A bridge floor system lattice beam crossbeam main weld joint rotatable welding platform and welding system

Abstract

The utility model relates to a kind of bridge floor system lattice beam crossbeam main weld joint rotatable welding platform and welding system, rotatable welding platform, rotary support structure is arranged several rectangular openwork in first direction interval, each openwork can be simultaneously used to adapt the protruding portion of the corresponding upper node plate or lower node plate of the flange plate inserted in the both sides of crossbeam, rotary support structure can be stably supported and transversely limited to crossbeam;While rotary support structure and the top of each vertical support mechanism are connected by the rotation of pivot along the first direction, so that after crossbeam is placed on rotary support structure, it can be stably realized along transverse left and right vertical rotation around pivot, and the openwork of rotary support structure can be used to limit and stably support inclined crossbeam, reduce the disturbance to weld joint, to make it can better weld crossbeam, can improve welding quality, and the site required by this rotation mode is smaller compared with the site required by only through gantry crane steering and turning over.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for welding crossbeams of bridge deck grid beams, and in particular to a rotatable welding platform and welding system for the main weld of the crossbeam of a bridge deck grid beam. Background Technology

[0002] The main span of the North Ring Road Bridge in Section No.QL11 of a certain canal overpass project is 372m. The main bridge deck is laid out in a whole-width manner, with a deck width of 43m. Except for the end crossbeams which use box sections, the rest all use I-shaped sections. The entire bridge has a total of 153 main / secondary crossbeams (I-beams), all of which are 43m long components.

[0003] The conventional design for the main welds of the web and top / bottom plates of an I-beam is a full-penetration fillet weld. The welding method involves anchoring the beam to an inclined, fixed welding base on the ground, adjusting the angle, and then directly hoisting the beam onto a platform. One side of the main weld is welded using submerged arc welding. Then, a double-gantry crane directly clamps and "turns" the top and bottom flanges of the I-beam at one point each to weld the second main weld. Next, the double-gantry crane directly clamps and "flips" the top or bottom flanges at two points, cleans the reverse side, and welds the third weld. Finally, it "turns" the beam again to weld the fourth weld. However, in limited space and busy gantry crane operations, the welding method of two "turns" and one direct flip of the gantry crane clamps for ultra-long I-beams is no longer applicable. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the need for a large site and the easy disturbance of the weld seam when using gantry crane clamps to assist in the rotation and welding of ultra-long crossbeams, which affects the welding quality. This invention provides a rotatable welding platform and welding system for the main weld seam of the crossbeam of a bridge deck grid beam.

[0005] In a first aspect, this utility model provides a rotatable welding platform for the main weld seam of the crossbeam of a bridge deck grid beam, comprising:

[0006] A base, wherein the base is disposed along a first direction and the base is capable of being fixed;

[0007] A plurality of vertical support mechanisms, all of which are arranged vertically and are spaced apart along a first direction, and are fixed to the top of the base;

[0008] A rotating support structure is provided, which is arranged along a first direction and located directly above all the vertical support mechanisms. The rotating support structure is rotatably connected to the top of each of the vertical support mechanisms via a pivot along the first direction. The rotating support structure is provided with a number of rectangular cutouts at intervals along the first direction. Each cutout can be used to simultaneously accommodate the protruding part of the corresponding upper or lower node plate of the flange plate on both sides of the crossbeam.

[0009] This solution describes a rotatable welding platform for the main weld seam of a bridge deck grid beam. The base, positioned along a first direction, is fixed, allowing for stable support of vertically spaced support structures along that direction. This provides stable support for different parts of the rotating support structure along the first direction. The rotating support structure features several rectangular openings spaced along the first direction. Each opening can simultaneously accommodate the protruding portion of the corresponding upper or lower node plate inserted into the flange plates on both sides of the beam. This allows the openings and the protruding portions of the upper or lower node plates of the beam to work together, enabling the rotating support structure to rotate smoothly. The rotating support structure can provide stable support and lateral restraint for the crossbeam; and the top of each of the vertical support mechanisms is connected to the rotating support structure via a rotating shaft along the first direction, so that after the crossbeam is placed on the rotating support structure, it can stably rotate vertically left and right around the rotating shaft. Moreover, the hollow of the rotating support structure can restrain and stabilize the inclined crossbeam, reduce disturbance to the weld, and thus enable better welding of the crossbeam, improve welding quality, and the space required by this rotation method is smaller than that required by turning and over using only a gantry crane.

