Pipeline trenchless repair device and method

Abstract

The present invention discloses a trenchless pipeline repair device and method. The device comprises multiple circumferential arch supports, each of which includes a gasket, multiple pulleys evenly distributed on the inner wall of the gasket, and multiple support members evenly distributed on the inner wall of the gasket. The support members and pulleys are alternately distributed, and the height of the support members on the gasket is lower than the height of the pulleys on the gasket. This invention reduces welding difficulty and improves welding quality. It also reduces the support cost of the inner liner pipe and improves the quality of grouting repairs.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to a pipeline trenchless repair device and method. Background Art

[0002] During the construction of stainless steel lining for trenchless pipeline repair, it is necessary to perform back-grouting after installing the stainless steel lining segments on the pipeline, and to anchor the lining segments to the pipeline wall with the back-grouting to form a force-bearing whole. During construction, the circumferential installation of the lining segments is extremely difficult. The conventional anchoring method is to use short steel bars for welding. This method will affect the assembly of the lining segments, the force is poor, and the thickness of the back-grouting is difficult to guarantee. When assembling the lining segments, many places are overhead welded, which increases the welding difficulty. During the back-grouting, the grouting liquid will generate great pressure and buoyancy on the lining segments, causing the stainless steel segments to float as a whole and easily deform. However, other facilities such as the central duct are arranged in the pipeline, making support extremely inconvenient and difficult to form a support force for the entire pipe wall. Summary of the Invention

[0003] The purpose of the present invention is to provide a non-excavation pipeline repair device and method to solve the problems of difficulty in overhead welding when splicing liner pipes, poor welding quality, poor force support on the pipeline after splicing the liner pipes, and poor support effect during grouting between the pipeline and the liner pipe, which easily causes the liner pipe to float or deform.

[0004] In order to solve the above technical problems, the present invention provides a pipeline non-excavation repair device, comprising: a plurality of circumferential arch supports of the same specifications and smaller than the diameter of the pipeline, each of the circumferential arch supports including a gasket, a plurality of pulleys evenly distributed on the inner wall of the gasket, and a plurality of supports evenly distributed on the inner wall of the gasket, the supports and pulleys being distributed alternately, and the height at which the supports are arranged on the gasket is lower than the height at which the pulleys are arranged on the gasket.

[0005] Furthermore, in the trenchless pipe repair device provided by the present invention, the gasket is formed by connecting multiple arc-shaped connecting plates.

[0006] Furthermore, in the trenchless pipeline repair device provided by the present invention, two adjacent arc-shaped connecting plates are connected by welding or bolts.

[0007] Furthermore, in the trenchless pipeline repair device provided by the present invention, the support member is T-shaped or I-shaped.

[0008] Furthermore, in the trenchless pipe repair device provided by the present invention, a surface of the support member close to the liner pipe is an arc-shaped surface.

[0009] Furthermore, in the trenchless pipe repair device provided by the present invention, the pulley is a double roller arranged on the inner wall of the gasket and distributed along the width direction of the inner wall.

[0010] Furthermore, in the trenchless pipe repair device provided by the present invention, the number of the annular arch supports is four, and the number of the inner lining pipe is three sections.

[0011] In order to solve the above technical problems, the present invention further provides a pipeline trenchless repair method, which uses the above pipeline trenchless repair device and comprises:

[0012] Step 1: Two annular arch supports are nested and installed in parallel and spaced relation in the pipeline; multiple segments of a certain section of inner liner pipe are placed on the pulleys on the gaskets of the two annular arch supports; two adjacent segments are slid on the gaskets via the pulleys so as to rotate and splice the adjacent segments relative to the gaskets and rotate the radial splicing seams to the lower chord of the gaskets to weld the radial splicing seams; the inner liner pipe formed by welding the multiple segments is welded to the gaskets of the corresponding annular arch supports via support members;

[0013] Step 2: A new annular arch support is installed at a parallel interval on one side of the annular arch support installed in the pipeline, and multiple segments of the next section of the liner pipe are placed on the pulleys of the newly added annular arch support and the adjacent annular arch support, and the two adjacent segments are slid on the gasket through the pulley so that the two adjacent segments are rotated relative to the gasket and spliced, and the radial splicing seams are rotated to the lower chord of the gasket to weld the radial splicing seams; the section of the liner pipe formed after welding the multiple segments is rotated relative to the two annular arch supports thereon through the pulley so that the radial splicing seams of the section of the liner pipe and the previous section of the liner pipe are staggered, and the section of the liner pipe is welded to the gasket of the corresponding annular arch support through the support member, and the annular splicing seams of the adjacent sections of the liner pipe are welded;

[0014] Step 3: Repeat step 2 until the length of the liner pipe covers the repaired area of ​​the pipeline;

[0015] Step 4: Grouting is performed between the liner pipe and the pipeline in the repair area to anchor the gasket of the annular arch support to the pipeline.

