Method for butt joining of a bridge crane girder

Abstract

The application discloses a butt joint method for a main beam of a bridge crane, and relates to the technical field of bridge crane manufacturing, in particular to a butt joint device for a main beam of a bridge crane, which comprises a hydraulic turnover mechanism, a hydraulic system, a turnover connecting frame, a steel plate lifting device and a T-shaped steel and web butt joint device. The hydraulic turnover mechanism is arranged by a plurality of turnover units. The hydraulic system controls the turnover of each turnover unit on the turnover mechanism. The turnover connecting frame is connected to one side of the turnover unit and has a length adjustable. The steel plate lifting device is arranged between the turnover units and corresponds to the turnover connecting frame. The T-shaped steel and web butt joint device is arranged in the middle of the turnover unit and is controlled by the hydraulic system. The application realizes the butt joint of the main beam web plate and cover plate, the turnover of the steel plate, the cutting and arching of the web plate, and the butt joint of the T-shaped steel and web plate in the same device. Meanwhile, the T-shaped steel is automatically bent and deformed from the middle to the two ends, which saves manpower and material resources, improves the main beam welding precision and efficiency, and effectively shortens the main beam manufacturing period.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of girder butt joint, and particularly relates to a bridge crane girder butt joint method. BACKGROUND

[0002] The bridge girder is a key load-bearing component of the bridge crane, and has the characteristics of long size, large cross-sectional area, complex structure and large welding amount. The common T-shaped steel rail-bearing box-shaped girder is mainly composed of a rail, an upper cover plate, a lower cover plate, a main web plate, an auxiliary web plate, a large rib plate and a T-shaped steel.

[0003] Since the web plate and the cover plate of the bridge crane girder are long (generally 20-30 meters) and soft, a plurality of steel plates are needed to butt joint to form the web plate or the cover plate. In the prior art, the bridge girder is formed by butt joint of steel plates to form the web plate or the cover plate, and the T-shaped steel and the web plate are butt joint to form the girder, and a crane and a special tool are used for lifting. After lifting, the steel plate has a large turning range, and a plurality of people are needed to cooperate, and the overall butt joint process has a low degree of automation, thereby causing a large investment in manpower and resources, and seriously affecting the manufacturing cycle of the girder. SUMMARY

[0004] To at least partially solve the technical problems existing in the prior art, the present application provides a bridge crane girder butt joint method.

[0005] The technical scheme of the present application is as follows:

[0006] In a first aspect, the present application provides a bridge crane girder butt joint device comprising a hydraulic turnover mechanism, a hydraulic system, a turnover connecting frame, a steel plate lifting device and a T-shaped steel and web plate butt joint device, wherein: the hydraulic turnover mechanism is arranged by a plurality of turnover units, the hydraulic system controls the turnover of each turnover unit on the turnover mechanism, the turnover connecting frame is adjustably connected to one side of the turnover unit, the steel plate lifting device is arranged between the turnover units and corresponds to the turnover connecting frame, and the T-shaped steel and web plate butt joint device is arranged in the middle of the turnover unit and is controlled by the hydraulic system.

[0007] The turnover unit comprises two support chassis and two turnover frames, and the two turnover frames are symmetrically arranged on the two support chassis.

[0008] Further, in the bridge crane girder butt joint device, the steel plate lifting device comprises a lifting chassis, sliding guides, a lifting platform, a scissor support and a scissor rotating shaft, the sliding guides are arranged on the same side of the lifting chassis and the lifting platform respectively, one side of the bottom of the scissor support is slidably connected with the lifting chassis through the sliding guides, the other side of the bottom of the scissor support is rotatably connected with the lifting chassis, the middle part of the scissor support is rotatably connected through the scissor rotating shaft, one side of the top of the scissor support is slidably connected with the lifting platform through the sliding guides, and the other side of the top of the scissor support is rotatably connected with the lifting platform, and the scissor support is used to realize platform lifting.

[0009] Further, in the bridge crane girder butt joint device, the two ends of the turnover connecting frame are fixedly connected with the turnover units through bolts respectively.

