Fabricated full-FRP bridge deck structure and construction method therefor

Abstract

A fabricated full-FRP bridge deck structure, comprising a bearing box girder (1) and bridge decks (2), wherein the bearing box girder (1) comprises a box girder concrete portion (11) and a box girder reinforcing mesh made of an FRP material, and each bridge deck (2) comprises a deck concrete portion (21) and a deck reinforcing mesh made of the FRP material; a plurality of FRP connectors (24) are arranged at each edge portion of each bridge deck (2), outer major end portions (243) of the FRP connectors (24) respectively extend into corresponding side joints, and two aligned FRP connectors (24) are connected by means of an FRP strip fabric (3); and a joint between two bridge decks (2) forms a cast-in-place ECC wet joint (4) by pouring an ECC high-toughness fiber cement-based composite material. Further provided is a construction method for a fabricated full-FRP bridge deck structure. The fabricated full-FRP bridge deck structure has the advantages of a new design, good durability and a long service life.

Description

An assembled all-FRP bridge deck structure and its construction method Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to an assembled full FRP bridge deck structure and a construction method thereof. Background Art

[0002] The patent number is: ZL202223077832.2, and the patent name is: A Chinese invention patent for a prefabricated corrugated steel web composite beam bridge deck structure, which discloses the following technical solutions, specifically: a prefabricated corrugated steel web composite beam bridge deck structure, which includes a box beam body, a bridge deck assembly, and an open steel plate. The box beam body and the bridge deck assembly are prefabricated components. The box beam body includes a bottom plate, a corrugated steel web and a flange plate. The open steel plate is welded to the flange plate and is formed along the flange plate shape. The bridge deck extends in the longitudinal direction, and the open steel plate is provided with a plurality of U-shaped clips at equal intervals along its shape direction; the bridge deck assembly includes a plurality of bridge decks arranged at intervals, and a cast-in-place trough is left between two adjacent bridge decks, and the transverse steel bars inside the bridge deck extend into the cast-in-place trough and pass through the U-shaped clips of the open steel plate, and the concrete layer is poured in the cast-in-place trough; in addition, the bridge deck is provided with annular steel bars on the end face in the longitudinal direction of the bridge, and a wet joint is left between two adjacent bridge deck assemblies to pour the concrete layer, and the longitudinally arranged annular steel bars extend into the wet joint.

[0003] It should be pointed out that the above-mentioned assembled corrugated steel web composite beam bridge deck structure has the following defects. Specifically, since the assembled corrugated steel web composite beam bridge deck structure adopts a steel box beam body and a bridge deck with steel bars arranged inside, it is prone to rust. The rust of steel parts can easily lead to concrete cracking, decreased bonding performance between steel and concrete, degradation and failure of the service performance of the bridge structure, and other problems. In other words, it has the defects of poor durability and short service life. Summary of the Invention

[0004] The purpose of the present invention is to provide an assembled full FRP bridge deck structure in view of the deficiencies in the prior art, wherein the assembled full FRP bridge deck structure has a novel design, good durability and a long service life.

[0005] Another object of the present invention is to provide a construction method for an assembled all-FRP bridge deck structure to address the deficiencies of the prior art. The assembled all-FRP bridge deck structure constructed by this construction method has good durability and a long service life.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0007] An assembled all-FRP bridge deck structure includes a supporting box girder and a plurality of bridge decks sequentially spaced apart and paved on the upper surface of the supporting box girder, wherein the supporting box girder and the bridge decks are prefabricated components; a transverse joint extending laterally is provided between two adjacent longitudinally spaced bridge decks, and a longitudinal joint extending longitudinally is provided between two transversely spaced bridge decks;

[0008] The supporting box girder includes a box girder concrete portion and a box girder reinforcement mesh embedded in the box girder concrete portion. The box girder reinforcement mesh is composed of box girder longitudinal FRP bars and box girder FRP closed stirrups tied to the box girder longitudinal FRP bars.

[0009] Each bridge deck comprises a concrete panel portion and a panel reinforcement network embedded within the concrete panel portion. The panel reinforcement network is composed of longitudinal FRP bars extending longitudinally and transverse FRP bars bound to the longitudinal FRP bars and extending transversely. The ends of the longitudinal FRP bars and transverse FRP bars of each bridge deck extend into the corresponding longitudinal joints and transverse joints, respectively.

[0010] Each edge of the bridge deck is provided with a plurality of FRP connectors spaced apart along the corresponding edge. Each FRP connector comprises an intermediate rod, an inner large end portion provided at the inner end portion of the intermediate rod, and an outer large end portion provided at the outer end portion of the intermediate rod. The inner end portion and the inner large end portion of each FRP connector are respectively buried within the corresponding concrete portion of the deck, while the outer end portion and the outer large end portion of each FRP connector extend into the corresponding longitudinal joint and transverse joint, respectively. The outer large end portion of each FRP connector is provided with a lifting ring.