[0016] Furthermore, in the trenchless pipe repair method provided by the present invention, the method of rotating and splicing two adjacent segments relative to the gasket and rotating the radial splicing seam to the lower chord surface of the gasket includes:

[0017] Place the previous section of the pipe segment on the pulleys on the gaskets of the two adjacent annular arch supports, rotate the previous section of the pipe segment relative to the gasket through the pulley so that one end is rotated to the lower chord surface of the gasket, and then place the next section of the pipe segment on the pulleys on the gaskets of the two adjacent annular arch supports so that it is spliced ​​with the previous section of the pipe segment to the lower chord surface of the gasket.

[0018] Furthermore, in the trenchless pipe repair method provided by the present invention, the method of rotating and splicing two adjacent segments relative to the gasket and rotating the radial splicing seam to the lower chord surface of the gasket includes:

[0019] Place both pipes on the pulleys on the gaskets of the two adjacent annular arch supports, slide the two adjacent pipe segments on the gaskets through the pulleys so that the two adjacent pipe segments are rotated and spliced ​​relative to the gaskets and their radial splicing seams are rotated to the lower chord surface of the gaskets.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The trenchless pipeline repair device and method provided by the present invention can rotate the radial joints between adjacent segments of each section of the liner to the lower chord surface of the gasket for downward welding, thereby reducing the welding difficulty, improving the welding quality of the radial joints, avoiding the overhead welding of traditional segment splicing, and improving the safety of the welding operation.

[0022] The trenchless pipeline repair device and method provided by the present invention provide support for adjacent liner pipes through circumferential arch supports when welding circumferential joints of adjacent sections of liner pipes, thereby improving the reliability of circumferential joint welding.

[0023] The present invention provides a trenchless pipeline repair device and method. After the liner pipes are spliced, they are welded to the corresponding gaskets through support members. The annular arch support can support the liner pipes so that the liner pipes remain stably arranged in the pipeline. There is no need to set additional supporting components in the pipeline to reliably install the liner pipes on the pipeline, thereby reducing the support cost of the liner pipes after welding.

[0024] The trenchless pipeline repair device and method provided by the present invention support the liner pipe by an annular arch support when grouting between the liner pipe and the pipeline, without the need to set additional supporting components in the pipeline, preventing the liner pipe from floating up as a whole or deforming under force, ensuring the grouting thickness, and improving the effect of trenchless pipeline grouting repair.

[0025] The trenchless pipeline repair device and method provided by the present invention anchors the gasket of the annular arch support to the pipeline after grouting between the liner pipe and the pipeline, thereby improving the reliability of the connection between the liner pipe and the pipeline and improving the repair quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the pipeline trenchless repair device;

[0027] Figure 2 It is a schematic diagram of the structure of the node where the pulley is installed on the washer;

[0028] Figure 3 It is a structural diagram of the node where the support is installed on the gasket;

[0029] Figures 4 to 8 It is a three-dimensional structural diagram of the installation process of a certain section of liner pipe on two adjacent annular arch supports;

[0030] Figure 9 It is a partially cutaway three-dimensional structural diagram of adjacent sections of inner liner pipes with radial joints staggered and installed on multiple annular arch supports;

[0031] Figure 10 It is a structural diagram before the support and the liner pipe are welded;

[0032] Figure 11 yes Figure 10 Cross-section view at AA in the middle.

