Steel plate composite beams and construction methods

Abstract

This invention relates to a steel plate composite beam and its construction method. The main beam splicing utilizes an assembly-type steel beam jig; the precast bridge deck reinforcement binding utilizes an assembly-type reinforcement jig; a detachable bridge deck rapid formwork system is employed; a precise positioning auxiliary device for the precast bridge deck is included; a positioning device for the wet joint reinforcement is provided; an epoxy mortar precise laying device is provided; and a self-made epoxy mortar squeegee is used for rapid application. The beneficial effects of this invention are: the assembly-type steel beam jig facilitates on-site assembly; the main beams are spaced within the steel beam positioning grooves of the lateral limiting columns, improving the assembly efficiency and accuracy of the steel beams; the use of transverse and longitudinal comb plates to position the reinforcement spacing effectively reduces the difficulty of binding the precast bridge deck reinforcement; the precast bridge deck positioning auxiliary device improves the positioning accuracy of the precast bridge deck; and the epoxy mortar laying device effectively improves the accuracy and efficiency of epoxy mortar laying.

Description

Technical Field

[0001] This invention relates to a bridge construction system, and more particularly to a steel plate composite beam and its construction method. Background Technology

[0002] With social and economic development, standardized, prefabricated, and information-based construction technologies have become the preferred choice for civil buildings and transportation infrastructure construction. In the bridge sector, rapid bridge construction technology based on prefabrication and assembly is a construction method for small and medium-span bridges. Steel plate composite beams are composite beams formed by combining prefabricated bridge deck panels and I-beams. Steel plate composite beam structures help save construction time, improve mechanization and factory production, and accelerate construction progress. However, the construction of steel plate composite beams also presents many challenges, such as the difficulty of splicing steel beams, the difficulty of positioning rebar in wet joints, the low reusability of prefabricated bridge deck formwork systems, and the low positioning accuracy of prefabricated bridge deck panels. These issues necessitate strict control and improvement of the steel plate composite beam construction process.

[0003] In summary, for steel plate composite beam construction systems, a steel plate composite beam and its construction method that features fast construction speed, high reusability of the formwork system, and high accuracy in the placement of precast bridge decks is currently of great importance. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a steel plate composite beam and its construction method.

[0005] This type of steel plate composite beam includes: a modular steel beam assembly jig, a modular steel bar jig, a detachable bridge deck rapid formwork system, a precast bridge deck precise placement auxiliary device, a wet joint steel bar setting and positioning device, an epoxy mortar precise laying device, and an epoxy mortar leveling trowel.

[0006] The modular steel beam assembly jig includes lateral limiting posts; the lateral limiting posts are located on both sides of the modular steel beam assembly jig, and the lateral limiting posts are provided with steel beam limiting grooves;

[0007] The modular steel reinforcement frame includes transverse comb plates and longitudinal comb plates. The transverse comb plates are provided with steel reinforcement limiting grooves. Longitudinal comb plates are provided between the transverse comb plates, and the longitudinal comb plates are also provided with steel reinforcement limiting grooves.

[0008] The detachable bridge deck rapid formwork system includes a transverse comb plate, a flat bottom mold, end molds, and wedge-shaped adjustment blocks. The transverse comb plate and end molds are located around the flat bottom mold, and wedge-shaped adjustment blocks are welded on top of the flat bottom mold.

[0009] The precast bridge deck precision placement auxiliary device includes a limiting groove and a guide channel steel. The limiting groove is fixedly connected to the main beam; the guide channel steel is fixedly connected to the precast bridge deck.

[0010] The positioning device for the reinforcing bars in the wet joint includes upper and lower slotted connecting plates; the upper and lower slotted connecting plates are connected to a pressure plate by a temporary fixing hook; the upper and lower slotted connecting plates are provided with upper layer reinforcing bar limiting holes and lower layer reinforcing bar limiting holes.

[0011] Preferably, the assembled steel beam jig further includes a vertical support, a horizontal support, an oblique support, a right-angle connector, an oblique brace fixing plate, a support arm base, and fixing bolts; the support arm base is welded to the bottom of the vertical support and connected to the ground by fixing bolts; the vertical support and the horizontal support are fixed by a right-angle connector, which is equipped with fixing bolts; an oblique support is also provided between the vertical support and the horizontal support for reinforcement, and both ends of the oblique support are fixed to the vertical support and the horizontal support by oblique brace fixing plates; the lateral limiting post is fixed to the horizontal support by a right-angle connector.

[0012] Preferably, the assembled steel reinforcement frame further includes supporting columns, longitudinal comb plate fixing grooves, transverse supports, frame base plates, longitudinal fixing plates, and slots; the frame base plates are symmetrically arranged on the left and right sides, and are reinforced by transverse supports; supporting columns are provided between the frame base plates and the transverse comb plates, and the supporting columns are fixed by right-angle connectors, which are equipped with fixing bolts; the transverse comb plates are provided with longitudinal comb plate fixing grooves, and the longitudinal comb plate fixing grooves on the left and right sides are symmetrically arranged, and the left and right sides of the transverse comb plates are connected by longitudinal fixing plates; the longitudinal comb plates are also provided with slots, and the longitudinal comb plates are fixedly connected to the longitudinal comb plate fixing grooves using the slots.

