Wear-resistant prefabricated direct-burial thermal insulation pipe

Abstract

The utility model discloses a kind of wear-resistant prefabricated direct-burial heat preservation pipes, belong to pipeline conveying technical field, including heat preservation pipe body, the heat preservation pipe body is by outer sheath pipe, reinforcing pipe, inner tube and constant temperature pipe coaxial core set and is constituted, the inner wall of reinforcing pipe is equipped with the installation groove extending along its axial direction, the inside fixedly connected with reinforcing rib of installation groove, preferably, the inner wall of inner tube is coated with wear-resistant ceramic layer, the outside of heat preservation pipe body is also set with reinforcing ring, and it is installed and fixed by the stabilizing mechanism of fixed ring, fixed bolt and base composition. The utility model is by additionally reinforcing rib in reinforcing pipe inside, forms the reinforced combined pressure-bearing structure, significantly improves the overall structural strength and compression resistance of pipeline, solves the problem that existing technology pipeline is easily deformed under complex geological conditions, simultaneously, the wear-resistant ceramic layer of inner tube effectively resists medium wear, prolongs service life.

Description

Technical Field

[0001] This utility model relates to the field of pipeline transportation technology, and in particular to wear-resistant prefabricated direct-buried insulated pipes. Background Technology

[0002] Precast direct-buried insulated pipes, as a type of composite pipeline integrating transportation, insulation, and protection functions, have been widely used in fields such as centralized heating, petrochemicals, and industrial material transportation. By prefabricating the working steel pipe, insulation layer, and outer protective pipe into a single unit in the factory, it greatly simplifies on-site construction and improves the reliability of the pipeline system.

[0003] However, with the continuous expansion of application scenarios, the inherent structural limitations of traditional direct-buried insulated pipes are gradually being exposed when facing more demanding working conditions. Especially when directly buried in areas with complex geological conditions and heavy surface traffic loads, the pipelines need to withstand enormous external pressure. Ordinary steel-clad steel or plastic-clad steel structures have limited pressure-bearing capacity due to the combination of the outer protective pipe and the inner steel pipe. Under long-term cyclic loads and uneven settlement, they are prone to radial flattening, bending deformation, or even structural damage, seriously affecting the safe operation of the pipeline.

[0004] Furthermore, when transporting media containing a large number of solid particles, such as mine slurry, ash and slag water from thermal power plants, and slag from the metallurgical industry, the media will cause severe erosion and wear on the inner wall of the pipeline. Traditional insulated pipes only use ordinary carbon steel or alloy steel as the inner tube, and their wear resistance is insufficient to meet the long-term requirements of such high-wear conditions. This leads to rapid thinning of the inner wall of the pipeline, eventually causing it to be worn through and resulting in leakage accidents. This not only causes economic losses but may also lead to environmental pollution and safety risks.

[0005] Therefore, this utility model proposes a wear-resistant prefabricated direct-buried insulated pipe to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a wear-resistant prefabricated direct-buried insulated pipe, which aims to improve the problems of insufficient overall structural strength, easy flattening and deformation, and excessive wear of the inner pipe and short service life of the existing wear-resistant prefabricated direct-buried insulated pipe under complex geological conditions, as well as the problem of the inner pipe wearing out too quickly and having a short service life when transporting abrasive media.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a wear-resistant prefabricated direct-buried insulated pipe, comprising: an insulated pipe body, wherein the insulated pipe body includes an outer protective pipe, a reinforcing pipe, an inner pipe, and a constant temperature pipe; The inner wall of the reinforcing tube is provided with an installation groove, and a reinforcing rib is fixedly connected inside the installation groove; Furthermore, the reinforcing tube is coaxially disposed inside the outer protective tube, the inner tube is coaxially disposed inside the reinforcing tube, and the thermostatic tube is filled in the annular space formed between the reinforcing tube and the inner tube. Through this combination structure of adding reinforcing ribs inside the reinforcing tube, the pressure resistance and bending resistance of the entire pipeline are significantly enhanced. Preferably, the outer circumferential surface of the outer protective tube of the insulation pipe body is provided with reinforcing rings at intervals to further enhance the circumferential stiffness of the pipe. Preferably, the inner wall of the inner tube is coated with a wear-resistant ceramic layer to directly resist the erosion of highly abrasive media. Preferably, the internal structure of the thermostatic tube is a rigid porous foam structure layer, which has the functions of heat insulation and radial support. Preferably, it also includes a stabilizing mechanism, which includes a fixing ring that is detachably clamped to the outer circumferential surface of the outer protective tube for positioning and fixing the pipe during installation; Preferably, the retaining ring is an open ring structure with opposing flanges, and the stabilizing mechanism further includes a fixing bolt for passing through the opposing flanges to tighten the retaining ring; Preferably, the stabilizing mechanism further includes a base, which is fixedly connected to the bottom of the fixing ring to provide a stable support plane for the pipeline; Preferably, the bottom surface of the base is provided with threaded holes for anchoring the entire stabilizing mechanism to the foundation.

