An ultra-wide broken-line steel-concrete composite beam H-shaped rib bottom plate unit and its manufacturing method

Abstract

This application discloses an H-shaped ribbed floor unit for an ultra-wide, zigzag steel-concrete composite beam and a method for fabricating it. This relates to the field of bridge construction technology. The unit comprises a panel unit, which is a zigzag panel; multiple crossbeam joint plates, spaced apart and installed on one side of the panel unit; and multiple H-shaped stiffening ribs, spaced apart and installed on the panel unit, extending along the length of the panel unit. This application also discloses a method for fabricating an H-shaped ribbed floor unit for an ultra-wide, zigzag steel-concrete composite beam. This invention addresses the technical issues of difficult welding and low fabrication precision associated with existing steel-concrete composite beam floor units.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to an H-shaped ribbed bottom plate unit of an ultra-wide broken-line steel-concrete composite beam and a manufacturing method thereof. Background Art

[0002] Considering the stress characteristics and material economy of the steel main beams of steel-concrete composite beam bridges, the design process often involves increasing the cross-section of the steel beams at the piers while tightening the load-bearing requirements of the stiffeners in the middle pier area. To accommodate the changes in the box-end cross-section of the steel beams along the length of the bridge, the main beam bottom plate unit must adopt a zigzag design at the middle pier. However, due to the limited rolling capacity of the steel mill, panels with a width exceeding 4 meters generally require splicing. The traditional construction method of bending first and then widening makes it difficult to ensure the camber of the zigzag bottom plate unit, and it cannot meet the matching accuracy requirements of the ring opening at the steel-concrete composite beam bridge construction site. Summary of the Invention

[0003] The purpose of the present invention is to provide an ultra-wide broken line steel-concrete composite beam H-shaped rib bottom plate unit and a manufacturing method thereof, which solves the technical problems of difficult welding and low manufacturing precision during the manufacturing of the bottom plate unit of the steel-concrete composite beam in the prior art.

[0004] The present application discloses an H-shaped ribbed floor unit of an ultra-wide broken-line steel-concrete composite beam, comprising:

[0005] a panel unit, wherein the panel unit is a folded-line panel;

[0006] a plurality of beam joint plates installed at intervals on one side of the panel unit;

[0007] A plurality of H-shaped stiffening ribs are installed on the panel unit at intervals, and the stiffening ribs extend along the length direction of the panel unit;

[0008] The stiffening ribs include:

[0009] at least two vertical plates installed on the panel unit at intervals;

[0010] At least one cover plate is disposed between the two vertical plates, and the bottom side of the cover plate, the inner wall of the vertical plate and the upper side of the panel unit are combined to form an assembly cavity;

[0011] A plurality of support plates are installed at intervals on the inner wall of the assembly cavity, and the support plates are distributed along the length direction of the assembly cavity;

[0012] At least two steel liners are respectively provided at both ends of the cover plate;

[0013] At least two sealing plates are respectively arranged at two ends of the assembly cavity.

[0014] The base plate unit in this application innovatively applies the structural design of H-shaped stiffening ribs, which significantly improves the welding efficiency and quality stability of the base plate unit.

[0015] Based on the above technical solution, the embodiment of the present application can also be improved as follows:

[0016] Furthermore, the number of the steel liners and the sealing plates in each stiffening rib is at least eight;

[0017] The panel unit is formed by welding a plurality of panels together. The beneficial effect of adopting this step is to ensure the stability of the structure through the multiple connecting components.

[0018] The present application also discloses a method for manufacturing an H-shaped ribbed bottom plate unit of an ultra-wide broken-line steel-concrete composite beam, comprising the following steps:

[0019] S1: Processing of parts:

[0020] S101: flame cutting the vertical plates, cover plates, support plates, steel liners and cover plates, cutting out welding grooves, and setting the camber of the vertical plates;

[0021] S102: Remove the warping and wave deformation of the panel so that the flatness deviation of the panel does not exceed 1mm / 1m; perform top bending processing on the vertical plate and cover plate, and the plate rib height needs to be raised at multiple points to ensure smooth fitting, and the height deviation is not more than 2mm;

[0022] S103: Marking the bending lines of the vertical plates and the cover plates on the flat tire, and marking the horizontal reference lines on the panel;