[0010] Preferably, the rotating support structure includes two longitudinal connections and several transverse connections. The two longitudinal connections are arranged along a first direction, and all the transverse connections are spaced apart along the first direction. All the transverse connections are connected between the two longitudinal connections. The middle part of a portion of the transverse connections is rotatably connected to the top of the corresponding vertical support mechanism via a corresponding pivot. The hollow is formed by a portion of two adjacent transverse connections cooperating with the longitudinal connections. The gap width between the two longitudinal connections is adapted to the distance between two adjacent upper node plates and two adjacent lower node plates in the width direction of the beam.

[0011] The rotating support structure, formed by two longitudinal connections and several transverse connections, is low-cost and lightweight, which facilitates the strength design of the vertical support mechanism and the rotating shaft, significantly reducing costs. Furthermore, the transverse connections provide installation conditions for the rotational connection between the vertical support mechanism and the rotating support structure via the rotating shaft. The hollow section, formed by the partial cooperation of two adjacent transverse connections with the longitudinal connections, better accommodates the distances between adjacent upper and lower node plates in the width direction of the beam. This allows the rotating support structure to better support and laterally limit the beam, reducing disturbance to the beam welds and improving welding quality.

[0012] Preferably, the transverse connection is a rod. Except for the two adjacent transverse connections with the hollowed-out structure, the other two adjacent transverse connections are connected by X-braces. This can enhance the connection between adjacent transverse connections and the strength between transverse and longitudinal connections, thereby better ensuring the support and transverse restraint of the beam, reducing disturbance to the beam weld, and improving welding quality.

[0013] Preferably, the base includes a base plate corresponding to the number of vertical support mechanisms, and the bottom of each vertical support mechanism is fixed to the corresponding base plate. The base plate can be fixed, which can reduce costs while ensuring support stability.

[0014] Preferably, the vertical support mechanism is a column, which has strong vertical support capacity.

[0015] Preferably, the bottom of the column is welded to the top surface of the base plate, and a stiffening plate is welded between the side of the column and the top surface of the base plate. The stiffening plate can enhance the connection strength between the column and the base plate and enhance the support capacity.

[0016] Preferably, the stiffening plates are welded to the top surface of the base plate on both sides of the column in the first direction, which can better resist the gravity of the rotating support structure after rotating around the pivot on the vertical support mechanism; the column is a plate, which is arranged in the transverse direction of the rotating support structure, which facilitates the setting of the pivot and the stiffening plates.

[0017] Preferably, the length of the rotary support structure in the first direction is 40m-50m, which can be used to support a beam of 40m-50m, ensuring stable support and lateral restraint for the beam;

[0018] The length of the cutout in the first direction is greater than the protruding part of the corresponding upper node plate and lower node plate, which facilitates the hoisting of the crossbeam onto the rotating support structure, so that the protruding part of the upper node plate or lower node plate can smoothly enter the cutout of the rotating support structure.

[0019] And / or, the rotating shaft is an adjusting bolt, which is low in cost and provides stable rotation;

[0020] In a second aspect, this utility model provides a rotatable welding system for the main weld of a bridge deck grid beam crossbeam, including several turning and lifting devices and the aforementioned rotatable welding platform for the main weld of a bridge deck grid beam crossbeam. The turning and lifting devices are capable of holding the upper and lower sides of the flange plates on the same transverse side of the crossbeam.

[0021] The rotatable welding system for the main weld of the crossbeam of the bridge deck grid beam described in this utility model provides stable support and lateral restraint for the crossbeam through a rotatable welding platform. By clamping the upper and lower sides of the flange plate on the same lateral side of the crossbeam with the turning lifting device, the crossbeam can be raised on that side by applying force through all the turning lifting devices. Then, under the gravity of the crossbeam, the other side of the crossbeam presses against the corresponding side of the rotating support structure, allowing the crossbeam and the rotating support structure to rotate as a whole around the axis of rotation. This allows the crossbeam to maintain its tilt and be stably supported. This tilted state can meet the welding requirements of the crossbeam weld, reduce the space requirements, and ensure that the weld is not disturbed, thereby greatly improving its welding quality.

