Pipe joint structure and method of installing the same

Abstract

The application relates to the technical field of shipbuilding, and discloses a pipeline closing connection structure and a mounting method thereof. In the application, a first pipe section is connected with a second pipe section through a first sleeve, a first connecting pipe, a first flange, a second flange, a second connecting pipe and a second sleeve in sequence to realize closing connection, the top end of the first sleeve is sleeved on the bottom end of the first pipe section, and the bottom end of the second connecting pipe is inserted into the top end of the second sleeve, so that the height of the first connecting pipe and the second connecting pipe can be adjusted to compensate for the distance error of the first pipe section and the second pipe section in the vertical direction, then the inclination angle of the first connecting pipe and the second connecting pipe can be adjusted to coaxially arrange the first connecting pipe and the second connecting pipe, compensate for the distance error of the first pipe section and the second pipe section in the horizontal direction, and ensure that the first flange and the second flange can be connected in alignment.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a pipe closure connection structure and its installation method. Background Technology

[0002] In shipbuilding, to improve efficiency, the ship's structure is divided into multiple segmented components. Each segment contains both the main structure and auxiliary components with attached functions, such as pipelines. During the segment assembly stage, the pipelines on two segments are typically connected and joined using flanges. This method requires extremely high precision in the prefabrication and installation of components. Even minor errors in the length of the pipe segments or deviations in the perpendicularity of the flanges to the pipe segment's centerline during welding can cause misalignment of the bolt holes on the two flanges during on-site assembly. Because the two joined pipe segments are "rigid," there is no room for adjustment. Length errors in the pipe segments cannot be compensated for, and angular deviations can cause the flange faces to be non-parallel, requiring forceful correction or cutting and re-welding to eliminate these issues. This is time-consuming, labor-intensive, and results in a high rework rate, leading to significant waste of time and materials. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a pipe closure connection structure and its installation method that can compensate for errors so that pipe sections can be closed.

[0004] To address the aforementioned technical problems, this invention provides a pipe closure connection structure, comprising a first pipe segment disposed in a first segmented component and a second pipe segment disposed in a second segmented component. The first and second pipe segments are respectively arranged vertically, with the bottom end of the first pipe segment higher than the top end of the second pipe segment. The axis of the first pipe segment and the axis of the second pipe segment are spaced apart in the horizontal direction. The structure further includes: a first sleeve, a first connecting pipe, a second connecting pipe, and a second sleeve. The inner diameter of the first sleeve is larger than the outer diameter of the first pipe segment. The top end of the first sleeve is fitted and fixed to the bottom end of the first pipe segment. The first sleeve gradually extends from top to bottom... The pipe is inclined towards the second pipe segment; the first connecting pipe is coaxially arranged with the first sleeve, and the top end of the first connecting pipe is fixedly connected to the bottom end of the first sleeve, and the bottom end of the first connecting pipe is provided with a first flange; the second connecting pipe is coaxially arranged with the first connecting pipe, and the top end of the second connecting pipe is provided with a second flange, which is fixedly connected to the first flange; the second sleeve is coaxially arranged with the second pipe segment, and the bottom end of the second sleeve is fixedly connected to the top end of the second pipe segment, the inner diameter of the second sleeve is larger than the outer diameter of the second connecting pipe, and the top end of the second sleeve is fitted and fixed on the bottom end of the second connecting pipe.

[0005] As a preferred embodiment of the present invention, the top end of the first connecting pipe is inserted into the bottom end of the first sleeve, and the top end of the first connecting pipe is welded to the bottom end of the first sleeve; the top end of the second pipe segment is inserted into the bottom end of the second sleeve, and the top end of the second pipe segment is welded to the bottom end of the second sleeve.

