HDMP double-wave steel strip reinforced composite pipe

Abstract

The utility model relates to the technical field of pipes, and particularly discloses an HDMP double-wave steel strip reinforced composite pipe which comprises an inner pipe, an outer wall and a steel strip layer, the outer wall is of a hollow annular corrugated structure, the steel strip layer is provided with a corrugated structure matched with the outer wall in structure, the steel strip layer is arranged outside the inner pipe, and the outer wall of the inner pipe is of a hollow annular corrugated structure. The steel belt layer is bonded with the inner pipe and the outer wall through bonding resin, the inner pipe is of a multi-layer structure and provided with a first heat preservation layer, polypropylene resin layers are arranged on the inner side and the outer side of the first heat preservation layer, the first heat preservation layer is made of hard polyurethane, the first heat preservation layer is tightly attached to the polypropylene resin layers on the inner side and the outer side of the first heat preservation layer, and the polypropylene resin layers on the inner side and the outer side of the first heat preservation layer. The outer wall is made of a high-density polypropylene resin material, the section of the steel belt layer is in an M shape, the steel belt layer is provided with two wave crests, a second heat preservation layer is arranged in a wave trough of a corrugated structure of the outer wall, the second heat preservation layer is connected with the outer wall through adhesive resin, and the heat preservation performance of the pipeline is enhanced by arranging the heat preservation layers made of polyurethane materials in the inner pipe and on the outer side of the pipeline.

Description

Technical Field

[0001] This utility model relates to the field of pipe technology, specifically to an HDMP double-wave steel strip reinforced composite pipe. Background Technology

[0002] Steel strip pipes have a wide range of applications, such as municipal engineering, buried drainage pipeline engineering, municipal sewage pipeline engineering, road rainwater drainage engineering, seepage and drainage pipes for railways and highways, rainwater pipes and underground drainage pipes for industrial and building engineering, drainage and sewage discharge for large ports, airports and docks, ventilation and air supply and cement slurry discharge in mines, drainage and irrigation for farmland, orchards and tea gardens, etc.

[0003] Patent CN208997492U discloses an HDMP double-wave steel strip reinforced composite pipe, comprising a base pipe with at least one pressure-bearing portion and at least one expansion portion alternately sleeved on the base pipe. The base pipe has a smooth and flat structure. The pressure-bearing portion sequentially comprises a polypropylene resin outer wall, an adhesive resin layer, a steel strip layer, and an adhesive resin layer. The polypropylene resin outer wall is configured with a hollow annular corrugated structure. The steel strip layer is configured with a corrugated structure matching the structure of the polypropylene resin outer wall. The steel strip layer includes two wave peaks and a wave peak connecting portion connecting the wave peaks. The steel strip layer is bonded to the outer wall of the polypropylene resin through an adhesive resin layer. The corrugated connection part of the steel strip layer is bonded to the outer wall of the polypropylene resin and the base pipe through the adhesive resin layer. The cross-section of the steel strip layer is set as M-shaped, which increases the pressure area of ​​the steel strip layer. The corrugated part of the steel strip layer is Λ-shaped, which increases the pressure area of ​​the steel strip and can effectively disperse the stress on the steel strip layer. The double corrugated setting of the steel strip layer means that there is a corrugated connection part parallel to the axis of the steel strip reinforced composite pipe between the corrugated parts. The corrugated connection part can disperse the pressure that is not mitigated by the corrugated part of the steel strip to a limited extent, which can effectively reduce the pressure on the base pipe caused by the pressure that is not dispersed by the corrugated part.

[0004] However, the composite pipes themselves do not provide insulation. When used in low-temperature environments, such as when the pipe laying depth is not below the frost line or when part of the pipe is exposed above the ground, in order to prevent the water inside the pipe from freezing due to excessively low temperature, causing blockage and affecting drainage, it is necessary to lay an insulation layer around the pipe or wrap the pipe with insulation cotton, which increases construction costs. Utility Model Content

[0005] To address the shortcomings of existing technologies, the technical problem solved by this utility model is to provide an HDMP double-wave steel strip reinforced composite pipe, which solves the problem of the existing HDMP double-wave steel strip reinforced composite pipe not providing insulation.

[0006] To solve the above problems, the technical solution adopted by this utility model is: an HDMP double-wave steel strip reinforced composite pipe, including an inner tube, an outer wall, and a steel strip layer. The outer wall has a hollow annular corrugated structure, and the steel strip layer has a corrugated structure that matches the structure of the outer wall. The steel strip layer is disposed outside the inner tube and is bonded to the inner tube and the outer wall respectively by adhesive resin. The inner tube has a multi-layer structure and has a first insulation layer. The inner and outer sides of the first insulation layer are polypropylene resin layers.

[0007] The beneficial effects of this solution are: by setting a first insulation layer inside the pipe, the insulation performance of the pipe is enhanced. When the pipe is installed in a low-temperature environment, the insulation effect can be achieved without laying an insulation layer, effectively preventing the water in the pipe from freezing due to excessively low temperature.

[0008] Furthermore, the first insulation layer is made of rigid polyurethane. Polyurethane has a low thermal conductivity and excellent thermal insulation performance, which enables the pipeline to have a thermal insulation effect and can prevent the water in the pipeline from freezing due to excessively low temperature.

[0009] Furthermore, the first insulation layer is tightly bonded to the polypropylene resin layers on its inner and outer sides, which can be achieved by prefabricating the first insulation layer and then covering both sides with polypropylene resin or by injecting polyurethane foam into the inner cavity of the double-layer polypropylene resin tube.

[0010] Furthermore, the outer wall is made of high-density polypropylene resin material, which has excellent pressure resistance and corrosion resistance, providing protection for the steel strip layer and extending the service life of the pipeline.

