A prefabricated concrete arch bridge

Abstract

The utility model relates to bridge engineering technical field especially relates to a kind of fabricated concrete arch bridge, comprising: main arch ring, including the segmented prefabrication of multiple concrete arch rib units along arch axis direction;Arch rib connecting piece, between the end surface of adjacent two concrete arch rib units, for the splicing of adjacent two concrete arch rib units;Prefabricated bridge deck, laid below main arch ring, the bridge deck is connected with main arch ring by suspender;Support, set at the two ends of main arch ring arch foot, for supporting entire arch bridge structure;Advantages are: structure stress is reasonable, material utilization is efficient, assembly degree is high, construction is convenient and efficient, connection is reliable, integrity and durability are equipped with, modular design is flexible, and application range is wide.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, and in particular to a prefabricated concrete arch bridge. Background Technology

[0002] Traditional concrete arch bridges are mostly constructed using cast-in-place methods, which suffer from problems such as long construction periods, large amounts of formwork, poor adaptability to terrain, and serious environmental pollution. With the development of industrialized construction technology, prefabricated structures are gradually gaining popularity due to their advantages such as high degree of prefabrication, less on-site work, and faster construction speed.

[0003] Most existing prefabricated arch bridges adopt steel-concrete composite structures or steel structures, which have high construction costs. Meanwhile, fully prefabricated concrete arch bridges still face certain technical bottlenecks in terms of connection reliability and overall load-bearing performance. Therefore, there is an urgent need for a fully prefabricated concrete arch bridge structure that is structurally sound, reliably connected, and easy to transport and install.

[0004] Therefore, this case is brought. Utility Model Content

[0005] The purpose of this utility model is to provide a prefabricated concrete arch bridge, which is mainly suitable for small and medium span landscape bridges for pedestrian and non-motorized vehicle traffic, especially suitable for areas with complex geological conditions and limited construction environment. Through modular design and efficient connection system, it aims to improve the construction efficiency of this type of bridge and reduce the construction cost of the bridge.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A prefabricated concrete arch bridge, comprising: The main arch ring consists of multiple precast concrete arch rib units along the arch axis. Arch rib connectors are installed between the end faces of two adjacent concrete arch rib units for splicing two adjacent concrete arch rib units. The prefabricated bridge deck is laid under the main arch ring, and the bridge deck is connected to the main arch ring by hangers; Supports are placed at the arch feet at both ends of the main arch ring to support the entire arch bridge structure.

[0008] Furthermore, it includes a main arch ring connector, which is disposed between two adjacent main arch rings for splicing two adjacent main arch rings.

[0009] Furthermore, the bridge deck connector includes a caulking block and a connecting plate. A gap is reserved between two adjacent bridge decks. The caulking block is used to be inserted into the reserved gap and fixed in the middle of the bottom surface of the connecting plate. The two sides of the bottom surface of the connecting plate are respectively fixedly connected to the top surfaces of the two adjacent bridge decks.

[0010] Furthermore, the arch rib connector includes a central connector and a non-central connector. The central connector is used for splicing two adjacent concrete arch rib units at the center of the main arch ring, and the non-central connector is used for splicing two adjacent concrete arch rib units at the non-center of the main arch ring.

[0011] Furthermore, the non-central connector includes a connecting block and an encapsulated side plate. The connecting block has flanges at both ends. The concrete arch rib unit is provided with bolt and nut assemblies connected to the flanges at the end faces adjacent to the flanges. When two adjacent concrete arch rib units are spliced ​​together by the connecting block, the encapsulated side plate covers the outside of the connecting block. The end faces and encapsulated side plates of two adjacent concrete arch rib units together enclose a closed space, and one or more of the encapsulated side plates are provided with grouting holes, through which grout can be injected into the closed space.

[0012] Furthermore, the central connector is a hinged connection node, which allows two adjacent concrete arch rib units located at the center of the main arch ring to be hingedly connected.

[0013] Furthermore, the support is a hinged support that can constrain horizontal and vertical displacement and allow rotation, and the arch feet at both ends of the main arch ring are hinged to the hinged support.

[0014] Furthermore, the length of the boom is adjustable.

[0015] Furthermore, the lifting rod includes an upper lifting rod, an upper limit nut, a connecting sleeve, a lower limit nut, and a lower lifting rod. Both the upper and lower ends of the connecting sleeve are provided with internal threaded sleeves. The lower end of the upper lifting rod is a screw structure and can be screwed into the upper internal threaded sleeve of the connecting sleeve. The upper limit nut is threadedly connected to the upper lifting rod. The upper end of the lower lifting rod is a screw structure and can be screwed into the lower internal threaded sleeve of the connecting sleeve. The lower limit nut is threadedly connected to the lower lifting rod.

[0016] Furthermore, the concrete arch rib unit uses C50 or higher grade concrete and is internally configured with a steel reinforcement skeleton formed by stirrups and longitudinal steel bars.

[0017] The advantages of this utility model are:

[0018] 1. The structure is rationally stressed and the materials are used efficiently. The main arch ring adopts a parabolic three-hinged or two-hinged arch system, so that the concrete arch ribs mainly bear the compressive force under load, giving full play to the advantages of high compressive strength and low cost of concrete; at the same time, high-strength concrete of C50 and above and reasonable reinforcement improve the crack resistance and stability of the components, significantly reducing the construction cost compared with steel structure arch bridges.

[0019] 2. High degree of prefabrication and convenient and efficient construction. All components (including arch rib units, bridge decks, connectors, etc.) are prefabricated in the factory, and only hoisting and splicing are required on site, which significantly shortens the construction period, reduces high-altitude operations and formwork support, and is especially suitable for mountainous or scenic areas with complex terrain and sensitive environment, reducing construction safety risks and dust pollution.

[0020] 3. Reliable connection, integrity and durability. The arch rib units are connected by a dual "mechanical + chemical" connection (high-strength bolts + closed cavity grouting). The length of the bridge deck hangers is adjustable to precisely control the elevation and initial tension. The arch foot works in conjunction with the inclined pile foundation through the anti-thrust hinge support to ensure effective transmission of horizontal thrust. The structural force transmission path is clear and the deformation adaptability is strong.

[0021] 4. Modular design offers flexibility and wide applicability. The number of arch rib segments, rise-to-span ratio, and lateral connection method can be adjusted according to the span, load, and terrain conditions. It is particularly suitable for pedestrian and non-motorized vehicle landscape bridges with small to medium spans, combining industrialized construction efficiency with aesthetic appeal, and promoting green and low-carbon bridge construction. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the prefabricated concrete arch bridge in the embodiment; Figure 2 for Figure 1 A top-down view; Figure 3 for Figure 1 A side view diagram; Figure 4 for Figure 1 A schematic diagram of the China-Africa central connector after removing part of the encapsulation side plate; Figure 5 for Figure 4 Enlarged diagram of part A in the diagram; Figure 6 This is a schematic diagram showing the two arch feet of the main arch ring hinged to the hinge support in the embodiment. Figure 7 This is a schematic diagram of the adjustable length suspension rod in the embodiment; Figure 8 for Figure 4 Enlarged schematic diagram of part B in the diagram; Figure 9 for Figure 8 An explosion diagram; Label Explanation 1. Main arch ring; 101. