Inlaying section inner welding trolley and inner welding device for reinforcing U-rib and U-rib reinforcing method

Abstract

The invention provides an inlaying section inner welding trolley for reinforcing a U-shaped rib, an inner welding device and a U-shaped rib reinforcing method, and relates to the field of bridge engineering construction. The inner welding trolley comprises a trolley body used for walking in a U-shaped rib in the length direction of the U-shaped rib; the walking guide unit is mounted on the vehicle body and is used for guiding the vehicle body; the inlaying section welding unit is installed on the vehicle body and located in front of the walking guide unit and comprises a first support, the first support comprises a base and a back plate located above the base, a first through hole is formed in the middle of the back plate, and two second through holes are formed in the two sides of the first through hole respectively; the telescopic assembly comprises a stepping motor installed on the rear surface of the back plate, a lead screw penetrating through the stepping motor and the first through hole, a supporting rod penetrating through the second through hole and a second support connected to the front end of the lead screw and the front end of the supporting rod. And the welding gun assembly is mounted on the second bracket. Mutual overlapping of hole edge stress concentration areas caused by a large number of holes is prevented, and the overall stability and safety of the bridge are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering construction, specifically to a U-rib reinforcement interlocking section welding machine, an internal welding device, and a U-rib reinforcement method. Background Technology

[0002] During the reinforcement of in-service steel bridges' U-ribs, holes need to be drilled in the U-ribs. To ensure that the structural performance of the steel bridge is not compromised, the holes are usually drilled in the patch section of the U-rib (i.e., the weld area where the U-ribs meet). This way, the use of the steel bridge is not affected, and construction can begin without interrupting operation. After drilling, an internal welding machine is used to enter the U-rib through the drilled hole and repair the weld between the U-rib and the top plate from the inside, thereby reinforcing the U-rib.

[0003] However, the current welding method has two main problems: the first is the stability of equipment operation; the second is the impact of specific hole-opening operations on the in-service U-ribs.

[0004] Regarding the first type of problem mentioned above, the patch segment is the on-site assembly part of the U-shaped longitudinal rib (U-rib) used to connect two adjacent precast segments during the construction of long-span steel bridge segments. Its core functions include: matching the dimensional errors of adjacent beam segments, compensating for welding deformation, and ensuring continuous stress transition. During the movement of the welding truck through the U-rib, when it reaches the patch segment (without perforations), the patch segment may have certain dimensional or shape errors compared to the non-patterned segment. Due to these errors, the welding truck may experience vehicle bumps due to height differences when passing through the patch segment (without perforations). This can cause the welding torch to vibrate during welding, leading to weld errors and ultimately, failure of the patch segment repair weld. This has a significant impact on the overall mechanical properties of the U-rib.

[0005] Regarding the second type of problem mentioned above, due to equipment limitations, current technology mainly enables localized repair of single U-ribs or a very small number (e.g., 2-3 U-ribs), while there is still a gap in modular application. When facing large-scale reinforcement of steel box girders using openings, directly applying small-scale reinforcement opening technology will lead to: 1. Increased risk of structural damage: If a large number of operating holes are opened in close proximity, continuous weak sections will be formed, resulting in a significant reduction in the stiffness of that area. 2. Malicious superposition of stress concentration: Dense openings cause stress concentration zones at the hole edges to overlap, easily inducing multi-source fatigue cracks. 3. Lack of standardized construction guidelines: Existing technology does not provide rules for the arrangement of multiple holes, resulting in high arbitrariness in construction and an inability to avoid systemic risks. 4. Potential catastrophic consequences: Large-scale openings in the same cross-section may cause local buckling or overall instability of the steel box girder (especially for long-span bridges), which is a hidden risk that was not exposed in previous small-scale construction. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an internal welding machine for U-rib reinforcement, an internal welding device, and a U-rib reinforcement method. It can stably weld the interlocking segments with U-rib openings and can perform large-scale internal welding reinforcement of entire span steel box girders without damaging the structural integrity of the steel bridge and avoid stress superposition in the bridge.

[0007] A first aspect of the present invention provides an inner welding machine for U-rib reinforcement inserts, the inner welding machine comprising: The vehicle body travels within the U-rib along the length of the U-rib; A walking guidance unit, installed on the vehicle body, is used to drive the vehicle body forward and guide the vehicle body. A patching section welding unit is installed on the vehicle body and located in front of the travel guide unit, wherein the patching section welding unit includes: The first support includes a base and a back plate located above the base. A first through hole is provided in the middle of the back plate, and two second through holes are provided on both sides of the first through hole. The telescopic assembly includes a stepper motor mounted on the rear surface of the back plate, a lead screw passing through the stepper motor and the first through hole, a support rod passing through the second through hole, and a second bracket connected to the front end of the lead screw and the support rod; and A welding torch assembly, which is mounted on the second bracket.

