Deck repair paving structure
By introducing shear studs, UHPC grouting layers, and TRC wearing layers into the bridge deck pavement structure, the problems of long construction cycles and significant traffic disruptions in bridge deck pavement maintenance have been solved, enabling rapid and durable bridge deck repair and ensuring the continuity of BRT operations and driving safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU JIANGONG ROAD & BRIDGE CONSTR
- Filing Date
- 2025-05-28
- Publication Date
- 2026-06-09
AI Technical Summary
Existing bridge deck pavement maintenance technologies suffer from problems such as long construction cycles, significant traffic disruptions, insufficient material performance, and poor interlayer coordination. This makes the bridge deck pavement layer prone to damage under heavy vehicle loads, especially in the BRT station area where frequent starts and stops lead to concentrated dynamic loads and reduced material shear strength under high-temperature conditions, creating a vicious cycle of repair and destruction.
The bridge deck maintenance structure employs shear studs, a UHPC grouting layer, prefabricated UHPC panel assemblies, and a TRC wear layer. The shear studs are fixed to the bridge deck steel plates, the UHPC grouting layer and the prefabricated UHPC panel assemblies are connected through holes, and the TRC wear layer is directly laid on the prefabricated UHPC panels. By utilizing the ultra-high durability of UHPC and the high-temperature stability and low-temperature flexibility of TRC, rapid maintenance and improved pavement durability can be achieved.
It enables rapid repair of bridge deck pavement, improves the durability and driving safety of bridge deck pavement, reduces the disruption of construction to traffic, and ensures the continuity of BRT operation and driving comfort.
Smart Images
Figure CN224338118U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of road and bridge engineering technology, and specifically relates to a pavement structure for bridge deck maintenance. Background Technology
[0002] Asphalt concrete pavement for steel box girders is a crucial component of urban rapid transit systems, widely used in BRT (Bus Rapid Transit) lanes and station areas. However, due to the combined effects of the structural characteristics of steel box girders and the operating patterns of BRT vehicles, the pavement layer is highly susceptible to defects such as rutting, bulging, potholes, and shoving during its service life. Particularly in BRT station areas, the frequent starts and stops of vehicles at fixed points result in highly concentrated dynamic loads. Furthermore, the high thermal conductivity of steel box girders (approximately 50 times that of concrete) leads to a significant increase in the temperature of the asphalt concrete (AC) pavement layer under high summer temperatures, causing a sharp decrease in the material's shear strength and further exacerbating interlayer shear failure and fatigue damage.
[0003] Traditional bridge deck pavement maintenance techniques typically employ localized patching or milling and repaving. For small areas of damage, patching is often used; while quick, it results in poor adhesion between the old and new materials, making secondary delamination more likely. For large areas, maintenance requires milling the damaged asphalt pavement before repaving with new asphalt, a lengthy process that severely hinders the normal operation of BRT lines. Using traditional bridge deck pavement maintenance techniques, the pavement layer, due to insufficient material performance, structural design flaws, and poor interlayer coordination, re-emerges under the repeated horizontal shear forces of heavy vehicles within a short period (1-3 months, even shorter in the hot summer months), creating a vicious cycle of "repair-destruction." In addition, BRT serves the function of transporting passengers over long distances, with high capacity and speed in cities. BRT lanes and stations are relatively fixed and are not easily adjusted. Long-term road closures are not allowed for lane maintenance in BRT station areas. However, conventional milling and repaving maintenance generally involves milling, manually removing residual asphalt concrete, cleaning residual waterproofing layer on the surface of steel box girders, re-constructing the waterproofing layer, and repaving the asphalt surface layer. The process is complicated, the construction period is long, and it has a significant impact on traffic.
[0004] In summary, existing bridge deck pavement maintenance technologies have many shortcomings and urgently need to be improved. While ensuring construction efficiency, these technologies should significantly enhance the pavement's resistance to rutting, shear strength, and fatigue life to address the industry pain points of long maintenance cycles and significant traffic disruption in existing technologies. Utility Model Content
[0005] The purpose of this utility model is to provide a pavement structure for bridge deck repair that addresses the aforementioned shortcomings, enabling rapid repair of defects in asphalt concrete bridge decks and improving the durability of the repaired pavement, thus ensuring driving safety and comfort. To achieve the above objectives, this utility model provides the following technical solution:
[0006] A pavement structure for bridge deck maintenance includes shear studs, a UHPC grout layer, a prefabricated UHPC slab assembly, and a TRC wear layer; the UHPC grout layer, the prefabricated UHPC slab assembly, and the TRC wear layer are laid sequentially on the bridge deck steel plate from bottom to top; the prefabricated UHPC slab assembly has a plurality of holes; shear studs are installed in the holes; one end of each shear stud passes through the UHPC grout layer and is fixed to the bridge deck steel plate.
