Repair method for in-service steel box girder, u-rib internal welding vehicle and u-rib repair apparatus

Abstract

Provided in the present invention are a repair method for an in-service steel box girder, a U-rib internal welding vehicle and a U-rib repair apparatus. A U-rib is provided with a construction window for repairing the steel box girder. The method comprises the following steps: S1, cutting a sealing plate of the U-rib in an extension direction of the U-rib on two sides of the construction window; and S2, the repair apparatus travelling in the extension direction of the U-rib and performing a repair operation on an area to be repaired of the U-rib by means of a notch formed by cutting in S1. In the present disclosure, by means of cutting the sealing plate in the U-rib, access to the U-rib can be achieved through one U-rib construction window, so as to repair a plurality of U-rib bridge units, thereby reducing the number of windows on the U-rib and reducing damage to a bridge structure. Furthermore, workers do not need to enter the U-rib for construction, thereby improving the safety and convenience.

Description

A repair method for in-service steel box girders, a U-rib internal welding vehicle, and U-rib repair equipment. Technical Field

[0001] This invention belongs to the field of bridge engineering, specifically relating to a repair method for in-service steel box girders, a U-rib internal welding vehicle, and U-rib repair equipment. Background Technology

[0002] Currently, the main structural form of steel bridges in my country is longitudinal orthogonal steel structure, and U-ribs are an important part of traditional orthogonal steel structure bridges. Due to technological limitations, many U-rib steel structure bridges built in the early days of my country only had single-sided welding on the outside of the U-rib plate unit, without welding the inner corners of the U-rib plate unit. This resulted in insufficient strength of the bridges, making them prone to cracking after long-term use and causing significant safety hazards, requiring timely maintenance.

[0003] When maintaining in-service steel box girder bridges, welding is required at the inner corners of the U-ribs and steel plates. However, the U-ribs are relatively long, and manual welding requires creating multiple work windows on the U-ribs. If only one or a few work windows are created on the U-ribs, the sealing plates inside the U-ribs will hinder the welding work. Furthermore, manual welding inside the U-ribs is inconvenient, and the welding wire is difficult to carry. These factors make the internal welding maintenance of steel box girders difficult. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a repair method for in-service steel box girders, a U-rib welding vehicle, and U-rib repair equipment.

[0005] This disclosure provides a method for repairing in-service steel box girders, wherein the U-ribs are provided with construction windows for repairing the steel box girders, and the method includes the following steps:

[0006] S1. Cut the sealing plate of the U-rib along the extension direction of the U-rib on both sides of the construction window;

[0007] S2. The repair equipment travels along the extension direction of the U-rib and passes through the notch formed in S1.

[0008] Repair work is carried out on the area of ​​the U-rib to be repaired.

[0009] In some embodiments of this disclosure, step S1 includes the following steps:

[0010] S1-1. A cutting device for cutting the sealing plate that needs to be opened in the U-rib is placed on a lifting platform, which is located on the ground below the construction window.

[0011] S1-2. Raise the lifting platform to a height that allows the cutting equipment to smoothly enter the interior of the U-rib;

[0012] S1-3. Start the cutting device so that the cutting device cuts the sealing plate to be opened inside the U-rib along the extension direction of the U-rib.

[0013] In some embodiments of this disclosure, in S1-3, when there are multiple open sealing plates, all the cut-off sealing plates have the same shape and size.

[0014] In some embodiments of this disclosure, in S1-3, when there are multiple sealing plates to be opened along one extension direction of the U-rib, the cutting-off sealing plates decrease sequentially according to a set inward reduction dimension a, and the height Hn of the sealing plate n and its order n closest to the construction window satisfy the following formula:

[0015] Hn = H1 - a × (n-1)

[0016] Wherein, sealing plate n is the nth sealing plate that needs to be opened along the extension direction of the U-rib on both sides of the construction window, and n is a positive integer; a is the inward dimension; H1 is the height of the first sealing plate portion that is cut off; Hn is the height of the nth sealing plate portion that is cut off; Hn is not less than the minimum height that the cutting equipment, magnetic suction equipment, and welding equipment can pass through.

[0017] In some embodiments of this disclosure, S1 further includes:

[0018] S1-4. Place the cut-off cover plate from S1-3 in the designated position.

[0019] In some embodiments of this disclosure, steps S1-4 include the following steps:

[0020] S1-4-1. Place the magnetic suction device for removing the sealing plate cut off in S1-3 on the lifting platform, which is located on the ground below the construction window;

[0021] S1-4-2. Raise the lifting platform to a height that allows the magnetic suction device to smoothly enter the interior of the U-rib;

[0022] S1-4-3. Activate the magnetic attraction device so that the magnetic attraction device magnetically attracts the sealing plate cut off in S1-3 along the extension direction of the U-rib inside the U-rib. By extending, rotating or other operations of the electromagnet device of the magnetic attraction device, the cut-off sealing plate is placed from the cut to the designated position.

[0023] In some embodiments of this disclosure, when there are multiple sealing plates that need to be opened, S1 is repeated until all the sealing plates that need to be opened are cut.

[0024] In some embodiments of this disclosure, the following steps are also included:

[0025] S3. Reinstall the sealing plate that was cut off in S1;

[0026] S4. Reseal the sealing plate that was reinstalled in S3.

[0027] In some embodiments of this disclosure, S4 includes:

[0028] S4-1. Place the welding equipment used for welding and sealing the sealing plate that was put back into place in step S3 on the lifting platform. The lifting platform is set on the ground below the construction window.

[0029] S4-2. Raise the lifting platform to a height that allows the welding equipment to smoothly enter the U-rib;

[0030] S4-3. Start welding, so that the welding equipment is sent inside the U-rib along the extension direction of the U-rib to the sealing plate that was put back in place in step S3, and the sealing plate is welded and sealed.

[0031] S4-4. After the welding seal is completed, move the welding equipment back to the lifting platform and lower the lifting platform to the initial height to remove the welding equipment.

[0032] In some embodiments of this disclosure, step S2 includes:

[0033] Place the welding equipment on the lifting platform and raise the platform to a height that allows the welding equipment to smoothly enter the interior of the U-rib. Start the welding equipment and move it along the extension direction of the U-rib to be repaired to the starting point. Then start the welding program, so that during the return process, the welding equipment welds the inner corner of the U-rib and the area to be repaired along the extension direction of the U-rib. After welding is completed, move the welding equipment back onto the lifting platform and lower the platform to the initial height to remove the welding equipment.

[0034] In some embodiments of this disclosure, the construction window is located at the connection position of two adjacent U-ribs.

[0035] In some embodiments of this disclosure, a sealing plate is provided inside the U-rib, and the construction window is opened on the U-rib near the sealing plate.

[0036] In some embodiments of this disclosure, the method for opening the construction window includes:

[0037] Cut a section of any U-rib in the middle of the steel box girder to form two sections, creating an opening at the cut point, which serves as the construction window.

[0038] This disclosure also proposes a repair system for in-service steel box girders, including repair equipment. The repair system is used to implement the repair method for in-service steel box girders according to any embodiment of this disclosure. The repair system further includes:

[0039] The cutting equipment cuts the sealing plate of the U-rib along the extension direction of the U-rib on both sides of the construction window.

[0040] In some embodiments of this disclosure, the repair system further includes:

[0041] A magnetic attraction device is used to magnetically attract the cut-off sealing plate inside the U-rib along the extension direction of the U-rib. By extending, rotating, or performing other operations on the electromagnet device of the magnetic attraction device, the cut-off sealing plate can be placed in a designated position.

[0042] In some embodiments of this disclosure, the repair system further includes:

[0043] A lifting platform is set on the ground below the construction window, and the cutting equipment and / or the magnetic suction device are placed on the lifting platform;

[0044] Raise the lifting platform to a height that allows the cutting device and / or the magnetic suction device to smoothly enter the interior of the U-rib.

[0045] In some embodiments of this disclosure, the repair system further includes:

[0046] The device includes a wire hole and a plug-in module. The wire hole is located at the bottom or side wall of the U-rib where the sealing plate to be opened is located. The plug-in module forms the power receiving end of the cutting device and / or the magnetic attraction device. The output end of the power supply system is plugged into the plug-in module through the wire hole to supply power to the cutting device and / or the magnetic attraction device.

[0047] In some embodiments of this disclosure, the repair system further includes:

[0048] The reloading equipment and sealing equipment are used to reload the cut-off sealing plate back into the notch where it was cut.

[0049] The sealing device restores the seal by reinstalling the cut-off sealing plate from the reinstallation device.

[0050] This disclosure also proposes a U-rib internal welding machine for welding steel box girders, comprising:

[0051] The first vehicle body travels within the U-rib along the length of the U-rib, and a wire spool and a wire feeding mechanism are provided on the first vehicle body.

[0052] The second vehicle body is located in front of the first vehicle body, and the welding torch is mounted on the second vehicle body;

[0053] in,

[0054] The welding wire spool can rotate freely around its central axis, and the welding wire is wound on the welding wire spool;

[0055] The wire feeding mechanism includes a wire feeding pressure roller and a wire feeding drive roller, which are used to feed the welding wire wound on the welding wire spool to the welding gun. The point where the welding wire leaves the welding wire spool is the discharge point of the welding wire spool. The welding wire enters between the wire feeding pressure roller and the wire feeding drive roller from a direction with an angle of less than 30 degrees with the tangent at the discharge point.

[0056] In some embodiments of this disclosure, the wire feeding mechanism includes: two pairs of wire feeding pressure rollers and the wire feeding drive rollers;

[0057] The inlet tube and outlet tube are located in front of and behind the two pairs of wire feeding pressure rollers and the wire feeding drive rollers;

[0058] The wire feeding tube is located between the two pairs of wire feeding pressure rollers and the wire feeding drive rollers.

[0059] In some embodiments of this disclosure, the wire feeding structure further includes:

[0060] Drive motor;

[0061] A speed reducer, comprising a housing and a set of reduction gears located within the housing;

[0062] The housing includes a base and a cover plate. The base is provided with a motor shaft hole, and the cover plate is provided with two output shaft holes.

[0063] The output shaft of the drive motor enters the housing through the motor shaft hole and connects to the input shaft of the reduction gear set. The input shaft of the reduction gear set is connected to the two output shafts of the reduction gear set through a multi-stage gear. The two output shafts of the reduction gear set rotate at the same speed. The output shafts of the two reduction gear sets pass through the two output shaft holes and exit the housing, and then each of them is fixed with a wire feeding drive wheel. The wire feeding pressure wheel is installed on the outside of the housing.

