Steel box girder for laminated continuous box girder bridge and manufacturing process

Abstract

The invention provides a steel box girder for a laminated continuous box girder bridge and a manufacturing process, and relates to the technical field of steel box girders, the steel box girder comprises a plurality of groups of top plate units connected in sequence and a plurality of groups of bottom plate units connected in sequence; the web units on the upper side are connected with the corresponding top plate units, and the web units on the lower side are connected with the corresponding bottom plate units; the frame type partition plate units are connected with the corresponding top plate units, the corresponding bottom plate units and the corresponding web plate units; and the symmetrical partition plate longitudinal beam units are respectively connected with the corresponding top plate units and the corresponding web plate units. Aiming at the defects in the prior art, the steel box girder for the laminated continuous box girder bridge and the manufacturing process are developed, error accumulation is reduced through modular units and a step-by-step process, the overall rigidity of the steel box girder is enhanced through V-shaped cross braces and frame type partition plates, and rapid positioning is achieved through special hoisting equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of steel box girders, and in particular to a steel box girder for a composite continuous box girder bridge and a manufacturing process therefor. Background Art

[0002] A composite continuous box girder bridge is a bridge structure that combines precast and cast-in-place processes, and has the characteristics of reasonable force, high construction efficiency, and good economy. A continuous girder bridge with integral force is formed by precast box girder segments (usually the top plate, bottom plate, and web) through a cast-in-place concrete composite layer and transverse connections.

[0003] A steel box girder is a main girder structure of a beam bridge with a box-shaped cross-section welded or bolted with steel, and has the characteristics of light self-weight, high strength, and fast construction. It is widely used in long-span bridges, urban interchanges, and bridges in special terrains. A closed box-shaped cross-section beam composed of a top plate, a bottom plate, a web, and stiffeners welded or bolted together, and the interior can be a cavity or filled with concrete (composite beam).

[0004] At present, there is still a lack of a steel box girder suitable for a composite continuous box girder bridge, which can reduce the cumulative error during the assembly process and facilitate the fabrication of the steel box girder.

[0005] Therefore, in view of the above problems, a steel box girder for a composite continuous box girder bridge and a manufacturing process therefor are proposed to solve the above problems. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention develops a steel box girder for a composite continuous box girder bridge and a manufacturing process therefor. The invention reduces the cumulative error through modular units and step-by-step processes, enhances the overall stiffness of the steel box girder by adopting V-shaped cross braces and frame-type diaphragms, and realizes rapid positioning by using special lifting equipment.

[0007] The technical solution for the present invention to solve the technical problems is as follows: The present invention provides a steel box girder for a composite continuous box girder bridge and a manufacturing process therefor, including: a plurality of groups of top plate units connected in sequence and a plurality of groups of bottom plate units connected in sequence; two groups of symmetric web units, the upper web unit being connected to the corresponding top plate unit, and the lower web unit being connected to the corresponding bottom plate unit; by means of the standardized sectional design of the top plate units, bottom plate units, and web units, the cumulative assembly error is reduced; a frame-type diaphragm unit, which is connected to the corresponding top plate unit, bottom plate unit, and web unit to enhance the overall stiffness and torsional resistance of the box girder, connects the top and bottom plates and the web to form a stable closed cross-section; symmetric diaphragm longitudinal beam units, which are respectively connected to the corresponding top plate unit and the corresponding web unit; symmetric cantilever diagonal braces, which are respectively connected to the corresponding web unit and the corresponding diaphragm longitudinal beam unit, and the diaphragm longitudinal beam unit and the cantilever diagonal brace optimize the local force, disperse the load in the cantilever area, and prevent stress concentration at the connection between the top plate and the web.

[0008] As an optimization, the top plate unit includes a top panel and a plurality of plate ribs, the plate ribs are connected to the top panel, the top and bottom plate unit includes a bottom panel and a plurality of U ribs, the U ribs are connected to the bottom panel, and the plate ribs and U ribs improve the flexural stiffness of the panel and prevent local buckling; the web unit includes a web, the web is connected to a group of web ribs and a group of vertical stiffeners to enhance the shear resistance of the web and avoid instability; each of the vertical stiffeners is respectively connected to the corresponding web rib, the framed diaphragm unit includes two upper and lower diaphragms, the two upper and lower diaphragms are respectively connected to a group of stiffeners, the two ends of the two upper and lower diaphragms are respectively connected to vertical diaphragms, the upper diaphragm is provided with notches matching a plurality of the plate ribs, the lower diaphragm is provided with notches matching a plurality of the U ribs to achieve rapid positioning and welding and reduce manual adjustment errors; the vertical diaphragm is provided with straight notches matching the web ribs, the diaphragm longitudinal beam unit includes a diaphragm and a longitudinal beam, the diaphragm is connected to the longitudinal beam, the diaphragm is connected to the corresponding top panel and the corresponding web, the longitudinal beam is connected to the corresponding top panel, the diaphragm is provided with notches matching a plurality of the plate ribs, the cantilever diagonal brace includes a side gusset plate, the gusset plate is connected to the diaphragm and the longitudinal beam, the gusset plate is connected to an I-shaped diagonal brace, and the I-shaped diagonal brace is connected to the corresponding web to transfer the cantilever load to the web and reduce the joint stress.

[0009] As an optimization, it further includes a V-shaped cross brace. The V-shaped cross brace includes an upper gusset plate, the upper gusset plate is connected to symmetric I-shaped members, the symmetric I-shaped members are respectively connected to lower gusset plates, the upper gusset plate is connected to the upper diaphragm, and the symmetric lower gusset plates are respectively connected to the corresponding vertical diaphragms and the lower diaphragm to form a space truss structure inside the box girder, further increasing the lateral stiffness and overall stability, especially suitable for the force requirements of long-span bridges.

