A roundness control tool for a steel vertical tank and its application method

Abstract

A roundness control tooling for a steel vertical tank and its application method. The tooling includes a cylinder section that needs to be made on site, a center positioning support is provided inside the cylinder section, and both ends of the center positioning support are connected to the inner wall of the cylinder section through at least four control rods, and the height of the center positioning support matches that of the cylinder section; the center positioning support includes two sets of positioning connection plates, and the two sets of positioning connection plates are connected through column steel pipes, and the center of the column steel pipe is the same as that of the positioning connection plates; the control rod includes a universal control rod and a special control rod, one end of the universal control rod is connected to the positioning connection plate, and the other end of the universal control rod is connected to the inner wall of the cylinder section through a special control rod. The present invention is used to control or reduce the deformation of a large steel vertical tank body due to uneven thermal stress during on-site construction and welding, resulting in the inability to install prefabricated internal parts, or the failure to achieve the design accuracy after installation, affecting the performance of the equipment.

Description

Technical Field

[0001] The invention relates to a control tool and belongs to the technical field of mechanical devices, in particular to a roundness control tool for large-scale steel vertical circular equipment and an application method thereof. Background Art

[0002] Due to the limitation of transportation conditions, large steel vertical circular tanks or equipment (generally with a diameter of more than 5 meters) cannot be transported to the site for direct installation after being manufactured in the factory. According to the size of the tank, it needs to be cut into blocks and rolled into prefabricated dome-shaped parts in the factory, and then properly packaged and tire-mounted to prevent deformation during transportation before being transported to the site. The arc-shaped steel plates prefabricated in the factory are welded on site to form a circle of cylinder sections. Due to the limitation of the width of the steel plate and the plate rolling machine, the height of each section (circle) is generally based on the steel plate width. Therefore, it is necessary to weld multiple circles of cylinder sections into equipment of the required height.

[0003] Each circle of cylinder segments has multiple cluster welds, which often cannot be welded simultaneously and at the same speed. Under the action of local thermal stress, the cross-section of the cylinder segment after welding will appear elliptical, which will cause difficulties in the butt welding of different cylinder segments. The misalignment of the circumferential welds of the upper and lower cylinder segments often exceeds the specified standard. Especially during the welding of the circumferential welds, the deformation of the tank body will be aggravated, making it impossible to install the prefabricated internal parts of the circular vertical tank equipment, or the accuracy after installation cannot meet the design requirements, affecting the overall performance of the equipment.

[0004] At present, the correction method used on site for the deformation of large steel circular vertical tanks during construction is to use a long-rod jack, which is time-consuming and unsafe. Patent CN 103273252 A "A pre-welding shaping aid and welding method for large steel cylinders" invented a set of equipment for limiting welding deformation and a matching welding construction method, which requires a welding platform, a fixed column, a slideway, an external lead screw, an outer arc positioning block, an inner push rod, etc., and the deformed outer circle of the cylinder is shaped by adjusting the rigid constraint position. The lead screw, the seam width adjustment positioning wedge, the process support, etc. are used to ensure the cylinder forming accuracy, and a strict cylinder welding process needs to be formulated. This invention requires large and complex tooling equipment, which is expensive and complicated to operate; Patent CN 203592241 U "A tooling device for adjusting the roundness of large-diameter equipment" invented a tooling device for adjusting the roundness of large-diameter equipment. The device consists of a large-diameter external clamping ring tooling body, a reinforcement plate, bolts, a guide chain, a connecting plate and a lifting lug. The outer clamping ring fixture body cannot be used for tanks of different diameters, and its versatility is not only poor, but also the cost is high; Patent CN 208034021 U "Anti-deformation device for steel thin-walled cylinder", the invention consists of a central circular plate and an anti-deformation support. The center of the central circular plate needs to coincide with the center of the cylinder, and the anti-deformation support is evenly arranged along the circumference of the central circular plate. The device needs to coincide with the center of the cylinder, otherwise the equipment will be deformed, which is difficult in itself, but it is suitable for cylindrical equipment to prevent deformation of the cylinder during transportation and hoisting; Patent CN 204504638 U "Deformation control fixture for welding of thin-walled circular well-type stainless steel cylinders", invented a thin-walled stainless steel cylinder inflation protection welding anti-deformation fixture. It is mainly used to control the deformation of the weld area of ​​the thin-walled plate during welding. The thermal stress generated by the welding of medium and thick plates is large, and the rigidity of the steel plate with grooves in the fixture cannot meet the requirements.