[0008] This utility model has the following beneficial effects: 1. This utility model forms an enhanced combined pressure-bearing structure by opening an installation groove on the inner wall of the reinforcing pipe and fixing and connecting reinforcing ribs. This solves the problem that existing direct-buried insulated pipes are not strong enough in terms of pressure and bending resistance under complex geological conditions and are easily flattened and deformed. It achieves the technical effect of significantly improving the overall structural strength and service life of the pipeline.

[0009] 2. This utility model solves the problem of premature failure of existing pipelines due to direct wear of the inner wall by coating the inner wall of the inner pipe with a wear-resistant ceramic layer. The high hardness of the ceramic layer directly resists the erosion of abrasive media, thus achieving the technical effect of extending the service life of the pipeline under high wear conditions.

[0010] 3. This utility model provides a reliable and convenient installation and fixing method by configuring a stabilizing mechanism consisting of a fixing ring, fixing bolts and a base. It solves the problems of inaccurate positioning and insecure fixing of existing pipelines during on-site installation, and achieves the technical effect of improving construction efficiency and installation stability. Attached Figure Description

[0011] Figure 1This is a perspective view of the wear-resistant prefabricated direct-buried insulated pipe proposed in this utility model; Figure 2 A schematic diagram of the reinforcing ring of the wear-resistant prefabricated direct-buried insulated pipe proposed in this utility model; Figure 3 A schematic diagram of the reinforcing pipe of the wear-resistant prefabricated direct-buried insulated pipe proposed in this utility model; Figure 4 for Figure 1 Enlarged view of point A in the middle; Figure 5 for Figure 1 Enlarged view of point B in the middle.

[0012] Legend: 1. Insulation pipe body; 101. Outer protective pipe; 102. Reinforcing pipe; 103. Reinforcing rib; 104. Mounting groove; 105. Constant temperature pipe; 106. Inner pipe; 2. Reinforcing ring; 3. Stabilizing mechanism; 301. Fixing ring; 302. Base; 303. Threaded hole; 304. Fixing bolt. Detailed Implementation

[0013] 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.

