A Q690qD high-strength steel beam member multi-chamber structure welding method

Abstract

The invention discloses a method for welding a multi-chamber structure of a Q690qD high-strength steel beam member. First, a flat top plate unit and an inclined top plate unit are welded together to form a top plate unit, which is placed in a required position. A plurality of side partition plate units, a side web plate unit, a middle web plate unit, a plurality of middle partition plate units, an inner web plate unit, and a plurality of inner partition plate units are positioned and assembled in sequence from right to left on one side of a plate rib on the top plate unit, and then welded in a designed order. The inclined bottom plate unit is positioned and assembled to the top of the middle partition plate unit and the top of the inner partition plate unit, and the flat bottom plate unit is positioned and assembled to the top of the side partition plate unit to form a multi-chamber component, which is then turned right 180 degrees as a whole, and then welded to the inclined bottom plate unit and the flat bottom plate unit and the remaining units in a designed order. The side partition plate unit, the butt plate unit, and the stiffening plate are then positioned and assembled and welded to complete the welding of the multi-chamber structure. The method can reduce the welding residual stress of the weld, reduce welding deformation, and ensure the dimensional accuracy of the component.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge manufacturing, and in particular relates to a method for assembling and welding a Q690qD high-strength steel beam member multi-box chamber structure. Background Art

[0002] With the rapid development of bridge construction in recent years, the pursuit of lighter steel bridges and longer spans has also driven the development of high-performance steel materials. The use of 690MPa-yield strength steel in steel bridges has increased annually. The upper chord of the Macau-Taipa Fourth Bridge project features a three-chamber box-type structure. The compression zones at both ends of the upper chord are made of Q690qD steel. The maximum outer dimensions of a single upper chord are 3.2m × 3.6m × 15m, and the total steel consumption is approximately 1,100 tons.

[0003] The upper chord is a large and complex component. The overall weld deformation is difficult to control, and the residual stress is high, which affects the dimensional accuracy of the upper chord. The weld deformation of the upper chord needs to be corrected using flame straightening. However, due to the special rolling process of Q690qD steel, which uses TMCP (Thermo-Mechanical Control Process) plus tempering, the use of higher flame straightening temperatures will cause varying degrees of decline in mechanical properties such as yield strength, tensile strength, and elongation. Therefore, the flame straightening temperature of Q690qD steel is strictly controlled during the upper chord production process, requiring it to not exceed 600°C. This requires multiple low-temperature straightening operations, which greatly increases the flame straightening workload and cycle time, reducing production efficiency. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a method for welding a Q690qD high-strength steel beam member multi-box structure.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] A Q690qD high-strength steel beam member multi-chamber structure welding method includes the following steps:

[0007] S1: First, weld the flat top plate unit and the inclined top plate unit together to form a top plate unit, then place the top plate unit on the tire frame with its plate ribs facing upward and the flat top plate unit facing right, and then, on one side of the plate ribs on the top plate unit, sequentially position and assemble a number of side partition units, side web units, middle web units, a number of middle partition units, inner web units and a number of inner partition units from right to left; wherein, the side web units, middle web units and inner web units are all arranged on the flat top plate; the side partition unit is clamped between the side web unit and the middle web unit, and the node plates extending from the side web unit and the middle web unit extend out of the top end of the side partition unit; the middle partition unit is clamped between the middle web unit and the inner web unit, the inner partition unit is arranged on the inclined top plate and is located on the left side of the inner web unit, and the top end of the middle partition unit is an inclined surface;

[0008] S2: First, weld the welds between the middle web unit, the side web unit, and the inner web unit and the top plate unit in sequence; then weld the welds between the side partition unit and the side web unit, the middle web unit, the welds between the middle partition unit and the middle web unit, the welds between the inner web unit, and the welds between the inner partition unit and the inner web unit in sequence; finally, weld the welds between the side partition unit, the middle partition unit, and the inner partition unit and the top plate unit in sequence, and the welding order of the welds between the side partition unit, the middle partition unit, and the inner partition unit and the top plate unit is from the middle to the two ends;

[0009] S3: After assembling the inclined bottom plate unit to the top of the middle partition plate unit and the inner partition plate unit, and assembling the flat bottom plate unit to the top of the side partition plate unit to form a multi-chamber component, the component is flipped rightward 180° so that the top plate unit is fixed upward on the tire frame; first, weld the internal welds between the flat bottom plate unit and the side web plate unit and the middle web plate unit, then weld the internal welds between the inclined bottom plate unit and the middle web plate unit, and finally weld the welds between the inclined bottom plate unit and the inner web plate unit; then, weld the welds between the flat bottom plate unit and the side partition plate unit, and between the inclined bottom plate unit and the middle partition plate unit and the inner partition plate unit in sequence;

[0010] S4: Turn the multi-chamber component formed in S3 180° to the left, place the top plate unit downward on the frame, and then weld the outer welds between the flat bottom plate unit and the side web unit and the middle web unit first, and then weld the outer welds between the inclined bottom plate unit and the middle web unit.

