Vertical assembly construction method of steel bifurcated pipe

Abstract

The application discloses a kind of vertical assembly construction methods of steel bifurcated pipe, comprising the following steps: one, the tile of steel bifurcated pipe and crescent rib plate are made;Two, pre-assembled platform is set and steel bifurcated pipe lofting is carried out;Three, pre-assembled steel bifurcated pipe;Four, steel bifurcated pipe inner support is set;Five, steel bifurcated pipe disassembly;Six, steel bifurcated pipe transportation after disassembly;Seven, steel bifurcated pipe is assembled again.The application is welded positioning block on the tile of steel bifurcated pipe by pre-assembled segment of steel bifurcated pipe, and vertical assembly method is used to assemble steel bifurcated pipe, so that steel bifurcated pipe assembly difficulty is reduced, crescent rib plate and each tile assembly positioning, adjustment is simple;Tile assembly process is single, and deformation is small, and assembly quality is higher, after assembly, high-difficulty welding such as a lot of vertical welding and overhead welding is reduced, effectively improve the steel bifurcated pipe weld quality and efficiency;Positioning is accurate and stable using positioning block, greatly reduce the bifurcated pipe assembly difficulty again.

Description

Technical Field

[0001] This invention belongs to the field of steel branch pipe assembly and construction technology, specifically relating to a vertical assembly and construction method for steel branch pipes. Background Technology

[0002] With the rapid development of pumped storage power stations, the design pressure head and single-unit installed capacity have gradually increased, leading to a gradual increase in the wall thickness, size, and material of the steel branch pipes used in pumped storage hydropower stations. The branch pipe is mainly composed of the main cone, main branch, branch cone, and crescent rib. Due to the high precision and process requirements for steel branch pipe manufacturing, power stations generally manufacture them in factories. After successful manufacturing, they are pre-assembled. After the pre-assembly is completed and accepted, they are disassembled and transported to the construction site in the form of tiles for formal assembly and welding. The common method for assembling steel branch pipes is horizontal assembly, that is, the shape of the branch pipe is consistent with the installation shape. This method is a relatively mature traditional method for assembling branch pipes. Before assembling the steel branch pipes, a large number of branch pipe assembly supports need to be made. The strength and stability of the assembly supports need to meet the requirements. However, the finished tiles are prone to deformation during storage and transportation. Horizontal assembly is difficult and inefficient. During the assembly process, the shape of the branch pipe is not well controlled, and serious out-of-roundness occurs, which increases the difficulty and accuracy of assembling irregularly shaped branch pipes. Summary of the Invention

[0003] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a vertical assembly construction method for steel branch pipes. This method involves pre-assembling steel branch pipe segments, welding positioning blocks onto the steel branch pipe's ribs, and then assembling the steel branch pipe using a vertical assembly method. This reduces the difficulty of assembling the steel branch pipe, simplifies the positioning and adjustment of the crescent-shaped ribs and individual ribs, reduces stress on the ribs during assembly, minimizes deformation, and results in higher assembly quality. After assembly, it reduces the need for overhead welding and extensive vertical welding, effectively improving the welding quality and efficiency of the steel branch pipe welds. Furthermore, the accurate and stable positioning using positioning blocks significantly reduces the difficulty of secondary assembly of the branch pipe.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for vertical assembly and construction of steel branch pipes, characterized in that the method includes the following steps:

[0005] Step 1: Fabrication of the steel branch pipe tiles and crescent ribs: According to the construction drawings of the steel branch pipe, the steel branch pipe is divided into the main cone, main branch, and branch cone. Multiple tiles and crescent ribs are prefabricated in the factory. The multiple tiles are the main cone section tiles, two main branch section tiles, and four branch cone section tiles. The main cone section tiles are marked as C1 section tiles, the two main branch section tiles are marked as C2-1 section tiles and C3-1 section tiles, and the four branch cone section tiles are marked as C2-2 section tiles, C2-3 section tiles, C3-2 section tiles, and C3-3 section tiles, respectively.

[0006] Step 2: Set up a pre-assembly platform and lay out the steel branch pipe: Set up a process platform in the factory and lay out the center cross line of the steel branch pipe, the outline of the upper pipe opening of the main cone, the outline of the lower pipe opening of the main cone, the outline of the upper pipe opening of the main branch, and the outline of the upper pipe opening of the branch cone on the process platform.

[0007] Step 3: Pre-assemble the steel branch pipe: Based on the layout results on the process platform, the C1 segment tile, C2-1 segment tile, crescent rib plate, C3-1 segment tile, C2-2 segment tile, C2-3 segment tile, C3-2 segment tile and C3-3 segment tile are pre-assembled on the process platform in the order from bottom to top and from left to right using a vertical assembly method. A tile assembly seam is formed between every two interconnected tiles.

