A non-welded, detachable reinforcement structure for the web of a steel channel beam bridge and its installation method.

Abstract

This invention discloses a non-welded, detachable reinforcing structure for the web of a steel channel beam bridge and its installation method, comprising a reinforcing plate; the reinforcing plate is welded to the diaphragm of the steel channel beam bridge; the reinforcing plate is connected to the web of the steel channel beam bridge via a fastening assembly; a removable rigid gasket is also provided between the reinforcing plate and the web to fill the gap between the reinforcing plate and the web to achieve surface contact force transmission. This invention achieves reliable force transmission from the reinforcing plate and allows for non-destructive removal after use, avoiding damage to the main structure.

Description

Technical Field

[0001] This invention relates to the manufacturing technology of steel channel beam bridges, and more specifically, to a non-welded detachable reinforcing structure for the web of a steel channel beam bridge and its installation method. Background Technology

[0002] Steel channel girder bridges exhibit spatial curves, requiring additional temporary supports and lateral connections on the outer side of the web during bridge erection. These temporary supports are only used during the bridge erection phase and are removed after the bridge site installation is complete. Due to the relatively thin web, the installation load of the temporary structures on the outer side can easily cause local out-of-plane deformation of the web, thus affecting the internal force distribution and long-term durability of the completed bridge.

[0003] To reduce the aforementioned deformation, existing technologies typically add reinforcing plates to the inner side of the web to improve local stiffness. Patent publication CN105256727B discloses a transverse reinforcement device for a corrugated steel web composite beam. This device fixes a flat steel plate to the inner side of the corrugated steel web and directly connects the web to the steel plate using double-ended studs and hexagonal nuts, thereby improving web stiffness without welding stiffening ribs. However, in this solution, the reinforcing plate and web are directly and rigidly connected via studs, resulting in a direct force transmission path of "web → stud → steel plate." Furthermore, the reinforcing plate is a permanent structure, and its removal after temporary use is not considered; therefore, the protection of the web substrate during reinforcement plate removal is not taken into account. Moreover, this solution is not applicable to situations where temporary reinforcement structures need to be removed after bridge erection.

[0004] In summary, the existing temporary reinforcement schemes for bridge construction still have the following unresolved technical challenges:

[0005] (1) If the plate is welded to the web, the welding heat input will easily cause further thermal deformation of the web, and the weld area will become a fatigue-sensitive area.

[0006] (2) If the plate is only attached to the web without welding, the initial unevenness of the web after manufacturing and welding (usually 1~3mm) makes it difficult for the plate and the web to maintain a tight fit throughout the entire service life, and the temporary load transmission path is unclear.

[0007] (3) The temporary structure needs to be dismantled after use. During the cutting process, the web base material is easily damaged, and the weld marks and cutting marks are difficult to completely eliminate, causing irreversible damage to the main structure.

[0008] The aforementioned problems are particularly prominent in the temporary reinforcement construction of spatial curved steel trough beam bridges. Summary of the Invention

[0009] To address the shortcomings of existing technologies, the purpose of this invention is to provide a non-welded, detachable reinforcing structure and its installation method suitable for the web of steel channel beam bridges. This structure can reliably transmit force through the reinforcing plate and can be removed without damage after use, thus avoiding damage to the main structure.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] The first aspect of the present invention provides a non-welded detachable reinforcement structure for the web of a steel channel beam bridge, including a reinforcing plate;

[0012] The reinforcing plate is welded to the diaphragm of the steel trough beam bridge;

[0013] The reinforcing plate is connected to the web of the steel trough beam bridge by a fastening assembly;

[0014] A removable rigid gasket is also provided between the reinforcing plate and the web plate to fill the gap between the reinforcing plate and the web plate to achieve surface contact force transmission.

[0015] Preferably, the rigid gasket is made of stainless steel and has a U-shaped opening structure.

[0016] Preferably, the position of the U-shaped opening structure corresponds to the fastening component, and the size is 8~12mm.

[0017] Preferably, the fastening assembly includes process bolts and nuts.

[0018] Preferably, the outer side of the reinforcing plate is provided with a nut groove plate;

[0019] The nut slot plate is provided with a nut receiving groove that is concentric with the process bolt.

[0020] Preferably, the non-welded detachable reinforcing structure further includes transverse stiffening plates;

[0021] The transverse stiffening rib is located on the outside of the reinforcing plate and is welded to the partition.

