Channel steel transfer purlin holder steel plate field surrounding welding connection process

Abstract

The invention relates to the technical field of welding, and discloses a channel steel transfer purlin hanger steel plate field surrounding welding connection process which comprises the steps that S1, materials and welding equipment are checked in the construction preparation stage, it is guaranteed that the quality of welders is qualified, and safety protection is well conducted; s2, impurities on connecting edges are cleaned before welding, and positions are marked according to design; the clamping set is initially located at the end, away from the purlin hanger steel plate, of the limiting groove, a sufficient gap is kept between the clamping set and the steel plate, and installation interference is avoided; when the screw rod is rotated clockwise, the screw groove is matched with the screw thread of the screw rod to drive the clamping group to stably translate, so that an operator has sufficient time to observe and align; when the clamping blocks move to the tail ends of the limiting grooves, the clamping blocks are automatically aligned with the side edges of the purlin hanger steel plates, the clamping plates are gradually attached under the elastic action of the arc-shaped blocks, the arc-shaped faces of the arc-shaped blocks slide along the positioning grooves, gradual change clamping force is applied through the second connecting rods, the steel plates are prevented from plastic deformation, tight attachment is guaranteed, and flexible wrapping and rigid positioning are achieved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a field welding connection process for channel steel transition purlin support steel plates. Background Technology

[0002] In steel structure engineering, channel steel mainly serves as a secondary load-bearing component, used to bear the loads of the roof, walls, and other enclosure systems and transfer them to the main structure. It also has the functions of support, connection, and stability. The main purlins and the channel steel transition pieces in the steel structure are connected by stainless steel bolt groups. The channel steel transition pieces and the purlin support steel plates are connected by on-site welding to form a rigid node. Continuous welding integrates the transition pieces with the main structure (steel beams with pre-welded purlin support plates), realizing the full transfer of bending moment and shear force. On-site welding can eliminate installation deviations of the purlin support plates and compensate for gaps through weld size.

[0003] The roofing of the swimming and diving hall, due to its large span and heavy load characteristics, requires the channel steel transition purlin support plates to be welded to the flange surface. The flange's strong bending resistance meets the load transfer requirements of the large-span structure. To distribute the stress generated by the roof's self-weight, equipment loads, and environmental loads, multiple purlin support plates need to be welded to the same channel steel. This necessitates repeated installation and relocation of the positioning components as the purlin supports are moved, increasing the number of high-altitude operations, reducing construction efficiency, extending work time due to frequent disassembly and assembly, and increasing the risk of falls and impacts. Furthermore, the positioning components are prone to wear after repeated use, resulting in decreased fitting accuracy and larger single-positioning deviations. Repeated calibration can easily lead to cumulative errors, causing the purlin support spacing to deviate from the design value, affecting the smoothness of purlin installation. Repeated operations also reduce construction efficiency, delay the construction period, and the deviation may exacerbate stress concentration at joints, creating potential structural safety hazards. Summary of the Invention

[0004] Technical problems to be solved In view of the above-mentioned shortcomings of the existing technology, the present invention provides a field welding connection process for channel steel transition purlin support steel plates, which can effectively solve the problems of low efficiency, high risk and large deviation caused by the need for repeated installation of positioning parts for multiple purlin supports on channel steel in the existing technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a process for on-site welding connection of channel steel transition purlin support steel plates, comprising: S1. During the construction preparation stage, inspect the materials and welding equipment to ensure that the welders are qualified and that safety protection measures are in place. S2. Clean impurities from the joint edges before welding, and mark the positions according to the design; S3. Clamp the structure with positioning equipment and form a temporary fixing part by spot welding to ensure accurate positioning; S4. Set the matching welding parameters as needed for formal welding, and control the weld leg size and weld formation quality; S5. Clean the weld slag and grind the weld after welding; S6. Perform non-destructive testing, visual inspection, and dimensional verification according to design requirements; The temporary fixing part in S2 includes a channel steel, and a purlin support steel plate is welded to the top of the channel steel. The channel steel is initially fixed to the purlin support steel plate by a positioning component that is slidably connected to the top side of the channel steel. The positioning component includes a limiting group that is slidably connected to the top side of the channel steel. The top of the limiting group is provided with a locking group for initially fixing the side of the purlin support steel plate. The locking groups that are symmetrically arranged are connected by an auxiliary rod. The locking assembly includes a clamping block for locking the side of the purlin support steel plate. A positioning plate is fixedly connected to the bottom end of the clamping block, and a screw groove is provided in the middle of the bottom end of the positioning plate. The limiting assembly includes a limiting frame that is slidably connected to the top side of the channel steel. A limiting groove is opened in the middle of the top of the limiting frame. A lead screw is rotatably connected to the middle of the limiting groove. The outer wall of the lead screw is threadedly connected to the inner wall of the screw groove. The inner wall of the clamping block is slidably connected to a clamping plate that clamps the side of the purlin support steel plate.