[0010] As an optimization, the two ends of the top panel are respectively connected to side stiffening plates to strengthen the local stiffness of the top plate edge, prevent deformation during transportation or hoisting, and at the same time provide a support surface for the subsequent construction of the composite layer.

[0011] A manufacturing process for a steel box girder of a composite continuous box girder bridge includes the following steps: S1: Use equipment to place the middle bottom plate unit on the jig, align the longitudinal and transverse baselines with the jig reference lines, use a measuring tower to check the longitudinal baseline, and after passing the inspection, fix it to the jig. Taking the positioned middle bottom plate unit as the reference and the jig as the outer tire, assemble the left and right sides and the front and rear sides of the bottom plate unit; after the assembly dimension inspection is qualified, use code plates to code and weld. S2: With the horizontal baseline on the bottom plate as the reference, successively assemble the lower cross diaphragms of the framed diaphragm units at the bottom plate. Pay attention to controlling the fitting accuracy of the cross diaphragms with the bottom panel and U ribs, as well as the verticality of the cross diaphragms, the diaphragm spacing and other key points. After the positioning is qualified, fix it to the bottom plate unit by tack welding; S3: With the measuring tower and the horizontal baseline as the reference, assemble the V-shaped cross braces. Pay attention to controlling the longitudinal and transverse positions and the verticality of the V-shaped cross braces and other key points, and weld them to the lower cross diaphragms; S4: With the measuring tower and the horizontal baseline of the bottom plate as the reference, assemble the web unit and the vertical diaphragm. Pay attention to controlling the verticality of the web unit. After the positioning is qualified, weld the web to the vertical diaphragm, the bottom plate unit and the V-shaped cross braces; S5: With the measuring tower and the horizontal baseline as the reference, use a special hoisting device to assemble the middle top plate unit 1 and weld it to the relevant components; S6: Use a special hoisting device to assemble the top plate units on both sides and weld them to the relevant components. Use the device to assemble the diaphragm longitudinal beam unit in place and weld it to the top plate unit and the web; S7: With the main beam baseline as the reference, use the device to assemble the cantilever diagonal strut in place and weld it to the diaphragm, the longitudinal beam and the web.

[0012] As an optimization, the special hoisting device includes a hoisting support assembly and a magnetic attraction assembly. The hoisting support assembly includes an L-shaped support. Hooks are respectively connected to the four corners of the horizontal plate of the L-shaped support. The L-shaped support is connected to a mounting plate, and the mounting plate is detachably and fixedly connected to a support rod. As shown in the figure, the symmetric support rods are matched with the joints of the symmetric plate ribs and the top panel. By matching the positions of the plate ribs of the top plate unit through the L-shaped support and the support rod, the lossless positioning hoisting of the top plate unit is realized; the L-shaped support is connected to an L-shaped reference plate. When the top plate unit is hoisted in place, ensure that it is aligned with the adjacent top plate units on the left and right in the height direction and the front and back direction; the magnetic attraction assembly includes an electromagnet. The electromagnet is connected to a guiding round rod. The guiding round rod passes through the L-shaped support. The guiding round rod is connected to a mounting seat. The mounting seat is connected to a guiding rod. The guiding rod is arranged in a guiding cylinder. The guiding cylinder is connected to the L-shaped support through symmetric L-shaped mounting plates. Use the electromagnet to adsorb the top panel and cooperate with the support rod to realize smooth lifting and avoid hoisting deviation.

[0013] As an optimization, a tension spring is arranged in the guide cylinder, and the guide rod and the guide cylinder are respectively connected to one end of the tension spring. When the electromagnet is not energized, the tension spring is restored to drive the electromagnet to move upward for a certain distance. The L bracket is provided with a track groove, and the L bracket is connected to a symmetrical installation vertical rod. The symmetrical installation vertical rods are respectively rotatably connected to the main shaft, and the main shaft is connected to a symmetrical slide groove. A moving block is arranged in the track groove, and a guide cross bar is arranged in the track groove. The guide cross bar passes through the moving block, and the round blocks on both sides of the moving block are respectively nested in the corresponding slide grooves. The main shaft is connected to a stripping rod and a reset rod, and at least one end of the main shaft is connected to a driving gear, and at least one of the installation vertical rod bearings is connected to a driven gear. The driving gear meshes with the driven gear, the eccentric part of the driven gear and one of the mounting vertical rods are respectively rotationally connected to the spring column, the two spring columns are respectively connected to the retaining springs, the moving block is connected to the L axis, the L axis is rotationally connected to the symmetrical long connecting rods, the symmetrical long connecting rods are respectively rotationally connected to the moving block, the L bracket is connected to the symmetrical fixed guide seat, the symmetrical fixed guide seats are respectively fixedly connected to the guide short rods, the symmetrical guide short rods respectively pass through the corresponding moving blocks, the symmetrical moving blocks are respectively rotationally connected to the short connecting rods, the symmetrical short connecting rods are respectively rotationally connected to the square seats of the pins, the symmetrical pins respectively pass through the corresponding fixed guide seats, and the mounting seat is provided with positioning holes matching the symmetrical pins. The main shaft is connected to the stripping rod and the reset rod. When the pin is inserted into the positioning hole of the mounting seat, the stripping rod is vertical and the holding spring is in the first natural state. When the support rod is inserted into the junction of the plate rib and the top panel, the electromagnet contacts the top panel. After the support rod is in place, the electromagnet is controlled to be energized, which is convenient for hoisting the top panel unit. After the top panel unit is in place, the electromagnet is powered off, the stripping rod is swung, the pin is disengaged from the positioning hole of the mounting seat, the stripping rod is slowly released, and the holding spring changes from the first natural state to the second natural state. The reset rod is vertical, and the stretching spring is restored, so as to drive the electromagnet to move upward for a distance, which is convenient for fine-tuning the top panel unit and welding. After welding is completed, the electromagnet is energized, the electromagnet magnetically attracts the top panel, stretches the stretching spring, and swings the reset rod to change the holding spring from the second natural state to the first natural state, so that the pin is inserted into the positioning hole of the mounting seat to maintain the position of the electromagnet. After power failure, the equipment is operated to disengage the electromagnet and the support rod from the top panel unit, and then the next top panel unit is hoisted.

