A method of manufacturing a steel crane girder

Abstract

The application provides a manufacturing method of a steel crane beam, which comprises the following steps: S1, performing crane beam camber manufacturing: blanking upper flanges, lower flanges and webs of the crane beam; heating the connecting edge of the web and the lower flange until the whole web is cambered; assembling the upper flange, the lower flange and the web on an assembling jig to assemble an H-shaped steel; and welding the H-shaped steel to form the crane beam; S2, performing drilling operation on the upper flange: vertically placing the crane beam with the upper flange facing downward and the lower flange facing upward; setting end supports and connecting the end supports with end plates corresponding to the two ends of the crane beam; symmetrically setting two pairs of auxiliary supports at intervals between the two ends of the crane beam; manufacturing a steel drill jig and drilling; and positioning and drilling the upper flange through the steel drill jig. The method solves the problems of material waste and low efficiency caused by the traditional crane beam camber manufacturing method by adopting the web heating and inverted drilling technology.

Description

Technical Field

[0001] This application relates to the field of mechanical equipment, and more particularly to a method for manufacturing a steel crane beam. Background Technology

[0002] Crane beams are key structural components in industrial buildings that support crane tracks. They are typically installed beneath the roof of factory buildings or warehouses to provide running tracks for overhead cranes and other similar structures. These steel beams are mostly welded H-beam structures, and their cross-sectional dimensions can be customized to meet specific needs, offering good economic efficiency and applicability.

[0003] Given that crane beams exhibit downward deflection under load, an upward camber must be pre-installed during the manufacturing stage to counteract this phenomenon. The design and implementation of this camber is crucial for ensuring the straightness and stability of the crane beam during its service life. The "Standard for Acceptance of Construction Quality of Steel Structures" (GB50205-2020) requires checking the camber of completed crane beams and identifying any downward deflection.

[0004] For crane beams with a span not exceeding 24 meters, design drawings typically do not specify a particular camber value, but instead require manufacturers to take appropriate camber measures to ensure the finished product does not deflect. Current camber methods mainly include two types: One is to pre-form the camber shape during web cutting, primarily by creating an arc-shaped camber on the web and then using flame cutting; this method leads to material waste and relies on CNC cutting, resulting in relatively low efficiency. The second method involves using flame heating in conjunction with tools such as chain hoists and jacks to apply external force to the pre-fabricated H-beam to deform it and achieve the camber effect; however, this method of applying external force may damage the base material, and improper operation can easily lead to sudden changes in local angles or overall twisting of the component.

[0005] In addition, the upper flange of the crane beam has continuous high-strength bolt holes for connecting the rail tie plates and brake plates. The precise positioning of these holes is crucial for installation and structural safety. Due to uncontrollable deformation during manufacturing, these holes are usually drilled after the crane beam is fabricated and straightened. Vertical drilling poses safety hazards, and increasingly, designs prohibit welding any accessories other than those specified in the construction drawings onto the flanges and webs of the crane beam H-section steel. Additional welding operations on the main material are also not permitted. This increases the difficulty of setting up temporary supports during vertical drilling and further increases the safety hazards. Horizontal drilling, on the other hand, is complex to operate, inefficient, and makes it difficult to guarantee drilling accuracy. Summary of the Invention

[0006] This application provides a method for manufacturing a steel crane beam, which aims to solve the problem of poor manufacturing quality of existing crane beams.

