Reinforcing structure of continuous end of bridge deck hollow slab beam and reinforcing method thereof
By using steel mesh and I-beams to reinforce the continuous ends of the concrete hollow slab beam bridge, the problem of insufficient shear bearing capacity was solved, the structural stability and service life of the bridge were improved, and the high-cost demolition and reconstruction were avoided.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 河北交规院瑞志交通技术咨询有限公司
- Filing Date
- 2026-04-29
- Publication Date
- 2026-05-29
AI Technical Summary
Early-built hollow concrete slab bridges, due to their low design load rating and insufficient safety reserves during construction, are prone to insufficient shear bearing capacity in the webs at the beam ends of their continuous cast-in-place sections, leading to shear cracking, which affects the use and safety of the bridge. Furthermore, demolition and reconstruction are costly and disrupt traffic.
The structure is reinforced by first reinforcing bars, I-beams, steel mesh and UHPC layer. Multiple hollow slab beams are connected by steel mesh. The combination of I-beams and UHPC layer enhances the shear bearing capacity, forming a composite reinforcement structure. The steel mesh is used to distribute the load and reduce local stress concentration.
It significantly enhances the shear bearing capacity of the continuous ends of the hollow slab beam, extends the service life of the bridge, reduces the frequency and cost of maintenance, avoids the high cost of demolition and reconstruction, and improves the stability and crack resistance of the structure.
Smart Images
Figure CN122105994A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of bridge maintenance technology, and in particular to a reinforcement structure and reinforcement method for the continuous end of an existing hollow slab beam on a bridge deck. Background Technology
[0002] Hollow concrete slab beams are widely used in bridge construction due to their advantages such as light weight, low cost, mature manufacturing technology, and convenient installation. With the advent of the "post-construction market," bridge reinforcement and maintenance have gradually become a focus of attention, ushering in significant development opportunities. However, some early-built hollow concrete slab bridges, due to factors such as lower design load ratings and insufficient safety reserves during construction, can no longer meet the growing transportation demands, making the reinforcement of older bridges a crucial aspect of bridge maintenance.
[0003] Specifically, the span of a concrete hollow slab girder bridge is generally 8 to 16 meters, belonging to the category of small to medium-span bridge structures. Due to its thin web and insufficient shear capacity, coupled with the continuous increase in traffic flow, many existing bridges' concrete hollow slab girders are prone to shear cracking at the beam end webs of the continuously cast-in-place sections due to insufficient shear bearing capacity. This not only seriously affects the normal use of the bridge but may also pose a hidden danger to traffic safety.
[0004] In practical engineering, the maintenance and reinforcement of these bridges present significant challenges. Demolition and reconstruction are not only prohibitively expensive but also severely disrupt traffic. Therefore, there is an urgent need to develop new, cost-effective reinforcement technologies to improve the shear capacity of concrete hollow slab girder bridges, thereby extending their service life and ensuring traffic safety. Summary of the Invention
[0005] The purpose of this invention is to provide a reinforcement structure and method for the continuous end of existing hollow slab beams on bridge decks. The structure is simple and can effectively strengthen the shear bearing capacity of the connection end of the hollow slab beam, thereby improving the structural stability of the continuous end of the hollow slab beam on bridge decks.
[0006] To achieve this objective, the present invention adopts the following technical solution: Firstly, a reinforcement structure is provided for the continuous ends of existing hollow slab beams on bridge decks. This structure is used to reinforce the continuous ends of two sets of hollow beams arranged longitudinally along the bridge. Each set of hollow beams includes multiple hollow slab beams arranged transversely along the bridge, comprising a first reinforcing bar, I-beams, a reinforcing mesh, and a reinforcement layer. The first reinforcing bar is embedded in each hollow slab beam, with a portion of the first reinforcing bar protruding from the hollow slab beam. Multiple I-beams are spaced apart along the longitudinal direction of the bridge in each set of hollow beams. The length of the I-beams extends transversely along the bridge, and on each hollow slab beam… At least two first reinforcing bars are provided between two adjacent I-beams; at least two layers of steel mesh are provided vertically spaced on the first reinforcing bars protruding from the hollow slab beam, all the first reinforcing bars are connected to the steel mesh, and the steel mesh covers the continuous ends of the two sets of hollow beams, wherein the vertical direction, the longitudinal direction of the bridge, and the transverse direction of the bridge are perpendicular to each other; the reinforcement layer includes a UHPC layer and an asphalt layer, the UHPC layer covers the first reinforcing bars, the I-beams, and all the steel mesh, and the asphalt layer is provided on the UHPC layer.
