Steel box girder bolt hole group processing method

Abstract

This invention provides a method for processing bolt hole groups in steel box girders. The method includes: S1, drilling bolt hole groups on the connecting plates of the steel box girder according to the design dimensions and requirements; S2, cutting and marking the steel plates; S3, erecting a scaffold in the factory, assembling and welding all plate units with box girder partitions onto the scaffold to form a steel box girder structure; S4, connecting the steel box girders to a preset state on the scaffold according to the design drawings, and then drilling the male ends; S5, the drilling method described in step S4 is implemented using a drilling tool. This method for processing bolt hole groups in steel box girders, before welding and assembling the plate units into a steel box girder, first uses a radial drilling machine to drill the male ends of the plate units, which improves the efficiency of bolt hole group processing compared to magnetic drilling; and the fact that construction personnel can operate the radial drilling machine on the ground compared to operating a magnetic drill on a scaffold platform improves construction safety.

Description

Technical Field

[0001] This invention belongs to the field of steel structure engineering construction technology, and in particular relates to a method for processing bolt hole groups in steel box girders. Background Technology

[0002] Steel box girder structures have large spans and require segmented fabrication. High-strength bolts are primarily used for connection and fixation at these segments. The larger the cross-sectional area of ​​the steel box girder, the more bolt holes need to be machined at the joints. The Qianlidi Grand Bridge on the Jinshi Expressway is a steel box girder structure, fabricated in segments and connected and fixed with 85,000 high-strength bolts. Through technological innovation, it was ensured that all bolts were drilled and qualified on the first attempt.

[0003] Generally, bolt hole groups at the connection points of steel box girders can only be processed after all steel box girders have been assembled, welded, and aligned. To ensure the smooth assembly of dense bolts, the bolt hole groups on the steel box girders are processed in a matching manner with the bolt hole groups on the connecting plates.

[0004] First, the bolt hole group of the connecting plate is processed on the CNC drilling machine according to the drawings. Then, it is fixed on the top, bottom and outer sides of the web of the steel box girder according to the design requirements. Since the steel box girder cannot be moved or rotated at this time, the bolt hole group can only be processed by magnetic drill. When the web of the two sides is constructed with magnetic drill, a scaffolding platform also needs to be erected, which results in slow construction efficiency and poor drilling quality and safety. Summary of the Invention

[0005] In view of this, the present invention aims to propose a method for processing bolt hole groups in steel box girders, so as to solve the problems of slow construction efficiency, poor construction safety, and poor processing accuracy of bolt hole groups.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A method for processing bolt hole groups in steel box girders includes the following construction steps:

[0008] S1. The bolt hole group of the steel box girder connecting plate shall be drilled according to the design drawing dimensions and requirements.

[0009] S2. Steel plate cutting: The top plate, bottom plate, and side webs of the steel box girder are assembled and welded into independent plate units. Then, holes are drilled in each plate unit using a CNC radial drilling machine. The end of the bolt hole group to be processed in the plate unit is the male end. The male end is assembled with the corresponding connecting plate. After assembly, the bolt hole group of the male end is drilled using a CNC radial drilling machine. The female end of the adjacent plate unit connected to the male end is not drilled first.

[0010] S3. Erect a base frame in the factory, and assemble and weld all plate units with box girder partitions on the base frame to form a steel box girder structure.

[0011] S4. After connecting the steel box girder to the preset state on the ground according to the design drawings, perform the drilling processing of the female end: connect the drilled male end of the plate unit to the female end of the corresponding beam segment according to the design drawings, install the male end to the corresponding connecting plate, and use the ink hole method to mark the position of the positioning hole on the female end through the connecting plate; after marking the position of the positioning hole, remove the connecting plate, and drill positioning holes on the female end according to the position of the positioning hole; after drilling the positioning hole, use tooling bolts to fasten and fix the connecting plate to the male end and the female end through the positioning hole, and perform the drilling processing of the bolt hole group on the female end;

[0012] S5. The ink hole method described in step S4 is implemented using an ink hole tool. The implementation steps are as follows: The ink hole tool is made of cylindrical steel. The outer diameter of the ink hole tool is 0.2mm to 0.5mm smaller than the bolt hole diameter. One end of the ink hole tool has a protruding tip, and the other end of the ink hole tool has a patterned end. After the male end is installed with the corresponding connecting plate, the position of the connecting plate positioning hole is selected in the bolt hole group of the female end. The tip of the ink hole tool is driven into the positioning hole of the connecting plate so that the tip contacts the female end face. The patterned end of the ink hole tool is fixed with a wrench, and the wrench is rotated to make the ink hole tool rotate axially more than one revolution. After completing the marking work of the positioning hole position of the connecting plate, the ink hole tool is pulled out of the positioning hole of the connecting plate for subsequent work.

