CN210153346U - Prevent directly buried heat supply pipeline for carrying hot water that heat preservation pine takes off - Google Patents
Prevent directly buried heat supply pipeline for carrying hot water that heat preservation pine takes off Download PDFInfo
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- CN210153346U CN210153346U CN201920780067.XU CN201920780067U CN210153346U CN 210153346 U CN210153346 U CN 210153346U CN 201920780067 U CN201920780067 U CN 201920780067U CN 210153346 U CN210153346 U CN 210153346U
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- supply pipeline
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Abstract
The utility model relates to a prevent direct-burried heat supply pipeline for hot water of transport that heat preservation pine takes off, including inside steel pipe, outside polyethylene outer jacket and through pouring into the polyurethane heat preservation that forms between steel pipe and polyethylene outer jacket, its characterized in that, add a spiral on the steel pipe surface and twine it and rather than the steel band of the spring of linking firmly, the steel band of the spring is by the steel band and along the steel band longitudinal center line equipartition perpendicularly link firmly a plurality of coil spring on it constitute; the distance between the top of the spiral spring and the polyethylene outer protective layer is greater than or equal to 1/5 of the thickness of the polyurethane heat-insulating layer. The utility model has the advantages that: the pipeline structure is stable, the heat insulation performance is reliable, the heat supply pipeline works safely and stably, and the service life is prolonged.
Description
Technical Field
The utility model relates to a heat supply pipeline technical field especially relates to a prevent direct-burried heat supply pipeline for transport hot water that heat preservation pine takes off.
Background
With the rapid development of urban modernization, the requirements for municipal pipeline construction are increasingly increased. At present, when municipal pipelines are laid, pipelines mostly adopt a direct-buried laying mode, and direct-buried heat preservation pipelines are laid in grooves filled with medium-fine sand. For a direct-buried high-temperature hot water heat supply pipeline with the temperature below 150 ℃, a prefabricated heat insulation pipeline is mostly adopted, and the concrete structure of the pipeline consists of a steel pipe as an internal working pipeline, a polyurethane heat insulation layer coated on the outer surface of the steel pipe and a polyethylene outer protection layer coated on the outer surface of the polyurethane heat insulation layer. During construction, liquid polyurethane is poured between the steel pipe and the polyethylene outer protective layer, and the solidified polyurethane, the steel pipe and the polyethylene outer protective layer are firmly combined together to form an integral structure.
However, in the above structure, when the axial internal force of the steel pipe is large due to thermal expansion and cold contraction, the polyurethane heat-insulating layer and the steel pipe are still loosened, so that the heat-insulating effect and the safe use of the pipeline are directly influenced.
How to provide a stable in structure, thermal insulation performance is reliable, ensures the safety and stability work, improves life's transport for hot water direct-burried heat supply pipeline and becomes industry's concern problem.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at improves on current direct burial heat supply pipeline structure basis to above-mentioned problem, provides a transport hot water with direct burial heat supply pipeline that heat preservation pine takes off, through set up at the steel pipe surface and take the spring steel band, realizes that pipeline structure is stable, thermal insulation performance is reliable, ensures to carry hot water with direct burial heat supply pipeline safety and stability work and improve life.
The utility model provides a technical scheme that its technical problem adopted is:
a directly-buried heat supply pipeline for conveying hot water and preventing a heat insulation layer from loosening comprises an inner steel pipe, an outer polyethylene outer protection layer and a polyurethane heat insulation layer formed between the steel pipe and the polyethylene outer protection layer in a pouring mode.
The distance between the top of the spiral spring and the polyethylene outer protective layer is greater than or equal to 1/5 of the thickness of the polyurethane heat-insulating layer.
The steel belt is made of the same material as the steel pipe; the width of the steel strip is 20-50mm, and the thickness is 0.1-0.2 mm; the distance between adjacent steel belts is 50-200 mm; the diameter of the spiral spring is 20-50mm, the pitch is 8-10mm, and the distance between adjacent spiral springs on the steel belt is 50-200 mm; the diameter of the spring steel wire of the spiral spring is 0.5-4 mm.
