Concrete bridge deck slab reinforcing structure and construction method thereof

Abstract

The invention relates to a concrete bridge deck slab reinforcing structure and a construction method thereof.The concrete bridge deck slab reinforcing structure comprises an original concrete bridge deck slab and a pavement layer arranged on the top of the original concrete bridge deck slab, the pavement layer is made of light ultra-high performance concrete, and steel bar layers are arranged in the original concrete bridge deck slab and the pavement layer; the hooking steel bars are used for connecting the original concrete bridge deck and a steel bar layer in a pavement layer, prestressed grooves are formed in the bridge direction at equal intervals, the prestressed grooves are formed in the transverse bridge direction, and a set of prestressed tendons are placed in the prestressed grooves. The invention provides a concrete bridge deck slab reinforcing structure and a construction method thereof, light ultra-high performance concrete is used as a cover surface, and hooking steel bars are arranged between an original concrete bridge deck slab and a new pavement layer. Meanwhile, prestress is applied between the pavement layer and the original bridge top plate, so that the flexural rigidity of the concrete slab structure is enhanced, the whole bridge structure is stressed together, and the durability of the structure and the driving safety are improved.

Description

Technical Field

[0001] The present application relates to the technical field of bridge deck reinforcement, and in particular to a concrete bridge deck reinforcement structure and a construction method thereof. Background Art

[0002] With the rapid development of my country's social economy, the traffic volume of the highway network has been increasing year by year. In addition, there are a large number of trucks and the overloading phenomenon is extremely serious. This series of factors has caused the fatigue cracking problem of the original concrete bridge deck to become increasingly prominent. During the service life of the bridge, due to the long-term exposure to such adverse effects, its structure and components inevitably deteriorate to varying degrees and the damage continues to accumulate, which greatly reduces the safety and stability of the bridge structure. At the least, it affects the normal use of the bridge, and at the worst, it shortens the service life of the bridge, and even causes major accidents such as sudden damage and collapse of the bridge, causing irreversible impacts. Given that a large number of bridges built in the early days can no longer meet the actual needs of current traffic operations, it is urgent to carry out corresponding renovation work on them. Summary of the invention

[0003] The embodiment of the present application provides a concrete bridge deck reinforcement structure and a construction method thereof to solve the problem in the related art that the safety and stability of the bridge deck are reduced due to various stresses caused by traffic loads on the existing bridge deck.

[0004] In a first aspect, a concrete bridge deck reinforcement structure is provided, comprising: an original concrete bridge deck and a pavement layer arranged on top thereof, wherein the original concrete bridge deck and the pavement layer are both provided with a steel bar layer, the original concrete bridge deck is provided with a plurality of connecting steel bar slots along the transverse direction of the bridge, the steel bar layer in the original concrete bridge deck is penetrated with a plurality of the connecting steel bar slots, the connecting steel bars are arranged in the connecting steel bar slots, and the connecting steel bars are used to connect the original concrete bridge deck and the steel bar layer in the pavement layer;

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

[0006] In some embodiments, the steel bar layer includes at least transverse steel bars, the upper ends of the connecting steel bars are connected to the transverse steel bars of the pavement layer, and the lower ends of the connecting steel bars are connected to the original concrete transverse bridge steel bars.

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

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

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

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

[0011] In some embodiments, hooks are provided at both ends of the connecting steel bars, the hook angle is 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] In a second aspect, a construction method for a concrete bridge deck reinforcement structure is provided, comprising the following steps:

[0014] Bridge deck pretreatment: After removing the original bridge asphalt pavement layer, roughen the original bridge concrete surface;

[0015] Grooving: Locate and mark the position of the newly added prestressed reinforcement, use hydraulic cutting equipment or other suitable cutting tools to open prestressed grooves on the original concrete bridge deck, and chisel the connecting reinforcement grooves according to the position of the connecting reinforcement, with a depth sufficient for the grooves to pass through the bottom of the transverse reinforcement of the bridge deck;

[0016] Reinforcement arrangement: Place prestressed tendons in the prestressed grooves, arrange the longitudinal and transverse reinforcement layers in the pavement layer, arrange the connecting reinforcement, and connect the original concrete transverse reinforcement with the transverse reinforcement of the pavement layer;

[0017] Concrete pouring: Set up partition formwork, pour lightweight ultra-high performance concrete for the pavement layer in batches, and wait until the concrete of the pavement layer reaches a certain strength through curing;

[0018] Tensioning: Prestressed tendons are tensioned to the designed strength values ​​in sequence according to the design requirements, and then the anchors at the tensioning ends are closed to complete the tensioning.

