Orthotropic bridge deck based on PBL shear connectors
By using cross-sectional PBL shear connectors and triangular top plate connectors between the bridge deck and the concrete pavement layer, the problems of connection fatigue damage and weak resistance to vertical separation in the existing technology have been solved, thereby improving the stability and service life of the bridge structure.
Patent Information
- Application Number
- CN202520070973.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Existing connection methods between bridge decks and concrete pavement layers suffer from problems such as fatigue damage, complex construction, high cost, and weak resistance to vertical separation. In particular, the connection performance between bridge decks and concrete pavement layers is insufficient in the application of PBL shear connectors, resulting in damage to the overall function of the bridge.
PBL shear connectors are used, and first and second shear connectors are formed by processing and assembling steel plates to form cross-shaped shear connectors. They are then welded to longitudinal and transverse reinforcing bars and combined with triangular top plate connectors to form an integral structure, which improves connection strength and resistance to stress concentration.
It enhances the connection performance between the bridge deck and the concrete pavement, extends service life, reduces maintenance costs, improves resistance to vertical separation and overall stability, and is suitable for various steel-concrete structure connections.
Smart Images
Figure CN223675143U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of bridge engineering, and particularly relates to an orthotropic bridge deck slab based on a PBL shear connector. BACKGROUND
[0002] In modern bridge design and construction, the connection between the steel bridge deck slab and the concrete pavement layer is crucial. The performance of the bridge pavement layer directly affects the durability, driving comfort, and safety of the bridge. In the design of the bridge pavement layer, UHPC is widely used as a new high-performance material due to its crack resistance, durability, and high strength characteristics. However, insufficient connection performance between the UHPC pavement layer and the bridge deck slab may lead to interface layer peeling, slippage, or damage, thereby endangering the overall function of the bridge.
[0003] To ensure that the steel bridge deck slab and the concrete pavement layer work together under load, shear connectors are usually used to connect them. In the prior art, the connection between the bridge deck slab and the concrete pavement layer mainly includes stud connection, welding connection, prestressed cable connection, and composite material connection. These shear connectors not only play a role in transmitting shear force, but also ensure the integrity, stability, and service life of the structure. However, as the service life of the bridge increases and the traffic load continues to increase, the existing shear connector solutions have exposed some significant problems in practical application, which need to be improved.
[0004] Stud connector: stud connection is the most commonly used shear connection method at present, which usually transmits shear force by welding studs between the steel bridge deck slab and the concrete pavement layer. The advantage of stud connection is that it is relatively simple to construct and can effectively connect the bridge deck slab and the pavement layer. However, stud connection also has some disadvantages, mainly due to the fact that studs are prone to fatigue damage under load, especially on bridges with frequent traffic, the fatigue life of studs is relatively short.
[0005] Prestressed cable connector: some new technical solutions propose the use of prestressed cables or other materials as shear connectors, which can apply prestress between the bridge deck slab and the concrete pavement layer, thereby improving the bearing capacity and anti-deformation ability of the connection. Prestressed connectors have been applied in some high-load bridges, but their construction process is complex, the cost is high, and they may have problems such as prestress relaxation in long-term use, affecting their effectiveness.
[0006] PBL connector: PBL (Precast Beam-Linked) shear connector is a new type of connection technology, which can effectively improve the shear transfer performance and durability and reduce the slip phenomenon by designing the precast beam and the concrete pavement layer into a specific connection form. PBL shear connector not only shows excellent shear resistance, stiffness and fatigue performance, but also is easy to install on the construction site, saving construction time and cost. However, the application of orthotropic bridge deck based on PBL shear connector still faces some challenges, such as the pullout action between the concrete pavement layer and the bridge deck, the vertical separation resistance of the orthotropic bridge deck based on PBL shear connector is weaker than that of the stud connector, and stress concentration is easy to occur under temperature change or load, resulting in the decrease of mechanical properties. Practical new type content
[0007] In view of the problems existing in the prior art, the present new type discloses an orthotropic bridge deck based on PBL shear connector, which is mainly composed of steel plates, and is simple to process and convenient to construct, can effectively strengthen the connection performance between the concrete pavement layer and the steel bridge deck, improve the service life of the bridge deck, and reduce the maintenance cost in the later period.
