Bridge deck structure paved and reinforced by low-shrinkage ultra-high performance concrete

Abstract

The utility model relates to the technical field of bridge deck slab reinforcement and repair, and discloses a low-shrinkage ultra-high performance concrete pavement reinforced bridge deck structure which comprises a bridge deck slab, a reinforcement layer and anchoring parts. The reinforcing layer at least covers the upper surface and is formed by pouring ultra-high performance concrete with shrinkage strain smaller than 150 mu epsilon when the ultra-high performance concrete reaches a stable state, and the anchoring part is embedded between the bridge deck slab and the reinforcing layer. According to the utility model, the concave-convex textures enhance the interface friction force between the reinforcing layer and the bridge deck slab, so that the integrity of the bridge deck structure is stronger; the reinforcing layer poured by the low-shrinkage ultra-high performance concrete has better bearing capacity, rigidity and ductility; the connection firmness of the reinforcing layer and the bridge deck slab is improved through the anchoring parts; by means of the improvement, the bridge deck structure is not prone to interface void phenomena, cracks, voids, pitted surfaces and the like, the overall mechanical property of the bridge deck structure is effectively improved, and the service life of the bridge deck structure is effectively prolonged.

Description

Technical Field

[0001] This utility model relates to the field of bridge deck reinforcement and repair technology, and in particular to a bridge deck structure reinforced with low-shrinkage ultra-high performance concrete pavement. Background Technology

[0002] Existing reinforced concrete bridge decks are prone to damage due to long-term exposure to traffic loads, wind loads, temperature changes, corrosion, fatigue, and stress concentration.

[0003] Currently, the repair and reinforcement methods used for bridge deck damage include steel plate / FRP bonding reinforcement, external prestressing reinforcement, structural system modification reinforcement, cross-section enlargement reinforcement, and concrete reinforcement. Among these, concrete reinforcement involves removing the damaged portion of the bridge deck, either entirely or partially, and then re-pouring concrete. Compared to other methods, this is simpler to operate, but the overall mechanical properties of the reinforced bridge deck structure are relatively poor, making it prone to repeated damage and resulting in a shorter service life. Utility Model Content

[0004] This utility model discloses a bridge deck structure reinforced with low-shrinkage, ultra-high-performance concrete pavement, which solves the technical problems of poor mechanical properties and short service life of existing concrete-reinforced bridge deck structures.

[0005] This utility model provides a bridge deck structure reinforced with low-shrinkage ultra-high performance concrete pavement, including: bridge deck, reinforcement layer and anchorage;

[0006] The upper surface of the bridge deck is textured with raised and recessed patterns.

[0007] The reinforcement layer at least covers the upper surface and is made of ultra-high performance concrete with a shrinkage strain of less than 150 με when it reaches a stable state.

[0008] The anchor is embedded between the bridge deck and the reinforcement layer.

[0009] Optionally, the bump texture includes a chisel-textured texture.

[0010] Optionally, the textured surface includes a plurality of grooves;

[0011] The length direction of the groove is the same as the length direction of the bridge deck.

[0012] Optionally, the textured surface includes a plurality of grooves;

[0013] The length direction of the groove is the same as the width direction of the bridge deck.

[0014] Optionally, the anchor includes a plurality of U-shaped reinforcing bars and a plurality of straight reinforcing bars;

[0015] The ends of each of the U-shaped ribs are inserted into the bridge deck from the upper surface in the opposite direction to the outer normal of the upper surface;

[0016] The portion of the U-shaped rib not embedded in the bridge deck forms an enclosed space with the upper surface;

[0017] The multiple U-shaped ribs are divided into groups, and the U-shaped ribs in each group are arranged along the same straight line;

[0018] The same straight rib is inserted into each enclosed space of the same U-shaped rib group, and multiple straight ribs are arranged in parallel.

[0019] Optionally, the U-shaped reinforcing bar is an HRB 425 ribbed round steel bar with a diameter not exceeding 16mm;

[0020] The U-shaped ribs are embedded to a depth of 10mm to 20mm into the bridge deck, and the spacing between the U-shaped ribs in the same group is 20mm to 40mm.

