A construction method for assembled steel-concrete composite bridge

Abstract

The present invention provides a construction method for an assembled steel-concrete composite bridge, including: S1, making two specifications of prefabricated bridge panels, each prefabricated bridge panel is respectively arranged with a T-shaped embedded steel plate and a straight-shaped embedded steel plate at the bottom, and heat preservation and moisture maintenance are performed to the designed strength; S2, making a steel box beam, arranging two groups of tire frames in parallel at intervals, and sequentially installing a steel box bottom plate, a steel box web plate and a steel box diaphragm on the two groups of tire frames, completing the production of the first steel box and the second steel box, positioning and installing a steel cross beam between the first steel box and the second steel box, adjusting and checking the linear size, and symmetrically welding the entire section to form a unified whole; S3, hoisting the prefabricated bridge panel to the top of the steel box beam, so that the T-shaped embedded steel plate is butted with the steel box diaphragm and the steel box web plate, and the straight-shaped embedded steel plates between adjacent prefabricated bridge panels are butted. Through the disclosure of the present invention, the weight of the bridge is reduced, and at the same time, the effective connection between the prefabricated bridge panel and the steel box beam is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of building bridges, and more specifically to a construction method for an assembled steel-concrete composite bridge. Background Art

[0002] With the accelerated pace of social development, large-span bridges are being used more and more widely, especially steel-concrete composite bridges, which are gradually becoming the mainstream of modern bridge construction, and precast panels of steel-concrete composite bridges are being used more and more frequently.

[0003] When constructing most steel-concrete composite bridges, the lower steel box girder structure is completed first, and then the precast concrete slab is constructed on top of the steel girder. There are few effective connections between the steel box girder and the precast concrete slab, and the quality of the precast slab cannot be guaranteed on-site. At the same time, the traditional steel box girder structure is integral, and the amount of steel used is large, resulting in excessive weight of the bridge section, high construction cost, and inconvenient transportation.

[0004] Traditional large-span steel-concrete composite bridges have large deflection deformation and complex structural stress. Structural force adjustment often needs to be made through the inclined cables of the bridge's external towers and the tie cables of the arch structure, which greatly increases the structural form and engineering workload.

[0005] In order to realize the assembled construction of bridges as much as possible, reduce the assembly work of on-site beam sections and the pouring and curing time of wet joints of bridge deck concrete slabs, and improve the prefabrication construction of the project, therefore, an application is made for an assembled steel-concrete composite bridge structure, in which the construction of bridge deck concrete prefabricated slabs is carried out while processing the box beams, the steel box beams and concrete prefabricated slabs are superimposed and assembled in the factory, and then the wet joints between the prefabricated slabs of each beam section are poured, and at the same time, the prestressing and tensioning of the prefabricated bridge deck and the steel box beam are adjusted, which greatly improves the prefabrication and construction quality of the beam sections and improves the installation efficiency of the on-site beam sections. Summary of the invention

[0006] The purpose of the invention is to disclose a construction method of an assembled steel-concrete composite bridge.

[0007] To achieve the above object, the present invention provides a construction method for an assembled steel-concrete composite bridge, comprising:

[0008] S1, make two specifications of prefabricated bridge panels, each prefabricated bridge panel is arranged with a T-shaped embedded steel plate and a straight-shaped embedded steel plate at the bottom, and the panels are kept warm and moisturized to the designed strength;

[0009] S2, manufacturing a steel box beam, arranging two sets of tire frames in parallel at intervals, installing a steel box bottom plate, a steel box web plate and a steel box cross partition plate on the two sets of tire frames in sequence, completing the manufacturing of the first steel box and the second steel box, positioning and installing a steel cross beam between the first steel box and the second steel box, adjusting and checking the linear dimensions, and symmetrically welding the entire section to form a unified whole;