[0007] In one embodiment, at least two sets of connecting holes are provided on the web of the I-beam along the longitudinal direction of the bridge. The two sets of connecting holes are spaced apart along the vertical direction. Each set of connecting holes includes a plurality of connecting holes spaced apart along the transverse direction of the bridge. The steel mesh has a plurality of second steel bars spaced apart along the transverse direction of the bridge. The second steel bars pass through the connecting holes.
[0008] In one embodiment, the spacing between two adjacent second reinforcing bars along the transverse direction of the bridge is D1, and the spacing between two adjacent I-beams along the longitudinal direction of the bridge is D2, where D2 = 2D1.
[0009] In one embodiment, the first reinforcing bar includes a vertically arranged support portion and a first connecting portion. The support portion is partially embedded within the hollow slab beam, and its length extends vertically. The first connecting portion is located at the end of the support portion away from the hollow slab beam, and its length extends laterally along the bridge. A reinforcing mesh disposed away from the hollow slab beam is connected to the first connecting portion; or... The first reinforcing bar includes a support portion, a first connecting portion, and a second connecting portion. The support portion is partially embedded in the hollow slab beam. The length of the support portion extends vertically. The first connecting portion and the second connecting portion are spaced apart along the vertical direction on the support portion. The lengths of the first connecting portion and the second connecting portion both extend horizontally along the bridge. The reinforcing mesh is provided in two layers, and the first connecting portion and the second connecting portion are each connected to one layer of the reinforcing mesh.
[0010] In one embodiment, the diameter of the support is D3, where D3 ≥ 12 mm, and the depth to which the support is embedded in the hollow slab beam is H1, where H1 ≥ 10D3.
[0011] In one embodiment, the hollow slab beam is recessed with a plurality of receiving grooves, and the UHPC layer extends into the receiving grooves.
[0012] In one embodiment, the reinforcement structure of the continuous end of the existing bridge deck hollow slab beam further includes ribbed steel bars, the two ends of which are respectively embedded in the UHPC layer and the asphalt layer.
[0013] In one embodiment, the material composition of the UHPC layer is as follows: 700-850 parts of 52.5 grade silicate cement, 200-300 parts of silica fume, 1000-1200 parts of quartz sand, 150-250 parts of steel fiber, 30-50 parts of water-reducing agent, and 180-210 parts of water.
[0014] Secondly, a method for reinforcing the continuous end of an existing hollow slab beam on a bridge deck is provided, for forming a reinforcement structure for the continuous end of the existing hollow slab beam on a bridge deck, the specific steps of which include: S10. Taking the center line of the continuous end between the two groups of hollow bridges arranged longitudinally along the bridge as the center, at least 3 meters of the existing bridge deck is removed along the longitudinal direction of the bridge to expose the continuous end of the hollow slab beam. S20. Multiple positioning grooves are made on the hollow slab beam, and asphalt, cement concrete pavement, oil stains and laitance are removed from the surface of the hollow slab beam. The first reinforcing bar is inserted into the positioning groove. S30. Multiple I-beams are placed at intervals along the longitudinal direction of the bridge on the hollow slab beam, and then a steel mesh is laid to connect the steel mesh with the first steel bar. At least two layers of the steel mesh are laid on the first steel bar. S40. Pour UHPC material to cover the first reinforcing bar, the reinforcing mesh and the I-beam to form a UHPC layer, and then lay an asphalt layer on the UHPC layer.
[0015] In one embodiment, in step S30, a connecting hole is provided through the I-beam along the longitudinal direction of the bridge. When the steel mesh is laid, a second steel bar extending along the longitudinal direction of the bridge in the steel mesh passes through the connecting hole, so that the second steel bar is welded or tied to the I-beam.