[0011] S5: Flip the multi-chamber component formed in S4 90° to the right, place the side web unit downward on the jig, and position and assemble the side diaphragm unit, the butt plate unit, and the stiffening plate between the side web unit and the gusset plate extending from the middle web unit;

[0012] S6: First weld the welds between the side diaphragm units and the edge web units, the middle web units, and the butt plate units, then weld the welds between the butt plate units and the edge web units, and the middle web units, and finally weld the welds between the stiffening plates and the edge web units, and the middle web units to complete the assembly welding of the Q690qD high-strength steel beam member multi-box structure.

[0013] Furthermore, the inclined bottom plate unit is welded together by a first inclined bottom plate unit and a second inclined bottom plate unit, and the first inclined bottom plate unit is parallel to the inclined top plate unit, and the inclination of the second inclined bottom plate unit is consistent with the inclination of the inclined surface at the top of the middle partition unit; the first inclined bottom plate is arranged at the top of the inner partition unit, and the second inclined bottom plate is arranged at the top of the middle partition unit.

[0014] Preferably, the top plate unit and the inclined bottom plate unit are both welded by a combined welding method of argon-rich gas shielded welding + submerged arc welding.

[0015] Preferably, the welding directions of the welds between the middle web unit, the side web unit and the inner web unit and the top plate unit, the welds inside the box between the flat bottom plate unit and the side web unit and the middle web unit, the welds inside the box between the inclined bottom plate unit and the middle web unit, the welds between the inclined bottom plate unit and the inner web unit, the welds outside the box between the flat bottom plate unit and the side web unit and the middle web unit, and the welds outside the box between the inclined bottom plate unit and the middle web unit are all the same.

[0016] Preferably, the welding directions of the welds between the side partition units and the side web units, the middle web units, the welds between the middle partition units and the middle web units, the inner web units, and the welds between the inner partition units and the inner web units are all from bottom to top.

[0017] Beneficial effects of the present invention:

[0018] 1. This invention, through a rational assembly sequence, welding sequence, and welding process, breaks down the overall assembly and welding process into step-by-step assembly and welding. This step-by-step process releases the welding stress generated during the welding of multi-chamber Q690qD high-strength steel beams in stages. This effectively controls welding deformation during the production of Q690qD high-strength steel beams, reduces the heating temperature and difficulty of flame straightening welding deformation, and mitigates the impact of flame straightening on the properties of the Q690qD steel itself. This ensures the dimensional accuracy and performance requirements of Q690qD high-strength steel beams, resulting in extremely high practical and commercial value. It also serves as a valuable reference for the production of similar steel truss multi-chamber structures.

[0019] 2. The present invention facilitates welding for operators by appropriately flipping the entire component, thereby reducing welding difficulty and improving welding efficiency and quality.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the multi-chamber structure of the upper chord;

[0022] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0023] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the middle BB;

[0024] Figures 4-11 Schematic diagram of the welding process of a multi-chamber structure.

[0025] Description of reference numerals:

[0026] 1-top plate unit; 2-bottom plate unit; 3-partition plate unit; 4-web plate unit; 5-butting plate unit; 6-stiffening plate unit; 1-1-flat top plate unit; 1-2-inclined top plate unit; 2-1-flat bottom plate unit; 2-2-first inclined bottom plate unit; 2-3-second inclined bottom plate unit; 3-1-side partition plate unit; 3-2-middle partition plate unit; 3-3-inner partition plate unit; 3-4-side partition plate unit; 4-1-side web plate unit; 4-2-middle web plate unit; 4-3-inner web plate unit. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to specific examples, but the embodiments of the present invention are not limited thereto.

[0028] First of all, it should be noted that the directional words such as up, down, left and right mentioned in the present invention are only described according to the corresponding drawings for the convenience of understanding, and are not intended to limit the technical solution of the present invention and the scope of protection requested.