The utility model has the advantages that: compared with the prior art, the utility model provides a carry hot water with direct-burried heat supply pipeline owing to add a spiral winding on it and rather than the strip spring steel band that links firmly at the steel pipe surface, especially through a plurality of coil spring, closely fuse together with polyurethane, make its firm fixation in the steel pipe outside. In fact, the steel belt with the spring obviously improves the surface roughness of the steel pipe, increases the friction area between the steel pipe and the polyurethane protective layer, increases the friction resistance, and is firm in fixation and reliable in positioning. Like this, during operation, even the steel pipe is great because of expend with heat and contract with cold axial internal force, can not take place polyurethane heat preservation and the condition that takes off with the steel pipe pine yet, ensure the safe handling of heat preservation effect and pipeline, improve heat supply pipeline's working life. The utility model discloses simple structure, maneuverability is strong, suitable popularization.
Drawings
FIG. 1 is a schematic sectional view of the present invention;
FIG. 2 is a side view of FIG. 1;
fig. 3 is a schematic view of the structure of the sprung steel band.
In the figure:
the steel pipe comprises a polyethylene outer protective layer 1, a polyurethane heat-insulating layer 2, a spring-provided steel belt 3, a spiral spring 31, a steel belt 32 and a steel pipe 4.
The present invention is described in detail below with reference to the attached drawings and examples.
Detailed Description
Fig. 1-3 show a prevent that heat preservation pine takes off transport hot water with directly burying heat supply pipeline, including inside steel pipe 4, outside polyethylene outer jacket 1 and through pouring into the polyurethane heat preservation 2 that forms between steel pipe 4 and the polyethylene outer jacket 1 the utility model is characterized in that 4 surfaces of steel pipe add a spiral winding on it and rather than the area spring steel band 3 that links firmly, area spring steel band 3 comprises steel band 32 and a plurality of coil spring 31 along the vertical central line equipartition of steel band and link firmly on it perpendicularly.
The utility model is further characterized in that the distance between the top of the spiral spring 31 and the polyethylene outer protective layer 1 is more than or equal to 1/5 of the thickness of the polyurethane heat-insulating layer 2. I.e. to ensure that the coil spring 31 is completely embedded in the polyurethane insulation layer 2.
The utility model is also characterized in that the steel belt 32 is made of the same material as the steel pipe 4, and Q235B carbon steel can be adopted. As shown in fig. 2 to 3, the steel strip 32 has a width of 20 to 50mm and a thickness of 0.1 to 0.2 mm; the distance L1 between the adjacent steel strips 32 is 50-200 mm; the diameter D of the spiral spring 31 is 20-50mm, the pitch h is 8-10mm, the distance L2 between adjacent spiral springs 31 on the steel belt 32 is 50-200mm, and the diameter of the spring steel wire of the spiral spring is 0.5-4 mm.
In actual construction, the utility model discloses the preparation concrete step is as follows:
1. firstly, prefabricating the steel belt 3 with springs, uniformly arranging a plurality of spiral springs 31 along the longitudinal central line of the steel belt 32, and vertically fixing the spiral springs 31 on the steel belt 32 through spot welding. According to the diameter of the steel pipe 4, the thickness of the polyurethane heat-insulating layer 2 and the specific working condition of the pipeline, the width and the thickness of the steel belt 32, the diameter D and the pitch h of the spiral spring 31, the distance L2 between the adjacent spiral springs 31 on the steel belt 32 and the diameter of the spring steel wire adopting the spiral spring are all selected to be adjusted and changed adaptively. In practical application, the width of the steel strip 32 is 20-50mm, and the thickness is 0.1-0.2 mm; the diameter D of the spiral spring 31 is 20-50mm, the pitch h is 8-10mm, the distance L2 between adjacent spiral springs 31 on the steel belt 32 is 50-200mm, and the diameter of the spring steel wire of the spiral spring is 0.5-4 mm.