[0007] Furthermore, the prefabricated UHPC panel assembly includes several prefabricated UHPC panel units; the prefabricated UHPC panel units are disposed in the UHPC grouting layer, and wet joints are provided between adjacent prefabricated UHPC panel units; the wet joints are provided with connecting structures.
[0008] Furthermore, the connection structure includes reinforcing bars and UHPC grout; the reinforcing bars are the portion of the UHPC grout layer that is set inside the UHPC grout layer and penetrates the exposed portion of the UHPC grout layer, and are located within the wet joint; the UHPC grout fills the wet joint and wraps around the reinforcing bars.
[0009] Furthermore, the diameter of the hole is 4cm to 6cm, which is larger than the diameter of the shear stud.
[0010] Furthermore, the thickness of the UHPC grouting layer is 1.5cm to 2.5cm; the thickness of the TRC wear layer is 7mm to 10mm.
[0011] Furthermore, the thickness of the prefabricated UHPC panel assembly is 5cm to 7cm, the width is 2.5m to 3m, and the length is 2.5m to 3m.
[0012] The beneficial effects of this utility model are:
[0013] This utility model discloses a pavement structure for bridge deck maintenance, comprising shear studs, a UHPC grouting layer, a precast UHPC slab assembly, and a TRC wearing layer. The UHPC grouting layer, the precast UHPC bridge deck panel, and the TRC wearing layer are laid sequentially on the bridge deck steel plate from bottom to top. The precast UHPC slab assembly has several holes; shear studs are installed in the holes; one end of each shear stud passes through the UHPC grouting layer and is fixed to the bridge deck steel plate. This pavement structure for bridge deck maintenance fully utilizes the ultra-high durability and ultra-high mechanical properties of UHPC, as well as the strong high-temperature stability, strong resistance to water damage, and strong low-temperature flexibility of TRC, enabling rapid repair of defects in asphalt concrete bridge decks, improving the durability of the repaired bridge deck pavement, ensuring driving safety and comfort, and enhancing overall efficiency. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the prefabricated UHPC panel unit and wet joint of this utility model;
[0016] In the attached diagram: 1-shear stud, 2-UHPC grouting layer, 3-precast UHPC panel assembly, 4-TRC wear layer, 5-precast UHPC panel unit, 6-hole, 7-wet joint, 8-reinforcing steel, 9-UHPC grouting material, 10-original bridge. Detailed Implementation
[0017] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0018] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.
[0019] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.
[0020] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. The meaning of such spatial relative terms includes different orientations of the device in use or operation, in addition to the orientation depicted in the figure. For example, if the device in the figure is flipped, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.
[0021] Ultra-high performance concrete (UHPC) is the most innovative cement-based engineering material of the past thirty years, achieving a major leap in the performance of engineering materials. UHPC has ultra-high durability and ultra-high mechanical properties, with compressive strength exceeding 120 MPa, tensile strength exceeding 9 MPa, and flexural tensile strength exceeding 22 MPa, far exceeding the performance indicators of ordinary concrete road (bridge) pavements.