[0008] Furthermore, the welding torch assembly includes A first linear output device, with a welding torch unit mounted above it, the first linear output device being used to provide the welding torch with a horizontal displacement perpendicular to the length direction of the U-rib. A second linear output device is connected below the first linear output device and is used to provide vertical displacement to the first linear output device.

[0009] Optionally, the welding torch unit includes a welding torch holder, on which two welding torches are provided, the two welding torches pointing to the U-rib welds at both ends respectively.

[0010] Optionally, the welding torch unit includes a welding torch holder and a steering motor disposed at the rear end of the welding torch holder, wherein a welding torch is disposed on the welding torch holder.

[0011] Furthermore, a guide is provided above the welding torch holder. The guide includes a connecting rod installed on the welding torch holder, side guide wheels located at both ends of the connecting rod, and an upper guide wheel located above the connecting rod. The maximum distance between the two side guide wheels is greater than the width of the welding torch holder and less than the width of the U-rib.

[0012] Furthermore, a support rod bearing is provided at the second through hole, and the support rod passes through the support rod bearing.

[0013] Furthermore, the inner welding vehicle also includes a counterweight located at the rear end of the vehicle body.

[0014] According to a second aspect of the present invention, an internal welding apparatus is provided, the internal welding apparatus comprising an internal welding carriage for U-rib reinforcement insert section according to a first aspect of the present invention and a wire feeding carriage, the wire feeding carriage comprising a welding wire spool and a wire feeding drive mechanism.

[0015] According to a third aspect of the present invention, a U-rib reinforcement method is provided, the method comprising welding using the internal welding apparatus according to a second aspect of the present invention, the method comprising: Step S1: Make an opening in the interlocking section of the U-rib; Step S2: Perform U-rib repair welding using the internal welding apparatus according to the second aspect of the present invention.

[0016] Further, step S1 includes: Step S1-1: Determine the parallel U-rib groups that need to be reinforced on the top or bottom plate of the steel box girder; Step S1-2: According to the construction progress, the U-ribs in the U-rib group are numbered according to the two U-ribs that are adjacent in the longitudinal position, and the numbers are odd-numbered rib groups and even-numbered rib groups. Step S1-3: Draw lines according to the staggered opening method to determine the opening position, wherein the opening position corresponds to the intercalation segment of the U-rib; Steps S1-4: Plan the construction date and make construction holes at the marked positions for both odd-numbered and even-numbered rib groups. The layout and line drawing method using staggered openings in steps S1-3 must meet at least one of the following conditions: 1. The opening centers of adjacent U-ribs are not on the same cross-section; 2. There is at most one opening on any cross-section of the U-rib.

[0017] Furthermore, the opening positions on two adjacent U-ribs of each rib group are staggered by a set distance in the longitudinal direction, and The distance of the longitudinal misalignment is an integer multiple of the length of the U-rib.

[0018] Further, step S2 includes: The internal welding device is inserted into the U-rib from the opening in step S1, and the non-repaired section of the U-rib is repaired using the internal welding device; and Continue to use the internal welding device to weld the U-rib patch section.

[0019] This invention provides an internal welding carriage for U-rib reinforcement with a telescopic component. In use, the internal welding carriage can perform internal welding on the entire U-rib without passing through the un-drilled patch section. Therefore, the height difference caused by adding backing plates or other structures does not affect the quality and stability of the internal weld. By incorporating the telescopic component, the welding torch can move freely along the length of the U-rib without requiring the internal welding carriage to move. Furthermore, the specific position of the welding torch is adjusted using a first linear output device and a second linear output device, resulting in more stable welding of the patch section.

[0020] To address the need for internal welded reinforcement openings for multiple parallel U-ribs within a steel box girder, this invention employs a longitudinally staggered layout of opening positions on adjacent U-ribs. This avoids the stress superposition effect caused by concentrated openings at the same cross-sectional height, significantly reducing the damage to the structural integrity of the steel bridge caused by the openings and improving the fatigue life and load-bearing safety of the reinforced bridge. This invention sets the opening positions in the intercalation section of the U-ribs and adopts a longitudinally staggered opening method, proposing the "single-hole principle," meaning only a single hole exists on the same cross-section. Simultaneously, the "odd-even staggered" principle is proposed to minimize stress concentration. This avoids opening a large number of operating holes in close proximity, preventing a significant reduction in stiffness; it also prevents overlapping stress concentration zones at the hole edges due to dense openings, thereby ensuring the overall stability of the bridge and its stability and safety in later use. Furthermore, this application specifically proposes a targeted construction scheme that effectively avoids systemic risks and improves construction efficiency. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the welding machine inside the U-rib reinforcement patch section according to the present invention; Figure 2 A three-dimensional schematic diagram of the patching section welding unit of the U-rib reinforcement patching section welding machine according to the present invention; Figure 3 A three-dimensional schematic diagram of the welding gun unit of the welding vehicle for the U-rib reinforcement patching section according to the present invention; Figure 4 This is a three-dimensional schematic diagram of the internal welding device according to the present invention; Figure 5 This is a schematic diagram of the cross-section of a steel box girder in the U-rib reinforcement method according to the present invention; Figure 6 This is a schematic diagram of the U-rib group structure in a steel box girder according to the first embodiment of the U-rib reinforcement method of the present invention. Figure 7 This is a schematic diagram of the U-rib group structure in a steel box girder according to the second embodiment of the U-rib reinforcement method of the present invention.