[0016] The beneficial effects of this invention are: This invention discloses a reinforcement structure for the continuous end of an existing hollow slab beam on a bridge deck. It utilizes a first reinforcing bar to strengthen the connection with the hollow slab beam, and then uses a multi-layered steel mesh to connect all the first reinforcing bars on multiple hollow slabs. This ensures the integrity of the connection between all the first reinforcing bars and all the hollow slab beams, effectively strengthening the connection strength between the reinforcement layer, the steel mesh, the first reinforcing bars, and the hollow slab beams after the reinforcement layer is laid. This significantly enhances the shear bearing capacity of the continuous end of the hollow slab beam. The steel mesh and the first reinforcing bars effectively disperse the load, reducing local stress concentration and thus lowering the risk of shear cracking. By laying multiple I-beams extending laterally along the bridge, the structural strength and lateral shear force of the reinforcement structure at the continuous end of the existing hollow slab beam on the bridge deck are effectively strengthened, significantly extending the service life of the existing hollow slab beam, reducing the frequency and cost of maintenance due to bridge structural aging, and avoiding the high costs of demolition and reconstruction, thus possessing good economic benefits. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the reinforcement structure at the continuous end of the existing hollow slab beam of the bridge deck in one embodiment. Figure 1 ; Figure 2 yes Figure 1 An enlarged view of point A; Figure 3 This is a schematic diagram of the reinforcement structure at the continuous end of the existing hollow slab beam of the bridge deck in one embodiment. Figure 2 ; Figure 4 yes Figure 3 An enlarged view of point B; Figure 5 This is a flowchart illustrating a method for reinforcing the continuous end of an existing hollow slab beam on a bridge deck, as described in one embodiment.
[0018] In the picture: 100, continuous end; 200, hollow slab beam; 1. First reinforcing bar; 11. Support part; 12. First connecting part; 2. I-beam; 3. Reinforcing mesh; 31. Second reinforcing bar; 4. Reinforcing layer; 41. UHPC layer; 42. Asphalt layer. Detailed Implementation
[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0022] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.
[0023] like Figures 1 to 5As shown in this embodiment, a reinforcement structure for the continuous end of an existing hollow slab beam of a bridge deck (hereinafter referred to as the reinforcement structure) is used to reinforce the continuous end 100 of two sets of hollow beams arranged longitudinally along the bridge. Each set of hollow beams includes multiple hollow slab beams 200 arranged transversely along the bridge, including a first reinforcing bar 1, an I-beam 2, a reinforcing mesh 3, and a reinforcement layer 4. Each hollow slab beam 200 is embedded with a first reinforcing bar 1, and the first reinforcing bar 1 protrudes from the hollow slab beam 200. Multiple I-beams 2 are spaced apart along the longitudinal direction of the bridge in each set of hollow beams, and the length of the I-beams 2 extends transversely along the bridge. The hollow slab beam 200 extends, and at least two first reinforcing bars 1 are provided between two adjacent I-beams 2; at least two layers of steel mesh 3 are provided vertically spaced on the first reinforcing bars 1 protruding from the hollow slab beam 200, and all the first reinforcing bars 1 are connected to the steel mesh 3. The steel mesh 3 covers the continuous ends 100 of the two sets of hollow beams, wherein the vertical direction, the longitudinal direction of the bridge and the transverse direction of the bridge are perpendicular to each other; the reinforcement layer 4 includes a UHPC layer 41 and an asphalt layer 42. The UHPC layer 41 covers the first reinforcing bars 1, the I-beams 2 and all the steel mesh 3, and the asphalt layer 42 is provided on the UHPC layer 41.
[0024] It is understood that the reinforcement structure of the continuous end of the existing hollow slab beam of the present invention uses the first steel bar 1 to strengthen the connection with the hollow slab beam 200, and then uses multiple layers of steel mesh 3 to connect all the first steel bars 1 on multiple hollow slabs to ensure the integrity of the connection of all the first steel bars 1 and all the hollow slab beams 200 on the two sets of hollow beams. Thus, after the reinforcement layer 4 is laid, the connection strength of the reinforcement layer 4, the steel mesh 3 and the first steel bars 1 and the hollow slab beam 200 is effectively strengthened, significantly enhancing the shear bearing capacity of the continuous end 100 of the hollow slab beam 200. The steel mesh 3 and the first steel bars 1 effectively disperse the load and reduce the local stress concentration, thereby reducing the risk of shear cracking. By laying multiple I-beams 2 extending laterally along the bridge, the structural strength and lateral shear force of the reinforcement structure at the continuous end of the existing hollow slab beam of the bridge deck are effectively enhanced. The I-beams 2 have good bending resistance and can effectively resist bending moment, significantly extending the service life of the existing hollow slab beam 200 of the bridge deck, reducing the maintenance frequency and cost caused by the aging of the bridge structure, and avoiding the high cost of demolition and reconstruction, thus having good economic benefits.