[0010] S3, hoist the prefabricated bridge deck to the top of the steel box girder, position the prefabricated bridge deck by the guide frame and the baseline, and accurately position the steel box diaphragm and the web of the T-shaped embedded steel plate by temporary accessories, so that the T-shaped embedded steel plate is butted with the steel box diaphragm and the steel box web, and the straight embedded steel plates between adjacent prefabricated bridge decks are butted;

[0011] S4, after precise adjustment, weld the butt weld between the web of the T-shaped embedded steel plate and the steel box cross diaphragm, weld the foot weld between the top plate of the T-shaped embedded steel plate and the top plate of the steel box web, weld the weld of the I-shaped embedded steel plate between adjacent prefabricated bridge panels, so that the steel beam and prefabricated panel are welded together into a whole, completing the superposition of a single segment.

[0012] As a further improvement of the present invention, the present invention further includes step S5, after the prefabricated bridge deck and the steel box girder are superimposed and welded, the steel bars in the wet joints between the prefabricated bridge decks are tied, and at the same time, a prestressed sleeve is arranged, and a first prestressed cable is introduced into the sleeve, and concrete is poured for the transverse wet joints and the longitudinal wet joints;

[0013] Arranging second prestressed cables along the width direction of the bridge, penetrating the webs of the T-shaped embedded steel plates and axially connecting adjacent T-shaped embedded steel plates;

[0014] The first prestressed cables and the second prestressed cables are used to adjust the stress and deformation of a single segment of the bridge during post-assembly.

[0015] As a further improvement of the present invention, a plurality of segments are arranged along the length direction of the bridge, each segment comprising:

[0016] Steel box girder, which serves as the main support of the bridge;

[0017] A prefabricated bridge deck is arranged on top of the steel box girder;

[0018] The steel box girder is a separated steel box structure, comprising:

[0019] A first steel box and a second steel box having the same structure and arranged symmetrically on both sides;

[0020] A steel crossbeam for connecting the first steel box and the second steel box;

[0021] The prefabricated bridge deck comprises:

[0022] a plurality of first bridge panels arranged at intervals on the first steel box;

[0023] a plurality of second bridge decks arranged at intervals on the second steel box;

[0024] a plurality of third bridge decks arranged at intervals on the steel cross beam;

[0025] The first bridge deck has the same specifications as the second bridge deck, and the first bridge deck has the same number as the second bridge deck and the third bridge deck, and is arranged in an interval array;

[0026] The bottoms of the first bridge deck, the second bridge deck and the third bridge deck are all provided with T-shaped embedded steel plates for connecting with the steel box girder;

[0027] The web of the T-shaped embedded steel plate is connected to the web of the steel box, the steel beam or the steel box diaphragm;

[0028] Both ends of the top plate of the T-shaped embedded steel plate are respectively connected to the top plate portion of the steel box web plate;

[0029] I-shaped embedded steel plates for positioning and splicing are fixedly provided between the plurality of the first bridge decks, between the plurality of the second bridge decks, and between the plurality of the third bridge decks.

[0030] As a further improvement of the present invention, the number of the first bridge deck, the second bridge deck and the third bridge deck are the same, the first bridge deck and the second bridge deck have the same structure, and are symmetrically distributed on both sides of the third bridge deck, and are spaced apart from the third bridge deck;

[0031] A first transverse wet joint is formed between adjacent first bridge decks;

[0032] A second transverse wet joint is formed between adjacent second bridge decks;

[0033] A third transverse wet joint is formed between adjacent third bridge decks;

[0034] The first transverse wet seam, the second transverse wet seam and the third transverse wet seam are arranged along the same axial direction;

[0035] A total of four parallel longitudinal wet joints are formed between the first bridge deck, the third bridge deck, the second bridge deck and the steel box webs on both sides of the steel box girder.

[0036] As a further improvement of the present invention, the temporary accessory comprises:

[0037] Multiple groups of angle steels, each group of angle steels includes two angle steels symmetrically arranged up and down, used to connect the web of the T-shaped embedded steel plate and the steel box beam diaphragm or the steel beam, and neoprene pads are provided between the angle steels.