[0022] Reference numerals: 1-Inner welding device; 10-Inner welding vehicle for U-rib reinforcement patch section; 100-Vehicle body; 101-Vehicle floor plate; 200-Walking guide unit; 300-Patch section welding unit; 301-Base; 302-Back plate; 303-First through hole; 304-Stepper motor; 305-Screw rod; 306-Support rod; 307-Second bracket; 308-First linear output device; 309-Welding... Gun unit; 3091-Welding gun holder; 3092-Welding gun; 3093-Steering motor; 3094-Guide component; 30941-Connecting rod; 30942-Side guide wheel; 30943-Upper guide wheel; 310-Second linear output device; 311-Support rod bearing; 400-Counterweight; 11-Wire feeding carriage; 111-Welding wire spool; 112-Wire feeding drive mechanism; R-U-rib in steel box girder. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The principles and features of the present invention are described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The embodiments given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0024] It should be noted that the directions "front", "rear", "left", "right", "up", and "down" mentioned in this invention are all described based on the accompanying drawings. In the drawings, "front" refers to the direction of the welding torch, and "rear" refers to the opposite direction. "Down" refers to the direction of the wheel, and "up" refers to the opposite direction. "Left" refers to the direction on the left in the front view, and "right" refers to the opposite direction. The above directions are marked in the drawings. In actual application, the specific directions are not limited, and the focus is on the ability to implement this invention.

[0025] The first aspect of this invention provides a U-rib reinforcement patching section internal welding machine 10. It should be noted that the U-rib reinforcement patching section internal welding machine 10 of this invention is not limited to patching welding of U-ribs; it can also be used for welding the entire internal weld seam of the U-rib during reinforcement, and can be adjusted as needed. Specifically, as... Figure 1 As shown, the U-rib reinforcement patching section welding vehicle 10 of the present invention includes: a vehicle body 100, a travel guide unit 200, and a patching section welding unit 300.

[0026] The vehicle body 100 typically includes a floor 101 and a roof (the roof is omitted in the accompanying drawings for ease of showing the interior structure). The floor 101 and the roof together form the vehicle body 100, which has an internal storage space. The vehicle body 100 travels within the U-rib along the length of the U-rib. A travel guide unit 200 is mounted on the vehicle body 100 to drive and guide the vehicle body 100. The travel guide unit 200 typically includes a travel unit and a guide unit. There are generally two forms of the travel guide unit 200. In one form, the travel unit can be configured as a wheel, and the guide unit can be configured as a guide wheel supported above the wheel by a support member. The circumferential surface of the wheel presses against the side wall of the U-rib, thereby enabling the vehicle body 100 to maintain its movement along the length of the U-rib. In another form, the travel unit can be configured as a wheel, and the guide unit can be configured as a track located on the U-rib for use with the wheel. Figure 1 The diagram shows the first embodiment of the invention. Of course, in some embodiments of the invention, both of the above embodiments may coexist, i.e., wheels and guide wheels are provided within the vehicle body 100, and tracks matching the wheels are laid on the U-rib. The travel guidance unit 200 also includes a drive device capable of driving the wheels to travel along the length of the U-rib.

[0027] As mentioned earlier, during the U-rib reinforcement process, after the patching section opens, the inner welding carriage is sent in through the opening. When welding the patching section after the non-patching section is completed, due to the structural differences between the patching and non-patching sections caused by mechanical requirements, the ordinary inner welding carriage may experience vehicle bumps during travel due to height and width differences, leading to movement of the welding torch position and ultimately changing the welding position, resulting in poor welding. Therefore, this invention provides a patching section welding unit 300 in the inner welding carriage, enabling the inner welding carriage of this invention to maintain stable welding when it reaches the patching section welding position.

[0028] Specifically, the patch welding unit 300 of the present invention is mounted on the vehicle body 100 and located in front of the travel guide unit, that is, in front of the wheel. The patch welding unit 300 includes: a first bracket, a telescopic assembly, and a welding torch assembly.