[0022] Preferably, the turning and lifting device includes a first U-shaped groove, a second U-shaped groove, and a detachable bolt. The opening widths of the first and second U-shaped grooves are adapted to the thickness of the flange plate of the crossbeam. A U-shaped groove is formed on one side of the opening of the second U-shaped groove. Corresponding connecting holes are formed on one side of the opening of the first U-shaped groove and on both sides of the U-shaped groove. The detachable bolt is inserted into the corresponding connecting holes to connect and fix the first and second U-shaped grooves. Lifting holes are provided at the corners of the first and second U-shaped grooves on the side corresponding to the U-shaped groove.

[0023] The overturning lifting device formed by the aforementioned first U-shaped groove, second U-shaped groove, and a detachable bolt has a U-shaped groove on one side of the opening of the second U-shaped groove, and corresponding connection openings on one side of the opening of the first U-shaped groove and both sides of the U-shaped groove. This allows the side of the opening of the first U-shaped groove corresponding to the U-shaped groove to enter the U-shaped groove, so that only one detachable bolt is needed to connect and fix the first U-shaped groove and the second U-shaped groove. Furthermore, the use of the first U-shaped groove to enter the U-shaped groove ensures the stability of the connection. Compared to the need for multiple detachable bolts, its installation and disassembly are simpler, which is beneficial to improving the efficiency of use.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] 1. This utility model provides a rotatable welding platform for the main weld of a bridge deck grid beam crossbeam. It is fixed by a base arranged along a first direction, enabling stable support of vertically distributed support mechanisms along the first direction. This allows for stable support of different parts of the rotating support structure along the first direction. The rotating support structure has several rectangular openings spaced along the first direction. Each opening can simultaneously accommodate the protruding portion of the corresponding upper or lower node plate of the crossbeam's side flange, allowing the openings and the protruding portions of the upper or lower node plates of the crossbeam to cooperate with each other. This allows the rotating support structure to provide stable support and lateral restraint for the crossbeam. The rotating support structure is connected to the top of each of the vertical support mechanisms via a rotating shaft along the first direction. This allows the crossbeam, when placed on the rotating support structure, to rotate stably left and right along the lateral direction. The hollow structure of the rotating support structure can restrain and stabilize the inclined crossbeam, reducing disturbance to the weld and thus enabling better welding of the crossbeam, improving welding quality. Moreover, this rotation method requires less space than simply turning and flipping the gantry crane.

[0026] 2. This utility model provides a rotatable welding system for the main weld of a bridge deck grid beam crossbeam. The rotatable welding platform provides stable support and lateral restraint for the crossbeam. By clamping the upper and lower sides of the flange plate on the same lateral side of the crossbeam with a tilting lifting device, the crossbeam can be raised on that side by applying force through all the tilting lifting devices. Then, under the weight of the crossbeam, the other side of the crossbeam presses against the corresponding side of the rotating support structure, allowing the crossbeam and the rotating support structure to rotate as a whole around the axis of rotation. This allows the crossbeam to maintain its tilt and be stably supported. This tilted state meets the welding requirements of the crossbeam weld, reduces the space requirement, and ensures that the weld is not disturbed, thus greatly improving its welding quality. Attached Figure Description

[0027] Figure 1 This is a front view of the rotatable welding platform for the main weld seams of the bridge deck grid beam crossbeams.

[0028] Figure 2 for Figure 1 The left or right view;

[0029] Figure 3 for Figure 1 Top view;

[0030] Figure 4 for Figure 1 Axonometric view;

[0031] Figure 5 for Figure 4 A magnified view of a portion of circle A in the middle;

[0032] Figure 6 A schematic diagram showing the operational status of the rotatable welding system for the main weld seams of the bridge deck grid beam crossbeams;

[0033] Figure 7 This is a schematic diagram of the assembly of the turning and lifting device;

[0034] Figure 8 This is a diagram showing the disassembly of the turning and lifting device.

