Steel box girder formwork welding positioning device

Abstract

The utility model belongs to steel box girder plate welding technical field especially relates to a kind of steel box girder template welding positioning device.A kind of steel box girder template welding positioning device, including support frame, be provided with multiple positioning blocks on the support frame;Fixed frame is provided with in the support frame both ends along roof width direction, and multiple sets of positioning components are provided on the fixed frame;The positioning component includes fixed seat fixedly connected on the fixed frame, rotatablely connected positioning frame on the fixed seat, and the positioning frame includes two positioning plates oppositely arranged and rotatably connected on fixed seat, and connecting plate is fixedly connected on two positioning plates;The positioning component is pairwise oppositely arranged on the both sides of roof, when the positioning frame rotates and the positioning plate is located above roof, U-shaped rib plate can be lifted and embedded between two positioning plates to complete positioning.The utility model structure and use are simple, use cost is low and can be convenient for U-shaped rib plate to be positioned before welding.

Description

Technical Field

[0001] This utility model belongs to the field of steel box girder welding technology, and in particular relates to a steel box girder template welding positioning device. Background Technology

[0002] like Figure 1 The existing steel box girder formwork 1 shown is a common structural form for long-span bridges, generally used on bridges with large spans. The steel box girder formwork 1 includes a planar plate-like top plate 11 and U-shaped ribs 12 welded along the length of the top plate 11. The U-shaped ribs 12 are U-shaped structures with their openings welded to the top plate 11. Multiple sets of U-shaped ribs 12 are arranged in parallel according to actual needs.

[0003] In the process of welding the U-shaped rib 12 to the top plate 11, the top plate 11 first needs to be fixed and positioned on the welding table. Then, auxiliary lines are drawn on the top plate 11 manually. Next, the U-shaped rib 12 is lifted by hoisting equipment, aligned with the auxiliary lines, and placed on the top plate 11. Due to the low efficiency of manual auxiliary line drawing, current methods often use a gantry welding frame on the welding table that slides along the length of the top plate 11 to draw the auxiliary lines. Whether the auxiliary lines are drawn manually or automatically using a gantry welding frame, during the assembly of the U-shaped rib 12 along the auxiliary lines onto the top plate 11, manual movement of the U-shaped rib 12 is still required, wasting manpower and resulting in inaccurate placement, affecting the actual processing quality.

[0004] In the prior art, the positioning devices for welding steel box girder templates are mostly concentrated on aligning the U-shaped rib plate 12 with the auxiliary line and then fixing and positioning the U-shaped rib plate 12 by pressing or other methods. For example, Chinese utility model patent with authorization announcement number CN215393481U discloses a workpiece positioning and fixing device for welding steel box girder templates. It uses a limiting mechanism to adjust the position of the pressing shell and uses an electric cylinder to drive the pressing shell to clamp and fix the second template with the help of a buffer mechanism, thereby facilitating the welding of the steel box girder template.

[0005] Regarding patents concerning the splicing and welding positioning of U-shaped ribs 12 on the top plate 11, such as the Chinese utility model patent with authorization announcement number CN202528089U, which discloses a bridge U-rib assembly end positioning mechanism, the U-rib assembly end positioning mechanism includes a manual positioning connecting frame, a linear slider, a tie rod cylinder, a cylinder mounting frame, a connecting sleeve, a cylinder pressure block, a connecting rod, a connecting plate, a first positioning plate, and a second positioning plate. This utility model adjusts the first and second positioning plates to accommodate U-ribs of different sizes. The extension and retraction of the piston rod drives the cylinder pressure block to clamp the U-rib, and due to the U-rib's own weight, it automatically adjusts to a horizontal position along the linear slide rail, achieving bottom positioning. The structure is simple, compact, and reasonable; operation is convenient and quick, improving work efficiency.

[0006] This patent uses the extension and retraction of a piston rod to drive a hydraulic cylinder block, identical to the U-rib structure, to clamp the U-rib, thereby driving the U-rib to move along a set position to complete the positioning. However, its structure and operation are relatively complex, and the cost of use is high. In addition, since the welding of the U-shaped rib plate 12 currently mostly uses a gantry welding frame (with a welding device installed on the gantry frame), if the above-mentioned patent structure is used, the gantry welding frame will need to be modified, making it even more inconvenient to use. Utility Model Content

[0007] To address the technical problems existing in the prior art, this application provides a steel box girder template welding positioning device that is simple in structure and use, has low operating cost, and facilitates pre-welding positioning of U-shaped ribs.

