A thermal insulation pipe connecting structure with a glass fiber reinforced plastic outer protective pipe replacing a PE outer protective pipe

Abstract

The utility model discloses a kind of thermal insulation pipe connecting structures of glass steel outer protective pipe replacing PE outer protective pipe, relate to thermal insulation pipeline connecting technical field. Including center work steel pipe, glass steel outer protective pipe, prefabricated glass steel pipe, water stop and insulating layer, prefabricated glass steel pipe, glass steel outer protective pipe and insulating layer are sequentially coaxially arranged on the surface of center work steel pipe from outside to inside, wherein, prefabricated glass steel pipe is slidably arranged on the surface of glass steel outer protective pipe, glass steel outer protective pipe replaces original PE outer protective pipe, glass steel has excellent temperature resistance, anti-aging and high-strength characteristics, solve the problem that PE outer protective pipe is poor in heat resistance, easy to age, easy to deform, expand the application of thermal insulation pipe in high-temperature medium conveying scene etc., and glass steel is light and has good rigidity, make prefabricated pipe sliding more smoothly, positioning more accurate, resin putty is compatible with glass steel, reliable plugging and appearance is smooth after repair.

Description

Technical Field

[0001] This utility model relates to the field of insulated pipe connection technology, specifically to an insulated pipe connection structure in which a fiberglass outer protective pipe replaces a PE outer protective pipe. Background Technology

[0002] Most existing thermal insulation pipes use PE outer protective pipes for end connections, but this has obvious limitations in connection and use:

[0003] 1. Insufficient heat resistance: When the medium temperature is high, the PE outer protective tube is prone to softening and deformation, which can damage the joint seal and lead to joint failure.

[0004] 2. The construction is complex, relies on hot-melt welding, requires specialized equipment, and the welding quality is unstable;

[0005] 3. Poor aging resistance; prone to cracking after long-term outdoor exposure; rapid failure of the interface sealing layer; and accelerated aging of the insulation layer due to moisture intrusion.

[0006] In view of the defects of existing PE outer protective pipe connections, this utility model aims to provide a connection method for insulation pipes adapted to fiberglass outer protective pipes, solving problems such as insufficient heat resistance, complex construction, and poor aging resistance, and achieving efficient connection and long-term stable operation of insulation pipe interfaces. Utility Model Content

[0007] This utility model relates to the field of insulated pipe connection technology, and discloses an insulated pipe connection structure after replacing the PE outer protective pipe with a fiberglass outer protective pipe. The structure adapts to the rigidity, lightweight, temperature resistance and aging resistance characteristics of the fiberglass outer protective pipe through steps such as pre-installation of pre-fabricated fiberglass pipe, positioning and end sealing, insulation restoration and injection hole repair. It achieves efficient connection of the insulated pipe interface and ensures the continuity of insulation, and solves the problems of insufficient heat resistance, complex construction and poor aging resistance of existing PE outer protective pipes.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a connection structure for a heat insulation pipe in which a fiberglass outer protective pipe replaces a PE outer protective pipe, comprising:

[0009] The central working steel pipe, the fiberglass outer protective pipe, the precast fiberglass pipe, the water blocker, and the insulation layer are arranged coaxially on the surface of the central working steel pipe from the outside to the inside. The precast fiberglass pipe is slidably arranged on the surface of the fiberglass outer protective pipe.

[0010] Customized prefabricated fiberglass pipes are fitted over the outer fiberglass outer protective pipe, replacing the original PE outer protective pipe. Utilizing the superior rigidity and lighter weight of fiberglass compared to PE, a sliding gap is reserved between the prefabricated fiberglass pipe and the fiberglass outer protective pipe, ensuring structural stability and facilitating installation.

[0011] Furthermore, the water blocker is arranged in a ring shape within the insulation layer, and is located near the connection end of the central working steel pipe.

[0012] Furthermore, a gap is left between the fiberglass outer protective tube and the precast fiberglass pipe to allow the precast fiberglass pipe to slide.

[0013] Further, the connection end of the central working steel pipe is exposed outside the insulation layer for a certain distance, and an injection hole is opened in the middle of the prefabricated fiberglass pipe to fill the partition at the connection end of the central working steel pipe with the same material as the insulation layer for sealing.

[0014] After the central working pipe is welded, the precast fiberglass pipe is slid along the gap to center it over the interface of the two fiberglass outer protective pipes. An injection hole is opened in the middle of the precast pipe, and insulation material of the same material as the original insulation layer is injected. Taking advantage of the fact that fiberglass has better temperature resistance than PE, it is suitable for injection construction scenarios with higher temperatures and avoids deformation of the outer protective pipe. After the insulation material has cured, the injection hole is repaired with resin putty. Relying on the smooth surface of fiberglass, it is easier to achieve a continuous appearance after repair.