[0064] In some embodiments of this disclosure, the housing of the reducer is mounted on a pad, and the mounting surface of the pad on which the housing is mounted is inclined to the ground of the first vehicle body.

[0065] In some embodiments of this disclosure, the discharge point of the welding wire on the welding wire spool is located below the welding wire spool, and the wire feeding mechanism is mounted upwards on the pad.

[0066] In some embodiments of this disclosure, the pad is made of an insulating material.

[0067] In some embodiments of this disclosure, the angle of the mounting surface of the pad changes with the position of the discharge point.

[0068] In some embodiments of this disclosure, it also includes:

[0069] The first upper top wheel is pressed tightly against the top plate when the vehicle body moves within the U-rib. The first upper top wheel is connected to the output end of a cylinder or hydraulic cylinder.

[0070] In some embodiments of this disclosure, a drive wheel and a driven wheel are mounted on the bottom of the vehicle body, and the first top wheel is located directly above the drive wheel.

[0071] In some embodiments of this disclosure, two welding torches are mounted on the second vehicle body, and the welding torches are used to weld the two gaps between the U-rib and the steel plate, respectively.

[0072] The central axes of the two welding wire spools coincide;

[0073] The wire feeding pressure rollers of the two wire feeding mechanisms are coaxial, and the wire feeding drive wheel is coaxial.

[0074] This disclosure also proposes a U-rib repair device for in-service bridges, comprising:

[0075] The second vehicle body is used to travel within the U-rib along the length of the U-rib;

[0076] A travel guidance unit, installed on the second vehicle body, is used to guide the second vehicle body;

[0077] A welding torch position adjustment unit is provided, with a welding torch installed at each end of the welding torch position adjustment unit. The welding torch position adjustment unit is used to adjust the position of the welding torch in a plane perpendicular to the length direction of the U-rib. Two welding torch position adjustment units are arranged in the left and right directions of the second vehicle body, and each welding torch points to the weld seam on the same side.

[0078] A welding torch position guide unit includes an upper guide wheel and a side guide wheel. The upper guide wheel and the side guide wheel rotate freely along their respective axles. The axles of the upper guide wheel and the side guide wheel are connected to the welding torch position adjustment unit. The circumferential surface of the upper guide wheel presses against the upper wall of the U-rib, and the circumferential surface of the side guide wheel presses against the side wall of the U-rib. One welding torch position guide unit is configured for each of the two welding torch position adjustment units, and the side guide wheel on each welding torch position adjustment unit presses against the side wall on the same side as it.

[0079] In some embodiments of this disclosure, the welding torch position adjustment unit includes:

[0080] A first linear output device is connected to the second vehicle body, and the linear displacement output by the first linear output device is located in a plane perpendicular to the length direction of the U-rib.

[0081] A second linear output device is connected to the end of the first linear output device. The linear displacement output by the second linear output device is located in a plane perpendicular to the length direction of the U-rib and is different from the linear displacement output by the first linear output device.

[0082] In some embodiments of this disclosure, the axle of the upper guide wheel is connected to the output end of the first linear output device;

[0083] The axle of the side guide wheel is connected to the output end of the second linear output device;

[0084] The first linear output device and the second linear output device are pneumatic cylinders or hydraulic cylinders, and the displacement change of the output end of the first linear output device and the second linear output device makes the load they are subjected to constant.

[0085] In some embodiments of this disclosure, the cylinder of the first linear output device is tilted outward relative to the vertical direction;

[0086] The cylinder of the second linear output device is arranged horizontally.

[0087] In some embodiments of this disclosure, the output end of the first linear output device is connected to a transverse base, the bottom surface of the transverse base is perpendicular to the cylinder of the first linear output device, and the top surface of the transverse base is horizontal.

[0088] The transverse base is provided with a transverse slide rail, and a slider is provided on the transverse slide rail. A drive motor is installed on the slider, and the output end of the drive motor is connected to the welding gun.

[0089] In some embodiments of this disclosure, one of the cylinders of the second linear output device of the two welding torch position adjustment units is located above the transverse slide rail, and the other is located below the transverse slide rail.

[0090] In some embodiments of this disclosure, the bottom of the second vehicle body is provided with driven wheels and two pairs of driving wheels;

[0091] The driven walking wheel is located between the two first linear output devices;

[0092] The two pairs of drive wheels are arranged one in front of the other.

[0093] In some embodiments of this disclosure, the walking guide unit includes two walking guide wheels arranged symmetrically on the left and right sides, the circumferential surfaces of the walking guide wheels are pressed against the sidewalls of the U-rib, and the axles of the walking guide wheels are connected to the output end of the third linear output device;

[0094] The third linear output device is a pneumatic cylinder or a hydraulic cylinder, and the displacement change of the output end of the third linear output device keeps the load it receives constant.

[0095] In some embodiments of this disclosure, a travel guide wheel bracket is connected to each pair of drive axles, and the top of the bracket is connected to the travel guide wheel.

[0096] In some embodiments of this disclosure, the walking guide device further includes a second upper top wheel, the circumferential surface of which is pressed against the upper wall of the U-rib, and the axle of the second upper top wheel is connected to the output end of the fourth linear output device;

[0097] The fourth linear output device is a pneumatic cylinder or a hydraulic cylinder, and the displacement change of the output end of the fourth linear output device keeps the load it receives constant.

[0098] The cylinder of the fourth linear output device is mounted on the upper top device base, which is higher than the bottom of the second vehicle body.

[0099] In some embodiments of this disclosure, a mounting plate is provided behind the welding torch position adjustment unit, and a camera and a lighting lamp are provided on the mounting plate. The field of view of the camera and the lighting lamp includes the nozzle of the welding torch.

[0100] In some embodiments of this disclosure, the U-rib repair device for in-service bridges further includes:

[0101] The first vehicle body travels within the U-rib along the length of the U-rib. The first vehicle body is equipped with a welding wire spool and a wire feeding mechanism. The first vehicle body is located behind the second vehicle body.

[0102] in,

[0103] The welding wire spool can rotate freely around its central axis, and the welding wire is wound on the welding wire spool;

[0104] The wire feeding mechanism includes a wire feeding pressure roller and a wire feeding drive roller, which are used to feed the welding wire wound on the welding wire spool to the welding gun. The point where the welding wire leaves the welding wire spool is the discharge point of the welding wire spool. The welding wire enters between the wire feeding pressure roller and the wire feeding drive roller from a direction with an angle of less than 30 degrees with the tangent at the discharge point. Beneficial effects

[0105] 1. The repair method and system for in-service steel box girders provided by this invention, according to actual construction needs, involves cutting the sealing plates within the U-ribs that need to be opened along the extension direction of the U-ribs on both sides of the construction window. The notches formed after cutting allow the spaces inside the U-ribs on both sides of the sealing plate to be interconnected. The repair equipment is then moved along the extension direction of the U-ribs and enters the interconnected internal space of the U-ribs through the notches to perform repair work on the area to be repaired. The repair method provided by this invention, by cutting the sealing plates that need to be opened in the U-ribs, increases the maximum length for the repair equipment to perform repair work within a single construction window, i.e., increases the construction distance of a construction section. This significantly reduces the number of construction windows opened on the entire bridge, reducing damage to the in-service bridge caused by the repair itself and extending the service life of the in-service bridge. Simultaneously, the reduction in the number of construction windows also reduces the degree of manual intervention during bridge repair, reducing the possibility of operator injuries or fatalities during bridge repair; lowering labor costs and ensuring maximum economic benefits.

[0106] 2. The U-rib welding carriage provided by the present invention has a wire spool and a wire feeding mechanism located on a first carriage body. The wire enters between the wire feeding pressure wheel and the wire feeding drive wheel from a direction with an angle of less than 30 degrees to the tangent at the discharge point. The change between the wire output angle of the wire spool and the wire feeding angle of the wire feeding mechanism is reduced, and the wire feeding is smoother.

[0107] 3. The U-rib internal welding equipment for in-service bridges provided by this invention includes: a traveling guide unit, installed on a vehicle body, for guiding the vehicle body; a welding torch position adjustment unit, each end of which is equipped with a welding torch, the welding torch position adjustment unit being used to adjust the position of the welding torch in a plane perpendicular to the length direction of the U-rib; two welding torch position adjustment units are arranged in the left-right direction of the vehicle body, each welding torch pointing to the weld seam on the same side, and each of the two welding torch position adjustment units is equipped with a welding torch position guide unit. The welding torch guide unit can directly guide its welding torch position adjustment unit, so that the welding torches on both sides are aligned with the weld seam position on the same side in real time, which can cope with the deformation of the U-rib of the in-service bridge, thereby improving the welding quality. Attached Figure Description

[0108] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0109] Figure 1 is a schematic diagram of the U-rib plate unit structure of an in-service bridge according to the present invention;

[0110] Figure 2 is a schematic diagram of the construction window opening of the present invention;

[0111] Figure 3 is a schematic diagram of the cutting device of the present invention cutting the sealing plate inside the U-rib;

[0112] Figure 4 is a schematic diagram of the manual cutting of the first left sealing plate and the first right sealing plate according to the present invention;

[0113] Figure 5 is a schematic diagram of the first left U-rib plate unit containing the cutting equipment in this invention;

[0114] Figure 6 is a schematic diagram of the first left U-rib plate unit of the magnetic suction device of the present invention.