[0025] Furthermore, such as Figure 3 and Figure 4As shown, at least two sets of connecting holes are provided longitudinally along the bridge on the web of the I-beam 2. These two sets of connecting holes are spaced apart vertically, and each set includes multiple connecting holes spaced apart transversely along the bridge. The reinforcing mesh 3 has multiple second reinforcing bars 31 spaced apart transversely along the bridge, which pass through the connecting holes. By providing connecting holes on the I-beam 2 and allowing the second reinforcing bars 31 of the reinforcing mesh 3 to pass through these connecting holes, a good connection is formed with the I-beam 2, enhancing the tight bond between the reinforcing mesh 3 and the I-beam 2. This improves the shear resistance and stability of the reinforced structure, ensuring the overall structural strength of the hollow slab beam 200, the first reinforcing bar 1, the reinforcing mesh 3, the I-beam 2, and the reinforcement layer 4. This forms a more robust composite reinforcement structure, not only improving the shear bearing capacity of the hollow slab beam 200 but also enhancing the crack resistance of the reinforced structure, especially under high loads or impact loads, better resisting external forces. Of course, by setting the connecting holes, the installation accuracy of the second steel bar 31 of the steel mesh 3 can be effectively improved, the second steel bar 31 can be quickly passed through the holes and fixed, and then the steel mesh 3 can be laid, which effectively reduces the construction difficulty and time and improves the construction efficiency.
[0026] Optionally, the spacing between two adjacent second reinforcing bars 31 along the transverse direction of the bridge is D1, and the spacing between two adjacent I-beams 2 along the longitudinal direction of the bridge is D2, where D2 = 2D1. This spacing arrangement is reasonable, ensuring a stable connection between the second reinforcing bars 31 and the I-beams 2 while appropriately increasing the spacing between two adjacent I-beams 2. This reduces the number of I-beams 2 without affecting the load-bearing capacity of the reinforced structure, and avoids uneven stress transmission in the reinforced structure due to excessive rigidity caused by an excessive number of I-beams 2.
[0027] Preferably, such as Figure 2 As shown, the first reinforcing bar 1 includes a vertically arranged support portion 11 and a first connecting portion 12. The support portion 11 is partially embedded within the hollow slab beam 200, and its length extends vertically. The first connecting portion 12 is located at the end of the support portion 11 furthest from the hollow slab beam 200, and its length extends laterally along the bridge. The reinforcing mesh 3, located furthest from the hollow slab beam 200, connects to the first connecting portion 12. This arrangement ensures the connection between the first reinforcing bar 1 and the hollow slab beam 200 using the support portion 11, and also improves the convenience and stability of the connection between the first reinforcing bar 1 and the upper reinforcing mesh 3 using the first connecting portion 12, preventing separation between the upper reinforcing mesh 3 and the first reinforcing bar 1. Furthermore, the first connecting portion 12's lateral extension along the bridge increases lateral stability, ensuring that the hollow slab beam 200 can evenly distribute pressure when bearing lateral loads, avoiding localized stress concentration. The support portion 11 bears the vertical load, reducing bending deformation, while the first connecting portion 12, through its lateral extension and cooperation with the reinforcing mesh 3, helps to better resist shear forces.