[0005] To this end, the applicant has invented a large-scale steel vertical circular equipment on-site construction roundness control tooling. It is simple to make, can be processed and made using the remaining materials in the production process, can be reused, and has a low cost; it is simple and fast to assemble on site, and does not require special tools and equipment; it has strong rigidity, and can effectively control the roundness of the tank through multi-point pre-constraints, meet the precise positioning function, and solve the impact of the deformation of the tank after on-site welding on the installation of prefabricated internal parts. Summary of the invention

[0006] The purpose of the present invention is to provide a tool for controlling roundness of large-scale steel vertical circular equipment on-site construction and its application method, which mainly solves the problems existing in the measures adopted by the existing large-scale steel vertical tank on-site construction to control roundness deformation. It is simple and fast to install; it can use the remaining materials in the production process, and the cost is low; it can be reused; through multi-point rigid constraints, the roundness control accuracy is high.

[0007] In order to achieve the above object, the present invention is achieved as follows:

[0008] A roundness control tool for a steel vertical tank, comprising a cylinder section that needs to be manufactured on site, wherein a vertical center positioning support is provided in the cylinder section, and both ends of the center positioning support are connected to the inner wall of the cylinder section through at least four control rods, and the height of the center positioning support matches that of the cylinder section;

[0009] The central positioning support member includes two sets of positioning connection plates, the two sets of positioning connection plates are connected by column steel pipes, and the center of the column steel pipe is the same as that of the positioning connection plate;

[0010] The control rod includes a universal control rod and a special control rod. One end of the universal control rod is connected to the positioning connection plate, and the other end of the universal control rod is connected to one end of the special control rod 3. The other end of the special control rod 3 is welded to the inner wall of the cylinder section.

[0011] Preferably, one end of the column steel pipe is connected to a group of positioning connection plates, and the other end of the column steel pipe passes through another group of connection plates and is connected to the column pad.

[0012] Preferably, the two groups of positioning connection plates on the column steel pipe are respectively connected to the inner wall of the cylinder segment through at least four control rods, and the upper and lower layers of control rods connected to the two groups of positioning connection plates are parallel to each other, and the control rods connected to each group of positioning connection plates are radially arranged at equal angles in the cylinder segment with the center of the cylinder segment.

[0013] Preferably, the upper and lower layers of mutually parallel control rods are connected via a roundness rod support member, and the roundness rod support member is vertically arranged between the parallel control rods for supporting the control rods.

[0014] Preferably, the roundness tie rod support component includes a main body component, and the two ends of the main body component adopt a stud body structure. The mutually parallel universal control rod and the special control rod are respectively provided with reserved connecting holes, and the hole diameter of the reserved connecting hole matches the outer diameter of the stud body. The stud bodies at both ends of the roundness tie rod support component are respectively connected to the mutually parallel control rods through the connecting holes on the universal control rod and the special control rod, and the horizontality of the universal control rod and the special control rod are adjusted by bolts.

[0015] Preferably, a plurality of holes are preset on the positioning connection disk, and the holes are opened at the same fillet of two concentric circles of the positioning connection disk, and one end of the universal control rod is connected to the positioning connection disk through the holes.

[0016] Preferably, the adjacent control rods are connected via a stabilizing cross bar.

[0017] Preferably, the overall height of the center positioning support is the same as the height of the barrel section.