[0008] During the pre-assembly of the steel branch pipe, one or more positioning blocks are welded at each of the tile assembly joints. The positioning blocks include a truncated cone positioning block and a grooved positioning block that mates with the truncated cone positioning block. Before welding the positioning blocks, the truncated cone positioning block and the grooved positioning block are connected and tightened with bolts. Then, the truncated cone positioning block and the grooved positioning block are welded to the two tiles on both sides of the tile assembly joint.

[0009] Step 4: Install internal supports for the steel branch pipe: Weld support rods to the inside of the C1 segment tile, C2-1 segment tile, C3-1 segment tile, C2-2 segment tile, C2-3 segment tile, C3-2 segment tile and C3-3 segment tile respectively.

[0010] Step 5: Disassembly of the steel branch pipe: Remove the bolts on the multiple positioning blocks on the pre-assembled steel branch pipe, and then remove the C3-3 section tile, C3-2 section tile, C2-3 section tile, C2-2 section tile, C3-1 section tile, crescent rib, C2-1 section tile and C1 section tile in sequence;

[0011] Step Six: Transportation of the disassembled steel branch pipe: Transport the crescent-shaped ribs, multiple bolts, and tiles with support rods formed after the steel branch pipe is disassembled to the construction site;

[0012] Step 7: Secondary Assembly of Steel Branch Pipes: Using a vertical assembly method, assemble the C1 section tile, C2-1 section tile, crescent rib, C3-1 section tile, C2-2 section tile, C2-3 section tile, C3-2 section tile, and C3-3 section tile sequentially on the construction site;

[0013] During the secondary assembly of the steel branch pipe, bolts are used to connect the cone-shaped positioning blocks and groove positioning blocks on both sides of each tile assembly joint.

[0014] The above-mentioned method for vertical assembly of steel branch pipes is characterized in that: in step three, when pre-assembling the C1 segment tile, the C1 segment tile is hoisted onto the process platform using a lifting device, and the lower pipe opening of the C1 segment tile is aligned with the outline of the lower pipe opening of the main cone. Multiple plumb bobs are suspended at the upper pipe opening of the C1 segment tile. The error of the upper pipe opening of the C1 segment tile is determined by measuring the distance between the plumb bobs and the outline of the lower pipe opening of the main cone. When the error of the upper pipe opening of the C1 segment tile is greater than the set error, a jack is used to correct the upper pipe opening of the C1 segment tile.

[0015] A method for vertical assembly of steel branch pipes is characterized in that: in step three, when pre-assembling C2-1 section tiles, C3-1 section tiles, C2-2 section tiles, C2-3 section tiles, C3-2 section tiles or C3-3 section tiles, the error measurement and correction of the pipe opening on the tiles are carried out in accordance with the method for pre-assembling C1 section tiles.

[0016] The above-mentioned vertical assembly construction method for steel branch pipe is characterized in that: in step three, when pre-assembling the crescent rib plate, the crescent rib plate is hoisted onto the C1 segment tile using a lifting tool, and the crescent rib plate is tightly attached to one side of the C2-1 segment tile. Multiple limiting components for limiting the crescent rib plate are installed on the C2-1 segment tile.

[0017] The limiting component includes an L-shaped positioning component that can be detachably installed on the C2-1 segment tile and a threaded push rod installed on the L-shaped positioning component for pressing against the crescent rib plate.

[0018] The above-mentioned method for vertical assembly of steel branch pipe is characterized in that: a threaded connecting post is provided at one end of the L-shaped positioning component away from the threaded push rod, a locking nut is threaded on the threaded connecting post, an internal threaded hole for installing the threaded push rod is provided at the other end of the L-shaped positioning component, and a suction cup rubber pad is provided at one end of the threaded push rod.

[0019] The above-mentioned method for vertical assembly of steel branch pipes is characterized in that: both the truncated cone positioning block and the groove positioning block are provided with bolt holes for bolts to pass through, the diameter of the bolt holes is larger than the diameter of the bolt thread, the truncated cone positioning block includes a positioning cone and a connecting flange provided on one side of the positioning cone, and one side of the groove positioning block has a truncated cone-shaped groove that matches the positioning cone.

[0020] The positioning truncated cone and the bolt holes on the truncated cone positioning block are arranged coaxially, and the truncated cone-shaped groove and the bolt holes on the groove positioning block are arranged coaxially.

[0021] The above-mentioned method for vertical assembly of steel branch pipes is characterized in that: the bolt end passes through the bolt holes on the groove positioning block and the cone positioning block in sequence and is then threadedly connected to the adjusting nut.

[0022] The above-mentioned method for vertical assembly of steel branch pipes is characterized in that: the connecting flange is connected to the large end of the positioning truncated cone, and the top diameter of the truncated cone groove is larger than the bottom diameter of the truncated cone groove.

[0023] The above-mentioned method for vertical assembly of steel branch pipes is characterized in that: the height of the truncated cone positioning block is equal to the height of the groove positioning block, and the width of the truncated cone positioning block is equal to the width of the groove positioning block.