[0006] Furthermore, the inner wall of the limiting groove is symmetrically provided with fixing grooves, a movable block is provided in the middle of the fixing groove, a connecting rod is provided at the end of the movable block away from the lead screw, a wedge is fixedly connected to the other end of the connecting rod, a wedge is provided below the wedge, a fixing frame is fixedly connected to the bottom end of the wedge, and a rotating wheel is equidistantly provided at the bottom end of the fixing frame, and the outer wall of the fixing frame is slidably connected to the inner wall of the upper section of the limiting frame; In its initial state, the rotating wheel is fully embedded in the inner wall of the upper end of the limiting frame.

[0007] Furthermore, a push plate is provided on the side of the inner wall of the limiting groove near the purlin support steel plate. A fixed spring is elastically connected to one end of the push plate near the limiting groove. A connecting plate is fixedly connected to the bottom end of the push plate. The connecting plate is embedded in the inner wall of the limiting frame. A wedge block is fixedly connected to the bottom end of the connecting plate.

[0008] Furthermore, a stop plate is slidably connected to the inner wall of the lower section of the limiting frame, and a stop block is fixedly connected to the bottom end of the stop plate. The end of the stop block away from the side of the purlin support plate is designed with a slope, and the slope of the stop block is in contact with the upper surface of the wedge block.

[0009] Furthermore, a push block is fixedly connected to the bottom side of the positioning plate, and the push block is slidably connected to the fixing groove.

[0010] Furthermore, the clamping block has symmetrically provided positioning grooves on its side, and an arc-shaped block is provided on the inner wall of the positioning groove. A connecting rod two is fixedly connected to one side of the arc-shaped block, and the other end of the connecting rod two is fixedly connected to the clamping plate.

[0011] Furthermore, a channel is provided in the middle of the positioning groove, and an arc-shaped block is slidably connected to the inner wall of the channel, with the side of the arc-shaped block having an arc-shaped design.

[0012] The technical solution provided by this invention has the following advantages compared with the prior art: This invention features a locking assembly with an "initial avoidance-gradual locking" design. Initially, the assembly is located at the end of the limiting groove furthest from the purlin support plate, maintaining a sufficient gap to avoid installation interference. When the screw is rotated clockwise, the threaded engagement between the screw groove and the screw drives the locking assembly to move smoothly, ensuring that the operator has sufficient time to observe the alignment. When it moves to the end of the limiting groove, the clamping block automatically aligns with the side of the purlin support plate. The clamping plate gradually tightens under the elastic action of the arc-shaped block, and the arc-shaped surface of the arc-shaped block slides along the positioning groove. A gradual clamping force is applied through the connecting rod, which prevents plastic deformation of the steel plate and ensures a tight fit, achieving "flexible wrapping + rigid positioning".