[0018] The present invention also provides an application method of a roundness control tool for a steel vertical tank, the steps of which are as follows:

[0019] Step 1: Stand up four rolled tank body plates to form a cylinder section to be welded, and spot weld the four cluster welds between the four tank body plates to form a preliminary cylinder section;

[0020] Step 2: Assemble the center positioning support and the control rod in the cylinder section, and adjust the position of the center positioning support so that the two sets of positioning connection plates-connected control rods are both in the wall plate of the cylinder section, and adjust the bolts at the ends of the rod support to ensure that the control rods of the upper and lower layers are in a straight state;

[0021] Step 3: Weld and fix one end of the roundness control rod to the inner wall of the tank body vertical plate of the cylinder section;

[0022] Step 4: Weld the cluster welds on the cylinder of the cylinder section;

[0023] Step 5: After all welds are welded, remove the special control rod and lift the whole cylinder section with a mast or lifting equipment;

[0024] Step 6: Complete the welding of the cluster welds of the second uppermost cylinder section of the tank body according to the procedures of Step 1 to Step 4, and weld the circumferential weld between the two cylinder sections. Then, remove the special control rod and lift the upper two cylinder sections with a mast or lifting equipment;

[0025] Step 7: Follow steps 1 to 6 until all the tank body segment vertical plate cluster welds and the circumferential welds between them are completed, and then remove the remaining center positioning supports and control rods.

[0026] The present invention has the following advantages:

[0027] 1. The present invention provides a large-scale steel vertical circular equipment on-site construction roundness control tooling, the components of which can be processed in the factory, the accuracy can be guaranteed, and it can be assembled on-site and transported conveniently.

[0028] 2. The roundness control tooling of the present invention can use the leftover materials from the factory processing process, not limited to a specific material. The control rod and the stabilizing cross bar can be any steel section, and the positioning connection plate for positioning the control rod can be spliced ​​together with steel plates of any thickness (the thickness depends on the requirements of the connection stiffness), which is low in cost.

[0029] 3. The tooling center positioning support and universal control rod of the present invention can be reused in equipment with different tank diameters.

[0030] 4. The welding of the control rod on the tooling of the present invention and the inner surface of the cylinder segment wall plate forms a rigid constraint, and multiple control rods constrain or restrict each other to ensure that the roundness of the tank body or cylinder segment meets the design accuracy requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the top view of the roundness control tooling for a steel vertical tank provided by the present invention;

[0032] Figure 2 It is a front view structural schematic diagram of a roundness control tooling for a steel vertical tank provided by the present invention;

[0033] Figure 3 It is a structural schematic diagram of a center positioning support in a roundness control tooling for a steel vertical tank provided by the present invention;

[0034] Figure 4 It is a structural schematic diagram of a roundness tie rod support member in a roundness control tooling of a steel vertical tank provided by the present invention;

[0035] Figure 5 The present invention is a schematic diagram of a top view of a positioning connection plate in a roundness control tooling for a steel vertical tank.

[0036] The serial numbers in the figure are as follows:

[0037] 1. Center positioning support; 1-1. Column steel pipe; 1-2. Positioning connection plate; 1-3. Column pad; 2. Universal control rod; 3. Special control rod; 4. Fasteners; 5. Roundness rod support; 6. Stabilizing cross bar; 7. Tank body plate. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0039] like Figures 1 to 5 As shown, a roundness control tool for a steel vertical tank disclosed in the present invention is a roundness control tool for on-site construction of large steel vertical circular equipment, comprising a cylinder segment surrounded by four or more rolled tank body vertical plates 7, the four tank body vertical plates 7 being welded by cluster welds; a center positioning support 1 is vertically installed at the center of the cylinder segment, and the center positioning support 1 matches the height of the cylinder segment;

[0040] The central positioning support 1 includes a column steel pipe 1-1 and two groups of positioning connection plates 1-2, each of the two ends of the column steel pipe 1-1 is provided with a group of positioning connection plates 1-2, and the center of the column steel pipe 1-1 and the positioning connection plates 1-2 are the same; the two groups of positioning connection plates 1-2 on the column steel pipe 1-1 are respectively connected to the inner wall of the circumference of the cylinder segment through eight control rods, the control rods connected to the two groups of positioning connection plates 1-2 on the column steel pipe 1-1 are parallel to each other, and the control rods connected to each group of positioning connection plates 1-2 are radially arranged in the cylinder segment at equal angles with the center of the cylinder segment.