[0038] As a further improvement of the present invention, the guide frame is fixedly mounted on the top end of the steel box beam diaphragm, and a wedge-shaped structure is formed on the top to be connected to the bottom end of the web of the T-shaped embedded steel plate.

[0039] As a further improvement of the present invention, cantilever structures are arranged at both ends of the steel box girder.

[0040] As a further improvement of the present invention, notches are formed at both ends of the first bridge deck, the second bridge deck and the third bridge deck, and the notches allow both ends of the top plate of the T-shaped embedded steel plate to leak out.

[0041] As a further improvement of the present invention, the two ends of the bridge deck are concave-convex structures.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) A construction method for an assembled steel-concrete composite bridge, wherein multiple steel box girders are preassembled in a factory and prefabricated bridge decks are superimposed in the factory to achieve assembly accuracy requirements of the prefabricated bridge decks and steel box girders, thereby facilitating linear adjustment.

[0044] (2) A first prestressed cable-steel strand is arranged inside the wet joint of the concrete bridge deck of a single segment to control the deformation of the bridge top plate; a second prestressed cable-steel strand is coaxially arranged along the width direction of the bridge through the web of the T-shaped embedded steel plate on the top of the steel box diaphragm to control the deformation of the steel box girder, which is ultimately beneficial to the overall deformation and stress adjustment of the bridge.

[0045] (3) Prefabrication and wet joint casting and curing in the factory can reduce the shrinkage and creep effects of concrete, while ensuring the prefabricated bridge deck's lap line shape and the longitudinal and transverse slope requirements of wet joint casting. Compared with the on-site lap construction process, it can reduce the construction period and workload of on-site lap, weld welding, and wet joint casting, saving construction time; it solves the safety and technical problems of the conventional on-site assembly of steel box girders + cast-in-place bridge deck methods, such as high cost, slow construction schedule, large installation accuracy error, uncontrollable construction quality, and many construction safety hazards.

[0046] (4) The steel box girder is a separated steel box structure. The combination of the first steel box, the second steel box and the steel cross beam greatly reduces the steel consumption of the top plate, the bottom plate and the middle cross beam, and optimizes the problem of the overall excessive weight of the traditional steel box girder. The combination of the first bridge deck, the second bridge deck and the third bridge deck is adopted. The web of the T-shaped embedded steel plate is connected to the web, the steel cross beam or the steel box cross partition on both sides of the steel box; the two ends of the top plate of the T-shaped embedded steel plate are respectively connected to the top plate of the steel box web on both sides of the steel box, so that the steel box girder as a whole forms an effective connection, realizes effective force transmission of the structure, and solves the problem of insufficient effective connection and poor force transmission effect of the existing technical solution; the notches at both ends of the prefabricated bridge deck are set to ensure a tighter connection between the prefabricated bridge deck and the wet joint. The two ends of the prefabricated bridge deck are concave and convex structures, which have better connection effect than the flat surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a three-dimensional schematic diagram of a segment of a bridge structure in a construction method of an assembled steel-concrete composite bridge of the present invention;

[0048] Figure 2 for Figure 1 Schematic diagram of the assembly of the steel box girder and the precast bridge deck;

[0049] Figure 3 It is a structural schematic diagram of a steel box girder in a construction method of an assembled steel-concrete composite bridge of the present invention, and also illustrates a cantilever structure and two groups of T-shaped embedded steel plates;

[0050] Figure 4 It is a schematic diagram of the connection structure of a single prefabricated bridge deck and a T-shaped embedded steel plate and a straight-shaped embedded steel plate in a construction method of an assembled steel-concrete composite bridge of the present invention;

[0051] Figure 5 It is a three-dimensional schematic diagram of a first bridge deck in a construction method of an assembled steel-concrete composite bridge of the present invention;

[0052] Figure 6 for Figure 5 The left view schematic diagram shows the positional relationship between the first bridge deck and the I-shaped embedded steel plate and the T-shaped embedded steel plate;