[0021] Optionally, the anchor includes a reinforcing mesh.

[0022] The entire reinforcing mesh is implanted into the upper surface in the opposite direction to the outer normal of the upper surface, and the portion exposed outside the bridge deck is covered by the reinforcing layer.

[0023] Optionally, the reinforcing mesh is made of HRB 335 ribbed round steel bars with a diameter of less than 8 mm, bound or welded together.

[0024] Optionally, the ribs in the reinforcing mesh that have the same length direction as the bridge deck and are closest to the boundary of the bridge deck have a distance greater than 10mm from the boundary of the bridge deck.

[0025] Optionally, the thickness of the reinforcing layer is 30 mm to 45 mm.

[0026] As can be seen from the above technical solutions, this utility model has the following advantages:

[0027] This invention provides a bridge deck structure reinforced with low-shrinkage ultra-high performance concrete pavement, comprising a bridge deck, a reinforcement layer, and anchors. The upper surface of the bridge deck has a textured surface. The reinforcement layer covers at least the upper surface and is cast from ultra-high performance concrete with a shrinkage strain of less than 150 με when reaching a stable state. Anchors are embedded between the bridge deck and the reinforcement layer. In this invention, the textured surface enhances the interfacial friction between the reinforcement layer and the bridge deck, making the overall structure of the bridge deck stronger. The reinforcement layer, cast from low-shrinkage ultra-high performance concrete, has good load-bearing capacity, stiffness, and ductility. The anchors convert part of the frictional shear force at the interface between the reinforcement layer and the bridge deck into shear bending moment, improving the connection strength between the reinforcement layer and the bridge deck. These improvements make the bridge deck structure provided by this invention less prone to interfacial delamination, cracks, honeycomb pitting, and other problems, effectively improving the overall mechanical properties and service life of the bridge deck structure. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a bridge deck structure reinforced with low-shrinkage ultra-high performance concrete pavement, provided by an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of a bridge deck structure reinforced with low-shrinkage ultra-high performance concrete pavement, provided by an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of a bridge deck structure reinforced with low-shrinkage ultra-high performance concrete pavement, provided by an embodiment of the present invention.

[0032] Figure 4 This is a structural diagram of the bridge deck without reinforcement.

[0033] Reference numerals: 1-Bridge deck; 2-Scuffed texture; 3-Longitudinal groove; 4-Transverse groove; 5-U-shaped rib; 6-Straight rib; 7-Rib mesh; 8-Reinforcing layer. Detailed Implementation

[0034] This utility model discloses a bridge deck structure reinforced with low-shrinkage, ultra-high-performance concrete pavement, which solves the technical problems of poor mechanical properties and short service life of existing concrete-reinforced bridge deck structures.

[0035] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. "A plurality" refers to two or more. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] Please see Figures 1 to 3 The present invention provides a bridge deck structure reinforced with low-shrinkage ultra-high performance concrete pavement, comprising: a bridge deck 1, a reinforcement layer 8, and anchors.

[0039] The upper surface of the bridge deck 1 is textured with raised and recessed patterns;

[0040] The reinforcement layer 8 covers at least the upper surface of the bridge deck 1 and is made of ultra-high performance concrete with a shrinkage strain of less than 150 με when it reaches a stable state.

[0041] The anchor is embedded between the bridge deck 1 and the reinforcement layer 8.

[0042] It is understandable that bridge deck 1 refers to the original old concrete layer of the bridge deck that is being reinforced and repaired; the upper surface of bridge deck 1 is the side of the bridge that directly bears external loads such as vehicles and pedestrians, and is prone to wear, cracks, potholes and other problems after long-term use, so it needs to be reinforced and repaired; if there are also damaged parts on other surfaces of bridge deck 1, the reinforcement layer 8 should also be covered.