[0010] Further, in the bridge crane girder butt joint device, the T-shaped steel and web butt joint device comprises a right-angle head, a sliding table and a hydraulic oil cylinder, the sliding table is arranged in the middle part of one of the support chassis, the right-angle head is slidably arranged on the sliding table, the hydraulic oil cylinder is installed on the support chassis and connected with the hydraulic system, and the output end of the hydraulic oil cylinder is connected with the right-angle head.

[0011] Further, in the bridge crane girder butt joint device, the steel plate lifting device further comprises a track frame, the lifting chassis is slidably arranged on the track frame, and the track frame is used to realize position adjustment of the steel plate lifting device.

[0012] Further, in the bridge crane girder butt joint device, the hydraulic turnover mechanism further comprises an electrical control system, and the electrical control system is used to control the hydraulic system to operate the turnover frame to implement turnover and the T-shaped steel and web butt joint device to implement butt joint.

[0013] In a second aspect, the present application further provides a bridge crane girder butt joint method, comprising:

[0014] S1: placing the girder cover plate and web butt joint steel plate on the turnover frame provided with the T-shaped steel and web butt joint device through the electromagnetic lifting tool, assisting in adjusting the position of the butt joint steel plate through the T-shaped steel and web butt joint device of the bridge crane girder butt joint device, ensuring that the width direction misalignment of the butt joint steel plate is less than 1 mm, and adopting submerged arc welding for welding;

[0015] S2: start the hydraulic system, and operate the electrical control system to control the hydraulic system to make the turnover frame drive the main beam cover plate, the web plate butt joint steel plate start to overturn, after the overturning action is completed, the hydraulic system is controlled through the electrical control system to reset the turnover frame, at this time, the worker cleans the main beam cover plate, the web plate butt joint steel plate weld, and carries out second time submerged arc welding;

[0016] S3: the worker of the welding gap hoists the other cover plate, the web plate butt joint steel plate and carries out submerged arc welding;

[0017] S4: after the main beam cover plate, the web plate butt joint steel plate butt joint welding is completed, the main beam cover plate, the web plate butt joint steel plate is separated from the turnover frame through the control steel plate lifting device, when the main beam cover plate, the web plate butt joint steel plate is lifted to a certain height, the web plate butt joint steel plate is cut through the professional bevel cutting equipment, the main beam cover plate, the web plate butt joint steel plate is lowered and falls on the turnover frame through the control steel plate lifting device;

[0018] S5: the T-shaped steel is hoisted to the right angle head of the T-shaped steel and the web plate butt joint device, and the T-shaped steel is aligned to the web plate height;

[0019] S6: the maximum deformation of the T-shaped steel and the action deformation of the T-shaped steel and the web plate butt joint device at each place are calculated, the corresponding coefficients are input into the hydraulic system, the right angle head is moved along the sliding table through the automatic control of the hydraulic cylinder, wherein the action sequence of the T-shaped steel and the web plate butt joint device on the turnover unit is from the middle to the two sides in turn, the T-shaped steel and the web plate camber gradually coincide in the movement interval, and the worker carries out spot welding,

[0020] S7: the T-shaped steel and the web plate are spot welded, submerged arc welding is carried out, after the welding is completed, the T-shaped steel and the web plate are turned over through the hydraulic turnover mechanism, and the other side is welded, so that the T-shaped steel and the web plate butt joint of the bridge crane main beam are completed.

[0021] Further, in the bridge crane main beam T-shaped steel and web plate butt joint method, in S6, the maximum deformation Δf of the T-shaped steel can be obtained according to the formula: when the bridge crane span L = 15-30 m, Δf = (0.25-0.45) L, when the bridge crane span L = 30-40 m, Δf = (0.5-0.8) L, and the specific coefficient can be selected according to the deformation coefficient when the web plate camber is actually cut; according to the above formula, the maximum deformation of the T-shaped steel can be calculated by inputting the corresponding coefficient in the system, and the action deformation of the T-shaped steel and the web plate butt joint device at each place can be calculated according to the maximum deformation.