[0008] To achieve the above objectives, this utility model provides the following technical solution: A steel box girder formwork welding positioning device includes a support frame with multiple positioning blocks on the support frame. A top plate can be embedded in the support frame within the positioning blocks to complete positioning. Fixed frames are provided at both ends of the support frame along the width direction of the top plate, and multiple sets of positioning components are provided on the fixed frames. Each positioning component includes a fixed seat fixedly connected to the fixed frame and a positioning frame rotatably connected to the fixed seat. Each positioning frame includes two opposing positioning plates rotatably connected to the fixed seat and a connecting plate fixedly connected to the two positioning plates. The positioning components are arranged opposite each other on both sides of the top plate. When the positioning frame rotates to the position of the positioning plate above the top plate, a U-shaped rib can be lifted and embedded between the two positioning plates to complete positioning.

[0009] Preferably, each group of positioning components is provided with two fixed seats, and the two positioning plates are rotatably connected to the two fixed seats by rotating shafts respectively; the fixed seats can be slidably arranged on the fixed frame along the length direction of the fixed frame, and the fixed seats are fixedly connected to the fixed frame by fastening bolts.

[0010] Preferably, the fixing frame has an I-shaped structure, and the fixing seat includes a connecting seat that can be slidably sleeved on the fixing frame and a rotating seat that is fixedly connected to the upper end face of the connecting seat. The positioning plate is rotatably connected to the rotating seat through a rotating shaft. The fastening bolt is rotatably inserted into the connecting seat and passes through the fixing frame before being connected by a fastening nut to fix the fixing seat on the fixing frame.

[0011] Preferably, the fixing frame has a plurality of positioning through holes along its length, and the fastening bolts can be inserted into the corresponding positioning through holes; the connecting plate includes a fixing plate fixedly connected to two positioning plates respectively along the length of the fixing frame, and an adjusting plate detachably fixedly connected to the two fixing plates.

[0012] Preferably, the adjusting plate has multiple adjusting through holes along its length, adjusting bolts are inserted into the corresponding adjusting through holes and the fixing plate, and adjusting nuts are threaded onto the adjusting bolts to fix the adjusting plate to the fixing plate.

[0013] Preferably, a guide plate facing outward is fixedly connected to the upper surface of the positioning plate near the top plate, and the guide plate is arranged along the length direction of the positioning plate.

[0014] Preferably, handles are fixedly connected to the outer side of the guide plate and the connecting plate respectively.

[0015] Preferably, each of the rotating seats has a vertically formed waist-shaped rotating through hole, and the rotating shaft is rotatable and can slide up and down through the rotating through hole; the positioning frame can be rotated to a horizontal state to position the U-shaped rib, and can also be rotated to a vertical state to detach from the steel box girder template.

[0016] Preferably, a limiting groove is provided on the upper end face of the rotating seat. After the positioning frame rotates to the vertical state, the positioning frame falls down along the length direction of the rotating through hole so that the connecting plate is embedded in the limiting groove.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model uses positioning blocks on a support frame to position the top plate, and simultaneously utilizes a flip-up positioning frame to constrain the U-shaped ribs in the width direction of the top plate, achieving rapid and precise alignment between the top plate and the U-shaped ribs. This avoids the errors caused by traditional manual marking and positioning, ensures the accuracy of the welding position of the U-shaped ribs, and thus significantly improves the overall welding quality and structural strength of the steel box girder.

[0018] 2. The positioning block of this utility model is adjustable in position on the longitudinal support frame to accommodate top plates of different widths; the fixing seat can slide and lock along the length of the fixing frame to accommodate U-shaped ribs of different spacings; the distance between the two positioning plates of the positioning frame can be adjusted by the connecting plate to accommodate U-shaped ribs of different widths. It can meet the welding requirements of steel box girder formwork of various specifications, greatly improving the utilization rate and economy of the equipment.