[0043] Anchors can be rigid components such as reinforcing bars, anchor rods, or reinforcing mesh. Specifically, the anchors can be partially embedded from the upper surface of the reinforcement layer 1 into the bridge deck 1, and partially exposed on the upper surface of the bridge deck 1 and encased by the cast reinforcement layer 8. This converts part of the frictional shear force at the interface between the reinforcement layer 8 and the bridge deck 1 into shear bending moment for the anchors. In a preferred embodiment of this invention, please refer to... Figure 1 or Figure 2 The anchor includes multiple U-shaped ribs 5 and multiple straight ribs 6; the ends of each U-shaped rib 5 are inserted into the bridge deck 1 from the upper surface of the bridge deck 1 in the opposite direction to the outer normal of the upper surface of the bridge deck 1, and the part of the U-shaped rib 5 not inserted into the bridge deck 1 forms an enclosed space with the upper surface of the bridge deck 1; the multiple U-shaped ribs 5 are divided into groups, and the U-shaped ribs 5 in each group are arranged along the same straight line; the straight ribs 6 are ribs with a certain length and a shape close to a straight line, and the same straight rib 6 passes through each enclosed space of the same group of U-shaped ribs 5, and multiple straight ribs 6 are arranged in the same direction. The reinforcing bars 6 are arranged in parallel. In this preferred embodiment, the U-shaped reinforcing bars 5 can restrict the movement of the straight reinforcing bars 6 in the direction perpendicular to the length direction of the straight reinforcing bars 6. The cooperation between the U-shaped reinforcing bars 5 and the straight reinforcing bars 6 can improve the shear resistance of the interface between the reinforcement layer 8 and the bridge deck 1 in the direction perpendicular to the length direction of the straight reinforcing bars 6. The depth of the U-shaped reinforcing bars 5 embedded in the bridge deck 1 is preferably 10mm to 20mm, and the spacing between the U-shaped reinforcing bars 5 in the same group is preferably 20mm to 40mm. The U-shaped reinforcing bars 5 can be selected from HRB 400 ribbed round steel bars with a diameter of less than 10mm, and the straight reinforcing bars 6 can be selected from HRB 400 threaded bending round steel bars with a diameter of less than 16mm. In another preferred embodiment of this embodiment, the anchor includes a single layer of reinforcing mesh 7 (such as...) embedded in the upper surface of the bridge deck 1. Figure 3 As shown), the reinforcing mesh is implanted along the opposite direction of the outer normal of the upper surface of the bridge deck 1, and the part exposed outside the bridge deck 1 is covered by the cast-in-place reinforcement layer 8. The reinforcing mesh is made of multiple reinforcing bars tied or welded together, preferably a reinforcing mesh made of HRB 335 ribbed round steel bars with a diameter of less than 8mm tied or welded together. The distance between adjacent reinforcing bars is preferably 10mm to 50mm. The distance between the reinforcing bar in the reinforcing mesh that is in the same length direction as the bridge deck 1 and is closest to the boundary of the bridge deck 1 should be greater than 10mm. FRP bars can also be used to tie or weld together to form a reinforcing mesh to reduce costs.

[0044] The reinforcing layer 8 is cast from any type of ultra-high performance concrete with a shrinkage strain of less than 150 με when reaching a stable state. Those skilled in the art can choose the appropriate type based on actual needs and cost. The thickness of the reinforcing layer 8 is 30 mm to 45 mm. If ultra-high performance concrete containing steel fibers is selected, the thickness of the reinforcing layer 8 is preferably 30 mm to 40 mm. A suitable thickness allows for a higher packing density of steel fibers in the reinforcing layer 8, thereby improving the mechanical properties of the reinforcing layer 8 to a certain extent. In one specific embodiment of this invention, the raw materials for an ultra-high performance concrete with a shrinkage strain of less than 150 με when reaching a stable state, by mass percentage, may include: 500-700 parts silicate cement, 90-120 parts fly ash, 140-180 parts silica fume, and 90 parts silica sand. The mixture consists of 0-1300 parts of water, 180-230 parts of water-reducing agent, 10-25 parts of expansion agent, 80-100 parts of shrinkage agent, 10-25 parts of internal curing agent (preferably high-performance water-absorbing resin), and 110-190 parts of steel fiber. The mixing time for the powder (silicate cement, fly ash, silica fume, and internal curing agent) should be no less than 3 minutes. The mixing time after adding aggregate (quartz sand) should be no less than 2 minutes. The mixing time after adding water-reducing agent, expansion agent, shrinkage agent, and water should be no less than 3 minutes. The mixing time after adding steel fiber should be no less than 1 minute. Specifically, after embedding anchors in bridge deck 1, the upper surface of bridge deck 1 and other damaged surfaces should be poured after formwork erection. Curing and demolding should then be carried out. The curing method can be steam curing for 7 days or natural curing for 2 days.