[0053] Figure 7 A schematic diagram of the final shape of a single stage of the bridge, and the position of the first prestressed cable is shown in the figure;

[0054] Figure 8 It is a schematic diagram of the main view of the bridge forming effect in the construction method of an assembled steel-concrete composite bridge of the present invention;

[0055] Fig. 9 for Figure 8 The partial schematic diagram of the invention also shows the position of the second prestressed cable. In the figure: 10, first steel box; 20, second steel box; 30, steel beam; 40, T-shaped embedded steel plate; 41, first bridge deck; 42, second bridge deck; 43, third bridge deck; 44, I-shaped embedded steel plate; 50, cantilever structure; 61, longitudinal wet joint; 62, transverse wet joint; 71, first prestressed cable; 72, second prestressed cable; 121, steel box web; 122, steel box transverse diaphragm; 123, steel box bottom plate; 410, notch; 1210, top plate. DETAILED DESCRIPTION

[0056] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0057] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0058] Please refer to Figures 1 to 9 A specific implementation method of a construction method of an assembled steel-concrete composite bridge of the present invention is shown.

[0059] A construction method for an assembled steel-concrete composite bridge comprises: S1, manufacturing two specifications of prefabricated bridge panels, wherein a T-shaped embedded steel plate 40 and a straight-shaped embedded steel plate 44 are arranged at the bottom of each prefabricated bridge panel, and heat-insulating and moisture-maintaining maintenance is performed to a designed strength;

[0060] The precast bridge deck is manufactured in blocks on the precast tire frame and formwork system in the workshop to achieve mass production. Its main materials are HRB400 grade steel bars, straight threaded sleeves, ML15AL shear nails, Q345qD embedded steel plates, and coarse aggregate active powder concrete. The thickness of the standard section of the precast bridge deck is 0.17m, and the thickness of the axil corner is 0.40m. The production process is: 1) Install the steel tire frame and steel bottom formwork according to the bottom line type of the board; 2) Locate the shear nails on the T-shaped embedded steel plate 40 and weld them, hoist the welded T-shaped embedded steel plate 40 to embed it into the groove of the bottom formwork, limit and reinforce it to ensure that the upper surface of the T-shaped embedded steel plate 40 is flush with the upper surface of the bottom membrane, and refer to Figure 6 As shown; 3) Make and install the steel bars for connecting the precast panels. The steel bars are connected through straight threaded sleeves. The ends of the steel bars around the precast panels are pre-embedded with straight threaded sleeves. Protective covers are installed. The ends are close to the side formwork. At the same time, lifting sleeves and anchor bolts of the auxiliary structures are pre-embedded; 4) Check and clean up debris, pour coarse aggregate active powder concrete symmetrically in layers, vibrate and level the surface, maintain moisture retention for no less than 30 days, and store the panels for more than 6 months. The steel frame and steel bottom formwork must have sufficient strength, rigidity, and stability, and the linear shape can be flexibly adjusted. The accuracy of the side form plane dimensions and the precision of the steel bar positioning are very important. The former is the basic guarantee for the appearance quality of the precast panels. At the same time, both will directly affect the accuracy of the simultaneous superposition of multiple bridge panels with the steel structure and the quality of the main beam structure.

[0061] S2, make steel box beam, reference Figure 3As shown, two groups of tire frames are arranged in parallel at intervals, and the steel box bottom plate 123, the steel box web plate 121 and the steel box cross partition 122 are respectively installed on the two groups of tire frames in sequence to complete the production of the first steel box 10 and the second steel box 20. The steel cross beam 30 is positioned and installed between the first steel box 10 and the second steel box 20, and the linear size is adjusted and checked. The whole section is symmetrically welded to form a unified whole;

