A drilling and marking method for a curved steel truss

Abstract

The application provides a drilling and marking method for a curved steel truss, and relates to the technical field of bridge construction.The drilling and marking method for the curved steel truss comprises the following steps: in the stage of blanking of steel plate parts, a laser marking process is adopted to draw plate unit assembly system lines on the inner side web unit of a chord and draw bending system lines on the inner arc side of bending; assembly welding and bending are performed according to the system lines to form a complete chord structure, and the intersection of the plate unit assembly system lines and the bending system lines on the chord structure is found out; the distance of each hole group of the inner side web unit to a reference point is confirmed, and the drilling template is arranged based on the reference point, and the drilling of the inner side web of the chord structure is completed through the drilling template; the hole group position on the outer side web unit is positioned through a reverse hole tooling, and the drilling of the outer side web of the chord structure is completed.The drilling and marking method for the curved steel truss can avoid the drilling position deviation caused by the bending arc compared with the prior art.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and more specifically, to a method for drilling and marking holes in curved steel trusses. Background Technology

[0002] In curved steel truss structures, the chord members require precise bending at the gusset plates. While the bending position is typically indicated by a defined angle in the design, in actual production, factories usually use rounded corners to protect the steel. However, due to the significant difference in the radius of curvature between the inner and outer webs after bending, selecting reference points on the curvature results in large errors, easily leading to drilling position deviations and failing to meet structural design requirements.

[0003] When bending parts are marked, the bending positioning line is set on the inner arc side of the bend to facilitate alignment during bending. However, the hole group of truss members usually adopts the back hole method to improve accuracy. After the steel beam is assembled into a whole, its outer web plate unit cannot be positioned by the existing marking line. However, by manually reversing the line or turning the parts over to mark the line, deviation is easy to occur during alignment, causing misalignment of the inner and outer web plate hole groups, which affects the bolting quality. Summary of the Invention

[0004] The problem this invention aims to solve is: how to avoid drilling position deviation caused by bending arcs.

[0005] This invention provides a method for drilling and marking holes in curved steel trusses, comprising:

[0006] During the steel plate parts cutting stage, laser scribing process is used to draw the plate unit assembly system line on the inner web unit of the chord and the bending system line on the inner arc side of the bend.

[0007] Welding and bending are performed according to the plate unit assembly system line and the bending system line to form a complete chord structure. At the same time, the intersection of the plate unit assembly system line and the bending system line is found on the chord structure, and the intersection point is used as the drilling template reference point.

[0008] Based on the CAD unfolding and layout data, the distance from each hole group of the inner web unit to the reference point is confirmed, and the drilling template is set up based on this. The drilling of the inner web of the chord structure is completed through the drilling template.

[0009] A reverse-hole tool is installed at the end of the chord structure, and the position of the hole group on the outer web unit is located by the reverse-hole tool. The drilling of the outer web of the chord structure is completed by the position of the hole group on the outer web unit.

[0010] The present invention provides a drilling and marking method for curved steel trusses, which, compared with the prior art, has the following beneficial effects, but is not limited to:

[0011] The drilling and scribing method for curved steel trusses described in this invention employs laser scribing during the steel plate part cutting stage. This involves drawing the plate unit assembly system lines on the inner web unit of the chord member and the bending system lines on the inner arc side of the bend. Welding and bending are then performed based on these system lines to form a complete chord structure. The plate unit assembly system lines and bending system lines drawn using the laser scribing method have high precision, and the scribing marks are not easily lost after the members are welded together. The high precision of the inner arc side reference point, using CAD unfolding data as a reference and the geometric relationship between the chord end hole group and the system lines, ensures that the measurement and control references for all member hole groups in the truss are consistent, improving the box joint matching of the members. Since the inner arc side is the bending side, the intersection point of the system lines drawn using laser scribing has high precision. Using a high-precision re-pointing tool (reverse hole fixture), the outer arc side is re-pointed through the inner side, ensuring high precision and guaranteeing that the hole groups on both sides are parallel and concentric. The drilling and marking method for curved steel trusses of the present invention can avoid drilling position deviations caused by bending arcs compared with the prior art. Moreover, this process not only improves work efficiency, but also ensures the accuracy and quality of the product.

