Steam heat preservation pipeline and construction method

Abstract

The invention relates to the technical field of steam pipeline construction, in particular to a steam heat preservation pipeline and a construction method.The steam heat preservation pipeline comprises a pipeline body, connecting pipes are rotationally installed at the two ends of the pipeline body, slope grooves are formed in the connecting ends of the connecting pipes, sliding grooves are formed in the surfaces of the connecting pipes, and sliding blocks are slidably connected to the inner walls of the sliding grooves; a connecting sleeve is fixedly connected to the surface of the sliding block, a gap exists between the connecting sleeve and the connecting pipe, a glue injection hole is formed in the surface of the connecting sleeve, a T-shaped sliding groove is formed in the end face of the connecting sleeve, and a T-shaped positioning strip is installed on the inner wall of the T-shaped sliding groove in a sliding mode. The connecting pipes are rotationally installed at the two ends of the pipeline body, and a connecting sleeve and sliding block and sliding groove linkage structure is arranged, so that the connecting pipes can be flexibly rotated in the welding process, a welding seam which is originally located at the bottom and limited in operation space is transferred to the top, and constructors do not need to bend over or enter the bottom of a narrow tunnel for operation for a long time; and the labor intensity and the safety risk are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of steam pipeline construction technology, and in particular to a steam insulation pipeline and its construction method. Background Technology

[0002] Steam pipelines are a key component of industrial and civil heat transmission systems, widely used in power, chemical, pharmaceutical, and food processing industries, as well as in urban centralized heating and district heating systems. Their typical structure is a multi-layered composite design. The inner layer is the working pipe that withstands high-temperature, high-pressure steam, usually made of carbon steel or stainless steel; the middle layer is insulation material, such as rock wool, glass wool, or polyurethane foam, to reduce heat loss; the outer layer is a protective pipe, typically made of polyethylene, galvanized steel sheet, or aluminum cladding, providing moisture protection, corrosion resistance, and mechanical protection. This structure ensures the thermal efficiency, safety, and durability of steam during long-distance transmission. With the continuous upgrading of urban infrastructure, steam pipelines often need to be laid in underground pipe corridors, directly buried in soil, or on overhead supports, placing higher demands on the pipeline's sealing performance, structural strength, and construction quality.

[0003] In the construction of steam pipelines, welding is the core process for connecting adjacent pipe sections, and its quality directly affects the overall sealing, pressure-bearing capacity, and service life of the pipeline. Traditional construction methods typically involve fixing the main pipe body in place and then performing circumferential welding at the joints, including multiple steps such as root pass welding, fill pass welding, and cover pass welding. Welders need to perform welding around the pipeline in all positions, especially when operating at the bottom of the pipeline (overhead welding position), where the work space is extremely limited due to the weld seam being located low and close to the bottom of the tunnel. In the construction of directly buried pipelines, welders often need to enter the bottom of the tunnel more than one meter deep, working in a bent-over or squatting position, which is not only inconvenient and labor-intensive, but also poses health hazards due to the difficulty in dispersing welding fumes. Furthermore, obstructed visibility and limited welding torch angles easily lead to defects such as uneven weld formation, incomplete fusion, and slag inclusions.

[0004] Current welding processes reveal numerous problems in practical applications: First, the welding quality of the bottom weld is difficult to guarantee. Due to unstable operating postures and poor visibility, the defect rate is high, often requiring rework through non-destructive testing, which increases construction time and costs. Second, construction safety is poor; operations inside tunnels may face risks such as collapses, water accumulation, and oxygen deficiency, placing significant pressure on accident prevention. Third, welding efficiency is low, with each weld taking a long time, especially in urban centers or complex underground environments where the construction window is short, making it difficult for traditional welding methods to meet schedule requirements. These problems not only affect the economics of the project but also restrict the reliable operation of the steam pipeline system.