[0115] Figure 7 is a schematic diagram of the continuous cutting operation of the cutting device of the present invention;

[0116] Figure 8 is a schematic diagram of the continuous cutting operation of the cutting device of the present invention;

[0117] Figure 9 is a schematic diagram of the welding repair work of the welding equipment of the present invention;

[0118] Figure 10 is a schematic diagram of the magnetic suction device of the present invention reinstalling the sealing plate;

[0119] Figure 11 is a schematic diagram of the construction window reinstallation process of the present invention;

[0120] Figure 12 is a schematic diagram illustrating the wire hole of the present invention;

[0121] Figure 13 is a schematic diagram illustrating the size of the notch cut in the sealing plate according to the present invention;

[0122] Figure 14 is a schematic diagram of the first body structure of a U-rib internal welding vehicle provided in Embodiment 1;

[0123] Figure 15 is a schematic diagram of the wire feeding mechanism in Example 1;

[0124] Figure 16 is a structural schematic diagram of the wire feeding mechanism from another perspective in Embodiment 1;

[0125] Figure 17 is a schematic diagram of the internal structure of the reducer of the wire feeding mechanism in Example 1;

[0126] Figure 18 is a schematic diagram of the welding wire spool in Example 1;

[0127] Figure 19 is a cross-sectional schematic diagram of the welding wire spool in Example 1;

[0128] Figure 20 is a schematic diagram of a U-rib internal welding car structure provided in Embodiment 1;

[0129] Figure 21 is a structural schematic diagram of the U-rib repair device for in-service bridges provided in Example 1;

[0130] Figure 22 is a partial structural schematic diagram of the U-rib repair equipment for in-service bridges provided in Example 1;

[0131] Figure 23 is a schematic diagram of the structure in Figure 2 from another perspective;

[0132] Figure 24 is a schematic diagram of the structure in Figure 2 from a top-down view;

[0133] Figure 25 is a schematic diagram of the front part of the U-rib repair equipment for an in-service bridge provided in Example 1. Detailed Implementation

[0134] 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 these embodiments 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. Example 1

[0135] Throughout this article, unless otherwise specified, as shown in Figure 1, the U-ribs mentioned are generally used in orthogonal steel structure bridges and are a component of the steel box girder. Of course, in certain specific cases, they can also be used in other systems that require U-ribs as standard fasteners. The U-ribs mentioned in this article are welded to the U-rib plate unit during construction using corner welding. Specifically, each pair of adjacent U-rib plate units (e.g., between the second left U-rib plate unit 12 and the first left U-rib plate unit 11, between the first left U-rib plate unit 11 and the first right U-rib plate unit 21, between the first right U-rib plate unit 21 and the second right U-rib plate unit 22, etc.) has a butt weld due to welding connection. Similarly, each pair of connected U-ribs (e.g., between left U-rib 2 and left U-rib 1, between left U-rib 1 and right U-rib 1, between right U-rib 1 and right U-rib 2, etc.) also has a weld due to welding connection. In most existing in-service steel structure bridges containing U-ribs, each U-rib has a sealing plate at both ends. Centered on the construction window 6, along the extension direction of the left U-rib to be repaired... The first left U-rib plate unit 11 has a first left sealing plate 31 and a second left sealing plate 32; the second left U-rib plate unit 12 has a third left sealing plate 33 and a fourth left sealing plate 34; the third left U-rib plate unit has a fifth left sealing plate 35 and a sixth left sealing plate... the nth left U-rib plate unit has a 2n-1th left sealing plate and a 2nth left sealing plate; along the extension direction of the right side U-rib to be repaired, the first right U-rib plate unit 21 has a first right sealing plate 41 and a second right sealing plate 42; the second right U-rib plate unit 22 has a third right sealing plate 43 and a fourth right sealing plate 44; the third right U-rib plate unit has a fifth right sealing plate 45 and a sixth right sealing plate... the nth right U-rib plate unit has a 2n-1th right sealing plate and a 2nth right sealing plate. A steel liner 5 is provided on the inner surface of the U-rib at the butt weld of adjacent U-ribs (as shown in Figure 1). When welding the U-ribs (welding the U-rib plate unit instead of the inner and outer corners of the U-rib), the metal liner 5 needs to be welded first to fix the U-rib plate unit.

[0136] Furthermore, the term "in service" as used in this article, unless otherwise stated, refers to a situation where the bridge has been built, has been used, is currently in use, or is about to be used, that is, the U-rib is in a bridge or other system structure that is in use.

[0137] According to a first aspect of the present invention, a method for repairing in-service steel box girders is provided. This method is particularly suitable for internal welding repair of U-ribs in in-service steel structure bridges. It employs a repair method combining a cutting device 81, a magnetic suction device 82, and a welding device 83. It fully utilizes the existing construction windows 6, using the cutting device 81 and the magnetic suction device 82 alternately to cut and reposition the sealing plates that need to be opened within the U-rib. Repositioning can mean removing the sealing plate from the U-rib through the construction window 6 or placing it in a suitable designated position within the U-rib's internal space, as long as the repositioning of the cut sealing plate does not affect the gaps formed by subsequent cutting. This significantly reduces the number of construction windows 6 opened on the entire bridge, increases the maximum length that the welding device 83 can repair in each construction window 6, and reduces the damage to the in-service bridge caused by the welding repair itself.

[0138] Specifically, the preceding steps can be:

[0139] Construction window 6 is opened (as shown in Figure 2): Construction window 6 for welding repair is opened on the in-service U-rib. The construction window 6 is opened between two partitions on both sides of the weld seam of the U-rib, and at the same time on both sides of the butt weld seam of the corresponding U-rib plate unit.

[0140] Cut and remove the sealing plates on both sides of the construction window 6 (as shown in Figure 4): Cut the first left sealing plate 31 and the first right sealing plate 41 on both sides of the construction window 6 manually and remove the cut-off first left sealing plate 31 and the first right sealing plate 41.

[0141] Grinding: Grind the cutting boundaries of the first left sealing plate 31, the first right sealing plate 41, and the U-rib;

[0142] Cleaning: Clean the inside of the U-rib.

[0143] Following the above steps, the method provided by this invention includes the following steps:

[0144] S1. Cut the sealing plate that needs to be opened inside the U-rib along the extension direction of the U-rib on both sides of the construction window 6 (as shown in Figure 3).

[0145] Centered on the construction window 6, the first left sealing plate 31 of the left U-rib 1 and the first right sealing plate 41 of the right U-rib 1, which are closest to each other on both sides of the construction window 6, have been cut and removed. The specific location of the U-rib to be repaired determines the trajectory of the welding equipment 83 within the U-rib; therefore, it is necessary to open up the sealing plates within the U-rib that obstruct the movement of the welding equipment 83 during repair. In other words, once the specific location of the U-rib to be repaired is determined, the sealing plates within the U-rib that need to be cut and repositioned are also determined.

[0146] Specifically, the following steps can be taken:

[0147] S1-1. The cutting equipment 81 used to cut the sealing plate that needs to be opened in the U-rib is placed on the lifting platform, which is set on the ground below a construction window 6.

[0148] S1-2. Raise the lifting platform to a height that allows the cutting equipment 81 to smoothly enter the U-rib;

[0149] S1-3. Start the cutting device 81, so that the cutting device 81 cuts the required sealing plate inside the U-rib along the extension direction of the U-rib (as shown in Figure 5). If step S1 is used multiple times, the second left sealing plate 32, the third left sealing plate 33, ..., the nth left sealing plate can be obtained sequentially from the left side of the construction window 6 (as shown in Figure 7); the second right sealing plate 42, the third right sealing plate 43, ..., the nth right sealing plate can be obtained sequentially from the right side of the construction window 6. After cutting is completed, move the cutting device 81 back to the lifting platform and lower the lifting platform to the initial height, and take out the cutting device 81.

[0150] Here, the specific method for placing the cut-off sealing plate in the designated position is to remove the cut-off sealing plate from inside the U-rib. After each sealing plate is cut within the U-rib, the cutting device 81 needs to return to its initial position at the construction window 6 inside the U-rib. Only after the cut-off sealing plate is placed in the designated position can subsequent sealing plates to be opened in the same direction be cut as needed. To improve the efficiency of cutting the sealing plates, one sealing plate can be cut in each of the two extending directions on either side of the U-rib, centered on the construction window 6, before removing the cutting device 81.

[0151] A cutting program can be pre-set for the cutting device 81 so that the cutting device 81 cuts sealing plates with the required shape and size. When multiple sealing plates need to be cut, the shape and size of the sealing plates cut off by the cutting device 81 can be the same, different, or even vary in a certain pattern (as shown in Figure 13). Although there are no fixed requirements for the shape and size of the sealing plates to be cut off, since the sealing plates to be cut off in the same direction as the U-rib extension need to pass through the notch left by the previously cut sealing plates, the sealing plates to be cut off in the same direction as the U-rib extension are smaller than the previously cut sealing plates (for example, the notch left by cutting the first left sealing plate 31 allows the cut second left sealing plate 32 to pass through, the notch left by cutting the second left sealing plate 32 allows the cut third left sealing plate 33 to pass through, and so on). Furthermore, the cut-off sealing plates that need to be opened must pass through the steel gasket 5 located at the butt weld between the U-rib plate units when they are removed from the U-rib. Therefore, the size of all the cut-off sealing plates is also limited by the size and shape of the gap in the steel gasket 5. The gap left by the cut-off sealing plates needs to be passed through the welding equipment 83. Therefore, the size of all the cut-off sealing plates that need to be opened is also limited by the size and shape of the welding equipment 83.

[0152] As a cutting and sealing plate scheme, in S1-3, when there are multiple sealing plates that need to be opened along one extension direction of the U rib, the sealing plates that need to be cut off decrease sequentially according to the set inward reduction dimension a. The height Hn of the sealing plate n and its order n closest to the construction window 6 satisfy the following formula:

[0153] Hn = H1 - a × (n-1)

[0154] Wherein, sealing plate n is the nth sealing plate that needs to be opened along the extension direction of the U-ribs on both sides of the construction window 6, and n is a positive integer; a is the inward dimension; H1 is the height of the first sealing plate portion that is cut off; Hn is the height of the nth sealing plate portion that is cut off; Hn is not less than the minimum height that the cutting equipment 81, magnetic suction equipment 82, and welding equipment 83 can pass through.

[0155] S1-4. Place the cut-off sealing plate from S1-3 in the designated position:

[0156] Steps S1-4 and S1-3 are two related steps, and the number of steps in steps S1-4 and S1-3 is the same. Each time step S1-3 is completed to cut a sealing plate and step S1-4 is completed to remove the sealing plate from the U-rib, the space inside the U-rib on both sides of the sealing plate is connected, which increases the maximum construction length using construction window 6, thereby reducing the number of construction windows 6 to be opened and reducing the damage to the in-service bridge caused by the welding repair process. Of course, it is not necessary to remove the cutting sealing plate from the inside of the U-rib through construction window 6. The sealing plate can also be placed in a suitable designated position inside the U-rib, as long as it can be placed in a way that does not affect the gap formed by subsequent equipment cutting.

[0157] Specifically, as shown in Figure 6, the following steps can be taken:

[0158] S1-4-1. Place the magnetic suction device 82, which is used to remove the sealing plate that was cut off in S1-3, on the lifting platform. The lifting platform is set on the ground below the construction window 6.

[0159] S1-4-2. Raise the lifting platform to a height that allows the magnetic suction device 82 to smoothly enter the U-rib;

[0160] S1-4-3. Start the magnetic attraction device 82 so that the magnetic attraction device 82 magnetically attracts the required opening sealing plate that was cut off in S1 along the extension direction of the U rib inside the U rib. By performing operations such as extension, rotation and extension of the electromagnet device 821 of the magnetic attraction device 82, the required opening sealing plate that was cut off is taken out from the cut.