[0028] Furthermore, the first reinforcing bar 1 includes a support portion 11, a first connecting portion 12, and a second connecting portion. The support portion 11 is partially embedded within the hollow slab beam 200, and its length extends vertically. The first connecting portion 12 and the second connecting portion are spaced vertically on the support portion 11, and their lengths both extend laterally along the bridge. The reinforcing mesh 3 has two layers, with each layer of reinforcing mesh 3 connected to the first connecting portion 12 and the second connecting portion. This arrangement ensures the connection between the first reinforcing bar 1 and the hollow slab beam 200 using the support portion 11, which bears the vertical load and reduces bending deformation. It also improves the convenience and stability of the connection between the first reinforcing bar 1 and the reinforcing mesh 3 by utilizing the connection between the first connecting portion 12 and the upper layer of reinforcing mesh 3, and the connection between the second connecting portion and the lower layer of reinforcing mesh 3. Of course, the first connection part 12 and the second connection part extend laterally along the bridge, which increases the lateral stability and ensures that the hollow slab beam 200 can distribute the pressure evenly when bearing lateral loads, avoiding local stress concentration. The first connection part 12 and the second connection part, through lateral extension and cooperation with the steel mesh 3, help to better resist shear force.
[0029] In some embodiments, the diameter of the support portion 11 is D3, where D3 ≥ 12 mm, and the depth to which the support portion 11 is embedded in the hollow slab beam 200 is H1, where H1 ≥ 10D3. For example, the diameter D3 of the support portion 11 can be 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc., to ensure the structural strength of the support portion 11. A larger diameter of the support portion 11 means a larger cross-section of the first reinforcing bar 1, which can withstand higher tensile and compressive forces, thereby enhancing the overall load-bearing capacity of the reinforced structure, reducing the risk of yielding and fracture of the support portion 11, and ensuring structural safety. By ensuring the embedding depth of the support part 11, sufficient friction and mechanical engagement are formed between the first reinforcing bar 1 and the hollow slab beam 200, ensuring a stable connection and effectively preventing the first reinforcing bar 1 from tilting, slipping, or being pulled out. This ensures that the load can be reliably transferred to the hollow slab beam 200 through the first reinforcing bar 1, guaranteeing the installation stability of the first reinforcing bar 1. Furthermore, the deeply embedded, thicker first reinforcing bar 1 can more effectively absorb the energy of sudden loads such as earthquakes or vehicle crushing, ensuring seismic performance.
[0030] Furthermore, multiple recessed grooves are provided on the hollow slab beam 200, and the UHPC layer 41 extends into these grooves. By providing multiple grooves on the hollow slab beam 200 and extending the UHPC layer 41 into these grooves, a composite interface of mechanical interlocking and adhesive bonding is formed. This creates a "bonding effect" between the UHPC layer 41 and the hollow slab beam 200, allowing them to work together under stress. This improves the interfacial bond strength between the UHPC layer 41 and the hollow slab beam 200, resulting in high connection strength and effectively enhancing the overall structural integrity and load-bearing capacity, avoiding situations where the UHPC layer 41 is only surface-attached. Simultaneously, this design effectively controls the generation and propagation of cracks, improving the beam's crack resistance. In addition, the embedding of the UHPC layer 41 into the grooves prevents interlayer delamination caused by long-term loads or environmental factors, improving durability.
[0031] Furthermore, the reinforcement structure at the continuous end of the existing hollow slab beam of the bridge deck also includes ribbed steel bars, with both ends of the ribbed steel bars embedded in the UHPC layer 41 and the asphalt layer 42, respectively. This arrangement improves the interfacial bond strength between the UHPC layer 41 and the asphalt layer 42, reduces the risk of material delamination, and enhances the crack resistance of the structure. Of course, the corrugated shape of the ribbed steel bars also enhances the mechanical interlocking force between the UHPC layer 41 and the asphalt layer 42, forming a strong anchoring effect, resulting in higher integrity and stability of the reinforced structure. Especially under long-term loads, this structure can effectively and evenly distribute stress, improving the load-bearing capacity and deformation resistance of the hollow slab beam 200 and the reinforced structure, particularly in the continuous end 100 region. Moreover, the ribbed steel bars have strong resistance to shear forces, especially in the continuous end 100 region, effectively resisting the shear forces and vibration effects caused by vehicle loads, maintaining higher stability, improving seismic resistance, and ensuring the safety of the hollow slab beam 200 of the bridge deck in complex environments.