[0013] Furthermore, in step b, one end of the plate unit is the male end, and the other end is the female end. This allocation scheme for the male and female ends applies when the total number of segments in the steel box girder connection is even.

[0014] Furthermore, in step S2, the steel box girders are numbered according to the connection sequence in the design drawings. Even-numbered segments of the steel box girder have both ends as male ends, while odd-numbered segments have both ends as female ends. This allocation scheme of male and female ends applies when the total number of connected segments of the steel box girder is odd.

[0015] Furthermore, in step S2, the male end is connected and assembled with the corresponding connecting plate by spot welding according to the design drawings.

[0016] Furthermore, in step S2, after the male end is assembled with the corresponding connecting plate, when the CNC drilling machine is drilling holes, positioning holes are first drilled at the four corners and the middle part of the bolt hole group of the male end. After the positioning holes are drilled, the connecting plate and the male end are connected and fastened with tooling bolts, and then the remaining bolt hole group of the male end is drilled using the CNC drilling machine.

[0017] Furthermore, the perforator is made of either round steel or round steel pipe.

[0018] Furthermore, in step S5, the positioning hole positions are selected from the four corners and the center of the bolt hole group at the female end.

[0019] Furthermore, in step S3, the ground frame is erected using the upright method, and the plate unit is assembled and welded with the top plate on top and the bottom plate on the bottom.

[0020] The drilling speed of a radial drilling machine is 3 to 5 times that of a magnetic drill. Radial drilling machines are used to drill the male ends of the plate units of the steel box girders throughout the entire bridge section, which improves the construction efficiency of the bolt hole groups of the plate units.

[0021] The bolt hole group at the end of the female plate is processed by first drilling positioning holes and tightening the tooling bolts before proceeding with the construction of the remaining bolt holes. This replaces the traditional spot welding method, preventing the gap between the two steel plates from widening and the connection plate from shifting due to weak welding during the drilling process. This improves the dimensional accuracy of the bolt holes and eliminates the impact of spot welding on the steel plate structure.

[0022] Compared with existing technologies, the bolt hole processing method for steel box girders described in this invention has the following advantages: Before the plate units are welded and assembled into a steel box girder, the male end of the plate unit is first drilled using a radial drilling machine, which improves the processing efficiency of the bolt hole group compared to magnetic drilling; the operation of the radial drilling machine on the ground by construction personnel improves construction safety compared to operating a magnetic drill on a scaffolding platform; the bolt hole group at the female end is processed by first drilling positioning holes, and then tightening the tooling bolts before proceeding with the construction of the remaining bolt holes, which prevents the gap between the two steel plates from increasing and the connection plates from shifting due to weak welding during the drilling process, thus improving the dimensional accuracy of the bolt hole group and eliminating the impact of spot welding on the steel plate structure; the use of the marking hole method for positioning the positioning holes at the female end results in good marking effect, facilitates construction, and improves the marking efficiency of the positioning holes. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A schematic diagram of the connecting plate described in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the drilling method for the male end bolt hole group described in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the steel box girder structure described in the embodiment of the present invention;

[0027] Figure 4A schematic diagram of the drilling method for the bolt hole group at the female end as described in an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the ink hole device described in an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the ink hole construction method described in the embodiment of the present invention;

[0030] Figure 7 A schematic diagram illustrating the processing effect of the bolt hole group of the steel box girder as described in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Connecting plate; 2-Top plate; 3-Bottom plate; 4-Web plate; 5-Plate unit; 51-Male end; 52-Female end; 6-Bolt hole group; 61-Male end bolt hole group; 62-Female end bolt hole group; 7-Positioning hole; 8-Pattern hole device; 9-Tip; 10-Pattern end; 11-Box girder partition. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] Example 1