[0062] The steel box girder adopts a separated steel box structure. The left and right steel boxes are connected by a concrete bridge deck and a steel cross beam 30. The main materials are Q345qD and Q420qD steel plates with a thickness of 14 to 50 mm. The steel box girder is manufactured in sections on a continuous tire frame in the workshop. 1) The tire frame foundation is 400 mm thick reinforced concrete + pre-embedded longitudinal and transverse strip steel plates. The tire frame steel is positioned and welded on the pre-embedded steel plate of the foundation according to the linear shape of the steel box bottom plate 123. 2) The steel plate is pre-treated and painted with workshop primer, and the plasma cutting machine accurately cuts and cuts the material, opens the groove and grinds; 3) The steel box bottom plate 123, steel box diaphragm 122, and steel box web 121 are installed and positioned on the tire frame in sequence, and the left and right box room cross beam units are positioned and installed, and the linear shape size is adjusted and checked. The whole section is symmetrically welded to form a unified whole. The steel box diaphragm 122, steel cross beam 30, and the web of the T-shaped pre-embedded steel plate 40 at the bottom of the prefabricated bridge deck correspond to each other. The top plate 1210 of the steel box web 121 is used as the main load-bearing member, and is later butt-welded with the top plate of the T-shaped embedded steel plate 40 at the bottom of the prefabricated bridge deck. The steel frame must have sufficient strength, rigidity, and stability, and the precise positioning of various plate units directly affects the quality of the superposition welding of the prefabricated bridge deck in the later stage.

[0063] S3, hoist the prefabricated bridge deck to the top of the steel box girder, position the prefabricated bridge deck by the guide frame and the baseline, and accurately position the steel box diaphragm 122 and the web of the T-shaped embedded steel plate 40 by temporary accessories, so that the T-shaped embedded steel plate 40 is butted with the steel box diaphragm 122 and the steel box web 121, and the I-shaped embedded steel plates 44 between adjacent prefabricated bridge decks are butted; S4, after precise adjustment, weld the butt weld between the web of the T-shaped embedded steel plate 40 and the steel box diaphragm 122, weld the foot weld between the top plate of the T-shaped embedded steel plate 40 and the top plate part 1210 of the steel box web 121, and weld the weld of the I-shaped embedded steel plate 44 between adjacent prefabricated bridge decks, so that the steel beam and the prefabricated plate are overlapped and welded into a whole, completing the overlap work of a single segment.

[0064] Ginseng Figure 7 and Fig. 9, further comprising step S5, after the prefabricated bridge deck and the steel box girder are overlapped and welded, the steel bars in the wet joints between the prefabricated bridge decks are tied, and prestressed sleeves are arranged at the same time, and the first prestressed cables 71 are introduced into the sleeves, and concrete is poured for the transverse wet joints 62 and the longitudinal wet joints 61; second prestressed cables 72 are arranged along the width direction of the bridge, which penetrate the web of the T-shaped embedded steel plates 40 and axially connect the adjacent T-shaped embedded steel plates 40; and the first prestressed cables 71 and the second prestressed cables 72 are used to adjust the stress and deformation of a single segment of the bridge for later assembly.

[0065] Ginseng Figure 1 and Figure 2 As shown, the bridge comprises a plurality of sections arranged along the length direction of the bridge, each section comprising: a steel box girder as the supporting body of the bridge; a prefabricated bridge deck, arranged in a stacked manner above the steel box girder; the steel box girder is a separated steel box structure, comprising: a first steel box 10 and a second steel box 20 of the same structure and arranged symmetrically on both sides; a steel cross beam 30 used for connecting the first steel box 10 and the second steel box 20; the prefabricated bridge deck comprises: a plurality of first bridge decks 41 arranged at intervals on the first steel box 10; a plurality of second bridge decks 42 arranged at intervals on the second steel box 20; a plurality of third bridge decks 43 arranged at intervals on the steel cross beam 30; the first bridge deck 41 and the second bridge deck 42 have the same specifications, the first bridge deck 41 is the same in number as the second bridge deck 42 and the third bridge deck 43, and is arranged in an array at intervals;

