A welding construction method for curved special-shaped main tower decorative panels with inner concrete and outer steel

Abstract

The present invention discloses a method for welding curved, special-shaped, concrete-interior, and steel-exterior main tower decorative panels, relating to the technical field of special-shaped bridge tower construction. The method includes constructing a tooling platform frame, installing lifting lugs, determining the position of the tooling platform, setting a DC electromagnet, connecting the tooling platform to the curved decorative panels, welding, adjusting the position of the tooling platform, repeating the welding process to complete the installation and welding of all curved decorative panels on the bridge tower, and finally removing the tooling platform. The tooling platform of the present invention facilitates assembly and disassembly, and prevents the tooling platform from rotating along the cross-section of the latch, thereby improving the wind resistance of the tooling platform.

Description

Technical Field

[0001] The invention belongs to the technical field of special-shaped bridge tower construction, and particularly relates to a welding construction method for a curved special-shaped main tower decorative plate with inner concrete and outer steel. Background Art

[0002] Bridge tower structures are generally used in suspension bridges and cable-stayed bridges. Their function is to support the main cables, share the vertical forces on the cables, and ensure overall stability under the action of wind and earthquake forces. With the improvement of architectural level and people's aesthetic level, bridge towers are not only required to have a supporting function, but also a certain beautification effect during construction. Curved special-shaped bridge towers are one of them, such as Figure 1 As shown in the figure, the setting of the curved special-shaped bridge tower is that the twisting and rising of the special-shaped curved surface is more conducive to the layout of the anchor points of the inclined cables; secondly, it is to match the pedestrian cantilever leisure trail with a butterfly-shaped cable net to form a more beautiful landscape effect.

[0003] During the construction of the curved, special-shaped towers of offshore artificial island cross-sea bridges, after the tower decorative structure is assembled and welded on the ground, the upper and lower segments need to be butt-jointed at the top of the tower. Therefore, an overhead tooling platform is required at the butt-joint weld locations for the external butt-joint welds. This platform must not only be safe and stable, but also easy to install and disassemble, with a quick turnaround time. Because the exterior curved decorative panels of the curved special-shaped towers are made of special-shaped curved steel plates that twist and rise from the bottom to the top, existing tooling platform construction and installation require tailored installation platforms for different segments. This is cumbersome and time-consuming, resulting in high construction costs and an inability to meet construction deadlines.

[0004] Therefore, how to provide a welding construction method for a curved special-shaped main tower decorative panel with inner concrete and outer steel becomes a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a welding construction method for curved special-shaped main tower decorative panels with concrete inside and steel outside. After fully considering the requirements of high-altitude construction of the main tower steel structure, the present invention combines the actual situation on site and proposes a welding construction method for adjusting the size of the tooling operating platform by adjusting the assembly section to adapt to different segment curved decorative panels under the premise of ensuring safety.

[0006] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: a method for welding and constructing a curved special-shaped main tower decorative plate with concrete inside and steel outside, comprising the following construction steps:

[0007] S01. Build the tooling operating platform frame. The tooling operating platform frame is welded from square tubes. Steel plates are bolted between assembly sections. The platform bottom is paved with patterned plate, and the edges are welded to the square tubes. The facade and sides are fully covered with three-proof fabric.

[0008] S02. Ear plates are provided on the sides and top of the tooling operation platform for temporary fixation of the tooling operation platform and suspension of the fall chain. The tooling operation platform and the curved decorative plate hanging ear connection point are connected by a latch;

[0009] S03. Divide the tooling operating platform into three assembly sections, which are dismantled as the external dimensions of the pylon decorative structure are reduced;

[0010] S04. Determine the location of the tooling operating platform. Following the segmented design of the pylon's decorative structure, the tooling operating platform should be located outside the curved decorative panel of the previous segment, with the lower portion of the platform 1.2 meters from the interface with the curved decorative structure.