[0045] The raised texture is a textured structure formed after removing a portion of the concrete from the upper surface of the bridge deck 1. It can be obtained by treating the upper surface of the bridge deck 1 using methods such as grooving, roughening, and chemical etching. Grooving refers to creating regular grooves on the upper surface of the bridge deck 1. In this invention, the raised texture obtained by grooving is preferably a combination of multiple parallel grooves, such as... Figure 1 The longitudinal groove 3 and Figure 2 The transverse groove 4 in the middle; the distance between adjacent grooves is preferably 150mm to 300mm; the groove cross-section perpendicular to the groove length direction is preferably trapezoidal, the groove surface width is preferably 100mm to 200mm, and the groove bottom width is preferably 50mm to 100mm; if the anchor is selected as such Figure 1 Alternatively, as shown in Figure 2, the combination of U-shaped ribs 5 and straight ribs 6 is preferred, with the length direction of the groove perpendicular to the length direction of the straight ribs 6, ensuring that the interface between the bridge deck 1 and the reinforcing layer 8 possesses a certain shear resistance in different directions. Roughening involves removing a portion of the upper surface of the bridge deck 1, creating an irregular textured surface, for example... Figure 3The roughened texture 2 is shown covering the upper surface of the bridge deck 1. The depth of the roughened texture 2 should be less than 20mm. When the bridge deck is severely damaged, only the severely damaged parts are roughened to a depth greater than 20mm. After the part is roughened, a short round steel bar can be inserted at this location. Chemical etching involves using a specific chemical solution to remove part of the concrete on the upper surface of the bridge deck 1 through a chemical reaction.

[0046] Ultra-high performance concrete (UHPC) is a new type of cement-based material with good strength, toughness, and durability, which can improve the load-bearing capacity, stiffness, and ductility of bridge deck structures to a certain extent. However, if UHPC is used to replace ordinary concrete, and the damaged parts of the bridge deck are completely or partially removed before pouring UHPC, the bonding between the UHPC and the original ordinary concrete of the bridge deck is insufficient. During the solidification process, interface delamination is likely to occur between the UHPC and the bridge deck, which can lead to problems such as cracks and honeycomb pitting in the reinforcement layer. Furthermore, when vehicles drive on the surface of the reinforced bridge deck structure, the frictional force at the interface between the concrete layer and the bridge deck acts as a reaction force to resist the dynamic load of the vehicle. If the dynamic load of the vehicle exceeds the peak frictional force, lateral displacement of the interface may occur. The interface delamination between the concrete layer and the bridge deck will result in insufficient shear resistance and low frictional force. Therefore, simply replacing ordinary concrete with UHPC cannot significantly improve the overall mechanical properties and service life of the reinforced bridge deck structure.

[0047] Therefore, in this embodiment, a textured surface is created on the upper surface of the bridge deck 1 to increase the contact area between the ultra-high performance concrete of the reinforcing layer 8 and the bridge deck 1, thereby enhancing the interfacial friction between the reinforcing layer 8 and the bridge deck 1 and making the overall structure of the bridge deck stronger. The reinforcing layer 8 is made of low-shrinkage ultra-high performance concrete, which has good load-bearing capacity, stiffness, and ductility while having a low shrinkage rate. Furthermore, anchors are embedded between the bridge deck 1 and the reinforcing layer 8, converting part of the frictional shear force at the interface between the reinforcing layer 8 and the bridge deck 1 into shear bending moment of the anchors, improving the connection strength between the reinforcing layer 8 and the bridge deck 1. The reinforcing layer 8 of the bridge deck structure provided in this embodiment has good mechanical properties, and the bond between the reinforcing layer 8 and the bridge deck 1 is good, making it less prone to interfacial delamination, cracks, honeycomb pitting, and other problems, effectively improving the overall mechanical properties and service life of the bridge deck structure.

