Arch rib connecting structure based on PBL shear connecting keys

Abstract

The invention relates to the field of steel structure arch bridges, in particular to an arch rib connecting structure based on PBL shear connecting keys, which comprises the PBL shear connecting keys, a joint connecting plate and two steel pipe arch ribs to be connected, a connecting section is formed at the butt joint part of the two steel pipe arch ribs, each steel pipe arch rib comprises an arch steel pipe and a plurality of longitudinal PBL shear keys, and the joint connecting plate is connected with the arch steel pipe. The longitudinal PBL shear keys are welded to the inner side wall of the arched steel pipe in the axis direction, and the longitudinal PBL shear keys extend outwards in the axial direction of the ends of the arched steel pipe. The longitudinal PBL shear keys of the two steel pipe arch ribs are connected in a welded mode. And the joint connecting plate is clamped at a seam between the two steel pipe arch ribs and is connected with the arched steel pipe in a welding manner. Flange plate connection is removed, the PBL connecting pieces are lengthened, the PBL shear connecting keys can stiffen the steel pipe arch while connecting the steel pipe arch ribs on the two adjacent sides, the PBL shear connecting keys can also serve as connecting pieces for shear transmission between steel pipes and filled concrete structures, and the bearing capacity of the whole main arch is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of steel structure arch bridges, and specifically to an arch rib connection structure based on PBL shear connection keys. Background Art

[0002] For long-span steel pipe arch bridges, higher requirements are imposed on the connection firmness of the arch ribs. At present, domestic steel pipe arch bridges usually adopt ordinary built-in steel wedge joints or direct welding at the lowest temperature to complete the instantaneous closure of the steel pipe arch bridge. For example, a closure device for a long-span steel pipe arch bridge disclosed in CN116837728A includes splints and a number of T-shaped connecting plates. All the T-shaped connecting plates are used to be distributed at intervals along the circumferential direction of the chord pipes at the closure position of the arch bridge. The T-shaped connecting plate includes a vertical plate and a horizontal plate. The height direction of the vertical plate is used to be arranged along the radial direction of the chord pipe, the length direction of the vertical plate is used to be arranged along the axial direction of the chord pipe, and both ends of the vertical plate are used to connect two chord pipes to be closed. The splints are used to clamp both sides of the splicing plate at the bottom of the two chord pipes to be closed and connect them.

[0003] However, the above-mentioned structure not only fails to meet the requirements of firmness, accuracy, and large internal force for the connection of the arch ribs of the steel pipe arch bridge, but also has a complex construction process and inconvenient operation. Summary of the Invention

[0004] Aiming at the problems that the connection joint structure of the steel pipe arch bridge in the prior art does not meet the requirements of firmness, accuracy, and large internal force, the present invention provides an arch rib connection structure based on PBL shear connection keys, which can improve the welding strength of the steel pipe arch ribs, ensure the firmness of the connection joints, and realize the rapidization of on-site construction operations.

[0005] The present invention is realized through the following technical solutions: An arch rib connection structure based on PBL shear connection keys includes PBL shear connection keys, joint connecting plates, and two steel pipe arch ribs to be connected. A connection section is formed at the butt-jointed part of the two steel pipe arch ribs. The steel pipe arch rib includes an arched steel pipe and a plurality of longitudinal PBL shear keys. The longitudinal PBL shear keys are welded to the inner side wall of the arched steel pipe along the axial direction, and the longitudinal PBL shear keys extend outward along the axial direction of the end of the arched steel pipe. The longitudinal PBL shear keys of the two steel pipe arch ribs are welded and connected. The joint connecting plate is clamped at the joint between the two steel pipe arch ribs and is welded to the arched steel pipe.

[0006] Preferably, the length of the extension of the longitudinal PBL shear key is 10 - 15 cm.

[0007] Preferably, the longitudinal PBL shear key is a stiffened steel plate, and a plurality of through holes are opened on the stiffened steel plate.

[0008] Preferably, the stiffening steel plate is welded to the inner wall of the arched steel pipe of the steel pipe arch rib along the axis direction of the steel pipe arch rib, and the stiffening steel plate is arranged perpendicular to the inner side wall of the arched steel pipe at the position where it is arranged.

[0009] Preferably, a plurality of the stiffening steel plates are evenly arranged in the arched steel pipe, and the plurality of stiffening steel plates are arranged symmetrically left and right with the longitudinal center line of the arched steel pipe as the symmetry line.

[0010] Preferably, the distance between two adjacent stiffening steel plates is arranged according to the actual stress condition of the steel pipe arch rib.

[0011] Preferably, a plurality of the through holes are evenly arranged on the stiffening steel plate.

[0012] Preferably, the distance between two adjacent through holes is arranged according to the actual stress condition of the position where the stiffening steel plate is located.

[0013] Preferably, the joint connecting plate includes a plurality of connecting steel plates with the same cross-section, and two adjacent connecting steel plates are welded together.