[0011] S05. To reduce the impact of wind loads on the stability of the tooling platform, a DC electromagnet is installed below the platform to attach the lower portion of the tooling platform to the curved decorative panel, preventing the platform from rotating along the cross-section of the latch.

[0012] S06. Hoist the tooling platform along with the curved decorative panel into place. Connect the platform to the curved decorative panel using latches. When the previous curved decorative panel is docked, the installation and welding personnel perform seaming and welding operations within the tooling platform.

[0013] S07. After the butt welds are completed, the welder hooks the fall chain onto the lugs of the tooling platform. Then, he ascends the cage ladder and unlatches the lugs between the tooling platform and the curved decorative panel. He then uses the cage ladder located in the middle of the tooling platform to enter the pylon's decorative structure. He disconnects the electromagnet power supply and simultaneously raises the fall chain on the upper section until the tooling platform reaches the point where it connects to the lugs of the curved decorative panel.

[0014] S08. Repeat this installation process to complete the installation and welding of all curved decorative panels on the bridge tower.

[0015] S09. To dismantle the tooling operating platform, first release the constraints between the tooling operating platform and the curved decorative panel, then disconnect the electromagnet constraints, and finally remove the lifting chain device with the cooperation of the tower crane, and use the tower crane to lift it to the ground for storage.

[0016] Furthermore, when installing the tooling operating platform for the first time, it should be debugged and installed on the ground.

[0017] Furthermore, the size of the square tube in S01 is 40×40×4 mm, and the thickness of the patterned plate is 3 mm.

[0018] Furthermore, the square tube ends of the assembly section in S01 are provided with square flange connection joints, which are connected by four sets of bolts to achieve rapid disassembly and assembly of the assembly section.

[0019] Furthermore, the assembly lengths of the three assembly sections in S03 are 1 m, 2 m, and 1 m respectively, and the size of the assembled overall tooling operating platform is 1.5×1.2×4 m.

[0020] Furthermore, the model of the DC electromagnet described in S05 is KK-P120 / 40, which is used to provide a suction force of 300 kg vertically to the surface of the outer curved decorative panel for the tooling operating platform.

[0021] Furthermore, the DC electromagnet in S05 is provided with a backup power supply, which is a 24V battery, for emergency operations of operators in power outages or extreme weather conditions.

[0022] Furthermore, the cage ladder in S07 is set in the middle position of the construction platform, the bottom of the cage ladder is placed on the tooling operating platform, and the top is connected to the steel structure through a hook and fixed with spot welding.

[0023] Furthermore, one end of the fall chain is arranged on the ear plate of the tooling operating platform, and the other end of the fall chain is connected to the lifting ear provided on the curved decorative plate on the outer side of the bridge tower, which is used for raising the tooling operating platform.

[0024] The beneficial effects of the present invention are:

[0025] 1. In view of the fact that the curved surface decorative panels of the bridge towers are made of special-shaped curved steel plates that twist and rise from the bottom to the top of the tower, the tooling operation platform is equipped with an assembly section. By adjusting the assembly section, the size of the tooling operation platform can be adjusted, so that the tooling operation platform can adapt to the curved and special-shaped exterior decorative panels of the bridge towers in different sections. This provides an aerial work platform for external girth welding while reducing material consumption.

[0026] 2. Under the premise of ensuring safety, the size of the tooling operating platform can be changed by adjusting the assembly section, thus shortening the time for disassembly and installation;

[0027] 3. The platform is fixed by connecting the tooling operation platform with the lifting ears of the curved decorative panel, and a tower crane is used to complete the lifting, fixing and dismantling of the tooling operation platform. The whole process is more convenient and the construction period is further shortened.