[0022] Example 1
[0023] See attached Figures 1-2A pavement structure for bridge deck maintenance includes shear studs 1, a UHPC grouting layer 2, prefabricated UHPC panel assemblies 3, and a TRC wear layer 4. The UHPC grouting layer 2 is laid on the original bridge deck steel plate 10. The prefabricated UHPC panel assembly 3 includes several prefabricated UHPC panel units 5, which are laid on the UHPC grouting layer 2 at certain intervals. Finally, the TRC wear layer 4 is laid on the prefabricated UHPC panel assembly 3. Among them, UHPC represents ultra-high performance concrete. UHPC grouting layer 2 is a cast-in-place structure composed of premixed dry powder, mixing water, water-reducing agent, and high-strength fiber. The premixed dry powder, mixing water, water-reducing agent, and high-strength fiber are strictly mixed in proportion to form a highly fluid and widely expandable grout. This grout can reach a strength of over 30MPa within 2-3 hours, meeting the requirements for traffic opening. After final setting, its compressive strength can reach over 120MPa, tensile strength over 9MPa, and flexural tensile strength over 22MPa, far exceeding the performance indicators of ordinary concrete road (bridge) pavements. Precast UHPC slab unit 5 is a factory-prefabricated structure... On-site hoisting saves time required for curing cast-in-place UHPC. The compressive strength can reach over 120MPa, the tensile strength can reach over 9MPa, and the flexural strength can reach over 22MPa, far exceeding the performance indicators of ordinary concrete road (bridge) pavement. The TRC wear layer 4 is a high-toughness polymer concrete layer composed of tough resin and wear-resistant aggregate. It is directly laid on the precast UHPC slab assembly 3. The TRC wear layer 4 has high bonding performance, is not easy to peel off from the base layer, has low curing shrinkage, and has the characteristics of strong high temperature stability, strong water damage resistance, and strong low temperature flexibility. Moreover, the construction process of the TRC wear layer 4 is simple, and the road can be opened to traffic in about 3 hours after construction. In addition, several holes 6 are provided on the precast UHPC slab unit 5, and shear nails 1 are installed in the holes 6. One end of the shear nail 1 passes through the UHPC grouting layer 2 and is welded to the bridge deck steel plate of the original bridge 10. Its main function is to transfer shear force and prevent relative slippage between the UHPC grouting layer 2 and the precast UHPC slab assembly 3 and the original bridge 10. The pavement structure for bridge deck maintenance of this utility model fully utilizes the ultra-high durability and ultra-high mechanical properties of UHPC, as well as the characteristics of TRC, such as strong high-temperature stability, strong resistance to water damage, and strong low-temperature flexibility. It improves the situation where the original pure asphalt mixture structure of the bridge deck pavement is prone to repeated rutting, slugging, potholes, and shoving. It enables rapid construction of asphalt concrete pavement maintenance for the BRT station area, improves the durability of the bridge deck pavement after maintenance, ensures driving safety and comfort, and enhances overall benefits.
[0024] Specifically, the precast UHPC panel unit 5 is a concrete structure. A wet joint 7 is provided between adjacent precast UHPC panel units 5. The width of the wet joint 7 is 20cm to 30cm. A connecting structure is provided in the wet joint 7. The connecting structure includes the exposed steel bars 8 that penetrate the precast UHPC panel unit 5 and UHPC grout 9. After the adjacent steel bars 8 located in the same wet joint 7 are tied and fixed, the UHPC grout 9 is poured in place to fill the wet joint 7 and wrap the steel bars 8.
[0025] Specifically, the dimensions of the prefabricated UHPC panel unit 5 can be flexibly adjusted, with a thickness of 5cm to 7cm, a width generally the width of a driveway (typically 2.5 to 3m), and a length generally 2.5 to 3m; the thickness of the UHPC grouting layer 2 is 1.5cm to 2.5cm; and the thickness of the TRC wear layer 4 is 7mm to 10mm.
[0026] Specifically, quincunx-shaped holes 6 with a diameter of 4cm-6cm are provided on the precast UHPC panel unit 5. The length of the shear studs 1 should be greater than the thickness of the UHPC grouting layer 2 but less than the sum of the thickness of the UHPC grouting layer 2 and the total thickness of the precast UHPC panel unit 5. The diameter of the holes 6 should be greater than the diameter of the shear studs 1 to facilitate grouting from the holes 6 into the precast UHPC panel unit 5, forming the UHPC grouting layer 2. The gap between the shear studs 1 and the holes 6 is filled with UHPC grout.
[0027] Example 2
[0028] The construction method and steps for the pavement structure for bridge deck repair according to this utility model are as follows:
[0029] 1. Milling and cleaning of the original bridge deck pavement. Milling was performed using a milling machine, with strict control over the milling depth to avoid damaging the original bridge's waterproof layer and steel plates. Any remaining asphalt mixture after milling was manually cleaned to ensure the bridge deck was dry and clean before the waterproof layer was applied.
[0030] 2. Repair of the damaged waterproofing layer on the original bridge deck. After the bridge deck is cleaned, the damaged waterproofing layer will be repaired.
[0031] 3. Weld shear studs. Mark the welding positions of shear studs 1 on the bridge deck according to the pre-drilled holes 6 in the prefabricated UHPC panel assembly 3. Use a handheld grinder to grind and clean the waterproof layer at the welding positions of shear studs 1, exposing the steel bridge deck panel. Weld the shear studs 1 to the bridge deck steel plate using circumferential welding. The installation spacing of shear studs 1 should refer to the bridge design drawings, with a maximum spacing controlled at 30cm × 30cm.