[0013] This invention features a rotating wheel. In the locked state, the rotating wheel is fully embedded in the inner wall of the upper section of the limiting frame, without contacting the channel steel, ensuring reliable static friction locking. When the screw is rotated in the opposite direction to move the locking assembly towards the center of the limiting groove, the push block slides along the fixed groove, pushing the movable block in the middle. This, through the connecting rod, drives the wedge block to move horizontally. Its inclined surface cooperates with the wedge block, converting the horizontal force into a multiple of the vertical force, pushing the fixed frame downward, causing the rotating wheel to contact the channel steel. The friction mode changes from static friction to rolling friction, significantly reducing sliding resistance. A single person can easily push the positioning component to move. The rotating wheel is made of wear-resistant material, resulting in minimal rolling wear and a significantly extended lifespan. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0015] Figure 1 This is a schematic diagram of the welded connection process according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the positioning component structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the card assembly structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the clamping plate structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the limiting group structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the active block structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the pusher plate structure according to an embodiment of the present invention.

[0016] The labels in the diagram represent: 1. Channel steel; 2. Purlin support plate; 3. Positioning component; 31. Limiting assembly; 311. Limiting frame; 312. Limiting groove; 313. Lead screw; 315. Movable block; 3151. Connecting rod one; 3152. Wedge one; 3153. Wedge two; 3155. Fixed frame; 3156. Rotating wheel; 316. Push plate; 3161. Fixed spring; 3162. Connecting plate; 3163. Wedge three; 317. Abutment plate; 3171. Abutment block; 318. Fixed groove; 32. Engaging assembly; 321. Positioning plate; 322. Threaded groove; 323. Push block; 325. Positioning groove; 326. Arc-shaped block; 327. Clamping block; 328. Clamping plate; 329. Connecting rod two; 33. Auxiliary rod. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] The present invention will be further described below with reference to embodiments.

[0019] Example:

[0020] Please see Figure 1 - Figure 8 This invention provides a technical solution for on-site welding connection of channel steel transition purlin support steel plates, including the following steps: S1. During the construction preparation stage, inspect the materials and welding equipment to ensure that the welders are qualified and that safety protection measures are in place. S2. Clean impurities from the joint edges before welding, and mark the positions according to the design; S3. Clamp the structure with positioning equipment and form a temporary fixing part by spot welding to ensure accurate positioning; S4. Set the matching welding parameters as needed for formal welding, and control the weld leg size and weld formation quality; S5. After welding, the welding slag must be cleaned and the weld seam must be ground. S6. Perform non-destructive testing, visual inspection, and dimensional verification according to design requirements; refer to Figure 2 and Figure 3The temporary fixing part in S2 includes a channel steel 1, and a purlin support steel plate 2 is welded to the top of the channel steel 1. The channel steel 1 is initially fixed to the purlin support steel plate 2 by a positioning part 3 that is slidably connected to the top side. The positioning part 3 includes a limiting group 31 that is slidably connected to the top side of the channel steel 1. The top of the limiting group 31 is provided with a locking group 32 that initially fixes the side of the purlin support steel plate 2. The symmetrically arranged locking groups 32 are connected by an auxiliary rod 33. The "symmetric calibration-clamping reinforcement" design of the auxiliary rod 33 improves the positioning symmetry. When the auxiliary rod 33 passes through the positioning grooves 325 on both sides, it applies a radial force to the arc-shaped block 326, causing it to slide along the groove. Through the connecting rod 329, it drives the clamping plate 328 to apply a clamping force to the steel plate. The force difference between the two sides is minimal, ensuring the steel plate's perpendicularity is accurate. At the same time, the rigid connection of the auxiliary rod 33 forces the two-sided locking assembly 32 to maintain symmetry, solving the problem of unilateral positioning tilt and keeping the cumulative error of multiple purlins within a range better than the specification requirements.

[0021] refer to Figure 3 , Figure 4 and Figure 5 The locking assembly 32 includes a clamping block 327 for locking the side of the purlin support steel plate 2. A positioning plate 321 is fixedly connected to the bottom end of the clamping block 327. A screw groove 322 is provided in the middle of the bottom end of the positioning plate 321. A clamping plate 328 for clamping the side of the purlin support steel plate 2 is slidably connected to the inner wall of the clamping block 327. A push block 323 is fixedly connected to the bottom side of the positioning plate 321. The push block 323 is slidably connected to the fixing groove 318.

