A method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding.

Abstract

This invention discloses a method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding, comprising the following steps: S1, dividing the support cylinders into layers and groups; S2, installing the first layer of support cylinders: welding the welds at both ends of the horizontal ring beam between two adjacent beam connectors at the top of the first layer of support cylinders, welding the welds at both ends of the two longitudinal support beams between each V-shaped transition piece of the first group and the corresponding two beam connectors at the top of the first layer of support cylinders, while leaving the welds at both ends of the longitudinal support beams between the V-shaped transition pieces of the second group and the corresponding beam connectors at the top of the first layer of support cylinders unwelded; S3, installing the second layer of support cylinders: welding the welds at both ends of the horizontal ring beam between two adjacent beam connectors at the top of the second layer of support cylinders, welding the welds at both ends of one group of longitudinal support beams in two adjacent groups of longitudinal support beams in the second layer of support cylinders, while leaving the welds at both ends of the other group of longitudinal support beams unwelded.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding. Background Technology

[0002] Roof steel structures typically employ three-dimensional grid single-layer reticulated shell steel structures. Traditional three-dimensional grid single-layer reticulated shell steel structures are mostly used for flat roofs, offering relatively simple support. However, the roof design of a large museum project was complex, featuring a curved surface with significant vertical movement. The support points at the top might not be on the same horizontal plane, making support more challenging and posing numerous safety hazards with traditional support methods. Therefore, this project designed an irregularly shaped support tube structure to support the large-span, irregularly shaped three-dimensional grid single-layer reticulated shell roof. However, due to the irregular shape of this support tube, its symmetrical structure, and large span, welding construction was difficult, and the installation method and welding quality of the support tube directly affected the overall construction progress and quality of the project. Summary of the Invention

[0003] The purpose of this invention is to provide a method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides a method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding. The support cylinder has a multi-layer structure, with multiple V-shaped transition pieces at the bottom. Multiple beam connectors are evenly spaced at the top of each layer. The beam connectors of adjacent layers are arranged in a triangular staggered pattern and are connected by longitudinal support beams. The two adjacent beam connectors of each layer are connected by horizontal ring beams to form a ring structure. The bottom of the V-shaped transition pieces is installed on the support structure.

[0005] A method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding includes the following steps:

[0006] S1. Divide the support cylinder into layers and groups. Among them, the multiple V-shaped conversion parts are divided into two groups by skipping one and selecting one. The two longitudinal support beams between one beam connector at the top of the lower layer support cylinder and two beam connectors at the top of the upper layer support cylinder are divided into one group. The two longitudinal support beams in each group are arranged in a V-shape.

[0007] S2. Installation of the first layer support tube: Weld the welds at both ends of the horizontal ring beam between the two adjacent beam connectors at the top of the first layer support tube, weld the welds at both ends of the two longitudinal support beams between each V-shaped conversion piece of the first group and the two corresponding beam connectors at the top of the first layer support tube, and do not weld the welds at both ends of the longitudinal support beams between the V-shaped conversion pieces of the second group and the corresponding beam connectors at the top of the first layer support tube, so that the first layer support tube forms a temporary stable structure.

[0008] S3. Installation of the second-layer support tube: Weld the welds at both ends of the horizontal ring beam between the two adjacent beam connectors at the top of the second-layer support tube, weld the welds at both ends of one set of longitudinal support beams in the two adjacent sets of longitudinal support beams of the second-layer support tube, while leaving the welds at both ends of the other set of longitudinal support beams unwelded, so that the second-layer support tube forms a temporary stable structure.

[0009] In a preferred embodiment, the method further includes: S4, installation of the third-layer support tube: welding the welds at both ends of the horizontal ring beam between two adjacent beam connectors at the top of the third-layer support tube, welding the welds at both ends of one set of longitudinal support beams in two adjacent sets of longitudinal support beams of the third-layer support tube, and leaving the welds at both ends of the other set of longitudinal support beams unwelded, so that the third-layer support tube forms a temporary stable structure; S5, installation of the fourth-layer support tube and the upper-layer support tube: repeating steps S2 to S4 to complete the installation of the components of the subsequent support tube layers until the core tube construction is completed.

