Novel steel guide beam structure

Abstract

The invention discloses a novel steel guide beam structure, and relates to the technical field of buildings. The connecting structure comprises a box girder, a first section is fixedly installed on one side of the box girder, a second section is connected to the side, away from the box girder, of the first section, a third section is connected to the side, away from the first section, of the second section, and the first section, the second section and the third section are connected through connecting sections. Guide beams are arranged among the upper end faces of the first section, the second section and the third section, guide beam webs are installed in inner cavities among the first section, the second section and the third section, local buckling and stress concentration under concentrated loads are effectively resisted, efficient utilization of materials is achieved, and total cross-section force transmission is ensured. The transverse stiffening ribs and the vertical stiffening ribs are subjected to double-face corner cut welding, stress concentration is reduced, the fatigue life is prolonged, the outer side flange plates are gradually changed from 40 cm to 0 cm, a wedge-shaped connector in smooth transition is formed, load distribution is optimized, end stress sudden change is reduced, the matching performance with a main beam is enhanced, and transverse connecting steel pipes are connected through flange plates.

Description

Technical Field

[0001] This invention relates to the field of building technology, and in particular to a novel steel guide beam structure. Background Technology

[0002] Steel structures, with their excellent mechanical properties, lightweight structure, and high plasticity, have achieved high-quality development in long-span bridges and municipal landscape bridges. The incremental launching construction technique for steel structure bridges has emerged in response to this development and is being adopted and promoted in numerous steel structure bridge construction projects. A prefabricated steel guide beam structure for incremental launching construction of steel structure bridges, possessing good mechanical properties, meeting design requirements, being reusable, highly safe and reliable, convenient for construction, and effectively reducing project costs, is the cornerstone of high-quality development in the bridge industry.

[0003] A search revealed a novel steel box girder guide beam structure in Chinese invention patent publication number CN118686050A. The structure includes a steel box girder and a guide beam body connected to it. The guide beam body comprises several guide beam frames with variable cross-sections, formed by variable-height I-beams. Each guide beam frame includes left / right trusses and upper / lower flanges fixedly connected to them. Guide beam webs or steel trusses are fixedly mounted on the left / right trusses. The guide beam frame consists of several segments, including inclined and horizontal segments. The height of the guide beam frame decreases from one side of the steel box girder to the side furthest from it. A connecting nose beam is fixedly or detachably provided at the front end of the guide beam body. The connecting nose beam is stepped, with at least three steps, and the total height of each step is not greater than the height of the side of the guide beam body furthest from the steel box girder. Several transverse connecting systems are provided between the left / right trusses.

[0004] In existing guide beam structures, during jacking construction, the cantilever section at the front end of the guide beam is prone to excessive deflection due to its own weight and construction load, leading to structural instability or overturning. The web and flanges are prone to local buckling under high pressure stress or shear force, resulting in structural failure. The connection between the guide beam and the main beam and the transverse connecting steel pipe must take into account strength, stiffness and construction efficiency, and the guide beam must maintain sufficient stiffness during the jacking process to avoid excessive deflection affecting construction safety.

[0005] Therefore, the existing new steel guide beam structure cannot meet the needs of actual use, so there is an urgent need for improved technology in the market to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a novel steel guide beam structure that solves the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0008] This invention relates to a novel steel guide beam structure, comprising a box girder 1, characterized in that: a first segment 2 is fixedly installed on one side of the box girder 1; a second segment 3 is connected to the side of the first segment 2 away from the box girder 1; a third segment 4 is connected to the side of the second segment 3 away from the first segment 2; the first segment 2, the second segment 3, and the third segment 4 are connected by a connecting segment 5; a guide beam 6 is provided between the upper surfaces of the first segment 2, the second segment 3, and the third segment 4; and a guide beam web 8 is installed in the inner cavity between the first segment 2, the second segment 3, and the third segment 4.

[0009] The guide beam 6 is designed to be 25 meters long. The steel used for the guide beam 6 is the same as that used for the main beam. The steel beam consists of three sections, with the first and third sections being 8 meters long and the second section being 9 meters long. The connecting rod steel plate is 20mm thick. The guide beam 6 is connected with 10.9 grade M30 high-strength bolts, and the bolt hole diameter is 33mm.

[0010] Furthermore, the box girder 1 includes box bodies 11 symmetrically arranged on the side away from the first segment 2, and wing plates 12 are fixedly connected to the ends of the two box bodies 11 that are far apart from each other, and a box girder web plate 13 is fixedly connected between the two box bodies 11.