[0014] As an optimization, the L-shaped bracket is connected to a power assembly. The power assembly includes a motor and a positioning long rod. The L-shaped bracket is connected to the motor. The L-shaped bracket is connected to a screw rod through a bearing. The output shaft of the motor is connected to the screw rod. The screw rod passes through a first fixing seat. The screw rod is threadedly connected to a first moving seat. The first fixing seat is connected to the L-shaped bracket. The first fixing seat and the first moving seat are respectively rotatably connected to an L-shaped rod. The centers of the horizontal bars of the symmetric L-shaped rods are coaxially and cross-rotatably connected. The vertical round rods of the symmetric L-shaped rods are respectively rotatably connected to one end of a first connecting rod. The centers of the symmetric first connecting rods are coaxially and cross-rotatably connected. The other ends of the symmetric first connecting rods are respectively rotatably connected to one end of a second connecting rod. The centers of the symmetric second connecting rods are coaxially and cross-rotatably connected. The positioning long rod is connected to an outer guiding rod. The outer guiding rod passes through a second fixing seat and a second moving seat. The second fixing seat is connected to the positioning long rod. The other end of one second connecting rod is rotatably connected to the second fixing seat. The other end of the other second connecting rod is rotatably connected to the second moving seat. The positioning long rod is used to detect whether the top plate units in the front and rear directions are in the same horizontal plane. When the positioning long rod touches another top plate unit, it proves that the top plate units in the front and rear directions are in the same horizontal plane. The positioning long rod is connected to symmetric semi-circular blocks. The outer guiding rod passes through the front semi-circular block. The rear semi-circular block matches the peeling rod. The front semi-circular block matches the reset rod. The rotational movement of the screw rod is converted into the movement of the semi-circular block. When the semi-circular block touches the peeling rod or the reset rod, the pin is automatically disengaged from or inserted into the positioning hole of the mounting seat, controlling the timing of the peeling and reset actions and ensuring the reliability of the operation.

[0015] The effects provided in the invention content are only the effects of the embodiments, rather than all the effects of the invention. The above technical solutions have the following advantages or beneficial effects: 1. The present invention reduces error accumulation through modular units and step-by-step processes. Through the standardized segmented design of the top plate unit, bottom plate unit, and web unit, the accumulation of assembly errors is reduced; by adopting V-shaped cross braces and frame-type partitions, the overall stiffness of the steel box girder is enhanced. The frame-type partition unit enhances the overall stiffness and torsional resistance of the box girder, connects the top, bottom plates and webs to form a stable closed section; the partition longitudinal beam unit and the cantilever diagonal strut optimize the local stress, disperse the load in the cantilever area, and prevent stress concentration at the connection between the top plate and the web; the V-shaped cross braces form a space truss structure inside the box girder, further increasing the lateral stiffness and overall stability, especially suitable for the stress requirements of long-span bridges.

[0016] 2. The present invention uses a steel cable to connect the hook and the overhead crane. By operating the overhead crane, it realizes driving the special hoisting equipment to move in the height direction, front-back direction and left-right direction. By inserting the support rod into the joint of the plate rib and the top panel, and using the electromagnet to adsorb the top panel, it realizes smooth lifting and lowering, avoiding hoisting deviation. The rotational movement of the screw is converted into the movement of the semi-circular block. When the semi-circular block contacts the peeling rod or the reset rod, it realizes the automatic detachment or insertion of the pin into the positioning hole of the mounting seat. When the tension spring recovers, the electromagnet moves upward for a certain distance, facilitating the positioning long rod to move to the upper side of another top plate unit. By operating the overhead crane, when the positioning long rod and the L-reference plate contact the adjacent top plate unit at the same time, it proves that the top plate unit is hoisted in place, and the positioning long rod and the L-reference plate contacting the adjacent top plate unit at the same time also play a supporting role. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the steel box girder of the present invention.

[0019] Figure 2 It is a partial three-dimensional structural schematic diagram of the steel box girder of the present invention.

[0020] Figure 3 It is a three-dimensional structural schematic of the special hoisting equipment of the present invention Figure 1 .

[0021] Figure 4 It is a front view of the special hoisting equipment of the present invention hoisting the top plate unit.

[0022] Figure 5 It is a three-dimensional structural schematic of the special hoisting equipment of the present invention Figure 2 .

[0023] Figure 6 It is a partial sectional three-dimensional structural schematic diagram of the special hoisting equipment of the present invention.

[0024] Figure 7 For the present invention Figure 6 Partial enlarged view of A in.

[0025] Figure 8 It is a partial three-dimensional structural schematic diagram of the power component of the present invention.

[0026] Figure 9 It is a three-dimensional structural schematic diagram of the special hoisting equipment of the present invention hoisting the top plate unit.