[0019] 3. The oblique notch on the positioning block facilitates the rapid introduction of the top plate, and the guide plate on the positioning frame makes the hoisting and placement of the U-shaped rib plate smoother; the positioning frame can be easily flipped using the handle. The entire positioning process eliminates the need for repeated measurements and markings, transforming tedious manual positioning into efficient tooling operations, significantly reducing the labor intensity of operators, shortening the production preparation time for individual workpieces, and improving production efficiency.

[0020] 4. By incorporating a waist-shaped rotating through-hole and limiting groove, the positioning frame can be vertically stored and self-locked onto the fixed frame when not in operation. This not only prevents the positioning frame from interfering with the movement trajectory of welding equipment (such as automatic gantry welding machines), providing ample and unobstructed space for welding operations, but also reduces the floor space occupied by on-site equipment, while lowering safety hazards caused by collisions, making the work process safer and smoother. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of the positioning of the steel box girder template in an embodiment of the present invention.

[0022] Figure 2 for Figure 1 A top-view structural diagram.

[0023] Figure 3 This is a structural schematic diagram of an embodiment of the present invention when the steel box girder template is not positioned.

[0024] Figure 4 This is a schematic diagram of the positioning components in embodiments 1 and 2 of this utility model.

[0025] Figure 5 This is a schematic diagram of the connection structure of the fixing frame and fixing seat in embodiments 1 and 2 of this utility model.

[0026] Figure 6 This is a schematic diagram of the positioning frame according to an embodiment of the present utility model.

[0027] Figure 7 This is a schematic diagram of the positioning component in Embodiment 3 of this utility model.

[0028] Figure 8 This is a schematic diagram of the structure of the fixing seat in Embodiment 3 of this utility model.

[0029] Figure 9 This is a schematic diagram of the positioning frame in the vertical state according to Embodiment 3 of this utility model.

[0030] In the diagram: 1. Steel box girder formwork; 11. Top slab; 12. U-shaped ribs. 2. Support frame; 21. Horizontal support frame; 22. Longitudinal support frame. 3. Positioning block; 31. Angled notch; 4. Positioning components 41. Fixed base; 411. Connecting base; 4111. T-shaped slot; 412. Rotating base; 4121. Rotating through hole; 4122. Limiting groove; 413. Fastening bolt. 42. Positioning bracket; 421. Positioning plate; 422. Connecting plate; 423. Rotating shaft; 424. Guide plate; 425. Handle; 426. Fixing plate; 427. Adjusting plate; 4271. Adjusting through hole; 428. Adjusting bolt; 4281. Adjusting nut. 5. Fixing bracket; 51. First horizontal plate; 52. Vertical plate; 53. Second horizontal plate; 54. Positioning through hole. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0033] See appendix Figure 1 , 2 As shown in Figures 1 and 3, a steel box girder formwork welding positioning device includes a support frame 2 for supporting the top plate 11, a positioning block 3 for positioning the top plate 11, a positioning component 4 for positioning the U-shaped rib plate 12, and a fixing frame 5 for supporting and fixing the positioning component 4.

[0034] Specifically, the support frame 2 includes horizontally arranged and crisscrossed transverse support frames 21 and longitudinal support frames 22. The transverse support frames 21 are arranged along the length of the top plate 11 and multiple sets can be arranged. The longitudinal support frames 22 are arranged along the width of the top plate 11 and multiple sets can be arranged. Positioning blocks 3 can be detachably connected to the upper end face of the transverse support frames 21 and longitudinal support frames 22 by bolts or by welding according to the size of the top plate 11. That is, when the top plate 11 is hoisted onto the transverse support frames 21 and longitudinal support frames 22 embedded in the inner side of each positioning block 3, the positioning of the top plate 11 is completed. At this time, the outer side of the top plate 11 can abut against the inner side of the corresponding positioning block 3 or leave a certain gap within the positioning error range.

[0035] To facilitate the embedding of the top plate 11 into the support frame 2 within the positioning block 3 for positioning, an inwardly oriented oblique notch 31 is provided on the upper surface of the positioning block 3, through which the top plate 11 enters the inner side of the positioning block 3. In this embodiment, both the transverse support frame 21 and the longitudinal support frame 22 are existing I-beam structures.