[0161] S1-4-4, Magnetic adsorption ends. The magnetic adsorption device 82, which adsorbs the required opening sealing plate cut off in S1-3, is run back onto the lifting platform and the lifting platform is lowered to the initial height. The magnetic adsorption device 82 is then removed.

[0162] As a specific solution for cutting and placing sealing plates, the cutting function of the cutting device 81 and the adsorption function of the magnetic device 82 can be combined into a single device. Specifically, an electromagnet device 821 capable of extension, rotation, and other operations can be installed on the cutting device 81. Using the cutting device 81 equipped with the electromagnet device 821, the electromagnet device 821 can be activated to adsorb the sealing plate after each cut. When the cutting device 81 is initiated to return, the sealing plate adsorbed by the electromagnet device 821 will be brought back along with it. This design eliminates the need to separately activate the magnetic device 82 to adsorb and bring back the sealing plate, significantly reducing construction time and further improving overall work efficiency.

[0163] When multiple panels need to be activated, the method also includes the following steps:

[0164] Repeat step S1 until all the required opening plates have been cut.

[0165] As the sealing plates that need to be opened are removed one by one, the sealing plates that need to be opened later are further and further away from the construction window 6. When the cutting equipment 81 and the magnetic suction equipment 82 are started to operate on the sealing plates that need to be opened later, a long transmission line needs to be dragged in the U-rib at the tail. The long transmission line has a considerable weight, which will affect the normal operation of the cutting equipment 81, the magnetic suction equipment 82 and other equipment.

[0166] As shown in Figures 8, 9, and 10, to solve the aforementioned problems, this invention provides a solution where the power receiving end of devices such as the cutting device 81 and the magnetic suction device 82 is configured as a plug-in module 9. Specifically, the plug-in module 9 can be located in the middle of the side wall of devices such as the cutting device 81 and the magnetic suction device 82. As shown in Figure 12, a wire-passing hole 100 is provided at the bottom or side wall of the U-rib where the sealing plate to be opened is located. The output end of the power supply system 7 is plugged into the plug-in module 9 through the wire-passing hole 100 to supply power to devices such as the cutting device 81 and the magnetic suction device 82.

[0167] The shape of the wire passage hole 100 is not particularly limited; it can be a circular, square, or elongated through hole. The number of wire passage holes 100 can be multiple, distributed along the extension direction of the U-rib, as needed. The primary function of the wire passage hole 100 is to allow the power transmission lines of equipment such as the cutting device 81 and the magnetic suction device 82 to pass through. Depending on the actual application scenario, the size of the wire passage hole 100 on the U-rib can be several centimeters or even tens of centimeters. Compared to the opening of the construction window 6, the damage caused by the opening of the wire passage hole 100 to the bridge in service is almost negligible.

[0168] As shown in Figure 9, S2, the repair equipment travels along the extension direction of the U-rib and passes through the notch formed in S1 to perform repair work on the area of ​​the U-rib to be repaired. The repair equipment can be welding equipment 83.

[0169] Grinding: Grind the excess height of the butt weld of the U-rib plate unit and the steel backing 5; grind the area to be repaired inside the U-rib.

[0170] Cleaning: Clean the interior of the interconnected U-ribs after the sealing panels have been cut and arranged.

[0171] Welding repair: The welding equipment 83 is sent to the U-rib, which is connected in space, to perform welding repair on the area to be repaired.

[0172] This step is existing technology and will not be elaborated on here.

[0173] As shown in Figure 10, S3, reinstall the sealing plate that was cut off in step S1, which may include the following steps:

[0174] S3-1. Place the magnetic suction device 82, which adsorbs the sealing plate that needs to be opened and cut off in S1, on the lifting platform. The lifting platform is set on the ground below the construction window 6.

[0175] S3-2. Raise the lifting platform to a height that allows the magnetic suction device 82 to smoothly enter the U-rib;

[0176] S3-3. Start the magnetic suction device 82, so that the magnetic suction device 82 is sent inside the U-rib along the extension direction of the U-rib to the original cut position of the sealing plate that it is attracted inside the U-rib. Perform operations such as extension, rotation and extension of the electromagnet device 821 of the magnetic suction device 82 to put the sealing plate back to the original cut position.

[0177] S3-4. After the magnetic attraction ends, move the magnetic attraction device 82 back onto the lifting platform and lower the lifting platform to the initial height to remove the magnetic attraction device 82.

[0178] The main function of the inner sealing plate of the U-rib is to isolate the internal space formed by the U-rib and its corresponding U-rib plate unit from the external space, minimizing the flow of air inside the U-rib and preventing external dust, leaves, and other debris from entering. This slows down the oxidation rate inside the U-rib, thereby extending the service life of the bridge. Therefore, after completing welding and other repair work on an in-service steel structure bridge, it is necessary to reinstall and seal the cut and placed sealing plates.

[0179] S4. Reseal the sealing plate that needs to be opened in S3. This may include the following steps:

[0180] S4-1. The welding equipment 83 used for welding and sealing the sealing plate that was put back into place in step S3 is placed on the lifting platform, which is set on the ground below the construction window 6.

[0181] S4-2. Raise the lifting platform to a height that allows the welding equipment 83 to smoothly enter the U-rib;

[0182] S4-3. Start welding, so that the welding equipment 83 is sent inside the U-rib along the extension direction of the U-rib to the sealing plate that was put back to its original position in step S5, and the sealing plate is welded and sealed.

[0183] S4-4. After the welding seal is completed, move the welding equipment 83 back onto the lifting platform and lower the lifting platform to the initial height, then remove the welding equipment 83.

[0184] As a solution for reinstalling and sealing the sealing plate, the surface of the sealing plate to be reinstalled can be coated with an adhesive or magnetic material. A magnetic trolley can then be used to reinstall the sealing plate while simultaneously sealing the cut. Since the purpose of the sealing plate is to isolate the internal space of the U-rib from the outside environment, preventing dust and other debris from entering and causing oxidation, the strength of the reinstalled sealing plate is not critical. This design eliminates the need to separately start welding equipment 83 to seal the sealing plate, i.e., step S4, significantly reducing construction time and further improving overall work efficiency.

[0185] Repeat steps S3 and S4 until all the required opening plates are reinstalled and sealed.

[0186] Finally, the first left sealing plate 31 and the first right sealing plate 41 on both sides of the construction window 6 are reinstalled and sealed, as shown in Figure 11. The construction window 6 is then welded shut, and the welded areas are post-treated and coated. This is existing technology and can be done manually, so it will not be described in detail here.

[0187] With this, the repair of the steel box girder in the in-service bridge was completed.

[0188] The following example demonstrates the practical application of the method of the present invention through Example 1.

[0189] The steel box girder of an in-service orthogonal steel structure bridge was repaired using the U-rib overhead internal welding method. The operation steps are as follows:

[0190] 1) After determining the length of the construction window 6 and the distance from the top of the construction window 6 to the top of the U-rib side plate, mark the U-rib according to the size and position of the construction window 6. Use plasma arc cutting to cut along the marked lines. The resulting notch is the construction window 6. Take out the cut-off U-rib part.

[0191] 2) The left and right sides of the construction window 6 are connected left U-rib 1 and right U-rib 1. The first left sealing plate 31 of the left U-rib 1 near the construction window 6 and the first right sealing plate 41 of the right U-rib 1 near the construction window 6 are manually cut in sequence, and the cut-off first left sealing plate 31 and first right sealing plate 41 are removed in sequence.

[0192] 3) Grind the removed U-rib portion, the removed cut-off first left sealing plate 31 portion, and the removed cut-off first right sealing plate 41 portion; grind the cut of the construction window 6; grind the cut of the first left sealing plate 31 and the first right sealing plate 41 inside the U-rib; grind the excess height of the butt weld of the in-service bridge U-rib plate unit; grind the steel liner 5 inside the U-rib; grind the area to be repaired inside the U-rib; use a tow truck to clean the inside of the U-rib.

[0193] 4) Place the cutting device 81 on the lifting platform and raise the lifting platform to a height that allows the cutting device 81 to smoothly enter the U-rib. Start the cutting device 81 and move it from the construction window 6 along the extension direction of the U-rib to be repaired to the sealing plate to be opened. Then start the cutting program and cut the sealing plate until a preset cut shape is formed. The cut part of the sealing plate falls into the U-rib. The fallen sealing plate has the same shape as the overall sealing plate and is large enough to pass through the notch of the steel pad 5. The cutting program ends and the return program is started, so that the cutting device 81 returns to the initial position of the construction window 6. Move the cutting device 81 back to the lifting platform and lower the lifting platform to the initial height. Take out the cutting device 81.

[0194] 5) Place the magnetic suction device 82 on the lifting platform and raise the lifting platform to a height that allows the magnetic suction device 82 to smoothly enter the U-rib. Start the magnetic suction device 82 and move it along the extension direction of the U-rib to be repaired to the sealing plate that fell into the U-rib in step 4). Then start the magnetic suction program. After the electromagnet device 821 of the magnetic suction device 82 is powered on, it generates magnetic attraction force, which firmly attracts the sealing plate that fell into the U-rib to the electromagnet device 821. By extending, rotating and other operations on the electromagnet device 821 with the sealing plate attracted, the sealing plate that fell into the U-rib is taken out from the cut in an inclined manner. Start the return program so that the magnetic suction device 82 returns to the initial position of the construction window 6. Move the magnetic suction device 82 back to the lifting platform and lower the lifting platform to the initial height. Take out the magnetic suction device 82.

[0195] 6) Repeat steps 4) and 5) above in sequence. With the construction window 6 as the center, along the extension direction of the U-rib to be repaired (which can be one side or both sides of the construction window 6), sequentially cut and remove the second left sealing plate 32, the third left sealing plate 33... the nth left sealing plate in the left U-rib 2, the left U-rib 3... the left U-rib n connected to the left U-rib 1; cut and remove the second right sealing plate 42, the third right sealing plate 43... the nth right sealing plate in the right U-rib 2, the right U-rib 3... the right U-rib n connected to the right U-rib 1. The size and shape of the cut sealing plates are the same, until all the sealing plates that need to be opened in the U-rib are cut and removed.