[0011] Furthermore, the first segment 2 includes a stiffening plate 21 fixedly connected to one side of the box body 11 on the ground. The upper end of the stiffening plate 21 is fixedly connected to a top and bottom plate 22 by a support column. The two top and bottom plates 22 are symmetrically connected to upper and lower horizontal connecting rods 23, and the two upper and lower horizontal connecting rods 23 are symmetrically connected to a straight web rod 24.

[0012] Furthermore, a diagonal web member 25 is connected between the two straight web members 24 via a flange 7, a connecting section 5 is fixedly connected to the side of the stiffening plate 21 away from the box girder 1, and a guide beam 6 is fixedly connected to the upper end face of the stiffening plate 21.

[0013] Furthermore, the second segment 3 includes a stiffening plate 31 fixedly connected to the side of the connecting segment 5 away from the first segment 2. The upper end face of the stiffening plate 31 is fixedly connected to a top and bottom plate 32 via a support column. Upper and lower horizontal connecting rods 33 are fixedly connected between the two support columns. Straight web rods 34 are symmetrically connected between the two upper and lower horizontal connecting rods 33. Diagonal web rods 35 are rotatably connected between the two straight web rods 34. Another connecting segment 5 is fixedly connected between the stiffening plate 31 and the top and bottom plate 32 on the side away from the first segment 2.

[0014] Furthermore, the third segment 4 includes a stiffening plate 3 41 symmetrically fixedly connected to the side of the connecting segment 5 away from the second segment 3. The upper end face of the stiffening plate 3 41 is fixedly connected to a top and bottom plate 3 42 by a support column. The two top and bottom plates 3 42 are symmetrically fixedly connected to upper and lower horizontal connecting rods 3 43. The two upper and lower horizontal connecting rods 3 43 are rotatably connected to a straight web member 3 44. The two straight web members 3 44 are connected to a diagonal web member 3 45 by a flange 7.

[0015] Furthermore, the guide beam web 8 should have the same cross slope of 2% as the box girder web 13, and a neck rib should be fixedly connected at the position of the partition plate of the box girder web 13.

[0016] Furthermore, the flange 7 specifically includes flange A71, flange B72, and flange C73. Flange A is suitable for horizontal connection of P325 pipes, flange B72 is suitable for horizontal connection of horizontal vertical bars, and flange C73 is suitable for diagonal connection. When flange B72 is welded to a P325 pipe, the minimum flange pipe length is guaranteed to be 20cm. When flange C73 is welded to a P325 pipe, the minimum side pipe length is guaranteed to be 25cm. The weld intersection line should be developed according to the diagonal angle.

[0017] Furthermore, the flange 7 bolt connection plate is 16mm thick, the bolt hole diameter is 22mm, the connecting bolts are 12 sets with a length of 80mm, the stiffening plate D is distributed on both sides of the bolt connection plate and welded to the steel pipe, and it is evenly distributed in the middle of the bolt with an included angle of 30°; the stiffening plate F is used to stiffen the P325 pipe and the guide beam web plate, the included angle of the stiffening plate is 90°, and the M20 high-strength bolt connection pairs are evenly and symmetrically arranged with an included angle of 30°.

[0018] Furthermore, flange A71 is suitable for horizontal P325 pipe connections, flange B is suitable for horizontal horizontal vertical bar connections, and flange C73 is suitable for diagonal bar connections. When welding flange B72 to a P325 pipe, the minimum flange pipe length must be 20cm; when welding flange C73 to a P325 pipe, the minimum side pipe length must be 25cm. The weld intersection line should be laid out according to the diagonal angle.

[0019] The present invention has the following beneficial effects:

[0020] 1. This invention employs a thicker (20mm) first transverse stiffener at the bottom of the web, combined with dense vertical stiffeners (30cm spacing) within a 60cm height range, effectively resisting local buckling and stress concentration under concentrated loads, achieving efficient material utilization. The web and top / bottom plates utilize full-penetration welding to ensure force transmission across the entire cross-section. Double-sided fillet welding is used for the transverse and vertical stiffeners to reduce stress concentration and improve fatigue life. The outer flange plate gradually transitions from 40cm to 0cm, forming a smooth wedge-shaped interface, optimizing load distribution, reducing end stress abrupt changes, and enhancing compatibility with the main beam. Transverse connecting steel pipes are connected via flanges, using 10.9 grade M30 high-strength bolts (33mm hole diameter) for rapid positioning and fastening. The embedded design of the flanges and stiffeners (cutting to avoid conflict areas) ensures assembly accuracy and reduces on-site adjustment time.