[0022] The bridge crane main beam butt joint device and the butt joint method have the following advantages and beneficial effects:

[0023] The bridge crane main beam butt joint device has simple structure and is convenient to operate, the bridge crane main beam butt joint method implemented by the bridge crane main beam butt joint device is convenient to operate and can realize automatic butt joint, the turning force is provided by the hydraulic turning mechanism, the main beam is turned during welding, the butt joint efficiency is improved, the butt joint precision is effectively improved by cooperation of the T-shaped steel and the web butt joint device, and the main beam manufacturing period is effectively shortened. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only used to further understand the present application and form a part of the present application. Other drawings can also be obtained by those skilled in the art without creative effort based on these drawings. In the drawings:

[0025] Figure 1 It is a three-dimensional structure schematic view of the bridge crane main beam butt joint device of the present application;

[0026] Figure 2 It is a front view of the bridge crane main beam butt joint device of the present application;

[0027] Figure 3 It is a left view of the bridge crane main beam butt joint device of the present application;

[0028] Figure 4 It is a top view of the bridge crane main beam butt joint device of the present application;

[0029] Figure 5 It is Figure 2 A sectional view of A-A in FIG. 1, showing the structure of the steel plate lifting device of the bridge crane main beam butt joint device;

[0030] Figure 6 It is Figure 2 A sectional view of B-B in FIG. 1, showing the structure of the hydraulic turning mechanism of the bridge crane main beam butt joint device.

[0031] Explanation of reference signs:

[0032] 10: Hydraulic turning mechanism

[0033] 1: Turning unit, 11: Support base frame;

[0034] 12: Turning frame, 121: Turning shaft, 122: Turning table, 123: Connecting device, 124: Turning hook;

[0035] 2: Turning connecting frame;

[0036] 3: Steel plate lifting device; 31: Lifting base frame; 32: Sliding guide rail; 33: Lifting platform; 34: Scissor lift bracket; 35: Scissor lift shaft; 36: Track frame;

[0037] 4: T-shaped steel and web plate docking device; 41: Right angle head; 42: Slide table; 43: Hydraulic cylinder. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0039] Example 1:

[0040] like Figures 1 to 6 As shown, the present invention provides a main beam docking device for a bridge crane, including a hydraulic tilting mechanism 10, a hydraulic system, a tilting connecting frame 2, a steel plate lifting device 3, and a T-shaped steel and web plate docking device 4. The hydraulic tilting mechanism 10 is composed of multiple tilting units 1 arranged in a row. The hydraulic system controls the tilting of each tilting unit 1 on the tilting mechanism 10. The tilting connecting frame 2 is connected to one side of the tilting unit 1 with adjustable length. The steel plate lifting device 3 is arranged between the tilting units 1 and corresponds to the tilting connecting frame 2. The T-shaped steel and web plate docking device 4 is arranged in the middle of the tilting unit 1 and is controlled by the hydraulic system.

[0041] The flipping unit 1 includes two support base frames 11 and two flipping frames 12, which are rotatably and symmetrically arranged on the two support base frames 11.

[0042] The turnover frame 12 is composed of a turnover shaft 121, a turnover table 122 and a connecting device 123, the turnover table 122 is connected with the support by the turnover shaft 121, the turnover shaft 121 is connected with the hydraulic system through the connecting device 123, the upper end of the turnover table 122 is provided with a turnover hook 124 at the connecting end of the turnover shaft 121, the turnover hook 124 can avoid the sliding of the workpiece when the turnover frame 12 turns over the workpiece, the turnover table 122 is used for carrying the workpiece of the turnover main beam, the turnover tables 122 on the two turnover frames 12 are cooperated to turn over 180 degrees for the workpiece, the turnover table 122 on each turnover frame can be turned over by 95 degrees at most when independently turning over, the hydraulic system provides power for the turnover frame 12, and the automatic control turnover can be realized by cooperating with the visual system to monitor the turnover frame 12, so that the placement, butt joint and butt joint welding of the steel plate of the cover plate and raft plate splicing are realized, the steel plate is turned over by 180 degrees, the web plate and the T-shaped steel are turned over by 180 degrees after the web plate and the T-shaped steel are welded on one side, and a large amount of manpower is effectively saved.