[0015] Further, after the prefabricated fiberglass pipes are moved to the partition, a special resin putty is applied to the surface and a mesh cloth is laid to enhance the strength. The joints are sealed with fiberglass-specific resin putty in conjunction with the mesh cloth: the resin putty is chemically compatible with fiberglass and can fill gaps; the mesh cloth enhances the sealing strength, and relying on the rigidity of fiberglass, the sealing is more durable, avoiding seal failure due to deformation.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The insulation pipe connection structure that replaces the PE outer protective pipe with a fiberglass outer protective pipe uses prefabricated fiberglass pipes. Fiberglass has excellent temperature resistance, aging resistance, and high strength, which solves the problems of poor heat resistance, easy aging, and easy deformation of PE outer protective pipes. This expands the application of insulation pipes in high-temperature media transportation scenarios. In addition, fiberglass is lightweight and has good rigidity, which makes the prefabricated pipe slide more smoothly and the positioning more accurate. Resin putty is compatible with fiberglass, so the sealing is reliable and the appearance is smooth after repair.

[0018] Meanwhile, by restoring insulation through interface injection and combining it with the stability of fiberglass, the "thermal bridge" effect is completely eliminated, ensuring the long-term operating efficiency of the pipeline. The combination of the rigidity of fiberglass and the resin seal makes its resistance to deformation and aging far superior to PE, significantly extending the service life of the pipeline. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model.

[0020] In the diagram: 1. Central working steel pipe; 2. Fiberglass outer protective pipe; 3. Precast fiberglass pipe; 4. Water blocker; 5. Insulation layer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Existing technical solutions based on PE outer protective pipes have several drawbacks. They are heavier than fiberglass, making manual sliding operations inconvenient; the material is prone to deformation, leading to large positioning errors when prefabricated pipes cover the joints; the lack of rigid support makes the sealing layer prone to cracking, resulting in seal failure; they soften easily at high media temperatures, making it difficult to stabilize the supporting structure; and their poor surface flatness and low hardness make it difficult to align with the prefabricated pipe after filling and grinding the injection holes, affecting not only appearance but also potentially weakening the integrity of corrosion protection and insulation. Overall, the construction efficiency and structural reliability are inferior to fiberglass outer protective pipe solutions.

[0023] like Figure 1 As shown, this utility model provides a technical solution: A prefabricated fiberglass pipe 3 is customized according to the specifications of the replaced fiberglass outer protective pipe 2 to adapt to the size and characteristics of the fiberglass outer protective pipe 2. Before hoisting, the prefabricated fiberglass pipe 3 is fitted onto the fiberglass outer protective pipe 2. Because fiberglass is lighter than PE, it is easier to manually slide and weld the center working steel pipe 1 according to conventional flaw detection standards to ensure welding quality. This step is independent of the material of the outer protective pipe. After welding, the prefabricated fiberglass pipe 3 is slid and precisely centered to cover the interface through markings. Because fiberglass is not easily deformed, the positioning error is smaller. With higher precision, a special resin putty for fiberglass is applied, and a mesh cloth is laid to enhance strength. Relying on the rigid support of fiberglass, the sealing layer is less prone to cracking, and the seal is more durable, solving the problem of sealing failure caused by deformation of PE outer protective pipe. An injection hole is opened, and insulation material is injected. If the medium temperature is high, the fiberglass outer protective pipe 2 can still provide stable support, avoiding the risk of softening of PE outer protective pipe. After the insulation material cures according to its properties, the next step is to fill the injection hole with resin putty. Because the surface of fiberglass is flat and has high hardness, it is easier to be flush with the precast pipe after sanding, thus completing the connection.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A connection structure for a heat-insulating pipe where a fiberglass outer protective pipe replaces a PE outer protective pipe, characterized in that, include: The central working steel pipe (1), the fiberglass outer protective pipe (2), the prefabricated fiberglass pipe (3), the water blocker (4), and the insulation layer (5); The precast fiberglass pipe (3), the fiberglass outer protective pipe (2) and the insulation layer (5) are coaxially arranged on the surface of the central working steel pipe (1) from the outside to the inside, wherein the precast fiberglass pipe (3) is slidably arranged on the surface of the fiberglass outer protective pipe (2).

2. The insulation pipe connection structure for replacing PE outer protective pipe with fiberglass outer protective pipe according to claim 1, characterized in that: The water blocker (4) is arranged in a ring shape inside the insulation layer (5), and the water blocker (4) is located at the connection end near the central working steel pipe (1).

3. The insulation pipe connection structure for replacing the PE outer protective pipe with a fiberglass outer protective pipe according to claim 1, characterized in that: A gap is left between the fiberglass outer protective tube (2) and the precast fiberglass pipe (3) for the precast fiberglass pipe (3) to slide.

4. The insulation pipe connection structure for replacing PE outer protective pipe with fiberglass outer protective pipe according to claim 1, characterized in that: The connecting end of the central working steel pipe (1) is exposed outside the insulation layer (5) for a certain distance. The prefabricated fiberglass pipe (3) has an injection hole in the middle, which is used to fill the partition of the central working steel pipe (1) with the same material as the insulation layer (5) for sealing.

5. The insulation pipe connection structure for replacing PE outer protective pipe with fiberglass outer protective pipe according to claim 1, characterized in that: After the precast fiberglass pipe (3) is moved to the partition, its surface is coated with special resin putty and a mesh cloth is laid to enhance its strength.

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