[0027] In the figure: 1. Top plate unit, 11. Top panel, 12. Plate rib; 2. Diaphragm longitudinal beam unit, 21. Diaphragm, 22. Longitudinal beam; 3. Cantilever diagonal brace, 31. Side joint plate, 32. I-shaped diagonal brace; 4. Web unit, 41. Web, 42. Web rib, 43. Vertical stiffener; 5. V-shaped cross brace, 51. Upper joint plate, 52. I-shaped member, 53. Lower joint plate; 6. Frame diaphragm unit, 61. Cross diaphragm, 62. Stiffening, 63. Straight notch, 64. Vertical diaphragm; 7. Bottom plate unit, 71. Bottom plate, 72. U-rib; 8. Lifting support assembly, 81. Hook, 82. L-shaped bracket, 83. Mounting plate, 84. Support rod, 85. L-shaped reference plate, 86. Track groove, 87. Guide cross bar, 88. Fixed guide seat, 89. Guide short bar, 810. Mounting vertical bar; 9. Magnetic attraction assembly, 91. Guide cylinder, 92. L-shaped mounting plate, 93. Long connecting rod, 94. L-shaped shaft, 95. Chute, 96. Moving block, 97. Spring column, 98. Holding spring, 99. Driven gear, 910. Main shaft, 911. Driving gear, 912. Stripping rod, 913. Reset rod, 914. Electromagnet, 915. Guide round bar, 916. Pin, 917. Moving square block, 918. Short connecting rod, 919. Mounting seat, 920. Tensile spring, 921. Guide rod; 10. Power assembly, 101. Motor, 102. Screw, 103. First moving seat, 104. L-shaped rod, 105. First fixed seat, 106. First connecting rod, 107. Second connecting rod, 108. Positioning long rod, 109. Semi-circular block, 1010. Outer guide rod, 1011. Second moving seat, 1012. Second fixed seat. Detailed implementation mode

[0028] In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with its accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. The present invention omits the description of well-known components, processing technologies and processes to avoid unnecessarily limiting the present invention. The orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] As Figures 1 to 2 shown, a steel box girder for a composite continuous box girder bridge includes: a plurality of groups of top plate units 1 connected in sequence and a plurality of groups of bottom plate units 7 connected in sequence; two groups of symmetric web units 4, the upper web unit 4 is connected to the corresponding top plate unit 1, and the lower web unit 4 is connected to the corresponding bottom plate unit 7; through the standardized sectional design of the top plate unit 1, the bottom plate unit 7, and the web unit 4, the accumulation of assembly errors is reduced; a frame-type diaphragm unit 6, which connects the corresponding top plate unit 1, the bottom plate unit 7, and the web unit 4, enhances the overall stiffness and torsional resistance of the box girder, connects the top and bottom plates and the webs to form a stable closed section; symmetric diaphragm longitudinal beam units 2, which are respectively connected to the corresponding top plate unit 1 and the corresponding web unit 4; symmetric cantilever diagonal braces 3, which are respectively connected to the corresponding web unit 4 and the corresponding diaphragm longitudinal beam unit 2, and the diaphragm longitudinal beam unit 2 and the cantilever diagonal brace 3 optimize the local stress, disperse the load in the cantilever area, and prevent stress concentration at the connection between the top plate and the web.

[0030] The top plate unit 1 includes a top plate 11 and a number of plate ribs 12. The plate ribs 12 are connected to the top plate 11. The top and bottom plate unit 7 includes a bottom plate 71 and a number of U-shaped ribs 72. The U-shaped ribs 72 are connected to the bottom plate 71. The plate ribs 12 and the U-shaped ribs 72 improve the flexural stiffness of the panel and prevent local buckling. The web unit 4 includes a web 41. The web 41 is connected to a group of web ribs 42 and a group of vertical stiffeners 43 to enhance the shear resistance of the web 41 and avoid instability. Each of the vertical stiffeners 43 is respectively connected to the corresponding web rib 42. The framed diaphragm unit 6 includes two upper and lower cross diaphragms 61. The two upper and lower cross diaphragms 61 are respectively connected to a group of stiffeners 62. The two ends of the two upper and lower cross diaphragms 61 are respectively connected to vertical diaphragms 64. The upper cross diaphragm 61 is provided with notches matching a number of the plate ribs 12. The lower cross diaphragm 61 is provided with notches matching a number of the U-shaped ribs 72 to achieve rapid positioning and welding and reduce manual adjustment errors. The vertical diaphragm 64 is provided with straight notches 63 matching the web ribs 42. The diaphragm longitudinal beam unit 2 includes a diaphragm 21 and a longitudinal beam 22. The diaphragm 21 is connected to the longitudinal beam 22. The diaphragm 21 is connected to the corresponding top plate 11 and the corresponding web 41. The longitudinal beam 22 is connected to the corresponding top plate 11. The diaphragm 21 is provided with notches matching a number of the plate ribs 12. The cantilever diagonal brace 3 includes a side gusset plate 31. The gusset plate 31 is connected to the diaphragm 21 and the longitudinal beam 22. The gusset plate 31 is connected to an I-shaped diagonal brace 32. The I-shaped diagonal brace 32 is connected to the corresponding web 41 to transfer the cantilever load to the web 41 and reduce the joint stress.

[0031] It further includes a V-shaped cross brace 5. The V-shaped cross brace 5 includes an upper gusset plate 51. The upper gusset plate 51 is connected to symmetric I-shaped members 52. The symmetric I-shaped members 52 are respectively connected to lower gusset plates 53. The upper gusset plate 51 is connected to the upper cross diaphragm 61. The symmetric lower gusset plates 53 are respectively connected to the corresponding vertical diaphragms 64 and the lower cross diaphragm 61 to form a space truss structure inside the box girder, further increasing the lateral stiffness and overall stability, especially suitable for the force requirements of long-span bridges.

[0032] Both ends of the top plate 11 are respectively connected to side stiffening plates 13 to strengthen the local stiffness of the top plate edge, prevent deformation during transportation or hoisting, and at the same time provide a support surface for the subsequent construction of the composite layer.