[0006] Meanwhile, the present invention also provides an installation method for the above-mentioned pipe closure connection structure, comprising the following steps: S1: The bottom end of the first sleeve is pre-welded to the top end of the first connecting pipe, and the first sleeve and the first connecting pipe are coaxially arranged. The bottom end of the second sleeve is welded to the top end of the second pipe segment, and the second sleeve and the second pipe segment are coaxially arranged. S2: In the segmented assembly stage, the first pipe segment is fixed on the first segmented component, and the second pipe segment is fixed on the second segmented component, wherein the first pipe segment and the second pipe segment are respectively arranged vertically; S3: During the segmented closing stage, the top end of the first sleeve is placed on the bottom end of the first pipe segment, and the bottom end of the second connecting pipe is inserted into the top end of the second sleeve. At this time, the bottom surface of the first flange is higher than the top surface of the second flange. S4: Adjust the height and tilt angle of the first connecting pipe, and adjust the height and tilt angle of the second connecting pipe so that the bolt holes of the first flange and the bolt holes of the second flange are aligned one by one. S5: Weld the bottom end of the first pipe section to the top end of the first sleeve, weld the bottom end of the second connecting pipe to the top end of the second sleeve, and fix the first flange and the second flange together.

[0007] As a preferred embodiment of the present invention, in S3, the first connecting pipe is arranged vertically; in S4, the second connecting pipe is arranged vertically; in S5, the heights of the first connecting pipe and the second connecting pipe are first adjusted so that the bottom surface of the first flange is flush with the top surface of the second flange; then the tilt angles of the first connecting pipe and the second connecting pipe are adjusted so that the bolt holes of the first flange and the bolt holes of the second flange are aligned one by one.

[0008] As a preferred embodiment of the present invention, in S5, after adjusting the height of the first connecting pipe and the height of the second connecting pipe, the length of the first pipe segment extending into the first sleeve is... The length by which the second connecting pipe extends into the second sleeve is The line connecting the center of the bottom surface of the first pipe section and the center of the top surface of the second sleeve is the first line segment, and the angle between the first line segment and the vertical plane is . The difference between the inner diameter of the first sleeve and the outer diameter of the first pipe section is The difference between the inner diameter of the second sleeve and the outer diameter of the second connecting pipe is ,in, .

[0009] As a preferred embodiment of the present invention, the inner diameter of the first sleeve is 2mm-3mm larger than the outer diameter of the first pipe section, and the inner diameter of the second sleeve is 2mm-3mm larger than the outer diameter of the second connecting pipe.

[0010] In a preferred embodiment of the present invention, in S3, after the top end of the first sleeve is fitted onto the bottom end of the first pipe segment, the first connecting pipe is temporarily fixed by a first connecting bracket. The first connecting bracket is fixedly arranged relative to the first segment component, and the first connecting pipe can move relative to the first connecting bracket to adjust the height and tilt angle of the first connecting pipe. After the bottom end of the second connecting pipe is inserted into the top end of the second sleeve, the second connecting pipe is temporarily fixed by a second connecting bracket. The second connecting bracket is fixedly arranged relative to the second segment component, and the second connecting pipe can move relative to the second connecting bracket to adjust the height and tilt angle of the second connecting pipe. After S5, the first connecting bracket and the second connecting bracket are removed.

[0011] As a preferred embodiment of the present invention, both the first connecting bracket and the second connecting bracket include a fixing frame and a tube clamp, wherein the tube clamp is a U-shaped stud and the tube clamp is threaded to the side of the fixing frame.

[0012] This invention discloses a pipe closure connection structure and its installation method. Compared with the prior art, its advantages are as follows: A first pipe segment is connected to a second pipe segment sequentially via a first sleeve, a first connecting pipe, a first flange, a second flange, a second connecting pipe, and a second sleeve. The top end of the first sleeve is fitted onto the bottom end of the first pipe segment, and the bottom end of the second connecting pipe is inserted into the top end of the second sleeve. By adjusting the height of the first and second connecting pipes, the vertical distance error between the first and second pipe segments can be compensated. Furthermore, by adjusting the inclination angle of the first and second connecting pipes, the first and second connecting pipes can be coaxially arranged, thereby compensating for the horizontal distance error between the first and second pipe segments and ensuring that the first and second flanges can be aligned and connected. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a pipe closure connection structure according to the present invention; Figure 2 This is a schematic diagram of the structure of the present invention after adjusting the height of the first connecting pipe and the second connecting pipe; In the diagram, the first pipe segment is 1; the second pipe segment is 2; the first sleeve is 3; the first connecting pipe is 4; the second connecting pipe is 5; the second sleeve is 6; the first connecting bracket is 7; the second connecting bracket is 8; and the first line segment is 9. Detailed Implementation