[0010] In a preferred embodiment, when the first layer of support cylinder is installed, the top of the weld seams at both ends of the horizontal ring beam between the two adjacent beam connectors at the top of the first layer of support cylinder is completed, and the weld seams at both ends of the two longitudinal support beams between each V-shaped conversion piece of the first group and the two beam connectors above it are welded to 30% of the total thickness. At the same time, the second layer of support cylinder is hoisted.

[0011] In a preferred embodiment, when the second layer support cylinder is installed, the welds at both ends of the horizontal ring beam between two adjacent beam connectors at the top of the second layer support cylinder are completed, and the welds at both ends of one set of longitudinal support beams in one of the two sets of adjacent longitudinal support beams of the second layer support cylinder are welded to 30% of the total thickness. At the same time, the third layer support cylinder is hoisted and the remaining welds of the first layer support cylinder are welded, so that all welds of the first layer support cylinder are completed before the third layer support cylinder is installed.

[0012] In a preferred embodiment, when the third layer of support cylinder is installed, the remaining welds of the second layer of support cylinder are welded, and all welds of the second layer of support cylinder are completed before the fourth layer of support cylinder is installed.

[0013] In a preferred embodiment, the overall welding sequence of the support cylinder is as follows: the plane is welded simultaneously using the partitioned back-welding method, and the vertical surface is welded from bottom to top; the welding method of the longitudinal support beam is as follows: when there are two weld joints in one direction for a single longitudinal support beam, the weld joint at one end is welded first, and then the weld joint at the other end is welded, and the two longitudinal support beams on both sides of the same beam connector are welded simultaneously.

[0014] In a preferred embodiment, the beam connector includes: a first insert plate, a second insert plate, a support beam connector, and a ring beam connector; the first insert plate and the second insert plate have a cross structure; there are two ring beam connectors, which are respectively disposed on both sides of the first insert plate; one end of the ring beam connector is provided with a notch, the second insert plate is inserted into the notch, and both the first insert plate and the second insert plate are fixedly connected to the ring beam connector, and the other end of the ring beam connector is connected to a horizontal ring beam; there are four support beam connectors, which are respectively disposed on the outer sides of the four corners of the connection between the first insert plate and the second insert plate, and both the first insert plate and the ring beam connector are connected to one end of the support beam connector, and the other end of the support beam connector is respectively connected to the lower or lower longitudinal support beam.

[0015] In a preferred embodiment, the top of the support tube is connected to the roof mesh shell using a one-piece cast steel node. The cast steel node includes multiple one-piece cast connection parts. The multiple connection parts are not in the same vertical plane. The end of the connection part is welded to the longitudinal support beam of the support tube with a single-sided V-shaped bevel with an opening angle of 35°, and a double-lined reinforced ring structure is adopted.

[0016] In a preferred embodiment, when the support tube is constructed to the opening section where it intersects with the roof grid shell at the top, two angle steels and the already installed support tube structure are used for connection. After all the support tubes are welded, the angle steels are removed. The opening section at the top of the support tube extends upward and outward along the perimeter of the support tube, and the inclination of the opening section matches the inclination of the downward extending structure at the roof steel structure.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The installation of irregularly shaped, large-span support tubes in this invention affects the overall construction progress of large-span steel roofs, and consequently impacts the construction progress of subsequent curtain wall projects, roof PTFE membrane structure projects, and grass slope structures. To accelerate the installation and welding progress of the support tubes, this invention innovatively adopts a vertical layered cyclic skip welding technology, and follows the principles of "unified symmetry, zoned construction; single-rod double welding, double-rod single welding" during welding, thereby significantly improving construction efficiency and ensuring construction quality. Furthermore, for sections with large deflection angles and spans, such as the top connection of the support tube, an innovative one-time forming technology for irregularly shaped curved steel structure nodes is adopted. Utilizing the high strength and one-time casting characteristics of cast steel components, effective butt joint connections are perfectly achieved for sections with large deflection angles and spans. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the connection structure between the support tube and the roof structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the support cylinder structure of the present invention;