[0035] The markings in the diagram are: 1. Base plate; 2. Vertical support mechanism; 3. Rotary support structure; 301. Hollowed-out; 31. Horizontal connection; 32. Longitudinal connection; 33. X-brace; 4. Rotating shaft; 5. Crossbeam; 51. Upper node plate; 52. Lower node plate; 6. Stiffening plate; 7. Turning lifting device; 71. First U-shaped groove; 72. Second U-shaped groove; 721. U-shaped groove; 722. Connecting opening; 723. Lifting hole; 8. Lifting rope. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0037] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0038] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0039] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0040] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0041] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0042] Example 1

[0043] like Figures 1-6 As shown, the rotatable welding platform for the main weld of the crossbeam of the bridge deck grid beam includes: a base, several vertical support mechanisms 2 and a rotating support structure 3.

[0044] In this embodiment, the base is arranged along the first direction and can be fixed. The base can be fixed to the ground by means of screws or other fasteners, as long as the base is stable after it is fixed.

[0045] In optional implementations, such as Figure 1 As shown, the base includes a base plate 1 corresponding to the number of vertical support mechanisms 2. The bottom of each vertical support mechanism 2 is fixed to the corresponding base plate 1. The base plate 1 can be fixed, which can reduce costs while ensuring support stability.

[0046] In this embodiment, all the vertical support mechanisms 2 are arranged vertically, and all the vertical support mechanisms 2 are distributed at intervals along the first direction. The vertical support mechanisms 2 are fixed to the top of the base. The vertical support mechanisms 2 and the top of the base can be fixed with existing fasteners. When both the vertical support mechanisms 2 and the base are steel structures, they can be fixed by welding.

[0047] In an optional embodiment, the vertical support mechanism 2 is a column, providing strong vertical support. Furthermore, the bottom of the column is welded to the top surface of the base plate 1, and a stiffening plate 6 is welded between the side of the column and the top surface of the base plate 1. The stiffening plate 6 enhances the connection strength between the column and the base plate 1, thereby increasing the support capacity. Further, as... Figure 2 and Figure 5 As shown, stiffening plates 6 are welded to the top surface of the base plate 1 on both sides of the column in the first direction, which can better resist the gravity of the rotating support structure 3 after rotating around the rotating shaft 4 on the vertical support mechanism 2. The column is a plate, which is arranged in the transverse direction of the rotating support structure 3, which facilitates the installation of the rotating shaft 4 and the stiffening plates 6.

[0048] In this embodiment, as Figure 1 and Figure 3 As shown, the rotating support structure 3 is arranged along the first direction and is located directly above all the vertical support mechanisms 2. The rotating support structure 3 is rotatably connected to the top of each vertical support mechanism 2 via a rotating shaft 4 along the first direction. The vertical support mechanisms 2, spaced apart along the first direction, can provide stable support to different parts of the rotating support structure 3 in the first direction. Figures 1-5 As shown.

[0049] like Figure 3 As shown, the rotary support structure 3 has several rectangular cutouts 301 spaced apart in the first direction. Each cutout 301 can simultaneously accommodate the protruding portion of the corresponding upper node plate 51 or lower node plate 52 of the flange plates on both sides of the inserted crossbeam 5, such as... Figure 6As shown, the hollow 301 and the protruding parts of the upper node plate 51 or lower node plate 52 of the crossbeam 5 can cooperate with each other, so that the rotating support structure 3 can stably support and laterally limit the crossbeam 5; and the rotating support structure 3 is rotatably connected to the top of each of the vertical support mechanisms 2 through a rotating shaft 4 along the first direction, so that after the crossbeam 5 is placed on the rotating support structure 3, it can stably rotate vertically left and right around the rotating shaft 4, and the hollow 301 of the rotating support structure 3 can limit and stably support the inclined crossbeam 5, such as Figure 6 As shown, this reduces disturbance to the weld, thus enabling better welding of the crossbeam 5 and improving welding quality. Furthermore, this rotation method requires less space compared to simply turning and flipping the gantry crane.

[0050] In an optional embodiment, the rotating shaft 4 is an adjusting bolt, which is low in cost and provides stable rotation.

[0051] In an optional embodiment, the rotational support structure 3 has a length of 40m-50m in the first direction, which can be used to support a 40m-50m crossbeam, ensuring stable support and lateral restraint for the crossbeam.