[0013] As a preferred embodiment, the detachable bridge deck rapid formwork system further includes diagonal bracing plates, fixing bolts, bottom formwork vertical supports, bottom formwork lateral supports, and bottom formwork diagonal braces; the bottom of the flat bottom formwork is fixed to the ground by the bottom formwork vertical supports, and the bottom of the transverse comb plate is connected and fixed to the flat bottom formwork by fixing bolts; the bottom of the end formwork is connected and fixed to the flat bottom formwork by fixing bolts; the transverse comb plate and the flat bottom formwork are reinforcedly connected by the bottom formwork lateral supports and bottom formwork diagonal braces, and diagonal bracing plates are welded to both ends of the bottom formwork diagonal braces, and the diagonal bracing plates are connected to the transverse comb plate or the bottom formwork lateral supports by fixing bolts.

[0014] As a preferred embodiment, the precast bridge deck precise positioning auxiliary device further comprises fixing bolts, a vertical limiting plate, a first fixing connecting plate, and a horizontal limiting plate; the vertical limiting plate is symmetrically arranged at both ends of the horizontal limiting plate, and a limiting groove is provided in the middle of the horizontal limiting plate; a first fixing connecting plate is welded to one side of the vertical limiting plate, and the first fixing connecting plate is connected to the main beam by fixing bolts; a guide channel steel is fixedly connected to the precast bridge deck by fixing bolts, and the guide channel steel is located in the limiting groove.

[0015] As a preferred embodiment, the positioning device for the wet joint reinforcement also includes a pre-reserved hook hole; a temporary fixing hook is installed on the upper and lower slotted connecting plates through the pre-reserved hook hole, and the upper end of the temporary fixing hook is connected to the pressure plate; the top and bottom of the upper and lower slotted connecting plates are respectively provided with upper layer reinforcement limiting holes and lower layer reinforcement limiting holes.

[0016] As a preferred embodiment, the epoxy mortar precision laying device includes a displacement adjusting shaft, a slide rail, a slider, a slide rail support column, a channel steel right-angle connector, epoxy mortar, and a slide rail fixing plate; the slide rail support column is symmetrically arranged on the left and right sides, and a channel steel right-angle connector is provided at the lower end of the slide rail support column, which is connected to the crossbeam by fixing bolts; the slide rail fixing plate is fixed to the slide rail support column by bolts, and a slide rail is provided on the slide rail fixing plate; displacement adjusting shafts are arranged at intervals on the slide rail, and the displacement adjusting shafts are connected to the slide rail by sliders.

[0017] Preferably, the epoxy mortar scraper includes an epoxy mortar storage tank, a blade, an epoxy mortar outlet, an epoxy mortar delivery pipe, a valve connecting rod, a valve opening / closing plate, a valve, a handle, and a support plate. A handle is welded to one side of the support plate, and an epoxy mortar storage tank is located above the support plate, containing epoxy mortar. The upper end of the epoxy mortar delivery pipe is connected to the bottom of the epoxy mortar storage tank, and the lower end is flush with the blade. A valve opening / closing plate is located inside the epoxy mortar delivery pipe, connected to the valve via the valve connecting rod. The angle of the valve opening / closing plate changes accordingly when the valve is rotated.

[0018] The construction method for this type of steel plate composite beam includes the following steps:

[0019] Step 1: Assemble the steel plate composite beams using a modular steel beam assembly jig: Install the modular steel beam assembly jig, with the main beams spaced apart in the steel beam limiting grooves of the lateral limiting columns; weld crossbeams between adjacent main beams to assemble the steel plate composite beams;

[0020] Step 2, Steel Plate Composite Beam Erection Construction: The single longitudinal beam is hoisted one by one across the entire span using a truck crane. The hoisting sequence of the longitudinal beams of the steel plate composite beam is: inner edge beam, middle beam, middle beam, outer edge beam.

[0021] Step 3, Rebar Binding: Install the assembled rebar jig, use the transverse and longitudinal comb plates to position the rebar spacing, and bind the rebar of the precast bridge deck.

[0022] Step 4: Reinforcing steel cage placement and bridge deck pouring: After installing the detachable bridge deck formwork system, align and lower the transverse reinforcing bars and transverse comb plates to place the reinforcing steel cage into the formwork; then pour the precast bridge deck.

[0023] Step 5, Epoxy Mortar Laying: Install the epoxy mortar laying device, use the slider to adjust the position of the displacement adjustment shaft to achieve precise laying of epoxy mortar; use an epoxy mortar screed to assist in spreading; regulate the delivery of epoxy mortar through the valve;

[0024] Step Six: Precise Positioning of Bridge Deck: Using a prefabricated bridge deck precise positioning auxiliary device, the guide channel steel is positioned into the limiting groove by hoisting the bridge deck.