[0022] Preferably, sealant is provided around the perimeter of the reinforcing plate and the web plate;

[0023] The sealant is a weather-resistant polyurethane or silicone sealant with a layer thickness of 2-5 mm.

[0024] The second aspect of the present invention provides an installation method for a non-welded detachable reinforcing structure on the web of a steel channel beam bridge as described in the first aspect of the present invention. The reinforcing plate is welded to the partition plate, the reinforcing plate and the web are tightened and fitted together by the fastening assembly, and a removable rigid gasket is provided between the reinforcing plate and the web to fill the gap between the reinforcing plate and the web to achieve surface contact force transmission.

[0025] The nut slot plate is provided on the outer side of the reinforcing plate to facilitate the fastening operation of the fastening assembly from the outside. The nut receiving groove on the nut slot plate is set to be concentric with the process bolt in the fastening assembly.

[0026] The transverse stiffening rib is provided on the outside of the reinforcing plate, and the transverse stiffening rib is welded to the partition to suppress welding deformation;

[0027] The sealant is applied around the perimeter of the gap between the reinforcing plate and the web plate to completely seal the gap entrance, isolate air and moisture, and prevent corrosion inside the gap.

[0028] Preferably, when the reinforcing plate and the partition are welded, a magnetic clamping rod is used to press the reinforcing plate tightly against the inner side of the web plate;

[0029] The magnetic clamping rod includes a powerful magnet, a clamping plate, a clamping bolt, and a clamping nut.

[0030] The clamping plates are symmetrically arranged on the powerful magnets in pairs, and the clamping nuts are located between the two clamping plates. In use, the magnetic clamping rod is attracted to the outer side of the web plate, the powerful magnets provide the attraction force, and the clamping bolts are tightened to make the clamping plates press against the outer surface of the reinforcing plate, thereby pressing the reinforcing plate against the web plate.

[0031] Preferably, the process flow for matching the process bolt holes on the reinforcing plate is as follows:

[0032] Step S1: All the process bolt holes on the reinforcing plate are first machined according to the design drawings;

[0033] Step S2: Assemble the reinforcing plate onto the inner side of the web plate according to the drawings, and temporarily fix it to the partition plate by spot welding;

[0034] Step S3: According to the hole positions on the already positioned reinforcing plate, mark the center position of the hole to the outside of the web; first, use a 3-5mm diameter drill bit to drill a positioning hole from the inside of the web, and after confirming that the hole center is correct, use a magnetic drill to drill to the designed hole diameter from the outside of the web.

[0035] Step S4: Remove the reinforcing plate and deburr and clean the iron filings from the holes drilled on the web plate.

[0036] Step S5: Reassemble the reinforcing plate according to the drawing, insert the process bolts for connection and fixation, measure the gap between the reinforcing plate and the web plate. If the gap is ≤2mm, directly tighten the process bolts to the design preload. If the gap exceeds 2mm, insert the rigid shims of the corresponding thickness to fill the gap before tightening.

[0037] Step S6: Weld the transverse stiffening plate and the weld between the reinforcing plate and the partition plate;

[0038] Step S7: After the calibration is completed, remove the process bolts;

[0039] For the case where the outer side of the reinforcing plate is provided with a nut groove plate, the nut groove plate is processed first, and when welding it to the reinforcing plate, a positioning bolt is used to temporarily fix it through the groove of the nut groove plate and the bolt hole of the reinforcing plate, ensuring that the center of the groove and the center of the bolt hole are concentric before welding.

[0040] The present invention provides a non-welded, detachable reinforcing structure for the web of a steel channel beam bridge and its installation method, which has the following advantages:

[0041] (1) Avoid damage to the base material: Since no welding is performed between the reinforcing plate and the web, they are only attached by mechanical tightening of bolts. With the help of removable stainless steel shims to compensate for the gap, when the temporary structure is dismantled, only the bolts need to be loosened, the shims removed, and the outer plate cut off. The whole process does not involve thermal cutting or mechanical damage to the web base material. As verified by the example, after dismantling, there are no weld residues, no cutting marks, and no local hardened areas on the surface of the web. The surface roughness of the base material is kept as is, eliminating the additional welds and the fatigue sources they cause from the root, and significantly improving the long-term service life of the bridge. Reliable force transmission: The normal clamping force is provided by tightening the bolts, and the surface contact force transmission is achieved by filling the gap with rigid shims. The temporary load is effectively transmitted through the path of plate → shim / bolt → web. The force transmission path is clear and the force is reliable, avoiding the uncertainty of force transmission caused by simply attaching without welding.