[0041] The control rod includes a universal control rod 2 and a special control rod 3. One end of the universal control rod 2 is connected to the positioning connection plate 1-2 through a fastener 4, and the other end of the universal control rod 2 is connected to one end of the special control rod 3. The other end of the special control rod 3 is welded to the inner wall of the cylinder section.

[0042] Furthermore, in order to support the control rod, a roundness rod support member 5 is vertically installed between the upper and lower parallel control rods, and the roundness rod support member 5 plays a role of supporting the control rod.

[0043] Furthermore, in order to ensure that the control rod is stably connected to the roundness rod support 5, the roundness rod support 5 includes a main body, and both ends of the main body adopt a stud body structure. The mutually parallel universal control rod 2 and the special control rod 3 are respectively provided with reserved connecting holes, and the hole diameter of the reserved connecting hole matches the outer diameter of the stud body. The stud bodies at both ends of the roundness rod support 5 respectively pass through the connecting holes on the universal control rod 2 and the special control rod 3 and are connected to the mutually parallel control rods by bolts, and the horizontality of the universal control rod 2 and the special control rod 3 is adjusted by bolts.

[0044] Furthermore, the control rods connected to each set of positioning connection plates 1 - 2 , ie, the adjacent control rods in the same plane, are connected via a stabilizing cross bar 6 .

[0045] Furthermore, in order to stack multiple cylinder segments in the tank body, one end of the column steel pipe 1-1 of the present invention is connected to a group of positioning connecting plates 1-2, and the other end of the column steel pipe 1-1 passes through another group of connecting plates 1-2 and is connected to the column pad 1-3, so that multiple cylinder segments can be stably stacked through the column pad 1-3, and gaps are left for the control pull rods on the multiple cylinder segments to achieve stable stacking.

[0046] Furthermore, according to the different tank diameters, two circles of holes with the same diameter are evenly distributed on the two concentric circles of the positioning connection plate 1-2, the center of the concentric circle coincides with the center of the column steel pipe 1-1, the orientation of the two circles of holes has the same fillet, and the holes serve as bolt holes for fixing the universal control pull rod, which is fixed by fasteners 4.

[0047] If the roundness of a certain cylinder section of the circular vertical tank equipment to be manufactured needs to be strictly controlled, it is only necessary to use the roundness control tooling of the present invention when constructing the cylinder section of this section.

[0048] The roundness control tool of the present invention is processed in the factory according to the width or height of the prefabricated vertical plate (wall plate) of the tank body during on-site construction, and then transported to the site with the prefabricated vertical plate (which has been rolled in blocks according to the arc of the specified tank body diameter) in the factory, and assembled on site. The specific implementation steps are as follows:

[0049] Step 1: four or more rolled tank body vertical plates 7 are erected to form a cylinder section to be welded, and four or more cluster welds between the four or more tank body vertical plates 7 are spot welded to form a preliminary cylinder section;

[0050] Step 2: Assemble the center positioning support 1 and the control rod in the cylinder section, and adjust the position of the center positioning support 1 so that the control rods connected by the two sets of positioning connection plates 1-2 are both in the wall plate of the cylinder section, and adjust the bolts on the threaded body of the rod support 5 to ensure that the control rods of the two layers parallel to each other are both in a straight state;

[0051] Step 3: Weld one end of the special control rod 3 to the inner wall of the tank body vertical plate 7 of the cylinder section (preferably by intermittent welding);

[0052] Step 4: Weld the cluster welds on the cylinder of the cylinder segment (including reinforcing ribs or rings);

[0053] Step 5: After all welds are welded, remove the special control rod 3 and use a mast (or lifting equipment) to lift the entire cylinder section;

[0054] Step 6: Complete the welding of the second cylinder section cluster weld at the top of the tank body according to the procedures of steps 1 to 4, and weld the girth weld between the two cylinder sections;

[0055] Then, remove the special control tie rod 3 and use the mast (or lifting equipment) to lift the upper two cylinder sections;

[0056] Step 7: Use steps 1 to 6 until all the cluster welds of the tank body vertical plates 7 in the tank body and the circumferential welds between them are welded, and then remove the remaining center positioning support member 1 and the control rod.