[0022] The clamping block 327 has symmetrically provided positioning grooves 325 on its side. The inner wall of the positioning groove 325 is provided with an arc-shaped block 326. A connecting rod 329 is fixedly connected to one side of the arc-shaped block 326. The other end of the connecting rod 329 is fixedly connected to the clamping plate 328. A channel is provided in the middle of the positioning groove 325. The arc-shaped block 326 is slidably connected to the inner wall of the channel. The side of the arc-shaped block 326 adopts an arc-shaped design.

[0023] The locking assembly 32 adopts an "initial avoidance-gradual locking" design. Initially, it is located at the end of the limiting groove 312 away from the purlin support steel plate 2, maintaining a sufficient gap with the steel plate to avoid installation interference. When the screw 313 is rotated clockwise, the threaded engagement between the screw groove 322 and the screw 313 drives the locking assembly 32 to move smoothly, ensuring that the operator has enough time to observe the alignment. When it moves to the end of the limiting groove 312, the clamping block 327 automatically aligns with the side of the purlin support steel plate 2, and the clamping plate 328 gradually tightens under the elastic action of the arc-shaped block 326. The arc surface of the arc-shaped block 326 slides along the positioning groove 325, and a gradual clamping force is applied through the connecting rod 329, which not only prevents plastic deformation of the steel plate but also ensures a tight fit, achieving "flexible wrapping + rigid positioning".

[0024] refer to Figure 3 , Figure 6 and Figure 7The limiting group 31 includes a limiting frame 311 that is slidably connected to the top side of the channel steel 1. A limiting groove 312 is opened in the middle of the top of the limiting frame 311. A lead screw 313 is rotatably connected in the middle of the limiting groove 312. The outer wall of the lead screw 313 is threadedly connected to the inner wall of the screw groove 322. The inner wall of the limiting groove 312 is symmetrically provided with a fixing groove 318. A movable block 315 is provided in the middle of the fixing groove 318. A connecting rod 3151 is provided at the end of the movable block 315 away from the lead screw 313. A wedge 3152 is fixedly connected to the other end of the connecting rod 3151. A wedge 3153 is provided below the wedge 3152. A fixing frame 3155 is fixedly connected to the bottom end of the wedge 3153. Rotary wheels 3156 are equidistantly provided at the bottom end of the fixing frame 3155. The outer wall of the fixing frame 3155 is slidably connected to the inner wall of the upper section of the limiting frame 311. In the initial state, the rotary wheels 3156 are completely embedded in the inner wall of the upper end of the limiting frame 311.

[0025] The "friction switching" mechanism of the rotating wheel 3156 achieves wear-free migration. In the locked state, the rotating wheel 3156 is completely embedded in the inner wall of the upper section of the limiting frame 311 and does not contact the channel steel 1, ensuring reliable static friction locking. When the screw 313 is rotated in the opposite direction to move the locking assembly 32 towards the center of the limiting groove 312, the push block 323 slides along the fixed groove 318 and pushes the movable block 315 in the middle. Through the connecting rod 3151, the wedge 3152 is driven to move horizontally. Its slope surface cooperates with the wedge 3153 to convert the horizontal force into a multiple of the vertical force, pushing the fixed frame 3155 downward, so that the rotating wheel 3156 contacts the channel steel 1. The friction mode changes from static friction to rolling friction, which greatly reduces the sliding resistance. A single person can easily push the positioning part 3 to move. The rotating wheel 3156 is made of wear-resistant material, with minimal rolling wear and a significantly extended service life.