[0023] S104: Welding the panels into the panel units based on the horizontal reference line;

[0024] S105: Correcting the horizontal reference line based on the widthwise outline of the panel unit, and drawing a vertical reference line perpendicular to the horizontal reference line, and then drawing the assembly position line of the vertical plate and the bending line of the panel unit based on the vertical and horizontal reference lines;

[0025] S106: bending the vertical plate, the cover plate and the panel unit based on the bending lines of the vertical plate, the cover plate and the panel unit;

[0026] S2: Primary welding of plate element:

[0027] S201: Arrange multiple stays of different heights above the assembly frame, place the panel unit on the stays, and set weight blocks at the piers of the panel unit so that the back side of the panel unit is closely attached to the stays and fixed by spot welding;

[0028] S202: Welding the vertical plate to the panel unit. The welds between the vertical plate and the panel unit are required to be grooved within an area of ​​1.0 m on both sides of the centerline of the pier. The remaining area is required to be fillet welded. When the groove area of ​​the vertical plate transitions to the non-groove area, a transition slope of 1:5 is provided in the thickness direction of the vertical plate to ensure a smooth transition of the weld.

[0029] S3: Secondary welding of plate elements:

[0030] S301: Divide the vertical plates, divide two adjacent vertical plates into one stiffening rib, and weld the stiffening rib. The specific steps of processing each stiffening rib are as follows: symmetrically weld multiple support plates on the inner sides of the two vertical plates, with the interval between two adjacent support plates not exceeding 1.5m, and weld the cover plate between the two vertical plates;

[0031] S302: Perform non-destructive testing on the fillet weld between the cover plate and the vertical plate using ultrasonic testing. If the test is qualified, proceed to the next step;

[0032] S4: Three-step welding of plate elements:

[0033] S401: assembling the sealing plate and the steel liner in sequence, and assembling the joint plate based on the longitudinal and transverse reference lines;

[0034] S402: Welding the joint plate, sealing plate and steel liner to complete the processing.

[0035] Based on the above technical solution, the embodiment of the present application can also be improved as follows:

[0036] Furthermore, the welding method of step S104 is: before welding, the two sides of the butt weld of the panel are heated to the preheating temperature requirement by a flexible electromagnetic induction heating belt and the pre-deformation is set, and the welding is completed by a composite welding process of solid welding wire CO2 gas shielded welding for base and submerged arc automatic welding for filling and covering. The gas shielded welding welding material is a solid welding wire with a diameter of 1.2 mm, and the submerged arc welding material is a welding wire with a diameter of 5.0 mm. The beneficial effect of adopting this step is to improve the welding quality through the corresponding welding method.

[0037] Furthermore, the step S1 further includes a secondary flaw detection. The first flaw detection is between step S104 and step S105, i.e., non-destructive flaw detection is performed on the longitudinal butt welds between the panels using an ultrasonic testing method. If the test is qualified, step S105 is performed; otherwise, the process returns to step S104.

[0038] The second flaw detection is after step S106, that is, the longitudinal butt weld within 150mm on both sides of the bending position line of the panel is subjected to radiographic inspection. If the inspection is qualified, step S2 is performed. The beneficial effect of this step is to ensure quality through multiple flaw detections.

[0039] Furthermore, the step S2 also includes step S203: a third flaw detection, using magnetic particle testing to perform non-destructive flaw detection on the fillet weld, and using ultrasonic testing to perform non-destructive flaw detection on the groove fillet weld. If the test is qualified, proceed to the next step.

[0040] The fillet welds between the vertical plates and the panels are non-destructively tested using the magnetic particle testing method, and the groove fillet welds are non-destructively tested using the ultrasonic testing method. After passing the test, proceed to the next step.

[0041] Furthermore, the step S2 also includes step S204: thermal correction, removing the weight block, and thermally correcting the vertical plate by flame baking, wherein the verticality deviation between the vertical plate and the panel unit is allowed to be no more than 0.5 mm after correction.

[0042] Furthermore, the welding method of step S301 is to use a semi-automatic welding trolley in conjunction with a flux-cored wire CO2 gas shielded welding method to complete the welding of the groove fillet weld between the cover plate and the vertical plate.