[0036] The fixing frame 5 is arranged parallel to the longitudinal support frame 22, that is, it is arranged at both ends of the support frame 2 along the width direction of the top plate 11. Multiple sets of positioning components 4 are arranged on the fixing frame 5 according to the number of U-shaped ribs 12 to be welded on the top plate 11. The fixing frame 5 is arranged on the outside of the transverse support frame 21, and it can also be an existing I-beam structure. For the convenience of the following structural description, the fixing frame 5 includes a first horizontal plate 51, a vertical plate 52 fixedly connected to the first horizontal plate 51, and a second horizontal plate 53 fixedly connected to the vertical plate 52.

[0037] See appendix Figure 4 , 5 As shown, the positioning component 4 includes a fixed base 41 fixedly connected to the fixed frame 5 and a positioning frame 42 rotatably connected to the fixed base 41. The positioning frame 42 includes two positioning plates 421 that are arranged opposite to each other and rotatably connected to the fixed base, and a connecting plate 422 fixedly connected to the two positioning plates 421. The positioning component 4 is arranged opposite to each other on both sides of the top plate 11. When the positioning frame 42 rotates to the position plate 421 above the top plate 11, the U-shaped rib plate 12 can be lifted and embedded between the two positioning plates 421 to complete the positioning.

[0038] Specifically, each positioning assembly 4 is provided with two fixed seats 41. The fixed seat 41 includes a connecting seat 411 that is slidably fitted onto the fixed frame 5 and a rotating seat 412 welded to the upper end face of the connecting seat 411. The connecting seat 411 is matched with the first horizontal plate 51, the vertical plate 52 and the second horizontal plate 53. That is, the connecting seat 411 has a T-shaped groove 41114111 that matches the cross-section of the I-beam of the fixed frame 5, so that it can slide along the length direction of the fixed frame 5. The connecting seat 411 is slidably fitted onto the fixed frame 5 through the T-shaped through groove. The lower part of the connecting seat 411 is embedded in the groove formed by the first horizontal plate 51, the vertical plate 52 and the second horizontal plate 53. The second horizontal plate 53 is embedded in the upper part of the T-shaped through groove of the connecting seat 411. To fix the relative position of the two fixing seats 41 in each positioning assembly 4, the fixing seats 41 are fixedly connected to the fixing frame 5 by fastening bolts 413. That is, at least one fastening bolt 413 can be threaded to the lower part of the connecting seat 411 and abut against the vertical plate 52, thereby fixing the fixing seat 41 to the fixing frame 5. In this embodiment, in order to improve the stability of the fixing seat 41 fixed to the fixing frame 5, the fastening bolt 413 can be rotatably inserted through one side of the lower part of the connecting seat 411 and through the vertical plate 52. A fastening nut (not shown in the figure) is threaded onto the fastening bolt 413 on the other side of the lower part of the connecting seat 411. Tightening the fastening nut can fix the fixing seat 41 to the fixing frame 5.

[0039] The rotating seat 412 is welded to the upper end face of the connecting seat 411. A rotating through hole 4121 is provided on the rotating seat 412, and the axis of the rotating through hole 4121 is parallel to the length direction of the fixed frame 5.

[0040] See appendix Figure 6 As shown, the positioning frame 42 includes two parallel positioning plates 421, which are perpendicular to the length direction of the fixed frame 5. A rotating shaft 423 is horizontally welded to the inner side of each positioning plate 421, and the rotating shaft 423 is rotatably inserted into the rotating through hole 4121. A connecting plate 422 is welded to the inner end face of the positioning plate 421 inside the rotating shaft 423. By setting the connecting plate 422, the connection strength between the two positioning plates 421 is improved, thereby improving the positioning accuracy of the U-shaped rib plate 12.

[0041] In order to facilitate the placement of the U-shaped rib plate 12 between the two positioning plates 421 after it is lifted, a guide plate 424 facing outward is welded to the upper surface of the positioning plate 421 near the top plate 11. The guide plate 424 is arranged along the length of the positioning plate 421.

[0042] To facilitate the flipping of the positioning frame 42, handles 425 are welded to the outer side of the guide plate 424 and the inner end face of the connecting plate 422, respectively.