[0005] To address the aforementioned problems, this invention provides an innovative steam insulation pipeline and its construction method. By rotatably installing connecting pipes at both ends of the pipeline body and incorporating a linkage structure of connecting sleeves, sliders, and grooves, flexible rotation of the connecting pipes during welding is achieved, allowing the weld seam, originally located at the bottom, to be moved to the top operating position. Construction personnel no longer need to enter the bottom of the tunnel or work in a bent-over position for extended periods, significantly reducing labor intensity and safety hazards. Simultaneously, the design of V-shaped welding grooves, inclined welding grooves, and T-shaped positioning strip slots ensures accurate welding alignment and synchronous rotation, improving weld quality and first-pass yield. After welding, insulation material can be injected through the injection hole to enhance the sealing and insulation effect of the joint. This solution effectively overcomes the limitations of traditional welding, is suitable for various complex working conditions such as underground pre-buried and overhead laying, and has high engineering application value. Summary of the Invention

[0006] To achieve the above objectives, the present invention proposes a steam insulation pipe, comprising a pipe body, with connecting pipes rotatably installed at both ends of the pipe body, the connecting end of the connecting pipe having an inclined groove, the surface of the connecting pipe having a sliding groove, the inner wall of the sliding groove having a slider slidably connected, the surface of the slider having a connecting sleeve fixedly connected, a gap existing between the connecting sleeve and the connecting pipe, and the surface of the connecting sleeve having an injection hole. The end face of the connecting sleeve is provided with a T-shaped groove, and a T-shaped positioning strip is slidably installed on the inner wall of the T-shaped groove. A second spring is fixedly connected to the opposite side of the T-shaped positioning strip and the T-shaped groove. The side of the connecting sleeve is provided with a slot that matches the T-shaped positioning strip, and the end face of the connecting sleeve is provided with a beveled welding groove.

[0007] In one example, a rotating ring is fixedly connected to the surface of the connecting pipe, and a first limiting ring and a second limiting ring are fixedly installed on the inner walls of both ends of the pipe body.

[0008] In one example, the rotating ring is located between the first limiting ring and the second limiting ring, with both sides of the rotating ring overlapping the sides of the first limiting ring and the second limiting ring respectively, and the inner ring surface of the first limiting ring having a welding groove.

[0009] In one example, the surface of the rotating ring is provided with a T-shaped groove, the inner wall of the T-shaped groove is slidably connected with a T-shaped positioning block, and the opposite surface of the T-shaped positioning block and the T-shaped groove is fixedly connected with a first spring.

[0010] In one example, the inner wall of the pipe body is provided with a positioning groove, the surface of the T-shaped positioning block overlaps with the inner wall of the positioning groove, and both the front and back of the T-shaped positioning block are arc-shaped.

[0011] In one example, the position of the T-shaped positioning bar on the left corresponds to the position of the slot on the right.

[0012] In one example, the T-shaped positioning strip extends out of the connecting tube, and the length of the T-shaped positioning strip beyond the connecting tube is the same as the length of the slot.

[0013] In one example, a construction method for a steam-insulated pipe includes the following steps: Step 1: Align the two pipe bodies and bring them close together so that the welding ends of the connecting pipe overlap. Insert the T-shaped positioning strip into the slot to complete the connection between the connecting sleeves. Step 2: Weld at the V-shaped welding groove formed by the two connecting pipes. After welding the upper area, rotate the connecting pipe. With the connection of the connecting sleeve, the two connecting pipes rotate synchronously to adjust the welding position and move the lower welding area to the upper area for welding. Step 3: Approach the two connecting sleeves and weld them together. Similar to Step 2, after welding the upper area, rotate the connecting sleeves to adjust the direction and weld the lower area. Step 4: Rotate the connecting sleeve to move the glue injection hole to a convenient position for glue injection. Inject insulation material between the connecting sleeve and the connecting pipe through the glue injection hole to ensure the connection between the connecting sleeve and the connecting pipe and to insulate the welded joint. Step 5: Weld the first limiting ring to the connecting pipe through the weld groove. Since the welding position can be tilted at this time.

[0014] The steam insulation pipe and construction method proposed in this invention can bring the following beneficial effects: 1. This invention rotatably installs the connecting pipe at both ends of the pipeline body and sets up a linkage structure between the connecting sleeve and the sliding block groove, allowing the connecting pipe to rotate flexibly during the welding process. This moves the weld, which was originally located at the bottom and had limited operating space, to the top. Construction personnel no longer need to bend over for long periods or enter the bottom of narrow tunnels to work, significantly reducing labor intensity and safety risks. At the same time, the V-shaped welding groove and the inclined welding groove design increase the penetration depth and width. Combined with the rotation positioning function, it can realize segmented, layered, and multi-angle welding, avoiding defects such as incomplete fusion and slag inclusions caused by single-sided welding in traditional fixed pipelines. The weld formation is uniform, the defect rate is reduced, and the welding quality and first-pass yield are significantly improved. It is especially suitable for complex working conditions such as underground pre-buried and overhead laying, reducing rework and maintenance costs and improving overall construction efficiency and project reliability.