[0026] refer to Figure 3 , Figure 6 and Figure 8 A push plate 316 is provided on the inner wall of the limiting groove 312 near the purlin support steel plate 2. A fixing spring 3161 is elastically connected to the end of the push plate 316 near the limiting groove 312. A connecting plate 3162 is fixedly connected to the bottom end of the push plate 316. The connecting plate 3162 is embedded in the inner wall of the limiting frame 311. A wedge block 3163 is fixedly connected to the bottom end of the connecting plate 3162. A stop plate 317 is slidably connected to the inner wall of the lower section of the limiting frame 311. A stop block 3171 is fixedly connected to the bottom end of the stop plate 317. The end of the stop block 3171 away from the side of the purlin support steel plate 2 is designed with a slope. The slope of the stop block 3171 fits against the upper surface of the wedge block 3163.

[0027] The "force amplification-locking" linkage of the wedge drive enhances high-altitude vibration resistance. When the locking assembly 32 clamps the steel plate, the positioning plate 321 applies a horizontal force to the push plate 316, compressing the fixed spring 3161. This compresses the wedge block 3163, which then moves towards the steel plate via the connecting plate 3162. The wedge block 3163 engages with the inclined surface of the abutment block 3171, converting the horizontal force into a multiple of the vertical force. This pushes the abutment plate 317 upwards to contact the flange of the channel steel 1, significantly increasing static friction and resisting strong wind loads, ensuring the stability and non-displacement of the positioning component 3 during welding. Regarding the issue of "low efficiency due to repeated disassembly and assembly," the rolling friction of the roller 3156 significantly shortens the migration time, and the "sliding-locking" state switching eliminates the need for disassembly, significantly improving the positioning efficiency of a single channel steel 1 and meeting the demands of expedited work. Addressing the issue of "accumulated positioning accuracy deviation," the auxiliary rod 33 ensures precise alignment of the two side locking assemblies 32, the push plate 316 adaptively centers and controls the deviation of the single purlin support axis, and the sliding guide constrains accumulated errors, ensuring uniform load transfer. In terms of "safety risks in high-altitude operations," integrated operation reduces physical movements and shortens single operation time. The auxiliary rod 33 provides a stable grip point, and the strong locking force prevents detachment, significantly reducing safety risks and complying with relevant safety regulations. Regarding the issue of "short wear life of positioning component 3," the rolling friction of the roller 3156 significantly reduces wear, the arc-shaped block 326's arc-shaped surface contact avoids stress concentration, and key components undergo high-strength treatment, extending service life and reducing replacement costs.