[0025] Step 7, Wet Joint Construction: Install the wet joint reinforcement and set up the positioning device. After the wet joint reinforcement is positioned, the wet joint formwork is fixed with steel cables and pressure plates before pouring concrete.

[0026] As a preferred option, in step seven: bamboo plywood is used as the bottom formwork for the wet joint; plastic sleeves are provided on the steel cables; and second fixed connecting plates are provided at both ends of the pressure plate; pre-embedded positioning plates are provided on the precast bridge deck, and pre-embedded rods are provided on the pre-embedded positioning plates; the pre-embedded positioning plates are connected to the second fixed connecting plates by fixing bolts; after the steel reinforcement and formwork have passed inspection, concrete is poured; concrete is poured using a truck crane with a hopper, and an immersion vibrator is used, vibrating from the perimeter to the center, with fast insertion and slow withdrawal; after the concrete construction is completed, it is covered with a plastic film.

[0027] The beneficial effects of this invention are:

[0028] 1) The present invention sets up a modular steel beam assembly jig, which is convenient for on-site assembly. The main beams are arranged at intervals in the steel beam limiting grooves of the lateral limiting columns, which improves the assembly efficiency and accuracy of the steel beams.

[0029] 2) The present invention sets up a modular steel reinforcement frame, and uses transverse comb plates and longitudinal comb plates to position the spacing of the steel reinforcement, which effectively reduces the difficulty of binding the steel reinforcement of the precast bridge deck.

[0030] 3) The present invention adopts a detachable bridge deck rapid formwork system, with transverse comb plates and end molds set around the bottom mold of the flat plate, and wedge-shaped adjustment blocks welded on the top of the bottom mold of the flat plate, which improves the prefabrication efficiency of the variable cross-section bridge deck.

[0031] 4) The present invention provides a precast bridge deck placement auxiliary device, which is equipped with matching guide channel steel and limiting groove, thereby improving the placement accuracy of the precast bridge deck.

[0032] 5) The present invention provides a wet joint reinforcement positioning device, which effectively reduces the difficulty of installing wet joint reinforcement by using upper and lower slotted connecting plates with upper reinforcement limiting holes and lower reinforcement limiting holes respectively at the upper and lower ends.

[0033] 6) The present invention is equipped with an epoxy mortar laying device, which uses a slider to adjust the position of the displacement adjustment shaft to achieve precise laying of epoxy mortar, effectively improving the accuracy and efficiency of epoxy mortar laying.

[0034] 7) This invention uses a self-made epoxy mortar trowel, which regulates the delivery of epoxy mortar through a valve and is equipped with a blade that is flush with the lower end of the epoxy mortar delivery pipe, which can greatly improve the epoxy mortar application speed. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a modular steel beam assembly frame structure;

[0036] Figure 2 This is a schematic diagram of the steel beam assembly structure;

[0037] Figure 3 This is a schematic diagram of the completed steel beam assembly structure;

[0038] Figure 4 This is a schematic diagram of a modular steel frame structure;

[0039] Figure 5 This is a schematic diagram of the longitudinal comb plate structure;

[0040] Figure 6 This is a schematic diagram of the detachable bridge deck rapid formwork system architecture;

[0041] Figure 7 This is a schematic diagram of the prefabricated bridge deck installation structure;

[0042] Figure 8 This is a schematic diagram of the prefabricated bridge deck placement auxiliary device.

[0043] Figure 9 This is a schematic diagram of the construction structure for wet joints;

[0044] Figure 10 This is a schematic diagram of the structure of the wet joint rebar positioning device;

[0045] Figure 11 This is a schematic diagram of a cable structure;

[0046] Figure 12 This is a schematic diagram of the anchoring of the pre-embedded positioning plate and the fixed connecting parts;

[0047] Figure 13 This is a schematic diagram of an epoxy mortar laying device.

[0048] Figure 14 This is a schematic diagram of a homemade epoxy mortar leveling tool.