[0008] In order to achieve the above purpose, the technical scheme of the present new type is as follows:
[0009] An orthotropic bridge deck based on PBL shear connector, comprising a PBL shear connector body and a reinforced concrete slab integrally poured with the PBL shear connector body, wherein the PBL shear connector body comprises a steel plate, a plurality of stiffening ribs are welded on the bottom of the steel plate along the longitudinal direction, a plurality of first shear connectors are welded on the top of the steel plate along the transverse direction and a plurality of second shear connectors are welded on the top of the steel plate along the longitudinal direction, the first shear connectors and the second shear connectors are transversely and longitudinally crossed and a top plate connector is welded at the crossing, the reinforced concrete slab comprises longitudinal reinforcing steel bars, transverse reinforcing steel bars and a concrete slab, the longitudinal reinforcing steel bars and the transverse reinforcing steel bars are transversely and longitudinally crossed and welded with each other, the first shear connectors and the second shear connectors are respectively provided with a matching structure one connected with the longitudinal reinforcing steel bars and a matching structure two connected with the transverse reinforcing steel bars, and the concrete slab is integrally poured with the PBL shear connector body, the longitudinal reinforcing steel bars and the transverse reinforcing steel bars.
[0010] Preferably, the stiffening ribs are one or a combination of U ribs, I ribs, inverted T ribs or spherical flat steel structures.
[0011] Preferably, the first shear connector is a steel plate structure with a "X" shaped cross section, the two top ends and the two bottom ends of the steel plate structure are respectively outwardly folded along the horizontal direction to form support plate structures, and a plurality of matching structures one are distributed at equal intervals on the front surface of the first shear connector.
[0012] Preferably, the first shear connector comprises a strip-shaped slot formed vertically downward from the top of the first shear connector and a circular slot formed at the bottom of the strip-shaped slot, the strip-shaped slot and the circular slot being in communication with each other, the inner diameter of the circular slot being larger than the width of the strip-shaped slot, and the width of the strip-shaped slot being larger than the diameter of the longitudinal reinforcing steel bar.
[0013] Preferably, the second shear connector is composed of a rectangular steel plate structure, the second shear connector comprises a plurality of perforations formed at the bottom of the rectangular steel plate structure at equal intervals along the length direction, the perforations being used to pass through the transverse reinforcing steel bar, and the upper part of the rectangular steel plate structure and the upper and lower parts of the perforations being further provided with through holes, the inner diameter of the through holes being larger than the inner diameter of the perforations, and the inner diameter of the perforations being matched with the outer diameter of the transverse reinforcing steel bar.
[0014] Preferably, the structure at the intersection of the first shear connector and the second shear connector is that the second shear connector is disconnected at the intersection, and the first shear connector is continuously through.
[0015] Preferably, the roof connector is a triangular steel plate structure, the triangular steel plate structure is respectively welded to the top of the first shear connector on one side of the second shear connector, and the roof connectors on both sides of the second shear connector are symmetrically arranged.
[0016] Preferably, the triangular steel plate structure is an isosceles triangle structure, the top angle of the isosceles triangle structure is an obtuse angle, the bottom side is welded to the side surface of the second shear connector, and the lower surface of the triangular steel plate structure is welded to the top of the first shear connector.
[0017] Preferably, the longitudinal reinforcing steel bars are arranged along the longitudinal direction, the transverse reinforcing steel bars are arranged along the transverse direction, the spacing between adjacent perforations is the same as the spacing between adjacent transverse reinforcing steel bars, and the spacing between adjacent strip-shaped slots is the same as the spacing between adjacent longitudinal reinforcing steel bars.
[0018] Preferably, the material of the concrete slab is ordinary concrete, ECC or UHPC.