[0043] Furthermore, the step S3 further includes the following steps:

[0044] S303: Clear the restraint weld between the panel and the frame support, check the linear shape of the panel unit in the free state, and thermally correct the panel unit by flame baking. After correction, the transverse flatness of the panel unit does not exceed 1mm / 1m, and the allowable deviation of the camber value along the bridge direction is 0~+5mm.

[0045] S304: Correcting the longitudinal and transverse reference lines of the bottom plate unit, and then drawing two short side cutting lines with the transverse reference line according to the actual size of the bottom plate unit.

[0046] S305: Reserving cutting allowances for the two short sides of the panel unit to ensure the overall outline size of the bottom plate unit.

[0047] Furthermore, the step S4 further includes the following steps:

[0048] S403: Perform non-destructive testing on the butt weld between the beam joint plate and the panel using ultrasonic testing. After passing the test, mark and flame cut the arc portion of the beam joint plate, where the arc radius is 200 mm.

[0049] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0050] 1. This application improves the bottom plate unit by changing the U-rib to an H-shaped rib. On the premise of ensuring the stress requirements of the steel beam at the middle pier, it effectively avoids the technical difficulties of internal welding and repair of traditional closed U-rib welds, and significantly improves the welding efficiency and quality stability of the bottom plate unit.

[0051] 2. In this application, support plates are welded symmetrically and equidistantly on the inner side of the vertical plate to improve welding efficiency and quality stability, improve the overall rigidity of the H-shaped stiffening rib cover plate during assembly, reduce the distortion of the H-shaped stiffening rib cover plate during welding and hoisting, and greatly improve the overall welding accuracy of the H-shaped rib bottom plate unit.

[0052] 3. The manufacturing method disclosed in this application includes formulating the overall welding sequence of the H-rib bottom plate unit, determining the detailed rules for the welding angle at the end of the vertical plate, providing the welding groove type and parent material transition principle of the welds in each part, and the bottom plate unit has high welding efficiency, small deformation after welding and a one-time inspection pass rate of more than 98%.

[0053] 4. This application has developed a process flow in which the panels are first widened and then bent, and has determined an assembly process in which a special assembly frame is used as the outer tire and a vertical plate with a preset arch is used as the inner tire. Combined with the constraint measure of setting a weight block in the middle of the plate unit, it effectively ensures the finished line shape of the bottom plate unit, lays a solid foundation for subsequent overall assembly and bridge construction, and significantly improves the accuracy of ring mouth matching and actual bridge line shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 This is a structural schematic diagram of an H-shaped ribbed bottom plate unit of an ultra-wide broken-line steel-concrete composite beam according to a specific embodiment of the present invention;

[0056] Figure 2 for Figure 1 A partial schematic diagram of

[0057] Figure 3 for Figure 1 Left view of;

[0058] Figure 4 for Figure 3 A magnified schematic diagram of a local area A;

[0059] Figure 5 yes Figure 1 Side view of the mid-panel unit;

[0060] Figure 6 yes Figure 1 a top view of the mid-panel unit;

[0061] Figure 7 This is a schematic diagram of a manufacturing method and process for an H-shaped ribbed bottom plate unit of an ultra-wide broken-line steel-concrete composite beam according to a specific embodiment of the present invention;

[0062] Figure 8 This is a schematic diagram of the assembly of the jig frame in a method for manufacturing an H-shaped ribbed bottom plate unit of an ultra-wide broken-line steel-concrete composite beam according to a specific embodiment of the present invention;

[0063] 1-panel unit; 2-beam joint plate; 3-stiffening rib;

[0064] 101-Panel;

[0065] 301-vertical plate; 302-cover plate; 303-assembly cavity; 304-support plate; 305-steel liner; 306-sealing plate. DETAILED DESCRIPTION

[0066] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0067] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0068] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0069] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0070] Example:

[0071] like Figure 1-6 As shown, the embodiment of the present application discloses an ultra-wide broken line steel-concrete composite beam H-shaped rib bottom plate unit, the specific structure of which includes:

[0072] A panel unit 1, wherein the panel unit 1 is a folded-line panel;

[0073] A plurality of beam joint plates 2 are installed at intervals on one side of the panel unit 1;