[0033] A manufacturing process for a steel box girder of a composite continuous box girder bridge includes the following steps: S1: Use equipment to place the middle bottom plate unit 7 on the jig, align the longitudinal and transverse baselines with the jig reference lines, use the measuring tower to check the longitudinal baseline, and after passing the inspection, fix it to the jig. Taking the positioned middle bottom plate unit 7 as the reference and the jig as the outer tire, assemble the bottom plate units 7 on the left and right sides and the front and back sides; after the assembly dimensions are inspected and qualified, use code plates to code, fix and weld. S2: Taking the transverse baseline on the bottom plate as the reference, sequentially assemble the lower transverse diaphragms 61 of the frame - type diaphragm unit 6 at the bottom plate. Pay attention to controlling the matching accuracy between the transverse diaphragm 61 and the bottom panel 71 and the U - rib 72, as well as the verticality of the transverse diaphragm 61, the diaphragm spacing and other key points. After positioning is qualified, fix it to the bottom plate unit 7 by tack welding. S3: Taking the measuring tower and the transverse baseline as the reference, assemble the V - type cross brace 5. Pay attention to controlling the longitudinal and transverse positions and the verticality of the V - type cross brace 5 and other key points, and weld it to the lower transverse diaphragm 61. S4: Taking the measuring tower and the transverse baseline of the bottom plate as the reference, assemble the web unit 4 and the vertical diaphragm 64. Pay attention to controlling the verticality of the web unit 4. After positioning is qualified, weld the web 41 to the vertical diaphragm 64, the bottom plate unit 7 and the V - type cross brace 5. S5: Taking the measuring tower and the transverse baseline as the reference, use special lifting equipment to assemble the middle top plate unit 1 and weld it to the relevant components. S6: Use special lifting equipment to assemble the top plate units 1 on both sides and weld them to the relevant components. Use equipment to assemble the diaphragm longitudinal beam unit 2 in place and weld it to the top plate unit 1 and the web 41. S7: Taking the main beam baseline as the reference, use equipment to assemble the cantilever diagonal strut 3 in place and weld it to the diaphragm 21, the longitudinal beam 22 and the web 41.

[0034] As Figures 3 to 9 shown, the special lifting equipment includes a lifting support assembly 8 and a magnetic attraction assembly 9. The lifting support assembly 8 includes an L - shaped support 82. Hooks 81 are respectively connected to the four corners of the horizontal plate of the L - shaped support 82. The L - shaped support 82 is connected to a mounting plate 83. The mounting plate 83 is detachably and fixedly connected to a support rod 84. As Figure 4As shown, the symmetric support rods 84 match the joints of the symmetric plate ribs 12 and the top panel 11. The positions of the plate ribs 12 of the top plate unit 1 are matched by the L brackets 82 and the support rods 84, realizing the lossless positioning and hoisting of the top plate unit 1. The L bracket 82 is connected to the L reference plate 85. When the top plate unit 1 is hoisted in place, it is ensured to be aligned with the adjacent top plate units 1 in the height direction and the front-back direction. The magnetic attraction assembly 9 includes an electromagnet 914. The electromagnet 914 is connected to a guiding round rod 915. The guiding round rod 915 passes through the L bracket 82. The guiding round rod 915 is connected to a mounting seat 919. The mounting seat 919 is connected to a guiding rod 921. The guiding rod 921 is arranged in a guiding cylinder 91. The guiding cylinder 91 is connected to the L bracket 82 through symmetric L mounting plates 92. By using the electromagnet 914 to adsorb the top panel 11 and cooperating with the support rod 84, smooth lifting is realized, avoiding hoisting deviation.

[0035] Embodiment 1: The guiding rod 921 is connected to the guiding cylinder 91.

[0036] The working process of this embodiment is as follows: Use a steel cable to connect the hook 81 and the overhead crane. By operating the overhead crane, the special hoisting equipment is driven to move in the height direction, the front-back direction, and the left-right direction.

[0037] When welding the steel box girder, it includes the top plate units 1 in the front-back direction and the left-right direction.

[0038] When hoisting the top plate unit 1, operate the overhead crane to make the symmetric support rods 84 match the joints of the symmetric plate ribs 12 and the top panel 11. Operate the overhead crane to insert the support rods 84 into the joints of the symmetric plate ribs 12 and the top panel 11, and the electromagnet 914 contacts the top panel 11. Energize the electromagnet 914 to make the electromagnet 914 magnetically attract the top plate unit 1. Operate the overhead crane to hoist the top plate unit 1 in place for welding.