[0024] The above-mentioned method for vertical assembly of steel branch pipes is characterized in that: the connecting flange of the cone positioning block and the tile connected thereto, as well as the groove positioning block and the tile connected thereto, are all welded; the weld between the connecting flange and the tile is located on the side of the connecting flange away from the tile assembly seam; and the weld between the groove positioning block and the tile is located on the side of the groove positioning block away from the tile assembly seam.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. This invention uses a vertical assembly method for the pre-assembly of steel branch pipes. Before the pre-assembly of the steel branch pipes, it is only necessary to lay out the upper and lower pipe opening lines of the main cone, main branch, and branch cone of the steel branch pipe on the process platform. This can effectively control the shape of the steel branch pipe during the pre-assembly process. At the same time, it is not necessary to make a large number of steel branch pipe assembly supports during the assembly process, which can effectively reduce the assembly difficulty of the steel branch pipes and improve the assembly efficiency.

[0027] 2. This invention effectively solves the problem that traditional positioning methods do not have a fixing function by setting a truncated cone positioning block and a groove positioning block on both sides of the tile assembly seam, and connecting the truncated cone positioning block and the groove positioning block with bolts, and can effectively reduce the positioning welding of tiles during the assembly process.

[0028] 3. This invention, by welding positioning blocks onto the tiles of the pre-assembled steel branch pipe segments, ensures that the positioning blocks can be installed with high forming accuracy of the steel branch pipe. This facilitates the secondary assembly of the steel branch pipe using the installed positioning blocks, effectively improving the efficiency of the secondary assembly of the steel branch pipe and effectively solving the problems of poor positioning accuracy and high difficulty in the secondary assembly of the steel branch pipe.

[0029] 4. By welding support rods inside each pre-assembled tile, this invention can effectively reduce the possibility of deformation of the tiles during storage and transportation, thereby effectively ensuring the shape of the assembled steel branch pipe and improving the assembly accuracy of the steel branch pipe.

[0030] 5. When performing secondary assembly of steel branch pipes, this invention adjusts the tightness of the bolts and utilizes the self-anchoring properties of the conical positioning block and the groove positioning block to adjust the gap and misalignment between the two tiles. No further reinforcement is required, making secondary assembly convenient and quick, greatly reducing assembly difficulty and improving construction efficiency.

[0031] In summary, this invention reduces the difficulty of assembling steel branch pipes by pre-assembling segments, welding positioning blocks onto the tiles of the steel branch pipes, and using a vertical assembly method. This simplifies the positioning and adjustment of the crescent-shaped ribs and individual tiles during assembly. The tiles experience single-point stress and minimal deformation during assembly, resulting in higher assembly quality. After assembly, it reduces the need for overhead welding and extensive vertical welding, effectively improving the welding quality and efficiency of the steel branch pipe welds. Furthermore, the accurate and stable positioning of the positioning blocks significantly reduces the difficulty of secondary assembly of the branch pipes.

[0032] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0033] Figure 1 This is a flowchart of the present invention.

[0034] Figure 2 This is a schematic diagram of the pre-assembled structure of the steel branch pipe of the present invention.

[0035] Figure 3 This is a diagram showing the connection structure of the C1 segment tile, the C2-1 segment tile, and the positioning block.

[0036] Figure 4 for Figure 3 Top view.

[0037] Figure 5 This is a schematic diagram of the connection structure of the C2-1 segment tile, crescent rib, and limiting member of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] Detailed Implementation

[0040] A method for vertical assembly and construction of steel branch pipes, such as Figures 1 to 4 As shown, the method includes the following steps:

[0041] Step 1: Fabrication of the steel branch pipe tiles and crescent ribs: According to the construction drawings of the steel branch pipe, the steel branch pipe is divided into the main cone, main branch, and branch cone. Multiple tiles and crescent ribs 12 are prefabricated in the factory. The multiple tiles are the main cone section tiles, two main branch section tiles, and four branch cone section tiles. The main cone section tiles are marked as C1 section tiles 10, the two main branch section tiles are marked as C2-1 section tiles 11 and C3-1 section tiles 13, and the four branch cone section tiles are marked as C2-2 section tiles 14, C2-3 section tiles 15, C3-2 section tiles 16, and C3-3 section tiles 17.

[0042] It should be noted that the branch pipe tiles are divided into sections, arranged, cut, beveled, and rolled or pressed into shape according to requirements; after passing the acceptance inspection, they are ready for assembly and use.

[0043] Step 2: Set up a pre-assembly platform and lay out the steel branch pipe: Set up a process platform 1 in the factory, and lay out the center cross line of the steel branch pipe, the outline of the upper pipe opening of the main cone, the outline of the lower pipe opening of the main cone, the outline of the upper pipe opening of the main branch, and the outline of the upper pipe opening of the branch cone on the process platform 1.

