A welding process for inserting U-rib plates in orthogonal steel structure bridges

Abstract

This invention relates to a double-sided welding process for U-rib plates used in the construction of orthogonal steel structure bridges or the reinforcement of dangerous bridges. The process includes: welding the inner weld of the U-rib plate in the patch section using a small, dedicated U-rib welding robot via gas metal arc welding (GMAW); removing the welding wire feeder and the GMAW robot from the opening of the next adjacent patch section; cleaning the root of the outer weld of the patch section; welding the outer joint of the U-rib plate using GMAW; and using ultrasonic impact to impact the outer weld of the patch section to reduce welding tensile stress. This invention addresses the problem of double-sided welding of the inner and outer joints of the U-rib patch section in orthogonal steel structure bridges, offering both economic and social benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of U rib plate patching section welding process method of orthogonal steel structure bridge, specifically relates to a kind of U rib plate double-sided welding process method of patching section when building site or dangerous bridge reinforcement of orthogonal steel structure bridge. BACKGROUND

[0002] Longitudinal U rib orthogonal steel structure bridge is the main structure form of current large-span, heavy steel structure welded bridge, due to the restriction of existing technology, the fixing method of patching section U rib plate can only adopt steel gasket single-sided welding or bolted fixed mode.Patch section U rib plate is connected to steel bridge, the present application provides a kind of U rib plate welding process method of orthogonal steel structure bridge patching section, realizes the double-sided welding between patching section U rib plate and adjacent U rib and bridge deck, changes the geometric shape of connecting position between patching section U rib plate and adjacent U rib and bridge deck, greatly reduces the stress concentration coefficient of joint position, effectively improves the stress distribution state of patching section U rib plate welding joint position, provides an effective method for improving its fatigue life. SUMMARY

[0003] For the connection of patching section U rib plate of steel bridge, the present application provides a kind of U rib plate welding process method of orthogonal steel structure bridge patching section, realizes the double-sided welding between patching section U rib plate and adjacent U rib and bridge deck, changes the geometric shape of connecting position between patching section U rib plate and adjacent U rib and bridge deck, greatly reduces the stress concentration coefficient of joint position, effectively improves the stress distribution state of patching section U rib plate welding joint position, provides an effective method for improving its fatigue life.

[0004] To achieve the above object, the present application provides the following technical scheme: a kind of U rib plate welding process method of orthogonal steel structure bridge patching section, the method includes the following steps:

[0005] S1: the U rib plate of patching section is fixed by external spot welding with the U rib plate of the section to be repaired;

[0006] S2: U rib internal welding robot enters U rib interior from adjacent next patching section opening, runs to the U rib joint position of patching section along U rib inner hole, generates patching section U rib internal weld seam welding path;

[0007] S3: patching section U rib internal weld seam welding is carried out using U rib internal welding robot;

[0008] S4: U rib internal welding robot is removed from adjacent next patching section opening;

[0009] S5: patching section outer welding is cleaned;

[0010] S6: patching section U rib external joint welding is carried out;

[0011] S7: patching section U outer weld is impacted using ultrasonic impact method.

[0012] Preferably, the S2 includes the following steps:

[0013] According to the laser positioning result, the embedded section U rib inner welding seam welding path is generated, and different positions adopt corresponding welding specification parameters.

[0014] Preferably, the S3 comprises the following steps:

[0015] The U rib inner welding seam adopts single-layer single-pass welding seam.

[0016] Preferably, the S3 comprises the following steps:

[0017] The U rib inner welding method adopts flux-cored wire CO2 welding or solid core wire CO2 welding or MAG welding, the welding wire diameter is 1-1.4 mm, and the welding wire is transversely oscillated during welding.

[0018] Preferably, the S6 comprises the following steps:

[0019] The welding method adopts flux-cored wire CO2 welding or solid core wire CO2 welding, the welding wire diameter is 1-1.4 mm, the welding wire is transversely oscillated during welding, the oscillation frequency is 0.5-2 HZ, the oscillation amplitude is 1-3 mm, and the welding current is 120-250 A.

[0020] Preferably, the S1 comprises the following steps:

[0021] S1-1: Preparing the embedded section U rib plate and performing welding groove processing of the welding joint;

[0022] S1-2: Polishing and cleaning the welding area within 30 mm of the oil rust to the metal original color;

[0023] S1-3: Assembling and spot welding the embedded section 1 U rib plate.

[0024] Preferably, the S2 comprises the following steps:

[0025] The joint position of the to-be-welded part adopts laser positioning.