[0049] In the diagram: 1-Assembled steel beam jig, 2-Vertical support of the jig, 3-Horizontal support of the jig, 4-Diagonal support of the jig, 5-Steel beam limiting groove, 6-Right-angle connector, 7-Diagonal brace fixing plate, 8-Bracket base frame, 9-Fixing bolt, 10-Lateral limiting column, 11-Shear stud, 12-Vertical stiffening rib, 13-Main beam, 14-Horizontal beam, 15-Assembled steel reinforcement jig, 16-Support column, 17-Horizontal comb plate, 1 8-Longitudinal comb plate fixing groove, 19-Transverse support, 20-Rebar limiting groove, 21-Frame base plate, 22-Longitudinal fixing plate, 23-Longitudinal comb plate, 24-Slot, 25-Flat bottom formwork, 26-Bottom formwork vertical support, 27-Bottom formwork lateral support, 28-Bottom formwork diagonal brace, 29-End formwork, 30-Wedge-shaped adjusting block, 31-Vertical limiting plate, 32-Limiting groove, 33-First fixed connecting plate, 34-Transverse limiting plate 35-Guide channel steel, 36-Precast bridge deck, 37-Embedded wet joint reinforcement, 38-Pressure plate, 39-Steel cable, 40-Temporary fixing steel hook, 41-Bottom layer reinforcement, 42-Upper layer reinforcement, 43-Plastic sleeve, 44-Wet joint bottom surface template, 45-Upper and lower slotted connecting plates, 46-Second fixing connecting plate, 47-Upper layer reinforcement limiting hole, 48-Reserved hook hole, 49-Bottom layer reinforcement limiting hole, 50-Embedded Positioning plate, 51-Embedded rod, 52-Displacement adjustment shaft, 53-Slide rail, 54-Slider, 55-Slide rail support column, 56-Channel steel right-angle connector, 57-Epoxy mortar, 58-Slide rail fixing plate, 59-Epoxy mortar storage tank, 60-Blade, 61-Epoxy mortar outlet, 62-Epoxy mortar conveying pipe, 63-Valve connecting rod, 64-Valve opening and closing plate, 65-Valve, 66-Handle, 67-Support plate. Detailed Implementation

[0050] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0051] Example 1

[0052] As one example, such as Figures 1 to 14As shown, this steel plate composite beam system includes: 1. Assembled steel beam assembly jig; 2. Vertical jig support; 3. Lateral jig support; 4. Diagonal jig support; 5. Steel beam limiting groove; 6. Right-angle connector; 7. Diagonal brace fixing plate; 8. Support arm base frame; 9. Fixing bolts; 10. Lateral limiting column; 11. Shear nail; 12. Vertical stiffening rib; 13. Main beam; 14. Crossbeam; 15. Assembled steel reinforcement jig; 16. Support column; 17. Lateral comb plate; 18. Longitudinal comb plate fixing groove; 19. Lateral support; 10. Steel reinforcement limiting. 20. Groove 21. Base plate of the formwork frame 22. Longitudinal fixing plate 23. Longitudinal comb plate 24. Slot 25. Flat bottom mold 26. Vertical support of bottom mold 27. Lateral support of bottom mold 28. Diagonal brace of bottom mold 29. End mold 30. Wedge-shaped adjusting block 30. Vertical limiting plate 31. Limiting groove 32. First fixed connecting plate 33. Lateral limiting plate 34. Guide channel steel 35. Precast bridge deck 36. Embedded wet joint reinforcement 37. Pressure plate 38. Steel cable 39. Temporary fixing steel hook 40. Bottom layer reinforcement 41. Upper 42. Reinforcing steel bar; 43. Plastic sleeve; 44. Wet joint bottom template; 45. Upper and lower slotted connecting plates; 46. Second fixed connecting plate; 47. Upper reinforcing steel bar limiting hole; 48. Reserved hook hole; 49. Bottom reinforcing steel bar limiting hole; 50. Embedded positioning plate; 51. Embedded rod; 52. Displacement adjustment shaft; 53. Slide rail; 54. Slide rail support column; 55. Channel steel right angle connector; 56. Epoxy mortar; 57. Slide rail fixing plate; 58. Epoxy mortar storage tank; 59. Blade; 60. Epoxy mortar outlet; 61. Epoxy mortar delivery pipe 62, valve connecting rod 63, valve opening and closing plate 64, valve 65, handle 66, support plate 67; main beam 13 is spliced ​​using assembly-type steel beam assembly jig 1; precast bridge deck 36 reinforcement is tied using assembly-type reinforcement jig 15; a detachable bridge deck rapid formwork system is adopted; a precast bridge deck 36 precise placement auxiliary device is set; a positioning device is set for wet joint reinforcement; an epoxy mortar 57 precise laying device is set; a self-made epoxy mortar trowel is used for rapid application.

[0053] The assembled steel beam jig 1 consists of a vertical support 2, a horizontal support 3, an oblique support 4, a steel beam limiting groove 5, a right-angle connector 6, an oblique brace fixing plate 7, a support arm base 8, fixing bolts 9, and a lateral limiting column 10. The support arm base 8 is welded to the bottom of the vertical support 2 and is connected to the ground by fixing bolts 9. The vertical support 2 and the horizontal support 3 are fixed by right-angle connectors 6, which are equipped with fixing bolts 9. An oblique support 4 is also provided between the vertical support 2 and the horizontal support 3 for reinforcement. The oblique support 4 is welded to both ends of the oblique support 4 and fixed to the vertical support 2 and the horizontal support 3, respectively. The lateral limiting column 10 is provided with a steel beam limiting groove 5 and is fixed to the horizontal support 3 by right-angle connectors 6.