[0021] Figure 3 This is a first structural schematic diagram of the beam connector node of the present invention;

[0022] Figure 4 This is a schematic diagram of the second structure of the beam connector node of the present invention;

[0023] Figure 5 This is a schematic diagram of the V-shaped conversion component mounting structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the unfolded segmentation of the support cylinder of the present invention;

[0025] Figure 7 This is a schematic diagram of the installation of the first layer support cylinder of the present invention;

[0026] Figure 8 This is a schematic diagram of the installation of the second layer support cylinder of the present invention;

[0027] Figure 9 This is a schematic diagram of the installation of the third layer support cylinder of the present invention;

[0028] Figure 10 This is a schematic diagram of the single-rod double welding of the present invention;

[0029] Figure 11 This is a schematic diagram of the double-rod single-welding of the present invention;

[0030] Figure 12 This is a schematic diagram of the partitioned back-soldering method of the present invention;

[0031] Figure 13 This is a model diagram of the cast steel component node of the present invention;

[0032] Figure 14 This is a schematic diagram of the double-liner reinforced ring structure of the present invention;

[0033] Figure 15 for Figure 14 Enlarged view of a portion of point A in the middle;

[0034] Figure 16 for Figure 14 A cross-sectional view along the BB direction;

[0035] Figure 17 This is a schematic diagram of the downward extension structure at the roof steel structure of the present invention;

[0036] Figure 18 This is a flowchart of the method of the present invention. Detailed Implementation

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0038] Example 1:

[0039] like Figures 1 to 18 As shown, this invention takes a large-span irregular three-dimensional grid single-layer shell roof structure construction project as an example. At the predetermined support position, a downward extension structure 103 is made at the roof steel structure 101. The inclination of the downward extension structure 103 matches the inclination of the topmost flower structure of the support tube 102, thereby connecting the roof steel structure 101 and its bottom support tube into a whole.

[0040] The support cylinder 102 has a multi-layer structure. The bottom of the support cylinder 102 is provided with multiple V-shaped conversion parts 1. Multiple beam connectors 2 are evenly spaced at the top of each layer. The beam connectors 2 of adjacent layers are arranged in a triangular staggered manner, and the beam connectors 2 of adjacent layers are connected by longitudinal support beams 3. The two adjacent beam connectors 2 of each layer are connected by horizontal ring beams 4 to form a ring structure. The bottom of the V-shaped conversion parts 1 is installed on the support structure 10.

[0041] The beam connector 2 includes: a first insert plate 21, a second insert plate 22, a support beam connector 23, and a ring beam connector 24; the first insert plate 21 and the second insert plate 22 have a cross structure; there are two ring beam connectors 24, which are respectively located on both sides of the first insert plate 21; one end of the ring beam connector 24 is provided with a notch, the second insert plate 22 is inserted into the notch, and both the first insert plate 21 and the second insert plate 22 are fixedly connected to the ring beam connector 24, and the other end of the ring beam connector 24 is connected to the horizontal ring beam 4; there are four support beam connectors 23, which are respectively located on the outer side of the four corners of the connection between the first insert plate 21 and the second insert plate 22, and both the first insert plate 21 and the ring beam connector 24 are connected to one end of the support beam connector 23, and the other end of the support beam connector 23 is respectively connected to the lower or lower longitudinal support beam 3. The ring beam connector 24 is provided with an inner reinforcing plate 25 on the inner side of the connection position with the support beam connector 23, and an outer reinforcing plate 26 is provided on the outer side of the connection position between the ring beam connector 24 and the horizontal ring beam 4 and the outer side of the connection position between the support beam connector 23 and the longitudinal support beam 3.