[0019] The new type of orthotropic bridge deck slab based on PBL shear connector has the following advantages:
[0020] 1. The utility model discloses a simple structure, easy to make and process. The utility model discloses a shear connector mainly comprises first shear connector, second shear connector and the horizontal X-shaped shear connector with half closed slot, and the top plate connector, that is, the triangular horizontal top plate. The two intersecting steel plates of the X-shaped shear connector form a certain angle with the top of the steel plate, so that the inclined wing of the horizontal X-shaped shear connector shares the horizontal shear force, avoids stress concentration at the bottom welding position, causes the shear connector to damage and fail prematurely, thereby effectively prolonging the service life of the bridge deck, and reducing the maintenance cost in the later period.
[0021] 2. The utility model discloses a vertical intersection of the first shear connector and the second shear connector, the bottom (the longest side) of the triangular horizontal top plate is connected on the two sides of the first shear connector, that is, the longitudinal perforated plate shear connector, and the bottom surface is welded with the top surface of the second shear connector, which can make the triangular horizontal top plate and the concrete at the bottom interlock, thereby effectively improving the vertical separation resistance of the concrete plate.
[0022] 3. The utility model discloses a wide application range, simple and stable shear connector, high reliability, can be applied to most steel-concrete structure connecting parts. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical scheme of the utility model, the drawings needed in the embodiment are briefly introduced below, and constitute a part of the specification, together with the embodiment of the utility model, for explaining the utility model, and do not constitute the limitation to the utility model.
[0024] Figure 1 It is the axial section view schematic diagram of the bridge deck embodiment of the utility model.
[0025] Figure 2 It is the cross section schematic diagram of the embodiment shown in the figure. Figure 1
[0026] Figure 3 It is the longitudinal section schematic diagram of the embodiment shown in the figure. Figure 1
[0027] Figure 4 It is the front view structure schematic diagram of the second shear connector embodiment of the utility model.
[0028] Figure 5 It is the front view structure schematic diagram of the first shear connector embodiment of the utility model.
[0029] Figure 6 It is the side section structure schematic diagram of the first shear connector embodiment of the utility model.
[0030] Figure 7 It is the structure schematic diagram of the top plate connector of the utility model.
[0031] 1-Second shear connector; 11-Perforation; 12-Through hole; 2-Top plate connector; 3-Steel plate; 4-Stiffening rib; 5-Longitudinal reinforcing bar; 6-Transverse reinforcing bar; 7-First shear connector; 71-Support plate structure; 72-Strip groove; 73-Circular groove; 8-Concrete slab. Detailed Implementation
[0032] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0033] The following embodiments can be understood as explaining a partial structure of the present invention individually, or as explaining a larger structure of the present invention through a combination of multiple embodiments.
[0034] In the initial embodiment, the present invention provides an orthotropic bridge deck based on PBL shear connectors, such as... Figures 1-7 As shown, the structure includes a PBL shear connector body and a reinforced concrete slab cast integrally with it. The PBL shear connector body includes a steel plate 3. Several stiffening ribs 4 are welded longitudinally to the bottom of the steel plate 3. Several first shear connectors 7 are welded transversely to the top of the steel plate 3, and several second shear connectors 1 are welded longitudinally. The first shear connectors 7 and second shear connectors 1 intersect horizontally and vertically, and a top plate connector is welded at the intersection. The reinforced concrete slab includes longitudinal reinforcing bars 5, transverse reinforcing bars 6, and a concrete slab 8. The longitudinal reinforcing bars 5 and transverse reinforcing bars 6 intersect horizontally and vertically and are welded to each other. The first shear connectors 7 and second shear connectors 1 are respectively provided with a matching structure 1 for connecting with the longitudinal reinforcing bars 5 and a matching structure 2 for connecting with the transverse reinforcing bars 6. The concrete slab 8 is cast integrally with the PBL shear connector body, the longitudinal reinforcing bars 5, and the transverse reinforcing bars 6 using concrete material.
[0035] In a further embodiment, such as Figure 1 As shown, the stiffening rib 4 is composed of one or more of the following: a U-rib, an I-rib, an inverted T-rib, or a bulbous flat steel structure. The welding form of the U-rib is as follows: Figure 1 As shown, the two top ends of the U-rib are welded to the bottom of the steel plate, the I-rib is a steel plate rib with an "I"-shaped cross section, and its top is welded to the bottom of the steel plate 3; the T-rib is a steel plate with an inverted "T"-shaped cross section, and its top is welded to the bottom of the steel plate 3; the spherical flat steel structure is welded to the bottom of the steel plate 3 through the bottom plane.