[0011] The FRP connectors in the longitudinal joints are aligned in the transverse direction. The two aligned FRP connectors are connected by an FRP strip cloth. The two ends of the FRP strip cloth are respectively connected to the lifting rings of the FRP connectors on the corresponding sides.

[0012] Each longitudinal joint and each transverse joint is respectively formed by pouring ECC high-toughness fiber cement-based composite materials to form a cast-in-place ECC wet joint.

[0013] Wherein, the side surfaces of each bridge deck are stepped surfaces, and each longitudinal joint and each transverse joint are in a tongue-and-groove shape;

[0014] Each vertical plane on the side of the bridge deck is respectively provided with an FRP connector, that is, each edge portion of the bridge deck is respectively provided with at least two layers of FRP connectors spaced apart from each other.

[0015] Wherein, each bridge deck comprises two panel reinforcement nets spaced apart from each other, the upper panel reinforcement net is located at the top of the corresponding panel concrete part, and the lower panel reinforcement net is located at the bottom of the corresponding panel concrete part.

[0016] Among them, two layers of joint FRP reinforcement meshes are buried in the interior of each cast-in-place ECC wet joint, and each joint FRP reinforcement mesh is composed of longitudinal joint FRP reinforcements extending longitudinally and transverse joint FRP reinforcements tied to the longitudinal joint FRP reinforcements and extending transversely.

[0017] Among them, the box girder FRP longitudinal reinforcement, the box girder FRP closed stirrups, the panel longitudinal FRP reinforcement, and the panel transverse FRP reinforcement are GFRP reinforcement, BFRP reinforcement or CFRP reinforcement, and the box girder FRP longitudinal reinforcement, box girder FRP closed stirrups, panel longitudinal FRP reinforcement, and panel transverse FRP reinforcement are required to have a tensile strength higher than 800 MPa and an elastic modulus higher than 50 GPa; the bending strength of the box girder FRP closed stirrups is higher than 50% of the ultimate tensile strength.

[0018] The FRP reinforcement ratio of the bridge deck is 0.6%-1%.

[0019] The FRP strip cloth is a CFRP strip cloth, and the tensile strength of the FRP strip cloth is higher than 3000 MPa and the elastic modulus is higher than 200 GPa.

[0020] The ECC high-toughness fiber cement-based composite material used to cast the cast-in-situ ECC wet joint contains PVA fibers, and the ECC high-toughness fiber cement-based composite material has a compressive strength of 50 MPa and a tensile strength of 6.5 MPa;

[0021] ECC high-toughness fiber cement-based composite material includes cement, fly ash, limestone powder, metakaolin, silica fume, water reducer, and PVA fiber with a length of 12 mm. The masses of cement, fly ash, limestone powder, metakaolin, silica fume, water, sand, water reducer, and PVA fiber in 1 m3 of ECC high-toughness fiber cement-based composite material are 552 kg, 690 kg, 55.2 kg, 55.2 kg, 27.6 kg, 358.8 kg, 496.8 kg, 138 kg, and 24 kg, respectively.

[0022] The supporting box girder and the bridge deck are respectively cast and formed by SCC self-compacting concrete with a compressive strength of 60 MPa; the SCC self-compacting concrete includes crushed stone with a particle size distribution between 4.5 mm and 20 mm, sand with a particle size distribution between 0.1 and 4.5 mm, fly ash, cement, limestone powder, water, and F10 water reducer. The masses of crushed stone, sand, fly ash, cement, limestone powder, water, and F10 water reducer in 1 m3 of SCC self-compacting concrete are 684.6 kg, 945.4 kg, 309.7 kg, 232.28 kg, 77.43 kg, 148.66 kg, and 0.124 kg, respectively.