[0074] A plurality of stiffening ribs 3, each of which is H-shaped and installed on the panel unit 1 at intervals, and extending along the length direction of the panel unit;

[0075] The stiffening rib 3 comprises:

[0076] At least two vertical plates 301 are installed on the panel unit 1 at intervals;

[0077] At least one cover plate 302 is disposed between the two vertical plates 301 , and the bottom side of the cover plate 302 , the inner wall of the vertical plates 301 and the upper side of the panel unit 1 are combined to form an assembly cavity 303 ;

[0078] A plurality of support plates 304 are installed at intervals on the inner wall of the assembly cavity 303, and the support plates 304 are distributed along the length direction of the assembly cavity 303;

[0079] At least two steel liners 305 are respectively provided at both ends of the cover plate 302;

[0080] At least two sealing plates 306 are respectively disposed at two ends of the assembly cavity 303 .

[0081] In one embodiment, the number of the steel pads 305 and the sealing plates 306 in each of the stiffening ribs 3 is at least eight;

[0082] The panel unit 1 is formed by welding a plurality of panels 101 together.

[0083] Example 2:

[0084] Based on Example 1, Figure 7-8 As shown, the present application also discloses a method for manufacturing an H-shaped rib bottom plate unit of an ultra-wide broken-line steel-concrete composite beam, comprising the following steps:

[0085] S1: Processing of parts:

[0086] S101: flame cutting the vertical plates, cover plates, support plates, steel liners and cover plates, cutting out welding grooves, and setting the camber of the vertical plates; the details are as follows:

[0087] The vertical plates, cover plates and panels are flame cut by CNC cutting machines, and the welding grooves are cut on the flat tires by flame cutting trolleys. The steel liners, support plates, cover plates and crossbeam joint plates are flame cut by gantry cutting machines.

[0088] When the panel is cut by a CNC cutting machine, a cutting process is reserved in the length direction. After the stiffening ribs are welded, a semi-automatic trolley is used to flame cut the two short sides of the panel to ensure the overall outline size.

[0089] The vertical plate of each H-shaped stiffening rib is cut by a CNC cutting machine with a preset camber when blanking. When the bottom plate unit is assembled at one time, a special assembly tire frame is used as the outer tire and the H-shaped stiffening rib vertical plate is used as the inner tire to ensure the production line of the bottom plate unit;

[0090] S102: Remove the warping and wave deformation of the panel so that the flatness deviation of the panel does not exceed 1mm / 1m; perform top bending on the vertical plate and cover plate, and the plate rib height needs to be raised at multiple points to ensure smooth fitting, with the height deviation not exceeding 2mm; the details are as follows:

[0091] A hydraulic straightening machine is used to correct the warping and wave deformation of the panel. The flatness deviation of the panel is allowed to be no more than 1mm / 1m. A hydraulic bending machine is used to bend the vertical plate and cover plate. The plate rib height needs to be lifted at multiple points to ensure smooth fitting. The height deviation is allowed to be no more than 2mm to ensure that the panel flatness and longitudinal rib height meet the manufacturing requirements.

[0092] S103: Marking the bending lines of the vertical plates and the cover plates on the flat tire, and marking the horizontal reference lines on the panel;

[0093] S104: With the horizontal reference line as a reference, the panels are welded into the panel units; specifically, with the horizontal reference line as a reference, the panels are assembled into a whole, ensuring the straightness of the horizontal reference line, the longitudinal butt welds of the panel widths adopt a single-sided double-sided V-shaped welding groove, the allowable deviation of the assembly gap of the panels before welding does not exceed 0.5mm, and the misalignment in the thickness direction does not exceed 0.5mm; before welding, both sides of the butt weld are heated to the preheating temperature requirement by a flexible electromagnetic induction heating belt and a pre-deformation amount is set, solid wire CO2 gas shielded welding is used for base welding, and submerged arc automatic welding is used for filling and covering to complete the welding, solid wire G49A3C1S6 (φ1.2mm) is used as gas shielded welding material, and S49A4UFB-SU35H5 (φ5.0mm) welding wire and flux combination is used as submerged arc welding material;

[0094] S105: Correct the horizontal reference line based on the width dimension of the panel unit, and draw a vertical reference line perpendicular to the horizontal reference line. Then, based on the vertical and horizontal baselines, draw the assembly position lines of the two vertical panels and the bending line of the panel unit. The punching holes at both ends of the baseline must be no less than 50 mm from the panel edge.