[0021] 2. This invention uses flanges A / B / C bolts to connect plates with a thickness of 16mm, with 12 sets of 80mm bolts symmetrically arranged at a 30° angle, balancing uniform stress distribution and installation space. The symmetrical arrangement of M20 bolt pairs also follows this principle, reducing construction difficulty. The cross slope of the top web of the guide beam and the web of the box girder is uniformly 2%, avoiding secondary leveling procedures and shortening the construction period. The horizontal (150cm spacing), vertical (30cm at the bottom / gradually decreasing to 50cm at the top) and local densification stiffening form a three-dimensional support network, effectively suppressing the resonance risk caused by high-frequency vibration. It is suitable for dynamic environments such as long-span bridges. Key parts such as stiffening plates D / F have a dual function (serving as both stiffeners and connectors), forming a geometrically invariant system. Even if a single member fails, it can still rely on other paths to transmit force, improving disaster tolerance.

[0022] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a front view structural diagram of the present invention;

[0025] Figure 2 This is a top view of the structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of the first segment of the present invention;

[0027] Figure 4 This is a schematic diagram of the cross-sectional structure of the second segment of the present invention;

[0028] Figure 5 This is a schematic diagram of the cross-sectional structure of the third segment of the present invention;

[0029] Figure 6 This is a schematic diagram of the guide beam web structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the top and bottom plate structure of the guide beam of the present invention;

[0031] Figure 8 This is a schematic diagram of the first segment of the structure of the present invention from the front view;

[0032] Figure 9 This is a schematic diagram of the first segment side view structure of the present invention;

[0033] Figure 10 This is a top view schematic diagram of the first segment structure of the present invention;

[0034] Figure 11 This is a schematic diagram of the front view of the second segment of the present invention;

[0035] Figure 12 This is a schematic diagram of the second segment side view structure of the present invention;

[0036] Figure 13 This is a top view schematic diagram of the second segment structure of the present invention;

[0037] Figure 14 This is a schematic diagram of the front view of the third segment of the present invention;

[0038] Figure 15 This is a schematic diagram of the third segment side view structure of the present invention;

[0039] Figure 16 This is a top view of the third segment of the present invention;

[0040] Figure 17 This is a front view structural diagram of the connecting segment of the present invention;

[0041] Figure 18 This is a top view of the connecting section of the present invention;

[0042] Figure 19 This is a front view of the flange A structure of the present invention;

[0043] Figure 20 For the present invention Figure 10 Enlarged structural diagram of region A in the middle;

[0044] Figure 21 This is a schematic diagram of the connection structure between the bottom of the transverse joint and the web of the guide beam in this invention;

[0045] Figure 22This is a schematic diagram of the connection structure between the top of the transverse joint and the web of the guide beam in this invention;

[0046] Figure 23 This is a front view structural diagram of flange B / C of the present invention;

[0047] Figure 24 For the present invention Figure 10 Enlarged structural diagram of region B in the middle;

[0048] Figure 25 This is a schematic diagram of the enlarged structure of region C in the present invention 10.

[0049] The attached diagram lists the components represented by each number as follows:

[0050] 1. Box girder; 11. Box body; 12. Flange; 13. Box girder web; 2. First section; 21. Stiffening plate one; 22. Top and bottom plates one; 23. Upper and lower horizontal connecting rod one; 24. Straight web member one; 25. Diagonal web member one; 3. Second section; 31. Stiffening plate two; 32. Top and bottom plates two; 33. Upper and lower horizontal connecting rod two; 34. Straight web member two; 35. Diagonal web member two; 4. Third section; 41. Stiffening plate three; 42. Top and bottom plates three; 43. Upper and lower horizontal connecting rod three; 44. Straight web member three; 45. Diagonal web member three; 5. Connecting section; 6. Guide beam; 7. Flange; 71. Flange A; 72. Flange B; 73. Flange C; 8. Guide beam web Detailed Implementation

[0051] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0052] Please see Figure 1-25 As shown, this embodiment is a novel steel guide beam structure, including a box girder. A first segment is fixedly installed on one side of the box girder. A second segment is connected to the side of the first segment away from the box girder. A third segment is connected to the side of the second segment away from the first segment. The first segment, the second segment, and the third segment are connected by connecting segments. A guide beam is provided between the upper surfaces of the first segment, the second segment, and the third segment. A guide beam web is installed in the inner cavity between the first segment, the second segment, and the third segment.