[0029] The first bracket is positioned in front of the wheel, without contacting it, to avoid affecting the wheel's movement. For example... Figure 2As shown, the first support includes a base 301 and a back plate 302 located above the base 301. The base 301 can be, for example, an inverted U-shaped frame. The back plate 302 is connected to the upper surface of the base 301, and the back plate 302 and the base 301 can be integrally formed. A first through hole 303 is provided in the middle of the back plate 302, and two second through holes are provided on both sides of the first through hole 303. The through holes are used to accommodate the lead screw 305 and the support rod 306, which will be described in detail later. The center of the first through hole 303 is on the centerline of the back plate 302, usually slightly above, but not tangent to the upper edge of the back plate 302. That is, there is a certain distance between the top of the first through hole 303 and the upper edge of the back plate 302. Similarly, there is also a certain distance between the bottom of the first through hole 303 and the lower edge of the back plate 302. The distance between the top of the first through hole 303 and the upper edge of the back plate 302 is less than or equal to the distance between the bottom of the first through hole 303 and the lower edge of the back plate 302. The second through hole is located on both sides of the first through hole 303. Usually, in order to make the structure more stable, the center height of the two second through holes is the same and they are not on the same horizontal line as the center of the first through hole 303. In this way, the centers of the three through holes can be connected in sequence to form a stable triangular structure.

[0030] The telescopic assembly includes a stepper motor 304 mounted on the rear surface of the back plate 302, a lead screw 305 passing through the stepper motor 304 and a first through hole 303, a support rod 306 passing through a second through hole, and a second bracket 307 connecting the front ends of the lead screw 305 and the support rod 306. The lead screw 305 passes through the stepper motor 304, which provides power for the lead screw 305 to move forward and backward. After passing through the second through hole, the front end of the support rod 306 remains in the same position as the front end of the lead screw 305, i.e., connected to the second bracket 307. The support rod 306 passing through the second through hole provides support for the welding torch assembly. The telescopic assembly of the present invention has the following structure: when the stepper motor 304 provides a forward and backward driving force to the lead screw 305, causing the lead screw 305 to move forward and backward, the second bracket 307 moves forward and backward under the drive of the lead screw 305. Since the front end of the support rod 306 is also connected to the second bracket 307, the second bracket 307 drives the two support rods 306 to move forward and backward accordingly. Based on the above structure, after the stepper motor 304 of the telescopic device of the present invention is started, the lead screw 305, the support rods 306, and the second bracket 307 can move forward and backward simultaneously and in unison. The welding torch assembly of the present invention is mounted on the second bracket 307.

[0031] It should be noted that the inner diameter of the first through hole 303 is larger than the outer diameter of the lead screw 305. The inner diameter of the second through hole is usually close to the outer diameter of the support rod 306. This closeness is such that the support rod 306 can just pass through the second through hole and move smoothly back and forth within it, while the second through hole can provide support for the support rod 306, preventing it from getting stuck during movement. Since the lead screw 305 is equipped with a stepper motor 304, the inner diameter of the first through hole 303 only needs to be larger than the outer diameter of the lead screw 305 but smaller than the size of the stepper motor 304.

[0032] Based on the patching section welding unit 300 of the present invention, when the inner welding carriage finishes welding the non-patching section and moves to the patching section, the inner welding carriage stops moving, the stepper motor 304 is started, and the lead screw 305 is controlled to extend and retract, thereby driving the front support to extend and retract, so that the welding torch 3092 can move in the length direction of the U-rib to weld the patching section of the U-rib. The U-rib reinforcement patching section inner welding carriage 10 provided by the present invention does not need to move the vehicle when performing inner welding of the patching section. It only needs to extend and retract the welding torch 3092 along the patching section of the U-rib to weld. In this way, the welding torch 3092 will not shake due to the movement of the welding carriage at a position with a height difference, which will affect the welding, and can provide a stable patching section welding method.

[0033] Furthermore, when welding the patch section, it is usually necessary to adjust the spatial position of the welding torch 3092 inside the U-rib. In order to facilitate detailed adjustment of the spatial position and realize displacement in the horizontal and vertical directions, in some embodiments, the welding torch assembly of the present invention further includes: a first linear output device 308 and a second linear output device 310.

[0034] A welding torch unit 309 is mounted above the first linear output device 308. The first linear output device 308 provides the welding torch 3092 with a horizontal displacement perpendicular to the length of the U-rib, i.e., a left-right displacement. The first linear output device 308 can be, for example, a motor or a cylinder, and is mounted on the second bracket 307. Since the welding torch 3092 is mounted above it, the welding torch 3092 can move accordingly with the displacement of the first linear output device 308, thereby causing displacement in the left-right direction.

[0035] The second linear output device 310 is connected below the first linear output device 308 and is used to provide vertical displacement for the first linear output device 308. The second linear output device 310 can be, for example, a motor or a cylinder, which can push the first linear output device 308 to move vertically, thereby causing the welding torch 3092 to move vertically to adjust the height of the welding torch 3092.