[0029] The embodiment of the present invention provides a Q690qD high-strength steel beam member multi-chamber structure welding method, specifically a Q690qD high-strength upper chord welding method, the structure of the upper chord is as follows Figures 1 to 3 As shown, it includes a top plate unit, a bottom plate unit, a partition unit, a web unit, a butt plate unit and a stiffening plate; the top plate unit includes a flat top plate unit and an inclined top plate unit; the bottom plate unit includes a flat bottom plate unit and an inclined bottom plate unit; the partition unit includes an edge partition unit, a middle partition unit, an inner partition unit and a side partition unit; the web unit includes an edge web unit, a middle web unit and an inner web unit; the above components are all manufactured according to the design requirements, and are positioned and assembled according to the design drawings.

[0030] The welding method specifically comprises the following steps:

[0031] S1: First, assemble and weld the flat top plate unit and the inclined top plate unit into the top plate unit, and press Figure 4 Place the top plate unit horizontally on the tire frame with the plate ribs facing upwards and the flat top plate unit facing right. Then, assemble several side partition plate units, side web plate units and middle web plate units in sequence from right to left on the side of the plate ribs on the top plate unit. Figure 4 and Figure 5 As shown, finally, several middle partition plate units, inner web plate units and several inner partition plate units are positioned and assembled in sequence in a horizontal position, as shown in FIG. Figure 6 and Figure 7 As shown; wherein, the side web unit, the middle web unit and the inner web unit are all arranged on the flat top plate; the side diaphragm unit is clamped between the side web unit and the middle web unit, and the node plates extending from the side web unit and the middle web unit extend out of the top of the side diaphragm unit; the middle diaphragm unit is clamped between the middle web unit and the inner web unit, and the inner diaphragm unit is arranged on the inclined top plate and located on the left side of the inner web unit, and the top of the middle diaphragm unit is an inclined surface;

[0032] Among them, the flat top plate unit and the inclined top plate unit are assembled and welded into a top plate unit in advance using a combined welding method of argon-rich gas shielded welding + submerged arc welding, which facilitates the control and correction of welding deformation, thereby reducing the construction difficulty and lowering the heating temperature of flame correction.

[0033] S2: After step 1 positioning and assembly is completed and passed the inspection, follow the attached Figure 7 The positions shown are welded using CO2 gas shielded welding in the following welding sequence; the flux-cored wire is JQ.YJ761N4M2-1 with a diameter of 1.2 mm. The CO2 gas shielded welding method has a low heat input, which can reduce welding deformation of the component and reduce the difficulty of flame correction. Specifically:

[0034] S21: First, weld the middle web unit, the side web unit, and the welds between the inner web unit and the top plate unit in sequence, with the welding direction from area E to area A;

[0035] S22: Then, weld the welds between the side diaphragm units and the side web units, the middle web units, the welds between the middle diaphragm units and the middle web units, the welds between the inner web units, and the welds between the inner diaphragm units and the inner web units in sequence, with the welding direction from bottom to top;

[0036] S23: Finally, the welds between the side partition plate unit, the middle partition plate unit, and the inner partition plate unit and the top plate unit are welded in sequence, and the welding order of the welds between the side partition plate unit, the middle partition plate unit, and the inner partition plate unit and the top plate unit is carried out from the middle to the two ends.

[0037] S3: Position and assemble the inclined bottom plate unit to the middle partition plate unit and the top of the inner partition plate unit, and position and assemble the flat bottom plate unit to the top of the side partition plate unit to form a multi-chamber component. The assembly result is as follows: Figure 8 After the positioning and assembly are completed and tested, the multi-chamber component is turned rightward 180 degrees to Figure 9 The top plate unit is fixed on the tire frame with the top plate facing upwards, and then CO2 gas shielded welding is performed according to the following welding sequence; wherein, the flux-cored wire model is JQ.YJ761N4M2-1, with a diameter of 1.2mm; specifically,

[0038] S31: First, weld the inner welds between the flat bottom plate unit and the side web unit and the middle web unit, then weld the inner welds between the inclined bottom plate unit and the middle web unit, and finally weld the welds between the inclined bottom plate unit and the inner web unit. The welding direction is from area E to area A.

[0039] S32: Then, the welds between the flat bottom plate unit and the side partition plate unit, the welds between the inclined bottom plate unit and the middle partition plate unit, and the welds between the inner partition plate unit are welded in sequence, and the welding order is from the middle of the component to both ends, so as to facilitate the release of the welding stress of the weld, reduce the constraint degree of the component, and reduce the residual stress of the weld.