[0043] The working principle and process of this embodiment are as follows: Install each component according to the above instructions, lift the top plate 11 and embed it into the support frame 2 inside the positioning block 3 through the oblique notch 31, thereby completing the positioning of the top plate 11; Then, by flipping the positioning frame 42 using handle 425, the positioning plate 421 is flipped to be positioned above the top plate 11. Preferably, through the adaptive design of the height of the fixing frame 5 and the fixing base 41, the lower end face of the positioning plate 421 can abut against the upper end face of the top plate 11. At this time, the position between the two positioning plates 421 is the position where the U-shaped rib 12 needs to be placed. Lifting the U-shaped rib 12 and placing it between the two positioning plates 421 completes the positioning of the U-shaped rib 12 along its width direction. It should be noted that the U-shaped rib 12 can abut against the inner end face of the positioning plate 421, or a gap with allowable error can be left. In addition, the position of each set of positioning components 4 and the corresponding top plate 11 are... With the dimensions matched, the position of each set of positioning components 4 is relatively fixed as the top plate 11 is positioned. Through the above description, the operation of each set of positioning components 4 is completed and the U-shaped rib plate 12 is hoisted. The two sets of positioning components 4 at both ends of each U-shaped rib plate 12 are in the same position in the width direction of the top plate 11. After the positioning of each U-shaped rib plate 12 is completed, the existing automatic gantry welding frame can be used to fix the U-shaped rib plate 12. Then, the positioning frame 42 is rotated 180° in the opposite direction to make the positioning frame 42 detach from the top plate 11. The U-shaped rib plate 12 is welded by the existing automatic gantry welding frame. Finally, the welded steel box girder template 1 is hoisted away to carry out the positioning and welding of the next steel box girder template 1. Example 2

[0044] This embodiment is a further improvement on embodiment 1. In order to weld steel box girder templates 1 of different widths, the positioning component is designed as an adjustable structure.

[0045] See appendix Figure 5 , 6 As shown, a plurality of positioning through holes 54 are provided along the length of the fixing frame 5, and the positioning through holes 54 are provided on the vertical plate 52. When it is necessary to adjust the distance between the two fixing seats 41, the fastening bolts 413 can be inserted into the corresponding positioning through holes 54 and the fixing seats 41 can be fixed to the fixing frame 5 by fastening nuts.

[0046] Corresponding to the above, the connecting plate 422 includes a fixing plate 426 welded to two positioning plates 421 along the length of the fixing frame 5, and an adjusting plate 427 detachably fixed and bridged on the two fixing plates 426.

[0047] The fixed plate 426 has a set of mounting holes, and the adjusting plate 427 has multiple sets of adjusting through holes 4271 along its length that correspond to the mounting holes on the fixed plate 426. By selecting different adjusting through holes 4271 and using adjusting bolts 428 and nuts 4281 to fix the adjusting plate 427 to the fixed plates 426 at both ends, the net distance between the two positioning plates 421 can be changed, thereby matching U-shaped ribs 12 of different widths.

[0048] In addition, the positioning block 3 can also be detachably fixed in the longitudinal support frame 22 by bolts. By adjusting the different installation positions of the positioning block 3 on the longitudinal support frame 22, the top plate 11 of different widths can be positioned.

[0049] The working principle and process of this embodiment are as follows: Install each component according to the above instructions, and adjust the position of the positioning block 3 and the fixing seat 41 according to the different widths of the top plate 11 and the different spacings of the U-shaped ribs 12, as well as adjust the distance between the two positioning plates 421. Then the top plate 11 is lifted and embedded in the support frame 2 inside the positioning block 3 through the oblique notch 31, thereby completing the positioning of the top plate 11; Then, by flipping the positioning frame 42 using handle 425, the positioning plate 421 is flipped to be positioned above the top plate 11. Preferably, through the adaptive design of the height of the fixing frame 5 and the fixing base 41, the lower end face of the positioning plate 421 can abut against the upper end face of the top plate 11. At this time, the position between the two positioning plates 421 is the position where the U-shaped rib 12 needs to be placed. Lifting the U-shaped rib 12 and placing it between the two positioning plates 421 completes the positioning of the U-shaped rib 12 along its width direction. It should be noted that the U-shaped rib 12 can abut against the inner end face of the positioning plate 421, or a gap with allowable error can be left. In addition, the position of each set of positioning components 4 and the corresponding top plate 11 are... With the dimensions matched, the position of each set of positioning components 4 is relatively fixed as the top plate 11 is positioned. Through the above description, the operation of each set of positioning components 4 is completed and the U-shaped rib plate 12 is hoisted. The two sets of positioning components 4 at both ends of each U-shaped rib plate 12 are in the same position in the width direction of the top plate 11. After the positioning of each U-shaped rib plate 12 is completed, the existing automatic gantry welding frame can be used to fix the U-shaped rib plate 12. Then, the positioning frame 42 is rotated 180° in the opposite direction to make the positioning frame 42 detach from the top plate 11. The U-shaped rib plate 12 is welded by the existing automatic gantry welding frame. Finally, the welded steel box girder template 1 is hoisted away to carry out the positioning and welding of the next steel box girder template 1. Example 3