2. And winding the steel strip 3 with a spring outside the steel pipe 4, spirally winding the steel strip 3 with a spring on the outer surface of the steel pipe 4, and fixing the steel strip 32 on the steel pipe 4 by spot welding. The distance L1 between adjacent steel belts 32 is 50-200mm, which is determined according to the different diameters of the steel pipes 4, the thickness of the polyurethane heat-insulating layer 2 and the specific working conditions of the pipeline.
3. Sleeving a shell-shaped polyethylene outer protective layer 1 outside a steel pipe 4 wound with a spring steel belt 3, and firmly positioning the steel pipe 4 and the polyethylene outer protective layer 1 by arranging a supporting piece between the steel pipe 4 and the polyethylene outer protective layer; then the openings at the two ends are plugged to form a closed cavity.
4. And (3) forming a hole in the polyethylene outer protective layer 1, injecting liquid heat-insulating material polyurethane into a cavity between the polyethylene outer protective layer 1 and the steel pipe 4 from the hole, filling the liquid heat-insulating material polyurethane into the cavity, and condensing to form a polyurethane heat-insulating layer 2. At this time, the steel band 32, especially the plurality of coil springs 31, surrounding the steel pipe 1 is tightly fused with the polyurethane so as to be firmly positioned outside the steel pipe 1, and finally the opening is blocked.
To sum up, can see out, adopt the utility model provides a carry direct burial heat supply pipeline for hot water is owing to add a spiral winding on it and rather than the strip spring steel band 3 that links firmly at 4 surfaces of steel pipe, especially a plurality of coil spring 31 and polyurethane closely fuse together, make polyurethane heat preservation 2 firmly fix a position in the 1 outside of steel pipe. In fact, the surface roughness of the steel pipe 4 is remarkably improved by the steel belt with spring 3, the friction area between the steel pipe 4 and the polyurethane heat-insulating layer 2 is increased, the friction resistance is increased, and the fixation is firm. Like this, during operation, even the steel pipe is great because of expend with heat and contract with cold axial internal force, can not take place polyurethane heat preservation and the condition that takes off with the steel pipe pine yet, ensure the safe handling of heat preservation effect and pipeline, improve heat supply pipeline's working life.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the structure and shape of the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (3)
1. A directly-buried heat supply pipeline for conveying hot water and preventing a heat insulation layer from loosening comprises an inner steel pipe, an outer polyethylene outer protection layer and a polyurethane heat insulation layer formed between the steel pipe and the polyethylene outer protection layer in a pouring mode.
2. The direct burial heat supply pipeline for transporting hot water, which is capable of preventing the insulation layer from loosening as claimed in claim 1, wherein the distance between the top of the coil spring and the outer polyethylene protective layer is greater than or equal to 1/5 of the thickness of the polyurethane insulation layer.
3. The direct burial heat supply pipeline for transporting hot water, in which the thermal insulation layer is prevented from being loosened, according to claim 1 or 2, wherein the steel strip is made of the same material as the steel pipe; the width of the steel strip is 20-50mm, and the thickness is 0.1-0.2 mm; the distance between adjacent steel belts is 50-200 mm; the diameter of the spiral spring is 20-50mm, the pitch is 8-10mm, and the distance between adjacent spiral springs on the steel belt is 50-200 mm; the diameter of the spring steel wire of the spiral spring is 0.5-4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920780067.XU CN210153346U (en) | 2019-05-27 | 2019-05-27 | Prevent directly buried heat supply pipeline for carrying hot water that heat preservation pine takes off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920780067.XU CN210153346U (en) | 2019-05-27 | 2019-05-27 | Prevent directly buried heat supply pipeline for carrying hot water that heat preservation pine takes off |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210153346U true CN210153346U (en) | 2020-03-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920780067.XU Active CN210153346U (en) | 2019-05-27 | 2019-05-27 | Prevent directly buried heat supply pipeline for carrying hot water that heat preservation pine takes off |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210153346U (en) |
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2019
- 2019-05-27 CN CN201920780067.XU patent/CN210153346U/en active Active
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