[0042] In this embodiment, each support tube has six V-shaped transition pieces 1 at its bottom connected to the main structure. Each layer consists of 18 steel components and 144 welds. The installation of the support tube affects the construction progress of the large-span irregular three-dimensional grid single-layer reticulated roof structure, which in turn affects the construction progress of subsequent curtain wall projects, roof PTFE membrane structure projects, and grass slope structures. The structural design of the support tube allows the beam connectors 2 of different layers to be connected by longitudinal support beams 3. In actual construction, only the length and angle of the longitudinal support beams need to be changed to meet the support requirements of roof steel structures of different heights, solving the problem of the difficulty of supporting structures where the support points are not on the same horizontal plane.

[0043] Example 2:

[0044] To expedite the installation and welding progress of the support cylinder, this invention proposes a layered skip welding method to prevent deformation of irregularly shaped, large-span support cylinders, comprising the following steps:

[0045] Step S1: Divide the support cylinder into layers and groups. For example... Figures 6 to 9 As shown, the six V-shaped conversion parts 1 at the bottom of the support cylinder are divided into two groups by skipping one and selecting one. The two longitudinal support beams 3 between one beam connector 2 at the top of the lower support cylinder and the two beam connectors 2 at the top of the upper support cylinder are divided into a group, and the two longitudinal support beams 3 in each group are arranged in a V-shape.

[0046] Step S2, First-layer support tube installation: Weld the welds at both ends of the horizontal ring beam 4 between two adjacent beam connectors 2 at the top of the first-layer support tube, and weld the welds at both ends of the two longitudinal support beams 3 between each V-shaped conversion piece 1 of the first group and the two corresponding beam connectors 2 at the top of the first-layer support tube. However, do not weld the welds at both ends of the longitudinal support beams 3 between the V-shaped conversion piece 1 of the second group and the corresponding beam connectors 2 at the top of the first-layer support tube, so that the first-layer support tube forms a temporary stable structure.

[0047] Step S3, Installation of the second layer support tube: Weld the welds at both ends of the horizontal ring beam 4 between the two adjacent beam connectors 2 at the top of the second layer support tube, weld the welds at both ends of one set of longitudinal support beams 3 in the two adjacent sets of longitudinal support beams 3 of the second layer support tube, while leaving the welds at both ends of the other set of longitudinal support beams 3 unwelded, so that the second layer support tube forms a temporary stable structure.

[0048] Step S4, Installation of the third layer support tube: After completing the welding of the two ends of the horizontal ring beam 4 between the two adjacent beam connectors 2 at the top of the third layer support tube, weld the two ends of one set of longitudinal support beams 3 of the two adjacent sets of longitudinal support beams 3 of the third layer support tube, and do not weld the two ends of the other set of longitudinal support beams 3, so that the third layer support tube forms a temporary stable structure.

[0049] Step S5, Installation of the fourth layer support tube and the upper layer support tube: Repeat steps S2 to S4 to complete the installation of the components of the subsequent support tube layers until the core tube construction is completed.

[0050] Specifically, during the installation of the first layer of support cylinder, the top of the welds at both ends of the horizontal ring beam 4 between two adjacent beam connectors 2 at the top of the first layer of support cylinder is welded, and the welds at both ends of the two longitudinal support beams 3 between each V-shaped transition piece 1 of the first group and its corresponding two beam connectors 2 above it are welded to 30% of the total thickness (e.g., Figure 7 (As shown by the blue longitudinal support beam), and the welds at both ends of the longitudinal support beam 3 between the second set of V-shaped conversion parts 1 and the beam connector 2 corresponding to the top of the first layer support cylinder are not welded (as shown by the blue longitudinal support beam). Figure 7 (As shown in the gray longitudinal support beam), the second layer of support cylinders began to be hoisted at the same time.

