Error self-adapting assembled triangular girder bridge steel cross beam

Abstract

The application discloses an error self-adapting fabricated triangular beam bridge steel cross beam, which is triangular as a whole and comprises a rotatable connecting node structure, a pre-buried component for being connected with a bridge, a transverse telescopic rod at the bottom and arc-shaped oblique supporting rod members at two sides, the rotatable connecting node structure comprises a first connecting node structure and a second connecting node structure, upper ends of the arc-shaped oblique supporting rod members at the two sides are connected through the first connecting node structure, two ends of the transverse telescopic rod are connected with lower ends of the arc-shaped oblique supporting rod members at the two sides through the second connecting node structure, and the second connecting node structure is connected with the bridge through the pre-buried component. The pin shaft connection and length adjustment of the end of the transverse rod solve the dislocation of the cross beam caused by the assembly error in the field construction, and efficient construction is ensured, meanwhile, the arc-shaped oblique supporting rod members make the steel cross beam component have certain vertical load buffering capacity, and the durability of the main beam concrete and the steel cross beam is improved.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, and specifically relates to an error-adaptive prefabricated steel diaphragm for a triangular beam bridge. Background Technology

[0002] To improve the lateral stiffness of prefabricated T-beam bridges, concrete diaphragms connect the main beams into a whole. This technology has been widely used in bridge engineering. However, since the concrete diaphragms need to be cast on-site simultaneously with the post-cast strips, they are prone to non-coplanarity and misalignment due to measurement and construction errors. This method cannot meet the construction requirements of rapid bridge assembly, affects the aesthetics of the bridge, weakens the lateral reinforcement and stability effect of the concrete diaphragms, and hinders the high-quality development of bridge transportation.

[0003] To improve the installation efficiency of precast bridges, steel crossbeams can be prefabricated by welding in the factory and then transported to the site for installation. This structure also has advantages such as lighter weight. To avoid high-altitude welding operations, steel crossbeams and T-beams are mostly connected by bolts. However, in actual installation, precast T-beams may have positional deviations in both the lateral and vertical directions. When the crossbeam members need to be rotated due to construction errors, the bolt holes may be difficult to install due to significant discrepancies with the original design. Therefore, adaptive error-eliminating devices need to be installed at the steel crossbeam members. In addition, frequent personnel movement and rapidly increasing logistics demands place higher demands on the fatigue performance of transportation facilities and the driving comfort of vehicles. Triangular steel crossbeams with straight members cause more noticeable vehicle bumps due to their greater vertical stiffness. At the same time, the stress amplitude of the diagonal members on both sides of the steel crossbeam varies greatly, which may lead to fatigue fracture. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an error-adaptive prefabricated triangular beam bridge steel diaphragm.

[0005] The specific technical solution is as follows: An error-adaptive prefabricated triangular beam bridge steel diaphragm, which is triangular in shape, includes a rotatable connection node structure, embedded components for connection with the bridge, a bottom transversely telescopic member, and two sides of arc-shaped inclined support members. The rotatable connection node structure includes a first connection node structure and a second connection node structure. The upper ends of the two sides of the arc-shaped inclined support members are connected through the first connection node structure, and the two ends of the transversely telescopic member are connected to the lower ends of the two sides of the arc-shaped inclined support members through the second connection node structure. The second connection node structure is connected to the bridge through the embedded components.

[0006] Furthermore, the first connection node structure includes a first node connecting plate, a first node reinforcing plate, and a first pin. The upper end of the arc-shaped inclined support rod is provided with a first ear plate. The first pin passes through the first node reinforcing plate and the first ear plates of the arc-shaped inclined support rods on both sides, realizing the rotatable connection of the arc-shaped inclined support rods on both sides. The first node connecting plate is located above the first node reinforcing plate, and the upper surface of the first node reinforcing plate is provided with shear nails.

[0007] Furthermore, a reinforcing rib is provided between the first node reinforcing plate and the first node connecting plate.

[0008] Furthermore, the second connection node structure includes a second node connection plate, a second node reinforcing plate, and a second pin. The lower end of the arc-shaped inclined support member is provided with a second ear plate, and both ends of the transverse telescopic member are provided with third ear plates. The second pin passes through the second node reinforcing plate, the second ear plate, and the third ear plate to realize the connection between the arc-shaped inclined support member and the transverse telescopic member. The second node connection plate is located on the outside of the second node reinforcing plate and is connected to the embedded component.

[0009] Furthermore, the embedded components include embedded steel plates and first bolts. The first bolts pass through the second node connecting plate and the embedded steel plates in sequence to fix the steel crossbeams to the bridge.

[0010] Furthermore, the transversely telescopic member includes a straight round tube, a connecting structure, and an outer tube. One end of the straight round tube is fixedly connected to one end of the connecting structure. The connecting structure has an opening, and the outer tube has a waist-shaped hole. The connecting structure is inserted into one end of the outer tube. The second bolt passes through the waist-shaped hole and the opening in sequence to connect the connecting structure and the outer tube. The other end of the outer tube is connected to a third ear plate.