[0028] The limit group 31 and the locking group 32 are combined, and the lead screw 313 and the screw groove 322 cooperate to provide precise drive. The thread self-locking prevents vibration and loosening. The push block 323 and the movable block 315 are linked to synchronize "locking-unlocking" and "friction switching", reducing operation steps and realizing "drive-locking" integration. The locking group 32 and the auxiliary rod 33 are combined. The auxiliary rod 33 forces symmetry on both sides to solve the tilting problem. The arc block 326 increases the clamping force of the clamping plate 328 by transmitting force, ensuring the stability of the steel plate during welding and realizing the dual function of "clamping-calibration". The wedge system and the rotating wheel 3156 are combined. The force amplification effect of wedge one 3152 and wedge two 3153 requires only a small pushing force to switch the rotating wheel 3156. The force amplification of wedge three 3163 and the abutment block 3171 makes the locking friction much greater than that of the rolling state, balancing reliability and flexibility. The push plate 316 is combined with the fixed spring 3161. The preload of the fixed spring 3161 causes the push plate 316 to apply a symmetrical constraint force, which automatically corrects the initial offset without manual intervention, improves the centering efficiency, and achieves "adaptive centering". During construction, the positioning component 3 is first placed stably on the side of the channel steel 1 and pushed along the length of the channel steel 1 to the vicinity of the purlin support steel plate 2 to be welded. In the initial state, the locking assembly 32 is located at the end of the limiting groove 312 away from the purlin support steel plate 2, maintaining a sufficient gap with the purlin support steel plate 2 to ensure that the two do not come into contact, reserving operating space for subsequent precise alignment. Next, the operator rotates the lead screw 313 clockwise. Utilizing the threaded transmission between the lead screw 313 and the threaded groove 322, the engaging assembly 32 moves along the limiting groove 312 towards the end closest to the purlin support plate 2. When the engaging assembly 32 reaches the end of the limiting groove 312, the clamping block 327 engages precisely with the side of the purlin support plate 2, achieving initial fixation of the purlin support plate 2. During this process, the positioning plate 321 simultaneously applies a horizontal thrust to the push plate 316. Upon receiving this force, the push plate 316 pushes the connecting plate 3162 and the wedge block 3163 towards the purlin support plate 2. Since the upper surface of wedge 3163 is in close contact with the inclined surface of abutment 3171, under the action of the inclined wedge, abutment 3171 drives abutment plate 317 to rise upward, so that abutment plate 317 is in close contact with the flange of channel steel 1, significantly increasing the friction between limit frame 311 and channel steel 1, ensuring that positioning component 3 is stably locked during high-altitude operations. After initial fixing, the auxiliary rod 33 is passed laterally through the positioning grooves 325 of the two side locking assemblies 32. The outer surface of the auxiliary rod 33 contacts the inner wall of the arc-shaped block 326 and applies radial force. The arc-shaped block 326 slides along the channel in the positioning groove 325, and through the connecting rod 329, it drives the clamping plate 328 to tighten towards the side of the purlin support steel plate 2, which greatly increases the friction between the clamping plate 328 and the purlin support steel plate 2. This operation not only ensures the symmetrical alignment of the two side locking assemblies 32, but also provides a continuous and tight constraint force for the purlin support steel plate 2 during welding, effectively resisting welding thermal deformation. After the welding of one purlin support plate 2 is completed, the auxiliary rod 33 is removed first to remove the additional reinforcement to the purlin support plate 2. Then, the screw 313 is rotated counterclockwise, and the locking assembly 32 moves as a whole away from the purlin support plate 2. The push plate 316 is no longer under the pressure of the positioning plate 321, and the elastic deformation of the fixing spring 3161 is restored, which drives the connecting plate 3162 and the wedge block 3163 to reset away from the purlin support plate 2. After the abutment block 3171 loses the pushing force of the wedge block 3163, the abutment plate 317 falls under the action of gravity, no longer increasing the friction between the limit frame 311 and the channel steel 1. When the positioning plate 321 moves to the middle of the limiting groove 312, the clamping block 327 completely disengages from the side of the purlin support plate 2. The push block 323 at the bottom of the positioning plate 321 slides synchronously to the middle position along the fixed groove 318 and contacts the movable block 315 in the fixed groove 318. After being subjected to force, the movable block 315 pushes the connecting rod 3151 and the wedge 3152 to move. The wedge 3152 applies a downward force to the wedge 3153 through the inclined plane transmission, driving the fixed frame 3155 and the rotating wheel 3156 to move down synchronously. The rotating wheel 3156, which was originally completely embedded in the upper inner wall of the limiting frame 311 under the action of the telescopic spring, extends and contacts the top of the channel steel 1, so that the contact part between the positioning part 3 and the channel steel 1 changes from sliding friction to rolling friction, greatly reducing the moving resistance, making it easy for the operator to push the positioning part 3 to the next purlin support plate 2 for cyclic limiting and fixing operations.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for on-site welding connection of steel plates for channel steel transition purlins, characterized in that, include: S1. During the construction preparation stage, inspect the materials and welding equipment to ensure that the welders are qualified and that safety protection measures are in place. S2. Clean impurities from the joint edges before welding, and mark the positions according to the design; S3. Clamp the structure with positioning equipment and form a temporary fixing part by spot welding to ensure accurate positioning; S4. Set the matching welding parameters as needed for formal welding, and control the weld leg size and weld formation quality; S5. After welding, the welding slag must be cleaned and the weld seam must be ground. S6. Perform non-destructive testing, visual inspection, and dimensional verification according to design requirements; The temporary fixing part in S2 includes a channel steel (1), and a purlin support steel plate (2) is welded to the top of the channel steel (1). The channel steel (1) is initially fixed to the purlin support steel plate (2) by a positioning part (3) that is slidably connected to the top side. The positioning part (3) includes a limiting group (31) that is slidably connected to the top side of the channel steel (1). The top of the limiting group (31) is provided with a locking group (32) that is initially fixed to the side of the purlin support steel plate (2). The locking groups (32) that are symmetrically arranged are connected by an auxiliary rod (33). The locking assembly (32) includes a clamping block (327) for locking the side of the purlin support plate (2). The bottom end of the clamping block (327) is fixedly connected to a positioning plate (321), and a screw groove (322) is provided in the middle of the bottom end of the positioning plate (321). The limiting group (31) includes a limiting frame (311) that is slidably connected to the top side of the channel steel (1). A limiting groove (312) is opened in the middle of the top of the limiting frame (311). A screw rod (313) is rotatably connected in the middle of the limiting groove (312). The outer wall of the screw rod (313) is threadedly connected to the inner wall of the screw groove (322). The inner wall of the clamping block (327) is slidably connected to a clamping plate (328) for clamping the side of the purlin support plate (2).