[0007] The technical solution of this application is: A method for manufacturing a steel crane beam includes the following steps: S1, the camber fabrication of the crane beam includes the following steps: S11. According to the design drawings and based on experience data and welding shrinkage allowance, the upper flange, lower flange, and web of the crane beam are cut into pieces respectively. S12, after the web plate has passed inspection and is marked in the direction, heat the connection between the web plate and the lower flange by flame heating or electric heating until the web plate arches upward as a whole. S13, the upper flange, the lower flange, and the web are assembled on the assembly jig to assemble the H-beam; the assembled H-beam is welded, first the weld between the web and the lower flange is welded, and then the weld between the web and the upper flange is welded, and each welding starts from the same end of the crane beam and each weld is continuously welded in one pass to form the crane beam; S2, Drilling the upper flange includes the following steps: S21, the crane beam is placed upright with the upper flange facing down and the lower flange facing up, and rolled H-beams are provided at both ends of the crane beam as support points; S22, Set end supports and connect the end supports to the corresponding end plates at both ends of the crane beam; S23, multiple pairs of auxiliary supports are symmetrically arranged at intervals between the two ends of the crane beam; S24, a steel drill mold is made using a steel plate, and holes are drilled in the steel drill mold according to the design requirements of hole diameter and hole spacing using a CNC drilling machine to form a plurality of first positioning holes; a steel template is made using the steel drill mold; S25, positioning and drilling holes are performed on the upper flange using the steel template: Drilling positioning lines are drawn on the inner surface of the upper flange of the inverted crane beam according to the hole spacing at the outermost ends of the steel drill mold; the first positioning holes at the outermost ends of the steel drill mold are aligned with the hole positioning lines on the upper flange; the steel drill mold is fastened to the upper flange, and holes are drilled in the upper flange according to the first positioning holes on the steel drill mold; after the first batch of holes on the upper flange is drilled, the steel drill mold is moved, and then the steel drill mold is... The first positioning hole on the upper flange is aligned with the last hole in the drilled holes on the upper flange. Drilling positioning lines are drawn on the inner surface of the upper flange of the inverted crane beam according to the hole spacing at the outermost ends of the steel drill jig. The first positioning holes at the outermost ends of the steel drill jig are aligned with the hole positioning lines on the upper flange. The steel drill jig is then fastened to the upper flange, and holes are drilled in the upper flange according to the first positioning holes on the steel drill jig. The above operation is repeated until all holes on the upper flange are drilled.

[0008] As a technical solution of this application, in step S11, the lengths of the upper flange, the lower flange, and the web are all increased by 0.11%L of welding shrinkage allowance, where L is the length of the crane beam.

[0009] As a technical solution of this application, in step S12, the connection between the web plate and the lower flange is heated by flame heating, wherein the heating temperature is 120°C ~ 150°C.

[0010] As a technical solution of this application, in step S22, the end bracket includes a first crossbeam, two first base plates and two first legs; the two first base plates are spaced apart and at the same height; the two first legs are arranged in a figure-eight shape and respectively disposed on the corresponding first base plates, and the included angle between each first leg and the horizontal plane is 45°-60°; the two ends of the first crossbeam are respectively connected between the two first legs, and the first crossbeam is horizontally disposed.

[0011] As a technical solution of this application, in step S22, the first bolt hole on the first crossbeam is aligned with the second bolt hole on the end plate at the end of the crane beam, and bolts are inserted into the corresponding first bolt hole and second bolt hole and fixed.

[0012] As one technical solution of this application, the first crossbeam and the first support leg are both made of angle steel, and the first base plate is made of steel plate.

[0013] As one technical solution of this application, the auxiliary support includes a second crossbeam, two supports, two second base plates, and two second legs; the two second base plates are spaced apart and at the same height; the two second legs are arranged in a figure-eight shape and respectively set on the corresponding second base plates, and the included angle between each second leg and the horizontal plane is 45°-60°; the two ends of the second crossbeam are respectively connected between the two second legs, and the second crossbeam is horizontally set.

[0014] As one technical solution of this application, multiple sets of fastening components are installed at intervals on the bottom of the steel drill jig, arranged along the length direction of the steel drill jig. Each set of fastening components includes a horizontal positioning plate and a side positioning plate. The side positioning plate is vertically arranged and its top end is connected to one side of the bottom of the steel drill jig along the length direction of the steel drill jig. The horizontal positioning plates are arranged parallel to each other directly below the steel drill jig, and one end is vertically connected to the lower part of one side of the corresponding side positioning plate, and together with the steel drill jig and the side positioning plates, they form a positioning cavity for accommodating the upper flange.

[0015] As one technical solution of this application, the side positioning plate has a second positioning hole, in which a limiting pin is detachably provided, and the limiting pin is used to limit the horizontal direction of the steel drill jig; the horizontal positioning plate has a third positioning hole, in which a positioning pin is detachably provided, and the positioning pin is used to position the vertical direction of the steel drill jig.