[0019] In some embodiments, the slotting step further includes excavating a prestressed tendon anchor block slot on the concrete bridge deck along the direction of the bridge;

[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 a nut on 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 close the fixed end.

[0022] The embodiment of the present application provides a concrete bridge deck reinforcement structure and a construction method thereof. Since a pavement layer is arranged on the original concrete bridge deck, connecting steel bar grooves are arranged on the original concrete bridge deck and connecting steel bars are placed to connect the original concrete bridge deck and the steel bar layer in the pavement layer, and at the same time, prestress is applied between the pavement layer and the original bridge top plate, which can effectively transfer and disperse the load, increase the overall stiffness of the structure, thereby enhancing the bearing capacity of the bridge deck, and can reduce the relative displacement and crack generation between the pavement layer and the original concrete bridge deck, enhance the integrity and coordinated force performance between the new and old concrete structures, so that the reinforced bridge deck can better withstand external forces such as vehicle loads, improve the safety and stability of the overall bridge structure, and extend the service life of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic plan view of a concrete bridge deck reinforcement structure provided in an embodiment of the present 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 the present application.

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

[0027] In the figure: 1. Original concrete bridge deck; 2. Pavement layer; 3. Connecting steel bar slots; 4. Connecting steel bars; 5. Transverse steel bars of the pavement layer; 6. Original concrete transverse steel bars; 7. Prestressed grooves; 8. Prestressed tendons; 9. Prestressed tendon anchor blocks. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] The embodiment of the present application provides a concrete bridge deck reinforcement structure to solve the problem in the related art that the safety and stability of the bridge deck are reduced due to various stresses caused by traffic loads on the existing bridge deck.

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

[0031] The original concrete bridge deck 1 and the pavement layer 2 are both provided with a steel bar layer. The original concrete bridge deck 1 is provided with a plurality of connecting steel bar slots 3 along the transverse direction of the bridge. The steel bar layer in the original concrete bridge deck 1 is provided with a plurality of connecting steel bar slots 3. Connecting steel bars 4 are provided in the connecting steel bar slots 3. The connecting steel bars 4 are arranged at intervals along the prestressed bars 8. The connecting steel bars 4 between two adjacent prestressed bars 8 are arranged in a staggered manner, which helps to optimize the force distribution of the bridge during the stress process and reduce the risk of stress concentration and local damage. Both ends of the connecting steel bar 4 are set as 90° hooks, and the diameter of the hooks is larger than the diameter of the connected steel bar to ensure the connection effect. The connecting steel bar 4 is used to connect the original concrete bridge deck 1 and the steel bar layer in the pavement layer 2 to prevent the pavement layer 2 and the original concrete bridge deck 1 from being separated.

[0032] The steel bar layer includes transverse steel bars and longitudinal steel bars. As ordinary steel bars are easy to rust and have heavy weight, glass fiber bars are preferred. The tensile strength of glass fiber bars is ≥800MPa, the elastic modulus is ≥45GPa, and the bulk density is about 2000kg / m 3 , much lower than the common steel bar density of 7850kg / m 3The 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 original concrete transverse bridge steel bar 6. The connecting steel bar 4 hooks the transverse steel bars in the original concrete bridge deck 1 and the transverse steel bars 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, and can form a tighter and more stable connection, reduce the relative displacement and cracks between the pavement layer 2 and the original concrete bridge deck 1, thereby enhancing the durability of the bridge.