[0036] Further embodiments, as shown in Figure 1 , 2 , 3, 5, 6, the first shear connector 7 is a steel plate structure with a "X" shaped cross section, the two top ends and two bottom ends of the steel plate structure are respectively folded outward along the horizontal direction to form a support plate structure 71, and the front surface of the first shear connector 7 is distributed with a plurality of matching structures one at equal intervals.
[0037] Further embodiments, as shown in Figure 1 , 2 , 3, 5, 6, the matching structure one includes a strip-shaped groove 72 opened vertically downward from the top of the first shear connector 7 and a circular groove 73 opened at the bottom of the strip-shaped groove 72, the strip-shaped groove 72 and the circular groove 73 are in communication with each other, the inner diameter of the circular groove 73 is greater than the width of the strip-shaped groove 72, and the width of the strip-shaped groove 72 is greater than the diameter of the longitudinal reinforcing steel bar 5.
[0038] Further embodiments, as shown in Figure 1 , 2 , 3, 4, the second shear connector 1 is composed of a rectangular steel plate structure, the matching structure two includes a plurality of perforations 11 opened at equal intervals on the bottom of the rectangular steel plate structure along the length direction, the perforations 11 are used to pass through the transverse reinforcing steel bar 6, and the upper part of the rectangular steel plate structure and the upper and lower parts of the perforations 11 are also provided with through holes 12, the inner diameter of the through hole 12 is greater than the inner diameter of the perforation 11, and the inner diameter of the perforation 11 is matched with the outer diameter of the transverse reinforcing steel bar 6. As shown in Figure 1 , the position of the transverse reinforcing steel bar 6 is fixed by the perforation 11, on this basis, the longitudinal reinforcing steel bar 5 is constrained in the corresponding position in the strip-shaped groove 72 or the circular groove 73, and the gap of the through hole 12, the strip-shaped groove 72 and the circular groove 73 is used to pass through the concrete, thereby strengthening the integrity of the structure.
[0039] Further embodiments, as shown in Figure 1 , 2 , 3, the intersection structure of the first shear connector 7 and the second shear connector 1 is that at the intersection, the second shear connector 1 is disconnected, and the first shear connector 7 is continuously penetrated. Among them, the interval of the first shear connector and the second shear connector arranged respectively is determined according to the actual construction situation according to the relevant design method of composite beam.
[0040] Further embodiments, as shown in Figure 1 , 2The top plate connecting piece 2 is a triangular steel plate structure, and the triangular steel plate structure is welded to the top of the first shear connecting piece 7 on one side of the second shear connecting piece 1. The top plate connecting pieces 2 on both sides of the second shear connecting piece 1 are symmetrically arranged. The top plate connecting piece can constrain the concrete, effectively improving the vertical anti-separation capacity of the bridge deck slab.
[0041] In further embodiments, as shown in Figure 1 , 2 , 3, 7, the triangular steel plate structure is an isosceles triangle structure, the top angle of the isosceles triangle structure is an obtuse angle, the bottom side is welded to the side of the second shear connecting piece 1, and the lower surface of the triangular steel plate structure is welded to the top of the first shear connecting piece 7.
[0042] In further embodiments, as shown in Figure 1 , the longitudinal reinforcing steel bars 5 are arranged along the longitudinal direction, the transverse reinforcing steel bars 6 are arranged along the transverse direction, the spacing between adjacent perforations 11 is the same as the spacing between adjacent transverse reinforcing steel bars 6, and the spacing between adjacent strip-shaped grooves 72 is the same as the spacing between adjacent longitudinal reinforcing steel bars 5.
[0043] In further embodiments, as shown in Figure 1 , the material of the concrete slab 8 is ordinary concrete or ECC or UHPC.
