An adjustable truss beam for hybrid solid web variable cross-section truss beams

Abstract

The utility model relates to a kind of adjusting truss girder for mixed solid web member variable cross-section truss girder, including upper and lower beam;Upper and lower beam are symmetrically distributed between, and the both ends of upper and lower beam are equipped with adjusting bolt hole, three equal-interval distribution vertical web members and two oblique web members are installed between upper and lower beam, two oblique web members are located between three vertical web members and are distributed as "∧" type, and the intersection between oblique web member and vertical web member is fixedly connected by patch plate, patch plate is fixed on the lower end surface of upper beam or the upper end surface of lower beam;The utility model is by using upper and lower beam, and vertical web member and two oblique web members are set between two, ensure strength and stability, and adjusting bolt hole is equipped at the both ends of upper and lower beam, can be flexibly combined with mixed solid web member variable cross-section truss girder, to adapt to the installation demand under multiple span, and the combination degree of freedom is higher.

Description

Technical Field

[0001] This utility model belongs to the field of engineering construction technology, and in particular relates to an adjustable truss beam for a mixed solid web variable cross section truss beam. Background Technology

[0002] With urban development, urban land resources are becoming increasingly scarce. Existing roads and bridges often cannot meet the growing travel needs of the people, making the development of transportation systems into higher-level spaces and underground infrastructure an inevitable trend. Constructing elevated bridges (hereinafter referred to as "new bridges") above the projection surface of existing double-span separated bridges (hereinafter referred to as "old bridges") to alleviate existing traffic pressure is often a better option. Compared to building on newly acquired land, this method saves land resources and significantly reduces the hassles associated with land acquisition, such as house demolition, pipeline relocation, and adjustments to existing roads, thus saving substantial construction investment.

[0003] When constructing a new bridge above the projection surface of an old bridge, the underlying structure of the old bridge often needs to be preserved intact during construction. In this case, the cap beam structure often adopts a three-column structure with a single pile and a single column (one pier on each side of the median strip and edge line of the two bridge spans). When the old bridge is wide, the span of the new bridge cap beam increases accordingly to meet the crossing requirements. When using a three-column prestressed concrete cap beam with a single pile and a single column, considering the heavy self-weight of the cap beam structure and the weak load-bearing capacity of the old bridge, the temporary load-bearing formwork cannot be supported on the old bridge during construction. Therefore, the temporary load-bearing formwork needs to span the old bridge laterally, which places high demands on the strength, stiffness, and stability of the support. Using conventional 321, HD200, and XT300 type prefabricated Bailey beams or large-size steel structures, the strength, stiffness, and stability of the load-bearing support often do not meet the requirements of current specifications. Therefore, there is a type of truss beam on the market that uses mixed solid-web members with variable cross-sections. However, the segment length of this existing "mixed solid-web member variable cross-section truss beam" is 15m, and the dimensions are fixed, making it unsuitable for various length variations and combinations, thus hindering its flexible application in project construction. Our company has developed a truss beam with solid-web members at both ends and a truss beam in the middle, allowing the entire length of the mixed solid-web member variable cross-section truss beam to be adjustable. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an adjustable truss beam for a mixed solid web variable cross-section truss beam, so as to solve the disadvantage that the mixed solid web variable cross-section truss beam cannot be adapted to various length changes.

[0005] The purpose of this utility model is achieved through the following technical solution: an adjustable truss beam for a mixed solid-web variable cross-section truss beam includes an upper truss and a lower truss; the upper truss and the lower truss are symmetrically distributed, and both ends of the upper truss and the lower truss are provided with adjusting bolt holes; three vertical web members and two diagonal web members are installed between the upper truss and the lower truss; the two diagonal web members are located between the three vertical web members and are distributed in a "∧" shape; and the junction point between the diagonal web members and the vertical web members is fixedly connected by a connecting plate, which is fixed to the lower end face of the upper truss or the upper end face of the lower truss.

[0006] The beneficial effects of this utility model are as follows: Compared with the prior art, by adopting upper and lower axial members and setting vertical web members and two diagonal web members between them, the strength and stability are ensured. In addition, the upper and lower axial members are provided with adjusting bolt holes at both ends, which can be flexibly combined with the mixed solid web member variable cross section truss beam to adapt to the installation requirements under various spans, and the degree of freedom of combination is higher.