[0014] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0015] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used to indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to 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. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] like Figure 1 As shown, a preferred embodiment of the pipe closure connection structure of the present invention includes a first pipe segment 1 disposed in a first segmenting member and a second pipe segment 2 disposed in a second segmenting member. The first pipe segment 1 and the second pipe segment 2 are respectively arranged vertically, with the bottom end of the first pipe segment 1 higher than the top end of the second pipe segment 2. There is a horizontal distance between the axis of the first pipe segment 1 and the axis of the second pipe segment 2. The structure also includes: a first sleeve 3, a first connecting pipe 4, a second connecting pipe 5, and a second sleeve 6. The inner diameter of the first sleeve 3 is larger than the outer diameter of the first pipe segment 1. The top end of the first sleeve 3 is fitted and fixed to the bottom end of the first pipe segment 1. The first sleeve 3 gradually tilts from top to bottom towards the second pipe segment 2. It should be noted that in actual installation, the horizontal deviation between the axis of the first pipe segment 1 and the axis of the second pipe segment 2 will not be large, generally ±1°. Therefore, in actual cases, the tilt angle of the first sleeve 3 is relatively small. Figure 1This is only to show its tilted state and does not represent its tilt angle as shown in the figure; the first connecting pipe 4 is coaxially arranged with the first sleeve 3, and the top end of the first connecting pipe 4 is fixedly connected to the bottom end of the first sleeve 3. The bottom end of the first connecting pipe 4 is provided with a first flange; the second connecting pipe 5 is coaxially arranged with the first connecting pipe 4, and the top end of the second connecting pipe 5 is provided with a second flange. The second flange is fixedly connected to the first flange. Specifically, the screw holes of the first flange and the screw holes of the second flange are aligned one by one. The first flange and the second flange are fixedly connected by bolts and nuts; the second sleeve 6 is coaxially arranged with the second pipe section 2, and the bottom end of the second sleeve 6 is fixedly connected to the top end of the second pipe section 2. The inner diameter of the second sleeve 6 is larger than the outer diameter of the second connecting pipe 5, and the top end of the second sleeve 6 is sleeved and fixed on the bottom end of the second connecting pipe 5.

[0017] In this connection structure, the first pipe segment 1 is connected to the second pipe segment 2 in sequence through the first sleeve 3, the first connecting pipe 4, the first flange, the second flange, the second connecting pipe 5, and the second sleeve 6. The top end of the first sleeve 3 is fitted onto the bottom end of the first pipe segment 1, and the bottom end of the second connecting pipe 5 is inserted into the top end of the second sleeve 6, which serves to compensate for the vertical distance error between the first pipe segment 1 and the second pipe segment 2. Furthermore, the first connecting pipe 4 is inclined, and the second connecting pipe 5 is coaxially arranged with the first connecting pipe 4, which serves to compensate for the horizontal distance error between the first pipe segment 1 and the second pipe segment 2, ensuring that the first flange and the second flange can be aligned and connected.

[0018] For example, the top end of the first connecting pipe 4 is inserted into the bottom end of the first sleeve 3, and the top end of the first connecting pipe 4 is welded to the bottom end of the first sleeve 3 to achieve a fixed connection between the first connecting pipe 4 and the first sleeve 3. Generally, the outer diameter of the first connecting pipe 4 is the same as the inner diameter of the first sleeve 3 so as to achieve coaxial arrangement between the two. The top end of the second pipe segment 2 is inserted into the bottom end of the second sleeve 6, and the top end of the second pipe segment 2 is welded to the bottom end of the second sleeve 6 to achieve a fixed connection between the second pipe segment 2 and the second sleeve 6. Generally, the outer diameter of the second pipe segment 2 is the same as the inner diameter of the second sleeve 6 so as to achieve coaxial arrangement between the two.

[0019] For example, the bottom end of the first pipe section 1 extends into the top end of the first sleeve 3 by a length of not less than 60 mm, and the bottom end of the second connecting pipe 5 extends into the top end of the second sleeve 6 by a length of not less than 60 mm, to ensure the stability of the connection.