[0011] Furthermore, the steel strip layer has an M-shaped cross-section with two peaks, which increases the pressure-bearing area of ​​the steel strip layer and improves the ring stiffness of the pipeline.

[0012] Furthermore, a second insulation layer is provided within the troughs of the corrugated structure of the outer wall. The second insulation layer is connected to the outer wall by adhesive resin, thereby enhancing the insulation effect of the pipe.

[0013] Furthermore, the second insulation layer is made of rigid polyurethane material, and its thickness is one-third to one-half of the depth of the outer wall trough, which reduces the pressure on the second insulation layer from the outside of the pipe and prevents the insulation layer from being damaged. Attached Figure Description

[0014] Figure 1 This is a partial cross-sectional schematic diagram of the HDMP double-wave steel strip reinforced composite pipe of this utility model;

[0015] In the diagram: 1-inner tube, 2-outer wall, 3-steel strip layer, 4-adhesive resin, 5-second insulation layer, 11-polypropylene resin layer, 12-first insulation layer. Detailed Implementation

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] Implementation, for example, attached Figure 1 As shown: An HDMP double-wave steel strip reinforced composite pipe includes an inner tube 1, an outer wall 2, and a steel strip layer 3. The outer wall 2 has a hollow annular corrugated structure. The steel strip layer 3 has a corrugated structure that matches the structure of the outer wall 2. The steel strip layer 3 is disposed outside the inner tube 1. The steel strip layer 3 is bonded to the inner tube 1 and the outer wall 2 respectively by adhesive resin 4. The inner tube 1 has a multi-layer structure and is provided with a first insulation layer 12. The inner and outer sides of the first insulation layer 12 are polypropylene resin layers 11.

[0018] The first insulation layer 12 is made of rigid polyurethane. Polyurethane has a low thermal conductivity and excellent thermal insulation properties, giving the pipeline an insulation effect and preventing the water inside the pipeline from freezing due to excessively low temperatures. The first insulation layer 12 is tightly bonded to the polypropylene resin layers 11 on its inner and outer sides. This can be achieved by prefabricating the first insulation layer 12 and then covering both sides with polypropylene resin, or by injecting polyurethane foam into the inner cavity of the double-layer polypropylene resin pipe. The outer wall 2 is made of high-density polypropylene resin material. High-density polypropylene resin has excellent pressure resistance and corrosion resistance, providing protection for the steel strip layer 3 and extending the service life of the pipeline. The steel strip layer 3 has an M-shaped cross-section. Having two peaks increases the pressure-bearing area of ​​the steel strip layer 3, which can improve the ring stiffness of the pipeline. The second insulation layer 5 is provided in the trough of the corrugated structure of the outer wall 2. The second insulation layer 5 is connected to the outer wall 2 by adhesive resin 4. The second insulation layer 5 and the first insulation layer 12 wrap the pipeline, which can enhance the insulation effect of the pipeline. The second insulation layer 5 is made of rigid polyurethane material, and its thickness is one-third to one-half of the depth of the trough of the outer wall 2. The contact area between the second insulation layer 5 and the soil covering outside the pipeline is small. The outer wall 2 and the steel strip layer 3 bear most of the pressure from the ground, reducing the pressure on the second insulation layer 5 from the outside of the pipeline, which can effectively prevent the insulation layer from being damaged.

[0019] The specific implementation process is as follows: The inner pipe 1 is set with a multi-layer structure, the middle layer is the first insulation layer 12, the high-density polypropylene material on both sides provides protection for the insulation layer, and the outer side of the pipe is set with a second insulation layer 5. The insulation layer material is rigid polyurethane material with extremely low thermal conductivity, and the density of rigid polyurethane is 35-40 kg / m³. 3At this temperature, its thermal conductivity is 0.018~0.024W / (m·k), and it can be used in environments with temperatures ranging from -60℃ to +120℃. It can enhance the thermal insulation performance of pipelines. When pipelines are installed in low-temperature environments, they can achieve the thermal insulation effect without laying an insulation layer, effectively preventing the water in the pipeline from freezing due to excessively low temperatures.

[0020] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A HDMP double-wave steel strip reinforced composite pipe, characterized in that: It includes an inner tube, an outer wall, and a steel strip layer. The outer wall has a hollow annular corrugated structure. The steel strip layer has a corrugated structure that matches the structure of the outer wall. The steel strip layer is disposed outside the inner tube. The steel strip layer is bonded to the inner tube and the outer wall respectively by adhesive resin. The inner tube has a multi-layer structure and has a first insulation layer. The inner and outer sides of the first insulation layer are polypropylene resin layers.

2. The HDMP double-wave steel strip reinforced composite pipe according to claim 1, characterized in that: The first insulation layer is rigid polyurethane.

3. The HDMP double-wave steel strip reinforced composite pipe according to claim 1, characterized in that: The first insulation layer is tightly bonded to the polypropylene resin layers on its inner and outer sides.

4. The HDMP double-wave steel strip reinforced composite pipe according to claim 1, characterized in that: The outer wall is made of high-density polypropylene resin material.

5. The HDMP double-wave steel strip reinforced composite pipe according to claim 1, characterized in that: The steel strip layer has an M-shaped cross-section with two peaks.

6. The HDMP double-wave steel strip reinforced composite pipe according to claim 1, characterized in that: A second insulation layer is provided within the troughs of the corrugated structure of the outer wall, and the second insulation layer is connected to the outer wall by adhesive resin.

7. The HDMP double-wave steel strip reinforced composite pipe according to claim 6, characterized in that: The second insulation layer is made of rigid polyurethane material, and its thickness is one-third to one-half the depth of the outer wall trough.

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