[0028] 4. A DC electromagnet is set at the bottom of the operating platform to adsorb the bottom of the operating platform on the surface of the curved decorative structure, so that the tooling operating platform does not rotate along the cross section of the pin, thereby improving the wind resistance of the tooling operating platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1This is a schematic diagram of the main structure of the curved special-shaped concrete inner and steel outer main tower of the present invention;

[0030] Figure 2 This is a schematic diagram of the tooling operating platform of the present invention;

[0031] Figure 3 This is a top view of the tooling operating platform of the present invention;

[0032] Figure 4 This is a front view of the tooling operating platform frame of the present invention;

[0033] Figure 5 This is a left view of the tooling operating platform frame of the present invention;

[0034] Figure 6 This is a front view of the square flange connection joint of the present invention;

[0035] Figure 7 It is a schematic diagram of the docking of the square flange connection joint of the present invention.

[0036] In the figure: 1-tower body; 2-tooling operation platform frame; 3-partition gap; 4-square tube; 5-square flange connection joint; 6-ear plate; 7-fall chain; 8-cage ladder; 9-DC electromagnet. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "horizontal", "inner", "outer", "one side", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The present invention provides a method for welding a curved special-shaped main tower decorative plate with concrete inside and steel outside, comprising the following construction steps:

[0040] S01. Build the tooling operating platform frame 2, which is used for welding the separation seams 3 of the curved decorative panels of the tower body 1. The tooling operating platform frame 2 is welded from 40×40×4mm square tubes 4. Square flange connectors 5 are installed at the ends of the square tubes 4 between the assembly sections. These are connected with four sets of bolts to enable rapid assembly and disassembly of the assembly sections. The platform bottom is paved with 3mm patterned plate, the edges of which are welded to the square tubes 4. The facade and sides are fully covered with three-proof fabric.

[0041] S02. Lugs 6 are installed on the sides and top of the tooling platform to temporarily secure it and suspend a fall chain 7. The tooling platform is connected to the lifting lugs on the curved decorative panel using latches. When in use, one end of the fall chain 7 is attached to the lug 6 of the tooling platform, and the other end is connected to the lifting lug on the curved decorative panel on the outside of the pylon, allowing the tooling platform to be raised.

[0042] S03. Divide the tooling operating platform into three assembly sections, with assembly lengths of 1m, 2m, and 1m, respectively. The assembled tooling operating platform measures 1.5 x 1.2 x 4m. The three sections can be disassembled as the external dimensions of the pylon decorative structure are reduced.

[0043] S04. Determine the location of the tooling operating platform. Following the segmented design of the pylon's decorative structure, the tooling operating platform should be located outside the curved decorative panel of the previous segment, with the lower portion of the platform 1.2 meters from the interface with the curved decorative structure.

[0044] S05. To reduce the impact of wind loads and other factors on the stability of the tooling platform, a DC electromagnet 9 is installed below the platform to secure the lower portion of the tooling platform to the curved decorative panel, preventing the platform from rotating along the cross-section of the latch. The DC electromagnet 9, model KK-P120 / 40, provides a 300kg suction force perpendicular to the curved decorative panel. A 24V battery backup power supply is provided for emergency operations during power outages or extreme weather conditions.

[0045] S06. Hoist the tooling platform along with the curved decorative panel into place. Connect the platform to the curved decorative panel using latches. When the previous curved decorative panel is docked, the installation and welding personnel perform seaming and welding operations within the tooling platform.

[0046] S07. After the butt welds are completed, the welder hooks the fall chain onto the lug plate 6 of the tooling platform and then climbs onto the cage ladder 8. The cage ladder 8 is located in the middle of the construction platform. The bottom of the cage ladder 8 is placed on the tooling platform, and the top is connected to the steel structure via hooks and spot welded. The latches at the lug plate of the tooling platform and the lifting lug of the curved decorative panel are released. The welder then follows the cage ladder 8 located in the middle of the tooling platform into the interior of the pylon decorative structure. The electromagnet is disconnected, and the fall chain 7 of the upper section is simultaneously raised until the tooling platform reaches the position where the tooling platform of the upper section is connected to the lifting lug of the curved decorative panel.

[0047] S08. Repeat this installation process to complete the installation and welding of all curved decorative panels on the bridge tower.