[0039] Embodiment 2: A tension spring 920 is arranged inside the guide cylinder 91. One end of the tension spring 920 is respectively connected to the guide rod 921 and the guide cylinder 91. When the electromagnet 914 is not powered on and the tension spring 920 resumes, it drives the electromagnet 914 to move upward by a certain distance. The L-shaped bracket 82 is provided with a track groove 86. The L-shaped bracket 82 is connected to symmetric mounting vertical rods 810. The symmetric mounting vertical rods 810 are respectively rotatably connected to the main shaft 910. The main shaft 910 is connected to symmetric sliding grooves 95. A moving block 96 is arranged in the track groove 86. A guide cross bar 87 is arranged in the track groove 86. The guide cross bar 87 passes through the moving block 96. The circular blocks on both sides of the moving block 96 are respectively nested in the corresponding sliding grooves 95. The main shaft 910 is connected to a peeling rod 912 and a reset rod 913. At least one end of the main shaft 910 is connected to a driving gear 911. At least one of the mounting vertical rods 810 is connected to a driven gear 99 through a bearing. The driving gear 911 meshes with the driven gear 99. The eccentric part of the driven gear 99 and one of the mounting vertical rods 810 are respectively rotatably connected to a spring column 97. The two spring columns 97 are respectively connected to a holding spring 98. The moving block 96 is connected to an L-shaped shaft 94. The L-shaped shaft 94 is rotatably connected to symmetric long connecting rods 93. The symmetric long connecting rods 93 are respectively rotatably connected to a moving square block 917. The L-shaped bracket 82 is connected to symmetric fixed guide seats 88. The symmetric fixed guide seats 88 are respectively fixedly connected to guide short rods 89. The symmetric guide short rods 89 respectively pass through the corresponding moving square blocks 917. The symmetric moving square blocks 917 are respectively rotatably connected to short connecting rods 918. The symmetric short connecting rods 918 are respectively rotatably connected to the square seats of pins 916. The symmetric pins 916 respectively pass through the corresponding fixed guide seats 88. The mounting seat 919 is provided with positioning holes matching the symmetric pins 916.The main shaft 910 is connected to the stripping rod 912 and the reset rod 913. When the pin 916 is inserted into the positioning hole of the mounting seat 919, the stripping rod 912 is vertical, and the spring 98 is maintained in the first natural state. When the support rod 84 is inserted into the joint of the plate rib 12 and the top panel 11, the electromagnet 914 contacts the top panel 11. After the support rod 84 is in place, the electromagnet 914 is controlled to be energized to facilitate the hoisting of the top plate unit 1. After the top plate unit 1 is in place, the electromagnet 914 is de-energized, the stripping rod 912 is swung, so that the pin 916 is disengaged from the positioning hole of the mounting seat 919, and the stripping rod 912 is slowly released, keeping the spring 98 changing from the first natural state to the second natural state, and the reset rod 913 is vertical, and the tension spring 920 is restored, realizing driving the electromagnet 914 to move upward for a certain distance to facilitate the fine adjustment of the top plate unit 1 and facilitate welding. After welding is completed, the electromagnet 914 is energized, the electromagnet 914 magnetically attracts the top panel 11, stretches the tension spring 920, swings the reset rod 913, so that the holding spring 98 changes from the second natural state to the first natural state, and the pin 916 is inserted into the positioning hole of the mounting seat 919 to realize the position holding of the electromagnet 914. After power-off, the equipment is operated to disengage the electromagnet 914 and the support rod 84 from the top plate unit 1, and then the next top plate unit 1 is hoisted.

[0040] The working process of this embodiment is as follows: In the initial state, the pin 916 is inserted into the positioning hole of the mounting seat 919, the stripping rod 912 is vertical, and the special hoisting equipment hoists the top plate unit 1 in place. The stripping rod 912 is swung manually to one side, the stripping rod 912 drives the main shaft 910 to rotate, the main shaft 910 drives the reset rod 913 to swing, the main shaft 910 drives the driving gear 911 to rotate, the driving gear 911 drives the driven gear 99 to rotate, the driven gear 99 drives a spring column 97 to swing, a spring column 97 drives the holding spring 98 to swing, the holding spring 98 drives another spring column 97 to rotate, the main shaft 910 drives the chute 95 to swing, the chute 95 drives the moving block 96 to move along the guiding cross bar 87 in the track groove 86, the moving block 96 drives the L shaft 94 to move, the L shaft 94 drives the long connecting rod 93 to swing, the long connecting rod 93 drives the moving square 917 to move along the guiding short rod 89, the moving square 917 drives the short connecting rod 918 to swing, and the short connecting rod 918 drives the pin 916 to move, so that it is disengaged from the positioning hole of the mounting seat 919. The electromagnet 914 is de-energized, and the tension spring 920 is restored, overcoming the gravity of the electromagnet 914 etc., so that the electromagnet 914 is far away from the top plate unit 1, facilitating the fine adjustment of the position of the top plate unit 1 and facilitating subsequent welding.

[0041] Embodiment 3: This embodiment is further elaborated on the basis of Embodiment 2. The L-shaped bracket 82 is connected to the power assembly 10. The power assembly 10 includes a motor 101 and a positioning long rod 108. The L-shaped bracket 82 is connected to the motor 101. The L-shaped bracket 82 is connected to the screw rod 102 by a bearing. The output shaft of the motor 101 is connected to the screw rod 102. The screw rod 102 passes through the first fixed seat 105. The screw rod 102 is threadedly connected to the first moving seat 103. The first fixed seat 105 is connected to the L-shaped bracket 82. The first fixed seat 105 and the first moving seat 103 are respectively rotatably connected to the L-shaped rod 104. The centers of the horizontal bars of the symmetric L-shaped rods 104 are rotatably connected coaxially and crosswise. The vertical round rods of the symmetric L-shaped rods 104 are respectively rotatably connected to one end of the first connecting rod 106. The centers of the symmetric first connecting rods 106 are rotatably connected coaxially and crosswise. The other ends of the symmetric first connecting rods 106 are respectively rotatably connected to one end of the second connecting rod 107. The centers of the symmetric second connecting rods 107 are rotatably connected coaxially and crosswise. The positioning long rod 108 is connected to the outer guide rod 1010. The outer guide rod 1010 passes through the second fixed seat 1012 and the second moving seat 1011. The second fixed seat 1012 is connected to the positioning long rod 108. One end of the other second connecting rod 107 is rotatably connected to the second fixed seat 1012. The other end of the other second connecting rod 107 is rotatably connected to the second moving seat 1011. The positioning long rod 108 is used to detect whether the top plate units 1 in the front and rear directions are in the same horizontal plane. When the positioning long rod 108 touches another top plate unit 1, it proves that the top plate units 1 in the front and rear directions are in the same horizontal plane. The positioning long rod 108 is connected to symmetric semi-circular blocks 109. The outer guide rod 1010 passes through the front semi-circular block 109. The rear semi-circular block 109 matches the peeling rod 912. The front semi-circular block 109 matches the reset rod 913. The rotational movement of the screw rod 102 is converted into the movement of the semi-circular block 109. When the semi-circular block 109 touches the peeling rod 912 or the reset rod 913, the pin 916 is automatically disengaged from or inserted into the positioning hole of the mounting seat 919, controlling the timing of the peeling and reset actions and ensuring the reliability of the operation.