[0023] A construction method for an assembled all-FRP bridge deck structure includes the following process steps, specifically:

[0024] Step S1, prefabricating the supporting box girder and bridge deck: the supporting box girder includes a box girder concrete portion and a box girder reinforcement mesh embedded in the box girder concrete portion, wherein the box girder reinforcement mesh is composed of box girder longitudinal FRP bars and box girder FRP closed stirrups bound to the box girder longitudinal FRP bars; the bridge deck includes a panel concrete portion and a panel reinforcement mesh embedded in the panel concrete portion, wherein the panel reinforcement mesh is composed of longitudinal panel FRP bars extending longitudinally and transverse panel FRP bars bound to the longitudinal panel FRP bars and extending transversely, wherein both ends of the longitudinal panel FRP bars and both ends of the transverse panel FRP bars extend out of the sides of the bridge deck respectively;

[0025] Each edge of the bridge deck is provided with a plurality of FRP connectors arranged in sequence along the corresponding edge. Each FRP connector includes an intermediate rod, an inner large end portion provided at the inner end portion of the intermediate rod, and an outer large end portion provided at the outer end portion of the intermediate rod. The inner end portion and the inner large end portion of the intermediate rod of the FRP connector are respectively buried within the concrete portion of the deck, while the outer end portion and the outer large end portion of the intermediate rod of the FRP connector extend out of the side of the bridge deck, and the outer large end portion of the FRP connector is provided with a lifting ring.

[0026] Step S2: transporting the prepared supporting box beam and bridge deck to the construction site, and paving a plurality of bridge decks on the upper surface of the supporting box beam;

[0027] Several bridge decks paved on the upper surface of the supporting box girder are arranged in sequence, with a transverse joint extending transversely provided between two adjacent longitudinally spaced bridge decks, and a longitudinal joint extending longitudinally provided between two transversely spaced bridge decks; both ends of the longitudinal FRP reinforcement of each bridge deck and both ends of the transverse FRP reinforcement of each bridge deck extend into the corresponding longitudinal joint and transverse joint respectively;

[0028] The outer end of the middle rod portion and the outer large end of each FRP connector are respectively extended into the corresponding longitudinal seam and transverse seam. The FRP connectors in the longitudinal seam are aligned transversely, and the FRP connectors in the transverse seam are aligned longitudinally.

[0029] Step S3: Formwork is provided at the bottom of the longitudinal and transverse seams, and joint FRP reinforcement mesh is laid at the longitudinal and transverse seams. Then, two aligned FRP connectors are connected by FRP strips. During this process, the two ends of the FRP strips are connected to the lifting rings of the FRP connectors on the corresponding sides to form FRP strip closed cables.

[0030] Step S4: pouring ECC high-toughness fiber cement-based composite materials into the longitudinal joints and transverse joints to form cast-in-place ECC wet joints, and removing the formwork after curing;

[0031] Step S5: constructing the pavement layer.

[0032] Compared with the prior art, the present invention has the following beneficial effects, specifically:

[0033] 1. The box girder reinforcement mesh, consisting of longitudinal FRP bars and closed FRP stirrups supporting the box girder, is made of FRP. The panel reinforcement mesh, consisting of longitudinal FRP bars and transverse FRP bars within the bridge deck, is also made of FRP. Compared to the existing steel reinforcement structures within box girders and bridge decks, this box girder reinforcement mesh and panel reinforcement mesh have the advantage of good corrosion resistance and can solve problems such as concrete cracking, structural performance degradation, and shortened service life caused by steel corrosion.

[0034] 2. Two adjacent bridge decks are connected by FRP connectors and FRP strips. Both are made of FRP materials, which have the advantage of good corrosion resistance. The two bridge decks are connected by FRP connectors and FRP strips, and the outer end of each FRP connector and FRP strip is located inside the cast-in-place ECC wet joint. This connection method can effectively improve the coordination and integrity of the bridge deck and cast-in-place ECC wet joint.

[0035] 3. Since each longitudinal joint and each transverse joint is formed by pouring ECC high-toughness fiber cement-based composite materials, ECC high-toughness fiber cement-based composite materials have the advantages of high tensile strength and high ductility. That is, cast-in-place ECC wet joints can solve the problems of traditional wet joints such as easy cracking and poor anti-permeability.

[0036] 4. The assembled all-FRP bridge deck structure has the advantages of novel design, good durability and long service life. The assembled all-FRP bridge deck structure constructed by the above construction method also has the advantages of novel design, good durability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0038] FIG1 is a schematic structural diagram of the present invention.

[0039] FIG2 is a partially enlarged schematic diagram of FIG1 .

[0040] FIG3 is a schematic structural diagram of the FRP connector of the present invention.

[0041] FIG4 is a schematic diagram of connecting two aligned FRP connectors according to the present invention.

[0042] Figures 1 to 4 include:

[0043] 1-Supporting box girder; 11-Concrete portion of box girder; 12-Longitudinal FRP bars of box girder; 13-FRP closed stirrups of box girder; 2-Bridge deck; 21-Concrete portion of deck; 22-Longitudinal FRP bars of deck; 23-Transverse FRP bars of deck; 24-FRP connector; 241-Intermediate rod; 242-Inner big end; 243-Outer big end; 244-Lifting ring; 3-FRP strip cloth; 4-Cast-in-place ECC wet joint; 5-Pavement layer. DETAILED DESCRIPTION

[0044] The present invention will be described below with reference to specific embodiments.