[0044] It should be noted that before laying out on process platform 1, the level of process platform 1 needs to be adjusted so that the deviation between any two points on the upper surface of process platform 1 does not exceed 0.5mm. At the same time, process platform 1 should be firmly fixed to prevent it from shifting during the pre-assembly of steel branch pipes.

[0045] In practice, it is best to mark the centerline point of the steel branch pipe, the outline of the upper pipe opening of the main cone, the outline of the lower pipe opening of the main cone, the outline of the upper pipe opening of the main branch, and the outline of the upper pipe opening of the branch cone on the process platform 1, so as to facilitate the subsequent verification of the pre-assembled steel branch pipe.

[0046] In specific implementation, the process platform 1 is a rectangular platform with at least two right-angled triangular support blocks 22 on the bottom of each side. By adjusting the support width of the right-angled triangular support blocks 22 at the bottom of the process platform 1, the levelness of the process platform 1 is adjusted. An anchor rod 23 is provided at the bottom of the right-angled triangular support block 22, and a limiting block 24 for limiting the process platform 1 is provided on one side of the right-angled triangular support block 22. The limiting block 24 can move up and down along the right-angled triangular support block 22.

[0047] It should be noted that the right-angled triangular support block 22 has a vertical mounting plate on its side for mounting the limiting block 24. The vertical mounting plate has an oblong hole arranged vertically. A bolt is provided on one side of the limiting block 24. The bolt passes through the oblong hole and is fastened to the adjusting nut.

[0048] Step 3: Pre-assemble the steel branch pipe: Based on the layout results on process platform 1, such as... Figure 2 As shown, the C1 segment tile 10, C2-1 segment tile 11, crescent rib 12, C3-1 segment tile 13, C2-2 segment tile 14, C2-3 segment tile 15, C3-2 segment tile 16 and C3-3 segment tile 17 are pre-assembled on the process platform 1 in a vertical assembly manner from bottom to top and from left to right. A tile assembly seam is formed between every two interconnected tiles.

[0049] During the pre-assembly of the steel branch pipe, one or more positioning blocks are welded at each of the tile assembly joints, such as... Figure 3 and Figure 4 As shown, the positioning block includes a frustum positioning block 3 and a groove positioning block 6 that mates with the frustum positioning block 3. Before welding the positioning block, the frustum positioning block 3 and the groove positioning block 6 are connected and tightened by bolts 8. Then, the frustum positioning block 3 and the groove positioning block 6 of the positioning block are welded to the two tiles on both sides of the tile splicing seam.

[0050] It should be noted that when pre-assembling the steel branch pipe, the tiles are pre-assembled in the order of main cone first, then main branch, and finally support cone. The main branch section and support cone section are assembled in the order of left to right, and the crescent rib plate 12 is assembled synchronously with the main branch.

[0051] In practice, before welding the positioning block at each tile assembly seam, it is necessary to ensure that the error between the projection of the assembled tile's large opening on the process platform 1 and the layout line is within the set error range.

[0052] In actual use, by setting a truncated cone positioning block 3 and a groove positioning block 6 on both sides of the tile assembly seam, and connecting the truncated cone positioning block 3 and the groove positioning block 6 with bolts 8, the problem of the traditional positioning method not having a fixing function can be effectively solved. It can effectively reduce the positioning welding of the tiles during the assembly process, and at the same time reduce the high-difficulty welding such as overhead welding and a large number of vertical welding.

[0053] It should be noted that by welding positioning blocks onto the tiles of the pre-assembled steel branch pipe segments, it is possible to ensure that the positioning blocks are installed with high forming accuracy of the steel branch pipe. This facilitates the secondary assembly of the steel branch pipe using the installed positioning blocks, effectively improving the efficiency of the secondary assembly of the steel branch pipe and effectively solving the problems of poor positioning accuracy and high difficulty in the secondary assembly of the steel branch pipe.

[0054] In practice, the steel branch pipe is pre-assembled using a vertical assembly method. Before the pre-assembly of the steel branch pipe, it is only necessary to lay out the upper and lower pipe opening layout lines of the main cone, main branch, and branch cone of the steel branch pipe on the process platform 1. This can effectively control the shape of the steel branch pipe during the pre-assembly process. At the same time, it is not necessary to make a large number of steel branch pipe assembly supports during the assembly process, which can effectively reduce the assembly difficulty of the steel branch pipe and improve the assembly efficiency of the steel branch pipe.

[0055] Step 4: Install internal supports for the steel branch pipe: Weld support rods to the inside of the pre-assembled steel branch pipe, respectively, on the inner side of the C1 segment tile 10, C2-1 segment tile 11, C3-1 segment tile 13, C2-2 segment tile 14, C2-3 segment tile 15, C3-2 segment tile 16 and C3-3 segment tile 17;

[0056] It should be noted that by welding support rods inside each pre-assembled tile, the possibility of deformation of the tile during storage and transportation can be effectively reduced, thereby effectively ensuring the shape of the assembled steel branch pipe and improving the assembly accuracy of the steel branch pipe.