[0042] (2) Reliable force transmission: The normal clamping force (design preload 80kN) is provided by tightening the bolts, and the surface contact force transmission is achieved by filling the gap with rigid shims. The temporary load is effectively transmitted through the path of "plate → shim / bolt → web". According to actual measurement, the maximum gap between the plate and the web after the plate is attached is ≤1.5mm, which is much smaller than the gap (3~5mm) of the only attachment without welding scheme. The force transmission path is clear and the force is reliable.

[0043] (3) Controllable welding quality: The outer stiffness of the plate is increased by transverse stiffening plates, and the magnetic clamping rod continuously provides clamping force (about 50 kg) during the welding process, effectively controlling the warping deformation of the plate caused by welding heat input. Verification by the example shows that the outer deformation of the plate after welding is ≤1.2 mm, while the deformation of the traditional non-clamping welding scheme is 4~6 mm, reducing the deformation by 70%~80%.

[0044] (4) Excellent anti-corrosion performance: The sealant continuously fills the gap around the perimeter, effectively isolating external moisture and corrosive media, preventing internal gap corrosion, and the sealant does not damage the base material when it is removed, thus solving the technical problem of not being able to coat narrow gaps.

[0045] (5) Strong adaptability: Through the design of the outer nut slot and the reverse installation strategy, it can be applied to complex working conditions such as limited bolt tightening and insufficient assembly space, and has a wide range of engineering applicability. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the diaphragm and web.

[0047] Figure 2 This is a schematic diagram of the non-welded detachable reinforcing structure of the present invention;

[0048] Figure 3 This is a schematic diagram of the rigid pad in the non-welded detachable reinforcing structure of the present invention;

[0049] Figure 4 This is a schematic diagram of the installation method of the non-welded detachable reinforcing structure of the present invention;

[0050] Figure 5 This is a schematic diagram of the magnetic clamping rod in the installation method of the non-welded detachable reinforcing structure of the present invention. Detailed Implementation

[0051] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0052] Combination Figure 1 and Figure 2 As shown, the present invention provides a non-welded detachable reinforcement structure suitable for the web of a steel channel beam bridge, including a reinforcing plate 1.

[0053] The reinforcing plate 1 is welded to the diaphragm 2 of the steel channel beam bridge, and there is no welded connection between it and the web plate 3.

[0054] The reinforcing plate 1 is connected to the web plate 3 of the steel channel beam bridge by fastening components (process bolts and nuts).

[0055] A removable rigid gasket 4 is also provided between the reinforcing plate 1 and the web plate 3 to fill the gap between the reinforcing plate 1 and the web plate 3 to achieve surface contact force transmission.

[0056] When the reinforcing plate 1 is removed, after the rigid gasket 4 is pulled out, the reinforcing plate 1 and the web plate 3 are completely separated, and the temporary structure is cut off without damaging the web plate base material.

[0057] Compared to existing technologies (such as CN105256727B), where the reinforcing plate is directly and rigidly connected to the web plate via double-ended studs, forming a permanent structure, the force transmission path is a direct force transmission mode of "web plate → studs → reinforcing plate". In contrast, the reinforcing plate 1 of this invention is only welded to the partition plate 2, without any welding or screwing between it and the web plate 3. It achieves indirect surface contact force transmission through tightening of fastening components and filling of gaps with removable rigid gaskets 4, resulting in an indirect force transmission mode of "plate → gasket / bolt → web plate". Furthermore, the rigid gasket 4 is removable, and the plate can be completely detached, achieving the technical effect of temporary use and non-destructive removal. The connection method, force transmission path, and technical effect of the two technologies are substantially different.

[0058] The reinforcing plate 1 and the web plate 3 are tightened together by fastening components to achieve a tight fit and force transmission. To address the warping deformation and initial unevenness of the web plate that occur during welding, a gap compensation scheme is adopted: a removable rigid shim 4 is inserted into the gap between the reinforcing plate 1 and the web plate 3.