[0051] During the installation of the second-layer support cylinder, the welds at both ends of the horizontal ring beam 4 between two adjacent beam connectors 2 at the top of the second-layer support cylinder are completed, and the welds at both ends of one set of longitudinal support beams 3 in one of the two adjacent sets of longitudinal support beams 3 in the second-layer support cylinder are welded to 30% of the total thickness (e.g., Figure 8 The blue longitudinal support beam is shown in the image, while the welds at both ends of the other set of longitudinal support beams 3 are not welded (as shown in the image). Figure 8 (As shown by the gray longitudinal support beam), the third layer of support cylinders is hoisted at the same time, and the remaining welds of the first layer of support cylinders are welded, so that all the welds of the first layer of support cylinders are completed before the third layer of support cylinders are installed.

[0052] During the installation of the third-layer support cylinder, the remaining welds of the second-layer support cylinder are welded, and all welds of the second-layer support cylinder are completed before the installation of the fourth-layer support cylinder. At this time, the welding of the members of the third-layer support cylinder is also carried out in the same manner as the second layer. The welds at both ends of the horizontal ring beam 4 between two adjacent beam connectors 2 at the top of the third-layer support cylinder are completed, and the welds at both ends of one set of longitudinal support beams 3 in one of the two adjacent sets of longitudinal support beams 3 in the third-layer support cylinder are welded to 30% of the total thickness (e.g., Figure 9 The red longitudinal support beam is shown in the middle, while the welds at both ends of the other set of longitudinal support beams 3 are not welded (as shown in the middle). Figure 9 (The medium gray longitudinal support beam is shown). Ensure that it is welded to form a temporary stable structure before installing the fourth layer of support tubes.

[0053] The overall welding sequence of the support cylinder is as follows: For the horizontal surfaces, welding is performed simultaneously using a zoned back-and-forth welding method; for the vertical surfaces, welding is performed from bottom to top. Figure 12 As shown.

[0054] The welding method for the longitudinal support beam 3 is as follows: when a single longitudinal support beam 3 has two weld joints in one direction, the weld joint at one end is welded first, and then the weld joint at the other end is welded. The two longitudinal support beams 3 on both sides of the same beam connector 2 are welded simultaneously, such as... Figures 10 to 11 As shown.

[0055] Example 3:

[0056] Furthermore, at the top of the support cylinder, where the deflection angle and span are excessively large, the complex intersecting nodes have many branches, large curved surfaces, and thick walls. While their shapes are similar, they are not identical. Ordinary steel and intersecting nodes cannot meet the load-bearing requirements. This node adopts a one-time molding technology for irregular curved steel structure nodes, utilizing the high strength and one-time casting characteristics of cast steel to perfectly achieve effective connection at locations with excessive deflection angles and spans. The wall thickness of the cast steel node needs to be finalized based on the finite element analysis results. The casting process of the node is simulated and calculated to address its characteristics. Three-dimensional laser scanning technology is used to accurately scan the external dimensions of the cast steel node. This three-dimensional laser scanning measurement technology is combined with a BIM information model. By scanning the point cloud of the completed node and comparing and analyzing the external dimensions using software, accurate detection of the node's external dimensions is achieved.

[0057] like Figures 13 to 17 As shown, the top of the support tube is connected to the roof grid shell using a one-time cast steel node 5. The cast steel node 5 includes multiple one-time cast connection parts 51. The multiple connection parts 51 are not in the same vertical plane. The end of the connection part 51 is welded to the end of the longitudinal support beam of the support tube or the end of the box girder of the roof grid shell with a single-sided V-shaped bevel at the welding position. The opening angle is 35°. A double-lined reinforced ring structure 52 is adopted. The thickness of the ring is not less than 16mm and not less than the thickness of the steel plate of the longitudinal support beam of the support tube. The height of the inner ring is 100mm. A total of 8 grooves 54 are opened on the four sides of the ring to release the constraint and prevent the weld metal from segregating in the middle of the weld and cracking along the grain boundary.