[0045] Embodiment 1, as shown in Figures 1 and 2, is an assembled all-FRP bridge deck structure, comprising a supporting box girder 1, and a plurality of bridge decks 2 paved on the upper surface of the supporting box girder 1 in sequence and at intervals. The supporting box girder 1 and each bridge deck 2 are prefabricated components; a transversely extending transverse joint is provided between two adjacent longitudinally spaced bridge decks 2, and a longitudinally extending longitudinal joint is provided between two transversely spaced bridge decks 2.

[0046] Specifically, as shown in Figures 1 and 2, the supporting box girder 1 includes a box girder concrete part 11, a box girder reinforcement network embedded in the box girder concrete part 11, and the box girder reinforcement network is composed of box girder longitudinal FRP bars 12 and box girder FRP closed stirrups 13 tied to the box girder longitudinal FRP bars 12.

[0047] Furthermore, as shown in Figures 1 and 2, each bridge panel 2 includes a panel concrete part 21 and a panel reinforcement network buried inside the panel concrete part 21. The panel reinforcement network is composed of longitudinal panel FRP bars 22 extending longitudinally and transverse panel FRP bars 23 tied to the longitudinal panel FRP bars 22 and extending transversely. The two end portions of the longitudinal panel FRP bars 22 and the two end portions of the transverse panel FRP bars 23 of each bridge panel 2 extend into the corresponding longitudinal joints and transverse joints respectively.

[0048] Furthermore, as shown in Figures 1 to 4, each edge portion of the bridge deck 2 is respectively provided with a plurality of FRP connectors 24 arranged in sequence along the corresponding edge, and each FRP connector 24 respectively includes an intermediate rod portion 241, an inner large head portion 242 provided at the inner end portion of the intermediate rod portion 241, and an outer large head portion 243 provided at the outer end portion of the intermediate rod portion 241; the inner end portion and the inner large head portion 242 of the intermediate rod portion 24 of each FRP connector 24 are respectively buried in the corresponding panel concrete portion 21, and the outer end portion and the outer large head portion 243 of the intermediate rod portion 241 of each FRP connector 24 are respectively extended into the corresponding longitudinal joints and transverse joints, and the outer large head portion 243 of each FRP connector 24 is respectively provided with a hanging ring 244.

[0049] It should be noted that the FRP connectors 24 in the longitudinal seam are arranged in a horizontal alignment, and the FRP connectors 24 in the transverse seam are arranged in a vertical alignment. The two aligned FRP connectors 24 are connected by the FRP strip cloth 3, and the two ends of the FRP strip cloth 3 are respectively connected to the hanging rings 244 of the FRP connector 24 on the corresponding side.

[0050] In addition, each longitudinal joint and each transverse joint is respectively formed into a cast-in-situ ECC wet joint 4 by pouring ECC high-toughness fiber cement-based composite material.

[0051] The assembled all-FRP bridge deck structure of the first embodiment has the following advantages, specifically:

[0052] 1. The box girder reinforcement mesh, which is composed of the box girder longitudinal FRP bars 12 and the box girder FRP closed stirrups 13, supporting the interior of the box girder 1, is made of FRP material. The panel reinforcement mesh structure, which is composed of the panel longitudinal FRP bars 22 and the panel transverse FRP bars 23, supporting the interior of the bridge deck 2, is also made of FRP material. Compared with the steel reinforcement structure inside the box girder and bridge deck 2 in the prior art, the box girder reinforcement mesh structure and the panel reinforcement mesh structure of the first embodiment have the advantage of good corrosion resistance and can solve the problems of concrete cracking, structural performance degradation, and shortened service life caused by steel corrosion.

[0053] 2. Two adjacent bridge decks 2 are connected by FRP connectors 24 and FRP strips 3. The FRP connectors 24 and FRP strips 3 are each made of FRP material, i.e., the FRP connectors 24 and FRP strips 3 each have the advantage of good corrosion resistance. The two bridge decks 2 are connected by the FRP connectors 24 and FRP strips 3, and the outer large end portions 243 of each FRP connector 24 and the FRP strips 3 are respectively located inside the cast-in-place ECC wet joint 4. This connection method can effectively improve the coordination and integrity of the bridge decks 2 and the cast-in-place ECC wet joint 4.