[0053] The guide beam is designed to be 25 meters long. The steel used for the guide beam is the same as that used for the main beam. The steel beam consists of three sections: the first and third sections are 8 meters long, and the second section is 9 meters long. The connecting rod steel plate is 20mm thick. The guide beam is connected with 10.9 grade M30 high-strength bolts. The bolt hole diameter is 33mm. The bottom of the web plate uses a thicker (20mm) first transverse stiffening rib, combined with dense vertical stiffening within a 60cm height range (spaced 30cm), which effectively resists local buckling and stress concentration under concentrated loads, and achieves efficient material utilization.

[0054] Furthermore, the box girder includes box bodies symmetrically arranged on the side furthest from the first segment. Both boxes are fixedly connected to flanges at their furthest ends. A box girder web is fixedly connected between the two boxes. The outer flange plate gradually changes from 40cm to 0cm, forming a smoothly transitioning wedge-shaped interface, optimizing load distribution, reducing end stress abrupt changes, and enhancing the matching with the main girder.

[0055] Furthermore, the first segment includes a stiffening plate fixedly connected to the ground on one side of the box body. The upper end of the stiffening plate is fixedly connected to a top and bottom plate via a support column. The two top and bottom plates are symmetrically connected to upper and lower horizontal connecting rods. The two upper and lower horizontal connecting rods are symmetrically connected to straight web members. The horizontal (150cm spacing), vertical (30cm at the bottom / gradually decreasing to 50cm at the top) and locally dense stiffening form a three-dimensional support network, which effectively suppresses the resonance risk caused by high-frequency vibration and is suitable for dynamic environments such as long-span bridges.

[0056] Furthermore, a diagonal web member is connected between the two straight web members via a flange, a connecting section is fixedly connected to the side of the stiffening plate away from the box girder, and a guide beam is fixedly connected to the upper end face of the stiffening plate.

[0057] Furthermore, the second segment includes a stiffening plate two fixedly connected to the connecting segment on the side away from the first segment. The upper end face of the stiffening plate two is fixedly connected to the top and bottom plates two via support columns. The two support columns are fixedly connected to the upper and lower horizontal connecting rods two. The two upper and lower horizontal connecting rods two are symmetrically connected to the straight web members two. The two straight web members two are rotatably connected to the diagonal web members two. Another connecting segment is fixedly connected between the stiffening plate two and the top and bottom plates two on the side away from the first segment. The dual function of key parts such as the stiffening plate D / F (which is both stiffening and connecting) forms a geometrically invariant system. Even if a single member fails, it can still rely on other paths to transmit force, thereby improving the disaster fault tolerance capability.

[0058] Furthermore, the third segment includes a stiffening plate three symmetrically fixedly connected to the connecting segment on the side away from the second segment. The upper end face of the stiffening plate three is fixedly connected to a top and bottom plate three via a support column. The two top and bottom plates three are symmetrically fixedly connected to upper and lower horizontal connecting rods three. The two upper and lower horizontal connecting rods three are rotatably connected to a straight web member three. The two straight web members three are connected to a diagonal web member three via a flange.

[0059] Furthermore, the cross slope of the guide beam web should be consistent with that of the box girder web at 2%, and stiffening ribs should be fixedly connected at the position of the box girder web diaphragm. The cross slope of the top web of the guide beam and the box girder web should be uniform at 2% to avoid secondary leveling procedures and shorten the construction period. The web and top and bottom plates should be welded with full penetration to ensure force transmission across the entire cross section. The transverse and vertical stiffening ribs should be welded with double-sided fillet welds to reduce stress concentration and improve fatigue life.

[0060] Furthermore, the flanges specifically include flange A, flange B, and flange C. Flange A is suitable for horizontal P325 pipe connections, flange B is suitable for horizontal connections with vertical struts, and flange C is suitable for diagonal connections. When flange B is welded to a P325 pipe, the minimum flange pipe length is 20cm; when flange C is welded to a P325 pipe, the minimum side pipe length is 25cm. The weld intersection line should be laid out according to the diagonal angle. Horizontal connecting steel pipes are connected via flanges, using 10.9 grade M30 high-strength bolts (33mm hole diameter) for rapid positioning and tightening. The embedded design of the flanges and stiffening ribs (cutting to avoid conflict areas) ensures assembly accuracy and reduces on-site adjustment time.