[0042] The working process of this embodiment is as follows: In the initial state, the pin 916 is inserted into the positioning hole of the mounting base 919, and the positioning long rod 108 is close to the motor 101. The top plate unit 1 is hoisted in place to contact the adjacent top plate unit 1. The electromagnet 914 is powered off, and the motor 101 is controlled to rotate. The motor 101 drives the screw rod 102 to rotate, the screw rod 102 drives the first moving seat 103 to move, the first moving seat 103 drives the L-shaped rod 104 to swing, the L-shaped rod 104 drives the first connecting rod 106 to rotate, the first connecting rod 106 drives the second connecting rod 107 to swing, the second connecting rod 107 drives the second fixed seat 1012, the second moving seat 1011, the outer guiding rod 1010, the positioning long rod 108 and the semi-circular block 109 to move. The second connecting rod 107 drives the second moving seat 1011 to move along the outer guiding rod 1010. The rear semi-circular block 109 contacts the peeling rod 912 and then drives it to swing, so that the tension spring 920 is restored, overcoming the gravity of the electromagnet 914 etc., making the electromagnet 914 away from the top plate unit 1, the reset rod 913 is vertical, and the positioning long rod 108 moves to the upper side of another top plate 11. When the top plate 11 contacts the positioning long rod 108, it proves that the two are flush, which is convenient for subsequent welding. After the welding is completed, the motor 101 is controlled to rotate in the reverse direction, the semi-circular block 109 leaves the area of the electromagnet 914, the electromagnet 914 is powered on, making it attract the top plate 11, the front semi-circular block 109 contacts the reset rod 913, making it swing, making the peeling rod 912 vertical, and making the pin 916 inserted into the positioning hole of the mounting base 919.

[0043] The present invention reduces the error accumulation through modular units and step-by-step processes. Through the standardized segmented design of the top plate unit 1, the bottom plate unit 7, and the web unit 4, the accumulation of assembly errors is reduced; by adopting V-shaped cross braces and frame-type partitions to enhance the overall stiffness of the steel box girder, the frame-type partition unit 6 enhances the overall stiffness and torsional resistance of the box girder, connecting the top, bottom plates and webs to form a stable closed section; the partition longitudinal beam unit 2 and the cantilever diagonal strut 3 optimize the local stress, disperse the load in the cantilever area, and prevent stress concentration at the connection between the top plate and the web; the V-shaped cross brace 5 forms a space truss structure inside the box girder, further increasing the lateral stiffness and overall stability, which is especially suitable for the stress requirements of long-span bridges.

[0044] The present invention uses a steel cable to connect the hook 81 and the overhead crane. By operating the overhead crane, it is realized to drive the special hoisting equipment to move in the height direction, the front-back direction and the left-right direction. The support rod 84 is inserted into the joint of the slab rib 12 and the top panel 11, and the top panel 11 is adsorbed by the electromagnet 914 to realize stable lifting and avoid hoisting deviation. The rotational movement of the screw 102 is converted into the movement of the semi-circular block 109. When the semi-circular block 109 contacts the peeling rod 912 or the reset rod 913, the pin 916 is automatically disengaged or inserted into the positioning hole of the mounting seat 919. When the tension spring 920 returns, the electromagnet 914 moves upward for a certain distance, which facilitates the positioning long rod 108 to move to the upper side of another roof slab unit 1. By operating the overhead crane, when the positioning long rod 108 and the L reference plate 85 simultaneously contact the adjacent roof slab unit 1, it is proved that the roof slab unit 1 is hoisted in place, and the simultaneous contact of the positioning long rod 108 and the L reference plate 85 with the adjacent roof slab unit 1 also plays a supporting role.

[0045] Although the specific embodiments of the invention are described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present invention. Based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A steel box girder for a composite continuous box girder bridge, characterized in that Comprising: A number of groups of top plate units (1) connected in sequence and a number of groups of bottom plate units (7) connected in sequence; Two groups of symmetric web units (4), the upper web unit (4) being connected to the corresponding top plate unit (1), and the lower web unit (4) being connected to the corresponding bottom plate unit (7); A frame-type partition unit (6) connecting the corresponding top plate unit (1), bottom plate unit (7) and web unit (4); Symmetric partition longitudinal beam units (2) respectively connecting the corresponding top plate unit (1) and the corresponding web unit (4); Symmetric cantilever diagonal braces (3) respectively connecting the corresponding web unit (4) and the corresponding partition longitudinal beam unit (2).

2. The steel box girder for a composite continuous box girder bridge according to claim 1, characterized in that: The top plate unit (1) includes a top panel (11) and a number of plate ribs (12), the plate ribs (12) connecting the top panel (11), the top and bottom plate unit (7) includes a bottom panel (71) and a number of U ribs (72), the U ribs (72) connecting the bottom panel (71), the web unit (4) includes a web (41), the web (41) connecting a group of web ribs (42) and a group of vertical stiffeners (43), each vertical stiffener (43) respectively connecting the corresponding web rib (42), the frame-type partition unit (6) includes upper and lower cross partitions (61), the upper and lower cross partitions (61) respectively connecting a group of stiffeners (62), the two ends of the upper and lower cross partitions (61) respectively connecting vertical partitions (64), the upper cross partition (61) being provided with notches matching the number of plate ribs (12), the lower cross partition (61) being provided with notches matching the number of dry U ribs (72), the vertical partition (64) being provided with straight notches (63) matching the web ribs (42), the partition longitudinal beam unit (2) includes a partition (21) and a longitudinal beam (22), the partition (21) connecting the longitudinal beam (22), the partition (21) connecting the corresponding top panel (11) and the corresponding web (41), the longitudinal beam (22) connecting the corresponding top panel (11), the partition (21) being provided with notches matching the number of plate ribs (12), the cantilever diagonal brace (3) includes a side gusset plate (31), the gusset plate (31) connecting the partition (21) and the longitudinal beam (22), the gusset plate (31) connecting an I-shaped diagonal brace (32), the I-shaped diagonal brace (32) connecting the corresponding web (41).