[0015] 2. This invention utilizes the precise fit between the T-shaped positioning strip and the slot to achieve dual axial and circumferential positioning between adjacent connecting sleeves, ensuring that the two pipe sections remain coaxial and do not move relative to each other before welding; the slider is embedded in the groove, and the connecting sleeve and the connecting pipe form a circumferential rigid linkage, ensuring smooth torque transmission during welding and eliminating misalignment and skewness; after welding, insulation material is injected into the gap between the connecting sleeve and the connecting pipe through the injection hole, which forms an elastic sealing ring after curing, absorbing thermal expansion and contraction deformation and preventing weld cracking and media leakage caused by temperature cycling; the synergistic effect of multiple limiting and elastic sealing ensures that the node maintains high sealing performance and structural integrity when subjected to internal steam pressure, external soil load, and seismic forces. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a three-dimensional structural diagram of a steam insulation pipe; Figure 2 For a type of steam insulation pipe Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 A schematic diagram of the internal structure of a steam insulation pipe; Figure 4 For a type of steam insulation pipe Figure 3 Enlarged structural diagram at point B.

[0017] The attached figures are labeled as follows: 1. Pipe body, 2. Connecting pipe, 3. Inclined groove, 4. Rotating ring, 5. First limiting ring, 6. Second limiting ring, 7. T-shaped positioning block, 8. First spring, 9. Weld groove, 10. Connecting sleeve, 11. T-shaped positioning strip, 12. Second spring, 13. Slot. Detailed Implementation

[0018] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0019] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] like Figures 1 to 4 As shown, the present invention proposes a steam insulation pipeline and construction method, including a pipeline body 1, which is an existing pipeline structure, including a working pipe, an insulation layer and an outer protective pipe. The working pipe is located inside the pipeline body 1, the insulation layer wraps around the working pipe for insulation, and the outer protective pipe is located on the outermost layer of the pipeline body 1 to protect the working pipe and the insulation layer.

[0024] Meanwhile, both ends of the main pipe 1 are equipped with connecting pipes 2 for pipe connection. The connecting end of the connecting pipe 2 has a beveled groove 3. When the two main pipes 1 are welded, the connecting ends of the two connecting pipes 2 are aligned. At this time, the two beveled grooves 3 form a V-shaped welding groove, which facilitates welding. After the connecting pipes 2 on both sides are connected, since the main pipe 1 is placed in the pre-dug pre-buried pit, the bottom area of ​​the connecting pipe 2 is close to the bottom of the pit. When welding, the workers need to weld from below, which is inconvenient.

[0025] To facilitate welding at the bottom of the connecting pipe 2, the connecting pipe 2 is rotatably installed inside the pipe body 1. A rotating ring 4 is fixedly connected to the surface of the connecting pipe 2. A first limiting ring 5 and a second limiting ring 6 are fixedly installed on the inner walls of both ends of the pipe body 1. The rotating ring 4 is located between the first limiting ring 5 and the second limiting ring 6, and the two sides of the rotating ring 4 overlap with the sides of the first limiting ring 5 and the second limiting ring 6, respectively. The first limiting ring 5 and the second limiting ring 6 limit the rotating ring 4, ensuring its rotation and preventing it from moving inside the pipe body 1. Since the rotating ring 4 can rotate, it can drive the connecting pipe 2 to rotate. During the welding process, the welding part located at the bottom can be moved to the top by rotating the connecting pipe 2, thus facilitating welding.