[0020] Meanwhile, the present invention also provides an installation method for the above-mentioned pipe closure connection structure, comprising the following steps: S1: The bottom end of the first sleeve 3 is pre-welded to the top end of the first connecting pipe 4, and the first sleeve 3 and the first connecting pipe 4 are coaxially arranged. The bottom end of the second sleeve 6 is welded to the top end of the second pipe section 2, and the second sleeve 6 and the second pipe section 2 are coaxially arranged. S2: In the segmented assembly stage, the first pipe segment 1 is fixed on the first segmented component, and the second pipe segment 2 is fixed on the second segmented component, wherein the first pipe segment 1 and the second pipe segment 2 are respectively arranged vertically; S3: During the segmented closing stage, the top end of the first sleeve 3 is fitted onto the bottom end of the first pipe segment 1. The inner diameter of the first sleeve 3 is larger than the outer diameter of the first pipe segment 1, so that the first sleeve 3 can be tilted relative to the first pipe segment 1. The bottom end of the second connecting pipe 5 is inserted into the top end of the second sleeve 6. The inner diameter of the second sleeve 6 is larger than the outer diameter of the second connecting pipe 5, so that the second connecting pipe 5 can be tilted relative to the second sleeve 6. At this time, the bottom surface of the first flange is higher than the top surface of the second flange. S4: Adjust the height and tilt angle of the first connecting pipe 4 and the height and tilt angle of the second connecting pipe 5 so that the bolt holes of the first flange and the bolt holes of the second flange are aligned one by one. S5: Weld the bottom end of the first pipe section 1 to the top end of the first sleeve 3, weld the bottom end of the second connecting pipe 5 to the top end of the second sleeve 6, and fix the first flange and the second flange together to complete the closure connection of the first pipe section 1 and the second pipe section 2. Figure 1 As shown.

[0021] This method first involves fitting the first sleeve 3 onto the first pipe section 1, and then inserting the second connecting pipe 5 into the second sleeve 6. Since the inner diameter of the first sleeve 3 is larger than the outer diameter of the first pipe section 1, and the inner diameter of the second sleeve 6 is larger than the outer diameter of the second pipe section 2, the first sleeve 3 and the first connecting pipe 4 can move relative to the first pipe section 1 to adjust the height and tilt angle of the first sleeve 3, and the second connecting pipe 5 can move relative to the second sleeve 6 to adjust the height and tilt angle of the second connecting pipe 5. By adjusting the height and tilt angle of the first connecting pipe 4 and the second connecting pipe 5, the vertical and horizontal errors of the first pipe section 1 and the second pipe section 2 are compensated, ensuring that the bolt holes of the first flange and the second flange are aligned one by one, thus ensuring that the first flange and the second flange can be connected normally, thereby achieving the closing connection of the first pipe section 1 and the second pipe section 2. During the closing assembly stage, there is no need for difficult overhead welding, making the operation simple.

[0022] For example, in S3, the first connecting pipe 4 is arranged vertically, that is, the first sleeve is arranged vertically, so that the top end of the first sleeve fits onto the bottom end of the first pipe section 1 and facilitates the insertion of the bottom end of the second connecting pipe 5 into the top end of the second sleeve 6. In S4, the heights of the first connecting pipe 4 and the second connecting pipe 5 are adjusted respectively so that the bottom surface of the first flange is flush with the top surface of the second flange. Figure 2As shown, it can be understood that before adjusting the height, the distance between the bottom surface of the first flange and the top surface of the second flange is less than the sum of the length of the first pipe section 1 extending into the first sleeve 3 and the length of the second connecting pipe 5 extending into the second sleeve 6, so as to ensure that the bottom surface of the first flange and the top surface of the second flange can be adjusted to be flush. At this time, the first flange and the second flange are misaligned. Then, the tilt angles of the first connecting pipe 4 and the second connecting pipe 5 are adjusted respectively so that the bolt holes of the first flange and the bolt holes of the second flange are aligned one by one. The height is adjusted first, and then the tilt angle is adjusted for installation.

[0023] For example, in S5, after adjusting the height of the first connecting pipe 4 and the height of the second connecting pipe 5, the length of the first pipe segment 1 extending into the first sleeve 3 is L1, the length of the second connecting pipe 5 extending into the second sleeve 6 is L2, the line connecting the center of the bottom surface of the first pipe segment 1 and the center of the top surface of the second sleeve 6 is the first line segment 9, the angle between the first line segment 9 and the vertical plane is θ, the difference between the inner diameter of the first sleeve 3 and the outer diameter of the first pipe segment 1 is S1, and the difference between the inner diameter of the second sleeve 6 and the outer diameter of the second connecting pipe 5 is S2. That is, the maximum angle that the first connecting pipe 4 can tilt and the maximum angle that the second connecting pipe 5 can tilt are both greater than θ, ensuring that the axis of the first connecting pipe 4 and the axis of the second connecting pipe 5 can be adjusted to be coaxial with the first line segment 9, that is, ensuring that the bolt holes of the first flange and the bolt holes of the second flange are aligned one by one.