[0016] The beneficial effects of this application are: This application provides a method for manufacturing a steel crane beam. In the cambering process, the connection between the web and the lower flange is heated by flame or electricity, causing it to slightly shrink and camber upon cooling. This is combined with an optimized welding sequence: first welding the web to the lower flange, then the web to the upper flange. The camber is achieved through welding deformation, avoiding the material waste and inefficiency associated with traditional pre-fabricated cambering of the web. Furthermore, by employing inverted drilling and multi-point support techniques, it solves the safety hazards of vertical drilling and the accuracy control problems of horizontal drilling, while adhering to design and specification requirements, enabling simple and practical drilling operations. In addition, the use of steel drill jigs simplifies the drilling process, improves drilling speed and accuracy, and meets the demands for high-quality drilling. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the welding sequence of the crane beam H-beam provided in an embodiment of this application; Figure 2 This is a schematic diagram of an inverted crane beam support provided in an embodiment of this application; Figure 3 This is a side view of the inverted support of a crane beam provided in an embodiment of this application; Figure 4 A schematic diagram of the end bracket provided in an embodiment of this application; Figure 5 A schematic diagram of the auxiliary support provided in the embodiments of this application; Figure 6 A schematic diagram of a steel drill jig provided in an embodiment of this application; Figure 7 This is a schematic diagram of the first angle of the steel drill jig provided in an embodiment of this application; Figure 8 This is a schematic diagram of the second angle of the steel drill jig provided in an embodiment of this application; Figure 9 This is a schematic diagram of the drilling positioning lines on the upper flange provided in an embodiment of this application; Figure 10 This is a schematic diagram of drilling holes in a steel formwork provided in an embodiment of this application; Figure 11 This is a schematic diagram of continuous drilling of steel formwork provided in an embodiment of this application.

[0019] Icons: 1-Upper flange; 2-Lower flange; 3-Web plate; 4-Support point; 5-First leg; 6-First crossbeam; 7-First base plate; 8-Second leg; 9-Second crossbeam; 10-Support; 11-Second base plate; 12-Steel drill jig; 13-Side positioning plate; 14-Horizontal positioning plate; 15-Connecting pin; 16-Positioning pin; 17-Limiting pin. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] Example: Please refer to Figure 1 (Refer to) Figures 2 to 11 This application provides a method for manufacturing a steel crane beam, including the following steps: S1, the camber fabrication of the crane beam includes the following steps: S11. According to the design drawings and based on experience data and welding shrinkage allowance, the upper flange 1, lower flange 2, and web 3 of the crane beam are cut into pieces respectively. S12, mark the direction of the web plate 3 after the material is cut and inspected, and heat the connection between the web plate 3 and the lower flange 2 by flame heating or electric heating until the web plate 3 is slightly arched. S13. Assemble the upper flange 1, lower flange 2, and web 3 on the assembly jig to assemble the H-beam. During assembly, pay attention to verifying the orientation of the web 3 and ensuring its heated edge is aligned with the lower flange 2. Weld the assembled H-beam to form a crane beam. For details, please refer to... Figure 1 First, weld the seams between the web 3 and the lower flange 2 in sequence ① and ②, then weld the seams between the web 3 and the upper flange 1 in sequence ③ and ④. This ensures that the welding deformation is directed in a direction conducive to arching. Each welding operation should begin from the same end of the crane beam, and each weld should be completed continuously in one pass. It should be noted that all four main welds of the crane beam must be completed on the same day to prevent deformation caused by reheating after the crane beam has completely cooled. S2, Drilling operation on the upper flange 1, which includes the following steps: S21, the crane beam is placed upright with the upper flange 1 facing down and the lower flange 2 facing up, and rolled H-beams are set at both ends of the crane beam as support points 4; S22, Set end supports and connect the end supports to the corresponding end plates at both ends of the crane beam; S23, multiple pairs of auxiliary supports are symmetrically arranged at intervals between the two ends of the crane beam; S24, a steel drill mold 12 is made using a steel plate. Holes are drilled in the steel drill mold 12 according to the design requirements for hole diameter and hole spacing using CNC drilling equipment. The hole diameter and hole spacing should meet the design and specification requirements to form multiple first positioning holes. A steel template is made using the steel drill mold 12. S25, positioning and drilling of the upper flange 1 using a steel template: Draw drilling positioning lines on the inner surface of the upper flange 1 of the inverted crane beam according to the outermost hole spacing at both ends of the steel drill mold 12. Align the first positioning holes at both ends of the steel drill mold 12 with the hole positioning lines on the upper flange 1. Insert the connecting pin 15 into the first positioning hole on the steel drill mold 12, and then tighten the positioning pin 16 and the limiting pin 17 respectively, thereby securing the steel drill mold 12 to the upper flange 1. Drill holes in the upper flange 1 according to the first positioning holes on the steel drill mold 12. After the first batch of holes on the upper flange 1 is drilled, move the steel drill mold 12, and then drill the first... One of the first positioning holes is aligned with the last hole in the drilled holes on the upper flange 1. Drilling positioning lines are drawn on the inner surface of the upper flange 1 of the inverted crane beam according to the hole spacing at both ends of the steel drill jig 12. The first positioning holes at both ends of the steel drill jig 12 are aligned with the hole positioning lines on the upper flange 1. The connecting pin 15 is inserted into the first positioning hole on the steel drill jig 12 again. Then, the positioning pin 16 and the limiting pin 17 are tightened again to secure the steel drill jig 12 to the upper flange 1. Drilling is then performed on the upper flange 1 according to the first positioning hole on the steel drill jig 12. The above operation is repeated until all the drilling on the upper flange 1 is completed.

