A concrete bridge deck slab reinforcing structure and a construction method thereof

Abstract

The application relates to a concrete bridge deck slab reinforcing structure and a construction method thereof, which comprises an original concrete bridge deck slab and a pavement layer arranged on the top of the original concrete bridge deck slab, the material of the pavement layer is light super high performance concrete, a steel bar layer is arranged in the original concrete bridge deck slab and the pavement layer, a hook connecting steel bar is used for connecting the steel bar layers in the original concrete bridge deck slab and the pavement layer, prestressed grooves are arranged along the bridge direction at equal intervals, the prestressed grooves are arranged along the transverse direction of the bridge, and a complete set of prestressed bars are arranged in the prestressed grooves. The application provides a concrete bridge deck slab reinforcing structure and a construction method thereof, light super high performance concrete is used as a cover, and hook connecting steel bars are arranged between the original concrete bridge deck slab and a new pavement layer. Meanwhile, prestress is applied between the pavement layer and the original bridge top plate, the bending stiffness of the concrete slab structure is enhanced, the bridge structure is subjected to force as a whole, and the durability and driving safety of the structure are improved.

Description

Technical Field

[0001] This application relates to the field of bridge deck reinforcement technology, and in particular to a reinforcement structure for concrete bridge decks and its construction method. Background Technology

[0002] With the rapid development of my country's social economy, the traffic volume on the highway network has been increasing year by year. Coupled with the large number of trucks and the serious problem of overloading, these factors have led to an increasingly prominent issue of fatigue cracking in the original concrete bridge decks. During the service life of bridges, due to the long-term exposure to these adverse effects, their structures and components inevitably experience varying degrees of deterioration and continuous accumulation of damage. This significantly reduces the safety and stability of the bridge structure, affecting normal use, shortening its service life, and even causing sudden damage or collapse, resulting in irreparable consequences. Given that many early-built bridges no longer meet the actual needs of current traffic operations, corresponding renovation work is urgently needed. Summary of the Invention

[0003] This application provides a reinforced structure for concrete bridge deck and its construction method to solve the problems in the related technology where the safety and stability of the bridge deck are reduced due to various stresses caused by traffic loads.

[0004] In a first aspect, a reinforced structure for a concrete bridge deck is provided, comprising: an original concrete bridge deck and a pavement layer disposed on top thereon, wherein both the original concrete bridge deck and the pavement layer are provided with a steel reinforcement layer, wherein the original concrete bridge deck is provided with a plurality of interlocking steel reinforcement slots along the transverse direction, wherein the steel reinforcement layer in the original concrete bridge deck passes through the plurality of interlocking steel reinforcement slots, wherein interlocking steel reinforcements are provided in the interlocking steel reinforcement slots, and wherein the interlocking steel reinforcements are used to connect the original concrete bridge deck and the steel reinforcement layer in the pavement layer.

[0005] Prestressed grooves are provided at equal intervals along the longitudinal direction of the bridge, and the prestressed grooves are provided along the transverse direction of the bridge. A set of prestressed tendons are placed in the prestressed grooves.

[0006] In some embodiments, the reinforcing steel layer includes at least transverse reinforcing steel, the upper end of the connecting reinforcing steel is connected to the transverse reinforcing steel of the pavement layer, and the lower end of the connecting reinforcing steel is connected to the transverse reinforcing steel of the original concrete bridge.

[0007] In some embodiments, prestressed grooves are provided at equal intervals along the longitudinal direction of the bridge, and the prestressed grooves are provided along the transverse direction of the bridge, with a set of prestressed tendons placed in the prestressed grooves.

[0008] In some embodiments, the original concrete bridge deck is provided with prestressed tendon anchor blocks along the bridge direction. The prestressed tendon includes a tensioning end and a fixing end. The tensioning end is fixed at the end of the bridge deck, and the fixing end is fixed inside the prestressed tendon anchor block.