3. The steel box girder for a composite continuous box girder bridge according to claim 2, wherein: Further comprising A V-shaped cross brace (5), the V-shaped cross brace (5) including an upper gusset plate (51), the upper gusset plate (51) connecting symmetric I-shaped members (52), the symmetric I-shaped members (52) respectively connecting a lower gusset plate (53), the upper gusset plate (51) connecting the upper cross partition (61), the symmetric lower gusset plates (53) respectively connecting the corresponding vertical partitions (64) and the lower cross partition (61).

4. A steel box girder for a composite continuous box girder bridge according to claim 2, characterized in that: Both ends of the top panel (11) are respectively connected to side stiffening plates (13).

5. The manufacturing process of a steel box girder for a composite continuous box girder bridge according to claim 3, characterized in that, Comprising the following steps: S1: Use the equipment to place the middle bottom plate unit (7) on the jig. Taking the positioned middle bottom plate unit (7) as the reference, assemble the left and right sides and the front and rear sides of the bottom plate unit (7) on the jig for the outer tire assembly; after the assembly dimension inspection is qualified, fix and weld with the code plate. S2: Taking the horizontal baseline on the bottom plate as the reference, sequentially assemble the lower horizontal partition (61) of the frame-type partition unit (6) at the bottom plate, and position and weld it to the bottom plate unit (7). S3: Taking the measuring tower and the horizontal baseline as the reference, assemble the V-shaped horizontal brace (5) and weld it to the lower horizontal partition (61). S4: Taking the measuring tower and the bottom plate horizontal baseline as the reference, assemble the web unit (4) and the vertical partition (64), and weld the web (41) to the vertical partition (64), the bottom plate unit (7), and the V-shaped horizontal brace (5). S5: Taking the measuring tower and the horizontal baseline as the reference, use the special lifting equipment to assemble the middle top plate unit (1) and weld it to the relevant components. S6: Use the special lifting equipment to assemble the top plate units (1) on both sides and weld them to the relevant components. Use the equipment to assemble the partition longitudinal beam unit (2) in place and weld it to the top plate unit (1) and the web (41). S7: Taking the main beam baseline as the reference, use the equipment to assemble the cantilever diagonal brace (3) in place and weld it to the partition (21), the longitudinal beam (22), and the web (41).

6. The manufacturing process according to claim 5, characterized in that: The special lifting equipment includes a lifting bracket assembly (8) and a magnetic attraction assembly (9). The lifting bracket assembly (8) includes an L bracket (82). The L bracket (82) is connected to the mounting plate (83). The mounting plate (83) is detachably and fixedly connected to the support rod (84). The L bracket (82) is connected to the L reference plate (85). The magnetic attraction assembly (9) includes an electromagnet (914). The electromagnet (914) is connected to the guiding round rod (915). The guiding round rod (915) passes through the L bracket (82). The guiding round rod (915) is connected to the mounting seat (919). The mounting seat (919) is connected to the guiding rod (921). The guiding rod (921) is arranged in the guiding cylinder (91). The guiding cylinder (91) is connected to the L bracket (82) through the symmetric L mounting plates (92).

7. The manufacturing process according to claim 6, characterized in that: A tension spring (920) is arranged inside the guide cylinder (91). One end of the tension spring (920) is respectively connected to the guide rod (921) and the guide cylinder (91). The L-shaped bracket (82) is provided with a track groove (86). The L-shaped bracket (82) is connected to symmetric mounting vertical rods (810). The symmetric mounting vertical rods (810) are respectively rotatably connected to the main shaft (910). The main shaft (910) is connected to symmetric sliding grooves (95). A moving block (96) is arranged in the track groove (86). The two circular blocks on both sides of the moving block (96) are respectively nested in the corresponding sliding grooves (95). The main shaft (910) is connected to a peeling rod (912) and a reset rod (913). At least one end of the main shaft (910) is connected to a driving gear (911). At least one of the mounting vertical rods (810) is connected to a driven gear (99) through a bearing. The driving gear (911) meshes with the driven gear (99). The eccentric part of the driven gear (99) and one of the mounting vertical rods (810) are respectively rotatably connected to a spring column (97). The two spring columns (97) are respectively connected to a holding spring (98). The moving block (96) is connected to an L-shaped shaft (94). The L-shaped shaft (94) is rotatably connected to symmetric long connecting rods (93). The symmetric long connecting rods (93) are respectively rotatably connected to a moving square block (917). The L-shaped bracket (82) is connected to symmetric fixed guide seats (88). The symmetric fixed guide seats (88) are respectively fixedly connected to guide short rods (89). The symmetric guide short rods (89) respectively pass through the corresponding moving square blocks (917). The symmetric moving square blocks (917) are respectively rotatably connected to short connecting rods (918). The symmetric short connecting rods (918) are respectively rotatably connected to the square seats of pins (916). The symmetric pins (916) respectively pass through the corresponding fixed guide seats (88). The mounting seat (919) is provided with positioning holes matching the symmetric pins (916).

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