[0059] Combination Figure 3 As shown, the rigid gasket 4 is made of stainless steel and has a U-shaped opening structure 401. The position of the U-shaped opening structure 401 corresponds to the fastening component, and the size is 8~12mm (preferably 10mm). This facilitates installation and removal without avoiding the bolt hole position, ensuring effective force transmission.

[0060] For areas with limited space for bolt tightening (such as confined internal spaces), a nut slot plate 101 is provided on the outer surface of the reinforcing plate 1. The nut slot plate 101 has a nut receiving groove 102 that is concentric with the process bolt, facilitating bolt tightening operations from the outside of the web plate 3 and ensuring reliable tightening in all areas. Before welding the nut slot plate 101 to the reinforcing plate 1, a positioning bolt is used to temporarily fix it through the groove of the nut receiving groove 102 and the bolt hole on the reinforcing plate 1, ensuring that the concentricity between the center of the groove and the center of the bolt hole is ≤1mm.

[0061] The reinforcing plate 1 is not welded to the web plate 3, but only to the partition plate 2. At the same time, a transverse stiffening plate 5 is provided on the outer side of the reinforcing plate 1. The transverse stiffening plate 5 is also welded to the partition plate 2. The welding deformation is suppressed by increasing the outer stiffness of the reinforcing plate 1.

[0062] When reinforcing plate 1 is welded to partition plate 2, a magnetic clamping rod is used to press reinforcing plate 1 firmly against the inner side of web plate 3. Figure 5 As shown, the magnetic clamping rod includes a powerful magnet 11, a clamping plate 12, a clamping bolt 13, and a clamping nut 14. The clamping plates 12 are symmetrically arranged on the powerful magnets 11 in pairs, and the clamping nuts 14 are arranged between the two clamping plates 12. In use, the magnetic clamping rod is attracted to the outer side of the web plate 3. The powerful magnets 11 provide the attraction force. Tightening the clamping bolts 13 causes the clamping plates 12 to press against the outer surface of the reinforcing plate 1, thereby pressing the plate against the web plate 3 and effectively controlling the expansion of the gap between the reinforcing plate 1 and the web plate 3 during the welding process.

[0063] The welding sequence of the transverse stiffening plate 5 is to weld symmetrically from the middle to both sides: first weld the transverse stiffening plate 5 located in the middle of the reinforcing plate 1, and after the welding is completed and the surface is ground flat, install and weld the transverse stiffening plates 5 on both sides.

[0064] Given the small gap between the reinforcing plate 1 and the web plate 3, sandblasting coating cannot be applied to the inner side. Therefore, sealant is continuously applied around the perimeter of the gap between the reinforcing plate 1 and the web plate 3. The sealant is a weather-resistant polyurethane or silicone sealant, with a thickness of 2-5 mm, completely sealing the gap entrance, isolating air and moisture, and preventing internal corrosion. This sealant can be removed during the temporary structure dismantling without damaging the base material. The sealant is applied after the reinforcing plate 1 and partition plate 2 have been welded and cooled to room temperature to avoid the high welding temperatures damaging the sealant's performance.

[0065] The present invention also provides an installation method for the non-welded detachable reinforcing structure of the present invention, wherein the reinforcing plate 1 and the partition plate 2 are welded together, the reinforcing plate 1 and the web plate 3 are tightened and attached by fastening components, and a removable rigid gasket 4 is provided between the reinforcing plate 1 and the web plate 3 to fill the gap between the reinforcing plate 1 and the web plate 3 to achieve surface contact force transmission.

[0066] A nut slot plate 101 is provided on the outer side of the reinforcing plate 1 to facilitate the fastening operation of the fastening assembly from the outside of the web plate 3. The nut receiving groove 102 on the nut slot plate 101 is set to be concentric with the process bolt in the fastening assembly.

[0067] A transverse stiffening plate 5 is provided on the outside of the reinforcing plate 1. The transverse stiffening plate 5 is welded to the partition plate 2 to suppress welding deformation.

[0068] Sealant is applied to the four-sided gap between the reinforcing plate 1 and the web plate 3 to completely seal the gap entrance, isolate air and moisture, and prevent internal corrosion of the gap.

