SU514987A1 - Prestressed tube - Google Patents

Description

This invention relates to pipelines yes. QbiTb can be used in the construction of pipelines intended for the transport of hot water from steam. Oil products and heat carriers, across river, Canal, and other water barriers; Nowadays, when crossing over water barriers; pipelines with heat carriers lay E cneiiiaaribfabix tunnels or jackets coated with elastic thermal insulation (glass wool) and with a device for temperature compensators to change the pipeline length ..:; The construction of such pipelines is difficult and expensive. I; On underwater crossings, it is also known to have no pipeline laying with; waterproof concrete pavement. However, such pipelines are used at a constant temperature regime or its greatest change, i.e., when product | (liquid or gas) at natural temperatures j. With a significant increase in the temperature of the product (heat carrier) as compared to the ambient temperature, the pipeline is heated and lengthened, breaking the concrete coating that has a weak i resistance. Stretch is stretchable. {Shbm for drilling, the strength of which is ensured by the prestressing stress transmitted through the high-strength rods. ; The purpose of the invention is to reduce the temperature elongation of the pipeline and prevent the destruction of its concrete pavement. I This is achieved by the fact that the metal. pipes; —the components of the pipeline, in the process of their molding, first lined up and then solidified the concrete, i pinched it through the ribs attached to the i, preserving such elongation. There is a pipeline section consisting of metal pipe 1. I metal fins 2 and concrete pavement I 3 with steel reinforcement 4,

Pipe 1 consists of separate links welded to each other, 8-10 m long,

Ribs 2 are welded to pipe 1 for best pinching it in concrete.

Floor 3 is made of; concrete, which has a high compressive strength and low thermal conductivity, for example, caram-) concrete, ./

In the concrete pavement, along its contour, jq; Steel reinforcement 4 is located to prevent the concrete from flexing 1.- | ; efforts arising from the construction of the pipeline.

Each pipe link | Ы when concreting

lengthens by the amount of its possible thermal lengthening during operation at the maximum temperature of heat-transfer agents. Pipe links, natfimer, are removed with the help of special tension devices.

Concrete links are transported to the place of their laying and are combined there in sections by welding the ends of pipes and fittings inserted from concrete. The welded butt joints ib i i in place. The pipeline is inserted into the previously opened tranj neck and is sewn up with soil.

When piping the heat carrier - / l metal pipe is heated, but not, S &

lengthens due to its pre-lengthening process of embossing. . During heating, only the compressive stresses that occur in the pipe during its preliminary elongation are reduced.

The proposed pipe allows laying pipelines with a variable temperature regime without tunnels and covers, does not require the use of a protective lining when immersing the pipelines at the bottom of reservoirs, eliminates or drastically reduces the need for a device to compensate for

Claims (3)

1. A pre-stressed pipe with a concrete coating, distinguished by the fact that, for the purpose of chemical deformation, 1 & . 2. A tube according to Claim 1, characterized by -i in that the fins are shaped as a row ring shells arranged along: pipes with a certain step. 3. A pipe according to claim 1, that is, so that the ribs are made in the form of a helical spiral.