[0038] like Figure 1-7 As shown, a method for processing bolt hole groups in a steel box girder includes the following construction steps:

[0039] S1. The bolt hole group 6 of the steel box girder connecting plate 1 shall be drilled according to the design dimensions and requirements, such as... Figure 1 As shown;

[0040] S2. The steel plates are cut and assembled. The top plate 2, bottom plate 3, and side webs 4 of the steel box girder are welded into independent plate units 5. Then, each plate unit 5 is drilled using a CNC radial drilling machine. The end of the bolt hole group to be processed in the plate unit 5 is the male end 51. The male end 51 is connected to the corresponding connecting plate 1 by spot welding according to the design drawings. When drilling with the CNC drilling machine, positioning holes 7 are first drilled at the four corners and the middle of the entire drilling area of ​​the male end. Figure 2 As shown; after the positioning holes are drilled, the connecting plate and the male end are connected and fastened with tooling bolts, and then the remaining male end bolt hole group 61 is drilled using a CNC drilling machine; the female end 52 of the adjacent plate unit connected to the male end 51 is not drilled first;

[0041] S3. A foundation frame is erected within the factory. The foundation frame is erected using a top-mounted method. All plate units 5, along with box girder partitions 11, are assembled and welded onto the foundation frame with the top plate on top and the bottom plate on the bottom to form a steel box girder structure. Figure 3 As shown;

[0042] S4. Connect the steel box girders on the ground according to the design drawings to a preset state, the preset state being a bridge state, and perform drilling processing on the mother end 52: such as Figure 4 As shown, the male end 51 of the plate unit 5, which has been drilled and machined, is connected to the female end 52 of the corresponding beam segment according to the design drawing. The male end 51 is installed with the corresponding connecting plate 1. The position of the positioning hole 7 is marked on the female end 52 through the connecting plate 1 using the ink hole method. After the positioning hole position 7 is marked, the connecting plate 1 is removed, and the positioning hole 7 is drilled on the female end face according to the position of the positioning hole 7. After the positioning hole 7 is drilled, the connecting plate 1 is fastened and fixed to the male end 51 and the female end 52 through the positioning hole using tooling bolts. The bolt hole group 62 of the female end is then drilled.

[0043] S5. The hole-making method described in step S4 is implemented using a hole-making device 8. The implementation steps are as follows: the hole-making device 8 is made of round steel, and its outer diameter is 0.2mm to 0.5mm smaller than the bolt hole diameter. One end of the hole-making device 8 has a protruding tip 9, and the other end of the hole-making device 8 has a patterned end 10. Figure 5 As shown; after the male end 51 is installed with the corresponding connecting plate 1, the position of the positioning hole 7 of the connecting plate is selected in the bolt hole group 62 of the female end. The position of the positioning hole 7 is selected from the bolt hole positions at the four corners and the center of the entire drilled part of the female end 52, as shown. Figure 4 As shown; the tip 9 of the ink nozzle is inserted into the positioning hole of the connecting plate, so that the tip 9 contacts the female end face 52, as shown. Figure 6 As shown, use a wrench to fix the patterned end 10 of the ink hole device and rotate the wrench to make the ink hole device 8 rotate axially more than one revolution. After completing the marking work of the position of the positioning hole 7 of the connecting plate, pull the ink hole device 8 out of the positioning hole 7 of the connecting plate and proceed with the subsequent work.

[0044] In step S2, one end of the plate unit 5 is a male end 51, and the other end is a female end 52. The allocation scheme of the male end 51 and the female end 52 is applied when the total number of segments in the steel box girder connection is even, such as... Figure 3 As shown.

[0045] Example 2

[0046] like Figure 1-7 As shown, a method for processing bolt hole groups in a steel box girder includes the following construction steps:

[0047] S1. The bolt hole group 6 of the steel box girder connecting plate 1 shall be drilled according to the design dimensions and requirements, such as... Figure 1 As shown;