[0024] For example, the inner diameter of the first sleeve 3 is 2mm-3mm larger than the outer diameter of the first pipe section 1, and the inner diameter of the second sleeve 6 is 2mm-3mm larger than the outer diameter of the second connecting pipe 5, to prevent the gap from being too large and causing the welding to be weak, thus affecting the stability of the connection.

[0025] For example, in S3, after the top end of the first sleeve 3 is fitted onto the bottom end of the first pipe segment 1, the first connecting pipe 4 is temporarily fixed by the first connecting bracket. The first connecting bracket is fixed relative to the first segment component. The first connecting pipe 4 can move relative to the first connecting bracket 7 to adjust the height and tilt angle of the first connecting pipe 4. After the bottom end of the second connecting pipe 5 is inserted into the top end of the second sleeve 6, the second connecting pipe 5 is temporarily fixed by the second connecting bracket. The second connecting bracket is fixed relative to the second segment component. The second connecting pipe 5 can move relative to the second connecting bracket to adjust the height and tilt angle of the second connecting pipe 5. The temporary fixing of the first connecting pipe 4 by the first connecting bracket and the temporary fixing of the second connecting pipe 5 by the second connecting bracket facilitates the adjustment of the positions of the first connecting pipe 4 and the second connecting pipe 5, and also facilitates the welding of the first connecting pipe 4 to the first pipe segment 1 and the welding of the second connecting pipe 5 to the second sleeve 6. After S5, the first connecting bracket and the second connecting bracket are removed.

[0026] For example, both the first connecting bracket 7 and the second connecting bracket 8 include a fixing frame and a tube clamp. The tube clamp is a U-shaped stud and is threaded to the side of the fixing frame. In S3, the fixing frame of the first connecting bracket 7 is fixedly connected to the first segment component. The tube clamp of the first connecting bracket 7 is sleeved on the first connecting pipe 4 and threaded to the fixing frame, thereby clamping the first connecting pipe 4 and temporarily fixing the first connecting pipe 4. After the tube clamp is released, the first connecting pipe 4 can move vertically to adjust its height and can rotate to adjust its tilt angle. After adjustment, the tube clamp can be tightened again. Generally, the tube clamp is set horizontally, and the cross-section of the U-shaped stud is circular. Therefore, the tube clamp and the first connecting pipe 4 are in line contact. So when the tube clamp is tightened, the tube clamp will not drive the first connecting pipe 4 to rotate, that is, it will not affect the first connecting pipe 4 from maintaining the predetermined (adjusted) tilt angle. The principle of the second connecting bracket 8 temporarily fixing the second connecting pipe 5 is the same as the principle of the first connecting bracket 7 temporarily fixing the first connecting pipe 4.

[0027] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A pipe closure connection structure, comprising a first pipe segment disposed in a first segmented component and a second pipe segment disposed in a second segmented component, wherein the first pipe segment and the second pipe segment are respectively disposed vertically, the bottom end of the first pipe segment is higher than the top end of the second pipe segment, and there is a horizontal distance between the axis of the first pipe segment and the axis of the second pipe segment, characterized in that: Also includes: The first sleeve has an inner diameter larger than the outer diameter of the first pipe segment. The top end of the first sleeve is fitted and fixed on the bottom end of the first pipe segment. The first sleeve gradually tilts from top to bottom towards the second pipe segment. The first connecting pipe is coaxially arranged with the first sleeve, and the top end of the first connecting pipe is fixedly connected to the bottom end of the first sleeve. The bottom end of the first connecting pipe is provided with a first flange. The second connecting pipe is coaxially arranged with the first connecting pipe, and the top end of the second connecting pipe is provided with a second flange, which is fixedly connected to the first flange. And a second sleeve, which is coaxially arranged with the second pipe segment, the bottom end of the second sleeve is fixedly connected to the top end of the second pipe segment, the inner diameter of the second sleeve is larger than the outer diameter of the second connecting pipe, and the top end of the second sleeve is sleeved and fixed on the bottom end of the second connecting pipe. The top end of the first connecting pipe is inserted into the bottom end of the first sleeve, and the top end of the first connecting pipe is welded to the bottom end of the first sleeve. The top end of the second pipe segment is inserted into the bottom end of the second sleeve, and the top end of the second pipe segment is welded to the bottom end of the second sleeve. The length of the bottom end of the first pipe segment extending into the top end of the first sleeve is not less than 60 mm, and the length of the bottom end of the second connecting pipe extending into the top end of the second sleeve is not less than 60 mm.