[0052] In optional implementations, such as Figure 3 As shown, the rotating support structure 3 includes two longitudinal connections 32 and several transverse connections 31. Both longitudinal connections 32 are arranged along a first direction, and all transverse connections 31 are spaced apart along the first direction. All transverse connections 31 are connected between the two longitudinal connections 32. The rotating support structure 3 is formed by the combination of two longitudinal connections 32 and several transverse connections 31, resulting in low cost and light weight. This is beneficial for the strength design of the vertical support mechanism 2 and the rotating shaft 4, and can significantly reduce costs. The transverse connections 31 provide installation conditions for the rotatable connection between the vertical support mechanism 2 and the rotating support structure 3 via the rotating shaft 4. This allows the axial center of a portion of the transverse connections 31 to be rotatably connected to the top of the corresponding vertical support mechanism 2 via the corresponding rotating shaft 4, enabling the rotating support structure 3 to rotate vertically about the rotating shaft 4 on the vertical support mechanism 2 along the width direction of the rotating support structure 3. The perforation 301 is formed by the cooperation of two adjacent transverse connections 31 and the longitudinal connection 32, which can better adapt to the distance between two adjacent upper node plates 51 and two adjacent lower node plates 52 in the width direction of the beam 5, such as... Figure 5As shown, the distance between two adjacent lower node plates 52 in the width direction of the crossbeam 5 is adapted to the distance between the inner sides of two adjacent longitudinal connections 32, so that two adjacent lower node plates 52 in the width direction of the crossbeam 5 can be inserted between the inner sides of two adjacent longitudinal connections 32, and can rely on the inner sides of two adjacent longitudinal connections 32 to laterally limit the outer sides of two adjacent lower node plates 52. This allows the rotating support structure 3 to better support and laterally limit the crossbeam 5, which helps to reduce disturbance to the crossbeam weld and improve welding quality.

[0053] Furthermore, the transverse connection 31 is a rod, which is lightweight. Except for the two adjacent transverse connections 31 of the hollow 301, the other adjacent transverse connections 31 are connected by X-braces 33, which can enhance the connection between adjacent transverse connections 31 and the strength between transverse connections 31 and longitudinal connections 32. This can better ensure the support and transverse restraint of the beam 5, reduce disturbance to the beam weld, and improve welding quality.

[0054] In an optional embodiment, the length of the cutout 301 in the first direction is greater than the protruding portion of the corresponding upper node plate 51 and lower node plate 52, which facilitates the hoisting of the crossbeam onto the rotating support structure 3, so that the protruding portion of the upper node plate 51 or the lower node plate 52 can smoothly enter the cutout 301 of the rotating support structure 3.

[0055] In existing technologies, under conditions of tight schedules, limited space, and busy gantry crane operations, thin-plate components such as ultra-long crossbeams (I-beams) of bridge deck grid beams cannot be turned around, are difficult to flip, have a high risk factor, and suffer from obvious clamping marks, severe deformation (poor manufacturing precision), weld disturbance (high local stress), and unreliable welding quality due to direct welding on the top and bottom flange plates. This renders traditional fixed inclined welding platforms unsuitable. Compared to the shortcomings of traditional fixed inclined welding platforms, such as direct welding, gantry crane clamping, weld disturbance due to bottom flange plate flipping, high risk factor, long welding cycle, cumbersome process, high cost, and difficulty in controlling deformation of the top and bottom flange plates or web plates, the rotating welding platform for the main weld of ultra-long crossbeams of bridge deck grid beams described in this utility model has a simple and reasonable structure, is easy to install and disassemble, has flexible usage methods, and high overall stability. It can complete the welding of the main weld on one side of the crossbeam without multiple "turns," offering advantages such as convenient construction, safety, speed, and shortened construction period.