[0032] Preferably, the material composition of the UHPC layer 41 is as follows: 700-850 parts of 52.5 grade silicate cement, 200-300 parts of silica fume, 1000-1200 parts of quartz sand, 150-250 parts of steel fiber, 30-50 parts of water-reducing agent, and 180-210 parts of water. Using 52.5 grade silicate cement (700-850 parts) provides high cement strength, improving the overall compressive strength of the UHPC. This high-strength, watertight ratio ensures that the concrete can effectively disperse and withstand large external forces under load, improving its shear capacity and crack resistance. Silica fume (200-300 parts) is a fine-particle mineral admixture that effectively fills voids in the cement paste, reduces porosity, improves the density of the concrete, helps improve its durability and impermeability, and further enhances its crack resistance. Under high shear force and deformation, silica fume can effectively inhibit the generation and propagation of cracks. Quartz sand (1000-1200 parts), as a fine aggregate, has high hardness and uniformity, which helps improve the compressive strength, shear capacity, and wear resistance of concrete, making it more resistant to external stress. Steel fibers (150-250 parts) can effectively control crack propagation, improve the toughness and ductility of concrete, and the uniform distribution of steel fibers allows the UHPC layer 41 to delay crack formation and effectively improve shear bearing capacity under external forces, significantly enhancing the toughness of the reinforced structure. Water-reducing agent (30-50 parts) can reduce the water-cement ratio, thereby improving the density and strength of concrete, ensuring that concrete still has good fluidity at a lower water-cement ratio, allowing the concrete to fully coat the aggregate and steel fibers, thereby improving its compressive strength, crack resistance, and impermeability.
[0033] like Figures 1 to 5 As shown, embodiments of the present invention also provide a method for reinforcing the continuous end 100 of an existing hollow slab beam 200 of a bridge deck. The specific steps of the provided reinforcement structure for the continuous end of the existing hollow slab beam include: forming the reinforcement structure for the continuous end of the existing hollow slab beam of any of the above embodiments, specifically including: S10. Taking the center line of the continuous end between the two sets of hollow bridge groups arranged in the longitudinal direction of the bridge as the center, at least 3 meters of the existing bridge deck is removed in the longitudinal direction of the bridge to expose the continuous end 100 of the hollow slab beam 200. S20. Multiple positioning slots are opened on the hollow slab beam 200, and asphalt, cement concrete pavement, oil stains and laitance are removed from the surface of the hollow slab beam 200. The first reinforcing bar 1 is inserted into the positioning slot. S30. Multiple I-beams 2 are placed at intervals along the longitudinal direction of the bridge on the hollow slab beam 200, and then steel mesh 3 is laid so that the steel mesh 3 is connected to the first steel bar 1. At least two layers of steel mesh 3 are laid on the first steel bar 1. S40. Pour UHPC material to cover the first steel bar 1, steel mesh 3 and I-beam 2 to form UHPC layer 41. Then lay asphalt layer 42 on UHPC layer 41. The thickness of UHPC layer 41 is H2 and the thickness of asphalt layer 42 is H3. H2=4H3.
[0034] This method is simple to operate. It involves creating positioning grooves to facilitate the laying of the first reinforcing bar 1, using the first reinforcing bar 1 to reinforce the connection with the hollow slab beam 200, and then using multi-layer steel mesh 3 to connect all the first reinforcing bars 1 on multiple hollow slabs to ensure the integrity of the connection between all the first reinforcing bars 1 and all the hollow slab beams 200. This effectively strengthens the connection strength between the steel mesh 3, the first reinforcing bars 1 and the hollow slab beam 200 after the UHPC layer 41 and the asphalt layer 42 are laid, significantly enhancing the shear bearing capacity of the continuous end 100 of the hollow slab beam 200. The steel mesh 3 and the first reinforcing bars 1 effectively disperse the load, reducing local stress concentration and thus lowering the risk of shear cracking. By laying multiple I-beams 2 extending laterally along the bridge, the structural strength and lateral shear force of the reinforcement structure at the continuous end of the existing hollow slab beam of the bridge deck are effectively enhanced. The second reinforcing bar 31 of the steel mesh 3 is connected through the connection hole to form a good connection with the I-beam 2, enhancing the tight bond between the steel mesh 3 and the I-beam 2. This improves the shear resistance and stability of the reinforcement structure, thus ensuring the overall structural strength of the hollow slab beam 200, the first reinforcing bar 1, the steel mesh 3, the I-beam 2, and the reinforcement layer 4, forming a more robust composite reinforcement structure. This can significantly extend the service life of the existing hollow slab beam 200 of the bridge deck, reduce the maintenance frequency and cost caused by the aging of the bridge structure, and avoid the high cost of demolition and reconstruction, thus achieving good economic benefits.
