description

The invention relates to construction and may find application in the construction of pipelines of various diameters in flooded and permafrost soils.

The purpose of the invention is to increase the reliability of ballasting of pipelines laid in winter.

Creating partitions makes it possible to create such a construction of a shell in which the bandages, after closing with the tension of their ends, will tightly fit the pipeline from below, which will prevent them from weakening when filling the trench with soil and during operation.

1 shows a pipeline laid in a trench, a top view; figure 2 is a section along aa in the middle part of the container; in Fig.Z is a longitudinal profile of the laid pipeline.

On the recessed bottom 1, trenches 2 lay flexible bandages 3 with a calculated step, pre-secured their ends on the wall or berm of the trench, lay on them a material forming container 4 — fabric like Dornit, Terfil — with overlapping the bottom and walls of the trench with preliminary fastening to the walls of the trench bent sides 5 of the container 4.

To create partitions in the container 4, the bandages 3 together with the material are raised above the bottom 1 of the trench 2 to a height equal to 0.5-1.0 of the height of the container, and the bandages 3 and sidewalls 5 of the container 4 are temporarily fixed on the walls or berm of the trench 2.

The container 4 is filled with soil fragments 6, the bent sidewalls 5 of the container 4 are released and the soil is blocked from above by the sidewalls 5 of the container 4. Lay in

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trench pipe 7 and attach the container 4 to it with bandages 3 with their tension and fastening 8,

When the trench is flooded, the water entering the trench tends to push the pipeline up. However, the weight of the extended container and the backfill soil 9 placed above it will prevent this. In mineral soils, backfill soil is used as additional ballast to be poured into a trench and located above an extended container and pipeline.

The use of mineral soil located in containers under the pipeline as ballast also serves as a technical tool to protect the insulation coating of the pipeline when laying on the frozen foundation of the trench in the winter.

Claims (1)

SUMMARY OF THE INVENTION A method of laying an underground pipeline, which consists in extracting a trench, laying it out at the bottom with an estimated step flexible bandages, laying on them an extended soft material, the curved sides of which form a container with a width equal to the width of the bottom of the trench, filling it with ballast material, placing a pipeline on it, connecting the latter with container bandages with their tension and backfilling the trench, different the fact that previously in the container create partitions, for whereupon the bandages are raised above the bottom of the trench to a height equal to 0.5-1.0 of the height of the container, and fragments of soil are used as ballast material, which are overlapped with an overlap from above with sidewalls container, the height of the container being 0.4-0.6 times the diameter of the pipeline. Rigl