[0012] Optionally, the step of installing a reverse-hole tooling at the end of the chord structure, positioning the hole group on the outer web unit using the reverse-hole tooling, and completing the outer drilling of the chord structure using the hole group on the outer web unit includes:

[0013] After the accuracy of the inner hole group is qualified, the reverse hole fixture is installed at the end of the chord structure. The reverse hole fixture includes a fixed clamping plate, a pin, and a sliding clamping plate for sliding connection on the pin. The fixed clamping plate has a U-shaped cross-section and includes two side plates arranged opposite to each other. The two side plates are coaxially provided with round holes that are adapted to the hole group on the inner web unit.

[0014] One of the side plates of the fixing plate is fitted with the hole group surface on the inner web plate unit, while ensuring that the positioning reference line on it coincides with the plate unit assembly system line on the inner web plate unit;

[0015] The pin passes through the holes on the two side plates and the inner web unit of the fixing plate, and the intersection of the pin on the outer web unit is the location of the holes on the outer web unit.

[0016] Optionally, the step of installing a reverse-hole tool at the end of the chord structure, positioning the hole group on the outer web unit using the reverse-hole tool, and completing the outer drilling of the chord structure using the hole group on the outer web unit further includes:

[0017] After determining the position of the hole group on the outer web plate unit by means of the pin, move the sliding plate to make it fit against the outer web plate unit;

[0018] The sliding plate is fixed to the outer web unit using a fixing tool. At this time, the sliding plate serves as a temporary drilling template for the outer web unit.

[0019] The pin is pulled out, and the drilling task at the intersection of the pin and the outer web unit is completed by the sliding plate.

[0020] Optionally, the fixing tool includes a magnet block, and the sliding plate has a groove. The magnet block is used to be disposed in the groove to attract and fix the sliding plate to the outer web plate unit.

[0021] Optionally, the fixing tool further includes a welding device. After the sliding plate and the outer web unit are fixed by adsorption of the magnet, the sliding plate is spot-welded to the outer web unit by the welding device.

[0022] Optionally, the step of installing a reverse-hole tool at the end of the chord structure, positioning the hole group on the outer web unit using the reverse-hole tool, and completing the outer drilling of the chord structure on both sides using the hole group position on the outer web unit further includes:

[0023] After drilling the pin at the intersection point on the outer web unit is completed, the sliding plate is removed from the outer web unit.

[0024] Drill pins are driven into the drilling positions on the outer web plate unit, and the drilling template on the outer web plate unit is positioned and installed according to the position of the drill pins.

[0025] After the drilling template on the outer web unit is fixed, the drilling operation is carried out to complete the drilling task on both sides of the chord structure.

[0026] Optionally, after the assembly and bending of the plate unit according to the assembly system line and the bending system line to form a complete chord structure, the drilling and marking method of the curved steel truss beam further includes:

[0027] Place the chord structure on the drilling and marking platform with the inner web unit facing upwards.

[0028] Optionally, the inner web plate unit includes a vertical plate section, a stiffening rib is provided on the first surface of the vertical plate section, the plate unit assembly system line is drawn on the second surface of the vertical plate section opposite to the first surface, and the plate unit assembly system line is located within the projection range of the stiffening rib on the second end surface.

[0029] Optionally, the inner web unit further includes a node plate connected to one end of the straight section of the vertical plate, and the bending system line is drawn along the symmetrical center line of the node plate.

[0030] Optionally, the bending system line extends in a first direction, and the plate unit assembly system line extends in a second direction. The first direction is perpendicular to the second direction, and the plate unit assembly system line is used to intersect with the bending system line. Attached Figure Description

[0031] Figure 1 This is a flowchart of the drilling and marking method for curved steel truss beams according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the reverse hole tooling installed on the chord structure according to an embodiment of the present invention;

[0033] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0034] Figure 4 This is a schematic diagram of the structure of the fixing plate according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the chord structure according to an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Inner web plate unit; 11. Vertical plate straight section; 111. Stiffening rib; 12. Node plate; 2. Reverse hole tooling; 21. Fixed clamping plate; 211. Side plate; 22. Pin shaft; 23. Sliding clamping plate; 231. Groove; 3. Outer web plate unit; 4. Plate unit assembly system line; 5. Bending system line. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] In the description of this invention, the orientations or positional relationships indicated by terms such as "up," "down," "left," "right," "top," "bottom," "front," "back," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this invention. They are not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] In the description of this specification, references to terms such as "embodiment," "one embodiment," and "one implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0042] Furthermore, in the attached diagram, the Z-axis represents the vertical direction, that is, the up-down position, and the positive direction of the Z-axis (that is, the direction the arrow points to) represents up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents down; in the attached diagram, the X-axis represents the horizontal direction, that is, the left-right position, and the positive direction of the X-axis (that is, the direction the arrow points to) represents right, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents left; in the attached diagram, the Y-axis represents the vertical direction, that is, the front-back position, and the positive direction of the Y-axis (that is, the direction the arrow points to) represents front, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents back.