2. The on-site welding connection process for channel steel transition purlin support steel plates according to claim 1, characterized in that: The inner wall of the limiting groove (312) is symmetrically provided with a fixing groove (318). A movable block (315) is provided in the middle of the fixing groove (318). A connecting rod (3151) is provided at one end of the movable block (315) away from the lead screw (313). A wedge (3152) is fixedly connected to the other end of the connecting rod (3151). A wedge (3153) is provided below the wedge (3152). A fixing frame (3155) is fixedly connected to the bottom end of the wedge (3153). A rotating wheel (3156) is equidistantly provided at the bottom end of the fixing frame (3155). The outer wall of the fixing frame (3155) is slidably connected to the inner wall of the upper section of the limiting frame (311). In the initial state, the wheel (3156) is completely embedded in the upper inner wall of the limit frame (311).

3. The on-site welding connection process for channel steel transition purlin support steel plates according to claim 2, characterized in that: A push plate (316) is provided on the side of the inner wall of the limiting groove (312) near the purlin support steel plate (2). A fixing spring (3161) is elastically connected to one end of the push plate (316) near the limiting groove (312). A connecting plate (3162) is fixedly connected to the bottom end of the push plate (316). The connecting plate (3162) is embedded in the inner wall of the limiting frame (311). A wedge block (3163) is fixedly connected to the bottom end of the connecting plate (3162).

4. The on-site welding connection process for channel steel transition purlin support steel plates according to claim 3, characterized in that: The lower section of the limiting frame (311) is slidably connected to a stop plate (317), and the bottom end of the stop plate (317) is fixedly connected to a stop block (3171). The end of the stop block (3171) away from the side of the purlin support plate (2) is designed with a slope, and the slope of the stop block (3171) is in contact with the upper surface of the wedge block three (3163).

5. The on-site welding connection process for channel steel transition purlin support steel plates according to claim 2, characterized in that: A push block (323) is fixedly connected to the bottom side of the positioning plate (321), and the push block (323) is slidably connected to the fixing groove (318).

6. The on-site welding connection process for channel steel transition purlin support steel plates according to claim 1, characterized in that: The clamping block (327) has symmetrically provided positioning grooves (325) on its side. The inner wall of the positioning groove (325) is provided with an arc-shaped block (326). A connecting rod (329) is fixedly connected to one side of the arc-shaped block (326), and the other end of the connecting rod (329) is fixedly connected to the clamping plate (328).

7. The on-site welding connection process for channel steel transition purlin support steel plates according to claim 6, characterized in that: The positioning groove (325) has a channel in the middle, and an arc-shaped block (326) is slidably connected to the inner wall of the channel. The side of the arc-shaped block (326) is designed in an arc shape.

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