[0023] Furthermore, welding shrinkage allowance refers to the difference between the final size of the welded part and the expected size due to the thermal expansion and subsequent shrinkage of the material during welding. In this embodiment, in step S11, the lengths of the upper flange 1, lower flange 2, and web 3 are all increased by a welding shrinkage allowance of 0.11%L, where L is the length of the crane beam. Simultaneously, the web 3 of the crane beam is cut into a rectangular shape, without the need for additional pre-camber.

[0024] It should be noted that the heating temperature should be set comprehensively considering factors such as the thickness of the steel, its chemical composition, and the ambient temperature. In this embodiment, in step S12, the connection between the web 3 and the lower flange 2 is heated by flame heating or electric heating, with a heating temperature of 120°C to 150°C. After heating and cooling, the web 3 may undergo slight shrinkage deformation at the connection with the lower flange 2, meaning the web 3 as a whole will slightly arch upwards.

[0025] In addition, in step S21, all components should be completed and inspected before the crane beam is inverted.

[0026] Meanwhile, in step S22, the end support includes a first crossbeam 6, two first base plates 7, and two first legs 5; the two first base plates 7 are spaced apart and at the same height; the two first legs 5 are arranged in a V-shape and welded to the corresponding first base plates 7 respectively. To ensure the stability of the end support, the angle between each first leg 5 and the horizontal plane is 45°-60°; the two ends of the first crossbeam 6 are welded between the two first legs 5 respectively, and the first crossbeam 6 is horizontally positioned. Specifically, the first bolt holes on the first crossbeam 6 are aligned with the second bolt holes on the end plate at the end of the crane beam, and bolts are inserted into the corresponding first and second bolt holes and fixed.

[0027] It should be noted that the first crossbeam 6 and the first support leg 5 are both made of angle steel, while the first base plate 7 is made of steel plate. Furthermore, a first bolt hole is drilled in the middle of the first crossbeam 6, and the number, diameter, and position of the first bolt hole are consistent with the second bolt holes on the crane beam end plate. Simultaneously, the second bolt hole on the end plate closest to half the height of the crane beam section can be selected for connection. After determining the position of the second bolt hole on the crane beam end plate, the positioning elevation of the first bolt hole in the middle of the first crossbeam 6 in the end bracket can be calculated using trigonometric functions based on the elevation of the second bolt hole, the height of the steel section of support point 4, and the angle between the first support leg 5 arranged in a V-shape in the end bracket and the horizontal plane. This elevation is then used to determine the welding position between the first crossbeam 6 of the end bracket and the first support leg 5 in the end bracket.

[0028] Furthermore, the auxiliary support includes a second crossbeam 9, two supports 10, two second base plates 11, and two second legs 8; the two second base plates 11 are spaced apart and at the same height; the two second legs 8 are arranged in a V-shape and welded to the corresponding second base plates 11 respectively. To ensure the stability of the auxiliary support, the included angle between each second leg 8 and the horizontal plane is 45°-60°; the two ends of the second crossbeam 9 are welded between the two second legs 8 respectively, and the second crossbeam 9 is set horizontally.