[0056] Example 2

[0057] This embodiment provides a rotatable welding system for the main weld seam of a bridge deck grid beam crossbeam, including several turning lifting devices 7 and a rotatable welding platform for the main weld seam of the bridge deck grid beam crossbeam. The turning lifting devices 7 can clamp the upper and lower sides of the flange plates on the same lateral side of the crossbeam 5. The rotating support structure 3 of the rotatable welding platform for the main weld seam of the bridge deck grid beam crossbeam can provide stable support and lateral limitation for the crossbeam 5. By clamping the upper and lower sides of the flange plates on the same lateral side of the crossbeam 5 with the turning lifting devices 7, as... Figure 6 As shown, a turning device 7 is installed on the right flange plate, allowing force to be applied through all the turning devices 7 to raise that side of the crossbeam 5. Then, under the weight of the crossbeam 5, the other side of the crossbeam 5 presses against the corresponding side of the rotating support structure 3, enabling the crossbeam 5 and the rotating support structure 3 to rotate as a whole around the axis of rotation. This allows the crossbeam 5 to remain tilted and stably supported, and this tilted state meets the welding requirements of the crossbeam weld, reducing the space requirements; it also ensures that the weld is not disturbed, thus greatly improving its welding quality. In other words, when used with the detachable turning device 7, this rotatable welding platform can achieve rapid and safe rotation and turning of the crossbeam.

[0058] In an optional embodiment, all the turning and lifting devices 7 are engaged on the upper and lower sides of the flange plate on the same transverse side of the crossbeam 5, and are spaced apart and evenly arranged along the first direction, i.e., the longitudinal direction of the crossbeam. Furthermore, a total of three turning and lifting devices 7 are used, and the three turning and lifting devices 7 are respectively arranged at both ends and the middle of the longitudinal direction of the crossbeam.

[0059] In an optional embodiment, the turning lifting device 7 is connected to the lifting rope 8. Force is applied to the turning lifting device 7 by a gantry crane or other crane, so that force can be applied to one side of the crossbeam 5 in the lateral direction, so that the other side of the crossbeam 5 presses down on the corresponding side of the rotating support structure 3, so that the crossbeam 5 and the rotating support structure 3 can rotate as a whole around the axis of rotation.

[0060] In optional implementations, such as Figures 6-8As shown, the turning and lifting device 7 includes a first U-shaped groove 71, a second U-shaped groove 72, and a detachable bolt. The opening widths of the first U-shaped groove 71 and the second U-shaped groove 72 are both adapted to the thickness of the flange plate of the crossbeam 5. A U-shaped groove 721 is provided on one side of the opening of the second U-shaped groove 72. Corresponding connecting holes 722 are provided on one side of the opening of the first U-shaped groove 71 and on both sides of the U-shaped groove 721. The detachable bolt is inserted into the corresponding connecting hole 722 to connect and fix the first U-shaped groove 71 and the second U-shaped groove 72. The overturning lifting device 7, formed by the first U-shaped groove 71, the second U-shaped groove 72, and a detachable bolt, has a U-shaped groove 721 on one side of the opening of the second U-shaped groove 72. Corresponding connecting holes 722 are provided on one side of the opening of the first U-shaped groove 71 corresponding to the U-shaped groove 721 and on both sides of the U-shaped groove 721. This allows the opening of the first U-shaped groove 71 to enter the U-shaped groove 721, enabling the first U-shaped groove 71 and the second U-shaped groove 72 to be connected and fixed with only one detachable bolt. Compared to requiring multiple detachable bolts, this method simplifies installation and disassembly, improving efficiency. Besides this lifting device, other existing lifting devices can also be used, as long as they can be stably secured to the upper and lower sides of the flange plate on one side of the crossbeam. Lifting holes 723 are provided at the corners of the first U-shaped groove 71 and the second U-shaped groove 72 corresponding to the U-shaped groove 721, ensuring stability during lifting.

[0061] To address the challenges of repeatedly turning and flipping ultra-long I-beams under conditions of limited space and heavy gantry crane operation, including issues such as direct clamping of the top by the gantry crane hook, obvious clamping marks on the bottom flange, severe deformation, high risk, high local stress in the weld, and difficulty in ensuring weld quality, this utility model provides a rotatable welding platform and system for the main weld of the crossbeam of a bridge deck grid beam. This system utilizes a movable welding platform for the main weld between the web and the top and bottom flanges of the crossbeam, combined with a detachable turning lifting device 7, to achieve rapid welding and safe turning. It greatly leverages the ease of installation and disassembly, simple structure, and reasonable force distribution of the rotatable welding platform and the turning hoist 7, avoiding skewed pulling and lifting during "turning around," improving welding efficiency, and shortening the construction period. At the same time, it reduces the difficulty and danger of direct turning, avoids weld disturbance, controls deformation of the top and bottom flange plates or web plates, and improves manufacturing precision. It plays a positive role in reducing manual labor and gantry crane workload, reducing human and machine costs, improving manufacturing precision, shortening the construction period, and ensuring safety and reliability. It is especially suitable for situations where thin plates such as bridge deck grid beams and ultra-long crossbeams (I-beams) are easily deformed, the space is limited, turning around is difficult when welding the main weld, the turning risk factor is high, and directly clamping the flanges of the top and bottom flange plates leads to obvious clamping marks, severe deformation (poor manufacturing precision), and weld disturbance (welding quality cannot be guaranteed).