[0048] Please see Figure 1 The present invention provides a bridge deck structure reinforced with low-shrinkage ultra-high performance concrete pavement according to Embodiment 2, which includes a bridge deck 1, a reinforcement layer 8 and anchors.

[0049] The upper surface of the bridge deck 1 is provided with a plurality of longitudinal grooves 3, the length direction of the longitudinal grooves 3 is the same as the length direction of the bridge deck 1; the cross section of the longitudinal grooves 3 perpendicular to the length direction of the longitudinal grooves 3 is trapezoidal.

[0050] The reinforcement layer 8 covers at least the upper surface of the bridge deck 1 and is made of ultra-high performance concrete with a shrinkage strain of less than 150 με when it reaches a stable state.

[0051] The anchor includes multiple U-shaped reinforcing bars 5 and multiple straight reinforcing bars 6;

[0052] The U-shaped ribs 5 are partially inserted into the bridge deck 1, and the remaining part is wrapped by the cast reinforcement layer 8. The straight ribs 6 are completely wrapped by the cast reinforcement layer 8. Specifically, the ends of each U-shaped rib 5 are inserted into the bridge deck 1 from the upper surface of the bridge deck 1 in the opposite direction to the outer normal of the upper surface of the bridge deck 1. The part of the U-shaped rib 5 that is not inserted into the bridge deck 1 forms an enclosed space with the upper surface of the bridge deck 1.

[0053] Multiple U-shaped reinforcing bars 5 are divided into groups, and the U-shaped reinforcing bars 5 in each group are arranged along the same straight line;

[0054] The same straight rib 6 is inserted into each enclosed space of the same group of U-shaped ribs 5, and multiple straight ribs 6 are arranged in parallel. The length direction of the straight rib 6 is perpendicular to the length direction of the longitudinal groove 3.

[0055] The bridge deck structure provided in this embodiment is suitable for situations where the original bridge deck damage is elongated and has many secondary cracks. The longitudinal groove 3 can cover a large area of ​​the damaged parts in this case. In this embodiment, the longitudinal groove 3 improves the shear resistance of the interface between the bridge deck 1 and the reinforcement layer 8 in the width direction of the bridge deck 1, while the U-shaped ribs 5 and straight ribs 6 improve the shear resistance of the interface between the bridge deck 1 and the reinforcement layer 8 in the length direction of the bridge deck 1.

[0056] In actual construction, the bridge deck 1 can be surface-treated first, and the damaged parts can be removed. Then, longitudinal grooves 3 can be engraved on the upper surface. Next, each U-shaped reinforcing bar 5 can be inserted into the upper surface of the bridge deck 1, and the straight reinforcing bars 6 can be inserted into the corresponding enclosed spaces. Finally, formwork can be erected to pour low-shrinkage ultra-high performance concrete into the bridge deck 1, and the formwork can be cured and then removed. After the above steps are completed, the reinforcement layer 8 is combined with the bridge deck 1 to form a complete bridge deck structure. The low-shrinkage ultra-high performance concrete used in this embodiment is composed of 618 parts by weight of silicate cement, 101 parts of fly ash, 152 parts of silica fume, 1202 parts of quartz sand, 194 parts of water, 18 parts of water-reducing agent, 89 parts of expansion agent, 14 parts of shrinkage-reducing agent, 20 parts of internal curing agent, and 170 parts of steel fiber.

[0057] Please see Figure 2The present invention provides a bridge deck structure reinforced with low-shrinkage ultra-high performance concrete pavement in embodiment three, comprising a bridge deck 1, a reinforcement layer 8 and anchors.

[0058] The upper surface of the bridge deck 1 is provided with multiple transverse grooves 4, the length direction of the transverse grooves 4 is the same as the width direction of the bridge deck 1; the cross section of the transverse grooves 4 perpendicular to the length direction of the transverse grooves 4 is trapezoidal.