[0029] Specifically, holes are drilled in the second leg 8 and the second crossbeam 9 of the auxiliary support, and bolts are used to connect the second crossbeam 9 to the second leg 8, which is arranged in a V-shape. The second crossbeam 9 is horizontally positioned, ensuring that its top end has a 5-10mm gap from the upper flange 1 of the inverted crane beam. Furthermore, the support 10 in the auxiliary support is horizontally positioned to support the inner side of the lower flange 2 of the inverted crane beam. The support 10 in the auxiliary support is made of angle steel, with one leg of the angle steel placed below the lower flange 2 of the inverted crane beam, leaving a gap of approximately 5mm between it and the lower flange 2. The positioning elevations of the second crossbeam 9 and the support 10 can be calculated using trigonometric functions based on the elevations of the upper flange 1, the lower flange 2, and the angle between the second leg 8 and the horizontal plane. These elevations, combined with the reserved gaps, are used to determine the welding position between the support 10 and the second leg 8 in the auxiliary support, as well as the positioning of the bolt holes connecting the second crossbeam 9 and the second leg 8.

[0030] Furthermore, multiple sets of fastening components are installed at intervals on the bottom of the steel drill jig 12 along the length direction of the steel drill jig 12. Each set of fastening components includes a horizontal positioning plate 14 and a side positioning plate 13 made of steel plate. The side positioning plate 13 is vertically arranged and its top end is connected to one side of the bottom of the steel drill jig 12 along the length direction of the steel drill jig 12. The horizontal positioning plates 14 are arranged parallel to each other directly below the steel drill jig 12, and one end is vertically connected to the lower part of one side of the corresponding side positioning plate 13. Together with the steel drill jig 12 and the side positioning plates 13, they form a positioning cavity for accommodating the upper flange 1.

[0031] It should be noted that the side positioning plate 13 has a second positioning hole, in which a limiting pin 17 is detachably installed. The limiting pin 17 is used to limit the horizontal direction of the steel drill jig 12. The horizontal positioning plate 14 has a third positioning hole, in which a positioning pin 16 is detachably installed. The positioning pin 16 is used to position the steel drill jig 12 in the vertical direction. The diameters of the second and third positioning holes can be determined as needed. Furthermore, the connecting pin 15, the positioning pin 16, and the limiting pin 17 are all made of round steel through precision machining.

[0032] In summary, this application provides a method for manufacturing a steel crane beam. In the arching manufacturing process, the connection between the web plate 3 and the lower flange 2 is heated by flame or electricity, causing it to cool and then slightly shrink and arch upwards. Combined with the optimized welding sequence of first welding the weld between the web plate 3 and the lower flange 2, and then welding the weld between the web plate 3 and the upper flange 1, the arching is achieved by utilizing welding deformation, thus avoiding the material waste and low efficiency problems of traditional prefabricated arching shapes of the web plate. Meanwhile, the drilling process of its upper flange 1 adopts inverted drilling and multi-point support technology. After the crane beam is inverted, it is unloaded by a support system with end brackets and bolted to its end plates and auxiliary brackets supporting multiple points. This completely avoids the adverse effects of the component's self-weight and temporary construction load on arching during the construction stage of traditional vertical drilling. At the same time, there is no need for additional welding on the main material, eliminating the high-altitude safety hazards of vertical drilling. Furthermore, the use of steel drill jigs 12 with horizontal positioning plates 14 and side positioning plates 13, and pins, enables rapid and accurate drilling positioning and continuous operation, solving the problem of difficulty in ensuring the accuracy of horizontal drilling. This inverted solution has the advantages of safe ground operation, meeting safety and accuracy requirements, compliant support system, low equipment requirements, high drilling efficiency and stable accuracy during the construction stage. Through process and tooling innovation, the manufacturing quality and economy of the crane beam are comprehensively improved.