[0048] S09. To dismantle the tooling operating platform, first release the constraints between the tooling operating platform and the curved decorative panel, then disconnect the electromagnet constraints, and finally remove the lifting chain 7 device with the cooperation of the tower crane, and use the tower crane to lift it to the ground for storage.

[0049] Example 1

[0050] This embodiment is a construction plan for a cross-sea connecting bridge on an offshore artificial island in Hainan. The method of building a water-stop cofferdam is adopted to provide the dry land construction conditions required during construction.

[0051] The bridge tower for this project utilizes exterior curved decorative panels and an internal core concrete column. The tower stands 86 meters tall, with a 67-meter tower body and a 6-meter spire. The tower body is a reinforced concrete core tube structured with curved decorative steel panels, connected by a diaphragm. The curved decorative panels, constructed from special-shaped curved steel plates, twist and rise from the base to the top. The spire measures 6 meters in height, and the decorative panels of the tower structure twist and rotate as they rise. Their dimensions decrease with increasing height. Therefore, the design of the tooling platform must not only account for the reduced cross-sectional area of the decorative panels, but also the impact of wind loads on the tooling platform as it continues to rise.

[0052] The tooling operating platform frame is welded from 40×40×4mm square tubes. The assembly sections are bolted with steel plates. The bottom of the platform is paved with 3mm patterned plates, and the edges are welded and fixed to the square tubes. The facades and sides are fully covered with three-proof cloth, which can not only protect the butt welds from the influence of wind during welding, but also play a role in welding fire prevention.

[0053] The tooling operation platform for the curved decorative panels on the outer surface of the bridge tower is divided into three assembly sections with assembly lengths of 1m, 2m and 1m respectively. The size of the assembled tooling platform is 1.5×1.2×4m.

[0054] The three assembly sections can be removed as the exterior dimensions of the pylon's decorative structure are reduced. The tooling platform is connected to the curved decorative panel's lifting lugs with latches. To reduce the impact of wind loads and other factors on the platform's stability, a DC electromagnet, model KK-P120 / 40, is installed beneath the platform. This electromagnet provides a 300kg suction force perpendicular to the outer surface of the curved decorative panel, securing the lower portion of the platform to the curved decorative structure and preventing rotation along the latch's cross-section.

[0055] When installing the tooling platform for the first time, it should be debugged and installed on the ground, then hoisted into place along with the curved decorative panels. When the previous section is butt-jointed, the installation and welding personnel can perform seaming and welding operations within the tooling platform. Once the butt welds are completed, the installation and welding personnel should hang the fall chain on the lug of the tooling platform, then ascend the cage ladder, unlatch the latch connecting the tooling platform to the curved decorative panel's lifting lug, and use the cage ladder installed in the middle of the tooling platform to enter the bridge tower's decorative structure. After disconnecting the electromagnet power supply, the fall chain installed on the upper section is simultaneously raised until the platform reaches the position where the platform of the previous section connects to the curved decorative panel's lifting lug. This installation process is repeated to complete the installation and welding of all curved decorative panels on the bridge tower. The maximum assembled tooling platform length is 4 meters, and the butt weld length of the curved decorative panel is 4.275 meters.

[0056] To dismantle the tooling operating platform, the constraints between the tooling platform and the curved decorative panel should be released first, then the DC electromagnet constraints should be disconnected, and finally the lifting chain device should be removed with the cooperation of the tower crane and hoisted to the ground storage area by the tower crane.