[0095] S106: Bend the vertical plates, the cover plate, and the panel unit based on the bending lines of the two vertical plates, the bending line of the cover plate, and the bending line of the panel unit, with a bending radius deviation of no more than 2 mm.

[0096] In the step S1, a secondary flaw detection is also included. The first flaw detection is between step S104 and step S105, that is, the longitudinal butt welds between the panels are non-destructively tested using an ultrasonic testing method. If the test is qualified, step S105 is performed; otherwise, the process returns to step S104.

[0097] The second flaw detection is after step S106, i.e., the longitudinal butt weld within 150mm on both sides of the bending position line of the panel is subjected to radiographic inspection. If the inspection is qualified, step S2 is performed;

[0098] S2: Primary welding of plate element:

[0099] S201: Arrange multiple stays of different heights above the assembly frame, place the panel unit on the stays, and set weight blocks at the piers of the panel unit so that the back side of the panel unit is closely attached to the stays and fixed by spot welding; the details are as follows:

[0100] The panel unit is welded on a dedicated assembly jig. Struts of varying longitudinal elevations are arranged above the dedicated assembly jig, and weight blocks are provided at the piers of the panel unit. Under the restraining action of the weight blocks, the back side of the panel unit is closely attached to the lower struts and spot welded in place. The camber elevation is padded according to the linear shape of the panel unit, with an allowable deviation of +3 to +7 mm. The vertical plates are assembled along the longitudinal rib assembly position line, with a verticality requirement of no more than 1.0 mm between the vertical plates and the panel. The direction side, road centerline side, and arrow marks are then marked with a marker.

[0101] S202: Weld the vertical plate to the panel unit. The welds between the vertical plate and the panel unit are required to be grooved within the area 1.0m on both sides of the center line of the pier. The remaining area is required to be fillet welded. When the groove area of ​​the vertical plate transitions to the non-groove area, a transition slope of 1:5 is provided in the thickness direction of the vertical plate to ensure a smooth transition of the weld. The details are as follows:

[0102] The semi-automatic welding carriage is used in conjunction with flux-cored wire CO2 gas shielded welding to complete the welding of the fillet joints between the vertical plate and the panel;

[0103] S203: The fillet welds between the vertical plate and the panel are subjected to non-destructive testing using a magnetic particle testing method, and the groove fillet welds are subjected to non-destructive testing using an ultrasonic testing method. After passing the test, proceed to the next step;

[0104] S204: Remove the weight block and use flame baking to heat straighten the vertical plate. After straightening, the verticality deviation between the vertical plate and the panel shall not exceed 0.5mm.

[0105] S3: Secondary welding of plate elements:

[0106] S301: Divide the vertical plates, divide two adjacent vertical plates into one stiffening rib, and weld the stiffening rib. The specific steps of processing each stiffening rib are as follows: symmetrically weld multiple support plates on the inner sides of the two vertical plates, with the interval between two adjacent support plates not exceeding 1.5m; weld the cover plate between the two vertical plates, and use a semi-automatic welding trolley with flux-cored wire CO2 gas shielded welding to complete the groove fillet weld between the cover plate and the vertical plate;

[0107] S302: Perform non-destructive testing on the fillet weld between the cover plate and the vertical plate using ultrasonic testing. If the test is qualified, proceed to the next step;

[0108] S303: Clear the restraint weld between the panel and the frame support, check the linear shape of the panel unit in the free state, and thermally correct the panel unit by flame baking. After correction, the transverse flatness of the panel unit does not exceed 1mm / 1m, and the allowable deviation of the camber value along the bridge direction is 0~+5mm.

[0109] S304: Correcting the vertical and horizontal reference lines of the panel unit, and then drawing two short side cutting lines with the horizontal reference line according to the actual size of the panel unit.