[0062] In this utility model, taking a crossbeam length of 43m as an example, the rotatable platform is decomposed into 8 base plates, 8 columns, 16 stiffening plates, 14 longitudinal rods (forming two longitudinal connections), 8 transverse connections, 8 adjusting bolts, 16 anti-deformation X-braces, and other parts; the turning hoist is decomposed into a first U-shaped groove 71, a second U-shaped groove 72, and a detachable bolt; detailed drawings of the parts are drawn, and materials are nested and cut according to the drawings.

[0063] Manufacturing method of rotatable welding platform: According to the planned beam welding area: anchor one base plate every 6m on the concrete ground. On the base plate, weld columns, stiffening plates, and end transverse connections sequentially. Two parallel longitudinal connections are set between each end transverse connection, and several intermediate transverse connections are set between the longitudinal connections. For each column, a hole is drilled in the middle of the transverse connection and fixed to the top of the column using adjusting bolts. One column is set every 6m. The remaining components are welded together. The base plate and columns are connected by stiffening plates welded together. Anti-deformation X-braces are installed between the longitudinal and transverse connections to increase overall stability and prevent platform deformation.

[0064] How to use the rotatable welding platform: After the extra-long crossbeam is assembled and qualified (the flange plates and web plates are spot-welded to form a whole), it is lifted onto the rotatable welding platform at three equal divisions by two gantry cranes. The protruding parts of the upper and lower node plates of the crossbeam are inserted into the hollow platform. With a slight external force, the crossbeam can be tilted and stabilized under its own weight. The submerged arc welding machine is then set up on the web plate of the crossbeam to start welding the main weld between the web plate and the bottom flange plate of the crossbeam. After the main weld is completed, it can be rotated 45° to another direction with a slight external force to start welding the main weld between the web plate and the top flange plate of the crossbeam.

[0065] Instructions for using the flipping lifting device: The main weld of the extra-long crossbeam is designed as a full penetration fillet weld. After one side is welded, it needs to be flipped over to clean the root and then perform multi-layer, multi-pass submerged arc welding until the welding is completed. The specific flipping method is as follows: The first U-shaped channel 71 and the second U-shaped channel 72 are clamped to the upper and lower flanges of the bottom flange plate. Two connecting plates are welded to one half of the end of the second U-shaped channel 72. The two connecting plates are drilled with holes (connecting holes 722) at the end of the first U-shaped channel 71. The adjusting bolts are fixed and locked through the holes. The holes (lifting holes 723) at the turning points of the first U-shaped channel 71 and the second U-shaped channel 72 are passed through the shackles. The wire rope (lifting rope 8) is locked through the shackles. The gantry crane moves and moves the wire rope upward to complete the flipping. Welding is then performed after flipping.

[0066] Simplified calculation of the turning hoist: Based on the maximum lifting weight of the main beam of the project being about 20T, the location of the maximum stress under the most unfavorable working condition is calculated to be at the turning point of the first U-shaped groove 71 and the second U-shaped groove 72, with a maximum stress of 226MPa. According to the relevant specifications, the limit state should be <345MPa, thus meeting the requirements.