[0033] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for manufacturing a steel crane beam, characterized in that, Includes the following steps: S1, the camber fabrication of the crane beam includes the following steps: S11. According to the design drawings and based on experience data and welding shrinkage allowance, the upper flange, lower flange, and web of the crane beam are cut into pieces respectively. S12, after the web plate has passed inspection and is marked in the direction, heat the connection between the web plate and the lower flange by flame heating or electric heating until the web plate arches upward as a whole. S13, the upper flange, the lower flange, and the web are assembled on the assembly jig to assemble the H-beam; the assembled H-beam is welded, first the weld between the web and the lower flange is welded, and then the weld between the web and the upper flange is welded, and each welding starts from the same end of the crane beam and each weld is continuously welded in one pass to form the crane beam; S2, Drilling the upper flange includes the following steps: S21, the crane beam is placed upright with the upper flange facing down and the lower flange facing up, and rolled H-beams are provided at both ends of the crane beam as support points; S22, setting end supports and connecting the end supports to the corresponding end plates at both ends of the crane beam; in step S22, the end supports include a first crossbeam, two first base plates, and two first legs; the two first base plates are spaced apart and at the same height; the two first legs are arranged in a V-shape and respectively set on the corresponding first base plates, and the angle between each first leg and the horizontal plane is 45°-60°; the two ends of the first crossbeam are respectively connected between the two first legs, and the first crossbeam is horizontally set; S23, multiple pairs of auxiliary supports are symmetrically arranged at intervals between the two ends of the crane beam; S24, a steel drill mold is made using a steel plate, and holes are drilled in the steel drill mold according to the design requirements of hole diameter and hole spacing using a CNC drilling machine to form a plurality of first positioning holes; a steel template is made using the steel drill mold; S25, positioning and drilling holes are performed on the upper flange using the steel template: Drilling positioning lines are drawn on the inner surface of the upper flange of the inverted crane beam according to the hole spacing at the outermost ends of the steel drill mold; the first positioning holes at the outermost ends of the steel drill mold are aligned with the hole positioning lines on the upper flange; the steel drill mold is fastened to the upper flange, and holes are drilled in the upper flange according to the first positioning holes on the steel drill mold; after the first batch of holes on the upper flange is drilled, the steel drill mold is moved, and then the steel drill mold is... The first positioning hole on the upper flange is aligned with the last hole in the drilled holes on the upper flange. Drilling positioning lines are drawn on the inner surface of the upper flange of the inverted crane beam according to the hole spacing at the outermost ends of the steel drill jig. The first positioning holes at the outermost ends of the steel drill jig are aligned with the hole positioning lines on the upper flange. The steel drill jig is then fastened to the upper flange, and holes are drilled in the upper flange according to the first positioning holes on the steel drill jig. The above operation is repeated until all holes on the upper flange are drilled.

2. The method for manufacturing a steel crane beam according to claim 1, characterized in that, In step S11, the lengths of the upper flange, the lower flange, and the web are all increased by 0.11%L for welding shrinkage allowance, where L is the length of the crane beam.

3. The method for manufacturing a steel crane beam according to claim 1, characterized in that, In step S12, the connection between the web and the lower flange is heated by flame heating, wherein the heating temperature is 120°C to 150°C.

4. The method for manufacturing a steel crane beam according to claim 1, characterized in that, In step S22, the first bolt hole on the first crossbeam is aligned with the second bolt hole on the end plate at the end of the crane beam, and bolts are inserted into the corresponding first bolt hole and second bolt hole and fixed.

5. The method for manufacturing a steel crane beam according to claim 1, characterized in that, The first crossbeam and the first support leg are both made of angle steel, and the first base plate is made of steel plate.

6. The method for manufacturing a steel crane beam according to claim 1, characterized in that, The auxiliary support includes a second crossbeam, two supports, two second base plates, and two second legs; the two second base plates are spaced apart and at the same height; the two second legs are arranged in a figure-eight shape and respectively set on the corresponding second base plates, and the included angle between each second leg and the horizontal plane is 45°-60°; the two ends of the second crossbeam are respectively connected between the two second legs, and the second crossbeam is set horizontally.

7. The method for manufacturing a steel crane beam according to claim 1, characterized in that, The bottom of the steel drill jig is equipped with multiple sets of fastening components arranged along the length of the steel drill jig. Each set of fastening components includes a horizontal positioning plate and a side positioning plate. The side positioning plate is vertically arranged and its top end is connected to one side of the bottom of the steel drill jig along the length of the steel drill jig. The horizontal positioning plates are arranged parallel to each other directly below the steel drill jig, and one end is vertically connected to the lower part of one side of the corresponding side positioning plate. Together with the steel drill jig and the side positioning plates, they form a positioning cavity to accommodate the upper flange.

8. The method for manufacturing a steel crane beam according to claim 7, characterized in that, The side positioning plate has a second positioning hole, in which a limiting pin is detachably provided. The limiting pin is used to limit the horizontal direction of the steel drill jig. The horizontal positioning plate has a third positioning hole, in which a positioning pin is detachably provided. The positioning pin is used to position the vertical direction of the steel drill jig.

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