[0058] Innovation in Low-Alloy Steel and Cast Steel Welding Technology: The cast steel material used is ZG340-550H, while the support cylinder rods are made of Q355B and Q390GJ steel plates. When welding dissimilar steels to cast steel, the differences in alloy element content and mechanical properties between the two materials easily lead to inhomogeneities in mechanical properties and instability in the interface structure. In narrow and deep bevels, the weld metal is prone to segregation in the center of the weld. When the constraint exceeds the tensile strength of the segregated portion, crystallization is greatly affected, leading to cracking along grain boundaries. This invention employs low-alloy steel and cast steel welding technology. By analyzing the carbon equivalent of the actual steel and cast steel parts, various process parameters (preheating temperature, welding current, welding voltage, etc.) are further optimized. Based on the optimized parameters, a matching welding procedure qualification is selected to ensure the weld passes inspection on the first attempt and achieves optimal overall weld joint performance. The welding material used is E50 series flux-cored welding wire (FCAW). All parts of the cast steel support that are suitable for ultrasonic testing undergo 100% ultrasonic testing, meeting the requirements of inspection standard GB / T 7233.1. The welding process strictly follows the requirements of multi-layer, multi-pass, and staggered welding. During welding, the interpass temperature is strictly controlled at 150-200℃. After welding, slow cooling and heat preservation are carried out according to GB50661 to allow hydrogen gas in the deposited metal to escape, ensuring the excellent comprehensive performance of the weld joint.

[0059] Furthermore, when the support tube is constructed to the point where it intersects with the roof grid at the top, two angle steels with a cross section of L100*6 and material of Q235B are used to tie it to the already installed support tube structure. After all the support tubes are welded, the angle steels are removed. The flower-shaped part at the top of the support tube extends upward and outward along the perimeter of the support tube, and the inclination of the flower-shaped part matches the inclination of the downward extension structure 103 at the roof steel structure.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding, characterized in that: The support cylinder has a multi-layer structure. Multiple V-shaped conversion parts (1) are provided at the bottom of the support cylinder. Multiple beam connectors (2) are evenly spaced at the top of each layer. The beam connectors (2) of adjacent layers are arranged in a triangular staggered manner. The beam connectors (2) of adjacent layers are connected by longitudinal support beams (3). The two adjacent beam connectors (2) of each layer are connected by horizontal ring beams (4) to form a ring structure. The bottom of the V-shaped conversion parts (1) is installed on the support structure. The method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding includes the following steps: S1. Divide the support cylinder into layers and groups. Among them, the multiple V-shaped conversion parts (1) are divided into two groups by skipping one and selecting one. The two longitudinal support beams (3) between the beam connector (2) at the top of the lower layer support cylinder and the two beam connectors (2) at the top of the upper layer support cylinder are divided into one group. The two longitudinal support beams (3) in each group are arranged in a V shape. S2. Installation of the first layer support tube: Weld the welds at both ends of the horizontal ring beam (4) between the two adjacent beam connectors (2) at the top of the first layer support tube, weld the welds at both ends of the two longitudinal support beams (3) between each V-shaped conversion piece (1) of the first group and the two corresponding beam connectors (2) at the top of the first layer support tube, and do not weld the welds at both ends of the longitudinal support beams (3) between the V-shaped conversion piece (1) of the second group and the corresponding beam connectors (2) at the top of the first layer support tube, so that the first layer support tube forms a temporary stable structure; S3. Installation of the second layer support tube: Weld the welds at both ends of the horizontal ring beam (4) between the two adjacent beam connectors (2) at the top of the second layer support tube, weld the welds at both ends of one set of longitudinal support beams (3) of the two adjacent sets of longitudinal support beams (3) of the second layer support tube, and do not weld the welds at both ends of the other set of longitudinal support beams (3), so that the second layer support tube forms a temporary stable structure.

2. The method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding according to claim 1, characterized in that: Also includes: S4. Installation of the third layer support tube: After the welds at both ends of the horizontal ring beam (4) between the two adjacent beam connectors (2) at the top of the third layer support tube are completed, weld the welds at both ends of one set of longitudinal support beams (3) of the two adjacent sets of longitudinal support beams (3) of the third layer support tube, and do not weld the welds at both ends of the other set of longitudinal support beams (3), so that the third layer support tube forms a temporary stable structure. S5. Installation of the fourth layer support tube and the upper layer support tube: Repeat steps S2 to S4 to complete the installation of the components of the subsequent support tube layers until the core tube construction is completed.