[0196] 7) The power receiving ends of the cutting equipment 81, magnetic suction equipment 82, clearing vehicle, welding equipment 83, etc., are all composed of plug-in modules 9. When the sealing plate to be cut is far enough away from the construction window 6, the power cord connected to the cutting equipment 81, magnetic suction equipment 82, etc., located inside the U-rib is too long, which will affect the mobility of the cutting equipment 81, magnetic suction equipment 82, etc. In this case, a wire hole 100 is opened at the bottom or side wall of the U-rib where the sealing plate to be cut is located, and the output end of the power supply system 7 is plugged into the plug-in module 9 through the wire hole 100 to supply power to the cutting equipment 81, magnetic suction equipment 82, clearing vehicle, welding equipment 83, etc.

[0197] 8) Use welding equipment 83 to perform overhead welding on the inside of the U-rib. The specific operation is as follows: First, use a clearing vehicle to clean the inside of the connected U-rib and grind the area to be repaired. Then, place the welding equipment 83 on the lifting platform and raise the lifting platform to a height that allows the welding equipment 83 to smoothly enter the inside of the U-rib. Start the welding equipment 83 and move it along the extension direction of the U-rib to the starting point. Then, start the welding program and, during the return process, weld the inner corner of the U-rib and the required repair position along the extension direction of the U-rib. After the welding is completed, move the welding equipment 83 back to the lifting platform and lower the lifting platform to the initial height. Take out the welding equipment 83.

[0198] 9) The magnetic suction device 82 and welding device 83 are used alternately to sequentially reinstall and seal the cut-out sealing plates. The step of reinstalling the cut-out sealing plates using the magnetic suction device 82 is the reverse process of removing the sealing plates. The magnetic suction device 82, which holds the sealing plates, is transported to the cut position of the sealing plate within the U-rib. The electromagnet device 821 of the magnetic suction device 82 is manipulated to extend, retract, rotate, etc., to reinstall the sealing plate back to the original cut position. The return program is started, and finally, the magnetic suction device 82 is removed. The welding device 83 is transported to the original cut position of the sealing plate within the U-rib. The welding device 83 is used to seal the sealing plate reinstalled at the original cut position. The return program is started, and finally, the welding device 83 is removed. The order of sequential reinstallation and sealing of multiple sealing plates is the reverse of the order of sequential cutting and removal of the sealing plates, namely, the nth left sealing plate, the (n-1)th left sealing plate... the second left sealing plate 32; and the nth right sealing plate, the (n-1)th right sealing plate... the second right sealing plate 42.

[0199] 10) Manually seal the first left sealing plate 31 of the left U-rib 1 near the construction window 6 and the first right sealing plate 41 of the right U-rib 1 near the construction window 6, seal the construction window 6 opened on the U-rib, and perform post-processing on the sealing weld.

[0200] 11) Apply coating to the exterior of the sealing weld of construction window 6.

[0201] According to a second aspect of the present invention, the repair method for in-service steel box girders involves cutting and repairing the sealing plates of the U-ribs using a repair system. By using a lifting platform and the cooperation of cutting equipment 81, magnetic suction equipment 82, and welding equipment 83, the degree of manual intervention in the bridge repair process is reduced, the cost of labor is reduced, economic benefits are maximized, and the occurrence of operator injuries and other situations during the bridge repair process is reduced.

[0202] In some embodiments of the present invention, the construction window may be opened at two adjacent U-rib connection positions.

[0203] Setting the construction window at the connection point of two adjacent U-ribs makes it easier to repair and weld adjacent U-ribs.

[0204] In some embodiments of the present invention, the U-rib is provided with a sealing plate, and the construction window is located on the U-rib near the sealing plate.

[0205] The construction window is positioned close to the sealing plate to facilitate cutting and other operations on the sealing plate, thereby opening up the space between adjacent U-ribs to allow welding equipment to pass through.

[0206] In some embodiments of the present invention, the method for opening a construction window may further include: cutting off a section of a U-rib from the middle of any U-rib in the steel box girder, so that one U-rib is divided into two sections, forming an opening at the cutting position, and using the opening as a construction window.

[0207] An opening formed by cutting a section of the U-rib in the middle serves as a construction window, providing more operating space for welding operations and facilitating repair work.

[0208] This disclosure also proposes a U-rib internal welding machine. Example 2

[0209] Referring to Figures 14 to 20, this embodiment provides a U-rib internal welding car for welding steel box girders, comprising:

[0210] The first vehicle body 8a-3 travels within the U-rib along the length of the U-rib, and the first vehicle body 8a-3 is provided with a wire spool 8a-22 and a wire feeding mechanism 8a-2.

[0211] The second vehicle body 8a-27 is located in front of the first vehicle body 8a-3, and the welding torch 8a-28 is mounted on the second vehicle body 8a-27;

[0212] in,

[0213] The welding wire spool 8a-22 can rotate freely around its central axis, and the welding wire 8a-100 is wound on the welding wire spool 8a-22;

[0214] The wire feeding mechanism 8a-2, located between the welding torch and the wire spool 8a-22, includes a wire feeding pressure roller and a wire feeding drive roller (refer to the wire feeding pressure roller 8a-8 and the wire feeding drive roller 8a-9 in Figure 15). It is used to feed the welding wire 8a-100 wound on the wire spool 8a-22 to the welding torch. The point where the welding wire 8a-100 leaves the wire spool 8a-22 is the discharge point of the wire spool 8a-22. The welding wire 8a-100 enters between the wire feeding pressure roller and the wire feeding drive roller from a direction with an angle of less than 30 degrees to the tangent at the discharge point.

[0215] In this embodiment, the wire spool 8a-22 and the wire feeding mechanism 8a-2 are located on the first vehicle body 8a-3. The wire 8a-100 enters between the wire feeding pressure wheel and the wire feeding drive wheel from a direction with an angle of less than 30 degrees to the tangent at the discharge point. The change between the wire output angle of the wire spool 8a-22 and the wire feeding angle of the wire feeding mechanism 8a-2 is smaller, and the wire feeding is smoother.

[0216] In this embodiment, the preferred approach to ensure smooth wire feeding is to feed the welding wire from a direction where the angle between the welding wire and the tangent at the discharge point is less than 30 degrees, while keeping the length of the vehicle body as short as possible.

[0217] This embodiment provides one implementation of the wire feeding mechanism. Referring to Figures 15 to 17, the wire feeding mechanism includes:

[0218] Two pairs of wire feeding pressure rollers 8a-8 and wire feeding drive rollers 8a-9 are provided. Welding wire 8a-100 passes between each pair of wire feeding pressure rollers 8a-8 and wire feeding drive rollers 8a-9. Power is provided by the wire feeding drive rollers 8a-9. The wire feeding pressure rollers 8a-8 press the welding wire 8a-100 against the wire feeding drive rollers 8a-9, thereby using friction to pull the welding wire 8a-100 out of the welding wire spool 8a-22 and feed it to the welding gun.

[0219] The inlet tube 8a-10 and the outlet tube 8a-11 are located in front of and behind the two pairs of wire feeding pressure rollers 8a-8 and the wire feeding drive rollers 8a-9, respectively.

[0220] The wire feeding tube 8a-12 is located between the two pairs of wire feeding pressure rollers 8a-8 and the wire feeding drive rollers 8a-9.

[0221] The wire inlet tube 8a-10, wire outlet tube 8a-11, and wire feed tube 8a-12 are used to guide the welding wire 8a-100. In this embodiment, the outer walls of the wire inlet tube 8a-10 near the wire feeding pressure roller 8a-8 and the wire feeding drive roller 8a-9, and the outer walls of the wire outlet tube 8a-11 near the wire feeding pressure roller 8a-8 and the wire feeding drive roller 8a-9, are tapered, thereby getting closer to the wire feeding pressure roller 8a-8 and the wire feeding drive roller 8a-9, providing guidance for the welding wire over a longer distance without increasing the length of the wire feeding mechanism 8a-2.

[0222] When welding the inner corners of the U-ribs of the steel box girders of in-service bridges, in addition to providing an overhead welding posture for the welding torch, to minimize the impact on the rigidity and strength of the in-service bridge, the length of the working holes for the inner welding carriage to enter the U-rib should be as short as possible. Correspondingly, the length of the inner welding carriage should also be as short as possible. Therefore, in this embodiment, the outer walls of the wire inlet pipe 8a-10 near the wire feeding pressure roller 8a-8 and the wire feeding drive roller 8a-9, and the outer walls of the wire outlet pipe 8a-11 near the wire feeding pressure roller 8a-8 and the wire feeding drive roller 8a-9 are set in a tapered shape. This provides a longer guide for the welding wire 8a-100 without increasing the length of the wire feeding mechanism 8a-2, thereby reducing the length of the inner welding carriage.

[0223] In this embodiment, the wire feeding mechanism further includes:

[0224] Drive motor 8a-13;

[0225] A speed reducer, comprising a housing 8a-14 and a set of reduction gears located within the housing 8a-14;

[0226] The housing 8a-14 includes a base and a cover plate. The base is provided with a motor shaft hole, and the cover plate is provided with two output shaft holes.

[0227] The output shaft of the drive motor 8a-13 enters the housing 8a-14 through the motor shaft hole and connects to the input shaft of the reduction gear set. The input shaft of the reduction gear set is connected to the two output shafts of the reduction gear set through a multi-stage gear. The two output shafts of the reduction gear set rotate at the same speed. The output shafts of the two reduction gear sets pass through the two output shaft holes and exit the housing, and each is fixed with a wire feeding drive wheel 8a-9. The wire feeding pressure wheel is installed on the outside of the housing 8a-14.

[0228] Specifically, the output gear 8a-15 is fixed on the output shaft of the drive motor 8a-13. The output gear 8a-15 meshes with the first-stage driven gear 8a-16. The second-stage driving gear (located on the side of the first-stage driven gear 8a-16 closest to the paper in Figure 17) is coaxially fixed with the first-stage driven gear 8a-16 on the first transmission shaft 8a-17. The second-stage driven gear 8a-21 meshes with the second-stage driving gear. The third-stage driving gear (the third-stage driving gear in Figure 17...) The driving gear is located on the side of the secondary driven gear 8a-21 away from the paper surface and is coaxially fixed on the second transmission shaft 8a-18. Two tertiary driven gears 8a-20 mesh with the tertiary driving gear. The output shaft 8a-19 of the reducer, which is equipped with one of the tertiary driven gears 8a-20, passes through the output shaft hole of the cover plate and is fixed with a wire feeding drive wheel 8a-9. The wire feeding pressure wheel 8a-8 is installed on the outside of the housing 8a-14.