[0110] S305: Reserving cutting margins for the two short sides of the panel unit to ensure the overall outline size of the panel unit;

[0111] S4: Three-step welding of plate elements:

[0112] S401: assembling the sealing plate and the steel liner in each stiffening rib in sequence, and assembling the joint plate based on the longitudinal and transverse reference lines;

[0113] S402: Welding the joint plate, sealing plate and steel liner to complete the processing, specifically, using solid wire CO2 gas shielded welding to complete the butt weld between the crossbeam joint plate and the bottom plate;

[0114] S403: Using ultrasonic testing to perform non-destructive testing on the butt weld between the beam joint plate and the panel, after passing the test, marking and flame cutting the arc portion of the joint plate to form the beam joint plate, wherein the arc radius is 200 mm.

[0115] In step S202 of this application, in order to ensure the quality of the butt welds of the bridge patch section, manual corner welding is performed at both ends of the weld between the vertical plate and the panel within a range of 100mm in the length direction using a 6mm weld angle and a 4mm weld angle in the plate thickness direction, and a 1:5 slope is used for smooth transition between the formal weld and the corner weld.

[0116] The non-destructive testing conducted in this application is qualified as long as it meets the general standards of the industry.

[0117] In order to ensure that there is sufficient probe scanning distance during ultrasonic testing of the butt weld between the beam joint plate and the panel, the beam joint plate is cut into rectangular pieces, and after the butt weld is tested and qualified, the beam joint plate arc is marked and flame cut, and the arc radius is 200mm.

[0118] This application utilizes optimized H-shaped stiffeners, which allow for a wider range of plate thickness options. Compared to existing U-ribs (which are only 6-12mm thick), these stiffeners can be constructed using medium-thick steel plates, meeting the high-load-bearing capacity requirements of the plate unit. Furthermore, compared to U-ribs, the H-shaped ribs in this application are more adaptable and can be used in steel beams with smaller flat curve radii, thus overcoming the limitation of U-ribs that cannot be manufactured in curved shapes.

[0119] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0120] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A method for manufacturing an H-shaped ribbed bottom plate unit of an ultra-wide broken-line steel-concrete composite beam, characterized in that: The ultra-wide broken-line steel-concrete composite beam H-shaped rib bottom plate unit includes: a panel unit, wherein the panel unit is a folded-line panel; a plurality of beam joint plates installed at intervals on one side of the panel unit; A plurality of H-shaped stiffening ribs are installed on the panel unit at intervals, and the stiffening ribs extend along the length direction of the panel unit; The stiffening ribs include: at least two vertical plates installed on the panel unit at intervals; At least one cover plate is disposed between the two vertical plates, and the bottom side of the cover plate, the inner wall of the vertical plate and the upper side of the panel unit are combined to form an assembly cavity; A plurality of support plates are installed at intervals on the inner wall of the assembly cavity, and the support plates are distributed along the length direction of the assembly cavity; At least two steel liners are respectively provided at both ends of the cover plate; At least two sealing plates are respectively arranged at two ends of the assembly cavity; There are at least eight steel liners and eight cover plates in each stiffening rib; The panel unit is formed by welding a plurality of panels; The production method comprises the following steps: S1: Processing of parts: S101: flame cutting the vertical plates, cover plates, support plates, steel liners and cover plates, cutting out welding grooves, and setting the camber of the vertical plates; S102: Remove the warping and wave deformation of the panel so that the flatness deviation of the panel does not exceed 1mm / 1m; perform top bending processing on the vertical plate and cover plate, and the plate rib height needs to be raised at multiple points to ensure smooth fitting, and the height deviation is not more than 2mm; S103: Marking the bending lines of the vertical plates and the cover plates on the flat tire, and marking the horizontal reference lines on the panel; S104: Welding the panels into panel units based on the horizontal reference line; S105: Correcting the horizontal reference line based on the width dimension of the panel unit, and drawing a vertical reference line perpendicular to the horizontal reference line, and then drawing the assembly position line of the vertical plate and the bending line of the panel unit based on the vertical and horizontal reference lines; S106: bending the vertical plate, the cover plate and the panel unit based on the bending lines of the vertical plate, the cover plate and the panel unit; S2: Primary welding of plate element: S201: Arrange multiple stays of different heights above the assembly frame, place the panel unit on the stays, and set weight blocks at the piers of the panel unit so that the back side of the panel unit is closely attached to the stays and fixed by spot welding; S202: Welding the vertical plate to the panel unit. The welds between the vertical plate and the panel unit are required to be grooved within a 1.0m area on both sides of the centerline of the pier. The remaining area is required to be fillet welded. When the groove area of ​​the vertical plate transitions to the non-groove area, a transition slope of 1:5 is provided in the thickness direction of the vertical plate to ensure a smooth transition of the weld. S3: Secondary welding of plate elements: S301: Divide the vertical plates, divide two adjacent vertical plates into one stiffening rib, and weld the stiffening rib. The specific steps of processing each stiffening rib are as follows: symmetrically weld multiple support plates on the inner sides of the two vertical plates, with the interval between two adjacent support plates not exceeding 1.5m, and weld the cover plate between the two vertical plates; S302: Perform non-destructive testing on the fillet weld between the cover plate and the vertical plate using ultrasonic testing. If the test is qualified, proceed to the next step; S4: Three-step welding of plate elements: S401: assembling the sealing plate and the steel liner in sequence, and assembling the joint plate based on the longitudinal and transverse reference lines; S402: Welding the joint plate, sealing plate and steel liner.