3. The method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding according to claim 2, characterized in that: When the first layer of support cylinder is installed, the top of the weld seams at both ends of the horizontal ring beam (4) between the two adjacent beam connectors (2) at the top of the first layer of support cylinder is completed, and the weld seams at both ends of the two longitudinal support beams (3) between each V-shaped conversion piece (1) of the first group and the two beam connectors (2) above it are welded to 30% of the total thickness. At the same time, the second layer of support cylinder is hoisted.

4. The method for preventing deformation by layered skip welding of irregularly shaped, large-span support cylinders according to claim 3, characterized in that: When installing the second layer of support tube, the welds at both ends of the horizontal ring beam (4) between the two adjacent beam connectors (2) at the top of the second layer of support tube are completed, and the welds at both ends of one set of longitudinal support beams (3) in the two adjacent sets of longitudinal support beams (3) of the second layer of support tube are welded to 30% of the total thickness. At the same time, the third layer of support tube is hoisted and the remaining welds of the first layer of support tube are welded, so that all the welds of the first layer of support tube are completed before the third layer of support tube is installed.

5. The method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding according to claim 4, characterized in that: When installing the third layer of support cylinder, weld the remaining welds of the second layer of support cylinder, and complete all welds of the second layer of support cylinder before installing the fourth layer of support cylinder.

6. The method for preventing deformation by layered skip welding of irregularly shaped, large-span support cylinders according to claim 1, characterized in that: The overall welding sequence of the support tube is as follows: the plane is welded simultaneously using the partitioned back welding method, and the vertical surface is welded from bottom to top; the welding method of the longitudinal support beam (3) is as follows: when there are two welding joints in one direction of a single longitudinal support beam (3), the welding joint at one end is welded first, and then the welding joint at the other end is welded. The two longitudinal support beams (3) on both sides of the same beam connector (2) are welded simultaneously.

7. The method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding according to claim 1, characterized in that: The beam connector (2) includes: a first insert plate (21), a second insert plate (22), a supporting beam connector (23), and a ring beam connector (24); the first insert plate (21) and the second insert plate (22) are cross-shaped; there are two ring beam connectors (24), which are respectively disposed on both sides of the first insert plate (21); one end of the ring beam connector (24) is provided with a notch, and the second insert plate (22) is inserted into the notch, and both the first insert plate (21) and the second insert plate (22) are connected to the supporting beam connector (23). The ring beam connector (24) is fixedly connected, and the other end of the ring beam connector (24) is connected to the horizontal ring beam (4); there are four support beam connectors (23), and the four support beam connectors (23) are respectively set on the outside of the four corners of the connection between the first insert plate (21) and the second insert plate (22), and the first insert plate (21) and the ring beam connector (24) are both connected to one end of the support beam connector (23), and the other end of the support beam connector (23) is connected to the longitudinal support beam (3) below or below.

8. The method for preventing deformation by layered skip welding of irregularly shaped, large-span support cylinders according to claim 1, characterized in that: The top of the support tube is connected to the roof mesh shell by a one-time cast steel node (5). The cast steel node (5) includes multiple one-time cast connection parts (51). The multiple connection parts (51) are not in the same vertical plane. The end of the connection part (51) is welded to the longitudinal support beam of the support tube with a single-sided V-shaped bevel with an opening angle of 35°, and a double-lined reinforced ring structure (52) is adopted.

9. The method for preventing deformation of irregularly shaped, large-span support cylinders by layered skip welding according to claim 1, characterized in that: When the support tube is constructed to the point where it intersects with the roof grid shell, two angle steels are used to tie it to the already installed support tube structure. After all the support tubes are welded, the angle steels are removed. The flower-shaped part at the top of the support tube extends upward and outward along the perimeter of the support tube, and the inclination of the flower-shaped part matches the inclination of the downward extending structure of the roof steel structure.

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