[0043] It should also be noted that the meanings of the aforementioned Z-axis, X-axis and Y-axis are only for the convenience of describing the present invention and simplifying the description, and are not intended to 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 present invention.

[0044] like Figures 1 to 4 As shown, the drilling and marking method for curved steel truss beams according to an embodiment of the present invention includes:

[0045] Step S1: In the steel plate parts cutting stage, laser scribing process is used to draw the plate unit assembly system line 4 on the inner web unit 1 of the chord and the bending system line 5 on the inner arc side of the bend.

[0046] Step S2: Weld and bend the plate unit assembly system line 4 and the bending system line 5 to form a complete chord structure. At the same time, find the intersection of the plate unit assembly system line 4 and the bending system line 5 on the chord structure. The intersection is used as the drilling template reference point.

[0047] Step S3: Based on the CAD unfolding layout data, confirm the distance from each hole group of the inner web unit 1 to the reference point and use this as a reference to set up the drilling template, and complete the drilling of the inner web of the chord structure through the drilling template.

[0048] Step S4: Install the reverse hole tool 2 at the end of the chord structure, and use the reverse hole tool 2 to locate the hole group position on the outer web unit 3, and complete the drilling of the outer web of the chord structure through the hole group position on the outer web unit 3.

[0049] In this embodiment, in conjunction with the appendix Figures 1 to 4 As shown, during the steel plate part cutting stage, laser scribing is used to draw the plate unit assembly system line 4 on the inner web unit 1 of the chord member, and the bending system line 5 on the inner arc side of the bend. Subsequently, welding and bending are performed based on the system lines to form a complete chord member structure. The plate unit assembly system line 4 and bending system line 5 drawn using the laser scribing method have high precision, and the scribing marks are not easily lost after the members are welded together. Due to the high precision of the inner arc side reference point, by using CAD unfolding data as a reference and the geometric relationship between the chord member end hole group and the system line, the measurement and control reference of all member hole groups in the truss can be kept consistent, improving the box joint matching of the members. Since the inner arc side is the bending side, the intersection point of the system line drawn by laser scribing has high precision. Using a high-precision return point tool (reverse hole fixture), the outer arc side is returned through the inner side with high precision, ensuring that the inner and outer hole groups are parallel and concentric. The drilling and marking method for curved steel trusses of the present invention can avoid drilling position deviations caused by bending arcs compared with the prior art. Moreover, this process not only improves work efficiency, but also ensures the accuracy and quality of the product.

[0050] In the above-described working process, in step S1, combined with the attached Figure 2 and attached Figure 4 As shown, after the parts are cut, laser scribing of the plate unit assembly system line 4 and bending system line 5 can be completed on the inner web unit 1 of the chord according to the CNC program. In step S2, combined with the attached... Figure 2 Or attached Figure 4 As shown, taking the plate unit assembly system line 4 and bending system line 5 on the inner web plate unit 1 as the reference, the bending of the parts and the prefabrication of the plate units and the assembly of the rods are completed. After welding, the plate unit assembly system line 4 and bending system line 5 are found on the rods as the reference points for drilling and mold setting.

[0051] Optionally, the step of installing a reverse-hole tool 2 at the end of the chord structure, positioning the hole group on the outer web unit 3 using the reverse-hole tool 2, and completing the outer drilling of the chord structure using the hole group on the outer web unit 3 includes:

[0052] After the accuracy of the inner hole group is qualified, the reverse hole fixture 2 is installed at the end of the chord structure. The reverse hole fixture 2 includes a fixed clamping plate 21, a pin 22, and a sliding clamping plate 23 for sliding connection to the pin 22. The fixed clamping plate 21 has a U-shaped cross section and includes two side plates 211 arranged opposite to each other. The two side plates 211 are coaxially provided with round holes that are adapted to the hole group on the inner web unit 1.

[0053] One of the side plates 211 of the fixing plate 21 is fitted with the hole group surface on the inner web plate unit 1, while ensuring that the positioning reference line on it coincides with the plate unit assembly system line 4 on the inner web plate unit 1.

[0054] The pin 22 passes through the holes on the two side plates 211 of the fixing plate 21 and the inner web unit 1. The intersection of the pin 22 on the outer web unit 3 is the location of the holes on the outer web unit 3.