[0043] Further, in the bridge crane main beam butt joint device, the steel plate lifting device 3 comprises a lifting chassis 31, sliding guides 32, a lifting platform 33, a scissor support 34 and a scissor rotating shaft 35, the sliding guides 32 are arranged on the same side of the lifting chassis 31 and the lifting platform 33 respectively, one side of the bottom of the scissor support 34 is slidably connected with the lifting chassis 31 through the sliding guides 32, the other side of the bottom of the scissor support 34 is rotatably connected with the lifting chassis 31, the middle part of the scissor support 34 is rotatably connected through the scissor rotating shaft 35, one side of the top of the scissor support 34 is slidably connected with the lifting platform 33 through the sliding guides 32, the other side of the top of the scissor support 34 is rotatably connected with the lifting platform 33, and the scissor support 34 is used for realizing the lifting of the platform, through the steel plate lifting device 3, the steel plate is lifted to a certain height when cutting the arch on the web plate, so that the damage of the flame to the steel plate turnover frame 12 is effectively avoided.

[0044] Further, in the bridge crane main beam butt joint device, the turnover connecting frame 2 is fixedly connected with the turnover frame 12 on one side through bolts between the turnover units 1 corresponding to the steel plate lifting device 3 at both ends, the distance between the turnover units 1 is adjusted by adjusting the length of the turnover connecting frame 2, and the number of the turnover units is increased or reduced according to the length of the main beam, so that the device is suitable for the butt joint of main beams with various lengths.

[0045] Further, in the bridge crane girder butt joint device, the T-shaped steel and web butt joint device 4 comprises a right angle head 41, a sliding table 42 and a hydraulic cylinder 43, the sliding table 42 is arranged in the middle of one of the support chassis 11, the right angle head 41 is slidingly arranged on the sliding table 42, the hydraulic cylinder 43 is connected with the hydraulic system and arranged on the support chassis 11, and the output end of the hydraulic cylinder 43 is connected with the right angle head 41, so that the forced bending deformation of the T-shaped steel or the width adjustment of the steel plate during butt joint is realized by the hydraulic system, thereby effectively improving the precision during butt joint.

[0046] Further, in the bridge crane girder butt joint device, the steel plate lifting device 3 further comprises a track frame 36, and the lifting chassis 31 is slidingly arranged on the track frame 36, so that the position adjustment of the steel plate lifting device 3 is realized, thereby realizing the manual or automatic adjustment of the front and back movement of the lifting device and the position adjustment of the steel plate lifting device 3 according to the size of the steel plate.

[0047] Further, in the bridge crane girder butt joint device, the hydraulic turnover mechanism 1 further comprises an electrical control system, which is used to control the hydraulic system to operate the turnover frame 12 to implement turnover and the T-shaped steel and web butt joint device 4 to implement butt joint.

[0048] In the second aspect, the application further provides a bridge crane girder butt joint method, which comprises the following steps:

[0049] S1: placing the girder cover plate and web butt joint steel plate on the turnover frame 12 with the T-shaped steel and web butt joint device 4 through the electromagnetic lifting tool, and adjusting the position of the butt joint steel plate through the T-shaped steel and web butt joint device 4 of the bridge crane girder butt joint device, so as to ensure that the width direction of the butt joint steel plate is less than 1mm, and then adopting submerged arc welding to perform welding;

[0050] S2: starting the hydraulic system, and operating the electrical control system to control the hydraulic system to drive the turnover frame 12 to start turnover of the girder cover plate and web butt joint steel plate, and after the turnover operation is completed, the electrical control system is used to control the hydraulic system to reset the turnover frame 12, at this time, the workers clean the weld of the girder cover plate and web butt joint steel plate and perform the second submerged arc welding;

[0051] S3: workers perform butt joint and submerged arc welding of other girder cover plates and web butt joint steel plates;