[0054] 3. Since each longitudinal joint and each transverse joint is formed by pouring ECC high-toughness fiber cement-based composite material to form a cast-in-place ECC wet joint 4, the ECC high-toughness fiber cement-based composite material has the advantages of high tensile strength and high ductility. That is, the cast-in-place ECC wet joint 4 can solve the problems of easy cracking and poor anti-permeability of traditional wet joints.

[0055] In summary, it can be seen that, through the above structural design, the assembled all-FRP bridge deck structure of the first embodiment has the advantages of novel design, good durability and long service life.

[0056] Embodiment 2, as shown in FIG1 and FIG2 , is different from Embodiment 1 in that the side surfaces of each bridge deck 2 are stepped surfaces, and each longitudinal joint and each transverse joint are in a tongue-and-groove shape.

[0057] Each vertical plane on the side of the bridge deck 2 is provided with an FRP connector 24 , that is, each edge portion of the bridge deck 2 is provided with at least two layers of FRP connectors 24 spaced apart from each other.

[0058] It should be explained that the longitudinal and transverse joints with tongue-and-groove design can provide the cast-in-place ECC wet joints 4 with a larger contact and bonding area with the side of the bridge deck 2, which can effectively improve the bonding strength between the cast-in-place ECC wet joints 4 and the bridge deck 2.

[0059] In addition, by designing at least two layers of FRP connectors 24 spaced apart from each other, the connection strength between two adjacent bridge decks 2 can be further increased, thereby further improving the coordination and integrity of the bridge decks 2 and the cast-in-place ECC wet joints 4.

[0060] Example 3, as shown in Figures 1 and 2, the difference between Example 3 and Example 1 is that each bridge deck 2 includes two panel reinforcement meshes arranged at intervals above and below, the upper panel reinforcement mesh is located at the top position of the corresponding panel concrete part 21, and the lower panel reinforcement mesh is located at the bottom position of the corresponding panel concrete part 21.

[0061] Example 4. The difference between Example 4 and Example 1 is that two layers of joint FRP reinforcement meshes are buried inside each cast-in-place ECC wet joint 4, and are arranged at intervals from top to bottom. Each joint FRP reinforcement mesh is composed of a longitudinal joint FRP reinforcement extending longitudinally and a transverse joint FRP reinforcement tied to the longitudinal joint FRP reinforcement and extending transversely.

[0062] Example 5. The difference between Example 5 and Example 1 is that the box girder FRP longitudinal reinforcement, the box girder FRP closed stirrups 13, the panel longitudinal FRP reinforcement 22, and the panel transverse FRP reinforcement 23 are GFRP reinforcement, BFRP reinforcement or CFRP reinforcement, and the box girder FRP longitudinal reinforcement, the box girder FRP closed stirrups 13, the panel longitudinal FRP reinforcement 22, and the panel transverse FRP reinforcement 23 are required to have a tensile strength higher than 800 MPa and an elastic modulus higher than 50 GPa; the bending strength of the box girder FRP closed stirrups 13 is higher than 50% of the ultimate tensile strength.

[0063] Example 6: The difference between Example 6 and Example 1 is that the FRP reinforcement ratio of the bridge deck 2 is 0.6%-1%.

[0064] Embodiment 7: The difference between this embodiment 7 and embodiment 1 is that the FRP strip cloth 3 is a CFRP strip cloth 3, and the tensile strength of the FRP strip cloth 3 is higher than 3000 MPa and the elastic modulus is higher than 200 GPa.

[0065] Example 8. The difference between Example 8 and Example 1 is that the ECC high-toughness fiber cement-based composite material used to cast the cast-in-place ECC wet joint 4 contains PVA fibers, and the compressive strength of the ECC high-toughness fiber cement-based composite material is 50 MPa and the tensile strength is 6.5 MPa.

[0066] ECC high-toughness fiber cement-based composite material includes cement, fly ash, limestone powder, metakaolin, silica fume, water reducer, and PVA fiber with a length of 12 mm. The masses of cement, fly ash, limestone powder, metakaolin, silica fume, water, sand, water reducer, and PVA fiber in 1 m3 of ECC high-toughness fiber cement-based composite material are 552 kg, 690 kg, 55.2 kg, 55.2 kg, 27.6 kg, 358.8 kg, 496.8 kg, 138 kg, and 24 kg, respectively.

[0067] Example 9. This Example 9 differs from Example 1 in that: the supporting box girder 1 and the bridge deck 2 are respectively cast and formed by SCC self-compacting concrete with a compressive strength of 60 MPa; the SCC self-compacting concrete includes crushed stone with a particle size distribution between 4.5 mm and 20 mm, sand with a particle size distribution between 0.1 and 4.5 mm, fly ash, cement, limestone powder, water, and F10 water reducer; the masses of crushed stone, sand, fly ash, cement, limestone powder, water, and F10 water reducer in 1 m 3 of SCC self-compacting concrete are 684.6 kg, 945.4 kg, 309.7 kg, 232.28 kg, 77.43 kg, 148.66 kg, and 0.124 kg, respectively.