[0055] In this embodiment, in conjunction with the appendix Figure 2 To be continued Figure 4 As shown, after the single-sided hole group accuracy test is qualified, the reverse hole fixture 2 is installed. The reverse hole fixture 2 includes a fixed clamping plate 21, a pin 22, and a sliding clamping plate 23. The fixed clamping plate 21 has a U-shaped cross-section. Specifically, the fixed clamping plate 21 can be a groove-shaped structure with an inner 100mm groove. The two side plates 211 are provided with round holes that match the hole group on the inner web plate unit 1. That is, the round holes on the side plates 21 have the same diameter as the hole group on the inner web plate unit 1. In use, one of the side plates 211 of the fixed clamping plate 21 is aligned with the hole group on the inner web plate unit 1. The surfaces are fitted together, and the positioning reference line on it coincides with the system line drawn on the inner web unit 1. The pin 22 is used to pass through the round holes on the two side plates 211 and the drilled hole on the inner web unit 1. Based on three points (i.e., the two round holes on the two side plates 211 are coaxial, and the drilled hole on the inner web unit 1 is coaxial with the round holes on the side plates 211), a straight line is determined. Then, according to the structural feature that the hole group at the end of the chord is concentric and located on the plane of the system line axis, the intersection of the positioning pin 22 on the outer web unit 3 on the other side is the theoretical hole group position.

[0056] Optionally, the step of installing a reverse-hole tool 2 at the end of the chord structure, positioning the hole group on the outer web unit 3 using the reverse-hole tool 2, and completing the outer drilling of the chord structure using the hole group on the outer web unit 3, further includes:

[0057] After the position of the hole group on the outer web plate unit 3 is determined by the pin 22, the sliding plate 23 is moved to fit against the outer web plate unit 3.

[0058] The sliding plate 23 is fixed to the outer web unit 3 using a fixing tool. At this time, the sliding plate 23 serves as a temporary drilling template for the outer web unit 3.

[0059] The pin 22 is pulled out, and the drilling task at the intersection of the pin 22 and the outer web unit 3 is completed by the sliding plate 23.

[0060] In this embodiment, in conjunction with the appendix Figure 2 As shown, after determining the position of the hole group on the outer web unit 3 using the pin 22, the sliding clamp 23 is moved to fit against the outer web unit 3. The sliding clamp 23 is then fixed to the outer web unit 3 using a fixing tool. At this time, the sliding clamp 23 can serve as a temporary drilling template for the outer web unit 3. The pin 22 is then removed, and the drilling task at the intersection of the pin 22 and the outer web unit 3 is completed using the sliding clamp 23. It should be noted that, in conjunction with the attached... Figure 2 As shown, the four corners of the two side plates 211 of the fixed plate 21 can each be provided with a matching diameter circular hole. Therefore, by sliding the plate 23 and using the four pins 22, the drilling of four holes can be completed on the outer web unit 3. It should be noted that the circular holes on the side plates 211 can be pre-drilled based on the hole spacing and diameter of the circular holes on the drilling template.

[0061] Optionally, the fixing tool includes a magnet block, and the sliding plate 23 has a groove 231. The magnet block is used to be disposed in the groove 231 to attract and fix the sliding plate 23 to the outer web unit 3.

[0062] In this embodiment, in conjunction with the appendix Figure 2 As shown, the sliding plate 23 has a groove 231. The wall thickness of the groove 231 is relatively thin, and it can be fixed by magnetic block to the outer web plate unit 3. Its main function is to prevent the sliding plate 23 from tilting up.

[0063] Optionally, the fixing tool further includes a welding device. After the sliding plate 23 and the outer web unit 3 are fixed by adsorption of the magnet, the sliding plate 23 is spot welded to the outer web unit 3 by the welding device.

[0064] In this embodiment, in conjunction with the appendix Figure 2 As shown, the sliding plate 23 is closer to the outside (attached). Figure 2 The outer web plate unit 3 (in the opposite direction of the X-axis) can be fixed to the outer web plate unit 3 by spot welding using welding equipment.

[0065] Optionally, the step of installing a reverse-hole tool 2 at the end of the chord structure, positioning the hole group on the outer web unit 3 using the reverse-hole tool 2, and completing the outer drilling of the chord structure using the hole group on the outer web unit 3, further includes:

[0066] After the drilling of the pin 22 at the intersection with the outer web unit 3 is completed, the sliding plate 23 is removed from the outer web unit 3.