[0009] In some embodiments, the prestressed tendon anchor has a portion located above the original concrete bridge deck and a portion located below it, and the ratio of the height of the upper part of the prestressed tendon anchor to the height of the lower part of the bridge deck is 1.5 to 2.5.

[0010] In some embodiments, the interlocking steel bar slots along the bridge direction are staggered.

[0011] In some embodiments, hooks are provided at both ends of the connecting steel bars, with the hook angle between 90 degrees and 135 degrees, and the hook diameter is larger than the diameter of the connected steel bars.

[0012] In some embodiments, the pavement layer is made of lightweight ultra-high performance concrete.

[0013] Secondly, a construction method for reinforcing concrete bridge decks is provided, including the following steps:

[0014] Bridge deck pretreatment: After removing the original asphalt pavement layer, the original concrete surface of the bridge is roughened.

[0015] Grooving: Based on the location of the newly added prestressed tendons, mark the position and mark the lines. Use hydraulic cutting equipment or other suitable cutting tools to open prestressed grooves on the original concrete bridge deck. Chisel the groove holes for the connecting reinforcing bars according to their positions, ensuring that the grooves are deep enough for the connecting reinforcing bars to pass through the bottom of the transverse reinforcing bars of the bridge deck.

[0016] Reinforcement arrangement: Place prestressing tendons in the prestressing trench, arrange longitudinal and transverse reinforcement layers in the pavement layer, arrange connecting reinforcement, and connect the original transverse reinforcement of the concrete to the transverse reinforcement of the pavement layer.

[0017] Concrete pouring: Set up partition templates and pour lightweight ultra-high performance concrete for the pavement layer in batches, and wait for the pavement layer concrete to cure to a certain strength;

[0018] Tensioning: According to the design requirements, the prestressed tendons are tensioned sequentially to the design strength value, and then the anchorage at the tensioning end is closed to complete the tensioning.

[0019] In some embodiments, the grooving step further includes chiseling prestressed tendon anchor block grooves along the longitudinal direction of the concrete bridge deck.

[0020] The reinforcement arrangement step also includes placing the fixed end of the prestressed tendon in the prestressed tendon anchor block groove, and installing a steel pad and nut at the tensioning end of the prestressed tendon for pre-tightening.

[0021] In some embodiments, during the concrete pouring step, the prestressed tendon anchor block groove is poured together to seal the fixed end.

[0022] This application provides a reinforced concrete bridge deck structure and its construction method. By setting a pavement layer on the original concrete bridge deck, and by creating interlocking steel bar slots and placing interlocking steel bars to connect the original concrete bridge deck and the steel bar layer within the pavement layer, and by applying prestress between the pavement layer and the original bridge deck, the load can be effectively transferred and dispersed, increasing the overall stiffness of the structure and thus enhancing the load-bearing capacity of the bridge deck. Furthermore, it reduces the relative displacement and cracking between the pavement layer and the original concrete bridge deck, enhancing the integrity and synergistic stress-bearing performance between the old and new concrete structures. This allows the reinforced bridge deck to better withstand external forces such as vehicle loads, improving the overall safety and stability of the bridge structure and extending its service life. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a plan view of a concrete bridge deck reinforcement structure provided in an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the AA cross-sectional structure of a concrete bridge deck reinforcement structure provided in an embodiment of this application.

[0026] Figure 3 This is a schematic diagram of the BB cross-section structure of a concrete bridge deck reinforcement structure provided in an embodiment of this application.

[0027] In the diagram: 1. Original concrete bridge deck; 2. Pavement layer; 3. Connecting rebar slots; 4. Connecting rebar; 5. Transverse rebar of pavement layer; 6. Transverse rebar of original concrete bridge; 7. Prestressed trench; 8. Prestressed tendon; 9. Prestressed tendon anchor block. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] This application provides a concrete bridge deck reinforcement structure to solve the problems in the related technology where the safety and stability of the bridge deck are reduced due to various stresses caused by traffic loads.

