Novel dense cross beam plate-truss combined bridge deck system

Abstract

The invention relates to the technical field of bridges, and discloses a novel dense beam plate truss combined bridge deck system which comprises two chord members arranged in parallel and level, and the chord members and truss nodes are connected to form a continuous structure in the bridge direction. A plurality of cross beams are arranged between the chord members at intervals, and each cross beam comprises a cross beam upper wing plate, a cross beam lower wing plate and a cross beam web stiffening rib; a cross beam web plate is mounted between the cross beam upper wing plate and the cross beam lower wing plate, and the cross beam web plate and the cross beam web plate stiffening rib are connected with each other; a bridge deck slab is arranged above the cross beam, and longitudinal stiffening ribs and a transverse connecting plate are arranged below the bridge deck slab. The truss node area is not provided with a cross beam, so that the connecting structure of the truss node area is simplified, the fatigue details of the node area are reduced, and the risk of fatigue cracking of the node area is reduced; cross sections and sizes of the beams of the bridge deck system are consistent, rigidity differences of the beams are small, distribution of loads on the bridge deck system is more uniform, and the beams are arranged in a fish belly mode so that local rigidity of the bridge deck system can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wooden pallet processing, and in particular relates to a novel dense crossbeam, plate and truss combined bridge deck system. Background Art

[0002] Truss structures have been widely used in the main beams of various types of bridges, such as steel truss bridges, steel truss stiffening beams, etc. Truss main beams are generally composed of main trusses, connecting systems and bridge deck systems. The bridge deck system and connecting system act as force transmission structures to transfer the bridge deck load to the main trusses. In order to give full play to the role of the bridge deck system and improve the material utilization rate of the bridge deck system, the bridge deck system can be connected to the main truss to form a plate-truss combined bridge deck system. At this time, the bridge deck system, in addition to being a force transmission structure, also bears external loads together with the main truss.

[0003] The arrangement of longitudinal and transverse beams of the bridge deck system is the key to the design of the plate-truss combined bridge deck system. The existing plate-truss combined bridge deck system can be roughly divided into two categories according to the different arrangements of longitudinal and transverse beams: ①, longitudinal and transverse beam and plate-truss combined bridge deck system, ②, dense transverse beam and plate-truss combined bridge deck system.

[0004] A deck system beam (node ​​beam) is set at the truss node, and multiple longitudinal beams are arranged between the node beams to form a longitudinal and transverse beam-plate-truss combined deck system. At this time, the bridge deck and the longitudinal beam transfer the deck load to the node beam along the longitudinal direction of the bridge, and then transfer it to the truss node along the transverse direction of the bridge through the node beam. The force transmission path is clear, and the beam dominates the transfer of the deck load, resulting in complex forces at the beam and truss nodes, requiring larger structural dimensions and complex connection structures to ensure the transfer of the deck load.

[0005] Multiple cross beams (inter-section cross beams) are set between the node cross beams and the number of longitudinal beams is reduced to form a dense cross beam plate truss combined with the bridge deck system, which increases the transmission path of the bridge deck load. The bridge deck load is not only transmitted to the truss node through the node cross beam, but also transmitted to the chord through the inter-section cross beam and then to the truss node. The more inter-section cross beams there are, the more uniform the transmission of the bridge deck load is. However, in addition to the bridge deck load directly transmitted by the node cross beam, the truss node also includes the bridge deck load transmitted by the chord. It is difficult to clearly understand the force transmission mechanism of the truss node, which reduces the reliability of the node force.

[0006] From the existing design of plate-truss combined bridge deck system, the load transmission path of the bridge deck system is complex and the load distribution is uneven, which leads to the following problems: 1. The forces on truss nodes are complex. In addition to the in-plane loads in the truss structure, they are also subject to out-of-plane loads transmitted by the node beams and chords. The composition of multiple loads will reduce the bearing capacity and fatigue performance of the nodes, and at the same time reduce the stiffness and stability of the bridge deck system.

[0007] 2. The existence of node beams requires the addition of more stiffening ribs and diaphragms at the truss node positions, which not only increases the manufacturing difficulty, but also increases the fatigue details at the nodes, further reducing the fatigue performance of the nodes.

[0008] 3. There are many types and sizes of cross-sections of longitudinal beams, transverse beams, cross-connectors and other components, which reduces the efficiency of bridge deck system production in factories and makes it difficult to achieve standardized production.