[0033] In order to prevent the prestressed tendons 8 from causing the pavement layer 2 to be detached, 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 prestressed tendons 8, prestressed grooves 7 are excavated on the original concrete bridge deck 1 along the transverse direction of the bridge to place the prestressed tendons 8. The prestressed 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 prestressed tendons 8. The prestressed tendons 8 are arranged inside the grooves of the original concrete bridge deck 1, which are non-bonded prestressed tendons and are tensioned after the concrete pavement layer 2 is cured and formed. While setting the hooking steel bars 4, prestress is applied between the pavement layer 2 and the original concrete bridge deck 1 to enhance the structural bending stiffness, so that the bridge structure as a whole is subjected to stress together, thereby improving the durability of the structure and driving safety.

[0034] The prestressed tendon 8, including a tensioning end and a fixed end, includes a steel pad, a nut, a threaded steel sleeve, and a spiral tendon. After tensioning, the prestressed tendon 8 is tightened with the nut to maintain the set pre-tension value.

[0035] The tensioning end is set at the end of the original concrete bridge deck 1. After the tensioning is completed by the jack, the tensioning end is sealed in the form of an anchor to avoid contact with the outside world; or an anchor protection cover is installed to isolate it from the external environment and avoid corrosion.

[0036] The fixed end is set at the central dividing strip of the original concrete bridge deck 1. In order to better anchor the fixed end, a prestressed tendon anchor block 9 is set on the bridge deck, including the upper part and the lower part of the bridge deck. Specifically, a long groove for the prestressed tendon anchor block 9 is excavated along the bridge direction on the original concrete bridge deck 1, and the upper part height of the prestressed tendon anchor block 9 is about twice the lower part height. The anchor end of the prestressed tendon 8 is arranged in the long groove, and the prestressed tendon anchor block 9 is cast together with the concrete of the pavement layer 2 to form an anchor end.

[0037] A construction method for a concrete bridge deck reinforcement structure comprises the following steps:

[0038] Use tools and equipment to remove the original bridge asphalt pavement layer and then roughen the original bridge concrete surface 1, so that the original bridge concrete 1 and the pavement layer 2 can be better combined together and enhance the integrity of the two;

[0039] 9 grooves for prestressed tendon anchor blocks are excavated along the direction of the bridge on the concrete bridge deck;

[0040] According to the position of the newly added prestressed tendons 8, the positioning and marking are performed with a spacing of 30cm to 60cm. The prestressed grooves 7 are opened in the original concrete bridge deck 1 using hydraulic cutting equipment, and the width and depth of the grooves are controlled to avoid protruding stones in the grooves that affect the linear shape of the prestressed tendons 8;

[0041] According to the position of the hooking steel bar 4, a certain size of hooking steel bar slot 3 is chiseled to expose the original concrete transverse bridge steel bar 6. The chiseling depth is required to meet the hooking steel bar 4 passing through the bottom of the transverse steel bar of the bridge deck. The hooking steel bar slot 3 should not be opened at the place where the longitudinal and transverse steel bars are connected, preferably between the longitudinal steel bars;

[0042] The prestressed tendons 8 are placed in the prestressed grooves 7, and the fixed ends are placed in the grooves of the prestressed tendon anchor blocks 9 which are chiseled out;

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

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

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

[0046] After the concrete of the pavement layer 2 has reached a certain strength, the prestressed tendons 8 are tensioned in sequence to the design strength value according to the design requirements. Then the tensioning end anchor is closed to complete the tensioning;

[0047] Finally, a layer of asphalt crushed stone layer can be laid on the top of the pavement layer 2 as needed.

[0048] The present invention provides a concrete bridge deck reinforcement structure and a construction method thereof, wherein lightweight ultra-high performance concrete is used as the cover surface, and connecting steel bars are arranged between the original concrete bridge deck and the new pavement layer. At the same time, prestress is applied between the pavement layer and the original bridge top plate to enhance the bending rigidity of the concrete slab structure, so that the entire bridge structure is subjected to stress together, thereby improving the durability of the structure and driving safety.