[0068] Example 10: A construction method for an assembled all-FRP bridge deck structure, comprising the following process steps, specifically:

[0069] Step S1, prefabricating the supporting box girder 1 and the bridge deck 2: the supporting box girder 1 includes a box girder concrete portion 11, a box girder reinforcement mesh embedded in the box girder concrete portion 11, the box girder reinforcement mesh consisting of box girder longitudinal FRP bars 12 and box girder FRP closed stirrups 13 bound to the box girder longitudinal FRP bars 12; the bridge deck 2 includes a panel concrete portion 21, a panel reinforcement mesh embedded in the panel concrete portion 21, the panel reinforcement mesh consisting of longitudinal panel FRP bars 22 extending longitudinally and transverse panel FRP bars 23 bound to the longitudinal panel FRP bars 22 and extending transversely, with both ends of the longitudinal panel FRP bars 22 and both ends of the transverse panel FRP bars 23 extending out of the sides of the bridge deck 2 respectively;

[0070] Each edge of the bridge deck 2 is provided with a plurality of FRP connectors 24 spaced apart along the corresponding edge. Each FRP connector 24 includes an intermediate rod portion 241, an inner end portion 242 disposed at the inner end of the intermediate rod portion 241, and an outer end portion 243 disposed at the outer end of the intermediate rod portion 241. The inner end portion and the inner end portion 242 of the intermediate rod portion 241 of the FRP connector 24 are respectively buried within the concrete portion 21 of the deck, while the outer end portion and the outer end portion 243 of the intermediate rod portion 241 of the FRP connector 24 extend out of the side of the bridge deck 2. The outer end portion 243 of the FRP connector 24 is provided with a lifting ring 244.

[0071] Step S2: transporting the prepared supporting box girder 1 and bridge deck 2 to the construction site, and paving a plurality of bridge decks 2 on the upper surface of the supporting box girder 1;

[0072] Several bridge decks 2 paved on the upper surface of the supporting box girder 1 are arranged in sequence at intervals. A transverse joint extending in the transverse direction is provided between two adjacent longitudinally spaced bridge decks 2, and a longitudinal joint extending in the longitudinal direction is provided between two transversely spaced bridge decks 2. Both ends of the longitudinal FRP bars 22 and the transverse FRP bars 23 of each bridge deck 2 extend into the corresponding longitudinal joint and transverse joint, respectively.

[0073] The outer end portion of the intermediate rod portion 241 and the outer large end portion 243 of each FRP connector 24 extend into the corresponding longitudinal seam and transverse seam respectively. The FRP connectors 24 in the longitudinal seam are aligned transversely, and the FRP connectors 24 in the transverse seam are aligned longitudinally.

[0074] Step S3: Formwork is provided at the bottom of the longitudinal and transverse seams, and joint FRP reinforcement mesh is laid at the longitudinal and transverse seams. Then, two aligned FRP connectors are connected by FRP strip fabric 3. During this process, the two ends of the FRP strip fabric 3 are connected to the corresponding side of the FRP connector 24, respectively, to form an FRP strip closed cable.

[0075] Step S4, pouring ECC high-toughness fiber cement-based composite materials in the longitudinal joints and transverse joints to form cast-in-place ECC wet joints 4, and removing the formwork after curing;

[0076] Step S5, constructing the pavement layer 5; wherein, the pavement layer 5 is made of epoxy asphalt concrete, which has the advantages of high strength, good fatigue performance, good durability, etc.

[0077] It should be noted that the assembled all-FRP bridge deck structure constructed by the construction method of the tenth embodiment has the advantages of novel design, good durability and long service life.