[0040] Furthermore, the inclined bottom plate unit is welded together by a first inclined bottom plate unit and a second inclined bottom plate unit, and the first inclined bottom plate unit is parallel to the inclined top plate unit, and the inclination of the second inclined bottom plate unit is consistent with the inclination of the inclined surface at the top of the middle partition plate unit; the first inclined bottom plate is arranged at the top of the inner partition plate unit, and the second inclined bottom plate is arranged at the top of the middle partition plate unit. The positional relationship mentioned in this paragraph is based on Figure 8 Component locations shown.

[0041] Among them, the inclined bottom plate unit is welded by a combined welding method of argon-rich gas shielded welding + submerged arc welding, and the first inclined bottom plate unit and the second inclined bottom plate unit are welded into an inclined bottom plate unit in advance, which facilitates the control and correction of welding deformation, thereby reducing the construction difficulty and lowering the heating temperature of flame correction.

[0042] S4: After S3 welding is completed, the multi-chamber component formed by S3 is turned 180° to the left. Figure 10 The position shown is to place the top plate unit downward on the tire frame, thereby reducing the difficulty of subsequent welding and facilitating welding operations. After the multi-chamber components are turned over, submerged arc automatic welding is used for welding in the following welding sequence. The submerged arc automatic welding can improve welding efficiency and ensure beautiful weld formation; specifically,

[0043] S41: First, weld the outer welds between the flat bottom plate unit and the side web unit and the middle web unit; the welding direction is from area E to area A;

[0044] S42: Then weld the outer weld between the inclined bottom plate unit and the middle web unit, and the welding direction is from area E to area A.

[0045] S5: After finishing the weld seam welded in S4, turn the multi-chamber component formed in S4 to the right by 90°. Figure 11 The side web unit is placed on the frame with the side web unit facing downwards. This flipping process can facilitate the assembly of components and ensure the assembly accuracy. After the flipping is completed, the side diaphragm unit, the butt plate unit and the stiffener plate are positioned and assembled between the side web unit and the node plate extending from the middle web unit. The assembly result is shown in the figure. Figure 11 and Figure 3 shown.

[0046] S6: The multi-chamber components assembled in S6 were welded using CO2 gas shielded welding in the following welding sequence; the flux-cored wire model was JQ.YJ761N4M2-1, with a diameter of 1.2 mm; specifically,

[0047] S61: First, weld the welds between the side bulkhead unit and the side web unit, the middle web unit, and the butt plate unit;

[0048] S62: Then weld the welds between the butt plate unit and the side web unit and the middle web unit, with the weld direction from inside to outside;

[0049] S63: Finally, weld the welds between the stiffener plate and the side web elements and the middle web elements.

[0050] S7: S6 welding is completed and the welds are corrected. The overall dimensions of the components and the welding quality are checked. After passing the inspection, the assembly welding of the Q690qD high-strength bridge steel multi-box structure is completed.

[0051] From the above overall content, it can be seen that the welding directions of the welds between the middle web unit, the side web unit and the inner web unit and the top plate unit, the welds inside the box between the flat bottom plate unit and the side web unit, the middle web unit, the welds inside the box between the inclined bottom plate unit and the middle web unit, the welds between the inclined bottom plate unit and the inner web unit, the welds outside the box between the flat bottom plate unit and the side web unit, the middle web unit, and the welds outside the box between the inclined bottom plate unit and the middle web unit are all the same, which can avoid the overall distortion of the component during welding, thereby reducing the welding deformation of the component and reducing the difficulty of flame correction.

[0052] Practice has proved that this welding method of the present invention, in the process of manufacturing the box-type members of the upper chord of the steel truss of the Macau-Taipa Fourth Bridge, decomposes the overall assembly and welding process into step-by-step assembly and welding by setting a reasonable assembly sequence and welding sequence. The welding stress generated by the multi-box structure of the steel beam members during the welding process can be released in stages through the step-by-step assembly and welding, which can effectively control the welding deformation of the steel beam members, reduce the heating temperature and working difficulty of flame correction welding deformation, reduce the influence of flame correction on the performance of Q690qD steel itself, ensure the dimensional accuracy and performance requirements of the steel beam members, fully meet the welding quality requirements of the project, and have extremely high practical and promotion value. It can play a good reference role in the subsequent manufacturing process of similar steel truss multi-box structures.