[0069] When welding the reinforcing plate and the partition, a magnetic clamping rod is used to press the reinforcing plate firmly against the inside of the web plate;

[0070] The magnetic clamping rod includes a powerful magnet 11, a clamping plate 12, a clamping bolt 13, and a clamping nut 14. The clamping plates 12 are symmetrically arranged on the powerful magnets 11 in pairs, and the clamping nuts 14 are arranged between the two clamping plates 12. In use, the magnetic clamping rod is attracted to the outer side of the web plate 3. The powerful magnets 11 provide the attraction force. Tightening the clamping bolts 13 causes the clamping plates 12 to press against the outer surface of the reinforcing plate 1, thereby pressing the plate against the web plate 3 and effectively controlling the expansion of the gap between the reinforcing plate 1 and the web plate 3 during the welding process.

[0071] The reinforcing plate 1 also needs to be connected to the outer component; therefore, when installing the perforated reinforcing plate 1, the holes need to pass through the web plate 3. To eliminate the influence of welding deformation on the hole position accuracy, combined with... Figure 4 As shown, the process flow for matching the process bolt holes on the reinforcing plate 1 is as follows:

[0072] Step S1: First, all process bolt holes on the reinforcing plate 1 are machined according to the design drawings;

[0073] Step S2: Assemble the reinforcing plate 1 onto the inner side of the web plate 3 according to the drawings, and temporarily fix it to the partition plate 2 by spot welding;

[0074] Step S3: According to the hole positions on the already positioned reinforcing plate 1, mark the center position of the hole to the outside of the web plate 2; first, use a 3-5mm diameter drill bit to drill a positioning hole from the inside of the web plate. After confirming that the hole center is correct, use a magnetic drill to drill to the designed hole diameter from the outside of the web plate (because the internal space is small, it is not possible to use a magnetic drill to drill from the inside).

[0075] Step S4: Remove the reinforcing plate 1, and deburr and clean the iron filings from the holes drilled on the web plate 3.

[0076] Step S5: Reassemble the reinforcing plate 1 according to the drawing, insert the process bolts to connect and fix it, measure the gap between the reinforcing plate 1 and the web plate 3. If the gap is ≤2mm, directly tighten the process bolts to the design preload; if the gap is more than 2mm, insert rigid shims 4 of the corresponding thickness to fill it before tightening.

[0077] Step S6: Weld the transverse stiffening plates and the welds between the reinforcing plates and the partitions (the welding sequence is from the middle to both sides; after the middle stiffening plate is welded and ground, the stiffening plates on both sides are then installed).

[0078] Step S7: After the calibration is completed, remove the process bolts;

[0079] For the case where the outer side of the reinforcing plate 1 is provided with a nut groove plate 101, the nut groove plate 101 is processed first. When welding it to the reinforcing plate 1, a positioning bolt is used to temporarily fix it by passing through the groove of the nut groove plate 101 and the bolt hole of the reinforcing plate 1. Welding is then performed after ensuring that the center of the groove and the center of the bolt hole are concentric.

[0080] If, after the beam segment is formed (all welds on the web are completed), some areas cannot be directly assembled, a backward method is used to install stiffening plates and reinforcing plates: first install the components that are difficult to reach in subsequent processes (such as the stiffening plates at the deepest part of the web), and then install the remaining components from the inside out to ensure that all structures are correctly positioned.

[0081] The construction sequence for reinforcing plates is as follows: assemble and spot weld according to the drawings → drill holes → install reinforcing plates → weld stiffening plates → weld the reinforcing plates to the partitions → apply sealant to the gap between the reinforcing plates and the web. When installing and welding stiffening plates, the middle should be punched towards both sides. After the middle stiffening plate is welded and ground, the stiffening plates on both sides should be installed.

[0082] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A non-welded, detachable reinforcing structure for the web of a steel channel beam bridge, characterized in that: Including reinforced panels; The reinforcing plate is welded to the diaphragm of the steel trough beam bridge; The reinforcing plate is connected to the web of the steel trough beam bridge by a fastening assembly; A removable rigid gasket is also provided between the reinforcing plate and the web plate to fill the gap between the reinforcing plate and the web plate to achieve surface contact force transmission.

2. The non-welded detachable reinforcing structure for the web of a steel channel beam bridge according to claim 1, characterized in that: The rigid gasket is made of stainless steel and has a U-shaped opening structure.

3. The non-welded detachable reinforcing structure for the web of a steel channel beam bridge according to claim 2, characterized in that: The position of the U-shaped opening structure corresponds to the fastening component, and its size is 8~12mm.