[0011] Furthermore, the minimum radius of curvature of the arc-shaped oblique support member is 1.5 times the length of the lateral telescopic member.

[0012] The beneficial effects of this invention are as follows: 1) This invention solves the problem of misalignment of transverse diaphragms caused by on-site construction assembly errors through pin connection and length adjustment device at the ends of transverse members, ensuring efficient construction and providing a new solution for the defects of traditional concrete transverse diaphragms; 2) The invention uses arc-shaped oblique support members to enable the steel crossbeam components to have a certain vertical load buffering capacity, which improves the durability of the main beam concrete and the steel crossbeam to a certain extent, while improving the comfort of daily vehicle driving. 3) The top node plate of the present invention is cast together with the shear studs and the post-cast strip, which enables the steel diaphragm to adapt to vertical installation errors, while improving the overall reliability of the bridge and reducing the later maintenance work. 4) The connection nodes of this invention use bolts and pins instead of welding, which avoids high-altitude welding operations on site from the design, so as to facilitate on-site installation, save labor costs, reduce construction difficulty, effectively solve construction errors, and improve assembly efficiency. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the steel crossbeam of the present invention; Figure 2 This is a schematic diagram of the assembly of the steel crossbeam of the present invention; Figure 3 This is a schematic diagram of the pin connection method of the present invention; Figure 4 This is a three-dimensional structural diagram of the connection structure of the present invention; Figure 5 This is a three-dimensional structural diagram of the outer sleeve of the present invention.

[0014] In the diagram: 1. Rotatable connection node structure; 11. First connection node structure; 111. First node connecting plate; 112. First node reinforcing plate; 113. First pin; 114. Reinforcing rib; 12. Second connection node structure; 121. Second node connecting plate; 122. Second node reinforcing plate; 123. Second pin; 2. Embedded component; 21. Embedded steel plate; 22. First bolt; 3. Laterally telescopic rod; 31. Third ear plate; 32. Straight round tube; 33. Connection structure; 331. Opening; 34. Outer sleeve; 341. Waist-shaped hole; 35. Second bolt; 4. Arc-shaped oblique support rod; 41. First ear plate; 42. Second ear plate; 5. Shear stud. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited thereto.

[0016] like Figure 1 and Figure 2As shown, an error-adaptive prefabricated triangular beam bridge steel diaphragm, which is triangular in shape, includes a rotatable connection node structure 1, a pre-embedded component 2 for connection with the bridge, a transversely telescopic member 3 at the bottom, and arc-shaped inclined support members 4 on both sides. The rotatable connection node structure 1 includes a first connection node structure 11 and a second connection node structure 12. The first connection node structure 11 includes a first node connection plate 111, a first node reinforcing plate 112, and a first pin 113. The upper end of the arc-shaped inclined support member 4 is provided with... A first ear plate 41 is provided, and a first pin 113 passes through the first ear plate 41 of the first node reinforcing plate 112 and the first ear plate 41 of the arc-shaped inclined support rods 4 on both sides, realizing the rotatable connection of the arc-shaped inclined support rods 4 on both sides. The first node connecting plate 111 is located above the first node reinforcing plate 112, and the upper surface of the first node reinforcing plate 112 is provided with shear nails 5, which are cast together with the post-cast strip. Triangular reinforcing ribs 114 are symmetrically provided between the first node reinforcing plate 112 and the first node connecting plate 111, such as... Figure 3 As shown, the second connecting node structure 12 includes a second node connecting plate 121, a second node reinforcing plate 122, and a second pin 123. The lower end of the arc-shaped inclined support member 4 is provided with a second ear plate 42, and both ends of the transversely telescopic member 3 are provided with third ear plates 31. The second pin 123 passes through the second node reinforcing plate 122, the second ear plate 42, and the third ear plate 31, thus connecting the arc-shaped inclined support member 4 and the transversely telescopic member 3. The rotatable connecting node structure 1 ensures that the angle between the arc-shaped inclined support member 4 and the transversely telescopic member 3 can be finely adjusted. The second node connecting plate 121 is located outside the second node reinforcing plate 122, and is connected to the embedded component 2. The embedded component 2 includes an embedded steel plate 21 and a first bolt 22. The first bolt 22 passes through the second node connecting plate 121 and the embedded steel plate 21 in sequence, fixing the steel crossbeam to the bridge. The transversely telescopic member 3 includes a straight circular tube 32, etc. Figure 4 The connection structure 33 shown and as follows Figure 5The outer sleeve 34 shown has one end of a straight circular tube 32 fixedly connected to one end of a connecting structure 33. The connecting structure 33 has an opening 331, and the outer sleeve 34 has a slotted hole 341. The connecting structure 33 is inserted into one end of the outer sleeve 34. A second bolt 35 passes through the slotted hole 341 and the opening 331 in sequence to connect the connecting structure 33 and the outer sleeve 34. The other end of the outer sleeve 34 is connected to a third ear plate 31. The minimum radius of curvature of the arc-shaped inclined support member 4 is 1.5 times the length of the transversely expandable member 3. At this point, the vertical stiffness decreases to 1 / 15 of the stiffness of a straight member with a uniform cross-section. According to calculations, theoretically, reducing the cross-sectional area to reduce vertical stiffness can only reduce stiffness by 1 / 5, and the reduction in cross-sectional area makes the inclined support more prone to buckling under stress. Therefore, the arc-shaped circular tube is more suitable for practical applications. The smaller the curve radius, the greater the decrease in vertical stiffness of the steel transverse diaphragm; the larger the curve radius, the smaller the weakening effect on the vertical stiffness of the steel transverse diaphragm.