[0035] Furthermore, an asphalt layer 42 is laid on the UHPC layer 41 to form a rigid subbase + elastic surface structure. The UHPC layer 41 provides high strength and high stiffness support, while the asphalt layer 42 provides good flexibility and deformation coordination. This not only effectively improves the overall wear resistance of the bridge deck pavement but also acts as a buffer and energy dissipator under vehicle loads, reducing the impact of impacts on the substructure. The thickness H2 of the UHPC layer 41 is four times the thickness H3 of the asphalt layer 42, achieving a more optimized match between the rigid and elastic layers in terms of structural stress and deformation coordination. This ensures sufficient overall stiffness and load-bearing capacity of the reinforced structure while avoiding stress concentration problems caused by abrupt changes in stiffness, thereby improving the structural performance and durability. For example, with a 20cm reinforced structure, the thickness H2 of the UHPC layer 41 is 16cm, and the thickness H3 of the asphalt layer 42 is 4cm.
[0036] Furthermore, in step S30, a connecting hole is provided on the I-beam 2 along the longitudinal direction of the bridge. When the reinforcing mesh 3 is laid, the second reinforcing bar 31, whose length extends along the longitudinal direction of the bridge, passes through the connecting hole, so that the second reinforcing bar 31 is welded or tied to the I-beam 2. During the laying of the reinforcing mesh 3, the second reinforcing bar 31, which extends along the longitudinal direction of the bridge, passes through the connecting hole on the I-beam 2, thereby realizing a spatial through-connection between the second reinforcing bar 31 and the I-beam 2, improving the ease of installation of the second reinforcing bar 31; by connecting the second reinforcing bar 31 to the I-beam 2 by welding or tying, the I-beam 2 and the second reinforcing bar 31 form a reliable overall force-bearing system, enhancing the continuity of force transmission between components, and facilitating the uniform transmission and diffusion of loads.
[0037] In addition, when the existing bridge deck is removed in step S10, a certain length of the steel bars laid in the existing bridge deck can be retained and connected to the newly laid reinforcement structure steel mesh 3. Thus, the mechanical connection and overall integration of the old and new structures can be achieved through the continuous pouring of the UHPC layer 41. This can effectively maintain the continuity between the existing bridge deck and the reinforcement layer 4 and avoid cracks or peeling problems caused by sudden changes in stiffness or stress concentration at the interface between the old and new structures.
[0038] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A reinforcement structure for the continuous ends of existing hollow slab beams on a bridge deck, used to reinforce the continuous ends of two sets of hollow beam groups arranged longitudinally along the bridge, each set of hollow beam groups comprising multiple hollow slab beams arranged transversely along the bridge, characterized in that, include: The first reinforcing bar is embedded in each of the hollow slab beams, and the first reinforcing bar is partially protruding from the hollow slab beam; I-beams, each hollow beam group is provided with a plurality of I-beams spaced apart along the longitudinal direction of the bridge, the length of the I-beams extends laterally along the bridge, and at least two first reinforcing bars are provided between two adjacent I-beams on each hollow slab beam; A steel mesh is provided at least two layers of the steel mesh at intervals along the vertical direction on the first steel bar protruding from the hollow slab beam. All the first steel bars are connected to the steel mesh. The steel mesh covers the continuous ends of the two sets of hollow beams. The vertical direction, the longitudinal direction of the bridge, and the transverse direction of the bridge are arranged perpendicular to each other. The reinforcement layer includes a UHPC layer and an asphalt layer. The UHPC layer covers the first reinforcing bar, the I-beam, and all the reinforcing mesh. The asphalt layer is disposed on the UHPC layer.