[0007] Preferably, the upper truss includes a first top plate, a first bottom plate, a first web plate, and a first central stiffening plate. The first top plate and the first bottom plate are respectively fixed to the upper and lower ends of the first web plate. The first central stiffening plate has four pieces, which are symmetrically distributed in pairs and fixed to both sides of the first web plate. A first vertical stiffening rib is fixed between two first central stiffening plates along the height direction of the first web plate. Since the upper truss serves as the main supporting force in the actual operation of the mixed solid web variable cross-section truss beam, the load-bearing capacity and rigidity of the upper truss are greatly improved by the two first central stiffening plates and the first vertical stiffening ribs.

[0008] Preferably, the lower chord includes a second top plate, a second bottom plate, a second web plate, and a second central reinforcing plate. The second top plate and the second bottom plate are respectively fixed to the upper and lower ends of the second web plate. The second central reinforcing plate consists of two pieces, which are symmetrically distributed and fixed on both sides of the second web plate. The two pieces of the second central reinforcing plate are located on the side of the second bottom plate. A second vertical stiffening rib is fixed between the second central reinforcing plate and the second top plate. By adding the second central reinforcing plate and the second vertical stiffening rib, the rigidity of the lower chord is greatly improved. Furthermore, by placing the second central reinforcing plate closer to the side of the second bottom plate, the lower chord becomes more flexible, and in conjunction with the upper chord, it achieves higher load-bearing strength.

[0009] Preferably, the adjusting bolt holes are respectively located on the two end planes of the first web and the second web; this facilitates the adjustment and installation between adjacent adjusting truss beams.

[0010] Preferably, both the vertical web members and the diagonal web members include two channel steels, which are distributed opposite each other and arranged with their backs facing outwards. The net distance between the edges of the webs of the two channel steels is 200mm. This not only makes splicing and fixing more convenient, but also improves the strength.

[0011] Preferably, several connecting plates are provided on the two outer sides between the two channel steels, which improves the overall strength of the web member. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of the adjustable truss beam of this utility model.

[0013] Figure 2 This is a top view schematic diagram of the adjustable truss beam structure of this utility model.

[0014] Figure 3 This is a side view schematic diagram of the adjustable truss beam structure of this utility model.

[0015] The labels in the attached diagram are as follows: 1. Upper axial member; 2. Lower axial member; 3. Adjusting bolt hole; 4. Vertical web member; 5. Diagonal web member; 6. Connecting plate; 7. Channel steel; 8. Connecting plate; 11. First top plate; 12. First bottom plate; 13. First web plate; 14. First central reinforcing plate; 15. First vertical stiffening rib; 21. Second top plate; 22. Second bottom plate; 23. Second web plate; 24. Second central reinforcing plate; 25. Second vertical stiffening rib. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings: as shown in the drawings Figures 1 to 3As shown, this utility model includes an upper truss 1 and a lower truss 2. The upper truss 1 and the lower truss 2 are symmetrically distributed, and both ends of the upper truss 1 and the lower truss 2 are provided with adjusting bolt holes 3. Three vertical web members 4 and two diagonal web members 5 are installed between the upper truss 1 and the lower truss 2 at equal intervals. The two diagonal web members 5 are located between the three vertical web members 4 and are distributed in a "∧" shape. The junction point between the diagonal web members 5 and the vertical web members 4 is fixedly connected by a connecting plate 6, which is fixed to the lower end face of the upper truss 1 or the upper end face of the lower truss 2. The web members are connected to the upper and lower trusses and the connecting plate by welding. According to the length requirements of the mixed solid web variable cross-section truss beam on the actual site, the upper and lower trusses can be made to a fixed size during the material cutting process, and then spliced ​​after forming. By cooperating with the adjusting bolt holes 3, the length of the mixed solid web variable cross-section truss beam can be adjusted. It is suitable for various length changes and combinations, so as to be flexibly applied to project construction. It has the following advantages: 1. High load-bearing capacity, stiffness and stability: It can be used in combination with mixed solid web variable cross-section truss beams to meet the load-bearing requirements of large-span structures; 2. High degree of freedom of combination: It can be flexibly combined with mixed solid web variable cross-section truss beams to adapt to the installation requirements of various spans; 3. Simple installation and dismantling: The whole process can be completed by only 3 workers and one 25T truck crane; 4. Convenient material procurement: All materials are conventional and easy to procure.

[0017] The upper chord 1 includes a first top plate 11, a first bottom plate 12, a first web plate 13, and a first central reinforcing plate 14. The first top plate 11 and the first bottom plate 12 are respectively fixed to the upper and lower ends of the first web plate 13. The first central reinforcing plate 14 is provided in four pieces and is symmetrically distributed in pairs on both sides of the first web plate 13. A first vertical stiffening rib 15 is fixed between the two first central reinforcing plates 14 along the height direction of the first web plate 13.