[0066] Ginseng Figure 5 and Figure 6 As shown, the bottoms of the first bridge deck 41, the second bridge deck 42 and the third bridge deck 43 are all provided with T-shaped embedded steel plates 40 for connecting with the steel box girder; the webs of the T-shaped embedded steel plates 40 are connected with the steel box webs 121, the steel cross beams 30 or the steel box cross partitions 122; the two ends of the top plates of the T-shaped embedded steel plates 40 are respectively connected with the top plate portions 1210 of the steel box webs 121; and straight-line embedded steel plates 44 for positioning and splicing are fixedly provided between the plurality of the first bridge decks 41, the plurality of the second bridge decks 42 and the plurality of the third bridge decks 43.

[0067] The prefabricated bridge deck comprises two first bridge decks 41, two second bridge decks 42 and two third bridge decks 43; the first bridge decks 41 and the second bridge decks 42 are symmetrically distributed on both sides of the third bridge deck 43 and arranged in the same direction. The temporary accessories include: a plurality of groups of angle steels, each group of the angle steels comprises two symmetrically arranged up and down, used to connect the web of the T-shaped embedded steel plate 40 and the steel box girder diaphragm or the steel cross beam 30, and neoprene pads are arranged between the angle steels. The guide frame is fixed to the top of the steel box girder diaphragm, and a wedge-shaped structure is formed on the top to connect with the bottom end of the web of the T-shaped embedded steel plate 40. A total of four longitudinal wet joints 61 and three transverse wet joints 62 are formed between the prefabricated bridge decks of each segment. Cantilever structures 50 are arranged at both ends of the steel box girder. Figure 4 As shown, notches 410 are formed at both ends of the first bridge panel 41 , the second bridge panel 42 and the third bridge panel 43 , and the notches 410 allow both ends of the top plate of the T-shaped embedded steel plate 40 to leak out.

[0068] Ginseng Figure 8 The construction method between steel-concrete composite beam sections is as follows: after the beam sections are transported and hoisted into place after curing, the steel box bottom plate 123, steel box web plate 121, and I-shaped embedded steel plate 44 of adjacent beam sections are welded symmetrically in sequence. After the welding work is completed, the joint surface of the prefabricated bridge deck is chiseled and cleaned, the wet joint steel bars between the beam sections are tied, and the heat preservation and moisture retention are maintained to the design strength, and the whole bridge is formed.

[0069] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A construction method for a prefabricated steel-concrete composite bridge, wherein the prefabricated steel-concrete composite bridge comprises a plurality of segments arranged along the length direction of the bridge, each segment include: Steel box girder, which serves as the supporting body of the bridge; A prefabricated bridge deck is arranged on top of the steel box girder; The steel box girder is a separated steel box structure, including: a first steel box and a second steel box of the same structure and arranged symmetrically on both sides; a steel cross beam used to connect the first steel box and the second steel box; the prefabricated bridge deck includes: a plurality of first bridge decks arranged at intervals on the first steel box; a plurality of second bridge decks arranged at intervals on the second steel box; a plurality of third bridge decks arranged at intervals on the steel cross beam; the first bridge deck has the same specifications as the second bridge deck, and the number of the first bridge deck, the second bridge deck and the third bridge deck is the same, and they are arranged in an array at intervals. ; The bottoms of the first bridge deck, the second bridge deck and the third bridge deck are all provided with T-shaped embedded steel plates for connecting with the steel box beam; the webs of the T-shaped embedded steel plates are connected with the steel box webs, steel beams or steel box diaphragms; the top plates of the T-shaped embedded steel plates are respectively connected with the top plates of the steel box webs; a straight-line embedded steel plate for positioning and splicing is fixed between the plurality of the first bridge decks, the plurality of the second bridge decks and the plurality of the third bridge decks; it is characterized by comprising: S1, making two specifications of prefabricated bridge decks, each The bottom of the prefabricated bridge deck is respectively arranged with a T-shaped embedded steel plate and a straight-shaped embedded steel plate, which are insulated and maintained to the designed strength; S2, the steel box girder is manufactured, two sets of tire frames are arranged in parallel at intervals, and the steel box bottom plate, steel box web plate and steel box cross partition are installed on the two sets of tire frames in sequence to complete the manufacture of the first steel box and the second steel box, and the steel cross beam is positioned and installed between the first steel box and the second steel box, and the linear size is adjusted and checked, and the whole section is symmetrically welded to form a unified whole; S3, the prefabricated bridge deck is hoisted to the top of the steel box girder, and the prefabricated bridge deck is positioned by the guide frame and the baseline And use temporary accessories to accurately locate the steel box diaphragm and the web of the T-shaped embedded steel plate, so that the T-shaped embedded steel plate is butted against the steel box diaphragm and the steel box web, and the I-shaped embedded steel plates between adjacent prefabricated bridge panels are butted against each other; S4, after precise adjustment, weld the butt weld between the web of the T-shaped embedded steel plate and the steel box diaphragm, weld the foot weld between the top plate of the T-shaped embedded steel plate and the top plate of the steel box web, weld the weld of the I-shaped embedded steel plate between adjacent prefabricated bridge panels, so that the steel beam and the prefabricated panel are overlapped and welded into a whole, completing the overlap work of a single segment.