[0057] The present invention has the following advantages:

[0058] 1. The present invention provides a large-scale steel vertical circular equipment on-site construction roundness control tooling, the components of which can be processed in the factory, the accuracy can be guaranteed, and it can be assembled on-site and transported conveniently.

[0059] 2. The roundness control tooling of the present invention can use the leftover materials from the factory processing process, not limited to a specific material. The control rod and the stabilizing cross bar can be any steel section, and the positioning connection plate for positioning the control rod can be spliced ​​with steel plates of any thickness, which is low in cost.

[0060] 3. The tooling center positioning support and universal control rod of the present invention can be reused in equipment with different tank diameters.

[0061] 4. The welding of the control rod on the tooling of the present invention and the inner surface of the cylinder segment wall plate forms a rigid constraint, and multiple control rods constrain or restrict each other to ensure that the roundness of the tank body or cylinder segment meets the design accuracy requirements.

[0062] Example 1

[0063] The inner diameter of the steel circular vertical tank is 7000mm, the straight side height of the tank is 5600mm, the thickness of the steel plate used is 10mm, and it needs to be welded on site.

[0064] Step 1: According to the straight edge height of the tank body, a plate with a width of 1800mm and a thickness of 10mm can be selected to open the plate, and three circles of cylinder sections can be welded together to form the shape; according to the inner diameter of the tank body, it can be concluded that the length of the steel plate required for each cylinder section is 21980mm. Considering the rationality and economy of packaging and transportation, as well as the workload of welding construction, each circle is formed by prefabricating 4 pieces of steel plates in the factory (beveling, surface sandblasting and rolling). The bow length of each steel plate after rolling is 4950mm, and the bow height is 1025mm, with a total of 3x4=12 pieces. Then load the mold, which will be shipped to the site together with the roundness control tooling;

[0065] Step 2: According to the selected plate width, make a universal center positioning support with a total height of 1700mm. The column steel pipe is made of Processing 2 pieces Tie rod positioning connection plate, thickness is 10-15mm, with a center opening The holes are used to fix the central column steel pipe and and On the circumference of the concentric circle, drill at an angle of 45 degrees There are 16 pieces in total. Fix them on the central column steel pipe, with the top piece flush with the top of the pipe and the bottom piece 100mm or more above the ground;

[0066] Step 3: The diameter of the tank in this example is only 7000mm, and 4 evenly distributed control rods can basically meet the requirements for each layer. If the precision requirement is high, 8 control rods can be used. The control rods in this example are 60x40 rectangular steel pipes. 8 steel pipes with a length of 2400mm are cut, and a hole is drilled at 50mm and 100mm at each end of each prefabricated steel pipe. The hole is then made, and the universal control rod is completed;

[0067] Step 3: Make the special control rod 2. Use the same material as the general control rod. Cut 8 steel pipes with a length of 2150mm-1mm, and drill 50mm and 100mm at one end of each pipe. A hole is drilled at the other end of each of them at a position 300 to 500 mm from the end. Hole, that's it. Production of a special control rod 2 for the tank body;

[0068] Step 4: Make the tie rod support 5. Cut 8 sections of 1500mm long 60x40 rectangular steel pipes, and weld a section of M16 screw at the same angle at both ends of the inner side of the steel pipe. The length of the screw exposed from the rectangular steel pipe is about 180mm. If the M16 screw is rigid enough, 8 1800mm long screws can be used instead;

[0069] Step 5: Stand up 4 rolled tank wall (vertical) plates to form a cylinder section to be welded, and spot weld 4 cluster welds;