[0052] S4: after the butt welding of the girder cover plate and the web plate is completed, the steel plate lifting device is controlled to separate the girder cover plate and the web plate from the turnover frame, and when the girder cover plate and the web plate are lifted to a certain height, the web plate upper arch is cut by a professional bevel cutting equipment, and after the web plate upper arch is cut, the steel plate lifting device is controlled to lower the girder cover plate and the web plate to the turnover frame;

[0053] S5: the T-shaped steel is hung at the right angle head 41 of the T-shaped steel and web plate butt joint device 4, and the T-shaped steel is aligned with the web plate height;

[0054] S6: the maximum deformation of the T-shaped steel and the deformation of the T-shaped steel and web plate butt joint device 4 at each position are calculated, the corresponding coefficients are input into the hydraulic system, the hydraulic cylinder is automatically controlled to move the right angle head along the sliding table 42, wherein the action sequence of the T-shaped steel and web plate butt joint device 4 on the turnover unit 1 is to move from the middle to the two sides in turn, the T-shaped steel and web plate upper arch gradually coincide in the movement interval, and the workers perform spot welding,

[0055] S7: after the spot welding of the T-shaped steel and the web plate is completed, the submerged arc welding is performed, and after the welding is completed, the hydraulic turnover mechanism 10 is used to turn over the T-shaped steel and the web plate, and the other side is welded, so that the T-shaped steel and the web plate butt joint of the bridge crane girder is completed.

[0056] Further, in the bridge crane girder T-shaped steel and web plate butt joint method, in S6, the maximum deformation of the T-shaped steel Δf can be obtained according to the formula: when the bridge crane span L = 15-30 m, Δf = (0.25-0.45) L, when the bridge crane span L = 30-40 m, Δf = (0.5-0.8) L, and the specific coefficient can be selected according to the deformation coefficient when the web plate upper arch is actually cut; according to the above formula, by inputting the corresponding coefficient in the system, the maximum deformation of the T-shaped steel can be calculated, and the deformation of the T-shaped steel and web plate butt joint device at each position can be calculated according to the maximum deformation

[0057] Compared with the prior art, the bridge crane girder butt joint device and the butt joint method have the following advantages and beneficial effects: the bridge crane girder butt joint device is simple in structure and convenient to operate, the bridge crane girder butt joint method implemented by using the bridge crane girder butt joint device is convenient to operate and can realize automatic butt joint, the turnover force is provided by the hydraulic turnover mechanism, the girder is turned over during welding, the butt joint efficiency is improved, the butt joint precision is effectively improved by the cooperation of the T-shaped steel and web plate butt joint device, and the girder manufacturing cycle is effectively shortened.

[0058] It should be noted that, in this article, unless otherwise specified and limited, the term "connection" or its synonyms should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements or interaction relationship of two elements, and those skilled in the art can understand the specific meaning of the above-mentioned term in the present application according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. At the same time, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or equipment. In addition, "front", "back", "left", "right", "up", "down" in this article are referred to the placement state shown in the drawings.