[0061] Furthermore, the flange bolt connection plate is 16mm thick, the bolt hole diameter is 22mm, and there are 12 sets of 80mm long connecting bolts. The stiffening plates D are welded to the steel pipe on both sides of the bolt connection plate, and are evenly distributed in the middle of the bolts with an included angle of 30°. The stiffening plates F are used to stiffen the P325 pipe and the web of the guide beam, with an included angle of 90°. The M20 high-strength bolt connection pairs are evenly and symmetrically arranged with an included angle of 30°.

[0062] Furthermore, flange A is suitable for horizontal P325 pipe connections, flange B is suitable for horizontal connections with horizontal vertical members, and flange C is suitable for diagonal connections. When welding flange B to a P325 pipe, the minimum flange pipe length must be 20cm; when welding flange C to a P325 pipe, the minimum side pipe length must be 25cm. The weld intersection line should be laid out according to the diagonal angle. For flanges A / B / C, the bolt connection plate thickness is 16mm, with 12 sets of 80mm bolts symmetrically arranged at a 30° angle to ensure both uniform stress distribution and sufficient installation space. The symmetrical arrangement of the M20 bolt pairs also follows this principle, reducing construction difficulty.

[0063] Working principle: The top and bottom plates of the guide beam are 20mm thick, and the web is 16mm thick. The first transverse stiffener at the bottom of the web is 20mm thick and 39cm wide, while the remaining transverse stiffeners are 12mm thick and 20cm wide. Vertical stiffeners are 12mm thick and 20cm wide, spaced 150cm apart. Vertical stiffeners of 12cm thick and 39cm wide are used within a 60cm high section at the bottom of the web, spaced 30cm apart. The guide beam is connected transversely using P325*12 steel pipes, and these transverse connections must be horizontal. Vertical and diagonal web connections within the transverse connections use P203*12 steel pipes. Neck ribs should extend into the diaphragm position of the steel box girder web. A stiffening plate, 16mm thick, 20cm high, and 2m long, is added at the center of the connection between the top and bottom plates of the guide beam and the box girder. The outer flange of the guide beam gradually transitions from 40cm to 0cm to form a wedge-shaped interface. Vertical stiffeners are 39cm wide and 12mm thick steel plates. The bottom stiffener spacing is 30cm. The stiffening spacing is 30cm for the first 5 meters and 50cm for the rest. The web plate and top / bottom plate are butt-welded using full penetration welding, while the top / bottom plate and web plate are butt-welded using double-sided fillet welds. All transverse connecting steel pipes are connected by flanges, with fillet welds between the flanges and the guide beam web plate. At points where transverse connecting flange joints intersect with guide beam stiffening, the flange joints should be cut to ensure the integrity of the guide beam stiffening. After the flanges and stiffening plates are inlaid, the flange inlaid positions and the flanges to the guide beam web plate are welded. Flanges A, B, and C have bolted plates with a thickness of 16mm, bolt hole diameter of 22mm, and 12 sets of 80mm long bolts. Stiffening plate D is distributed on both sides of the bolted connecting plate, welded to the steel pipe, evenly distributed at the middle of the bolts with an included angle of 30°. Stiffening plate F is used for stiffening P325 pipes to the guide beam web plate, with an included angle of 90°. M20 high-strength bolt connections are evenly and symmetrically arranged with an included angle of 30°.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A new steel girder structure comprising a box girder (1), characterized in that; The box girder (1) is fixedly installed with a first segment (2) on one side, the first segment (2) is connected with a second segment (3) away from the one side of the box girder (1), the second segment (3) is connected with a third segment (4) away from the one side of the first segment (2), the first segment (2), the second segment (3) and the third segment (4) are connected through a connecting segment (5), guide girders (6) are arranged between the upper end faces of the first segment (2), the second segment (3) and the third segment (4), and guide girder webs (8) are arranged in the cavities between the first segment (2), the second segment (3) and the third segment (4). The guide girders (6) are designed to have a length of 25 m, the steel material used for the guide girders (6) is consistent with that of the main girder, the steel girders are three segments in total, the first segment and the third segment are 8 m long, the second segment is 9 m long, the connecting rod steel plate has a thickness of 20 mm, the guide girders (6) are connected through 10.9-grade M30 high-strength bolts, and the bolt holes all have a diameter of 33 mm.