[0018] The lower chord 2 includes a second top plate 21, a second bottom plate 22, a second web plate 23, and a second central reinforcing plate 24. The second top plate 21 and the second bottom plate 22 are respectively fixed to the upper and lower ends of the second web plate 23. The second central reinforcing plate 24 is provided in two pieces and is symmetrically distributed and fixed on both sides of the second web plate 23. The two second central reinforcing plates 24 are located on the side of the second bottom plate 22. A second vertical stiffening rib 25 is fixed between the second central reinforcing plate 24 and the second top plate 21.

[0019] The main truss members are constructed of Q355 welded steel, with double-sided fillet welds at all connections. The weld leg between the web and the top and bottom plates is no less than 8mm, and the weld leg between the web and the stiffening ribs is no less than 6mm. Except for the truss members with a web thickness of 12mm that is thickened to 25mm at the connection points (8mm), all other webs are 20mm thick, 400mm wide, and 540mm high, and are made of Q355 steel. Adjacent truss members are connected using M30 high-strength bolts. The connecting plates are 20mm thick, and the adjusting bolt holes are all standard 33mm round holes.

[0020] The adjusting bolt holes 3 are respectively located on the two end planes of the first web plate 13 and the second web plate 23.

[0021] Both the vertical web member 4 and the diagonal web member 5 include two channel steels 7, which are made of Q235 steel. The two channel steels 7 are distributed opposite each other and are set with their backs facing outwards. The net distance between the edges of the webs of the two channel steels 7 is 200mm.

[0022] Several connecting plates 8 are provided on the two outer sides between the two channel steels 7.

[0023] The manufacturing method of this utility model is as follows: First, make the upper rod 1 and the lower rod 2; then, weld the connecting plate 6 onto the upper rod 1 and the lower rod 2; finally, weld the vertical web member 4 and the diagonal web member 5 between the connecting plate 6 and the upper rod 1 and the lower rod 2.

[0024] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An adjustable truss beam for a mixed solid-web variable cross-section truss beam, comprising an upper chord (1) and a lower chord (2); characterized in that: The upper rod (1) and the lower rod (2) are symmetrically distributed, and both ends of the upper rod (1) and the lower rod (2) are provided with adjusting bolt holes (3). Three vertical web members (4) and two diagonal web members (5) are installed between the upper rod (1) and the lower rod (2) at equal intervals. The two diagonal web members (5) are located between the three vertical web members (4) and are distributed in a "∧" shape. The intersection point between the diagonal web members (5) and the vertical web members (4) is fixedly connected by a connecting plate (6). The connecting plate (6) is fixed on the lower end face of the upper rod (1) or the upper end face of the lower rod (2).

2. The adjustable truss beam for a mixed solid-web variable cross-section truss beam according to claim 1, characterized in that: The upper rod (1) includes a first top plate (11), a first bottom plate (12), a first web plate (13) and a first central reinforcing plate (14). The first top plate (11) and the first bottom plate (12) are respectively fixed on the upper and lower ends of the first web plate (13). The first central reinforcing plate (14) has four pieces and is symmetrically distributed in pairs on both sides of the first web plate (13). A first vertical stiffening rib (15) is fixed between the two first central reinforcing plates (14) along the height direction of the first web plate (13).

3. The adjustable truss beam for a mixed solid-web variable cross-section truss beam according to claim 2, characterized in that: The lower axial member (2) includes a second top plate (21), a second bottom plate (22), a second web plate (23), and a second central reinforcing plate (24). The second top plate (21) and the second bottom plate (22) are respectively fixed on the upper and lower ends of the second web plate (23). The second central reinforcing plate (24) has two pieces and is symmetrically distributed and fixed on both sides of the second web plate (23). The two pieces of the second central reinforcing plate (24) are located on the side of the second bottom plate (22). A second vertical stiffening rib (25) is fixed between the second central reinforcing plate (24) and the second top plate (21).

4. The adjustable truss beam for a mixed solid-web variable cross-section truss beam according to claim 3, characterized in that: The adjusting bolt holes (3) are respectively located on the two end planes of the first web plate (13) and the second web plate (23).

5. The adjustable truss beam for a mixed solid-web variable cross-section truss beam according to claim 1, characterized in that: Both the vertical web member (4) and the oblique web member (5) include two channel steels (7), and the two channel steels (7) are distributed relative to each other and are arranged with their backs facing outwards. The net distance between the edges of the webs of the two channel steels (7) is 200mm.

6. The adjustable truss beam for a mixed solid-web variable cross-section truss beam according to claim 5, characterized in that: Several connecting plates (8) are provided on the two outer sides between the two channel steels (7).

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