[0017] The main fabrication process of the steel diaphragm is completed in the factory. The transverse telescopic member 3 and the arc-shaped inclined support member 4 are connected into a whole by the first pin 113 and the second pin 123. On the construction site, the steel diaphragm needs to be hoisted to the installation position as a whole. According to the actual error, the transverse telescopic member 3 is adjusted by pulling or pushing the outer sleeve 34 to meet the actual installation length requirements at the bottom, so that the embedded components 2 at both ends can be accurately connected to the bridge. The second bolt 35 is tightened. While adjusting the length, the arc-shaped inclined support member 4 rotates. According to the position of the first node connecting plate 111 and the shear nail 5, the position of the steel diaphragm is adjusted so that it is flush with the post-pouring strip, which facilitates the subsequent integral pouring.

Claims

1. An error-adaptive prefabricated triangular beam bridge steel diaphragm, characterized in that, The whole structure is triangular, including a rotatable connection node structure (1), a pre-embedded component (2) for connecting with the bridge, a horizontal telescopic member (3) at the bottom and arc-shaped inclined support members (4) on both sides. The rotatable connection node structure (1) includes a first connection node structure (11) and a second connection node structure (12). The upper ends of the arc-shaped inclined support members (4) on both sides are connected through the first connection node structure (11). The two ends of the horizontal telescopic member (3) are connected to the lower ends of the arc-shaped inclined support members (4) on both sides through the second connection node structure (12). The second connection node structure (12) is connected to the bridge through the pre-embedded component (2). The first connecting node structure (11) includes a first node connecting plate (111), a first node reinforcing plate (112), and a first pin (113). The upper end of the arc-shaped inclined support rod (4) is provided with a first ear plate (41). The first pin (113) passes through the first node reinforcing plate (112) and the first ear plates (41) of the arc-shaped inclined support rods (4) on both sides, so as to realize the rotatable connection of the arc-shaped inclined support rods (4) on both sides. The first node connecting plate (111) is located above the first node reinforcing plate (112), and the upper surface of the first node reinforcing plate (112) is provided with shear nails (5). The second connection node structure (12) includes a second node connection plate (121), a second node reinforcing plate (122), and a second pin (123). The lower end of the arc-shaped inclined support rod (4) is provided with a second ear plate (42), and the two ends of the transverse telescopic rod (3) are provided with third ear plates (31). The second pin (123) passes through the second node reinforcing plate (122), the second ear plate (42), and the third ear plate (31) to realize the connection between the arc-shaped inclined support rod (4) and the transverse telescopic rod (3). The second node connection plate (121) is located on the outside of the second node reinforcing plate (122), and the second node connection plate (121) is connected to the embedded component (2). The transverse telescopic rod (3) includes a straight round tube (32), a connecting structure (33) and an outer tube (34). One end of the straight round tube (32) is fixedly connected to one end of the connecting structure (33). The connecting structure (33) has an opening (331), and the outer tube (34) has a waist-shaped hole (341). The connecting structure (33) is inserted into one end of the outer tube (34). The second bolt (35) passes through the waist-shaped hole (341) and the opening (331) in sequence to realize the connection between the connecting structure (33) and the outer tube (34). The other end of the outer tube (34) is connected to the third ear plate (31). The minimum radius of curvature of the arc-shaped oblique support member (4) is 1.5 times the length of the transverse telescopic member (3).

2. The error-adaptive prefabricated triangular beam bridge steel diaphragm as described in claim 1, characterized in that, A reinforcing rib (114) is provided between the first node reinforcing plate (112) and the first node connecting plate (111).

3. The error-adaptive prefabricated triangular beam bridge steel diaphragm as described in claim 1, characterized in that, The embedded component (2) includes an embedded steel plate (21) and a first bolt (22). The first bolt (22) passes through the second node connecting plate (121) and the embedded steel plate (21) in sequence to fix the steel crossbeam on the bridge.

Images