2. A construction method for an assembled steel-concrete composite bridge according to claim 1, It is characterized in that The method also includes step S5, wherein after the prefabricated bridge deck and the steel box girder are overlapped and welded, the steel bars in the wet joints between the prefabricated bridge decks are tied, and prestressed sleeves are arranged at the same time, and first prestressed cables are introduced into the sleeves to cast concrete in the transverse wet joints and the longitudinal wet joints; second prestressed cables are arranged along the width direction of the bridge, which penetrate the web of the T-shaped embedded steel plates and axially connect the adjacent T-shaped embedded steel plates; and the first prestressed cables and the second prestressed cables are used to adjust the stress and deformation of a single segment of the bridge for later assembly.

3. The construction method of a prefabricated steel-concrete composite bridge according to claim 1, It is characterized in that The number of the first bridge deck panels, the second bridge deck panels and the third bridge deck panels are all the same; the first bridge deck panels have the same structure as the second bridge deck panels and are symmetrically distributed on both sides of the third bridge deck panels, and are spaced apart from the third bridge deck panels; a first transverse wet joint is formed between adjacent first bridge deck panels; a second transverse wet joint is formed between adjacent second bridge deck panels; a third transverse wet joint is formed between adjacent third bridge deck panels; the first transverse wet joint, the second transverse wet joint and the third transverse wet joint are arranged along the same axial direction; a total of four parallel longitudinal wet joints are formed between the first bridge deck panel, the third bridge deck panel, the second bridge deck panel and the steel box webs on both sides of the steel box girder.

4. The construction method of a prefabricated steel-concrete composite bridge according to claim 1, It is characterized in that The temporary accessories include: multiple groups of angle steels, each group of the angle steels includes two symmetrically arranged up and down, used to connect the web of the T-shaped embedded steel plate and the steel box beam diaphragm or the steel beam, and neoprene pads are provided between the angle steels.

5. The construction method of a prefabricated steel-concrete composite bridge according to claim 1, It is characterized in that The guide frame is fixedly arranged on the top end of the steel box beam diaphragm, and a wedge-shaped structure is formed on the top end thereof to be connected with the bottom end of the web of the T-shaped embedded steel plate.

6. The construction method of a prefabricated steel-concrete composite bridge according to claim 1, It is characterized in that Both ends of the steel box girder are arranged with cantilever structures.

7. The construction method of a prefabricated steel-concrete composite bridge according to claim 1, It is characterized in that Notches are formed at both ends of the first bridge deck, the second bridge deck and the third bridge deck, and the notches allow both ends of the top plate of the T-shaped embedded steel plate to leak out.

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