Claims
1. A PBL shear connector based orthotropic bridge deck panel characterized by: The utility model provides a PBL shear connector body and reinforced concrete slab which are integrally casted, the PBL shear connector body comprises a steel plate, a plurality of stiffening ribs are welded on the bottom of the steel plate along the longitudinal direction, a plurality of first shear connectors are welded on the top of the steel plate along the transverse direction and a plurality of second shear connectors are welded on the steel plate along the longitudinal direction, the first shear connectors and the second shear connectors are transversely and longitudinally crossed and a top plate connector is welded at the crossing, the reinforced concrete slab comprises longitudinal reinforcing steel bars, transverse reinforcing steel bars and a concrete slab, the longitudinal reinforcing steel bars and the transverse reinforcing steel bars are transversely and longitudinally crossed and welded, the first shear connectors and the second shear connectors are respectively provided with a first matching structure connected with the longitudinal reinforcing steel bars and a second matching structure connected with the transverse reinforcing steel bars, and the concrete slab is integrally casted with the PBL shear connector body, the longitudinal reinforcing steel bars and the transverse reinforcing steel bars.
2. A PBL shear connector based orthotropic bridge deck slab as claimed in claim 1, characterized in that: The stiffening ribs are U ribs, I ribs, inverted T ribs or one or several combinations of ball flat steel structures.
3. A PBL shear connector based orthotropic bridge deck panel as claimed in claim 2, characterized in that: The first shear connector is a steel plate structure with an ''X'' shaped cross section, two top ends and two bottom ends of the steel plate structure are respectively outwardly folded along the horizontal direction to form support plate structures, and a plurality of first matching structures are equidistantly distributed on the front surface of the first shear connector.
4. A PBL shear connector based orthotropic bridge deck panel as claimed in claim 3, characterized in that: The first matching structure comprises a strip-shaped groove opened downward from the top of the first shear connector and a circular groove opened at the bottom of the strip-shaped groove, the strip-shaped groove and the circular groove are communicated with each other, the inner diameter of the circular groove is larger than the width of the strip-shaped groove, and the width of the strip-shaped groove is larger than the diameter of the longitudinal reinforcing steel bars.
5. A PBL shear connector based orthotropic bridge deck panel as claimed in claim 4, characterized in that: The second shear connector is composed of a rectangular steel plate structure, the second matching structure comprises a plurality of perforations equidistantly opened at the bottom of the rectangular steel plate structure along the length direction, the perforations are used to pass through the transverse reinforcing steel bars, and a through hole is further opened at the upper surface of the rectangular steel plate structure opposite to the perforations, the inner diameter of the through hole is larger than the inner diameter of the perforations, and the inner diameter of the perforations is matched with the outer diameter of the transverse reinforcing steel bars.
6. A PBL shear connector based orthotropic bridge deck panel as claimed in claim 5, characterized by: The structure at the crossing of the first shear connector and the second shear connector is that the second shear connector is disconnected at the crossing and the first shear connector is continuously penetrated.
7. A PBL shear connector based orthotropic bridge deck panel as claimed in claim 6, characterized by: The top plate connector is a triangular steel plate structure, the triangular steel plate structure is respectively welded on the top of the first shear connector on one side of the second shear connector, and the top plate connectors on both sides of the second shear connector are symmetrically arranged.
8. A PBL shear connector based orthotropic bridge deck panel as claimed in claim 7, characterized by: The triangular steel plate structure is an isosceles triangular structure, the top angle of the isosceles triangular structure is an obtuse angle, the bottom side is welded with the side surface of the second shear connector, and the lower surface of the triangular steel plate structure is welded with the top of the first shear connector.
9. A PBL shear connector based orthotropic bridge deck panel as claimed in claim 8, characterized by: The longitudinal reinforcing steel bars are arranged along the longitudinal direction, the transverse reinforcing steel bars are arranged along the transverse direction, the interval of the adjacent perforations is the same as the interval of the adjacent transverse reinforcing steel bars, and the interval of the adjacent strip-shaped grooves is the same as the interval of the adjacent longitudinal reinforcing steel bars.
10. A PBL shear connector based orthotropic bridge deck panel as claimed in claim 9, characterized by: The material of the concrete slab is ordinary concrete, ECC or UHPC.