[0026] To ensure the stability of the connecting pipe 2 during the initial welding process due to its rotation, a T-shaped groove extending through the surface of the rotating ring 4 is provided inside the rotating ring 4. A first positioning component is installed inside the T-shaped groove. This first positioning component includes a T-shaped positioning block 7 that slides on the inner wall of the T-shaped groove. A first spring 8 is installed on the opposite side of the T-shaped positioning block 7 and the T-shaped groove. The first spring 8 can press the T-shaped positioning block 7 against the inner top wall of the T-shaped groove. A positioning groove is also provided on the inner wall of the pipe body 1 to accommodate the T-shaped positioning block 7. The front and back of the T-shaped positioning block 7 are both arc-shaped. When the connecting pipe 2 rotates, the arc surface of the T-shaped positioning block 7 contacts the inner wall of the positioning groove, causing the T-shaped positioning block 7 to be compressed. The first spring 8 compresses, and the T-shaped positioning block 7 moves towards the T-shaped groove. After moving to another positioning groove, the first spring 8 pushes the T-shaped positioning block 7 into the positioning groove. At this time, the connecting pipe 2 adjusts its position, thereby adjusting the welding position and facilitating welding.

[0027] Since there is no fixation between the connecting pipe 2 and the pipe body 1, a welding groove 9 is provided on the inner ring surface of the first limiting ring 5. After the connecting pipe 2 is welded, the connecting pipe 2 is welded to the pipe body 1 to achieve the connection between the pipe bodies 1.

[0028] After the initial welding between the connecting pipes 2, considering that the connecting pipes 2 will need to be rotated and the welding position adjusted later, it is necessary to ensure that the two connecting pipes 2 rotate synchronously. A connecting sleeve 10 is slidably installed on the surface of the connecting pipe 2. A T-shaped groove is opened on the end face of the connecting sleeve 10. A T-shaped positioning strip 11 is slidably installed on the inner wall of the T-shaped groove. A second spring 12 is fixedly connected to the opposite side of the T-shaped positioning strip 11 and the T-shaped groove. A slot 13 adapted to the T-shaped positioning strip 11 is opened on the side of the connecting sleeve 10. The position of the left T-shaped positioning strip 11 corresponds to the position of the right slot 13. Similarly, the position of the T-shaped positioning strip 11 on the right corresponds to the position of the slot 13 on the left, ensuring that the T-shaped positioning strip 11 is inserted into the slot 13. When welding the connecting tube 2, first move the connecting sleeve 10 to insert the T-shaped positioning strip 11 into the slot 13. When the connecting tube 2 rotates, the connecting sleeve 10 rotates accordingly. The T-shaped positioning strip 11 is inserted into the slot 13, which can ensure that the two connecting sleeves 10 rotate synchronously. A slider is installed on the inner wall of the connecting sleeve 10, and a groove is opened on the surface of the connecting tube 2. The slider is located in the groove. At this time, the slider can drive the two connecting tubes 2 to rotate synchronously.

[0029] The T-shaped positioning strip 11 extends out of the connecting tube 2. The length of the T-shaped positioning strip 11 beyond the connecting tube 2 is the same as the length of the slot 13. During actual construction, when the two connecting tubes 2 are aligned, the T-shaped positioning strip 11 is just fully inserted into the slot 13, and both connecting sleeves 10 are located at the starting end and do not move.

[0030] After the connecting pipe 2 is welded, it is welded close to the two connecting sleeves 10. The end face of the connecting sleeve 10 is provided with a beveled weld groove 9 to facilitate welding. There is a gap between the connecting sleeve 10 and the connecting pipe 2. An injection hole is provided on the surface of the connecting sleeve 10. Insulation material is injected through the injection hole to insulate the welded joint of the connecting pipe 2 and ensure the insulation of the welded joint.

[0031] The construction method for the above-mentioned insulated pipes includes the following steps: Step 1: Align the two pipe bodies 1 and bring them close together so that the welding ends of the connecting pipe 2 overlap. Insert the T-shaped positioning strip 11 into the slot 13 to complete the connection between the connecting sleeves 10. Step 2: Weld at the V-shaped welding groove formed by the two connecting pipes 2. After welding the upper area, rotate the connecting pipe 2. Under the connection of the connecting sleeve 10, the two connecting pipes 2 rotate synchronously to adjust the welding position and move the lower welding area to the upper area for welding. Step 3: Approach the two connecting sleeves 10 and weld the connecting sleeves 10. Similar to Step 2, after welding the upper area, rotate the connecting sleeves 10 to adjust the direction and weld the lower welding area. Step 4: Rotate the connecting sleeve 10 to move the glue injection hole to a convenient position for glue injection. Inject insulation material between the connecting sleeve 10 and the connecting pipe 2 through the glue injection hole to ensure the connection between the connecting sleeve 10 and the connecting pipe 2 and to perform heat insulation treatment on the welded joint. Step 5: Weld the first limiting ring 5 to the connecting pipe 2 through the welding groove 9. Since the welding position at this time can be tilted, the welding can be carried out.