[0054] The assembled rebar frame 15 comprises a support column 16, a transverse comb plate 17, a longitudinal comb plate fixing groove 18, a transverse support 19, a rebar limiting groove 20, a frame base plate 21, a longitudinal fixing plate 22, a longitudinal comb plate 23, and a locking groove 24. The frame base plate 21 is symmetrically arranged on the left and right sides and is reinforced by the transverse support 19. The transverse comb plate 17 is provided with a rebar limiting groove 20. The support column 16 is provided between the frame base plate 21 and the transverse comb plate 17 and is fixed by a right-angle connector 6, which is provided with a fixing bolt 9. The transverse comb plate 17 is provided with a longitudinal comb plate fixing groove 18, which is symmetrically arranged on the left and right sides and is reinforced by the longitudinal fixing plate 22. The longitudinal comb plate 23 is provided with a rebar limiting groove 20 and a locking groove 24, which are fixedly connected to the longitudinal comb plate fixing groove 18 by means of the locking groove 24.

[0055] The detachable bridge deck rapid formwork system comprises a diagonal brace fixing plate 7, fixing bolts 9, a transverse comb plate 17, a flat bottom mold 25, a bottom mold vertical support 26, a bottom mold lateral support 27, a bottom mold diagonal brace 28, an end mold 29, and a wedge-shaped adjusting block 30. The bottom mold vertical support 26 is fixed to the ground below the flat bottom mold 25, and a wedge-shaped adjusting block 30 is welded above it. The transverse comb plate 17 is fixed to the flat bottom mold 25 via the bottom fixing bolts 9. The end mold 29 is fixed to the flat bottom mold 25 via the bottom fixing bolts 9. The transverse comb plate 17 and the flat bottom mold 25 are reinforced with the bottom mold lateral support 27 and the bottom mold diagonal brace 28. Diagonal brace fixing plates 7 are welded to both ends of the bottom mold diagonal brace 28, and are connected to the transverse comb plate 17 and the bottom mold lateral support 27 via fixing bolts 9.

[0056] The aforementioned precast bridge deck precise positioning auxiliary device consists of fixing bolts 9, vertical limiting plates 31, limiting grooves 32, a first fixed connecting plate 33, a transverse limiting plate 34, and a guide channel steel 35. The vertical limiting plates 31 and transverse limiting plates 34 are welded together and are symmetrically arranged on the left and right sides, with a limiting groove 32 in the middle. The first fixed connecting plate 33 is welded to one side of the vertical limiting plate 31 and connected to the main beam 13 by fixing bolts 9. The guide channel steel 35 is fixedly connected to the precast bridge deck 36 by fixing bolts 9, and the precast bridge deck 36 is precisely positioned by the guide channel steel 35 positioning in the limiting groove 32.

[0057] The aforementioned positioning device for wet joint reinforcement consists of a temporary fixing steel hook 40, an upper and lower slotted connecting plate 45, an upper reinforcement limiting hole 47, a reserved hook hole 48, and a bottom reinforcement limiting hole 49. The upper and lower slotted connecting plate 45 is provided with a reserved hook hole 48 for installing the temporary fixing steel hook 40, which is connected to the pressure plate 38. The upper reinforcement limiting hole 47 and the bottom reinforcement limiting hole 49 are respectively provided at the top and bottom of the upper and lower slotted connecting plate 45 to achieve precise positioning of the wet joint reinforcement.

[0058] The epoxy mortar 57 precision laying device consists of a displacement adjusting shaft 52, a slide rail 53, a slider 54, a slide rail support column 55, a channel steel right-angle connector 56, epoxy mortar 57, and a slide rail fixing plate 58. The slide rail support column 55 is symmetrically arranged on the left and right sides, and the lower end is provided with a channel steel right-angle connector 56 connected to the crossbeam 14 by fixing bolts 9. The slide rail fixing plate 58 is fixed to the slide rail support column 55 by bolts, and the slide rail 53 is installed on it. The displacement adjusting shaft 52 is arranged at intervals on the slide rail and is connected to the slide rail 53 by the slider 54. The position of the displacement adjusting shaft 52 is adjusted by the slider 54 to achieve precise laying of epoxy mortar 57.

[0059] The epoxy mortar leveling blade consists of an epoxy mortar storage tank 59, a blade 60, an epoxy mortar outlet 61, an epoxy mortar delivery pipe 62, a valve connecting rod 63, a valve opening / closing plate 64, a valve 65, a handle 66, and a support plate 67. The handle 66 is welded to the right side of the support plate 67, and the epoxy mortar storage tank 59 is located above it to store epoxy mortar 57. The upper end of the epoxy mortar delivery pipe 62 is connected to the bottom of the epoxy mortar storage tank 59, and the lower end is flush with the blade 60. A valve opening / closing plate 64 is installed inside the epoxy mortar delivery pipe 62, connected to the valve 65 via the valve connecting rod 63. By rotating the valve 65, the angle of the valve opening / closing plate 64 is adjusted to achieve the delivery of epoxy mortar 57.