[0067] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotatable welding platform for the main weld seam of a bridge deck grid beam crossbeam, characterized in that, include: A base, wherein the base is disposed along a first direction and the base is capable of being fixed; A plurality of vertical support mechanisms (2), all of which are vertically arranged and distributed at intervals along a first direction, and the vertical support mechanisms (2) are fixed to the top of the base; A rotating support structure (3) is provided along a first direction. The rotating support structure (3) is located directly above all the vertical support mechanisms (2). The rotating support structure (3) is rotatably connected to the top of each of the vertical support mechanisms (2) through a rotating shaft (4) along the first direction. The rotating support structure (3) is provided with a number of rectangular cutouts (301) at intervals in the first direction. Each cutout (301) can be used to simultaneously adapt to the protruding part of the corresponding upper node plate (51) or lower node plate (52) of the flange plates on both sides of the inserted beam (5).

2. The rotatable welding platform for the main weld of the crossbeam of the bridge deck grid beam according to claim 1, characterized in that, The rotating support structure (3) includes two longitudinal connections (32) and several transverse connections (31). The two longitudinal connections (32) are arranged along the first direction, and all the transverse connections (31) are spaced apart along the first direction. All the transverse connections (31) are connected between the two longitudinal connections (32). The middle part of a portion of the transverse connections (31) is rotatably connected to the top of the corresponding vertical support mechanism (2) through the corresponding pivot (4). The hollow (301) is formed by a portion of two adjacent transverse connections (31) cooperating with the longitudinal connections (32). The gap width between the two longitudinal connections (32) is adapted to the distance between two adjacent upper node plates (51) and two adjacent lower node plates (52) in the width direction of the beam (5).

3. The rotatable welding platform for the main weld of the crossbeam of the bridge deck grid beam according to claim 2, characterized in that, The transverse connection (31) is a rod. Except for the two adjacent transverse connections (31) of the hollow (301), the other two adjacent transverse connections (31) are connected by X-braces (33).

4. The rotatable welding platform for the main weld of the crossbeam of the bridge deck grid beam according to claim 1, characterized in that, The base includes base plates (1) corresponding to the number of vertical support mechanisms (2), and the bottom of each vertical support mechanism (2) is fixed to the corresponding base plate (1), and the base plate (1) can be fixed.

5. A rotatable welding platform for the main weld seam of a bridge deck grid beam crossbeam according to claim 4, characterized in that, The vertical support mechanism (2) is a column.

6. A rotatable welding platform for the main weld seam of a bridge deck grid beam crossbeam according to claim 5, characterized in that, The bottom of the column is welded to the top surface of the base plate (1), and a stiffening plate (6) is welded between the side of the column and the top surface of the base plate (1).

7. A rotatable welding platform for the main weld seam of a bridge deck grid beam crossbeam according to claim 6, characterized in that, The stiffening plates (6) are welded to the top surface of the base plate (1) on both sides of the column in the first direction. The column is a plate and the plate is arranged in the transverse direction along the rotating support structure (3).

8. A rotatable welding platform for the main weld seam of a bridge deck grid beam crossbeam according to claim 1, characterized in that, The length of the rotating support structure (3) in the first direction is 40m-50m, and the length of the hollow (301) in the first direction is greater than the protruding parts of the corresponding upper node plate (51) and lower node plate (52); And / or, the rotating shaft (4) is an adjusting bolt.

9. A rotatable welding system for the main weld seams of the crossbeams of a bridge deck grid beam, characterized in that, It includes several turning and lifting devices (7) and a rotatable welding platform for the main weld of the crossbeam of the bridge deck grid beam as described in any one of claims 1-8. The turning and lifting devices (7) are capable of locking the upper and lower sides of the flange plate on the same side of the crossbeam (5) in the transverse direction.

10. A rotatable welding system for the main weld of a bridge deck grid beam crossbeam according to claim 9, characterized in that, The turning hoist (7) includes a first U-shaped groove (71), a second U-shaped groove (72), and a detachable bolt. The opening widths of the first U-shaped groove (71) and the second U-shaped groove (72) are adapted to the thickness of the flange plate of the crossbeam (5). A U-shaped groove (721) is provided on one side of the opening of the second U-shaped groove (72). A corresponding connecting hole (722) is provided on one side of the opening of the first U-shaped groove (71) and on both sides of the U-shaped groove (721). The detachable bolt is inserted into the corresponding connecting hole (722) to connect and fix the first U-shaped groove (71) and the second U-shaped groove (72). A hoisting hole (723) is provided at the corner of the first U-shaped groove (71) and the second U-shaped groove (72) corresponding to the setting side of the U-shaped groove (721).

Images