[0014] Preferably, the length of the connecting steel plate is equal to the sum of the extension lengths of the adjacent two side stiffening steel plates, and the thickness of the connecting steel plate is the same as the thickness of the arched steel pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the arch rib connection structure based on the PBL shear connection key of the present invention, the flange connection is removed. By extending the PBL connector, while the PBL shear connection key connects the adjacent two side steel pipe arch ribs, it can also stiffen the steel pipe arch, and can also be used as a connector for shear force transfer between the steel pipe and the filled concrete structure, enhancing the bearing capacity of the entire main arch. The structure is simple in construction, reasonable in design, convenient in construction and low in cost, can significantly improve the welding strength of the steel pipe arch rib, ensure the firmness of the connection joint, and realize the rapidization of on-site construction operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the first specific implementation scheme of the structure of the present invention.

[0017] Figure 2 It is an external connection schematic diagram of the connection part of the first specific implementation scheme of the structure of the present invention.

[0018] Figure 3 It is an internal connection schematic diagram of the connection part of the first specific implementation scheme of the structure of the present invention.

[0019] Figure 4 It is an internal connection schematic diagram of the connection part of the second specific implementation scheme of the structure of the present invention.

[0020] Figure 5 Internal connection schematic diagram of the connection part of the second specific implementation scheme of the structure of the present invention.

[0021] Figure 6 Internal connection schematic diagram of the connection part of the second specific implementation scheme of the structure of the present invention.

[0022] In the figure, 1, steel pipe arch rib; 2, connection section; 3, PBL shear connection key; 4, through hole; 1-1, arched steel pipe; 2-1, joint connection plate. Specific implementation mode

[0023] The following further elaborates on the present invention in conjunction with specific embodiments, which is an explanation rather than a limitation of the present invention.

[0024] The present invention discloses an arch rib connection structure based on PBL shear connection keys. Referring to Figure 1 , 2 , 3, it includes a PBL shear connection key 3, a joint connection plate 2-1, and two steel pipe arch ribs 1 to be connected. A connection section 2 is formed at the butt joint of the two steel pipe arch ribs 1. The steel pipe arch rib 1 includes an arched steel pipe 1-1 and a plurality of longitudinal PBL shear keys. The longitudinal PBL shear keys are welded to the inner side wall of the arched steel pipe 1-1 along the axial direction, and the longitudinal PBL shear keys extend axially outward by 10-15 cm at the end of the arched steel pipe 1-1; the longitudinal PBL shear keys of the two steel pipe arch ribs 1 are welded and connected.

[0025] Among them, the longitudinal PBL shear key is a stiffened steel plate. The stiffened steel plate is welded to the inner wall of the arched steel pipe 1-1 of the steel pipe arch rib 1 along the axial direction of the steel pipe arch rib 1, and the stiffened steel plate is perpendicularly arranged with the inner side wall of the arched steel pipe 1-1 at the position where it is arranged.

[0026] A plurality of stiffened steel plates are evenly arranged in the arched steel pipe 1-1, and a plurality of stiffened steel plates are symmetrically arranged left and right with the longitudinal center line of the arched steel pipe 1-1 as the symmetry line. The cambers of the plurality of stiffened rib steel plates are all the same as the camber of the steel pipe arch rib 1, and the ends of the stiffened rib steel plates extend axially outward by 10-15 cm at the end of the steel pipe arch rib 1.

[0027] During the actual construction process, in order to ensure the firmness of the welding joint of two adjacent steel pipe arch ribs 1, the most crucial thing is to determine the number and spacing of the longitudinal PBL shear connection keys 3 and the structure of the PBL shear connection keys 3.

[0028] The spacing between two adjacent stiffening steel plates is arranged according to the actual stress condition of the steel pipe arch rib 1. The greater the force borne by the steel pipe arch rib 1, the smaller the spacing between two adjacent stiffening steel plates welded to the inner wall of the steel pipe arch rib 1, and the number of stiffening circular steel plates can be relatively increased; the smaller the force borne by the steel pipe arch rib 1, the larger the spacing between two adjacent stiffening steel plates welded to the inner wall of the steel pipe arch rib 1, and the number of stiffening circular steel plates can be relatively decreased. The specific spacing and number of the stiffening steel plates can be determined according to the actual use situation.

[0029] A plurality of through holes 4 are evenly formed in the stiffening steel plate, and the spacing between two adjacent through holes 4 is arranged according to the actual stress condition of the position where the stiffening steel plate is located. The greater the force borne by the steel pipe arch rib 1, the smaller the spacing between two adjacent through holes 4 on the stiffening steel plate, and the number of through holes 4 can be relatively increased; the smaller the force borne by the steel pipe arch rib 1, the larger the spacing between two adjacent through holes 4 on the stiffening steel plate, and the number of through holes 4 can be relatively decreased; the specific spacing and number of the through holes 4 can be determined according to the actual use situation.