[0059] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of butt joining bridge crane girders, characterised in that, The method utilizes the bridge crane girder butt joint device, which comprises a hydraulic turnover mechanism, a hydraulic system, a turnover connecting frame, a steel plate lifting device and a T-shaped steel and web butt joint device, wherein the hydraulic turnover mechanism is arranged by a plurality of turnover units, the hydraulic system controls the turnover of each turnover unit on the turnover mechanism, the turnover connecting frame is adjustably connected to one side of the turnover unit, the steel plate lifting device is arranged between the turnover units and corresponds to the turnover connecting frame, and the T-shaped steel and web butt joint device is arranged in the middle of the turnover unit and is controlled by the hydraulic system; The turnover unit comprises two supporting chassis and two turnover frames, and the two turnover frames are symmetrically arranged on the two supporting chassis and can rotate; The T-shaped steel and web butt joint device comprises a right-angle head, a sliding table and a hydraulic oil cylinder, the sliding table is arranged in the middle of one of the supporting chassis, the right-angle head is slidably arranged on the sliding table, the hydraulic oil cylinder is mounted on the supporting chassis and connected with the hydraulic system, and the output end of the hydraulic oil cylinder is connected with the right-angle head; The hydraulic turnover mechanism further comprises an electrical control system, which is used for controlling the operation of the hydraulic system and the turnover frame to implement turnover and the operation of the T-shaped steel and web butt joint device to implement butt joint; The bridge crane girder butt joint method comprises the following steps: S1: placing the girder cover plate and web butt joint steel plate on the turnover frame with the T-shaped steel and web butt joint device by the electromagnetic lifting tool, and adjusting the position of the web butt joint steel plate by the T-shaped steel and web butt joint device of the bridge crane girder butt joint device to ensure that the width direction misalignment of the web butt joint steel plate is less than 1 mm, and then adopting submerged arc welding for welding; S2: starting the hydraulic system, and operating the electrical control system to control the hydraulic system to drive the turnover frame to start turning over the girder cover plate and web butt joint steel plate, after the turning over action is completed, controlling the hydraulic system by the electrical control system to reset the turnover frame, at this time, the workers clean the weld of the girder cover plate and web butt joint steel plate, and then perform the second submerged arc welding; S3: workers perform butt joint and submerged arc welding on other girder cover plates and web butt joint steel plates in the welding gap; S4: after the butt joint and welding of the girder cover plate and web butt joint steel plate are completed, controlling the steel plate lifting device to separate the girder cover plate and web butt joint steel plate from the turnover frame, when the girder cover plate and web butt joint steel plate are lifted to a certain height, cutting the arch on the web butt joint steel plate by a professional bevel cutting equipment, and then controlling the steel plate lifting device to lower the girder cover plate and web butt joint steel plate to the turnover frame; S5: lifting the T-shaped steel to the right-angle head of the T-shaped steel and web butt joint device, and aligning the T-shaped steel with the web height; S6: calculating the maximum deformation of the T-shaped steel and the deformation of the T-shaped steel and web butt joint device at each position, inputting corresponding coefficients into the hydraulic system, and automatically controlling the hydraulic cylinder to drive the right-angle head to move along the sliding table, wherein the action sequence of the T-shaped steel and web butt joint device on the turnover unit is to move from the middle to the two sides in turn, the arches on the T-shaped steel and web gradually coincide in the movement interval, and the workers perform spot welding. S7: T-shaped steel and web spot welding is completed, and submerged arc welding is carried out. After welding is completed, the bridge crane girder T-shaped steel and web butt joint is completed by turning over through a hydraulic turnover mechanism.

2. The bridge crane girder butt joining method of claim 1, wherein, The steel plate lifting device comprises a lifting chassis, sliding guide rails, a lifting platform, a scissor support and a scissor rotating shaft, the sliding guide rails are arranged on the same side of the lifting chassis and the lifting platform respectively, one side of the bottom of the scissor support is slidably connected with the lifting chassis through the sliding guide rails, the other side of the bottom of the scissor support is rotatably connected with the lifting chassis, the middle part of the scissor support is rotatably connected through the scissor rotating shaft, one side of the top of the scissor support is slidably connected with the lifting platform through the sliding guide rails, and the other side of the top of the scissor support is rotatably connected with the lifting platform, and the scissor support is used for realizing platform lifting.

3. The bridge crane girder butt joining method of claim 1, wherein, Both ends of the turnover connecting frame are fixedly connected with the turnover units through bolts respectively.

4. The bridge crane girder butt joining method of claim 2, wherein, The steel plate lifting device further comprises a track frame, and the lifting chassis is slidably arranged on the track frame, and the track frame is used for realizing position adjustment of the steel plate lifting device.

5. The bridge crane girder butt joining method of claim 1, wherein, In S6, the maximum deformation amount Δf of the T-shaped steel can be obtained according to the formula: when the span L of the bridge crane is 15-30 m, Δf = (0.25-0.45) L, when the span L of the bridge crane is 30-40 m, Δf = (0.5-0.8) L, and the specific coefficient can be selected according to the deformation coefficient when the web is cut and arched; according to the above formula, the corresponding coefficient is input in the system, the maximum deformation amount of the T-shaped steel can be calculated, and the action deformation amount of the T-shaped steel and the web butt joint device at each position can be calculated according to the maximum deformation amount.

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