[0078] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. An assembled all-FRP bridge deck structure, comprising a supporting box girder (1), a plurality of bridge decks (2) sequentially spaced apart and paved on the upper surface of the supporting box girder (1), the supporting box girder (1) and each bridge deck (2) being a prefabricated component; a transverse joint extending transversely is provided between two adjacent bridge decks (2) spaced apart longitudinally, and a longitudinal joint extending longitudinally is provided between two bridge decks (2) spaced apart transversely; Features: The supporting box girder (1) comprises a box girder concrete portion (11), a box girder reinforcement mesh embedded in the box girder concrete portion (11), the box girder reinforcement mesh comprising box girder longitudinal FRP reinforcement (12), and box girder FRP closed stirrups (13) tied to the box girder longitudinal FRP reinforcement (12); Each bridge deck (2) comprises a deck concrete portion (21), a deck reinforcement network embedded in the deck concrete portion (21), the deck reinforcement network comprising a deck longitudinal FRP reinforcement (22) extending longitudinally, and a deck transverse FRP reinforcement (23) bound to the deck longitudinal FRP reinforcement (22) and extending transversely; both ends of the deck longitudinal FRP reinforcement (22) and both ends of the deck transverse FRP reinforcement (23) of each bridge deck (2) extend into corresponding longitudinal joints and transverse joints respectively; Each edge portion of the bridge deck (2) is provided with a plurality of FRP connectors (24) arranged in sequence along the corresponding edge at intervals, each FRP connector (24) comprising an intermediate rod portion (241), an inner large end portion (242) arranged at the inner end portion of the intermediate rod portion (241), and an outer large end portion (243) arranged at the outer end portion of the intermediate rod portion (241); the inner end portion of the intermediate rod portion (241) and the inner large end portion (242) of each FRP connector (24) are respectively buried inside the corresponding deck concrete portion (21), the outer end portion of the intermediate rod portion (241) and the outer large end portion (243) of each FRP connector (24) are respectively extended into the corresponding longitudinal joint and transverse joint, and the outer large end portion (243) of each FRP connector (24) is respectively provided with a lifting ring (244); The FRP connectors (24) in the longitudinal seams are arranged in a horizontally aligned manner. The FRP connectors (24) in the transverse seams are arranged in a vertically aligned manner. Two aligned FRP connectors (24) are connected via an FRP strip cloth (3). The two ends of the FRP strip cloth (3) are respectively connected to the lifting rings (244) of the FRP connectors (24) on the corresponding sides. Each longitudinal joint and each transverse joint is formed into a cast-in-place ECC wet joint (4) by pouring ECC high-toughness fiber cement-based composite material.

2. The assembled all-FRP bridge deck structure according to claim 1, characterized in that: The side surfaces of each of the bridge decks (2) are respectively stepped surfaces, and each of the longitudinal joints and each of the transverse joints are respectively in a tongue-and-groove shape; Each vertical plane on the side of the bridge deck (2) is respectively provided with an FRP connector (24), that is, each edge portion of the bridge deck (2) is respectively provided with at least two layers of FRP connectors (24) arranged in an upper and lower interval.

3. The assembled all-FRP bridge deck structure according to claim 1, characterized in that: Each of the bridge panels (2) comprises two panel reinforcement nets spaced apart from each other, the upper panel reinforcement net being located at the top of the corresponding panel concrete part (21), and the lower panel reinforcement net being located at the bottom of the corresponding panel concrete part (21).

4. The assembled all-FRP bridge deck structure according to claim 1, characterized in that: Two layers of joint FRP reinforcement meshes are respectively embedded in each of the cast-in-place ECC wet joints (4) and are arranged at intervals in an upper and lower manner. Each joint FRP reinforcement mesh is respectively composed of a joint longitudinal FRP reinforcement extending longitudinally and a joint transverse FRP reinforcement bound to the joint longitudinal FRP reinforcement and extending transversely.

5. The assembled all-FRP bridge deck structure according to claim 1, characterized in that: The box girder FRP longitudinal reinforcement, the box girder FRP closed stirrups (13), the panel longitudinal FRP reinforcement (22), and the panel transverse FRP reinforcement (23) are GFRP reinforcements, BFRP reinforcements, or CFRP reinforcements, and the box girder FRP longitudinal reinforcement, the box girder FRP closed stirrups (13), the panel longitudinal FRP reinforcement (22), and the panel transverse FRP reinforcement (23) are required to have a tensile strength higher than 800 MPa and an elastic modulus higher than 50 GPa; the box girder FRP closed stirrups (13) have a flexural strength higher than 50% of the ultimate tensile strength.

6. The assembled all-FRP bridge deck structure according to claim 1, characterized in that: The FRP reinforcement ratio of the bridge deck (2) is 0.6%-1%.

7. The assembled all-FRP bridge deck structure according to claim 1, characterized in that: The FRP strip cloth (3) is a CFRP strip cloth (3), and the FRP strip cloth (3) has a tensile strength higher than 3000 MPa and an elastic modulus higher than 200 GPa.