[0014] Reference Figures 1-5 The present invention provides an embodiment of a wear-resistant prefabricated direct-buried insulated pipe, comprising an insulated pipe body 1 as the main functional component of the pipe, and a stabilizing mechanism 3 for supporting and positioning the insulated pipe body 1 at the construction site; the stabilizing mechanism 3 externally embraces the insulated pipe body 1 at the location where it needs to be fixed, providing a reliable installation foundation for the pre-buried and long-term stable operation of the pipe. To solve the above technical problems, the insulation pipe body 1 adopts a specially reinforced multi-layer composite structure. The cross-sectional structure of the insulation pipe body 1 clearly shows the multi-layer coaxial structure. Specifically, the insulation pipe body 1 includes, from the outside to the inside, an outer protective pipe 101, a reinforcing pipe 102, a thermostatic pipe 105, and an inner pipe 106. The outer protective pipe 101 constitutes the outermost protective layer of the pipeline. The reinforcing pipe 102 is coaxially arranged inside the outer protective pipe 101 and is the main structural pressure-bearing layer. The inner pipe 106 is coaxially arranged inside the reinforcing pipe 102 and is the working pipeline that is in direct contact with the conveying medium. The thermostatic pipe 105 is filled in the form of a filler, completely filling the closed annular space formed between the inner wall of the reinforcing pipe 102 and the outer wall of the inner pipe 106. To fundamentally enhance the mechanical strength of the entire insulation pipe body 1, a plurality of mounting grooves 104 extending axially along the length of the inner wall of the reinforcing pipe 102 are uniformly formed. Inside each mounting groove 104, a long reinforcing rib 103 is securely connected by welding or snap-fitting. These reinforcing ribs 103, together with the pipe wall of the reinforcing pipe 102, form a composite section. The moment of inertia of this composite section is much greater than that of a regular circular pipe of the same wall thickness. This gives the insulation pipe body 1 extremely high bending stiffness and the ability to resist external radial pressure, effectively preventing permanent deformation such as bending and flattening when deeply buried or under heavy loads. As a preferred embodiment, in order to further enhance the ability of the insulation pipe body 1 to resist local concentrated loads, several solid circular reinforcing rings 2 can be spaced along the length of the pipe on the outer circumferential surface of the outer protective pipe 101 of the insulation pipe body 1. The reinforcing rings 2 are tightly fitted to the outside of the outer protective pipe 101. When the pipe is subjected to local pressure from hard objects such as stones, the reinforcing rings 2 can effectively distribute the load at that point to a larger pipe wall area, preventing the outer protective pipe 101 from being punctured or causing local dents. As another preferred embodiment, in order to achieve the wear resistance function of the pipeline, a dense and uniform wear-resistant ceramic layer is coated on the inner wall surface of the inner tube 106 by plasma spraying or other high-temperature sintering processes. The wear-resistant ceramic layer has extremely high hardness and chemical stability. When abrasive media with high flow rate flows through, the wear-resistant ceramic layer acts as a sacrificial layer to directly bear the scouring and erosion of the media, thereby protecting the metal matrix structure of the inner tube 106 from damage and greatly extending the service life of the pipeline. As another preferred embodiment, in order to achieve the dual functions of efficient heat preservation and stable support at the same time, the internal structure of the thermostatic tube 105 is a rigid porous foam structure layer. This structure layer is composed of a large number of closed micro bubble units. The gas inside the bubbles has an extremely low thermal conductivity, forming an excellent heat insulation barrier. At the same time, the rigid material constituting the bubble wall forms a robust skeleton structure, which can firmly support the inner tube 106 at the center of the reinforcing tube 102 and withstand the weight and radial vibration from the inner tube. As another preferred embodiment, in order to achieve convenient and reliable fixing of the pipeline at the construction site, this solution provides an independent stabilizing mechanism 3. The core component of the stabilizing mechanism 3 is a fixing ring 301. The fixing ring 301 has an inner arc-shaped working surface that matches the outer diameter of the outer protective pipe 101. During installation, the fixing ring 301 is detachably clamped to the outer circumferential surface of the outer protective pipe 101 from the outside to form a hugging state. Based on the aforementioned stabilizing mechanism 3, in order to apply an adjustable clamping force to the insulation pipe body 1, the specific structure of the fixing ring 301 is an open ring structure with opposing flanges. That is, the fixing ring 301 is not a closed ring, but has an opening on one or both sides, with flanges extending from both ends of the opening. The stabilizing mechanism 3 also includes a fixing bolt 304, which passes through a pre-set through hole on the two opposing flanges. By rotating the fixing bolt 304, the two flanges can be brought closer to each other, thereby tightening the ring opening of the fixing ring 301 and generating a strong radial clamping force on the insulation pipe body 1. Based on the aforementioned stabilizing mechanism 3, in order to provide a stable support plane, the stabilizing mechanism 3 also includes a base 302; the top of the base 302 is firmly fixed to the bottom outer edge of the fixing ring 301 by welding or other means. The base 302 usually has a wide and flat bottom surface, which is used to transfer the weight of the entire pipeline to the foundation or support. Furthermore, in order to firmly anchor the entire pipeline system to the foundation and prevent displacement, several threaded holes 303 are provided on the flat bottom surface of the base 302. During construction, the base 302, together with the insulation pipe body 1 it holds, can be firmly fixed to the concrete foundation or steel structure support by passing the anchor bolts through the threaded holes 303 and tightening them.