[0030] like Figures 1 to 3 As shown, a reinforced concrete bridge deck structure includes an original concrete bridge deck 1 and a pavement layer 2 on top of it. The pavement layer 2 is made of lightweight ultra-high performance concrete with a tensile strength ≥5MPa and a compressive strength ≥100MPa. This material has low density and excellent mechanical properties such as compressive and tensile strength, and works well with the original concrete bridge deck 1. The pavement layer 2 has a thickness of 50~80mm and contains steel fibers, the amount of which is determined according to the actual performance requirements.

[0031] Both the original concrete bridge deck 1 and the pavement layer 2 contain reinforcing steel layers. The original concrete bridge deck 1 has several interlocking steel bar slots 3 along the transverse direction. These slots 3 contain interlocking steel bars 4, which are spaced along the prestressing tendons 8. The interlocking steel bars 4 between adjacent prestressing tendons 8 are staggered, which helps optimize the force distribution of the bridge during stress loading and reduces the risk of stress concentration and localized damage. The interlocking steel bars 4 have 90° hooks at both ends, with the hook diameter larger than the diameter of the connected steel bar to ensure a good connection. These interlocking steel bars 4 connect the reinforcing steel layers in the original concrete bridge deck 1 and the pavement layer 2, preventing separation between the two layers.

[0032] The reinforcing layer includes transverse and longitudinal reinforcement. Due to the susceptibility of ordinary steel bars to corrosion and their heavy weight, glass fiber reinforced plastic (GFRP) bars are preferred. GFRP bars have a tensile strength ≥800MPa, an elastic modulus ≥45GPa, and a unit weight of approximately 2000kg / m³. It is far lower than the density of ordinary steel bars (7850 kg / m³). The upper end of the connecting steel bar 4 is connected to the transverse steel bar 5 of the pavement layer, and the lower end of the connecting steel bar 4 is connected to the transverse steel bar 6 of the original concrete bridge deck. The connecting steel bar 4 hooks the transverse steel bar in the original concrete bridge deck 1 and the transverse steel bar in the pavement layer 2, which helps to optimize the force distribution of the bridge during the stress process, reduce the risk of stress concentration and local damage, form a tighter and more stable connection, reduce the relative displacement and crack generation between the pavement layer 2 and the original concrete bridge deck 1, thereby enhancing the durability of the bridge.

[0033] To prevent the prestressing tendons 8 from detaching from the pavement layer 2, and to increase the bonding area between the pavement layer 2 and the original concrete bridge deck 1, and to facilitate the arrangement of the prestressing tendons 8, prestressing grooves 7 are excavated along the transverse direction of the original concrete bridge deck 1 to accommodate the prestressing tendons 8. The prestressing grooves 7 are grooves of a certain length, width, and height opened on the original concrete bridge deck 1 according to the diameter, length, and spacing of the prestressing tendons 8. The prestressing tendons 8 are arranged inside the grooves of the original concrete bridge deck 1, and are unbonded prestressed, tensioned after the concrete pavement layer 2 has cured. Simultaneously with the installation of connecting steel bars 4, prestress is applied between the pavement layer 2 and the original concrete bridge deck 1, enhancing the structural bending stiffness, allowing the entire bridge structure to share the load, and improving the structural durability and traffic safety.

[0034] The prestressing tendon 8 includes a tensioning end and a fixed end, both of which include a steel pad, a nut, a threaded steel sleeve, and a spiral reinforcement. After tensioning, the prestressing tendon 8 is tightened with a nut to maintain the set pretension value.

[0035] The tensioning end is located at the end of the original concrete bridge deck 1. After tensioning is completed by jacks, the tensioning end is sealed by anchoring to prevent contact with the outside world; or an anchorage protective cover is installed to isolate it from the external environment and prevent corrosion.