[0057] In practice, when welding the support rods, multiple support rods are welded in the radial or chordal direction of the C1 segment tile 10, ear plates are welded on both sides of the other tiles, and multiple support rods are welded between the two ear plates. The support rods can be set up using scissor bracing.

[0058] Step 5: Disassembly of the steel branch pipe: Remove bolts 8 from the multiple positioning blocks on the pre-assembled steel branch pipe, and then remove the C3-3 segment tile 17, C3-2 segment tile 16, C2-3 segment tile 15, C2-2 segment tile 14, C3-1 segment tile 13, crescent rib plate 12, C2-1 segment tile 11 and C1 segment tile 10 in sequence;

[0059] It should be noted that when disassembling the steel branch pipe, it is only necessary to remove the bolts 8 on each positioning block.

[0060] Step 6: Transportation of the disassembled steel branch pipe: Transport the crescent-shaped ribs 12, multiple bolts 8, and tiles with support rods formed after the steel branch pipe is disassembled to the construction site;

[0061] Step 7, Secondary assembly of steel branch pipes: Using a vertical assembly method, assemble C1 segment tile 10, C2-1 segment tile 11, crescent rib plate 12, C3-1 segment tile 13, C2-2 segment tile 14, C2-3 segment tile 15, C3-2 segment tile 16 and C3-3 segment tile 17 sequentially on the construction site;

[0062] During the secondary assembly of the steel branch pipe, bolts 8 are used to connect the cone-shaped positioning blocks 3 and the grooved positioning blocks 6 on both sides of each tile assembly joint. By adjusting the tightness of the bolts 8, the self-anchoring performance of the inclined surfaces of the cone-shaped positioning blocks 3 and the grooved positioning blocks 6 is used to adjust the gap and misalignment between the two tiles until the gap and misalignment between the two tiles are within the set range.

[0063] In practice, during the secondary assembly of the steel branch pipe, the tightness of the bolts 8 is adjusted, and the self-anchoring performance of the conical positioning block 3 and the groove positioning block 6 is used to adjust the gap and misalignment between the two tiles. No further reinforcement is required, making the secondary assembly convenient and quick, greatly reducing the assembly difficulty and improving construction efficiency.

[0064] In specific implementation, during the pre-assembly of C1 segment tile 10 in step three, C1 segment tile 10 is hoisted onto process platform 1 using a lifting device, and the lower pipe opening of C1 segment tile 10 is aligned with the outline of the lower pipe opening of the main cone. Multiple plumb bobs are suspended at the upper pipe opening of C1 segment tile 10. The error of the upper pipe opening of C1 segment tile 10 is determined by measuring the vertical distance between the plumb bobs and the outline of the lower pipe opening of the main cone. When the error of the upper pipe opening of C1 segment tile 10 is greater than the set error, jacks are used to correct the upper pipe opening of C1 segment tile 10 until the plumb bobs suspended at the upper pipe opening of C1 segment tile 10 are aligned with the outline of the upper pipe opening of the main cone, or the vertical distance between the plumb bobs suspended at the upper pipe opening of C1 segment tile 10 and the outline of the upper pipe opening of the main cone is less than the set error.

[0065] It should be noted that a check line is also set on the outer ring of the profile of the lower pipe opening of the main cone. After the C1 segment tile 10 is dropped onto the process platform 1, the distance between the inner ring of the lower pipe opening of the C1 segment tile 10 and the center point of the central cross line is measured, and the distance between the outer ring of the lower pipe opening of the C1 segment tile 10 and the check line is also measured. If the measured value exceeds the set error, the C1 segment tile 10 is corrected by using a jack. The set error is generally 2mm to 3mm.

[0066] In practice, when assembling each tile, multiple plumb bobs are set at the pipe opening on the tile. A plumb bob is suspended every 200mm to 300mm along the circumference of the tile, and the error between the plumb bob and the outline of the pipe opening on the laid-out segment is measured. When the error exceeds 2mm to 3mm, the tile is corrected using a jack. If the corrected tile is uneven, the pipe opening of the tile is ground smooth using a grinding wheel.

[0067] In specific implementation, during step three, when pre-assembling C2-1 segment tile 11, C3-1 segment tile 13, C2-2 segment tile 14, C2-3 segment tile 15, C3-2 segment tile 16, or C3-3 segment tile 17, the error measurement and correction of the pipe opening on the tile shall be performed in accordance with the method for pre-assembling C1 segment tile 10.

[0068] In actual use, when pre-assembling C2-1 segment tile 11, pre-assemble C2-1 segment tile 11 onto C1 segment tile 10 according to the diagram. Use a plumb line to check the alignment of the pipe opening on C2-1 segment tile 11 with the ground line. Hang a plumb line every 200mm to 300mm along the circumference of the pipe opening on C2-1 segment tile 11. Determine the error of the pipe opening on C2-1 segment tile 11 by measuring the distance between the plumb line and the ground line outlining the pipe opening on the main fork. When the error is within the set range, spot weld the positioning block to fix C2-1 segment tile 11 onto C1 segment tile 10 strictly according to the requirements.