[0033] As shown in the figure:

[0034] 100. Circumferential arch support;

[0035] 110, gasket, 111, first arc-shaped connecting plate, 112, second arc-shaped connecting plate;

[0036] 120, pulley;

[0037] 130, support member;

[0038] 200, inner lining pipe, 201, radial joint, 202, circumferential joint, 203, support joint, 210, first segment, 220, second segment, 230, third segment, 240, fourth segment;

[0039] 300. Pipeline. DETAILED DESCRIPTION

[0040] The present invention will be described in detail below with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are all in a very simplified form and are not accurately scaled, and are only used to facilitate and clearly illustrate the embodiments of the present invention.

[0041] Please refer to Figures 1 to 3 An embodiment of the present invention provides a trenchless pipeline repair device, comprising: a plurality of circumferential arch supports 100 of the same specifications and smaller than the diameter of the pipeline, each of the circumferential arch supports 100 including a gasket 110, a plurality of pulleys 120 evenly distributed on the inner wall of the gasket 110, and a plurality of supports 130 evenly distributed on the inner wall of the gasket 110, the supports 130 and the pulleys 120 being alternately distributed, and the height at which the supports 130 are arranged on the gasket 110 is lower than the height at which the pulleys 120 are arranged on the gasket 110.

[0042] Please refer to Figures 4 to 8The pulleys 120 on two adjacent annular arch supports 100 are used to slide the segments of a certain section of the liner pipe 200, rotate the radial joints 201 of adjacent segments to the lower chord surface of the gasket 110, and adjust the installation position of the adjacent sections of the liner pipe 200 relative to the gasket 110. To facilitate welding, the radial joints 201 of adjacent segments can be rotated via the pulleys 120 to the lowest point of the lower chord surface of the gasket 110, that is, the lower end of the vertical centerline of the gasket 110. For example: Figure 5 In the example, the radial joint seam 201 between the first segment 210 and the second segment 220 is rotated and welded on the lower chord surface of the gasket 110 .

[0043] Please refer to Figures 10 and 11 The support members 130 on the two adjacent annular arch supports 100 are used to weld the inner liner pipe 200 after adjusting the installation position to the gasket 110. Figure 10 The following example illustrates the state of the support seam 203 formed between the support member 130 and the inner liner pipe 200 before welding. Figure 11 The following figure illustrates the support gap 203 formed between the support member 130 and the inner liner 200 after welding. Support gap 203 is created because the support member 130 is installed lower than the pulley 120. Furthermore, the lower height of the support member 130 ensures that the segments do not obstruct the sliding movement of the segments. The inner liner 200 is welded to the backing ring 110 via the support member 130, ensuring that the inner liner 200 and the two circumferential arch supports 100 above it are integrally supported.

[0044] Please refer to Figure 1 To reduce installation difficulty, the trenchless pipeline repair device provided in an embodiment of the present invention comprises a gasket 110 formed by connecting multiple curved connecting plates. The multiple curved connecting plates can be embedded in sections and installed on the inner wall of the pipeline 300 to connect two adjacent curved connecting plates. The two adjacent curved connecting plates can be connected by welding or bolts. Figure 1 The figure illustrates a gasket 110 formed by connecting two curved connecting plates, namely a first curved connecting plate 111 and a second curved connecting plate 112. Gasket 110 can simply be nested and fitted onto pipe 300, or it can be bolted to pipe 300. The number of curved connecting plates is not limited to two; it can also be three or more. The term "more than" includes the number itself. The thickness of the curved connecting plates can be 1.5 to 2 times the thickness of the post-grouting wall.

[0045] Please refer to Figure 1 、 Figure 3 , Figures 10 and 11To reduce costs, the trenchless pipe repair device provided in the embodiment of the present invention can have a T-shaped or I-shaped support member 130. To improve the reliability of the welding between the support member 130 and the liner pipe 200, the side of the support member 130 close to the liner pipe 200 is an arc-shaped surface.

[0046] Please refer to Figure 1 、 Figure 2 、 Figure 4 and Figure 9 In order to facilitate the installation of the liner pipes 200 in adjacent sections, the embodiment of the present invention provides a trenchless pipe repair device, wherein the pulley 120 can be a double roller arranged on the inner wall of the gasket 110 and distributed along the width direction of the inner wall. The double roller can be composed of a roller bracket, a roller and a drum. One of the double rollers is used for the rotational welding of each pipe segment in the front section of the liner pipe 200 in the adjacent section, and the other roller of the double roller is used for the rotational welding of each pipe segment in the rear section of the liner pipe 200 in the adjacent section. That is, the width of the pipe segment is smaller than the width between adjacent gaskets 110. Preferably, the width of the pipe segment is equal to the width between the width center lines of adjacent gaskets 110, so that the circumferential joints 202 between the adjacent sections of the liner pipe 200 are conveniently connected.