2. The production method according to claim 1, characterized in that The welding method of step S104 is as follows: before welding, both sides of the butt weld of the panel are heated to the preheating temperature requirement by a flexible electromagnetic induction heating belt and a pre-deformation amount is set, and a solid welding wire CO2 gas shielded welding base and submerged arc automatic welding filling and covering composite welding process are used to complete the welding, and the gas shielded welding welding material is a solid welding wire with a diameter of 1.2 mm, and the submerged arc welding material is a welding wire with a diameter of 5.0 mm.

3. The production method according to claim 2, characterized in that: The step S1 also includes a secondary flaw detection. The first flaw detection is between step S104 and step S105. That is, the longitudinal butt welds between the panels are non-destructively tested using an ultrasonic testing method. If the test is qualified, step S105 is performed. Otherwise, the process returns to step S104. The second flaw detection is performed after step S106, that is, the longitudinal butt welds within 150 mm on both sides of the bending position line of the panel are subjected to radiographic inspection. If the inspection is qualified, step S2 is performed.

4. The production method according to claim 3, characterized in that: The step S2 further includes step S203: a third flaw detection, wherein magnetic particle testing is used to perform non-destructive flaw detection on the fillet weld, and ultrasonic testing is used to perform non-destructive flaw detection on the groove fillet weld. If the test is qualified, the process proceeds to the next step; The fillet welds between the vertical plates and the panels are subjected to non-destructive testing using the magnetic particle testing method, and the groove fillet welds are subjected to non-destructive testing using the ultrasonic testing method. After passing the test, proceed to the next step.

5. The production method according to claim 4, characterized in that: The step S2 also includes a step S204: thermal correction, removing the weight block, and thermally correcting the vertical plate by flame baking. After correction, the verticality deviation between the vertical plate and the panel unit is allowed to be no more than 0.5 mm.

6. The manufacturing method according to claim 5, characterized in that: The welding method of step S301 is to use a semi-automatic welding trolley in conjunction with a flux-cored wire CO2 gas shielded welding method to complete the welding of the groove fillet weld between the cover plate and the vertical plate.

7. The production method according to claim 6, characterized in that: The step S3 further comprises the following steps: S303: Remove the restraint weld between the panel and the tire frame support bar, check the linear shape of the panel unit in the free state, and thermally correct the panel unit by flame baking. After correction, the transverse flatness of the panel unit does not exceed 1mm / 1m, and the allowable deviation of the camber value in the bridge direction is 0 to +5mm; S304: Correcting the longitudinal and transverse reference lines of the bottom plate unit, and then drawing two short side cutting lines with the transverse reference line according to the actual size of the bottom plate unit; S305: Reserving cutting allowances for the two short sides of the panel unit to ensure the overall outline size of the bottom plate unit.

8. The production method according to claim 7, characterized in that: The step S4 further comprises the following steps: S403: Using ultrasonic testing to perform non-destructive testing on the butt weld between the beam joint plate and the panel, after passing the test, marking and flame cutting the arc portion of the joint plate to form the beam joint plate, the arc radius of which is 200 mm.

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