[0060] Example 2

[0061] As another embodiment, this embodiment provides a construction method for the steel plate composite beam described in Embodiment 1, and its main construction steps are as follows:

[0062] Step 1: Steel beam transportation: After the steel structure unit components are manufactured in the factory, they are transported by road to the bridge erection site, where the steel beams are assembled, extended, and installed on the modular steel beam assembly jig 1.

[0063] Installation of the modular steel beam assembly jig: The modular steel beam assembly jig 1 consists of a vertical support 2, a horizontal support 3, an oblique support 4, a steel beam limiting groove 5, a right-angle connector 6, an oblique brace fixing plate 7, a support arm base 8, fixing bolts 9, and a lateral limiting post 10. The support arm base 8 is welded to the bottom of the vertical support 2 and is connected to the ground by fixing bolts 9. The vertical support 2 and the horizontal support 3 are fixed by right-angle connectors 6, which are equipped with fixing bolts 9. An oblique support 4 is also provided between the vertical support 2 and the horizontal support 3 for reinforcement. The oblique support 4 is welded to both ends of the oblique support 4 and fixed to the vertical support 2 and the horizontal support 3. The lateral limiting post 10 is equipped with a steel beam limiting groove 5 and is fixed to the horizontal support 3 by right-angle connectors 6. The precast main beam 13 is provided with vertical stiffening ribs 12 and shear studs 11. The main beam 13 is arranged at intervals in the steel beam limiting grooves 5 of the lateral limiting columns 10. A crossbeam 14 is welded between adjacent main beams 13.

[0064] Step 2, Steel Plate Composite Beam Erection Construction: After the steel plate composite beams are assembled on site, they are hoisted one by one across the entire span using a truck crane. The hoisting sequence of the longitudinal beams of the steel plate composite beams is: inner edge beam → middle beam → middle beam → outer edge beam.

[0065] Step 3: Installation of the modular rebar jig: The modular rebar jig 15 consists of support columns 16, transverse comb plates 17, longitudinal comb plate fixing grooves 18, transverse supports 19, rebar limiting grooves 20, jig base plate 21, longitudinal fixing plates 22, longitudinal comb plates 23, and slots 24; the jig base plate 21 is symmetrically arranged on the left and right sides and is reinforced by the transverse supports 19; the transverse comb plates 17 are provided with rebar limiting grooves 20; support columns 16 are provided between the jig base plate 21 and the transverse comb plates 17 and are fixed by right-angle connectors 6, which are provided with fixing bolts 9; the transverse comb plates 17 are provided with longitudinal comb plate fixing grooves 18, which are symmetrically arranged on the left and right sides and are reinforced by the longitudinal fixing plates 22; the longitudinal comb plates 23 are provided with rebar limiting grooves 20 and slots 24, which are fixedly connected to the longitudinal comb plate fixing grooves 18 using the slots 24.

[0066] Rebar binding: After the assembly-type rebar jig 15 is installed, the spacing of the rebars is positioned using the comb plate, and the rebars of the precast bridge deck 36 are bound. The binding of the rebars must meet the construction requirements of the bridge.

[0067] Step 4: Fabrication and Installation of the Demountable Bridge Deck Formwork System: The demountable bridge deck rapid formwork system is a combination of a flat bottom formwork 25, wedge-shaped adjusting blocks 30, comb plates, and end formwork 29. The dimensions of the precast bridge deck 36 are changed by adjusting the positions of the wedge-shaped adjusting blocks 30 and end formwork 29 according to the drawings. The demountable bridge deck rapid formwork system has a vertical support 26 fixed to the ground below the flat bottom formwork 25, with wedge-shaped adjusting blocks 30 welded above it. The horizontal comb plate 17 is connected and fixed to the flat bottom formwork 25 via bottom fixing bolts 9. The end formwork 29 is also connected and fixed to the flat bottom formwork 25 via bottom fixing bolts 9. A bottom formwork lateral support 27 and a bottom formwork diagonal brace 28 are installed between the horizontal comb plate 17 and the flat bottom formwork 25 for reinforcement. Diagonal brace fixing plates 7 are welded to both ends of the bottom formwork diagonal brace 28, and connected to the horizontal comb plate 17 and the bottom formwork lateral support 27 via fixing bolts 9.

[0068] Reinforcing bar cage placement: After the reinforcing bars are tied, a special reinforcing bar hoisting tool is used to slowly lift them to the top of the formwork. The position is adjusted to align the gaps between the transverse reinforcing bars and the comb plate. Then the reinforcing bars are slowly lowered to allow the reinforcing bar cage to slowly enter the formwork. If there are any conflicts between the reinforcing bars and the formwork during the placement process, the spacing of some reinforcing bars should be adjusted in time to allow them to enter the formwork smoothly, and then the original position should be restored. After the formwork is completed, the transverse prestressed ducts are installed.