4. The non-welded detachable reinforcing structure for the web of a steel channel beam bridge according to claim 1, characterized in that: The fastening components include process bolts and nuts.

5. The non-welded detachable reinforcing structure for the web of a steel channel beam bridge according to claim 4, characterized in that: The outer side of the reinforcing plate is provided with a nut groove plate; The nut slot plate is provided with a nut receiving groove that is concentric with the process bolt.

6. The non-welded detachable reinforcing structure for the web of a steel channel beam bridge according to claim 1, characterized in that: The non-welded detachable reinforcing structure also includes transverse stiffening plates; The transverse stiffening rib is located on the outside of the reinforcing plate and is welded to the partition.

7. The non-welded detachable reinforcing structure for the web of a steel channel beam bridge according to claim 1, characterized in that: Sealant is provided around the perimeter gap between the reinforcing plate and the web plate; The sealant is a weather-resistant polyurethane or silicone sealant with a layer thickness of 2-5 mm.

8. A method for installing a non-welded, detachable reinforcing structure on the web of a steel channel beam bridge as described in any one of claims 1-7, characterized in that: The reinforcing plate is welded to the partition plate, and the reinforcing plate and the web plate are tightened and attached by the fastening assembly. A removable rigid gasket is provided between the reinforcing plate and the web plate to fill the gap between the reinforcing plate and the web plate to achieve surface contact force transmission. The nut slot plate is provided on the outer side of the reinforcing plate to facilitate the fastening operation of the fastening assembly from the outside. The nut receiving groove on the nut slot plate is set to be concentric with the process bolt in the fastening assembly. The transverse stiffening rib is provided on the outside of the reinforcing plate, and the transverse stiffening rib is welded to the partition to suppress welding deformation; The sealant is applied around the perimeter of the gap between the reinforcing plate and the web plate to completely seal the gap entrance, isolate air and moisture, and prevent corrosion inside the gap.

9. The installation method of the non-welded detachable reinforcing structure on the web of a steel channel beam bridge according to claim 8, characterized in that: When the reinforcing plate and the partition are welded, a magnetic clamping rod is used to press the reinforcing plate firmly against the inside of the web plate; The magnetic clamping rod includes a powerful magnet, a clamping plate, a clamping bolt, and a clamping nut. The clamping plates are symmetrically arranged on the powerful magnets in pairs, and the clamping nuts are located between the two clamping plates. In use, the magnetic clamping rod is attracted to the outer side of the web plate, the powerful magnets provide the attraction force, and the clamping bolts are tightened to make the clamping plates press against the outer surface of the reinforcing plate, thereby pressing the reinforcing plate against the web plate.

10. The installation method of the non-welded detachable reinforcing structure on the web of a steel channel beam bridge according to claim 8, characterized in that, The hole-fitting process for the process bolt holes on the reinforcing plate is as follows: Step S1: All the process bolt holes on the reinforcing plate are first machined according to the design drawings; Step S2: Assemble the reinforcing plate onto the inner side of the web plate according to the drawing, and temporarily fix it to the partition plate by spot welding; Step S3: According to the hole positions on the already positioned reinforcing plate, mark the center position of the hole to the outside of the web; first, use a 3-5mm diameter drill bit to drill a positioning hole from the inside of the web, and after confirming that the hole center is correct, use a magnetic drill to drill to the designed hole diameter from the outside of the web. Step S4: Remove the reinforcing plate and deburr and clean the iron filings from the holes drilled on the web plate. Step S5: Reassemble the reinforcing plate according to the drawing, insert the process bolts for connection and fixation, measure the gap between the reinforcing plate and the web plate. If the gap is ≤2mm, directly tighten the process bolts to the design preload. If the gap exceeds 2mm, insert the rigid shims of the corresponding thickness to fill the gap before tightening. Step S6: Weld the transverse stiffening plate and the weld between the reinforcing plate and the partition plate; Step S7: After the calibration is completed, remove the process bolts; For the case where the outer side of the reinforcing plate is provided with a nut groove plate, the nut groove plate is processed first, and when welding it to the reinforcing plate, a positioning bolt is used to temporarily fix it through the groove of the nut groove plate and the bolt hole of the reinforcing plate, ensuring that the center of the groove and the center of the bolt hole are concentric before welding.

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