[0067] Drill pins are driven into the drilling positions on the outer web plate unit 3, and the drilling template on the outer web plate unit 3 is positioned and installed according to the position of the drill pins.

[0068] After the drilling template on the outer web unit 3 is fixed, the drilling operation is carried out to complete the drilling task on both sides of the chord structure.

[0069] In this embodiment, after drilling the pin 22 at the intersection with the outer web unit 3, the sliding clamp 23 is removed from the outer web unit 3. A punch is driven into the drilling location, and a drilling template is installed on the outer web unit 3 according to the position of the punch. After fixing, drilling is performed, and spot weld marks are removed by grinding or by cutting the excess material, completing the drilling task on both sides of the curved steel truss (chord structure). It should be noted that, for example, four positioning holes are first drilled on the outer web unit 3 using the sliding clamp 23. Then, based on the four positioning holes, a drilling template is installed on the outer web unit 3, thereby completing the drilling of the remaining holes using the drilling template. Thus, the drilling work on the outer web unit 3 is completed by the sliding clamp 23 and the drilling template working together.

[0070] Optionally, after the assembly and bending of the plate unit assembly system line 4 and the bending system line 5 are performed to form the completed chord structure, the drilling and marking method for the truss bending node plate 12 further includes:

[0071] The chord structure is placed on the drilling and marking platform with the inner web unit 1 facing upwards.

[0072] Optionally, the inner web plate unit 1 includes a vertical plate straight section 11, the first surface of the vertical plate straight section 11 is provided with a stiffening rib 111, the plate unit assembly system line 4 is drawn on the second surface of the vertical plate straight section 11 away from the first surface, and the plate unit assembly system line 4 is located within the projection range of the stiffening rib 111 on the second end surface.

[0073] In this embodiment, in conjunction with the appendix Figure 2 and attached Figure 4 As shown, the first surface of the vertical section 11 (the surface of the inner web unit 1 facing the outer web unit 3, attached) Figure 2Stiffening ribs 111 are provided on the positive Y-axis direction. The plate unit assembly system line 4 is drawn on the second surface of the vertical plate segment 11 away from the first surface (the surface of the inner web unit 1 away from the outer web unit 3). Figure 2 (in the opposite direction of the Y-axis), and the unit assembly system line 4 is located within the projection range of the stiffening rib 111 on the second end face. It can be understood that the plate unit assembly system line 4 can be laser-scribed based on the position of the stiffening rib 111, that is, the plate unit assembly system line 4 is drawn along the length direction of the stiffening rib 111.

[0074] Optionally, the inner web unit 1 further includes a node plate 12 connected to one end of the vertical section 11, and the bending system line 5 is drawn along the symmetrical center line of the node plate 12.

[0075] In this embodiment, in conjunction with the appendix Figure 2 and attached Figure 4 As shown, the inner web unit 1 also includes a node plate 12 that is connected to one end of the vertical plate straight section 11, wherein the bending system line 5 is drawn along the symmetrical center line of the node plate 12.

[0076] Optionally, the bending system line 5 extends in a first direction, and the plate unit assembly system line 4 extends in a second direction. The first direction is perpendicular to the second direction, and the plate unit assembly system line 4 is used to intersect with the bending system line 5.

[0077] In this embodiment, in conjunction with the appendix Figure 2 and attached Figure 4 As shown, the first direction is the attached direction. Figure 2 The second direction is the Z-axis direction. Figure 2 In the X-axis direction, the first direction is perpendicular to the second direction, and the plate unit assembly system line 4 can intersect with the bending system line 5.