[0069] Bridge deck concrete pouring and curing: To ensure the internal and external quality of the precast bridge deck concrete (36mm), a Φ30 vibrator is used to compact the concrete below the corrugated pipe, and a Φ50 vibrator is used above the corrugated pipe. The vibrator must not collide with the formwork, corrugated pipe, or other embedded parts. Concrete curing adopts a surface-covered, water-spraying method to maintain moisture.

[0070] Tensioning and grouting: The steel strands are tensioned in a staggered manner at one end, and the tensioning is carried out in a staggered manner at one end, with gradual loading in stages; before grouting, the ducts are cleaned with an air compressor, and grouting is carried out with intelligent grouting equipment. Grouting of the same duct should be carried out continuously and completed in one go.

[0071] Step 5, Epoxy Mortar Laying: When laying epoxy mortar 57, install the epoxy mortar laying device, which consists of displacement adjusting shaft 52, slide rail 53, slider 54, slide rail support column 55, channel steel right-angle connector 56, epoxy mortar 57, and slide rail fixing plate 58. The slide rail support column 55 is symmetrically arranged on the left and right sides, and the lower end is equipped with channel steel right-angle connector 56, which is connected to the crossbeam 14 by fixing bolts 9. The slide rail fixing plate 58 is fixed to the slide rail support column 55 by bolts, and the slide rail 53 is installed on it. Displacement adjusting shafts 52 are arranged at intervals on the slide rail, and are connected to the slide rail 53 by sliders 54. The position of the displacement adjusting shafts 52 is adjusted by sliders 54 to achieve precise laying of epoxy mortar 57. When laying epoxy mortar 57, a self-made epoxy mortar screed is used to spread it evenly. The angle of the valve opening and closing plate 64 is adjusted by rotating the valve 65 set on the epoxy mortar screed to achieve the conveying of epoxy mortar 57.

[0072] Step Six: Precast Bridge Panel Installation: The precast bridge panel 36 is installed using a precise positioning auxiliary device, which consists of fixing bolts 9, vertical limiting plates 31, limiting grooves 32, a first fixed connecting plate 33, a transverse limiting plate 34, and a guide channel steel 35. The vertical limiting plates 31 and transverse limiting plates 34 are welded together and are symmetrically arranged on the left and right sides, with a limiting groove 32 in the middle. The first fixed connecting plate 33 is welded to one side of the vertical limiting plate 31 and connected to the main beam 13 by fixing bolts 9. The guide channel steel 35 is fixedly connected to the precast bridge panel 36 by fixing bolts 9, and the guide channel steel 35 is positioned in the limiting groove 32. The precast bridge panel 36 is then lifted by a crane to achieve precise positioning of the precast bridge panel 36.

[0073] Step 7, Wet Joint Construction: After the precast bridge deck 36 is in place, wet joint construction begins. A positioning device is installed during the binding of the wet joint reinforcement, consisting of temporary fixing steel hooks 40, upper and lower slotted connecting plates 45, upper reinforcement limiting holes 47, reserved hook holes 48, and lower reinforcement limiting holes 49. The upper and lower slotted connecting plates 45 have reserved hook holes 48 for installing the temporary fixing steel hooks 40, which are connected to the pressure plate 38. The upper and lower slotted connecting plates 45 have upper reinforcement limiting holes 47 and lower reinforcement limiting holes 49 at their top and bottom, respectively, to achieve precise positioning of the wet joint reinforcement. The wet joint template uses bamboo plywood as the bottom mold, fixed by steel cables 39 and pressure plates 38. The steel cables 39 have plastic sleeves 43, and the pressure plates 38 have second fixing connecting plates 46 at both ends. Pre-embedded positioning plates 50 are installed on the precast bridge deck 36, and pre-embedded inserts 51 are installed on the pre-embedded positioning plates 50, which are connected to the second fixing connecting plates 46 by fixing bolts 9. After the reinforcing steel and formwork have passed inspection, concrete pouring can begin. Concrete is poured using a truck crane with a hopper, and an immersion vibrator is used, first around the perimeter and then the center, ensuring quick insertion and slow withdrawal to avoid over-vibration and under-vibration. After the concrete is poured, it is immediately covered with a plastic film to lock in moisture and prevent early shrinkage and cracking.

Claims

1. A steel plate composite beam characterized by, The utility model relates to a prefabricated bridge construction technology, and particularly relates to a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The prefabricated bridge construction technology comprises a prefabricated bridge construction technology, which comprises the following: The pref The epoxy mortar scraping knife comprises an epoxy mortar storage tank (59), a blade (60), an epoxy mortar output port (61), an epoxy mortar conveying pipe (62), a valve connecting rod (63), a valve opening and closing plate (64), a valve (65), a handle (66) and a supporting plate (67).

2. The steel plate girder according to claim 1, wherein: The assembly type steel beam assembling jig (1) further comprises a jig vertical support (2), a jig horizontal support (3), a jig inclined support (4), a right-angle connecting piece (6), an inclined support fixing plate (7), a supporting arm base frame (8) and a fixing bolt (9).