[0015] Working principle: When this equipment is used, the multi-layer structure inside the insulation pipe body 1 achieves functions such as wear resistance and pressure resistance. The reinforcing ring 2, which is fixedly connected to the side wall of the insulation pipe body 1, ensures that the equipment is not easily deformed during use. At the same time, the insulation pipe body 1 is fixedly installed inside the stabilizing mechanism 3. The stabilizing mechanism 3 further stabilizes the insulation pipe body 1 and facilitates pre-embedding. The outer protective pipe 101 is made of modified high-density polyethylene, serving as the outermost wear-resistant and waterproof barrier, ensuring the equipment's resistance to scratches and wear from external gravel and soil. The reinforcing pipe 102 is a steel sleeve layer with an installation groove 104 inside. Reinforcing ribs 103, fixedly connected inside the installation groove 104, improve the overall strength of the equipment. Simultaneously, the high strength of the steel itself provides protection for the equipment under complex pre-embedded conditions. The thermostatic pipe 105 is a rigid polyurethane foam layer, providing efficient insulation and radial support internally. The inner pipe 106 is a wear-resistant alloy steel pipe layer, serving as the innermost layer in direct contact with the conveyed material, undertaking the core responsibilities of media conveying and internal wear resistance. The inner wall can be treated with wear-resistant coatings such as ceramic spraying. When using the stabilizing mechanism 3 to fix the reinforced insulation pipe body 1, the insulation pipe body 1 is placed inside the fixing ring 301. The base 302 fixedly connected to the bottom of the fixing ring 301 supports the equipment. At the same time, the equipment can be fixedly installed on the flat plate surface through the threaded hole 303 opened inside the base 302 for easy pre-embedding. The fixing ring 301 and the insulation pipe body 1 are further fixed by rotating the fixing bolt 304.

Claims

1. A wear-resistant prefabricated direct-buried insulated pipe, characterized in that, It includes: Insulation pipe body (1), the insulation pipe body (1) includes: Outer protective tube (101); A reinforcing tube (102) is coaxially disposed inside the outer protective tube (101); Inner tube (106), the inner tube (106) is coaxially disposed inside the reinforcing tube (102); A thermostatic tube (105) is filled in the annular space between the reinforcing tube (102) and the inner tube (106); The inner wall of the reinforcing tube (102) is provided with an installation groove (104) extending axially along the reinforcing tube (102), and a reinforcing rib (103) is fixedly connected inside the installation groove (104).

2. The wear-resistant prefabricated direct-buried insulated pipe according to claim 1, characterized in that: The outer circumferential surface of the outer protective tube (101) of the heat insulation pipe body (1) is provided with reinforcing rings (2) at intervals.

3. The wear-resistant prefabricated direct-buried insulated pipe according to claim 1, characterized in that: The inner wall of the inner tube (106) is coated with a wear-resistant ceramic layer.

4. The wear-resistant prefabricated direct-buried insulated pipe according to claim 1, characterized in that: The thermostatic tube (105) is a rigid porous foam structure layer.

5. The wear-resistant prefabricated direct-buried insulated pipe according to claim 1, characterized in that: It also includes a stabilizing mechanism (3), which includes a retaining ring (301) that is detachably clamped to the outer circumferential surface of the outer protective tube (101).

6. The wear-resistant prefabricated direct-buried insulated pipe according to claim 5, characterized in that: The fixing ring (301) is an open ring structure with a relative flange, and the stabilizing mechanism (3) further includes a fixing bolt (304) for passing through the relative flange to tighten the fixing ring (301).

7. The wear-resistant prefabricated direct-buried insulated pipe according to claim 5, characterized in that: The stabilizing mechanism (3) also includes a base (302), which is fixedly connected to the bottom of the fixing ring (301).

8. The wear-resistant prefabricated direct-buried insulated pipe according to claim 7, characterized in that: The base (302) has a threaded hole (303) on its bottom surface.

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