[0032] 4. Hoisting of Precast UHPC Panel Units. Before hoisting, measure the relative elevation of the original bridge deck (10) and calculate the height of the temporary support plates to ensure the height of the UHPC grouting layer (2) and the level of the precast UHPC panel unit (5). Temporary support plates are available in various thicknesses (1.5cm, 0.5cm, 0.2cm, 0.1cm) and dimensions (10cm x 10cm), with an installation spacing of 1cm x 1m. The precast UHPC panel unit (5) is hoisted using a four-point hoisting method, connecting it to the wire rope via clips. Precise positioning is required during hoisting to ensure that all shear studs (1) fall within the pre-drilled holes (6) of the precast UHPC panel unit (5).
[0033] 5. Bind the reinforcing bars in the wet joint. Use galvanized binding wire to bind and fix the reinforcing bars 8 of the two adjacent bridge deck panels located in the wet joint 7.
[0034] 6. UHPC Grouting. Strictly follow the instructions to mix the premixed dry powder, mixing water, water-reducing agent, and high-strength fibers using a small mixer to form a grouting material. After mixing, inject this grouting material between the precast UHPC panel assembly 3 and the original bridge deck 10 through wet joints 7 and holes 6. The mixture has high fluidity and wide spread, easily filling the gaps between the precast UHPC panel unit 5 and the original bridge deck 10 to form the UHPC grouting layer 2 and UHPC grouting material 9. When the holes 6 and the area around the panel are filled with grout without significant sinking, the bottom of the precast UHPC panel unit 5 can be considered saturated with grout. The grouting material is injected through holes 6 to ensure, on the one hand, that the precast UHPC panel assembly 3 and the original bridge deck 10 are filled and compacted by the grouting material to the maximum extent; on the other hand, shear studs 1 are inserted into holes 6, and after grouting, the UHPC will tightly wrap around the shear studs 1, connecting the precast UHPC panel assembly 3 and the UHPC grouting layer 2 into a whole, thus better utilizing the various performance characteristics of the pavement structure for bridge deck maintenance. When the strength of the UHPC grouting layer reaches 30 MPa or above, traffic can be opened without the need for subsequent construction of the TRC wearing layer 4, reducing the time occupied per unit of road occupancy and minimizing the impact of construction on BRT operation.
[0035] 7. TRC Wear Layer Construction. Before construction, clean all debris and dust from the precast UHPC panel unit 5 to ensure the substrate is dry and clean. During construction, a specialized ultra-thin overlay machine is used to simultaneously spray modified epoxy resin adhesive and apply wear-resistant coarse and fine aggregates, forming a single layer. After the modified epoxy resin adhesive has cured (approximately 3 hours), traffic can be opened.
[0036] All technical features in this embodiment can be freely combined according to actual needs. The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.
[0037] The above embodiments are preferred implementations of this utility model. In addition, other implementations are also included. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.
Claims
1. A pavement structure for bridge deck maintenance, characterized in that: It includes shear studs (1), UHPC grouting layer (2), prefabricated UHPC panel assembly (3) and TRC wear layer (4); the UHPC grouting layer (2), prefabricated UHPC panel assembly (3) and TRC wear layer (4) are laid on the bridge deck steel plate from bottom to top; the prefabricated UHPC panel assembly (3) has several holes (6); the holes (6) are provided with shear studs (1); one end of the shear studs (1) passes through the UHPC grouting layer (2) and is fixed to the bridge deck steel plate.
2. The pavement structure for bridge deck maintenance according to claim 1, characterized in that: The prefabricated UHPC panel assembly (3) includes several prefabricated UHPC panel units (5); the prefabricated UHPC panel units (5) are disposed in the UHPC grouting layer (2), and a wet joint (7) is provided between adjacent prefabricated UHPC panel units (5); the wet joint (7) is provided with a connecting structure.
3. The pavement structure for bridge deck maintenance according to claim 2, characterized in that: The connection structure includes a steel bar (8) and UHPC grout (9); the steel bar (8) is the part of the UHPC grout layer (2) that is set inside the UHPC grout layer (2) and penetrates the exposed part of the UHPC grout layer (2), and is located in the wet joint (7); the UHPC grout (9) fills the wet joint (7) and wraps the steel bar (8).
4. The pavement structure for bridge deck maintenance according to claim 1, characterized in that: The diameter of the hole (6) is 4cm to 6cm, which is larger than the diameter of the shear stud (1).
5. The pavement structure for bridge deck maintenance according to claim 1, characterized in that: The thickness of the UHPC grouting layer (2) is 1.5cm to 2.5cm; the thickness of the TRC wear layer (4) is 7mm to 10mm.
6. The pavement structure for bridge deck maintenance according to claim 1, characterized in that: The thickness of the prefabricated UHPC panel assembly (3) is 5cm to 7cm, the width is 2.5m to 3m, and the length is 2.5m to 3m.