[0048] S2. The steel plates are cut and assembled. The top plate 2, bottom plate 3, and side webs 4 of the steel box girder are welded into independent plate units 5. Then, each plate unit 5 is drilled using a CNC radial drilling machine. The end of the bolt hole group to be processed in the plate unit 5 is the male end 51. The male end 51 is connected to the corresponding connecting plate 1 by spot welding according to the design drawings. When drilling with the CNC drilling machine, positioning holes 7 are first drilled at the four corners and the middle of the entire drilling area of ​​the male end. Figure 2 As shown; after the positioning holes are drilled, the connecting plate and the male end are connected and fastened with tooling bolts, and then the remaining male end bolt hole group 61 is drilled using a CNC drilling machine; the female end 52 of the adjacent plate unit connected to the male end 51 is not drilled first;

[0049] S3. A foundation frame is erected within the factory. This foundation frame is erected using a forward assembly method, assembling and welding the steel box girder plate units with the top plate on top and the bottom plate on the bottom. All plate units 5, along with box girder partitions 11, are then assembled and welded onto the foundation frame to form a steel box girder structure. Figure 3 As shown;

[0050] S4. Connect the steel box girders on the ground according to the design drawings to a preset state, the preset state being a bridge state, and perform drilling processing on the mother end 52: such as Figure 4 As shown, the male end 51 of the plate unit 5, which has been drilled and machined, is connected to the female end 52 of the corresponding beam segment according to the design drawing. The male end 51 is installed with the corresponding connecting plate 1. The position of the positioning hole 7 is marked on the female end 52 through the connecting plate 1 using the ink hole method. After the positioning hole position 7 is marked, the connecting plate 1 is removed, and the positioning hole 7 is drilled on the female end face according to the position of the positioning hole 7. After the positioning hole 7 is drilled, the connecting plate 1 is fastened and fixed to the male end 51 and the female end 52 through the positioning hole using tooling bolts. The bolt hole group 62 of the female end is then drilled.

[0051] S5. The drilling method described in step S4 is implemented using a drilling tool 8. The implementation steps are as follows: the drilling tool 8 is made of round steel pipe, the outer diameter of the drilling tool 8 is 0.2mm to 0.5mm smaller than the bolt hole diameter, one end of the drilling tool 8 has a protruding tip 9, and the other end of the drilling tool 8 has a patterned end 10, such as... Figure 5 As shown; after the male end 51 is installed with the corresponding connecting plate 1, the position of the positioning hole 7 of the connecting plate is selected in the bolt hole group 62 of the female end. The position of the positioning hole 7 is selected from the bolt hole positions at the four corners and the center of the entire drilled part of the female end 52, as shown. Figure 4 As shown; the tip 9 of the ink nozzle is inserted into the positioning hole of the connecting plate, so that the tip 9 contacts the female end face 52, as shown. Figure 6 As shown, use a wrench to fix the patterned end 10 of the ink hole device and rotate the wrench to make the ink hole device 8 rotate axially more than one revolution. After completing the marking work of the position of the positioning hole 7 of the connecting plate, pull the ink hole device 8 out of the positioning hole 7 of the connecting plate and proceed with the subsequent work.

[0052] In step S2, the steel box girders are numbered according to the longitudinal installation sequence in the design drawings. The even-numbered segments of the steel box girder plate unit 5 have male ends 51 at both ends, and the odd-numbered segments have female ends 52 at both ends. Figure 7 As shown, the allocation scheme of the male end 51 and the female end 52 is applied when the total number of segments in the steel box girder connection is odd.

[0053] The drilling speed of a radial drilling machine is 3 to 5 times that of a magnetic drill. Radial drilling machines are used to drill the male ends 51 of the steel box girder plate unit 5 throughout the entire bridge section, which improves the construction efficiency of the bolt hole group 6 of plate unit 5.