[0047] Please refer to Figures 1 to 11 The embodiment of the present invention further provides a pipeline trenchless repair method, which uses the above-mentioned pipeline trenchless repair device and includes:

[0048] Step 1: Two parallel and spaced annular arch supports 100 are nested and installed in the pipeline 300, and multiple segments of a certain section of the liner pipe 200 are placed on the pulleys 120 on the gaskets 110 of the two annular arch supports 100. Two adjacent segments are slid on the gaskets 110 through the pulleys 120 so that the two adjacent segments are rotated and spliced ​​relative to the gaskets 110 and their radial splicing seams 201 are rotated to the lower chord of the gasket 110 to be welded to the radial splicing seams 201; the liner pipe 200 formed after welding the multiple segments is welded to the gaskets 110 of the corresponding annular arch support 100 through the support 130.

[0049] Step 2: A new annular arch support 100 is installed in parallel on one side of the annular arch support 100 installed in the pipeline 300. The multiple segments of the next section of the liner pipe 200 are placed on the pulleys 120 of the new annular arch support 100 and the adjacent annular arch support 100. The adjacent two segments are slid on the gasket 110 through the pulley 120 so that the adjacent two segments are rotated relative to the gasket 110 and the radial splicing seam 201 is rotated to the gasket 110. 10 is welded to the radial joint seam 201 on the lower chord surface; the section of liner pipe 200 formed after welding multiple pipe segments is rotated relative to the two annular arch supports 100 thereon through the pulley 120 so that the radial joint seam 201 of this section of liner pipe 200 and the previous section of liner pipe 200 are staggered, and the section of liner pipe 200 is welded to the gasket 110 of the corresponding annular arch support 100 through the support member 130, and the annular joint seams 202 of the adjacent sections of liner pipe 200 are welded.

[0050] Step three: repeat step two until the length of the liner pipe 200 covers the repair area of ​​the pipeline 300. Figure 9 The example shows four circumferential arch supports 100 and three sections of liner pipes 200.

[0051] Step 4: Grouting is performed between the liner pipe 200 and the pipeline 300 in the repair area to anchor the gasket 110 of the annular arch support 100 on the pipeline 300.

[0052] Please refer to Figures 4 to 8 In the trenchless pipe repair method provided by an embodiment of the present invention, the method of rotating and splicing two adjacent segments relative to the gasket 110 and rotating the radial splicing seam 201 thereof to the lower chord surface of the gasket 110 can be a method of first rotating one segment and then lowering the next segment, that is:

[0053] The previous section of the pipe segment is placed on the pulley 120 on the gasket 110 of the two adjacent circumferential arch supports 100, and the previous section of the pipe segment is rotated relative to the gasket 110 through the pulley 120 so that one end is rotated to the lower chord surface of the gasket 110, and then the next section of the pipe segment is placed on the pulley 120 on the gasket 110 of the two adjacent circumferential arch supports 100 so that it is spliced ​​with the previous section of the pipe segment to the lower chord surface of the gasket 110. Figures 4 to 8 The example of rotating welding of four segments is given in the figure, but it is not limited to four segments. The specific installation method of four segments is as follows:

[0054] Please refer to Figures 4 and 5 , place the first segment 210 on the pulley 120 on the gasket 110 of the two circumferential arch supports 100, and rotate it 90 degrees clockwise so that the lower end of the first segment 210 rotates to the lower chord surface of the gasket 110.

[0055] Please refer to Figure 5 The second segment 210 is placed on the pulley 120 on the gasket 110 of the two circumferential arch supports 100, and the second segment 220 is butted against the first segment 210 and their radial joint 201 is welded.

[0056] Please refer to Figure 6 , rotate the first tube segment 210 and the second tube segment 220 formed as a whole after welding 90 degrees clockwise, so that the lower end of the second tube segment 220 is rotated to the lower chord surface of the gasket 110.