[0070] Step 6: Assemble the center positioning support 1 and the control rods in the cylinder section, and move the center positioning support 1 at the same time until all the dedicated control rods 3 fall into the cylinder section and are in a straight state;

[0071] Step 7: Weld the free ends of the eight special control rods 3 to the cylinder section wall plate, preferably by spot welding or intermittent welding;

[0072] Step 8: According to the welding construction process, complete the welding of all 4 cluster welds on the cylinder section and the specified reinforcement ribs;

[0073] Step 9: Remove all the dedicated control rods 3 and lift the uppermost cylinder section by the mast lifting device;

[0074] Step 10: Fabrication and assembly of the second cylinder segment. Complete the cluster weld construction of the second cylinder segment according to the procedures of steps 5 to 8, and then weld the girth weld between the two cylinder segments;

[0075] Step 11: After the assembly welding is completed, all the special control rods 3 are removed, and the two welded cylinder sections are hoisted by the mast lifting device;

[0076] Step 12: Fabrication and assembly of the third cylinder segment. The same process as step 9 is used to complete the construction of the cluster weld and girth weld of the third cylinder segment. After all welding is completed, the roundness control tooling is removed and the Welding work on the tank wall.

[0077] If the reuse of tooling is not considered, the universal control rod and the special rod can be made of a whole piece of material; if it is possible to use steel plates of different widths, the central column steel pipe can be in a telescopic and height-adjustable form.

[0078] Example 2

[0079] The inner diameter of the steel circular vertical tank is 15000mm, the straight side height of the tank is 3800mm, the thickness of the steel plate used is 12mm, and the upper outer wall of the tank needs to be reinforced with a full circle of 10# channel steel and welded on site, but only the roundness of the uppermost cylinder is required.

[0080] Step 1: According to the total straight edge height of the tank body, two circles of open plates with different steel plate widths can be used. The upper circle cylinder section plate width is 1800mm, and the bottom circle plate width is 2000mm. Each circle is rolled into 6 pieces of arched plates with an inner diameter of 15000mm, each arch length is 7500mm (the unfolded plate length is 7850mm), and the arch height is 1005mm. Roll 8 sections of 10# channel steel reinforcement rings with an inner diameter of 15024mm, an arch length of 5749mm (the unfolded length is 5900mm), and an arch height of 572mm.

[0081] Step 2: The center positioning support and universal control rod of the roundness control tool are the same as step 2 and step 3 in embodiment 1. Since this embodiment only requires the roundness of the upper edge of the tank body to be controlled, a single layer of control rods can be used to meet the requirement, and the tank body has a relatively large diameter, so the number of control rods is 8 (single-layer arrangement);

[0082] Step 3: The number of control rod support members is 24, and the method is the same as step 4 of embodiment 1, but only single-end screw rod is made;

[0083] Step 4: Production of special control rod: Cut 8 rectangular steel pipes with a length of 5150mm and a specification of 60x50, and drill two holes at 50mm and 100mm at one end of each pipe. Drill another hole at 300-500mm from the other end and in the middle. Through holes, 4 holes in total for each rod, special control rods are made;

[0084] Step 5: The construction of the upper ring cylinder segment and the installation of the roundness control tooling are the same as in Example 1;

[0085] Step 6: After the welding of the six cluster welds between the upper tank body vertical plates 7 and the outer reinforcement ring on the upper edge is completed, the roundness control tooling is removed.