8. The assembled all-FRP bridge deck structure according to claim 1, characterized in that: The ECC high-toughness fiber cement-based composite material used to cast the cast-in-place ECC wet joint (4) contains PVA fibers, and the ECC high-toughness fiber cement-based composite material has a compressive strength of 50 MPa and a tensile strength of 6.5 MPa; The ECC high-toughness fiber cement-based composite material includes cement, fly ash, limestone powder, metakaolin, silica fume, water reducer, and PVA fiber with a length of 12 mm. The masses of cement, fly ash, limestone powder, metakaolin, silica fume, water, sand, water reducer and PVA fiber in 1 m3 of ECC high-toughness fiber cement-based composite material are 552 kg, 690 kg, 55.2 kg, 55.2 kg, 27.6 kg, 358.8 kg, 496.8 kg, 138 kg and 24 kg, respectively.

9. The assembled all-FRP bridge deck structure according to claim 1, characterized in that: The supporting box girder (1) and the bridge deck (2) are cast and formed respectively by SCC self-compacting concrete with a compressive strength of 60 MPa; the SCC self-compacting concrete comprises crushed stone with a particle size distribution between 4.5 mm and 20 mm, sand with a particle size distribution between 0.1 mm and 4.5 mm, fly ash, cement, limestone powder, water, and F10 water reducer; the masses of crushed stone, sand, fly ash, cement, limestone powder, water, and F10 water reducer in 1 m3 of the SCC self-compacting concrete are 684.6 kg, 945.4 kg, 309.7 kg, 232.28 kg, 77.43 kg, 148.66 kg, and 0.124 kg, respectively.

10. A construction method for an assembled all-FRP bridge deck structure, characterized in that: The process includes the following steps, specifically: Step S1, prefabricating a supporting box girder (1) and a bridge deck (2): the supporting box girder (1) comprises a box girder concrete portion (11) and a box girder reinforcement mesh embedded in the box girder concrete portion (11), the box girder reinforcement mesh consisting of box girder longitudinal FRP reinforcement (12) and box girder FRP closed stirrups (13) bound to the box girder longitudinal FRP reinforcement (12); the bridge deck (2) comprises a deck concrete portion (21) and a deck reinforcement mesh embedded in the deck concrete portion (21), the deck reinforcement mesh consisting of longitudinal deck FRP reinforcement (22) extending longitudinally and transverse deck FRP reinforcement (23) bound to the longitudinal deck FRP reinforcement (22) and extending transversely, the two ends of the longitudinal deck FRP reinforcement (22) and the two ends of the transverse deck FRP reinforcement (23) respectively extending out of the side surfaces of the bridge deck (2); A plurality of FRP connectors (24) are provided at each edge of the bridge deck (2) and are arranged in sequence along the corresponding edge at intervals. Each FRP connector (24) comprises an intermediate rod portion (241), an inner large end portion (242) provided at the inner end portion of the intermediate rod portion (241), and an outer large end portion (243) provided at the outer end portion of the intermediate rod portion (241). The inner end portion of the intermediate rod portion (241) and the inner large end portion (242) of the FRP connector (24) are respectively buried inside the concrete portion (21) of the deck. The outer end portion of the intermediate rod portion (241) and the outer large end portion (243) of the FRP connector (24) extend out of the side of the bridge deck (2), and the outer large end portion (243) of the FRP connector (24) is provided with a lifting ring (244). Step S2, transporting the prepared supporting box girder (1) and bridge deck (2) to the construction site, and paving a plurality of bridge decks (2) on the upper surface of the supporting box girder (1); A plurality of bridge decks (2) paved on the upper surface of the supporting box girder (1) are arranged in sequence at intervals, a transverse joint extending transversely is provided between two adjacent bridge decks (2) spaced longitudinally, and a longitudinal joint extending longitudinally is provided between two bridge decks (2) spaced transversely; both ends of the longitudinal FRP bars (22) of the deck and both ends of the transverse FRP bars (23) of the deck extend into the corresponding longitudinal joint and transverse joint respectively; The outer end portion of the middle rod portion (241) and the outer large end portion (243) of each FRP connector (24) extend into the corresponding longitudinal joint and transverse joint respectively, the FRP connectors (24) in the longitudinal joint are arranged in a transversely aligned manner, and the FRP connectors (24) in the transverse joint are arranged in a longitudinally aligned manner; Step S3, supporting the formwork at the bottom of the longitudinal joint and the transverse joint, laying the joint FRP reinforcement mesh at the longitudinal joint and the transverse joint, and then connecting the two aligned FRP connectors through the FRP strip cloth (3). In this process, the two ends of the FRP strip cloth (3) are respectively connected to the lifting rings (244) of the FRP connector (24) on the corresponding side to form the FRP strip closed cable; Step S4, pouring ECC high-toughness fiber cement-based composite materials at the longitudinal joints and transverse joints to form cast-in-place ECC wet joints (4), and removing the formwork after curing; Step S5, constructing a paving layer (5).

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