[0057] Please refer to Figure 6 , place the third segment 230 on the pulley 120 on the gasket 110 of the two circumferential arch supports 100, and after the third segment 230 is docked with the second segment 220, weld their radial joints 201, and rotate the three segments as a whole 90 degrees clockwise.

[0058] Please refer to Figures 7 and 8 , place the fourth segment 240 on the pulley 120 on the gasket 110 of the two circumferential arch supports 100, and after the fourth segment 240 is butted against the third segment 230, weld their radial joint 201. Rotate the four segments 90 degrees clockwise as a whole, rotate the radial joint 201 between the fourth segment 240 and the first segment 210 to the lower chord surface of the gasket 110, and weld them. This completes the overall welding of the liner pipe 200. After the segments or multiple segments are rotated together, auxiliary equipment is needed to fix the rotated segments or segment groups to prevent them from moving during the welding of the radial joint 201, which would affect the welding quality.

[0059] Of course, the four segments can also rotate counterclockwise, or in a combination of clockwise and counterclockwise rotation.

[0060] In order to achieve the purpose of rotating the radial joint seam 201 of adjacent segments to the lower chord surface of the gasket 110, the trenchless pipeline repair method provided by the embodiment of the present invention can rotate the two adjacent segments relative to the gasket 110 and rotate the radial joint seam 201 to the lower chord surface of the gasket 110. The method can also be:

[0061] Two pipe segments 300 are placed on the pulleys 120 on the gaskets 110 of two adjacent circumferential arch supports 100. The two adjacent segments are slid on the gaskets 110 via the pulleys 120 so that the two adjacent segments are rotated relative to the gaskets 110 for splicing and the radial splicing seam 201 is rotated to the lower chord surface of the gasket 110. That is, after the two segments are placed, they are rotated together to adjust the position of the radial splicing seam 201.

[0062] Please refer to Figures 4 to 8In the trenchless pipeline repair device and method provided by the embodiments of the present invention, the radial joints 201 between adjacent segments of each section of the liner pipe 200 can be rotated to the lower chord surface of the gasket 110 for downward welding, which reduces the welding difficulty, improves the welding quality of the radial joints 201, avoids overhead welding at the radial joints 201 of traditional segments, and improves the safety of the welding operation.

[0063] The trenchless pipeline repair device and method provided by the embodiment of the present invention provides support for adjacent liner pipes 200 through the circumferential arch support 100 when the circumferential joints 202 of adjacent sections of liner pipes 200 are welded, thereby improving the reliability of the circumferential joint welding.

[0064] In the trenchless pipe repair device and method provided by the embodiment of the present invention, the liner pipe 200 is welded to the corresponding gasket 110 through the support member 130 after splicing. The gasket 110 can support the liner pipe 200 so that the liner pipe 200 remains stably set in the pipe 300. There is no need to set additional supporting components in the pipe 300 to reliably install the liner pipe 200 on the pipe 300, thereby reducing the support cost of the liner pipe 200 after welding.

[0065] The trenchless pipe repair device and method provided by the embodiment of the present invention supports and fixes the liner pipe 200 through the annular arch support 100 when grouting between the liner pipe 200 and the pipe 300. There is no need to set up additional support members in the pipe 300, which prevents the liner pipe 200 from floating up or deforming under stress as a whole, ensures the grouting thickness, and improves the effect of the trenchless grouting repair of the pipe 300. By welding the liner pipe 200 to each annular arch support 100 and supporting the liner pipe 200 through the annular arch support 100, it is possible to ensure that the reserved grouting thickness between the liner pipe 200 and the pipe 300 is uniform, prevent the liner pipe 200 from floating up or deforming, improve the stability of the grouting repair, and prevent non-uniform grouting. Moreover, during grouting, there is no need to set up additional supports in the pipe 300, which greatly reduces the difficulty of construction.

[0066] The trenchless pipe repair device and method provided by the embodiment of the present invention anchors the gasket 110 of the annular arch support 100 to the pipe 300 after grouting between the liner pipe 200 and the pipe 300, thereby improving the reliability of the connection between the liner pipe 200 and the pipe 300 and improving the repair quality.

[0067] The present invention is not limited to the specific embodiments described above. Obviously, the embodiments described above are only some embodiments of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention described, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention. Those skilled in the art can make other levels of modifications and changes to the present invention. In this way, if these modifications and changes of the present invention fall within the scope of the claims of the present invention, the present invention is also intended to include these changes and changes.