[0030] The joint connecting plate 2-1 is clamped at the joint between two steel pipe arch ribs 1 and is welded to the arched steel pipe 1-1. Specifically, the joint connecting plate 2-1 includes a plurality of connecting steel plates with the same cross-section, and two adjacent connecting steel plates are welded. The length of the connecting steel plate is equal to the sum of the extended lengths of the adjacent two stiffening steel plates on both sides, and the thickness of the connecting steel plate is the same as the thickness of the arched steel pipe 1-1. The joint connecting plate 2-1 is firmly welded to the adjacent two steel pipe arch ribs 1, and construction operation holes for welding the joint connecting plate 2-1 to the arched steel pipe 1-1 of the two-side steel pipe arch ribs 1 and for welding the joint connecting plate 2-1 to the stiffening steel plate are provided on the connecting steel plate forming the joint connecting plate 2-1.

[0031] Embodiment 1 The cross-section of the arched steel pipe 1-1 is circular, and the joint connecting plate 2-1 is composed of four connecting steel plates with the same cross-section and in the shape of a quarter arc. When actually installing the PBL shear keys in the arched steel pipe 1-1, they are fastened to the inner side wall of the arched steel pipe 1-1 by welding. The stiffening steel plates are welded to the inner wall of the steel pipe arch rib 1 in its stress area. In this example, the number of the stiffening steel plates is 8.

[0032] During actual construction, first, the adjacent two steel pipe arch ribs 1 are arranged at the predetermined positions, and the stiffening steel plates extending on both sides at the connection section 2 are firmly welded; secondly, each section of the connecting steel plate forming the joint connecting plate 2-1 is clamped at the joint between two adjacent steel pipe arch ribs 1 and firmly welded to the arched steel pipe 1-1 of the steel pipe arch rib 1, and then it is firmly welded to the stiffening steel plate; finally, the joint connecting plate 2-1 is welded in a certain order.

[0033] Embodiment 2 As Figure 4 , Figure 5 , Figure 6 shown, in this embodiment, different from Embodiment 1: the cross-section of the arched steel pipe 1-1 is rectangular, and the joint connecting plate 2-1 is four rectangular steel plates, and the structures and connection relationships of the remaining parts are the same as those in Embodiment 1.

[0034] The above are only the preferred embodiments of the present invention and are not used to limit the technical solutions of the present invention in any way. Those skilled in the art should understand that without departing from the spirit and principle of the present invention, the technical solutions can be modified and replaced simply in several ways, and these modifications and replacements also fall within the protection scope covered by the claims.

Claims

1. An arch rib connection structure based on PBL shear connectors, characterized in that It includes PBL shear connectors (3), joint connecting plates (2-1) and two steel pipe arch ribs (1) to be connected. A connecting section (2) is formed at the butt-jointed part of the two steel pipe arch ribs (1). The steel pipe arch rib (1) includes an arched steel pipe (1-1) and a plurality of longitudinal PBL shear keys. The longitudinal PBL shear keys are welded to the inner side wall of the arched steel pipe (1-1) along the axial direction, and the longitudinal PBL shear keys extend axially outward from the end of the arched steel pipe (1-1). The longitudinal PBL shear keys of the two steel pipe arch ribs (1) are welded together. The joint connecting plate (2-1) is clamped at the joint between the two steel pipe arch ribs (1) and is welded to the arched steel pipe (1-1).

2. The arch rib connection structure based on the PBL shear connection key according to claim 1, characterized in that, The length of the extension of the longitudinal PBL shear key is 10-15 cm.

3. The arch rib connection structure based on the PBL shear connection key according to claim 1, characterized in that, The longitudinal PBL shear key is a stiffened steel plate, and a plurality of through holes (4) are formed in the stiffened steel plate.

4. The arch rib connection structure based on the PBL shear connection key according to claim 3, characterized in that, The stiffened steel plate is welded to the inner wall of the arched steel pipe (1-1) of the steel pipe arch rib (1) along the axial direction of the steel pipe arch rib (1), and the stiffened steel plate is vertically arranged with respect to the inner side wall of the arched steel pipe (1-1) at the position where it is arranged.

5. The arch rib connection structure based on the PBL shear connection key according to claim 3, characterized in that, A plurality of the stiffened steel plates are evenly arranged in the arched steel pipe (1-1), and a plurality of the stiffened steel plates are arranged symmetrically left and right with the longitudinal center line of the arched steel pipe (1-1) as the symmetry line.

6. The arch rib connection structure based on the PBL shear connection key according to claim 3, characterized in that, The distance between two adjacent stiffened steel plates is arranged according to the actual stress condition of the steel pipe arch rib (1).

7. The arch rib connection structure based on the PBL shear connection key according to claim 3, characterized in that A plurality of the through holes (4) are evenly arranged on the stiffened steel plate.

8. The arch rib connection structure based on the PBL shear connection key according to claim 3, characterized in that, The distance between two adjacent through holes (4) is arranged according to the actual stress condition of the position where the stiffened steel plate is located.

9. The arch rib connection structure based on the PBL shear connection key according to claim 1, wherein, The joint connecting plate (2-1) includes a plurality of connecting plates with the same cross section, and two adjacent connecting plates are welded together.

10. The arch rib connection structure based on the PBL shear connection key according to claim 9, characterized in that, The length of the connecting plate is equal to the sum of the extension lengths of the adjacent stiffened steel plates on both sides, and the thickness of the connecting plate is the same as the thickness of the arched steel pipe (1-1).

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