[0069] When pre-assembling C3-1 segment tile 13, pre-install C3-1 segment tile 13 on C1 segment tile 10 on the right side of crescent rib plate 12 according to the diagram. Check the alignment of the pipe opening on C3-1 segment tile 13 with the ground line by using a plumb line. Hang a plumb line every 200mm to 300mm along the circumference of the pipe opening on C3-1 segment tile 13. Determine the error of the pipe opening on C3-1 segment tile 13 by measuring the distance between the plumb line and the ground line of the pipe opening outline on the main fork. When the error is within the set range, spot weld the positioning block as required to fix C3-1 segment tile 13 on C1 segment tile 10.

[0070] Pre-install C2-2 segment tile 14 and C2-3 segment tile 15 onto C2-1 segment tile 11 according to the drawings. Check the alignment of the pipe openings on C2-2 segment tile 14 and C2-3 segment tile 15 with the ground line using a plumb line. Hang a plumb line every 200mm-300mm along the circumference of the pipe openings on C2-2 segment tile 14 and C2-3 segment tile 15. Measure the alignment of the plumb line with the upper pipe of the support cone. The distance between the contour lines determines the error of the pipe opening on C2-2 segment tile 14 and C2-3 segment tile 15. When the error is within the set range, spot weld the fixing positioning block strictly according to the requirements to fix C2-2 segment tile 14 and C2-3 segment tile 15 on C1 segment tile 10; in the same way, assemble C3-2 segment tile 16 or C3-3 segment tile 17 on C3-1 segment tile 13.

[0071] like Figure 5As shown, in specific implementation, in step three, when the crescent rib plate 12 is pre-assembled, the crescent rib plate 12 is hoisted onto the C1 segment tile 10 using a lifting device, so that both ends of the crescent rib plate 12 are supported on the upper sides of the C1 segment tile 10, and the crescent rib plate 12 is tightly attached to one side of the C2-1 segment tile 11. Multiple limiting components for limiting the crescent rib plate 12 are installed on the C2-1 segment tile 11.

[0072] The limiting component includes an L-shaped positioning component 18 that can be detachably installed on the C2-1 segment tile 11 and a threaded push rod 19 installed on the L-shaped positioning component 18 and used to press against the crescent rib plate 12.

[0073] In actual use, after the crescent rib 12 is assembled, a plumb line is suspended at the top center of the crescent rib 12 to check the verticality of the crescent rib 12, and the position of the crescent rib 12 is adjusted until the projection of the plumb line on the process platform 1 coincides with the center point of the cross line.

[0074] It should be noted that a threaded connecting post 20 is provided at one end of the L-shaped positioning part 18 away from the threaded push rod 19. A locking nut 20-1 is threadedly fitted on the threaded connecting post 20. A threaded push rod through hole is provided at the other end of the L-shaped positioning part 18 for the threaded push rod 19 to pass through. Two adjusting nuts are threadedly installed on the threaded push rod 19. The two adjusting nuts are located on both sides of the other end of the L-shaped positioning part 18. A suction cup rubber pad 21 for pressing against the crescent rib plate 12 is provided at one end of the threaded push rod 19.

[0075] In actual use, when installing multiple limiting parts for limiting the crescent rib 12 on the C2-1 segment tile 11, the locking nut 20-1 is welded to the C2-1 segment tile 11, and then the threaded push rod 19 is rotated so that the threaded push rod 19 is pressed against the crescent rib 12.

[0076] In specific implementation, both the truncated cone positioning block 3 and the groove positioning block 6 are provided with bolt holes for the bolt 8 to pass through. The diameter of the bolt hole is larger than the diameter of the bolt 8. The truncated cone positioning block 3 includes a positioning truncated cone 4 and a connecting flange 5 provided on one side of the positioning truncated cone 4. The groove positioning block 6 has a truncated cone-shaped groove 7 on one side that matches the positioning truncated cone 4. The distance between the center line of the positioning truncated cone 4 and the outer side of the tile connected to it is equal to the distance between the center line of the truncated cone-shaped groove 7 and the outer side of the tile connected to it.

[0077] The bolt holes on the positioning truncated cone 4 and the truncated cone positioning block 3, as well as the bolt holes on the truncated cone-shaped groove 7 and the groove positioning block 6, are all arranged coaxially.

[0078] It should be noted that by setting a connecting flange 5 on one side of the positioning cone 4 to form a cone positioning block 3, and setting a cone-shaped groove 7 on one side of the groove positioning block 6, and making the bolt through hole diameters on the cone positioning block 3 and the groove positioning block 6 larger than the bolt diameter of the bolt 8, the self-anchoring performance of the cone's inclined surface can be effectively utilized. In conjunction with the bolt 8, the two tiles can be adjusted and fixed. By adjusting the tightness of the bolts, the tile gap and misalignment can be adjusted, making secondary assembly convenient and quick, greatly reducing the assembly difficulty and improving construction efficiency.