[0036] During the welding process of the patch section, the welding torch unit 309 is adjusted by the first linear output device 308 and the second linear output device 310 so that the welding torch 3092 is aligned with the weld position. By adjusting the above-mentioned telescopic components, the precise welding of the patch section is achieved.

[0037] Furthermore, as described above, the welding torch unit 309 is disposed on the first linear output device 308. The welding torch unit 309 of the present invention may contain one or two welding torches. The specific structures of these two embodiments are described below.

[0038] In one embodiment of the welding torch unit 309 of the present invention, the welding torch unit 309 is provided with two welding torches. The welding torch unit 309 includes a welding torch holder 3091, on which two welding torches are provided. The two welding torches are respectively pointing to the weld seams of the U-rib at both ends. When the inner welding carriage is welding one side of the patch section, the first linear output device 308 and the second linear output device 310 are adjusted so that the welding torch corresponds to the weld seam on one side of the U-rib, and the welding torch is used to weld the weld seam on that side. When it is necessary to weld the other side of the patch section, the first linear output device 308 and the second linear output device 310 are adjusted so that the welding torch corresponds to the weld seam on the other side of the U-rib, and the welding torch is used to weld the weld seam on that side.

[0039] In another embodiment of the welding torch unit 309 of the present invention, the welding torch unit 309 is provided with a welding torch 3092. The welding torch unit 309 includes a welding torch holder 3091 and a steering motor 3093 disposed at the rear end of the welding torch holder 3091. The welding torch holder 3091 is provided with a welding torch 3092. In this case, when the inner welding carriage welds one side of the patch section, the first linear output device 308 and the second linear output device 310 are adjusted, and the steering motor 3093 is adjusted simultaneously, so that the welding torch 3092 corresponds to the weld seam on one side of the U-rib, and the welding torch 3092 is used to weld the weld seam on that side. When it is necessary to weld the other side of the patch section, the first linear output device 308 and the second linear output device 310 are adjusted, and the steering motor 3093 is adjusted simultaneously, so that the welding torch 3092 corresponds to the weld seam on the other side of the U-rib, and the welding torch 3092 is used to weld the weld seam on that side.

[0040] Therefore, through the above structure, the welding torch can be precisely controlled in four dimensions: the length, width, height, and cross-section of the U-rib, thereby achieving precise welding of the patch section.

[0041] Furthermore, such as Figure 3As shown, to make the welding torch more stable during left-right adjustment and movement, in some embodiments of the present invention, a guide member 3094 is provided above the welding torch holder 3091. The guide member 3094 includes a connecting rod 30941 mounted on the welding torch holder 3091, side guide wheels 30942 located at both ends of the connecting rod 30941, and an upper guide wheel 30943 located above the connecting rod. The maximum distance between the two side guide wheels 30942 is greater than the width of the welding torch holder 3091 and less than the width of the U-rib. When welding one side of the patch section, the circumferential surface of the guide wheel on that side presses against the side wall of the U-rib. When welding the other side of the patch section, due to the left-right movement of the first linear output device 308, the circumferential surface of the side guide wheel 30942 on the other side can be pressed against the side wall of the other side of the U-rib. Therefore, during the welding process on both sides, when the telescopic assembly is activated to weld along the length of the U-rib, the welding torch will not vibrate under the action of the guide 3094.

[0042] The maximum distance between the two side guide wheels 30942 is greater than the width of the welding torch holder 3091, preventing the welding torch holder 3091 from colliding with the side wall of the U-rib, thus avoiding damage to the holder and the welding torch. This distance is less than the width of the U-rib, providing sufficient movement distance for the welding torch; otherwise, the nozzle of the welding torch may not be able to contact the weld seam of the U-rib, making welding impossible. The upper guide wheel 30943 above the connecting rod 30941 acts as a limit when the welding torch holder 3091 moves upward, preventing the welding torch holder 3091 from moving excessively upward and colliding with the top plate above the U-rib. When the upper surface of the upper guide wheel 30943 is just abutting the top plate and the circumferential surface of the side guide wheels 30942 is just abutting the side wall of the U-rib, the tip of the welding torch is facing the weld seam on that side.

[0043] Based on the above, the U-rib reinforcement patching section inner welding vehicle of the present invention can further achieve stable welding of the patching section while completing the U-rib weld repair welding, thus solving the technical problem that the patching section cannot be repaired and welded when the inner welding vehicle passes through the patching section due to severe bumps.

[0044] Furthermore, as described above, the support rod 306 effectively provides support for the entire welding torch assembly, as further described in some preferred embodiments of the invention. Figure 2 A support rod bearing 311 is provided at the second through hole, and the support rod 306 passes through the support rod bearing 311. Thus, the bearing provides support for the support rod 306 and can reduce the friction generated by the back-and-forth movement of the support rod 306, thereby improving the service life of the equipment.