[0059] The reinforcement layer 8 covers at least the upper surface of the bridge deck 1 and is made of ultra-high performance concrete with a shrinkage strain of less than 150 με when it reaches a stable state.

[0060] The anchor includes multiple U-shaped reinforcing bars 5 and multiple straight reinforcing bars 6;

[0061] The U-shaped ribs 5 are partially inserted into the bridge deck 1, and the remaining part is wrapped by the cast reinforcement layer 8. The straight ribs 6 are completely wrapped by the cast reinforcement layer 8. Specifically, the ends of each U-shaped rib 5 are inserted into the bridge deck 1 from the upper surface of the bridge deck 1 in the opposite direction to the outer normal of the upper surface of the bridge deck 1. The part of the U-shaped rib 5 that is not inserted into the bridge deck 1 forms an enclosed space with the upper surface of the bridge deck 1.

[0062] Multiple U-shaped reinforcing bars 5 are divided into groups, and the U-shaped reinforcing bars 5 in each group are arranged along the same straight line;

[0063] The same straight rib 6 is inserted into each enclosed space of the same group of U-shaped ribs 5, and multiple straight ribs 6 are arranged in parallel. The length direction of the straight rib 6 is perpendicular to the length direction of the transverse groove 4.

[0064] The bridge deck structure provided in this embodiment is suitable for situations where the original bridge deck has many defects such as circular or irregular potholes. The transverse groove 4 can cover a large area of ​​the damaged parts in this case. In this embodiment, the transverse groove 4 improves the shear resistance of the interface between the bridge deck 1 and the reinforcement layer 8 in the length direction of the bridge deck 1, while the U-shaped ribs 5 and straight ribs 6 improve the shear resistance of the interface between the bridge deck 1 and the reinforcement layer 8 in the width direction of the bridge deck 1.

[0065] In actual construction, the bridge deck 1 can be surface-treated first, and the damaged parts can be removed. Then, transverse grooves 4 can be engraved on the upper surface. Next, each U-shaped reinforcing bar 5 can be inserted into the upper surface of the bridge deck 1, and the straight reinforcing bars 6 can be inserted into the corresponding enclosed spaces. Finally, formwork can be erected to pour low-shrinkage ultra-high performance concrete into the bridge deck 1, and the formwork can be cured and then removed. After completing the above steps, the reinforcement layer 8 is combined with the bridge deck 1 to form a complete bridge deck structure. The low-shrinkage ultra-high performance concrete used in this embodiment consists of 558 parts by weight of silicate cement, 97 parts of fly ash, 149 parts of silica fume, 996 parts of quartz sand, 220 parts of water, 17 parts of water-reducing agent, 94 parts of expansion agent, 16 parts of shrinkage-reducing agent, 15 parts of internal curing agent, and 128 parts of steel fiber.

[0066] Please see Figure 3 The present invention provides a bridge deck structure reinforced with low-shrinkage ultra-high performance concrete pavement in embodiment four, comprising: bridge deck 1, reinforcement layer 8 and anchors.

[0067] The upper surface of the bridge deck 1 is provided with a chisel-textured pattern 2;

[0068] The reinforcement layer 8 covers at least the upper surface of the bridge deck 1 and is made of ultra-high performance concrete with a shrinkage strain of less than 150 με when it reaches a stable state.

[0069] The anchor includes a reinforcing mesh 7 embedded in the upper surface of the bridge deck 1. The entire reinforcing mesh 7 is embedded in the upper surface of the bridge deck 1 in the opposite direction to the outer normal of the upper surface of the bridge deck 1, and the part exposed outside the bridge deck 1 is wrapped by the cast reinforcement layer 8.

[0070] The depth of the roughening texture 2 is determined by the degree of damage to the original bridge surface. When the depth does not exceed 20mm, the entire surface is removed. Correspondingly, the depth of the roughening texture 2 does not exceed 20mm. For the original bridge surface with a large area of ​​damage and severe local damage, only the severely damaged parts are removed with a depth greater than 20mm. After removing this part, a short round steel bar can be inserted separately at this location. The roughening texture is applied to the remaining parts.