[0009] 4. When a truss-type cross-connected plate truss combined with a bridge deck system is applied to a double-deck bridge structure, the clearance of the lower deck will be reduced, affecting the driving safety of the lower deck. In view of this, the present invention is proposed. Summary of the invention

[0010] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: A new type of dense beam plate truss combined bridge deck system, including two chords arranged in parallel, the chords are connected to the truss nodes to form a continuous structure along the bridge direction; a plurality of beams are arranged between the chords, and the beams include upper wing plates, lower wing plates and web stiffening ribs of the beams; A crossbeam web is installed between the crossbeam upper wing plate and the crossbeam lower wing plate, and the crossbeam web and the crossbeam web stiffening ribs are connected to each other; a bridge deck is arranged above the crossbeam, and longitudinal stiffening ribs and transverse connecting plates are arranged below the bridge deck.

[0011] As a preferred embodiment of the present invention, the chord is arranged flush with the truss node, no cross beam is provided at the truss node, and the cross beams are arranged at equal intervals along the direction of the bridge.

[0012] As a preferred embodiment of the present invention, the upper wing plate before the cross beam is connected to the bridge deck is used as a component of the cross beam cross section to form an I-shaped cross section to resist the deadweight of the cross beam.

[0013] As a preferred embodiment of the present invention, after the cross beam is connected to the bridge deck, the upper wing plate serves as a horizontal stiffening rib of the cross beam of the bridge deck to enhance the stability of the web of the cross beam.

[0014] As a preferred embodiment of the present invention, the beam web stiffening ribs are installed on the beam web at intervals, and the heights of the two sides of the beam are lower than the height of the center beam.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. No crossbeam is set in the truss node area, which simplifies the connection structure of the truss node area, reduces the fatigue details of the node area, and reduces the risk of fatigue cracking in the node area.

[0016] 2. The load transmission path of the bridge deck is clear: bridge deck → beam → chord → truss node. The node does not directly bear the out-of-plane load transmitted by the beam, and the local structure of the node can be designed according to the in-plane force.

[0017] 3. The cross-section and size of the bridge deck system beams are consistent and are all connected to the chords. The stiffness differences of the beams are small, and the load distribution on the bridge deck system is more even. The beams are arranged in a fish belly style, which is beneficial to improving the local stiffness of the bridge deck system.

[0018] 4. The longitudinal stiffening ribs of the upper wing plate and the web of the bridge deck beam can ensure the stability of the beam during the production of the beam. The upper wing plate can be used as a connecting plate to connect with the bridge deck to realize the prefabrication of the bridge deck system. The upper wing plate can also be used as a transverse stiffening rib of the bridge deck beam to further improve the local stiffness and stability of the bridge deck system.

[0019] 5. The cross-section of the components is simple and the dimensions of the beams remain unchanged, which reduces the types of panels required for factory production, improves production efficiency and reduces production costs, and enables standardized production of plate-truss combined bridge deck systems.

[0020] In summary, the present invention has a simple structure, reasonable design, convenient manufacture, low cost, and excellent mechanical properties, and can effectively solve the problems of complex force on nodes in the existing plate-truss combined bridge deck system and difficulty in achieving standardized manufacture.

[0021] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached picture: Figure 1 It is a general layout diagram of an embodiment of the present invention in a double-layer steel truss stiffening beam.

[0023] Figure 2 This is a schematic diagram of the structure of Example 1 of the present invention.

[0024] Figure 3 It is a cross-sectional schematic diagram of Example 1 of the present invention.

[0025] Figure 4 It is a schematic top view of embodiment 1 of the present invention.

[0026] In the figure: 1. chord; 2. truss node; 3. bridge deck; 4. longitudinal stiffening ribs of bridge deck; 5. transverse connecting plate of bridge deck; 6. upper wing plate of cross beam; 7. lower wing plate of cross beam; 8. web plate of cross beam; 9. stiffening ribs of web plate of cross beam. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention. Example