[0026] Preferably, the S2 comprises the following steps:

[0027] The U rib inner welding seam welding sequence of the embedded section is front end butt welding seam, inclined welding seam, tail end butt welding seam, or tail end butt welding seam, inclined welding seam, front end butt welding seam.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] The present application, by the preparation of the embedded section U rib plate, the welding groove processing, the polishing and cleaning of the welding area, the assembly and spot welding of the embedded section U rib plate, the U rib internal welding robot enters the inside of the U rib from the opening of the adjacent next embedded section, and laser positioning is generated, and the embedded section U rib internal welding seam welding path is generated, the embedded section U rib internal welding seam welding is carried out by the U rib internal welding robot by adopting the gas shielded arc welding method, the U rib internal welding robot is removed from the opening of the adjacent next embedded section, the embedded section external welding is carried out, the embedded section U rib external joint welding is carried out by adopting the gas shielded arc welding method, and the embedded section U external welding seam is impacted by adopting the ultrasonic impact method to reduce the welding tensile stress, the present application provides the embedded section internal and external joint double-sided welding problem of the U rib of the orthogonal steel structure bridge, and has economic benefit and social benefit. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments thereof, and explain the present application, and do not constitute a limitation of the present application. In the drawings:

[0031] Figure 1 It is a schematic view of the cross-sectional structure of the steel bridge in the present application;

[0032] Figure 2 It is a schematic view of the cross-sectional structure of the steel bridge in the present application;

[0033] Figure 3 It is a schematic view of the structure of the position of the embedded section U rib in the present application;

[0034] Figure 4 It is a schematic view of the structure of the assembly, joint type and welding groove of the embedded section 1 in the present application;

[0035] Figure 5 It is a schematic view of the U internal welding of the embedded section 1 by the U rib internal welding robot in the present application;

[0036] Figure 6 It is a schematic view of the U rib internal welding seam and the root cleaning before the external welding of the embedded section 1 in the present application;

[0037] Figure 7 It is a schematic view of the embedded section U rib internal and external welding seam section;

[0038] In the figure: 1, U rib plate; 2, longitudinal partition; 3, deck plate; 4, longitudinal manhole; 5, bridge bottom plate; 6, bottom plate reinforcing plate; 7, U rib embedded section 1; 8, U rib embedded section 2; 9, embedded section U rib plate front end butt joint; 10, embedded section U rib plate rear end butt joint; 11, embedded section U rib plate inner inclined angle joint; 12, embedded section U rib plate rear end butt joint inner welding groove; 13, embedded section U rib plate inclined angle welding groove; 14, U rib inner welding robot; 15, wire feeding trolley; 16, embedded section U rib plate butt joint inner welding seam; 17, embedded section U rib plate butt joint outer welding seam root cleaning; 18, embedded section U rib plate inner inclined angle welding seam; 19, butt joint inner welding seam; 20, butt joint outer welding seam; 21, corner joint outer welding seam; 22, joint inner welding seam. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] EMBODIMENT

[0041] Please refer to Figures 1-7 The present application provides the following technical solutions: a U rib plate embedded section welding process method of an orthogonal steel structure bridge, the method comprising the following steps:

[0042] S1: fixing the U rib plate of the embedded section to the U rib plate of the section to be repaired through external spot welding;

[0043] S1-1: preparing the U rib plate of the embedded section and performing welding groove of the welding joint;

[0044] S1-2: polishing and cleaning the welding area within 30 mm to expose the metal color;

[0045] S1-3: assembling and spot welding the U rib plate of the embedded section 1.

[0046] S2: the U rib inner welding robot enters the U rib interior from the opening of the adjacent next embedded section, runs along the U rib inner hole to the U rib joint position of the embedded section, and generates an embedded section U rib inner welding seam welding path; the U rib inner welding robot can be a combination of a small special U rib inner welding robot and a welding wire feeding trolley, or the small special U rib inner welding robot itself carries welding wire, or a wire feeding mechanism is used to feed welding wire for the small special U rib inner welding robot from the opening of the adjacent next embedded section.

[0047] S2-1: Generate the welding path for the inner weld of the U-rib in the patching section. Welding at different positions adopts the corresponding welding specification parameters. Specifically, the welding path for the inner weld of the U-rib in the patching section can be generated based on the laser positioning results.

[0048] S2-2; The joint position of the part to be welded is positioned by laser;

[0049] S2-3: The welding sequence of the U-rib inner weld of the patching section is either front butt weld, upward angle weld, and tail butt weld, or tail butt weld, upward angle weld, and front butt weld.

[0050] S3: Use a U-rib internal welding robot to weld the U-rib internal weld of the patch section;

[0051] S3-1: The inner weld of the U-rib plate adopts a single-layer, single-pass weld.