[0079] It should be noted that when connecting the frustum positioning block 3 and the groove positioning block 6, the positioning frustum 4 is inserted into the frustum-shaped groove 7. After the frustum positioning block 3 and the groove positioning block 6 are connected, the positioning frustum 4 and the frustum-shaped groove 7 are arranged coaxially.

[0080] In practice, the screw end of the bolt 8 passes through the bolt holes on the groove positioning block 6 and the cone positioning block 3 in sequence and is then threadedly connected to the adjusting nut 9.

[0081] In actual use, the gap between the tiles and the amount of misalignment can be adjusted by turning the knob and adjusting nut 9.

[0082] In specific implementation, the connecting flange 5 is connected to the large end of the positioning truncated cone 4, and the top diameter of the truncated cone groove 7 is larger than the bottom diameter of the truncated cone groove 7.

[0083] In specific implementation, the height of the frustum positioning block 3 is equal to the height of the groove positioning block 6, and the width of the frustum positioning block 3 is equal to the width of the groove positioning block 6.

[0084] In actual use, the groove positioning block 6 is formed by opening a frustum-shaped groove 7 on a rectangular block.

[0085] In specific implementation, the connecting flange 5 of the truncated cone positioning block 3 and the tile connected thereto, as well as the groove positioning block 6 and the tile connected thereto, are all welded. The weld 2 between the connecting flange 5 and the tile is located on the side of the connecting flange 5 away from the tile assembly seam, and the weld 2 between the groove positioning block 6 and the tile is located on the side of the groove positioning block 6 away from the tile assembly seam.

[0086] In actual use, weld 2 is positioned away from the tile assembly joint to facilitate operation by construction personnel.

[0087] In practice, the size of the cone-shaped positioning block 3, the height of the weld and the size of the bolts are determined according to the weight of the tiles and the spacing between them. It is necessary to ensure that the strength meets the requirements. After assembling according to the drawing, it can be used.

[0088] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for vertical assembly and construction of steel branch pipes, characterized in that, The method includes the following steps: Step 1: Fabrication of steel branch pipe tiles and crescent ribs: According to the construction drawings of the steel branch pipe, the steel branch pipe is divided into main cone, main branch and branch cone. Multiple tiles and crescent ribs (12) are prefabricated in the factory. The multiple tiles are main cone section tiles, two main branch section tiles and four branch cone section tiles. The main cone section tiles are marked as C1 section tiles (10). The two main branch section tiles are marked as C2-1 section tiles (11) and C3-1 section tiles (13) respectively. The four branch cone section tiles are marked as C2-2 section tiles (14), C2-3 section tiles (15), C3-2 section tiles (16) and C3-3 section tiles (17) respectively. Step 2: Set up a pre-assembly platform and lay out the steel branch pipe: Set up a process platform (1) in the factory and lay out the center cross line of the steel branch pipe, the outline of the upper pipe opening of the main cone, the outline of the lower pipe opening of the main cone, the outline of the upper pipe opening of the main branch and the outline of the upper pipe opening of the branch cone on the process platform (1). Step 3: Pre-assemble the steel branch pipe: According to the layout results on the process platform (1), the C1 segment tile (10), C2-1 segment tile (11), crescent rib plate (12), C3-1 segment tile (13), C2-2 segment tile (14), C2-3 segment tile (15), C3-2 segment tile (16) and C3-3 segment tile (17) are pre-assembled on the process platform (1) in the order from bottom to top and from left to right using the vertical assembly method. A tile assembly seam is formed between each pair of interconnected tiles. In the pre-assembly process of the steel branch pipe, one or more positioning blocks are welded at each of the tile assembly joints. The positioning blocks include a truncated cone positioning block (3) and a groove positioning block (6) that cooperates with the truncated cone positioning block (3). Before welding the positioning blocks, the truncated cone positioning block (3) and the groove positioning block (6) are connected and tightened by bolts (8). Then, the truncated cone positioning block (3) and the groove positioning block (6) of the positioning blocks are welded to the two tiles on both sides of the tile assembly joint. Step 4: Install internal supports for the steel branch pipe: Inside the pre-assembled steel branch pipe, weld support rods to the inside of the C1 segment tile (10), C2-1 segment tile (11), C3-1 segment tile (13), C2-2 segment tile (14), C2-3 segment tile (15), C3-2 segment tile (16) and C3-3 segment tile (17), respectively. Step 5: Disassemble the steel branch pipe: Remove the bolts (8) on the multiple positioning blocks on the pre-assembled steel branch pipe, and remove the C3-3 segment tile (17), C3-2 segment tile (16), C2-3 segment tile (15), C2-2 segment tile (14), C3-1 segment tile (13), crescent rib (12), C2-1 segment tile (11) and C1 segment tile (10) in sequence. Step 6, Transportation of steel branch pipe after disassembly: Transport the crescent rib plate (12), multiple bolts (8) and tiles with support rods formed after disassembling the steel branch pipe to the construction site; Step 7, Secondary assembly of steel branch pipes: Using a vertical assembly method, assemble the C1 segment tile (10), C2-1 segment tile (11), crescent rib (12), C3-1 segment tile (13), C2-2 segment tile (14), C2-3 segment tile (15), C3-2 segment tile (16) and C3-3 segment tile (17) in sequence on the construction site. In the secondary assembly process of the steel branch pipe, bolts (8) are used to connect the cone positioning block (3) and the groove positioning block (6) on both sides of the tile assembly joint. By adjusting the tightness of the bolts (8), the self-anchoring performance of the inclined surface of the cone positioning block (3) and the groove positioning block (6) is used to adjust the gap and misalignment between the two tiles until the gap and misalignment between the two tiles are within the set range. In step three, when the crescent rib (12) is pre-assembled, the crescent rib (12) is hoisted onto the C1 segment tile (10) using a lifting device, and the crescent rib (12) is tightly attached to one side of the C2-1 segment tile (11). Multiple limiting components for limiting the crescent rib (12) are installed on the C2-1 segment tile (11). The limiting component includes an L-shaped positioning component (18) that is detachably mounted on the C2-1 segment tile (11) and a threaded push rod (19) mounted on the L-shaped positioning component (18) and used to press against the crescent rib plate (12). The L-shaped positioning component (18) is provided with a threaded connecting post (20) at one end away from the threaded push rod (19), and a locking nut (20-1) is threaded on the threaded connecting post (20). The other end of the L-shaped positioning component (18) is provided with an internal threaded hole for the threaded push rod (19) to be installed, and a suction cup rubber pad (21) is provided at one end of the threaded push rod (19). Both the cone-shaped positioning block (3) and the groove positioning block (6) are provided with bolt holes for the bolts (8) to pass through. The diameter of the bolt holes is larger than the diameter of the bolt (8).