2. The reinforcement structure for the continuous end of the existing hollow slab beam of the bridge deck according to claim 1, characterized in that, The web of the I-beam has at least two sets of connecting holes that run longitudinally through the bridge. The two sets of connecting holes are spaced apart in the vertical direction. Each set of connecting holes includes multiple connecting holes spaced apart in the transverse direction of the bridge. The steel mesh has multiple second steel bars spaced apart in the transverse direction of the bridge. The second steel bars pass through the connecting holes.
3. The reinforcement structure for the continuous end of the existing bridge deck hollow slab beam according to claim 2, characterized in that, The spacing between two adjacent second reinforcing bars along the transverse direction of the bridge is D1, and the spacing between two adjacent I-beams along the longitudinal direction of the bridge is D2, where D2 = 2D1.
4. The reinforcement structure for the continuous end of the existing bridge deck hollow slab beam according to claim 1, characterized in that, The first reinforcing bar includes a vertically arranged support portion and a first connecting portion. The support portion is partially embedded within the hollow slab beam, and its length extends vertically. The first connecting portion is located at the end of the support portion away from the hollow slab beam, and its length extends laterally along the bridge. The reinforcing mesh located away from the hollow slab beam is connected to the first connecting portion; or... The first reinforcing bar includes a support portion, a first connecting portion, and a second connecting portion. The support portion is partially embedded in the hollow slab beam. The length of the support portion extends vertically. The first connecting portion and the second connecting portion are spaced apart along the vertical direction on the support portion. The lengths of the first connecting portion and the second connecting portion both extend horizontally along the bridge. The reinforcing mesh is provided in two layers, and the first connecting portion and the second connecting portion are each connected to one layer of the reinforcing mesh.
5. The reinforcement structure for the continuous end of the existing hollow slab beam of a bridge deck according to claim 4, characterized in that, The diameter of the support part is D3, where D3 ≥ 12 mm, and the depth to which the support part is embedded in the hollow slab beam is H1, where H1 ≥ 10D3.
6. The reinforcement structure for the continuous end of an existing hollow slab beam of a bridge deck according to any one of claims 1-5, characterized in that, The hollow slab beam has multiple recessed receiving grooves, and the UHPC layer extends into the receiving grooves.
7. The reinforcement structure for the continuous end of an existing hollow slab beam of a bridge deck according to any one of claims 1-5, characterized in that, It also includes ribbed steel bars, the two ends of which are respectively embedded in the UHPC layer and the asphalt layer.
8. The reinforcement structure for the continuous end of an existing hollow slab beam of a bridge deck according to any one of claims 1-5, characterized in that, The material composition of the UHPC layer is as follows: 700-850 parts of 52.5 grade silicate cement, 200-300 parts of silica fume, 1000-1200 parts of quartz sand, 150-250 parts of steel fiber, 30-50 parts of water-reducing agent, and 180-210 parts of water.
9. A method for reinforcing the continuous end of an existing hollow slab beam of a bridge deck, characterized in that, The specific steps for forming the reinforcement structure for the continuous end of the existing hollow slab beam of the bridge deck as described in any one of claims 1-8 include: S10. Taking the center line of the continuous end between the two groups of hollow bridges arranged longitudinally along the bridge as the center, at least 3 meters of the existing bridge deck is removed along the longitudinal direction of the bridge to expose the continuous end of the hollow slab beam. S20. Multiple positioning grooves are made on the hollow slab beam, and asphalt, cement concrete pavement, oil stains and laitance are removed from the surface of the hollow slab beam. The first reinforcing bar is inserted into the positioning groove. S30. Multiple I-beams are placed at intervals along the longitudinal direction of the bridge on the hollow slab beam, and then a steel mesh is laid to connect the steel mesh with the first steel bar. At least two layers of the steel mesh are laid on the first steel bar. S40. Pour UHPC material to cover the first reinforcing bar, the reinforcing mesh and the I-beam to form a UHPC layer, and then lay an asphalt layer on the UHPC layer.
10. The reinforcement method for the continuous end of an existing hollow slab beam on a bridge deck according to claim 9, characterized in that, In step S30, a connecting hole is provided through the I-beam along the longitudinal direction of the bridge. When the steel mesh is laid, a second steel bar extending along the longitudinal direction of the bridge is provided through the connecting hole, so that the second steel bar is welded or tied to the I-beam.