[0229] In this embodiment, the thickness of the reducer is greatly reduced by staggering the output gears and gears at each stage. Furthermore, the reducer housing and the base of the wire feeding mechanism share a single part (the cover plate), reducing the thickness of the wire feeding mechanism. This allows for the side-by-side placement of two wire feeding mechanisms (which weld the U-ribs and the two connecting seams of the steel plate, respectively), thereby reducing the length of the inner welding car. The shorter inner welding car is more suitable for welding the inner corners of the U-ribs of the steel box girders of in-service bridges, which will not be elaborated further.

[0230] To minimize the curvature of the welding wire 8a-100 when stored on the welding wire spool 8a-22, the diameter of the welding wire spool 8a-22 is set to be as large as possible, close to the internal height of the first vehicle body 8a-3 or the height of the U-rib. Under this design concept, in this embodiment, the reducer housing 8a-14 is mounted on a pad 8a-7, and the mounting surface of the pad 8a-7 is inclined to the bottom surface of the first vehicle body 8a-3. This allows the welding wire 8a-100 to enter the wire feeding path of the wire feeding mechanism from an angle of less than 30 degrees with the tangent at the discharge point. The pad provided in this embodiment alters the overall angle of the wire feeding mechanism, making it easy to implement and adjust.

[0231] In the scenario of welding the inner corner of the U-rib of the steel box girder of an in-service bridge, the working posture of the welding gun is obliquely upward relative to the first vehicle body 8a-3; the discharge point of the welding wire 8a-100 on the welding wire spool 8a-22 is located below the welding wire spool 8a-22, the wire feeding mechanism 8a-2 is mounted upward on the pad 8a-7, the path of the welding wire 8a-100 tends to be straight, and the wire feeding is smooth.

[0232] In this embodiment, the pad 8a-7 is made of insulating material, which meets welding standards.

[0233] As the welding wire 8a-100 is unwound from the welding wire spool 8a-22, the position of the discharge point changes. The angle of the mounting surface of the pad block 8a-7 follows the position of the discharge point, further ensuring smooth wire feeding. A photoelectric sensor can be installed on the inner wall of the welding wire spool to monitor the thickness of the welding wire wound on it. A wedge-shaped slider is installed below the higher end of the mounting surface of the pad block 8a-7. The slider is connected to the output end of a linear displacement output device (e.g., a hydraulic cylinder), transmitting the output information of the photoelectric sensor to the controller of the linear displacement output device. Changing the position of the slider changes the angle of the mounting surface of the pad block 8a-7.

[0234] In this embodiment, the U-rib inner welding car further includes:

[0235] The first upper roller 8a-5 is pressed tightly against the top plate when the first vehicle body 8a-3 moves within the U-rib. The first upper roller 8a-5 is connected to the output end of the cylinder 8a-6. The reaction force received by the first upper roller 8a-5 increases the pressure of the first vehicle body 8a-3 on the top plate of the U-rib, thereby increasing the friction and making the inner welding vehicle run more stably.

[0236] In order to enable the first vehicle body 8a-3 to move, a front drive wheel 8a-4 and a rear driven wheel are installed at the bottom of the first vehicle body 8a-3. The first top wheel 8a-5 is located directly above the front drive wheel 8a-4 of the first vehicle body 8a-3, with smaller torque and easier to achieve a pressing effect.

[0237] In this embodiment, two welding torches 8a-28 are installed on the second vehicle body 8a-27. The welding torches 8a-28 are used to weld the two seams between the U-rib and the steel plate.

[0238] The central axes of the two wire spools 8a-22 coincide.

[0239] The wire feeding pressure rollers 8a-8 of the two wire feeding mechanisms 8a-2 are coaxial, and the wire feeding drive wheel 8a-9 is coaxial.

[0240] The two welding torches 8a-28 can weld simultaneously, and the welding of the two joints between the U-rib and the steel plate can be completed in one pass of the inner welding carriage. Compared with the technical solution of the two welding wire reels 8a-22 and the two wire feeding mechanisms 8a-2 arranged in a staggered manner, the side-by-side placement of the welding wire reels 8a-22 and the wire feeding mechanism 8a-2 can reduce the length of the inner welding carriage. The shorter inner welding carriage is more suitable for the working scenario of welding the inner corner of the U-rib of the steel box girder of the in-service bridge, which will not be elaborated further.

[0241] In this embodiment, in order to make the central axes of the two wire spools 8a-22 coincide, referring to Figures 18 and 19, the two dampers 8a-24 are simultaneously fixed to the wire spool bracket 8a-23 by screws 8a-25 and nuts 8a-26. The wire feed spool 22 is installed on the damper 8a-24. The wire spool bracket 8a-23 has through holes and is assembled onto the bottom plate of the first vehicle body 8a-3 by screws.

[0242] For welding inside other narrow spaces similar to U-ribs, the U-rib welding cart provided in this embodiment can also be used.

[0243] This disclosure also proposes a U-rib repair device for in-service bridges.

[0244] Example 3

[0245] Referring to Figures 21 to 25, this embodiment provides a U-rib repair device for in-service bridges, comprising:

[0246] The second vehicle body 8b-25 is used to travel within the U-rib along the length of the U-rib;

[0247] A travel guide unit is installed on the second vehicle body 8b-25 and is used to guide the second vehicle body 8b-25.

[0248] A welding torch position adjustment unit is provided, with a welding torch 8b-1 installed at each end of the welding torch position adjustment unit. The welding torch position adjustment unit is used to adjust the position of the welding torch 8b-1 in a plane perpendicular to the length direction of the U-rib. Two welding torch position adjustment units are arranged in the left and right directions of the second vehicle body 8b-25, and each welding torch 25 points to the weld seam on the same side.

[0249] A welding torch position guide unit includes an upper guide wheel 8b-3 and a side guide wheel 8b-2. The upper guide wheel 8b-3 and the side guide wheel 8b-2 rotate freely along their respective axles. The axles of the upper guide wheel 8b-3 and the side guide wheel 8b-2 are connected to the welding torch position adjustment unit. The circumferential surface of the upper guide wheel 8b-3 presses against the upper wall of the U-rib, and the circumferential surface of the side guide wheel 8b-2 presses against the side wall of the U-rib. One welding torch position guide unit is configured for each of the two welding torch position adjustment units, and the side guide wheel on each welding torch position adjustment unit presses against the side wall on the same side as it.

[0250] In this embodiment, the inner wall shape or orientation of the U-rib is sensed by the upper guide wheel 8b-3 and the side guide wheel 8b-2, and the information on the inner wall shape or orientation of the U-rib is transmitted to the welding torch position adjustment unit through structural connection, so that the welding torch can be aligned with the weld.

[0251] Furthermore, in the U-rib repair equipment for in-service bridges provided in this embodiment, the welding torch guide units on the left and right sides adjust the position of the welding torch at the end of the welding torch position adjustment unit according to the position of the weld seam on the same side. Therefore, the welding torches on both sides can be aligned with the weld seam on the same side in real time, which can cope with the deformation of the U-rib of the in-service bridge and thus improve the welding quality.

[0252] In this embodiment, the welding torch position adjustment unit includes:

[0253] The first linear output device 8b-14 is connected to the second vehicle body 8b-25. The linear displacement output by the first linear output device 8b-14 is located in a plane perpendicular to the length direction of the U-rib.

[0254] The second linear output device 8b-18 is connected to the end of the first linear output device 8b-14. The linear displacement output by the second linear output device 8b-18 is located in a plane perpendicular to the length direction of the U-rib and is different from the linear displacement output by the first linear output device 8b-14.

[0255] By setting a first linear output device 8b-14 and a second linear output device 8b-18, the displacements output by the two devices are both in a plane perpendicular to the length direction of the U-rib but in different directions, thereby adjusting the position of the welding torch 8b-1 in the plane perpendicular to the length direction of the U-rib, thus aligning it with the weld.

[0256] In this embodiment, the second linear output device 8b-18 is located at the end of the first linear output device 8b-14. The adjustment of the second linear output device 8b-18 is not affected by the first linear output device 8b-14, and the adjustment is smoother.

[0257] In this embodiment, the axle of the upper guide wheel 8b-3 is connected to the output end of the first linear output device 8b-14 via the upper guide wheel bracket 8b-22;

[0258] The axle of the side guide wheel 8b-2 is connected to the output end of the second linear output device 8b-18 via the side guide wheel bracket 8b-21;

[0259] The position of the upper guide wheel 8b-3 directly affects the position of the output end of the first linear output device 8b-14, and the position of the side guide wheel 8b-2 directly affects the position of the output end of the second linear output device 8b-18, thereby changing the position of the welding torch. Due to the reinforcement of the old bridge U-rib, there may be deformation of the U-rib. The side guide wheel 2 can be adjusted in real time and is not affected by the upper guide wheel 3, resulting in smoother adjustment and ensuring that the welding torch 8b-1 is aligned with the weld seam on the same side in real time. The welding torch position guiding unit directly guides the welding torch section, providing greater precision.

[0260] The first linear output device 8b-14 and the second linear output device 8b-18 are pneumatic cylinders or hydraulic cylinders. The displacement change of the output end of the first linear output device 8b-14 and the second linear output device 8b-18 keeps the load on them constant, thereby achieving guidance.

[0261] In this embodiment, the cylinder of the first linear output device 8b-14 is tilted outward relative to the vertical direction;

[0262] The cylinder of the second linear output device 14 is arranged horizontally.

[0263] Specifically, a lifting base 8b-17 can be fixed to the base plate of the second vehicle body 8b-25. The upper surface of the lifting base 8b-17 has two symmetrical inclined surfaces, and the cylinders of the first linear output device 8b-14 are respectively placed and fixed on these inclined surfaces. The connecting surfaces of the two transverse bases 8b-16 and the output ends of the cylinders of the first linear output device 8b-14 are inclined, with the same inclination angle as the upper surface of the lifting base 8b-17, making the bottom surface of the transverse base 8b-16 perpendicular to the cylinder of the first linear output device 8b-14, and the upper surface of the transverse base 8b-16 horizontal. Because the cylinder of the first linear output device 8b-14 is placed at an inclination, the transverse base 8b-16 will move upwards and outwards during lifting, reducing the required stroke of the transverse slide rail 8b-15 on the transverse base. A slider is provided on the transverse slide rail 8b-15, and a drive motor 8b-4 is mounted on the slider. The output end of the drive motor 8b-4 is connected to a welding torch 8b-1.

[0264] During the repair operation, the output end of the drive motor 8b-4 drives the welding torch 8b-1 to swing within a preset angle and at a preset speed, thereby improving the welding quality.