[0086] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the construction field who makes equivalent replacements or changes according to the technical measures and inventive concepts of the present invention within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A roundness control tool for a steel vertical tank. It is characterized in that It comprises a cylinder section that needs to be manufactured on site, wherein a vertical center positioning support (1) is provided inside the cylinder section, and the two ends of the center positioning support (1) are connected to the inner wall of the cylinder section through at least four control rods, and the center positioning support (1) matches the height of the cylinder section; The central positioning support (1) comprises two groups of positioning connection plates (1-2), the two groups of positioning connection plates (1-2) are connected via a column steel pipe (1-1), and the center of the column steel pipe (1-1) and the positioning connection plate (1-2) are the same; The control rod comprises a universal control rod (2) and a special control rod (3), one end of the universal control rod (2) is connected to the positioning connection plate (1-2), the other end of the universal control rod (2) is connected to one end of the special control rod (3), and the other end of the special control rod (3) is welded to the inner wall of the cylinder section; One end of the column steel pipe (1-1) is connected to a group of positioning connection plates (1-2), and the other end of the column steel pipe (1-1) passes through another group of positioning connection plates (1-2) and is connected to the column pad (1-3), so that multiple cylinder sections can be stably stacked through the column pad (1-3), and gaps are left for control pull rods on the multiple cylinder sections, thereby achieving stable stacking; The two groups of positioning connection plates (1-2) on the column steel pipe (1-1) are respectively connected to the inner wall of the cylinder segment through at least four control rods, and the upper and lower layers of the control rods connected to the two groups of positioning connection plates (1-2) are parallel to each other, and the control rods connected to each group of positioning connection plates (1-2) are radially arranged in the cylinder segment at equal angles from the center of the cylinder segment; The upper and lower layers of mutually parallel control rods are connected via a roundness rod support member (5), and the roundness rod support member (5) is vertically arranged between the parallel control rods and is used to support the control rods; The roundness rod support member (5) comprises a main body, the two ends of which adopt a stud body structure, the mutually parallel universal control rod (2) and the special control rod (3) are respectively provided with reserved connection holes, and the diameter of the reserved connection holes matches the outer diameter of the stud body, the stud bodies at both ends of the roundness rod support member (5) are respectively connected to the mutually parallel control rods through the connection holes on the universal control rod (2) and the special control rod (3), and the horizontality of the universal control rod (2) and the special control rod (3) is adjusted by bolts.

2. A roundness control tool for a steel vertical tank according to claim 1, It is characterized in that The positioning connection disk (1-2) is preset with a plurality of holes, the holes being opened at the same fillet of two concentric circles of the positioning connection disk (1-2), and one end of the universal control pull rod (2) is connected to the positioning connection disk (1-2) through the holes.

3. The roundness control tool for a steel vertical tank according to claim 1, It is characterized in that Adjacent control pull rods are connected via a stabilizing cross bar (6).

4. The roundness control tool for a steel vertical tank according to claim 1, It is characterized in that The total height of the central positioning support (1) is the same as the height of the cylinder section.

5. An application method of the roundness control tooling for a steel vertical tank as claimed in claim 1, 2, 3 or 4, It is characterized in that Here are the steps: Step 1: four or more rolled tank body upright plates (7) are erected to form a cylinder section to be welded, and four or more cluster weld seams between the four or more tank body upright plates (7) are spot welded to form a preliminary cylinder section; Step 2: Assemble the center positioning support (1) and the control rod in the cylinder section, and adjust the position of the center positioning support (1) so that the control rods connected by the two sets of positioning connection plates (1-2) are both in the wall plate of the cylinder section, and adjust the bolts at the ends of the roundness rod support (5) to ensure that the control rods of the upper and lower layers are in a straight state; Step 3: Weld and fix one end of the roundness control rod (3) to the inner wall of the tank body vertical plate (7) of the cylinder section; Step 4: Weld the cluster welds on the cylinder of the cylinder section; Step 5: After all welds are welded, remove the special control rod (3) and lift the entire barrel section with a mast or lifting equipment; Step 6: Complete the welding of the cluster welds of the second uppermost cylinder section of the tank body according to the procedures of steps 1 to 4, and weld the circumferential weld between the two cylinder sections; then, remove the special control rod (3), and lift the upper two cylinder sections with a mast or lifting equipment; Step 7: Steps 1 to 6 are followed until the cluster welds of all the cylinder segment plates (7) of the tank body and the circumferential welds between them are welded, and then the remaining center positioning support (1) and control rods are removed.

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