[0078] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0079] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for drilling and marking holes in a curved steel truss girder, characterized in that, include: During the steel plate parts cutting stage, laser scribing process is used to draw the plate unit assembly system line (4) on the inner web unit (1) of the chord and the bending system line (5) on the inner arc side of the bend. Welding and bending are performed according to the plate unit assembly system line (4) and the bending system line (5) to form a complete chord structure. At the same time, the intersection of the plate unit assembly system line (4) and the bending system line (5) is found on the chord structure, and the intersection is used as the drilling template reference point. Based on the CAD unfolding and layout data, the distance from each hole group of the inner web unit (1) to the reference point is confirmed, and the drilling template is set up based on this. The drilling of the inner web of the chord structure is completed through the drilling template. Install a reverse hole tool (2) at the end of the chord structure, and use the reverse hole tool (2) to locate the hole group position on the outer web unit (3), and complete the drilling of the outer web of the chord structure through the hole group position on the outer web unit (3); The process of installing a reverse-hole tooling (2) at the end of the chord structure, positioning the hole group on the outer web unit (3) using the reverse-hole tooling (2), and completing the outer drilling of the chord structure using the hole group on the outer web unit (3) includes: After the accuracy of the inner hole group is qualified, the reverse hole fixture (2) is installed at the end of the chord structure. The reverse hole fixture (2) includes a fixed clamping plate (21), a pin (22) and a sliding clamping plate (23) for sliding connection to the pin (22). The fixed clamping plate (21) has a U-shaped cross section and includes two side plates (211) arranged opposite to each other. The two side plates (211) are coaxially provided with round holes that are compatible with the hole group on the inner web unit (1). One of the side plates (211) of the fixed plate (21) is fitted with the hole group surface on the inner web plate unit (1), while ensuring that the positioning reference line on it coincides with the plate unit assembly system line (4) on the inner web plate unit (1); The pin (22) passes through the holes on the two side plates (211) of the fixed plate (21) and the inner web unit (1). The intersection of the pin (22) on the outer web unit (3) is the location of the holes on the outer web unit (3).

2. The drilling and marking method for curved steel truss beams according to claim 1, characterized in that, The method of installing a reverse hole tool (2) at the end of the chord structure, positioning the hole group position on the outer web unit (3) through the reverse hole tool (2), and completing the outer drilling of the chord structure through the hole group position on the outer web unit (3) further includes: After the position of the hole group on the outer web plate unit (3) is determined by the pin (22), the sliding plate (23) is moved to fit against the outer web plate unit (3); The sliding plate (23) is fixed on the outer web unit (3) using a fixing tool. At this time, the sliding plate (23) serves as a temporary drilling template for the outer web unit (3). Pull out the pin (22) and complete the drilling task at the intersection of the pin (22) on the outer web unit (3) by the sliding plate (23).

3. The drilling and marking method for curved steel truss beams according to claim 2, characterized in that, The fixing tool includes a magnet block, and the sliding plate (23) has a groove (231) for setting in the groove (231) to attract and fix the sliding plate (23) to the outer web unit (3).

4. The drilling and marking method for curved steel truss beams according to claim 3, characterized in that, The fixing tool also includes a welding device. After the sliding plate (23) and the outer web unit (3) are fixed by adsorption of the magnet, the sliding plate (23) is spot welded to the outer web unit (3) by the welding device.

5. The drilling and marking method for curved steel truss beams according to claim 2, characterized in that, The method of installing a reverse hole tool (2) at the end of the chord structure, positioning the hole group position on the outer web unit (3) through the reverse hole tool (2), and completing the outer drilling of the chord structure through the hole group position on the outer web unit (3) further includes: After the drilling of the pin (22) at the intersection on the outer web unit (3) is completed, the sliding plate (23) is removed from the outer web unit (3); Drill pins are driven into the drilling positions on the outer web plate unit (3), and the drilling template on the outer web plate unit (3) is positioned and installed according to the position of the drill pins; After the drilling template on the outer web unit (3) is fixed, the drilling operation is carried out to complete the drilling task on both sides of the chord structure.

6. The drilling and marking method for curved steel truss beams according to claim 1, characterized in that, After the assembly and bending of the plate unit assembly system line (4) and the bending system line (5) are performed to form a complete chord structure, the drilling and marking method of the truss bending node plate (12) further includes: The chord structure is placed on the drilling and marking platform with the inner web unit (1) facing upwards.

7. The drilling and marking method for curved steel truss beams according to claim 1, characterized in that, The inner web plate unit (1) includes a vertical plate straight section (11), and a stiffening rib (111) is provided on the first surface of the vertical plate straight section (11). The plate unit assembly system line (4) is drawn on the second surface of the vertical plate straight section (11) away from the first surface, and the plate unit assembly system line (4) is located within the projection range of the stiffening rib (111) on the second surface.

8. The drilling and marking method for curved steel truss beams according to claim 7, characterized in that, The inner web unit (1) also includes a node plate (12) that is connected to one end of the vertical plate straight section (11), and the bending system line (5) is drawn along the symmetrical center line of the node plate (12).

9. The drilling and marking method for curved steel truss beams according to claim 8, characterized in that, The bending system line (5) extends in a first direction, and the plate unit assembly system line (4) extends in a second direction. The first direction is perpendicular to the second direction, and the plate unit assembly system line (4) is used to intersect with the bending system line (5).

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