[0057] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for welding curved special-shaped main tower decorative panels with concrete inside and steel outside, characterized by: The construction steps include: S01. Build the tooling operating platform frame. The tooling operating platform frame is welded from square tubes. Steel plates are bolted between assembly sections. The platform bottom is paved with patterned plate, and the edges are welded to the square tubes. The facade and sides are fully covered with three-proof fabric. S02. Ear plates are provided on the sides and top of the tooling operation platform for temporary fixation of the tooling operation platform and suspension of the fall chain. The tooling operation platform and the curved decorative plate hanging ear connection point are connected by a latch; S03. Divide the tooling operating platform into three assembly sections, which are dismantled as the external dimensions of the pylon decorative structure are reduced; S04. Determine the location of the tooling operating platform. Following the segmented design of the pylon's decorative structure, the tooling operating platform should be located outside the curved decorative panel of the previous segment, with the lower portion of the platform 1.2 meters from the interface with the curved decorative structure. S05. To reduce the impact of wind loads on the stability of the tooling platform, a DC electromagnet is installed below the platform to attach the lower portion of the tooling platform to the curved decorative panel, preventing the platform from rotating along the cross-section of the latch. S06. Hoist the tooling platform along with the curved decorative panel into place. Connect the platform to the curved decorative panel using latches. When the previous curved decorative panel is docked, the installation and welding personnel perform seaming and welding operations within the tooling platform. S07. After the butt welds are completed, the welder hooks the fall chain onto the lugs of the tooling platform. Then, he ascends the cage ladder and unlatches the lugs between the tooling platform and the curved decorative panel. He then uses the cage ladder located in the middle of the tooling platform to enter the pylon's decorative structure. He disconnects the electromagnet power supply and simultaneously raises the fall chain on the upper section until the tooling platform reaches the point where it connects to the lugs of the curved decorative panel. S08. Repeat this installation process to complete the installation and welding of all curved decorative panels on the bridge tower. S09. To dismantle the tooling operating platform, first release the constraints between the tooling operating platform and the curved decorative panel, then disconnect the electromagnet constraints, and finally remove the lifting chain device with the cooperation of the tower crane, and use the tower crane to lift it to the ground for storage.

2. The method for welding and constructing curved special-shaped concrete inner and steel outer main tower decorative panels according to claim 1, characterized in that: When installing the tooling operating platform for the first time, it should be debugged and installed on the ground.

3. The method for welding curved special-shaped concrete inner and steel outer main tower decorative panels according to claim 1, characterized in that: The size of the square tube in S01 is 40×40×4 mm, and the thickness of the patterned plate is 3 mm.

4. According to the welding construction method of a curved special-shaped concrete interior and steel exterior main tower decorative panel according to claim 1, the square tube end of the assembly section in S01 is provided with a square flange connection joint, and the square flange connection joint is connected by four sets of bolts to achieve rapid disassembly and assembly of the assembly section.

5. The method for welding and constructing curved special-shaped concrete inner and steel outer main tower decorative panels according to claim 1, characterized in that: The assembly lengths of the three assembly sections in S03 are 1m, 2m and 1m respectively, and the size of the assembled overall tooling operating platform is 1.5×1.2×4m.

6. The method for welding and constructing curved special-shaped concrete inner and steel outer main tower decorative panels according to claim 1, characterized in that: The model of the DC electromagnet described in S05 is KK-P120 / 40, which is used to provide a suction force of 300 kg vertically to the surface of the outer curved decorative panel for the tooling operating platform.

7. The method for welding curved special-shaped concrete inner and steel outer main tower decorative panels according to claim 1, characterized in that: The DC electromagnet in S05 is provided with a backup power supply, which is a 24V battery and is used for emergency operations of operators in power outages or extreme weather conditions.

8. The method for welding and constructing curved special-shaped main tower decorative panels with concrete inside and steel outside according to claim 1, characterized in that: The cage ladder described in S07 is set in the middle position of the construction platform. The bottom of the cage ladder is placed on the tooling operating platform, and the top is connected to the steel structure through a hook and fixed with spot welding.

9. The method for welding and constructing curved special-shaped concrete inner and steel outer main tower decorative panels according to claim 1, characterized in that: One end of the fall chain is arranged on the ear plate of the tooling operating platform, and the other end of the fall chain is connected to the lifting ear arranged on the curved decorative plate outside the bridge tower, which is used for raising the tooling operating platform.

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