2. The vertical assembly construction method for steel branch pipes according to claim 1, characterized in that: In step three, when pre-assembling the C1 segment tile (10), the C1 segment tile (10) is hoisted onto the process platform (1) using a hoisting tool, and the lower pipe opening of the C1 segment tile (10) is aligned with the outline of the lower pipe opening of the main cone. Multiple plumb bobs are suspended at the upper pipe opening of the C1 segment tile (10). The error of the upper pipe opening of the C1 segment tile (10) is determined by measuring the distance between the plumb bobs and the outline of the lower pipe opening of the main cone. When the error of the upper pipe opening of the C1 segment tile (10) is greater than the set error, a jack is used to correct the upper pipe opening of the C1 segment tile (10).

3. The vertical assembly construction method for steel branch pipes according to claim 2, characterized in that: In step three, when pre-assembling C2-1 segment tiles (11), C3-1 segment tiles (13), C2-2 segment tiles (14), C2-3 segment tiles (15), C3-2 segment tiles (16) or C3-3 segment tiles (17), the error measurement and correction of the pipe openings on the tiles shall be carried out in accordance with the method of pre-assembling C1 segment tiles (10).

4. The vertical assembly construction method for steel branch pipes according to claim 1, characterized in that: The frustum positioning block (3) includes a positioning frustum (4) and a connecting flange (5) provided on one side of the positioning frustum (4). The groove positioning block (6) has a frustum-shaped groove (7) on one side that matches the positioning frustum (4). The positioning truncated cone (4) and the bolt holes on the truncated cone positioning block (3) are arranged coaxially, and the truncated cone-shaped groove (7) and the bolt holes on the groove positioning block (6) are arranged coaxially.

5. A vertical assembly construction method for steel branch pipes according to claim 1, characterized in that: The screw end of the bolt (8) passes through the bolt holes on the groove positioning block (6) and the cone positioning block (3) in sequence and is then threadedly connected to the adjusting nut (9).

6. A vertical assembly construction method for steel branch pipes according to claim 4, characterized in that: The connecting flange (5) is connected to the large end of the positioning truncated cone (4), and the top diameter of the truncated cone groove (7) is larger than the bottom diameter of the truncated cone groove (7).

7. A vertical assembly construction method for steel branch pipes according to claim 1, characterized in that: The height of the frustum positioning block (3) is equal to the height of the groove positioning block (6), and the width of the frustum positioning block (3) is equal to the width of the groove positioning block (6).

8. A vertical assembly construction method for steel branch pipes according to claim 1, characterized in that: The connecting flange (5) of the truncated cone positioning block (3) and the tile connected thereto, as well as the groove positioning block (6) and the tile connected thereto, are welded together. The weld (2) between the connecting flange (5) and the tile is located on the side of the connecting flange (5) away from the tile assembly seam. The weld (2) between the groove positioning block (6) and the tile is located on the side of the groove positioning block (6) away from the tile assembly seam.

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