[0049] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present 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 only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0051] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A concrete bridge deck reinforcement structure, characterized in that: It comprises: an original concrete bridge deck (1) and a pavement layer (2) arranged on the top thereof, wherein the original concrete bridge deck (1) and the pavement layer (2) are both provided with a steel bar layer, the original concrete bridge deck (1) is provided with a plurality of connecting steel bar slots (3) along the transverse direction of the bridge, the steel bar layer in the original concrete bridge deck (1) is penetrated by a plurality of the connecting steel bar slots (3), the connecting steel bars (4) are arranged in the connecting steel bar slots (3), and the connecting steel bars (4) are used to connect the original concrete bridge deck (1) and the steel bar layer in the pavement layer (2); Prestressed grooves (7) are arranged at equal intervals along the longitudinal direction of the bridge, and the prestressed grooves (7) are arranged along the transverse direction of the bridge. A set of prestressed tendons (8) are placed in the prestressed grooves (7).

2. The concrete bridge deck reinforcement structure according to claim 1, characterized in that: The steel bar layer comprises at least transverse steel bars, the upper ends of the connecting steel bars (4) are connected to the transverse steel bars (5) of the pavement layer, and the lower ends of the connecting steel bars (4) are connected to the original concrete transverse bridge steel bars (6).

3. The concrete bridge deck reinforcement structure according to claim 1, characterized in that: The original concrete bridge deck (1) is provided with a prestressed tendon anchor block (9) along the bridge direction; the prestressed tendon (8) comprises a tensioning end and a fixed end; the tensioning end is fixed to the end of the bridge deck, and the fixed end is fixed in the prestressed tendon anchor block (9).

4. The concrete bridge deck reinforcement structure according to claim 3, characterized in that: The prestressed tendon anchor block (9) comprises a portion located above the original concrete bridge deck (1) and a portion located below the original concrete bridge deck, and the ratio of the upper height to the lower height of the prestressed tendon anchor block (9) is 1.5 to 2.

5.

5. The concrete bridge deck reinforcement structure according to claim 1, characterized in that: Adjacent connecting steel bar slots (3) are arranged in a staggered manner along the bridge direction.

6. The concrete bridge deck reinforcement structure according to claim 1, characterized in that: Hooks are arranged at both ends of the connecting steel bar (4), the hook angle is between 90 degrees and 135 degrees, and the hook diameter is larger than the diameter of the connected steel bar.

7. The concrete bridge deck reinforcement structure according to claim 1, characterized in that: The material of the pavement layer is lightweight ultra-high performance concrete.

8. A construction method for a concrete bridge deck reinforcement structure according to any one of claims 1 to 7, characterized in that: The following steps are involved: Bridge deck pretreatment: After removing the original asphalt pavement layer of the bridge, the original concrete bridge deck (1) is roughened; Grooving: marking the position of the newly added prestressed reinforcement (8), using hydraulic cutting equipment or other suitable cutting tools to open the prestressed groove (7) in the original concrete bridge deck (1), and chiseling the connecting reinforcement groove (3) according to the position of the connecting reinforcement (4), with a depth sufficient for the connecting reinforcement to pass through the bottom of the transverse reinforcement of the bridge deck; Reinforcement arrangement: placing prestressed tendons (8) in the prestressed grooves (7), arranging longitudinal and transverse reinforcement layers in the pavement layer (2), arranging connecting reinforcements (4), and connecting the original concrete transverse reinforcements with the transverse reinforcements (5) of the pavement layer; Concrete pouring: setting up partition formwork, pouring the pavement layer (2) lightweight ultra-high performance concrete in batches, and waiting for the pavement layer (2) concrete to reach a certain strength after curing; Tensioning: Prestressed tendons (8) are tensioned sequentially to the designed strength value according to the design requirements, and then the anchors at the tensioning ends are closed to complete the tensioning.

9. The construction method of the concrete bridge deck reinforcement structure according to claim 8 is characterized by: The slotting step also includes excavating a prestressed tendon anchor block (9) slot on the concrete bridge deck along the direction of the bridge; 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 a nut on the tensioning end of the prestressed tendon (8) for pre-tightening.

10. The construction method of the concrete bridge deck reinforcement structure according to claim 9, characterized in that: During the concrete pouring step, the prestressed tendon anchor block (9) and the groove are poured together to seal the fixed end.

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