[0032] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0033] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A steam-insulated pipe comprising a pipe body (1), characterized in that: Both ends of the pipeline body (1) are rotatably installed with connecting pipes (2), the connecting ends of the connecting pipes (2) are provided with inclined grooves (3), the surfaces of the connecting pipes (2) are provided with sliding grooves, the inner walls of the sliding grooves are slidably connected with sliding blocks, the surfaces of the sliding blocks are fixedly connected with connecting sleeves (10), gaps exist between the connecting sleeves (10) and the connecting pipes (2), the surfaces of the connecting sleeves (10) are provided with glue injection holes; The end surface of the connecting sleeve (10) is provided with a T-shaped sliding groove, the inner wall of the T-shaped sliding groove is slidably installed with a T-shaped positioning strip (11), the opposite surface of the T-shaped positioning strip (11) and the T-shaped sliding groove is fixedly connected with a second spring (12), the side surface of the connecting sleeve (10) is provided with a slot (13) matched with the T-shaped positioning strip (11), and the end surface of the connecting sleeve (10) is provided with an inclined welding groove (9).

2. A steam-insulated pipe according to claim 1, characterized in that: The surface of the connecting pipe (2) is fixedly connected with a rotating ring (4), and the inner walls of the two ends of the pipeline body (1) are fixedly installed with first limiting rings (5) and second limiting rings (6).

3. A steam traced pipe line as defined in claim 2, wherein: The rotating ring (4) is located between the first limiting ring (5) and the second limiting ring (6), and the two sides of the rotating ring (4) are respectively overlapped with the side surfaces of the first limiting ring (5) and the second limiting ring (6), and the inner ring surface of the first limiting ring (5) is provided with a welding groove (9).

4. A steam traced pipe line as defined in claim 1, wherein: The surface of the rotating ring (4) is provided with a T-shaped groove, the inner wall of the T-shaped groove is slidably connected with a T-shaped positioning block (7), and the opposite surface of the T-shaped positioning block (7) and the T-shaped groove is fixedly connected with a first spring (8).

5. A steam traced pipe line according to claim 4, characterized in that: The inner wall of the pipeline body (1) is provided with a positioning groove, the surface of the T-shaped positioning block (7) is overlapped with the inner wall of the positioning groove, and the front surface and the back surface of the T-shaped positioning block (7) are both arc-shaped.

6. A steam traced pipe line as defined in claim 1, wherein: The position of the T-shaped positioning strip (11) on the left side corresponds to the position of the slot (13) on the right side.

7. A steam traced pipe line as defined in claim 1, wherein: The T-shaped positioning strip (11) extends out of the connecting pipe (2), and the length of the T-shaped positioning strip (11) beyond the connecting pipe (2) is the same as the length of the slot (13).

8. A method of installing a steam tracing pipe according to any one of claims 1 to 7, characterized in that: The steps include: Align two pipeline bodies (1), and make the welding ends of the connecting pipes (2) overlap; Insert the T-shaped positioning strip (11) into the slot (13) to complete the connection between the connecting sleeves (10); Weld at the V-shaped welding groove formed by the two connecting pipes (2), after welding the upper area, rotate the connecting pipe (2), and synchronously rotate the two connecting pipes (2) under the connection of the connecting sleeve (10), adjust the welding position, move the lower welding area to the upper area, and weld; Approach the two connecting sleeves (10), weld the connecting sleeves (10), and the same as step two, after welding the upper area, rotate the connecting sleeve (10) to adjust the direction for welding the lower welding area; Rotate the connecting sleeve (10) to move the glue injection hole to a position convenient for glue injection, inject the heat preservation material between the connecting sleeve (10) and the connecting pipe (2) through the glue injection hole, ensure the connection between the connecting sleeve (10) and the connecting pipe (2), and perform heat preservation treatment on the welding part; Weld the first limiting ring (5) and the connecting pipe (2) through the welding groove (9), and since the welding position at this time can be inclined welding.

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