Claims

1. A trenchless pipeline repair device, characterized in that: include: Multiple annular arch supports of the same specifications and smaller than the diameter of the pipe, each of the annular arch supports includes a gasket, multiple pulleys evenly distributed on the inner wall of the gasket, and multiple support members evenly distributed on the inner wall of the gasket, the support members and pulleys are alternately distributed, the height at which the support members are arranged on the gasket is lower than the height at which the pulleys are arranged on the gasket, the gasket is connected by multiple sections of arc-shaped connecting plates, two adjacent arc-shaped connecting plates are welded or bolted, the support member is T-shaped or I-shaped, and the side of the support member close to the inner liner pipe is an arc-shaped surface.

2. The trenchless pipeline repair device according to claim 1, characterized in that: The pulley is a double roller arranged on the inner wall of the gasket and distributed along the width direction of the inner wall.

3. The trenchless pipeline repair device according to claim 1, characterized in that: There are four annular arch supports and three sections of inner lining pipe.

4. A trenchless pipeline repair method, characterized in that: A trenchless pipeline repair device is used, comprising: a plurality of annular arch supports of the same specifications and smaller than the diameter of the pipeline, each annular arch support comprising a gasket, a plurality of pulleys evenly distributed on the inner wall of the gasket, and a plurality of support members evenly distributed on the inner wall of the gasket, wherein the support members and the pulleys are alternately distributed, and the height at which the support members are arranged on the gasket is lower than the height at which the pulleys are arranged on the gasket. The method comprises: Step 1: Two annular arch supports are nested and installed in parallel and spaced relation in the pipeline; multiple segments of a certain section of inner liner pipe are placed on the pulleys on the gaskets of the two annular arch supports; two adjacent segments are slid on the gaskets via the pulleys so as to rotate and splice the adjacent segments relative to the gaskets and rotate the radial splicing seams to the lower chord of the gaskets to weld the radial splicing seams; the inner liner pipe formed by welding the multiple segments is welded to the gaskets of the corresponding annular arch supports via support members; Step 2: A new annular arch support is installed at a parallel interval on one side of the annular arch support installed in the pipeline, and multiple segments of the next section of the liner pipe are placed on the pulleys of the newly added annular arch support and the adjacent annular arch support, and the two adjacent segments are slid on the gasket through the pulley so that the two adjacent segments are rotated relative to the gasket and spliced, and the radial splicing seams are rotated to the lower chord of the gasket to weld the radial splicing seams; the section of the liner pipe formed after welding the multiple segments is rotated relative to the two annular arch supports thereon through the pulley so that the radial splicing seams of the section of the liner pipe and the previous section of the liner pipe are staggered, and the section of the liner pipe is welded to the gasket of the corresponding annular arch support through the support member, and the annular splicing seams of the adjacent sections of the liner pipe are welded; Step 3: Repeat step 2 until the length of the liner pipe covers the repaired area of ​​the pipeline; Step 4: Grouting is performed between the liner pipe and the pipeline in the repair area to anchor the gasket of the annular arch support to the pipeline.

5. The trenchless pipeline repair method according to claim 4, characterized in that: The method of rotating and splicing two adjacent segments relative to the gasket and rotating the radial splicing seam to the lower chord surface of the gasket includes: Place the previous section of the pipe segment on the pulleys on the gaskets of the two adjacent annular arch supports, rotate the previous section of the pipe segment relative to the gasket through the pulley so that one end is rotated to the lower chord surface of the gasket, and then place the next section of the pipe segment on the pulleys on the gaskets of the two adjacent annular arch supports so that it is spliced ​​with the previous section of the pipe segment to the lower chord surface of the gasket.

6. The trenchless pipeline repair method according to claim 4, characterized in that: The method of rotating and splicing two adjacent segments relative to the gasket and rotating the radial splicing seam to the lower chord surface of the gasket includes: Place both pipes on the pulleys on the gaskets of the two adjacent annular arch supports, slide the two adjacent pipe segments on the gaskets through the pulleys so that the two adjacent pipe segments are rotated and spliced ​​relative to the gaskets and their radial splicing seams are rotated to the lower chord surface of the gaskets.

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