[0053] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A Q690qD high-strength steel beam member multi-chamber structure welding method, characterized in that: The following steps are involved: S1: First, weld the flat top plate unit and the inclined top plate unit together to form a top plate unit, then place the top plate unit on the tire frame with its plate ribs facing upward and the flat top plate unit facing right, and then, on one side of the plate ribs on the top plate unit, sequentially position and assemble a number of side partition units, side web units, middle web units, a number of middle partition units, inner web units and a number of inner partition units from right to left; wherein, the side web units, middle web units and inner web units are all arranged on the flat top plate; the side partition unit is clamped between the side web unit and the middle web unit, and the node plates extending from the side web unit and the middle web unit extend out of the top end of the side partition unit; the middle partition unit is clamped between the middle web unit and the inner web unit, the inner partition unit is arranged on the inclined top plate and is located on the left side of the inner web unit, and the top end of the middle partition unit is an inclined surface; S2: First, weld the welds between the middle web unit, the side web unit, and the inner web unit and the top plate unit in sequence; then weld the welds between the side partition unit and the side web unit, the middle web unit, the welds between the middle partition unit and the middle web unit, the welds between the inner web unit, and the welds between the inner partition unit and the inner web unit in sequence; finally, weld the welds between the side partition unit, the middle partition unit, and the inner partition unit and the top plate unit in sequence, and the welding order of the welds between the side partition unit, the middle partition unit, and the inner partition unit and the top plate unit is from the middle to the two ends; S3: After assembling the inclined bottom plate unit to the top of the middle partition plate unit and the inner partition plate unit, and assembling the flat bottom plate unit to the top of the side partition plate unit to form a multi-chamber component, the component is flipped rightward 180° so that the top plate unit is fixed upward on the tire frame; first, weld the internal welds between the flat bottom plate unit and the side web plate unit and the middle web plate unit, then weld the internal welds between the inclined bottom plate unit and the middle web plate unit, and finally weld the welds between the inclined bottom plate unit and the inner web plate unit; then, weld the welds between the flat bottom plate unit and the side partition plate unit, and between the inclined bottom plate unit and the middle partition plate unit and the inner partition plate unit in sequence; S4: Turn the multi-chamber component formed in S3 180° to the left, place the top plate unit downward on the frame, and then weld the outer welds between the flat bottom plate unit and the side web unit and the middle web unit first, and then weld the outer welds between the inclined bottom plate unit and the middle web unit. S5: Flip the multi-chamber component formed in S4 90° to the right, place the side web unit downward on the jig, and position and assemble the side diaphragm unit, the butt plate unit, and the stiffening plate between the side web unit and the gusset plate extending from the middle web unit; S6: First weld the welds between the side diaphragm units and the edge web units, the middle web units, and the butt plate units, then weld the welds between the butt plate units and the edge web units, and the middle web units, and finally weld the welds between the stiffening plates and the edge web units, and the middle web units to complete the assembly welding of the Q690qD high-strength steel beam member multi-box structure.

2. The Q690qD high-strength steel beam member multi-chamber structure assembly welding method according to claim 1 is characterized in that: The inclined bottom plate unit is welded together by a first inclined bottom plate unit and a second inclined bottom plate unit, and the first inclined bottom plate unit is parallel to the inclined top plate unit, and the inclination of the second inclined bottom plate unit is consistent with the inclination of the inclined surface at the top end of the middle partition plate unit; When the top plate unit is placed on a tire frame with its plate ribs facing upward, the first inclined bottom plate is arranged on the top of the inner partition plate unit, and the second inclined bottom plate is arranged on the top of the middle partition plate unit.

3. The Q690qD high-strength steel beam member multi-chamber structure assembly welding method according to claim 2 is characterized in that: The top plate unit and the inclined bottom plate unit are both welded by a combined welding method of argon-rich gas shielded welding and submerged arc welding.

4. The Q690qD high-strength steel beam member multi-chamber structure assembly welding method according to claim 1, 2 or 3, characterized in that: The welding directions of the welds between the middle web unit, the side web unit and the inner web unit and the top plate unit, the welds inside the box between the flat bottom plate unit and the side web unit and the middle web unit, the welds inside the box between the inclined bottom plate unit and the middle web unit, the welds between the inclined bottom plate unit and the inner web unit, the welds outside the box between the flat bottom plate unit and the side web unit and the middle web unit, and the welds outside the box between the inclined bottom plate unit and the middle web unit are all the same.

5. The Q690qD high-strength steel beam member multi-chamber structure welding method according to claim 4 is characterized in that: The welding directions of the welds between the side partition units and the side web units, the middle web units, the welds between the middle partition units and the middle web units, the inner web units, and the welds between the inner partition units and the inner web units are all from bottom to top.

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