[0028] like Figures 1 to 3 As shown, a new type of dense beam plate truss combined bridge deck system includes two chords 1 arranged in parallel, and the chords 1 are connected with truss nodes 2 to form a continuous structure along the bridge direction; a plurality of beams are arranged between the chords 1, and the beams include upper flanges 6, lower flanges 7 and web stiffening ribs 9; A crossbeam web 8 is installed between the crossbeam upper wing plate 6 and the crossbeam lower wing plate 7, and the crossbeam web 8 and the crossbeam web stiffening rib 9 are connected to each other; a bridge deck 3 is arranged above the crossbeam, and longitudinal stiffening ribs 4 and transverse connecting plates 5 are arranged below the bridge deck 3. The chord 1 is arranged flush with the truss node 2, and no crossbeam is arranged at the truss node 2. The crossbeam is arranged at equal intervals along the bridge direction, and an arc groove is arranged at the bottom of the truss node 2, which is convenient for the later assembly to quickly connect the nodes through the arc groove to improve the assembly efficiency; the web of the crossbeam (that is, the plane part of the beam) is prone to local buckling when subjected to external loads. Stiffening ribs can effectively increase the stability of the web and prevent the occurrence of such buckling. Web buckling may cause the crossbeam to become unstable and affect the safety of the structure; when the steel beam is subjected to shear force, the web is the main force-bearing part. By adding stiffening ribs, the shear bearing capacity of the web can be increased to avoid cracks and deformation caused by excessive shear force. Example

[0029] The difference between the above embodiment and this embodiment is that: Figures 1 to 3 As shown, a new type of dense beam-plate truss combined with a bridge deck system, the upper wing plate 6 is used as a component of the beam cross section before the beam is not connected to the bridge deck 3, forming an I-shaped cross section to resist the deadweight of the beam, and after the beam is connected to the bridge deck 3, the upper wing plate 6 is used as a horizontal stiffening rib of the bridge deck system beam to enhance the stability of the beam web, the beam web stiffening ribs 9 are installed at intervals on the beam web 8, and the heights on both sides of the beam are lower than the height of the center beam.

[0030] The same type of plate parts of the crossbeam adopt the same plate thickness, and the crossbeam upper wing plate 6, the crossbeam lower wing plate 7, the web stiffening rib 9 and the crossbeam web 8 are connected by automated welding to form a crossbeam component; the longitudinal stiffening rib 4, the transverse connecting plate 5 and the bridge deck 3 are welded to form an orthotropic bridge deck; the bridge deck system transverse connecting plate 5 is connected to the crossbeam upper wing plate 6, so that the orthotropic bridge deck and the crossbeam component form a bridge deck system; finally, the bridge deck system is welded to the chord 1 to form an embodiment of the present invention.

[0031] The bridge deck of the present invention is reasonably and compactly arranged, the forces on each component are clear, the force transmission path is simple, and it is adapted to the requirements of multi-lane driving, and can be used for double-deck suspension bridges with large and super-large spans. It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present invention, and does not limit the present invention. Any modification, combination, replacement, improvement, etc. made under the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A new type of dense beam-plate-truss combined bridge deck system, characterized in that: It comprises two chords (1) arranged in parallel, the chords (1) being connected to truss nodes (2) to form a continuous structure in the direction of the bridge; a plurality of cross beams are arranged at intervals between the chords (1), the cross beams comprising upper wing plates (6), lower wing plates (7) and cross beam web stiffening ribs (9); A crossbeam web (8) is installed between the crossbeam upper wing plate (6) and the crossbeam lower wing plate (7), and the crossbeam web (8) and the crossbeam web stiffening rib (9) are connected to each other; a bridge deck (3) is arranged above the crossbeam, and longitudinal stiffening ribs (4) and transverse connecting plates (5) are arranged below the bridge deck (3).

2. A new type of dense beam-plate-truss combined bridge deck system according to claim 1, characterized in that: The chord (1) is arranged flush with the truss node (2), no cross beam is arranged at the truss node (2), and the cross beams are arranged at equal intervals along the bridge direction.

3. The novel dense beam-plate-truss combined bridge deck system according to claim 1 is characterized in that: The upper wing plate (6) before the cross beam is not connected to the bridge deck (3) is used as a component of the cross beam cross section to form an I-shaped cross section to resist the deadweight of the cross beam.

4. The novel dense beam-plate-truss combined bridge deck system according to claim 1 is characterized in that: After the cross beam is connected to the bridge deck (3), the upper wing plate (6) serves as a horizontal stiffening rib of the bridge deck cross beam to enhance the stability of the cross beam web.

5. The novel dense beam-plate-truss combined bridge deck system according to claim 1 is characterized in that: The crossbeam web stiffening ribs (9) are installed at intervals on the crossbeam web (8), and the heights of the two sides of the crossbeam are lower than the height of the central crossbeam.

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