[0265] In this embodiment, one cylinder of the second linear output device 8b-18 of the two welding torch position adjustment units is located above the transverse slide rail 8b-15, and the other is located below the transverse slide rail 8b-15, saving space. After the length of the second car body 8b-25 is shortened, the length of the opening that needs to be made on the U-rib during repair is correspondingly shortened, so as not to reduce the strength and stiffness of the bridge in service as much as possible.

[0266] In this embodiment, the cylinder bodies of the two second linear output devices 8b-18 are respectively connected to the transverse drive cylinder fixing bracket 8b-19, and the cylinder rods of the two second linear output devices 8b-18 are connected to the transverse drive cylinder telescopic shaft bracket 8b-20. The transverse drive cylinder fixing bracket 8b-19 is fixed on the transverse base 8b-16, and the transverse drive cylinder telescopic shaft bracket 8b-20 is fixed on the base on which the drive motor 8b-4 is installed. The drive motor 8b-4 and the welding torch 8b-1 can be moved laterally on the transverse slide rail 8b-15 through the second linear output devices 8b-18.

[0267] In this embodiment, the bottom of the second vehicle body 8b-25 is provided with a driven wheel 8b-13 and two pairs of driving wheels 8b-9;

[0268] The driven walking wheel 8b-13 is located between the two first linear output devices 8b-14, which increases walking stability;

[0269] The two pairs of drive wheels 8b-9 are arranged one in front of the other.

[0270] The two pairs of drive wheels 8b-9 are connected to the output shaft of the servo motor via a dual-shaft reducer. Compared to a chain drive between the motor and the wheels, the second vehicle body 8b-25 operates more stably.

[0271] In this embodiment, the walking guide unit includes two walking guide wheels 8b-12 arranged symmetrically on the left and right. The circumferential surface of the walking guide wheel 8b-12 is pressed against the side wall of the U-rib, and the axle of the walking guide wheel 8b-12 is connected to the output end of the third linear output device.

[0272] The third linear output device is a pneumatic cylinder or a hydraulic cylinder. The displacement change of the output end of the third linear output device keeps the load on it constant, thereby achieving guidance.

[0273] In this embodiment, the two walking guide wheels 8b-12 are installed below the second linear output device 8b-18, reducing the length of the second vehicle body 8b-25.

[0274] Multiple walking guide units can be set up to make the second vehicle body 8b-25 walk more smoothly, thereby improving the welding quality.

[0275] Furthermore, a travel guide wheel bracket 8b-8 is connected to the axle of each pair of drive wheels 8b-9, and the top of the travel guide wheel bracket 8b-8 is connected to the travel guide wheel 8b-5. The middle of the travel guide wheel bracket 8b-8 is hollow, and the internal space is used to place the drive motor and wiring, reducing space waste and shortening the length of the second vehicle body 8b-25. After the length of the second vehicle body 8b-25 is shortened, the length of the opening that needs to be made on the U-rib during repair is correspondingly shortened, so as not to reduce the strength and stiffness of the bridge in service as much as possible.

[0276] In this embodiment, a walking guide device with a height lower than the top of the bracket 8 is provided between the driving walking wheel 8b-9 (on the left in Figure 21) and the driven walking wheel 8b-13 located at the front.

[0277] By setting the walking guide device at different heights, the second vehicle body 8b-25 can move more smoothly, thereby improving the welding quality.

[0278] In this embodiment, the walking guide device further includes a second upper top wheel 8b-7, the circumferential surface of the second upper top wheel 8b-7 is pressed against the upper wall of the U-rib, and the axle of the second upper top wheel 8b-7 is connected to the output end of the fourth linear output device 8b-10 through a connector 8b-6;

[0279] The fourth linear output device 8b-10 is a pneumatic cylinder or a hydraulic cylinder. The displacement change of the output end of the fourth linear output device 11 keeps the load on it constant, thereby achieving guidance.

[0280] The cylinder of the fourth linear output device 8b-10 is mounted on an upper support base 8b-11 that is higher than the bottom of the vehicle body. The upper support base 8b-11 is designed with a hollow structure in the middle. Increasing the height of the cylinder of the fourth linear output device 8b-10 can reduce the cylinder stroke. At the same time, the internal space can accommodate the drive motor and wiring, reducing space waste and shortening the length of the second vehicle body 8b-25. After the length of the second vehicle body 8b-25 is shortened, the length of the opening required on the U-rib during repair is correspondingly shortened, thereby minimizing the reduction in the strength and stiffness of the bridge in service.

[0281] In this embodiment, a mounting plate is provided behind the welding torch position adjustment unit. A camera 8b-23 and a lighting lamp 8b-24 are mounted on the mounting plate. The field of view of the camera 8b-23 and the lighting lamp 8b-24 includes the nozzle of the welding torch 8b-1. The lighting lamp 8b-24 and the camera 8b-23 are fixedly placed so that the welding position can be observed at all times, facilitating the monitoring of welding quality.

[0282] In this embodiment, the U-rib repair equipment for in-service bridges also includes a first vehicle body. The first vehicle body travels in the opposite direction along the length of the U-rib within the U-rib. The first vehicle body is equipped with a welding wire spool and a wire feeding structure, and is located behind the second vehicle body. The welding wire spool can rotate freely around its central axis, and the welding wire is wound on the spool. The wire feeding structure includes a wire feeding pressure roller and a wire feeding drive roller, used to feed the welding wire wound on the spool to the welding gun. The point where the welding wire leaves the spool is the discharge point of the spool. The welding wire enters between the wire feeding pressure roller and the wire feeding drive roller from a direction with an angle of less than 30 degrees to the tangent at the discharge point.

[0283] In this embodiment, the U-rib repair equipment for in-service bridges includes a first vehicle body equipped with a welding wire reel and a wire feeding structure. The welding wire enters between the wire feeding pressure wheel and the wire feeding drive wheel from a direction with an angle of less than 30 degrees to the tangent at the discharge point. The change between the welding wire output angle of the welding wire reel and the wire feeding angle of the wire feeding mechanism is reduced, and the wire feeding is smoother.

[0284] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

[0285] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "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 invention 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 invention.

[0286] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0287] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0288] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, 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.

[0289] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for repairing an in-service steel box girder, wherein the U-rib has a construction window for repairing the steel box girder, characterized in that, The method includes the following steps: S1. Cut the sealing plate of the U-rib along the extension direction of the U-rib on both sides of the construction window; S2. The repair equipment travels along the extension direction of the U-rib and passes through the notch formed in S1 to perform repair work on the area of ​​the U-rib to be repaired.

2. The repair method for in-service steel box girders according to claim 1, characterized in that, S1 includes the following steps: S1-1. A cutting device for cutting the sealing plate that needs to be opened in the U-rib is placed on a lifting platform, which is located on the ground below the construction window. S1-2. Raise the lifting platform to a height that allows the cutting equipment to smoothly enter the interior of the U-rib; S1-3. Start the cutting device so that the cutting device cuts the sealing plate to be opened inside the U-rib along the extension direction of the U-rib.

3. The repair method for in-service steel box girders according to claim 2, characterized in that, In S1-3, when there are multiple open sealing plates, all the cut sealing plates have the same shape and size.

4. The repair method for in-service steel box girders according to claim 2, characterized in that, In S1-3, when there are multiple sealing plates that need to be opened along one extension direction of the U-rib, the cutting-off sealing plates decrease sequentially according to a set inward reduction dimension a, and the height Hn of the sealing plate n and its order n closest to the construction window satisfy the following formula: Hn = H1 - a × (n-1) Wherein, sealing plate n is the nth sealing plate that needs to be opened along the extension direction of the U-rib on both sides of the construction window, and n is a positive integer; a is the inward dimension; H1 is the height of the first sealing plate portion that is cut off; Hn is the height of the nth sealing plate portion that is cut off; Hn is not less than the minimum height that the cutting equipment, magnetic suction equipment, and welding equipment can pass through.

5. The method for repairing in-service steel box girders according to claim 2, characterized in that, In step S1-4-1, the magnetic suction device used to remove the sealing plate cut off in step S1-3 is placed on the lifting platform, which is located on the ground below the construction window. S1 also includes: S1-4. Place the cut-off cover plate from S1-3 in the designated position.

6. The repair method for in-service steel box girders according to claim 5, characterized in that, S1-4 includes the following steps: S1-4-1. Place the magnetic suction device for removing the sealing plate cut off in S1-3 on the lifting platform, which is located on the ground below the construction window; S1-4-2. Raise the lifting platform to a height that allows the magnetic suction device to smoothly enter the interior of the U-rib; S1-4-3. Activate the magnetic attraction device so that the magnetic attraction device magnetically attracts the sealing plate cut off in S1-3 along the extension direction of the U-rib inside the U-rib. By extending, rotating or other operations of the electromagnet device of the magnetic attraction device, the cut-off sealing plate is placed from the cut to the designated position.

7. The method for repairing in-service steel box girders according to claim 1, characterized in that, When there are multiple sealing plates that need to be opened, repeat S1 until all the sealing plates that need to be opened are cut.

8. The method for repairing in-service steel box girders according to claim 1, characterized in that, It also includes the following steps: S3. Reinstall the sealing plate that was cut off in S1; S4. Reseal the sealing plate that was reinstalled in S3.

9. The method for repairing in-service steel box girders according to claim 8, characterized in that, S4 includes: S4-1. Place the welding equipment used for welding and sealing the sealing plate that was put back into place in step S3 on the lifting platform. The lifting platform is set on the ground below the construction window. S4-2. Raise the lifting platform to a height that allows the welding equipment to smoothly enter the U-rib; S4-3. Start welding, so that the welding equipment is sent inside the U-rib along the extension direction of the U-rib to the sealing plate that was put back in place in step S3, and the sealing plate is welded and sealed. S4-4. After the welding seal is completed, move the welding equipment back to the lifting platform and lower the lifting platform to the initial height to remove the welding equipment.

10. The method for repairing in-service steel box girders according to claim 1, characterized in that, Step S2 includes: Place the welding equipment on the lifting platform and raise the platform to a height that allows the welding equipment to smoothly enter the interior of the U-rib. Start the welding equipment and move it along the extension direction of the U-rib to be repaired to the starting point. Then start the welding program, so that during the return process, the welding equipment welds the inner corner of the U-rib and the area to be repaired along the extension direction of the U-rib. After welding is completed, move the welding equipment back onto the lifting platform and lower the platform to the initial height to remove the welding equipment.

11. The method for repairing in-service steel box girders according to any one of claims 1-9, characterized in that, The construction windows are located at the connection points of two adjacent U-ribs.

12. The method for repairing in-service steel box girders according to claim 11, characterized in that, A sealing plate is provided inside the U-rib, and the construction window is opened on the U-rib near the sealing plate.