[0050] This embodiment is a further improvement on embodiment 2, in order to facilitate the flipping and placement of the positioning frame 42.

[0051] See appendix Figure 7 ,8 As shown in Figure 9, each rotating seat 412 has a vertically formed waist-shaped rotating through hole 4121. The rotating shaft 423 is rotatable and slides up and down through the rotating through hole 4121. The positioning frame 42 can be rotated to a horizontal position to position the U-shaped rib 12, as shown in Figure 9. Figure 7 As shown, it can also be rotated to a vertical position to detach from the steel box girder formwork 1, as... Figure 9 As shown.

[0052] To facilitate the placement of the positioning frame 42 and avoid the high labor intensity caused by the 180° rotation required in Embodiment 2, a limiting groove 4122 is provided on the upper surface of the rotating seat 412. The limiting groove 4122 matches the shape of the connecting plate 422. After the positioning frame 42 rotates to the vertical position, it falls along the length of the rotating through hole 4121, causing the connecting plate 422 to be embedded in the limiting groove 4122. It is noted that the length of the rotating through hole 4121 must at least satisfy the following conditions: when the rotating shaft 423 is raised to the top of the rotating through hole 4121, the connecting plate 422 can disengage from the limiting groove 4122, allowing the positioning plate 421 to rotate around the rotating shaft 423 to abut against the upper surface of the top plate 11; when the rotating shaft 423 falls to the bottom of the rotating through hole 4121 under the action of gravity, the connecting plate 422 can be embedded in the limiting groove 4122. Therefore, by setting the waist-shaped rotating through hole 4121 and the limiting groove 4122, this embodiment can make the positioning frame 42 stand in a vertical position when not in use, thereby reducing the labor intensity of the operator.

[0053] The working principle and process of this embodiment are as follows: 1. Preparation: Adjust the installation position of the positioning block 3 on the longitudinal support frame 22 according to the width of the top plate 11 to be welded; adjust the position of the fixing seat 41 on the fixing frame 5 according to the spacing and width of the U-shaped ribs 12, and adjust the distance between the two positioning plates 421 through the connecting plate 422.

[0054] 2. Top plate positioning: Hoist the top plate 11 so that its edge slides into the oblique notch 31 of the positioning block 3 and sits stably on the support frame 2, thus completing the initial positioning of the top plate 11.

[0055] 3. Positioning the Positioning Frame: For all positioning components 4, the operator lifts and flips the positioning frame 42 to bring it into a horizontal working state. Specifically, the operator lifts the positioning frame 42 upwards using handle 425, positioning the rotating shaft 423 above the rotating through hole 4121. At this point, the connecting plate 422 disengages from the limiting groove 4122. Then, the positioning frame 42 is flipped approximately 90° towards the top plate 11 until the positioning plate 421 is horizontally positioned above the top plate 11. After releasing the handle, the positioning frame 42 falls slightly under gravity, and the lower end face of the positioning plate 421 stably abuts against the upper end face of the top plate 11.