[0045] Furthermore, during the welding of the patch section, when the welding torch extends to its furthest point from the inner welding carriage body 100, the welding torch assembly, due to its large weight and torque, may cause the welding carriage to tip forward. To avoid such an accident, in some embodiments of the present invention, the inner welding carriage also includes a counterweight located at the rear end of the carriage body 100. This counterweight 400 can exist in two forms, such as... Figure 1 As shown, the counterweight 400 uses a weight with a height less than the height of the support rod 306 and the tail end of the lead rod 305. This prevents the lead rod 305 and support rod 306 from moving along the length of the U-rib, and also prevents the inner welding carriage from tipping forward after the welding torch extends. Alternatively, a telescopic push rod (not shown) can be used. When the inner welding carriage reaches the patching section and begins welding, the push rod can extend until it extends beyond the carriage body 100 and presses against the inner surface of the top plate above the U-rib (at this time, the top of the inner welding carriage has a through hole corresponding to the push rod, allowing the push rod to extend outside the carriage). When using a telescopic push rod, the design position of the push rod needs to avoid the extension lines of the lead rod 305 and support rod 306 extending backward, thereby preventing the lead rod 305 and support rod 306 from colliding with the push rod during backward movement.

[0046] Therefore, the U-rib reinforcement patching section inner welding machine 10 provided by the present invention can meet the welding operations of various parts in the U-rib reinforcement process. When welding the U-rib patching section, there is no need to change the inner welding equipment, and the patching section can be welded stably and safely.

[0047] According to a second aspect of the present invention, an internal welding apparatus 1 is provided, the internal welding apparatus 1 comprising an internal welding carriage as described in the first aspect of the present invention and a wire feeding carriage 11, the wire feeding carriage 11 including a welding wire spool 111 and a wire feeding drive mechanism 112. For example... Figure 4 As shown, Figure 4 A perspective view of the internal welding device 1 of the present invention is shown. Figure 4 The front of the image is an inner welding carriage according to the first aspect of the present invention, and the rear is a wire feeding carriage 11. The wire feeding carriage 11 includes a welding wire spool 111 and a wire feeding drive mechanism 112. The wire feeding carriage 11 can adopt the first carriage body 100 of the U-rib inner welding carriage independently developed by Wuhan Lixin Automation Technology Co., Ltd. (the specific structure can be found in the description of the structure of the first carriage body 100 in Chinese invention patent CN119216902A, entitled "A U-rib Inner Welding Carriage"). Thus, the inner welding device 1 provided by the present invention, by arranging both the welding wire spool 111 and the wire feeding drive mechanism 112 in the wire feeding carriage 11, can provide sufficient space for the inner welding carriage of the present invention to accommodate the above-mentioned equipment of the present invention, thereby enabling the precise welding of the U-rib patch section.

[0048] Furthermore, according to a third aspect of the present invention, a U-rib reinforcement method is provided, which involves constructing U-ribs for a full-span steel box girder. Multiple parallel U-ribs are welded onto the steel box girder. The method utilizes an inlay welding device 1 for U-rib reinforcement according to a second aspect of the present invention. Specifically, the method of the present invention includes: Step S1: Make an opening in the interlocking section of the U-rib; Step S2: Perform U-rib repair welding using the internal welding device 1 according to the second aspect of the present invention.

[0049] Because this invention specifically designs an internal welding device for the patching section, it can greatly improve the welding efficiency of the patching section. However, the opening method in the existing U-rib reinforcement process cannot meet the welding efficiency requirements of this invention. Therefore, this invention provides a new opening method in the U-rib reinforcement process, which, combined with the internal welding device of this invention, can better improve the reinforcement efficiency of in-service U-ribs. Specifically, the method includes the following steps: Step S1-1: Identify the parallel U-rib groups that need reinforcement on the top or bottom plate of the steel box girder. For example, the U-rib groups requiring reinforcement across the entire span of the steel box girder can be detected using methods such as endoscopy or ultrasound. Figure 5 As shown in the figure, such a group of U-ribs typically consists of dozens or even hundreds of U-ribs welded in parallel to the top plate of the steel box girder. In the figure, R represents a U-rib.

[0050] Step S1-2: According to the construction progress, number the U-ribs in the U-rib group according to the two U-ribs that are adjacent in the longitudinal position, and number them as odd-numbered rib groups and even-numbered rib groups, such as... Figure 6 As shown, Figure 6 A schematic diagram of the longitudinal U-rib arrangement is shown. The diagram shows the arrangement from left to right, but in actual construction, it can be arranged from right to left as needed. The two U-ribs on the left are the first rib group (where 1 is an odd number), followed by two U-ribs as the second rib group (where 2 is an even number), then two more U-ribs as the third rib group (where 3 is an odd number), and so on, until the end. If only one U-rib remains, it is still defined as an odd-numbered rib group.