[0052] S3-2: The U-rib internal welding method adopts flux-cored wire CO2 welding, solid wire CO2 welding, or MAG welding, with a wire diameter of 1.2mm, and the wire is oscillating laterally during welding;

[0053] S3-3: During welding, the welding wire is oscillated laterally with an oscillation frequency of 0.5-2 Hz, an amplitude of 1-3 mm, and a welding current of 120-250 A.

[0054] S4: Remove the welding wire feeding trolley and U-rib internal welding robot from the opening of the adjacent next intercalation section;

[0055] S5: Perform root cleaning and welding of the patch section;

[0056] S6: Perform external joint welding of the U-rib of the patch section;

[0057] S6-1: The welding method adopts flux-cored wire CO2 welding or solid wire CO2 welding, with a wire diameter of 1.2mm. During welding, the wire is oscillated laterally with an oscillation frequency of 0.5~2HZ and an amplitude of 1~3mm. The welding current is 120~250A.

[0058] S7: After the temperature of the outer weld of the U-rib in the patch section drops to the ambient temperature, the outer weld of the U-rib in the patch section is impacted by ultrasonic impact.

[0059] Specifically, the welding of the patch section adopts a double-sided welding process, and the inner welding of the patch section is completed by a small, dedicated U-rib inner welding robot, which solves the problem of welding the U-rib of the patch section in a narrow space.

[0060] Specifically, the welding path of the U-rib inner weld in the patch segment is generated based on the laser positioning result, and the welding parameters of the corresponding welding specifications are adopted for welding at different positions.

[0061] Specifically, in S5, the inner weld of the U-rib plate adopts a single-layer single-pass weld.

[0062] Specifically, in S5, the U-rib internal welding method uses flux-cored wire CO2 welding, solid wire CO2 welding, or MAG welding, with a wire diameter of 1.2 mm, and the wire is oscillating laterally during welding.

[0063] Specifically, in S5, the welding wire oscillates laterally during welding, with an oscillation frequency of 0.5-2 Hz, an amplitude of 1-3 mm, and a welding current of 120-250 A.

[0064] Specifically, in S8, the welding method uses flux-cored wire CO2 welding or solid wire CO2 welding, with a wire diameter of 1.2 mm. During welding, the wire is oscillated laterally with an oscillation frequency of 0.5-2 Hz and an amplitude of 1-3 mm. The welding current is 120-250 A.

[0065] Example 1:

[0066] A double-sided welding process for U-rib plates in the patching section of orthogonal steel structure bridges is applicable to the welding of U-rib plates in the patching section of bridges under construction and the welding of U-rib plates in the patching section of bridges in service during reinforcement and maintenance.

[0067] Specifically, the corresponding U-rib plates for the patching sections are fabricated according to the number and dimensions of the required patching sections for the bridge [see appendix]. Figure 3 】;

[0068] The sequential construction method is adopted, and the patching section 1, patching section 2, ..., patching section N, patching section N+1 are constructed in sequence.

[0069] The welding process for each patch segment includes the following steps [taking patch segment 1 as an example]:

[0070] Further details: The welding bevel of the U-plate welded joint for the patch section, including bevel shape and dimensions; see attached document. Figure 4 [12. Inner weld bevel at the rear end of the U-rib plate of the patch section; 13. Angle weld bevel at the rear end of the U-rib plate of the patch section];

[0071] Further: Grind the rust within 30mm of the welded area to reveal the original metal color;

[0072] Further: Assemble and spot weld the U-rib plate of the patch section 1 to form the front butt joint 9, the rear butt joint 10, and the inner elevation angle joint 11 of the patch section U-rib plate, as shown in the appendix. Figure 4 ;

[0073] Furthermore: A small, specialized U-rib welding robot and welding wire feeding mechanism enter the interior of the U-rib from the opening of the patching section 2, and move along the inner hole of the U-rib to the U-rib joint position of the patching section 1. They then perform laser scanning of the joint position of the area to be welded, generating the welding path for the U-rib weld in the patching section. [Appendix] Figure 5 】;

[0074] Furthermore: the U-rib inner welding of the patch segment 1 was performed using gas metal arc welding (GMAW), and the welding was completed sequentially. Figure 4 The butt joint 9 at the front end of the patched U-rib plate, the inner angle joint 11 of the patched U-rib plate [two joints], and the butt joint 10 at the rear end of the patched U-rib plate, with the inner weld shape as shown in the attached figure. Figure 5 [Inner butt weld of patched U-rib plate 16], [Inner angle weld of patched U-rib plate 18];