2. A new type of steel guide beam structure according to claim 1, characterized in that, The box girder (1) comprises box bodies (11) symmetrically arranged away from the one side of the first segment (2), the two box bodies (11) are fixedly connected with wing plates (12) away from the one ends thereof, and the two box bodies (11) are fixedly connected with box girder webs (13).

3. The new type steel girder structure according to claim 1, characterized in that, The first segment (2) comprises a ground stiffening plate one (21) fixedly connected to one side of the box body (11), the upper end face of the ground stiffening plate one (21) is fixedly connected with top and bottom plates one (22) through support columns, the two top and bottom plates one (22) are symmetrically fixedly connected with up-down horizontal link rods one (23), and the two up-down horizontal link rods one (23) are symmetrically fixedly connected with straight web members one (24).

4. The new type steel girder structure according to claim 1, characterized in that, The two straight web members one (24) are connected with inclined web members one (25) through flanges (7), the ground stiffening plate one (21) is fixedly connected with the connecting segment (5) away from the one side of the box girder (1), and the ground stiffening plate one (21) is fixedly connected with the guide girders (6) on the upper end face thereof.

5. The new type steel girder structure according to claim 1, characterized in that, The second segment (3) comprises a ground stiffening plate two (31) fixedly connected to the one side of the connecting segment (5) away from the first segment (2), the upper end face of the ground stiffening plate two (31) is fixedly connected with top and bottom plates two (32) through support columns, the two support columns are fixedly connected with up-down horizontal link rods two (33), the two up-down horizontal link rods two (33) are symmetrically connected with straight web members two (34), the two straight web members two (34) are rotatably connected with inclined web members two (35), and the ground stiffening plate two (31) is fixedly connected with another connecting segment (5) away from the one side of the first segment (2) between the ground stiffening plate two (31) and the top and bottom plates two (32).

6. The new type steel girder structure according to claim 1, characterized in that, The third segment (4) comprises ground stiffening plates three (41) symmetrically fixedly connected to the one side of the connecting segment (5) away from the second segment (3), the upper end face of the ground stiffening plate three (41) is fixedly connected with top and bottom plates three (42) through support columns, the two top and bottom plates three (42) are symmetrically fixedly connected with up-down horizontal link rods three (43), the two up-down horizontal link rods three (43) are rotatably connected with straight web members three (44), and the two straight web members three (44) are connected with inclined web members three (45) through flanges (7).

7. The new type steel girder structure according to claim 1, characterized in that, The web (8) of the guide beam should be consistent with the box girder web (13) transverse slope of two percent, box girder web (13) diaphragm position should be fixedly connected with the neck rib.

8. The new type steel girder structure according to claim 1, characterized in that, The flange (7) specifically includes flange A (71), flange B (72), flange C (73), flange A is suitable for connecting with P325 pipe, flange B (72) is suitable for connecting with horizontal connection middle horizontal vertical rod, flange C (73) is suitable for connecting with inclined rod, flange B (72) is welded with P325 pipe to ensure that the minimum flange pipe length is 20 cm, flange C (73) is welded with P325 pipe to ensure that the minimum side pipe length is 25 cm, and the welding intersection line should be developed according to the angle of inclination.

9. The new type steel girder structure according to claim 1, characterized in that, The flange (7) bolted plate thickness is 16 mm, the bolt hole diameter is 22 mm, the connecting bolt is 12 groups with the length of 80 mm, the stiffener D is distributed on both sides of the bolted plate and welded with the steel pipe, and the included angle is 30° in the middle of the bolt; the stiffener F is the stiffener of P325 pipe and guide beam web, the included angle of the stiffener is 90°, and the M20 high-strength bolt connection pair is uniformly and symmetrically arranged, and the included angle is 30°.

10. The new type steel girder structure according to claim 1, characterized in that, The flange A (71) is suitable for connecting with P325 pipe, the flange B is suitable for connecting with horizontal connection middle horizontal vertical rod, and the flange C (73) is suitable for connecting with inclined rod. Flange B (72) is welded with P325 pipe to ensure that the minimum flange pipe length is 20 cm, flange C (73) is welded with P325 pipe to ensure that the minimum side pipe length is 25 cm, and the welding intersection line should be developed according to the angle of inclination.

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