[0051] Steps S1-3: Draw lines according to the staggered opening method to determine the opening positions, where the opening positions correspond to the intercalation segments of the U-ribs. Specifically, the staggered openings must meet at least one of the following conditions: 1. The centers of the openings of adjacent U-ribs are not on the same cross-section; 2. There is at most one opening on any cross-section of the U-rib. Figure 6 As shown, the openings of two adjacent U-ribs are staggered, thus satisfying the single-hole principle of the cross-section. It should also be noted that the patch section is located in the weld area of ​​the U-rib butt joint (not shown in the figure), that is, the weld area of ​​the U-ribs connecting the front and rear ends.

[0052] Based on the single-hole principle of the above cross-section, the opening positions on two adjacent U-ribs of each rib group, whether odd-numbered, even-numbered, or between odd and even-numbered rib groups, are staggered by a set distance in the longitudinal direction. For example... Figure 6 and Figure 7 As shown, the openings on two adjacent U-ribs in each rib group are staggered. Furthermore, in some embodiments, the aforementioned longitudinal misalignment distance can be an integer multiple of the U-rib length. This is because, as mentioned earlier, the openings are all located in the intercalation segments of the U-ribs, which results in the longitudinal misalignment distance being at least equal to the length of one U-rib. If necessary, openings can be made at intervals of two or more U-rib lengths.

[0053] It should also be noted that the above-described method of drawing lines can employ any technique commonly used in this field.

[0054] Finally, in steps S1-4, the construction dates are planned, and drilling is performed on the odd-numbered and even-numbered rib groups at the marked locations. Specifically, this step includes: counting the first day from the construction date, if the day is odd, construction is performed on the odd-numbered rib groups; if the day is even, construction is performed on the even-numbered rib groups. See again. Figure 6 and Figure 7 According to the parameters of the current internal welding equipment, at least one set of U-ribs can usually be welded in a day, that is, at least one set of U-ribs must be constructed every day. This invention uses the construction of one set of U-ribs per day and the construction of two sets of U-ribs per day as examples for illustration.

[0055] like Figure 6 As shown, in the first embodiment of the method according to the present invention, if a set of U-ribs needs to be completed each day, the first day is an odd-numbered day, so the odd-numbered rib sets are constructed on that day, as indicated by position D1 in the figure; the second day is an even-numbered day, so the even-numbered rib sets are constructed, as indicated by position D2 in the figure. In the second embodiment of the method according to the present invention, as... Figure 7 As shown (taking the third day of construction as an example), if two sets of U-ribs need to be completed each day (for ease of distinction, this implementation method continues the calculation based on the number of days in the first implementation method above), the third day is an odd-numbered day, so the odd-numbered rib sets are constructed on that day, as shown at position D3 in the figure. The fourth day is an even-numbered day, so the even-numbered rib sets are constructed, as shown at position D4 in the figure. The specific hole-opening operation can follow the hole-opening operation in the existing technology.

[0056] The U-rib reinforcement method provided by this invention employs a staggered perforation method. In the absence of mature technological references, this invention is the first to propose a perforation arrangement rule for large-scale U-rib groups, filling a technological gap. The "staggered perforation" method avoids the stress concentration problem caused by multiple holes in the same cross-section. Furthermore, it solves the systemic structural damage risk caused by technological gaps and enables the establishment of large-scale construction standards.

[0057] Furthermore, after drilling holes in the patching section of the in-service U-rib using the aforementioned staggered drilling method, the inner welding device is inserted into the cavity formed by the U-rib and the top plate to reinforce the weld of the U-rib. Specifically, step S2 includes: step S2-1, inserting the inner welding device 1 into the U-rib from the opening in step S1 using a lifting platform and then using the inner welding device to reinforce the non-patching section of the U-rib. The lifting platform can be raised from the ground to the height of the U-rib. The first linear output device 308 and the second linear output device 310 are adjusted so that the welding torch tip is aligned with the weld of the U-rib, allowing the U-rib reinforcement patching section inner welding device 1 to travel along the length of the U-rib and perform patching welding on the U-rib during the travel.

[0058] Further, after repairing the U-rib weld, the patch section of the U-rib needs to be welded: Step S2-2, continue to use the inner welding device 1 to weld the patch section of the U-rib. When the inner welding device 1 moves to the welding position of the patch section, the inner welding device 1 stops moving and is fixed at one end of the patch section. Adjust the telescopic component so that the welding torch is aligned with one end of the patch section to be welded. Continue to adjust the first linear output device 308 and the second linear output device 310 so that the torch tip is aligned with the welding position of the patch section. By continuing to adjust the length of the telescopic component, the welding torch moves along the length direction of the U-rib to weld the patch section.