13. The method for repairing in-service steel box girders according to claim 1, characterized in that, Methods for opening construction windows include: Cut a section of any U-rib in the middle of the steel box girder to form two sections, creating an opening at the cut point, which serves as the construction window.

14. A repair system for in-service steel box girders, comprising repair equipment, characterized in that, The repair system is used to implement the repair method for in-service steel box girders according to any one of claims 1-13, and the repair system further includes: The cutting equipment cuts the sealing plate of the U-rib along the extension direction of the U-rib on both sides of the construction window.

15. The repair system for in-service steel box girders according to claim 14, characterized in that, The repair system also includes: A magnetic attraction device is used to magnetically attract the cut-off sealing plate inside the U-rib along the extension direction of the U-rib. By extending, rotating, or performing other operations on the electromagnet device of the magnetic attraction device, the cut-off sealing plate can be placed in a designated position.

16. The in-service steel box girder repair system according to claim 14 or 15, characterized in that, The repair system also includes: A lifting platform is set on the ground below the construction window, and the cutting equipment and / or the magnetic suction device are placed on the lifting platform; Raise the lifting platform to a height that allows the cutting device and / or the magnetic suction device to smoothly enter the interior of the U-rib.

17. The repair system for in-service steel box girders according to claim 14 or 15, characterized in that, The repair system also includes: The device includes a wire hole and a plug-in module. The wire hole is located at the bottom or side wall of the U-rib where the sealing plate to be opened is located. The plug-in module forms the power receiving end of the cutting device and / or the magnetic attraction device. The output end of the power supply system is plugged into the plug-in module through the wire hole to supply power to the cutting device and / or the magnetic attraction device.

18. The repair system for in-service steel box girders according to claim 14, characterized in that, The repair system also includes: The reloading equipment and sealing equipment are used to reload the cut-off sealing plate back into the notch where it was cut. The sealing device restores the seal by reinstalling the cut-off sealing plate from the reinstallation device.

19. A U-rib internal welding machine, used for welding steel box girders, characterized in that, Include: The first vehicle body travels within the U-rib along the length of the U-rib, and a wire spool and a wire feeding mechanism are provided on the first vehicle body. The second vehicle body is located in front of the first vehicle body, and the welding torch is mounted on the second vehicle body; in, The welding wire spool can rotate freely around its central axis, and the welding wire is wound on the welding wire spool; The wire feeding mechanism includes a wire feeding pressure roller and a wire feeding drive roller, which are used to feed the welding wire wound on the welding wire spool to the welding gun. The point where the welding wire leaves the welding wire spool is the discharge point of the welding wire spool. The welding wire enters between the wire feeding pressure roller and the wire feeding drive roller from a direction with an angle of less than 30 degrees with the tangent at the discharge point.

20. The U-rib internal welding machine according to claim 19, characterized in that, The wire feeding mechanism includes: two pairs of wire feeding pressure rollers and the wire feeding drive roller; The inlet tube and outlet tube are located in front of and behind the two pairs of wire feeding pressure rollers and the wire feeding drive rollers; The wire feeding tube is located between the two pairs of wire feeding pressure rollers and the wire feeding drive rollers.

21. The U-rib internal welding machine according to claim 20, characterized in that, The wire feeding structure further includes: Drive motor; A speed reducer, comprising a housing and a set of reduction gears located within the housing; The housing includes a base and a cover plate. The base is provided with a motor shaft hole, and the cover plate is provided with two output shaft holes. The output shaft of the drive motor enters the housing through the motor shaft hole and connects to the input shaft of the reduction gear set. The input shaft of the reduction gear set is connected to the two output shafts of the reduction gear set through a multi-stage gear. The two output shafts of the reduction gear set rotate at the same speed. After the two output shafts of the reduction gear set pass through the two output shaft holes and exit the housing, one of the wire feeding drive wheels is fixed in place. The wire feeding roller is installed on the outside of the machine housing.

22. The U-rib internal welding machine according to claim 21, characterized in that, The housing of the reducer is mounted on a pad, and the mounting surface of the pad on which the housing is mounted is inclined to the ground of the first vehicle body.

23. The U-rib internal welding machine according to claim 22, characterized in that, The discharge point of the welding wire on the welding wire spool is located below the welding wire spool, and the wire feeding mechanism is mounted upward on the pad.

24. The U-rib internal welding machine according to claim 22, characterized in that, The pad is made of insulating material.

25. The U-rib internal welding machine according to claim 22, characterized in that, The angle of the mounting surface of the pad changes with the position of the discharge point.

26. The U-rib internal welding machine according to claim 19, characterized in that, Also includes: The first upper top wheel is pressed tightly against the top plate when the vehicle body moves within the U-rib. The first upper top wheel is connected to the output end of a cylinder or hydraulic cylinder.

27. The U-rib internal welding machine according to claim 26, characterized in that, The bottom of the vehicle body is equipped with a drive wheel and a driven wheel, and the first top wheel is located directly above the drive wheel.

28. The U-rib internal welding machine according to claim 19, characterized in that, Two welding torches are installed on the second vehicle body, and the welding torches are used to weld the two gaps between the U-rib and the steel plate respectively; The central axes of the two welding wire spools coincide; The wire feeding pressure rollers of the two wire feeding mechanisms are coaxial, and the wire feeding drive wheel is coaxial.

29. A U-rib repair device for in-service bridges, characterized in that, Include: The second vehicle body is used to travel within the U-rib along the length of the U-rib; A travel guidance unit, installed on the second vehicle body, is used to guide the second vehicle body; A welding torch position adjustment unit is provided, with a welding torch mounted at each end. The welding torch position adjustment unit is used to adjust the position of the welding torch in a plane perpendicular to the length direction of the U-rib. Two welding torch position adjustment units are arranged in the left-right direction of the second vehicle body, with each welding torch pointing towards the weld seam on the same side. A welding torch position guide unit includes an upper guide wheel and a side guide wheel, which rotate freely along their respective axles. The axles of the upper guide wheel and the side guide wheel are connected to the welding torch position adjustment unit. The circumferential surface of the upper guide wheel presses against the upper wall of the U-rib, and the circumferential surface of the side guide wheel presses against the side wall of the U-rib. One welding torch position guide unit is provided for each of the two welding torch position adjustment units, with the side guide wheel of each welding torch position adjustment unit pressing against the side wall on the same side.

30. The U-rib repair equipment for in-service bridges according to claim 29, characterized in that, The welding torch position adjustment unit includes: A first linear output device is connected to the second vehicle body, and the linear displacement output by the first linear output device is located in a plane perpendicular to the length direction of the U-rib. A second linear output device is connected to the end of the first linear output device. The linear displacement output by the second linear output device is located in a plane perpendicular to the length direction of the U-rib and is different from the linear displacement output by the first linear output device.

31. The U-rib repair equipment for in-service bridges according to claim 30, characterized in that, The axle of the upper guide wheel is connected to the output end of the first linear output device; The axle of the side guide wheel is connected to the output end of the second linear output device; The first linear output device and the second linear output device are pneumatic cylinders or hydraulic cylinders, and the displacement change of the output end of the first linear output device and the second linear output device makes the load they are subjected to constant.

32. The U-rib repair equipment for in-service bridges according to claim 31, characterized in that, The cylinder of the first linear output device is tilted outward relative to the vertical direction; The cylinder of the second linear output device is arranged horizontally.

33. The U-rib repair equipment for in-service bridges according to claim 32, characterized in that, The output end of the first linear output device is connected to the transverse base. The bottom surface of the transverse base is perpendicular to the cylinder of the first linear output device, and the top surface of the transverse base is horizontal. A transverse slide rail is provided on the transverse base, and a slider is provided on the transverse slide rail. A drive motor is installed on the slider, and the output end of the drive motor is connected to the welding torch.

34. The U-rib repair equipment for in-service bridges according to claim 33, characterized in that, One of the cylinders of the second linear output device of the two welding torch position adjustment units is located above the transverse slide rail, and the other is located below the transverse slide rail.

35. The U-rib repair equipment for in-service bridges according to claim 30, characterized in that, The bottom of the second vehicle body is equipped with driven wheels and two pairs of driving wheels; The driven walking wheel is located between the two first linear output devices; The two pairs of drive wheels are arranged one in front of the other.

36. The U-rib repair equipment for in-service bridges according to claim 35, characterized in that, The walking guide unit includes two walking guide wheels arranged symmetrically on the left and right. The circumferential surface of the walking guide wheel is pressed against the side wall of the U-rib, and the wheel axle of the walking guide wheel is connected to the output end of the third linear output device. The third linear output device is a pneumatic cylinder or a hydraulic cylinder, and the displacement change of the output end of the third linear output device keeps the load it receives constant.

37. The U-rib repair equipment for in-service bridges according to claim 36, characterized in that, Each pair of driving axles is connected to a driving guide wheel bracket, and the top of the bracket is connected to the driving guide wheel.

38. The U-rib repair equipment for in-service bridges according to claim 36, characterized in that, The walking guide device also includes a second upper top wheel, the circumferential surface of which is pressed against the upper wall of the U-rib, and the axle of the second upper top wheel is connected to the output end of the fourth linear output device; The fourth linear output device is a pneumatic cylinder or a hydraulic cylinder, and the displacement change of the output end of the fourth linear output device keeps the load it receives constant. The cylinder of the fourth linear output device is mounted on the upper top device base, which is higher than the bottom of the second vehicle body.

39. The U-rib repair equipment for in-service bridges according to claim 29, characterized in that, A mounting plate is provided behind the welding torch position adjustment unit, and a camera and a lighting lamp are provided on the mounting plate. The field of view of the camera and the lighting lamp includes the nozzle of the welding torch.

40. The U-rib repair equipment for in-service bridges according to any one of claims 29-39, characterized in that, The U-rib repair equipment for the in-service bridge also includes: The first vehicle body travels within the U-rib along the length of the U-rib. The first vehicle body is equipped with a welding wire spool and a wire feeding mechanism. The first vehicle body is located behind the second vehicle body. in, The welding wire spool can rotate freely around its central axis, and the welding wire is wound on the welding wire spool; The wire feeding mechanism includes a wire feeding pressure roller and a wire feeding drive roller, which are used to feed the welding wire wound on the welding wire spool to the welding gun. The point where the welding wire leaves the welding wire spool is the discharge point of the welding wire spool. The welding wire enters between the wire feeding pressure roller and the wire feeding drive roller from a direction with an angle of less than 30 degrees with the tangent at the discharge point.

Images