[0054] The bolt hole group 6 at the end of the female is constructed by first drilling the positioning holes 7, tightening the tooling bolts, and then constructing the remaining bolt hole group 6. This method replaces the traditional spot welding method, which prevents the gap between the two steel plates from increasing and the connection plate 1 from shifting due to insecure welding during the drilling of the bolt hole group 6. This improves the dimensional accuracy of the bolt hole group 6 and eliminates the impact of spot welding on the steel plate structure.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for processing bolt hole groups of a steel box girder, characterized by: The construction steps include the following: S1. The bolt hole group (6) of the steel box girder connecting plate (1) shall be drilled according to the design dimensions and requirements. S2. Steel plate cutting: The top plate (2), bottom plate (3), and side web plates (4) of the steel box girder are assembled and welded into independent plate units (5). Then, each section of plate unit (5) is drilled with a CNC radial drilling machine. The end of the bolt hole group (6) to be processed in the plate unit (5) is the male end (51). The male end (51) is assembled with the corresponding connecting plate (1). After assembly, the bolt hole group (6) of the male end (51) is drilled with a CNC radial drilling machine. The female end (52) of the adjacent plate unit (5) connected to the male end (51) is not drilled first. After the male end (51) is assembled with the corresponding connecting plate (1), when drilling with a CNC drilling machine, first drill positioning holes (7) at the four corners and the middle part of the bolt hole group (6) of the male end (51). After the positioning holes (7) are drilled, use tooling bolts to connect and fasten the connecting plate (1) and the male end (51). Then use a CNC drilling machine to drill the remaining bolt hole group (6) of the male end (51). S3. Erect a ground frame in the factory, and assemble and weld all the plate units (5) and box beam partitions (11) on the ground frame to form a steel box beam structure. S4. After connecting the steel box girder to the preset state on the ground according to the design drawing, the female end (52) is drilled: the male end (51) of the plate unit (5) that has been drilled is connected to the female end (52) of the corresponding beam segment according to the design drawing. The male end (51) is installed with the corresponding connecting plate (1). The position of the positioning hole (7) is marked on the female end (52) through the connecting plate (1) using the ink hole method. After marking the position of the positioning hole (7), the connecting plate (1) is removed. The positioning hole (7) is drilled on the female end (52) according to the position of the positioning hole (7). After drilling the positioning hole (7), the connecting plate (1) is fastened to the male end (51) and the female end (52) through the positioning hole (7) using tooling bolts. The bolt hole group (6) of the female end (52) is drilled. S5. The hole-making method described in step S4 is implemented using a hole-making device (8). The hole-making device (8) is made of cylindrical steel. The outer diameter of the hole-making device (8) is 0.2mm~0.5mm smaller than the bolt hole diameter. One end of the hole-making device (8) has a protruding tip (9), and the other end of the hole-making device (8) has a patterned end (10). After the male end (51) is installed with the corresponding connecting plate (1), the bolt holes (6) in the female end (52) are... Select the position of the positioning hole (7) of the connecting plate (1), insert one end of the tip (9) of the ink hole tool (8) into the positioning hole (7) of the connecting plate (1), so that the tip (9) contacts the female end face, fix the patterned end (10) of the ink hole tool (8) with a wrench and rotate the wrench to rotate the ink hole tool (8) axially more than one revolution. After completing the marking work of the position of the positioning hole (7) of the connecting plate (1), pull the ink hole tool (8) out of the positioning hole (7) of the connecting plate (1) and proceed with the subsequent work.

2. The method for processing bolt hole groups in a steel box girder according to claim 1, characterized in that: In step S2, one end of the plate unit (5) is the male end (51) and the other end is the female end (52). The allocation scheme of the male end (51) and the female end (52) is applied to the case where the total number of segments in the steel box girder connection is even.

3. The method for processing bolt hole groups in a steel box girder according to claim 2, characterized in that: In step S2, the steel box girder is numbered according to the connection sequence of the design drawing. Both ends of the even-numbered steel box girder plate unit (5) are male ends (51), and both ends of the odd-numbered steel box girder plate unit (5) are female ends (52). The allocation scheme of the male ends (51) and the female ends (52) is applied to the case where the total number of steel box girder connection segments is odd.

4. The method for processing bolt hole groups in a steel box girder according to claim 2, characterized in that: In step S2, the male end (51) and the corresponding connecting plate (1) are connected and assembled according to the design drawings by spot welding.

5. The method for processing bolt hole groups in a steel box girder according to claim 1, characterized in that: The perforator (8) can be made of any one of round steel or round steel pipe.

6. The method for processing bolt hole groups in a steel box girder according to claim 1, characterized in that: In step S5, the positioning hole (7) is selected from the bolt hole positions at the four corners and the center of the bolt hole group (6) at the female end (52).

7. The method for processing bolt hole groups in a steel box girder according to claim 1, characterized in that: In step S3, the ground frame is erected using the upright method, and the plate unit (5) is assembled and welded with the top plate (2) on top and the bottom plate (3) on the bottom.

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