[0059] Based on this, the present invention, through a specific internal welding device, a specific opening method, and a specific welding method, achieves reinforcement of in-service U-ribs, ensuring the mechanical requirements of the entire U-rib and enabling precise positioning of the welding position, thus achieving efficient and high-quality U-rib reinforcement engineering. Furthermore, the present invention avoids weld instability caused by welding the welding vehicle while passing through the patching section, improving the accuracy of the patching section welding.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A U-rib reinforcement insert welding machine, characterized in that, The internal welding vehicle includes: The vehicle body travels within the U-rib along the length of the U-rib; A walking guidance unit, installed on the vehicle body, is used to drive the vehicle body forward and guide the vehicle body. A patching section welding unit is installed on the vehicle body and located in front of the travel guide unit, wherein the patching section welding unit includes: The first support includes a base and a back plate located above the base. A first through hole is provided in the middle of the back plate, and two second through holes are provided on both sides of the first through hole. The telescopic assembly includes a stepper motor mounted on the rear surface of the back plate, a lead screw passing through the stepper motor and the first through hole, a support rod passing through the second through hole, and a second bracket connected to the front end of the lead screw and the support rod; and A welding torch assembly, which is mounted on the second bracket.

2. The U-rib reinforcement patching section welding machine according to claim 1, characterized in that, The welding torch assembly includes: A first linear output device, with a welding torch unit mounted above it, the first linear output device being used to provide the welding torch with a horizontal displacement perpendicular to the length direction of the U-rib. A second linear output device is connected below the first linear output device and is used to provide vertical displacement to the first linear output device.

3. The U-rib reinforcement patching section welding machine according to claim 2, characterized in that, The welding torch unit includes a welding torch holder, on which two welding torches are provided, the two welding torches pointing to the U-rib welds at both ends respectively.

4. The U-rib reinforcement patching section welding machine according to claim 2, characterized in that, The welding torch unit includes a welding torch holder and a steering motor located at the rear end of the welding torch holder, and a welding torch is provided on the welding torch holder.

5. The U-rib reinforcement patching section welding machine according to claim 3 or 4, characterized in that, The welding torch holder is provided with a guide member above it. The guide member includes a connecting rod installed on the welding torch holder, side guide wheels located at both ends of the connecting rod, and an upper guide wheel located above the connecting rod. The maximum distance between the two side guide wheels is greater than the width of the welding torch holder and less than the width of the U-rib.

6. The U-rib reinforcement patching section welding machine according to claim 1, characterized in that, A support rod bearing is provided at the second through hole, and the support rod passes through the support rod bearing.

7. The U-rib reinforcement patching welding machine according to claim 1, characterized in that, The internal welding vehicle also includes a counterweight located at the rear end of the vehicle body.

8. An internal welding device, characterized in that, The internal welding device includes an internal welding carriage for U-rib reinforcement and a wire feeding carriage according to any one of claims 1 to 7, wherein the wire feeding carriage includes a wire spool and a wire feeding drive mechanism.

9. A U-rib reinforcement method, wherein the method uses the U-rib reinforcement interlocking section welding device according to claim 8 for welding, characterized in that, The method includes: Step S1: Make an opening in the interlocking section of the U-rib; Step S2: Perform U-rib repair welding using the internal welding device according to claim 8.

10. The U-rib reinforcement method according to claim 9, characterized in that, Step S1 includes: Step S1-1: Determine the parallel U-rib groups that need to be reinforced on the top or bottom plate of the steel box girder; Step S1-2: According to the construction progress, the U-ribs in the U-rib group are numbered according to the two U-ribs that are adjacent in the longitudinal position, and the numbers are odd-numbered rib groups and even-numbered rib groups. Step S1-3: Draw lines according to the staggered opening method to determine the opening position, wherein the opening position corresponds to the intercalation segment of the U-rib; Steps S1-4: Plan the construction date and make construction holes at the marked positions for both odd-numbered and even-numbered rib groups. The layout and line drawing method using staggered openings in steps S1-3 must meet at least one of the following conditions:

1. The opening centers of adjacent U-ribs are not on the same cross-section; 2. There is at most one opening on any cross-section of the U-rib.

11. The U-rib reinforcement method according to claim 10, characterized in that, The openings on two adjacent U-ribs of each rib group are staggered longitudinally by a predetermined distance, and The distance of the longitudinal misalignment is an integer multiple of the length of the U-rib.

12. The U-rib reinforcement method according to claim 9, characterized in that, Step S2 includes: Step S2-1: Insert the inner welding device into the U-rib from the opening in step S1 and use the inner welding device to weld the non-repaired section of the U-rib; and Step S2-2: Continue to use the internal welding device to weld the U-rib patch section.

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