[0071] In actual construction, the bridge deck 1 can be surface-treated first, with damaged parts removed, and then the surface to be repaired roughened. Next, the reinforcing mesh 7 is implanted into the upper surface of the bridge deck 1. Finally, formwork is erected, and low-shrinkage ultra-high performance concrete is poured, cured, and then the formwork is removed. After completing the above steps, the reinforcement layer 8 is combined with the bridge deck 1 to form a complete bridge deck structure. In this embodiment, the low-shrinkage ultra-high performance concrete used, by weight, consists of 580 parts silicate cement, 97 parts fly ash, 167 parts silica fume, 1160 parts quartz sand, 196 parts water, 17 parts water-reducing agent, 92 parts expansion agent, 16 parts shrinkage-reducing agent, 15 parts internal curing agent, and 144 parts steel fiber.

[0072] It should be noted that the ultra-high performance concrete raw material formula, preparation method, pouring method, curing method, specific processing method and actual construction steps for different textures in the above embodiments are only examples for explanation and reference by those skilled in the art, and are not innovations of this application. Those skilled in the art can obtain, select, adjust and implement this part based on common knowledge, and it does not mean that the protection content of the bridge deck structure provided by this utility model involves this part.

[0073] The above provides a detailed description of a bridge deck structure reinforced with low-shrinkage, ultra-high-performance concrete pavement provided by this utility model. For those skilled in the art, based on the ideas of the embodiments of this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A bridge deck structure reinforced with low-shrinkage, ultra-high-performance concrete pavement, characterized in that, include: Bridge deck, reinforcement layer and anchorage; The upper surface of the bridge deck is textured with raised and recessed patterns. The reinforcement layer at least covers the upper surface and is made of ultra-high performance concrete with a shrinkage strain of less than 150 με when it reaches a stable state. The anchor is embedded between the bridge deck and the reinforcement layer.

2. The bridge deck structure according to claim 1, characterized in that, The raised texture includes a chisel-textured texture.

3. The bridge deck structure according to claim 1, characterized in that, The textured surface includes multiple grooves; The length direction of the groove is the same as the length direction of the bridge deck.

4. The bridge deck structure according to claim 1, characterized in that, The textured surface includes multiple grooves; The length direction of the groove is the same as the width direction of the bridge deck.

5. The bridge deck structure according to claim 2, 3 or 4, characterized in that, The anchor includes multiple U-shaped reinforcing bars and multiple straight reinforcing bars; The ends of each of the U-shaped ribs are inserted into the bridge deck from the upper surface in the opposite direction to the outer normal of the upper surface; The portion of the U-shaped rib not embedded in the bridge deck forms an enclosed space with the upper surface; The multiple U-shaped ribs are divided into groups, and the U-shaped ribs in each group are arranged along the same straight line; The same straight rib is inserted into each enclosed space of the same U-shaped rib group, and multiple straight ribs are arranged in parallel.

6. The bridge deck structure according to claim 5, characterized in that, The U-shaped reinforcing bars are HRB425 ribbed round steel bars with a diameter not exceeding 16mm; The U-shaped ribs are embedded to a depth of 10mm to 20mm into the bridge deck, and the spacing between the U-shaped ribs in the same group is 20mm to 40mm.

7. The bridge deck structure according to claim 2, 3 or 4, characterized in that, The anchor includes reinforcing mesh; The entire reinforcing mesh is implanted into the upper surface in the opposite direction to the outer normal of the upper surface, and the portion exposed outside the bridge deck is covered by the reinforcing layer.

8. The bridge deck structure according to claim 7, characterized in that, The reinforcing mesh is made of HRB335 ribbed round steel bars with a diameter of less than 8mm, which are tied or welded together.

9. The bridge deck structure according to claim 7, characterized in that, The ribs in the reinforcing mesh that are in the same length direction as the bridge deck and are closest to the boundary of the bridge deck have a distance greater than 10mm from the boundary of the bridge deck.

10. The bridge deck structure according to claim 1, characterized in that, The thickness of the reinforcement layer is 30mm to 45mm.

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