[0036] The fixed end is located at the central median strip of the original concrete bridge deck 1. To better anchor the fixed end, prestressed tendon anchor blocks 9 are installed on the bridge deck, including the upper and lower parts of the bridge deck. Specifically, a long groove for the prestressed tendon anchor block 9 is chiseled along the longitudinal direction of the bridge on the original concrete bridge deck 1, and the upper height of the prestressed tendon anchor block 9 on the bridge deck is approximately twice the height of the lower part. The anchoring ends of the prestressed tendons 8 are arranged in the long groove, and the prestressed tendon anchor blocks 9 are poured together with the concrete of the pavement layer 2 to form the anchoring end.

[0037] A construction method for reinforcing a concrete bridge deck includes the following steps:

[0038] Using tools and equipment, after removing the original asphalt pavement layer, the original concrete surface 1 of the bridge is roughened to better bond the original concrete bridge deck 1 with the pavement layer 2 and enhance their overall integrity.

[0039] Nine grooves for prestressed tendon anchor blocks were excavated along the bridge direction on the concrete bridge deck.

[0040] Based on the location of the newly added prestressed tendons 8, positioning lines are marked with a spacing of 30cm~60cm. Prestressed grooves 7 are opened in the original concrete bridge deck 1 using hydraulic cutting equipment. The width and depth of the grooves are controlled to avoid protruding stones in the grooves, which would affect the shape of the prestressed tendons 8.

[0041] According to the location of the connecting steel bar 4, chisel out the connecting steel bar slot 3 of a certain size to expose the original concrete transverse bridge steel bar 6. The chiseling depth is required to ensure that the connecting steel bar 4 passes through the bottom of the transverse steel bar of the bridge deck. The connecting steel bar slot 3 should be avoided at the connection of longitudinal and transverse steel bars, and it is best to be between longitudinal steel bars.

[0042] Prestressing tendons 8 are placed in the prestressing trench 7, and the fixed ends are placed in the grooves of the prestressing tendon anchor blocks 9.

[0043] Arrange the longitudinal and transverse steel mesh in the pavement layer 2, and determine the spatial position of the steel mesh according to the thickness of the pavement layer 2;

[0044] Arrange the connecting steel bars 4 to connect the original concrete transverse steel bars 6 with the transverse steel bars 5 of the pavement layer;

[0045] Set up a partition template, pour the lightweight ultra-high performance concrete of the pavement layer 2 in batches along the original concrete bridge deck 1, control its flowability to meet the requirements of the bridge deck slope; pour the concrete at the prestressed tendon anchor block 9 at the same time, so that the upper height of the prestressed tendon anchor block 9 on the bridge deck is about twice the lower height, and close the fixed end of the prestressed tendon 8.

[0046] After the concrete of pavement layer 2 has cured to a certain strength, the prestressing tendons 8 are tensioned sequentially to the design strength value according to the design requirements. Then the anchorages at the tensioning ends are sealed to complete the tensioning process.

[0047] Finally, an asphalt macadam layer may be laid on top of pavement layer 2 as needed.

[0048] This invention provides a reinforced concrete bridge deck structure and its construction method, using lightweight ultra-high performance concrete as the overlay, and arranging connecting steel bars between the original concrete bridge deck and the new pavement layer. Simultaneously, prestressing is applied between the pavement layer and the original bridge deck to enhance the flexural stiffness of the concrete slab structure, enabling the entire bridge structure to share the load, thus improving the structure's durability and traffic safety.