[0056] 4. U-shaped rib positioning: Hoist the U-shaped rib 12 and, guided by the guide plate 424, accurately place it between the two opposing positioning plates 421. Once all U-shaped ribs 12 have been placed in this manner, the positioning of the U-shaped ribs 12 along their width direction is complete. It should be noted that the U-shaped rib 12 can abut against the inner end face of the positioning plate 421, or a permissible gap can be left. 5. Welding and Storage: The U-shaped rib plate 12 is fixed using external welding equipment (such as an automatic gantry welder). The operator lifts the handle 425 on the guide plate 424, flipping the positioning frame 42 approximately 90° to a vertical position, and then releases the handle. Under gravity, the rotating shaft 423 of the positioning frame 42 slides down along the rotating through hole 4121 to the bottom. At this point, the connecting plate 422 falls precisely into and is embedded in the limiting groove 4122. The limiting groove 4122 forms a circumferential constraint on the connecting plate 422, thus reliably maintaining the positioning frame 42 in a vertical storage state without the need for an additional 180° flip, making the operation more labor-saving and convenient. The U-shaped rib plate 12 is welded using an existing automatic gantry welder.

[0057] 6. Cyclic operation: Once the welded steel box girder formwork 1 is lifted off the ground, the next round of operation can begin.

[0058] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding positioning device for steel box girder formwork, comprising a support frame, characterized in that: Multiple positioning blocks are provided on the support frame, and the top plate can be embedded in the support frame within the positioning blocks to complete the positioning; fixing frames are provided at both ends of the support frame along the width direction of the top plate, and multiple sets of positioning components are provided on the fixing frames; The positioning assembly includes a fixed base fixedly connected to the fixed frame, and a positioning frame rotatably connected to the fixed base. The positioning frame includes two positioning plates arranged opposite to each other and rotatably connected to the fixed base, and a connecting plate fixedly connected to the two positioning plates. The positioning components are arranged opposite each other on both sides of the top plate. When the positioning frame is rotated to the position plate above the top plate, the U-shaped rib plate can be lifted and embedded between the two positioning plates to complete the positioning.

2. The steel box girder formwork welding positioning device according to claim 1, characterized in that: Each group of positioning components is provided with two fixed seats, and the two positioning plates are rotatably connected to the two fixed seats through rotating shafts respectively; the fixed seats can be slidably arranged on the fixed frame along the length direction of the fixed frame, and the fixed seats are fixedly connected to the fixed frame by fastening bolts.

3. The steel box girder formwork welding positioning device according to claim 2, characterized in that: The fixing frame has an I-shaped structure. The fixing seat includes a connecting seat that can be slidably sleeved on the fixing frame and a rotating seat that is fixedly connected to the upper end face of the connecting seat. The positioning plate is rotatably connected to the rotating seat through a rotating shaft. The fastening bolt is rotatably inserted into the connecting seat and passes through the fixing frame before being connected by a fastening nut to fix the fixing seat on the fixing frame.

4. The steel box girder formwork welding positioning device according to claim 3, characterized in that: The fixed frame has several positioning through holes along its length, and the fastening bolts can be inserted into the corresponding positioning through holes; the connecting plate includes a fixed plate that is fixedly connected to two positioning plates along the length of the fixed frame, and an adjusting plate that is detachably fixedly connected to the two fixed plates.

5. The steel box girder formwork welding positioning device according to claim 4, characterized in that: Multiple adjustment through holes are provided along the length of the adjustment plate. Adjustment bolts are inserted into the corresponding adjustment through holes and the fixing plate. Adjustment nuts are threaded onto the adjustment bolts to fix the adjustment plate to the fixing plate.

6. The steel box girder formwork welding positioning device according to claim 1, characterized in that: A guide plate facing outward is fixedly connected to the upper surface of the positioning plate near the top plate, and the guide plate is arranged along the length direction of the positioning plate.

7. The steel box girder formwork welding positioning device according to claim 1, characterized in that: A guide plate facing outward is fixedly connected to the upper surface of the positioning plate near the top plate, and the guide plate is arranged along the length direction of the positioning plate.

8. The steel box girder formwork welding positioning device according to claim 3, characterized in that: Each of the rotating seats has a vertically formed waist-shaped rotating through hole, and the rotating shaft can rotate and slide up and down through the rotating through hole; the positioning frame can rotate to a horizontal state to position the U-shaped rib, and can also rotate to a vertical state to detach from the steel box girder template.

9. The steel box girder formwork welding positioning device according to claim 8, characterized in that: A limiting groove is provided on the upper end face of the rotating seat. After the positioning frame rotates to the vertical position, the positioning frame falls down along the length direction of the rotating through hole so that the connecting plate is embedded in the limiting groove.

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