3. The steel plate girder according to claim 1, wherein: The assembly type steel beam assembling jig (1) further comprises a jig vertical support (2), a jig horizontal support (3), a jig inclined support (4), a right-angle connecting piece (6), an inclined support fixing plate (7), a supporting arm base frame (8) and a fixing bolt (9).

4. The steel plate girder according to claim 1, wherein: The detachable bridge deck formwork rapid supporting system further comprises an inclined brace fixing plate (7), a fixing bolt (9), a bottom form vertical support (26), a bottom form lateral support (27) and a bottom form inclined brace (28); the flat plate bottom form (25) is fixed to the ground through the bottom form vertical support (26) below; the bottom of the transverse comb plate (17) is connected and fixed to the flat plate bottom form (25) through the fixing bolt (9); the bottom of the end form (29) is connected and fixed to the flat plate bottom form (25) through the fixing bolt (9); the transverse comb plate (17) and the flat plate bottom form (25) are connected and strengthened through the bottom form lateral support (27) and the bottom form inclined brace (28); the two ends of the bottom form inclined brace (28) are respectively welded with the inclined brace fixing plate (7), and the inclined brace fixing plate (7) is connected to the transverse comb plate (17) or the bottom form lateral support (27) through the fixing bolt (9).

5. The steel plate girder according to claim 1, wherein: The prefabricated bridge deck precise positioning auxiliary device further comprises a fixing bolt (9), a vertical limiting plate (31), a first fixed connecting plate (33) and a horizontal limiting plate (34); the vertical limiting plate (31) is symmetrically arranged at the two ends of the horizontal limiting plate (34); the horizontal limiting plate (34) is provided with a limiting groove (32) in the middle; the first fixed connecting plate (33) is welded on one side of the vertical limiting plate (31); the first fixed connecting plate (33) is connected to the main beam (13) through the fixing bolt (9); the prefabricated bridge deck (36) is fixedly connected to the guide channel steel (35) through the fixing bolt (9), and the guide channel steel (35) is positioned in the limiting groove (32).

6. The steel plate girder according to claim 1, wherein: The wet joint steel bar positioning device further comprises a reserved hook hole (48); the temporary fixing hook (40) is mounted on the upper and lower slotted connecting plate (45) through the reserved hook hole (48), and the upper end of the temporary fixing hook (40) is connected to the pressing plate (38); the upper and lower slotted connecting plate (45) is respectively provided with an upper layer steel bar limiting hole (47) and a bottom layer steel bar limiting hole (49) at the top and the bottom.

7. The construction method of a steel plate composite beam according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: Step one, steel plate composite beam assembly by using the assembly type steel beam assembly jig: install the assembly type steel beam assembly jig (1), and the main beams (13) are arranged in the steel beam limiting grooves (5) of the lateral limiting columns (10) at intervals; weld the cross beams (14) between the adjacent main beams (13), and assemble the steel plate composite beam; Step two, steel plate composite beam hoisting construction: adopt the single longitudinal beam whole span hoisting method, and use the automobile crane to hoist, and the steel plate composite beam longitudinal beam hoisting sequence is: inner side beam, middle beam, middle beam, outer side beam; Step three, steel bar binding: install the assembly type steel bar jig (15), position the steel bar spacing by using the transverse comb plate (17) and the longitudinal comb plate (23), and bind the steel bars of the prefabricated bridge deck (36); Step four, steel bar framework into the mold and bridge deck pouring: after installing the detachable bridge deck formwork system, align and lower the transverse steel bars and the transverse comb plate (17), so that the steel bar framework enters the mold; and pour the prefabricated bridge deck (36). Step five, epoxy mortar paving: install epoxy mortar paving device, adjust the position of displacement adjustment shaft (52) by using sliding block (54), realize the accurate paving of epoxy mortar (57); and use epoxy mortar screed knife to assist paving; adjust the delivery of epoxy mortar (57) by valve (65); Step six, accurate positioning of bridge deck: use the precast bridge deck accurate positioning auxiliary device, through the hoisting of bridge deck (36) to make the guide channel steel (35) fall into the limiting groove (32); Step seven, wet joint construction: install wet joint steel setting positioning device, after wet joint steel positioning, wet joint formwork is fixed by steel cable (39) and pressing plate (38), then pour concrete.

8. The method of constructing a steel plate girder according to claim 7, wherein In step seven: bamboo plywood is used as the bottom mold of wet joint, plastic sleeve (43) is arranged on steel cable (39), and second fixed connecting plate (46) is arranged at both ends of pressing plate (38); precast bridge deck (36) is provided with embedded positioning plate (50), embedded positioning plate (50) is provided with embedded inserting rod (51), embedded positioning plate (50) is connected with second fixed connecting plate (46) through fixed bolt (9); after the acceptance of steel and formwork, pour concrete; use truck crane to cooperate hopper to pour concrete, use plug-in vibrator, first vibrate around, then in the middle, fast insertion and slow extraction, after the completion of concrete construction, cover plastic film.

Images