[0049] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0050] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A reinforcement structure for concrete bridge deck, characterized in that, It includes: an original concrete bridge deck (1) and a pavement layer (2) on top of it. Both the original concrete bridge deck (1) and the pavement layer (2) are provided with a steel reinforcement layer. The original concrete bridge deck (1) is provided with a number of interlocking steel reinforcement slots (3) along the transverse direction of the bridge. The steel reinforcement layer in the original concrete bridge deck (1) passes through the number of interlocking steel reinforcement slots (3). Interlocking steel reinforcement (4) is provided in the interlocking steel reinforcement slots (3). The interlocking steel reinforcement (4) is used to connect the original concrete bridge deck (1) and the steel reinforcement layer in the pavement layer (2). Prestressed grooves (7) are provided at equal intervals along the longitudinal direction of the bridge. The prestressed grooves (7) are provided on the original concrete bridge deck (1) along the transverse direction of the bridge. A set of prestressed tendons (8) are placed in the prestressed grooves (7). The steel reinforcement layer includes at least transverse steel reinforcement, the upper end of the connecting steel reinforcement (4) is connected to the transverse steel reinforcement (5) of the pavement layer, and the lower end of the connecting steel reinforcement (4) is connected to the original concrete transverse bridge steel reinforcement (6). The original concrete bridge deck (1) is provided with prestressed tendon anchor blocks (9) along the bridge direction. The prestressed tendon (8) includes a tensioning end and a fixing end. The tensioning end is fixed at the end of the bridge deck, and the fixing end is fixed inside the prestressed tendon anchor block (9).

2. The concrete bridge deck reinforcement structure as described in claim 1, characterized in that: The prestressed tendon anchor block (9) has a portion located on the upper part of the original concrete bridge deck (1) and a portion located on the lower part, and the ratio of the upper height to the lower height of the prestressed tendon anchor block (9) on the bridge deck is 1.5 to 2.

5.

3. The concrete bridge deck reinforcement structure as described in claim 1, characterized in that: The adjacent interlocking steel bar slots (3) are staggered along the bridge direction.

4. The concrete bridge deck reinforcement structure as described in claim 1, characterized in that: The connecting steel bar (4) has hooks at both ends, with the hook angle between 90 degrees and 135 degrees, and the hook diameter is greater than the diameter of the connected steel bar.

5. The concrete bridge deck reinforcement structure as described in claim 1, characterized in that: The material of the paving layer (2) is lightweight ultra-high performance concrete.

6. A construction method for a concrete bridge deck reinforcement structure as described in any one of claims 1-5, characterized in that, Includes the following steps: Bridge deck pretreatment: After removing the original asphalt pavement layer, roughen the original concrete bridge deck (1). Grooving: According to the location of the newly added prestressed tendons (8), mark the position and use hydraulic cutting equipment to open prestressed grooves (7) in the original concrete bridge deck (1). According to the position of the connecting reinforcement (4), chisel the connecting reinforcement slots (3) with a depth that allows it to pass through the bottom of the transverse reinforcement of the bridge deck. Reinforcement arrangement: Place prestressed tendons (8) in the prestressed trench (7), arrange longitudinal and transverse reinforcement layers in the pavement layer (2), arrange connecting reinforcement (4), and connect the original concrete transverse reinforcement with the pavement layer transverse reinforcement (5). Concrete pouring: Set up partition templates and pour the paving layer (2) lightweight ultra-high performance concrete in batches. Wait for the paving layer (2) concrete to reach a certain strength after curing. Tensioning: According to the design requirements, the prestressed tendons (8) are tensioned sequentially to the design strength value, and then the tensioning end anchor is closed to complete the tensioning.

7. The construction method for the reinforced concrete bridge deck structure according to claim 6, characterized in that: The grooving process also includes chiseling prestressed tendon anchor block (9) grooves along the bridge direction on the concrete bridge deck; The reinforcement arrangement step also includes placing the fixed end of the prestressed tendon (8) in the groove of the prestressed tendon anchor block (9), and installing a steel pad and nut at the tensioning end of the prestressed tendon (8) for pre-tightening.

8. The construction method for the reinforced concrete bridge deck structure according to claim 7, characterized in that: During the concrete pouring process, the prestressed tendon anchor block (9) groove is poured together to seal the fixed end.

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