2. An installation method for the pipe closure connection structure as described in claim 1, characterized in that: Includes the following steps: S1: The bottom end of the first sleeve is pre-welded to the top end of the first connecting pipe, and the first sleeve and the first connecting pipe are coaxially arranged. The bottom end of the second sleeve is welded to the top end of the second pipe segment, and the second sleeve and the second pipe segment are coaxially arranged. S2: In the segmented assembly stage, the first pipe segment is fixed on the first segmented component, and the second pipe segment is fixed on the second segmented component, wherein the first pipe segment and the second pipe segment are respectively arranged vertically; S3: During the segmented closing stage, the top end of the first sleeve is placed on the bottom end of the first pipe segment, and the bottom end of the second connecting pipe is inserted into the top end of the second sleeve. At this time, the bottom surface of the first flange is higher than the top surface of the second flange. S4: Adjust the height and tilt angle of the first connecting pipe, and adjust the height and tilt angle of the second connecting pipe so that the bolt holes of the first flange and the bolt holes of the second flange are aligned one by one. S5: Weld the bottom end of the first pipe section to the top end of the first sleeve, weld the bottom end of the second connecting pipe to the top end of the second sleeve, and fix the first flange and the second flange together.

3. The installation method of the pipe closure connection structure according to claim 2, characterized in that: In S3, the first connecting pipe is arranged vertically and the second connecting pipe is arranged vertically. In S4, the heights of the first connecting pipe and the second connecting pipe are first adjusted so that the bottom surface of the first flange is flush with the top surface of the second flange. Then, the tilt angles of the first connecting pipe and the second connecting pipe are adjusted so that the bolt holes of the first flange and the bolt holes of the second flange are aligned one by one.

4. The installation method of the pipe closure connection structure according to claim 3, characterized in that: In S5, after adjusting the heights of the first connecting pipe and the second connecting pipe, the length of the first pipe segment extending into the first sleeve is... The length by which the second connecting pipe extends into the second sleeve is The line connecting the center of the bottom surface of the first pipe section and the center of the top surface of the second sleeve is the first line segment, and the angle between the first line segment and the vertical plane is . The difference between the inner diameter of the first sleeve and the outer diameter of the first pipe section is The difference between the inner diameter of the second sleeve and the outer diameter of the second connecting pipe is ,in, .

5. The installation method of the pipe closure connection structure according to claim 4, characterized in that: The inner diameter of the first sleeve is 2mm-3mm larger than the outer diameter of the first pipe section, and the inner diameter of the second sleeve is 2mm-3mm larger than the outer diameter of the second connecting pipe.

6. The installation method of the pipe closure connection structure according to claim 2, characterized in that: In S3, after the top end of the first sleeve is fitted onto the bottom end of the first pipe segment, the first connecting pipe is temporarily fixed by the first connecting bracket. The first connecting bracket is fixedly set relative to the first segment component, and the first connecting pipe can move relative to the first connecting bracket to adjust the height and tilt angle of the first connecting pipe. After the bottom end of the second connecting pipe is inserted into the top end of the second sleeve, the second connecting pipe is temporarily fixed by the second connecting bracket. The second connecting bracket is fixedly set relative to the second segment component, and the second connecting pipe can move relative to the second connecting bracket to adjust the height and tilt angle of the second connecting pipe. After S5, the first connecting bracket and the second connecting bracket are removed.

7. The installation method of the pipe closure connection structure according to claim 6, characterized in that: Both the first connecting bracket and the second connecting bracket include a fixing frame and a tube clamp. The tube clamp is a U-shaped stud and is threaded to the side of the fixing frame.

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