[0075] Further: After the U-rib welding of the patch section is completed, the welding wire feeding trolley and the inner welding robot are removed from the opening of patch section 2; the outer welding root cleaning is then performed, see appendix. Figure 6 [17. Cleaning the root of the external weld seam of the U-rib plate in the patch section]

[0076] Furthermore: the external joint of the U-rib in the patch section 1 was welded using gas metal arc welding (GMAW), and the weld cross-section is shown in the attached figure. Figure 7 After the temperature of the U-shaped outer weld of the patch section drops to the ambient temperature, the U-shaped outer weld of the patch section is impacted by ultrasonic impact to reduce welding tensile stress.

[0077] In some embodiments of this application:

[0078] In S5, the welding method uses flux-cored wire CO2 welding, solid wire CO2 welding, or MAG welding. The wire diameter is 1.2 mm. During welding, the wire is oscillated laterally with an oscillation frequency of 0.5-2 Hz and an amplitude of 1-3 mm. The welding current is 120-250 A.

[0079] In some embodiments of this application:

[0080] In S8, the welding method uses flux-cored wire CO2 welding or solid wire CO2 welding with a wire diameter of 1.2 mm. During welding, the wire is oscillated laterally with an oscillation frequency of 0.5-2 Hz and an amplitude of 1-3 mm. The welding current is 120-250 A.

[0081] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The scope of protection of this invention does not involve any improvement to the software and methods.

[0082] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 welding process for inserting and filling U-rib plates in orthogonal steel structure bridges, characterized in that: The method comprises the following steps: S1: fixing the U-rib plate of the embedded repair section to the U-rib plate of the section to be repaired by external spot welding; S2: the U-rib internal welding robot enters the inside of the U-rib from the opening of the adjacent next embedded repair section, runs along the internal hole of the U-rib to the joint position of the U-rib plate of the embedded repair section, and generates an internal welding seam welding path of the U-rib plate of the embedded repair section; S3: performing internal welding seam welding of the U-rib plate of the embedded repair section by using the U-rib internal welding robot, wherein the internal welding seam of the U-rib plate of the embedded repair section adopts a single-layer single-pass welding seam, the internal welding seam welding method of the U-rib plate of the embedded repair section adopts flux-cored wire CO2 welding or solid wire CO2 welding or MAG welding, the welding wire diameter is 1-1.4 mm, the welding wire is transversely oscillated during welding, the oscillation frequency is 0.5-2 HZ, the oscillation amplitude is 1-3 mm, and the welding current is 120-250 A; S4: removing the U-rib internal welding robot from the opening of the adjacent next embedded repair section; S5: performing external welding cleaning of the embedded repair section; S6: performing external joint welding of the U-rib plate of the embedded repair section; S7: impacting the external welding seam of the U-rib plate of the embedded repair section by using the ultrasonic impact method.

2. The orthogonal steel structure bridge U-rib plate patch welding process method according to claim 1, characterized in that: The S2 comprises the following steps: The internal welding seam welding path of the U-rib plate of the embedded repair section is generated according to the laser positioning result, and corresponding welding specification parameters are adopted for welding at different positions.

3. The orthogonal steel structure bridge U-rib plate patch welding process method according to claim 1, characterized in that: The S6 comprises the following steps: The welding method adopts flux-cored wire CO2 welding or solid wire CO2 welding, the welding wire diameter is 1-1.4 mm, the welding wire is transversely oscillated during welding, the oscillation frequency is 0.5-2 HZ, the oscillation amplitude is 1-3 mm, and the welding current is 120-250 A.

4. The orthogonal steel structure bridge U-rib plate patch welding process method according to claim 1, characterized in that: The S1 comprises the following steps: S1-1: preparing the U-rib plate of the embedded repair section and performing welding groove processing of the welding joint; S1-2: polishing and cleaning the welding area within 30 mm to expose the metal color; S1-3: assembling and spot welding the U-rib plate of the embedded repair section.

5. The orthogonal steel structure bridge U-rib plate patch welding process method according to claim 1, characterized in that: The S2 comprises the following steps: The joint position of the welding site is positioned by using a laser.

6. The orthogonal steel structure bridge U-rib plate patch welding process method according to claim 1, characterized in that: The S2 comprises the following steps: The internal welding seam welding sequence of the U-rib plate of the embedded repair section is front-end butt welding seam, inclined welding seam, tail-end butt welding seam; or the internal welding seam welding sequence of the U-rib plate of the embedded repair section is tail-end butt welding seam, inclined welding seam, front-end butt welding seam.

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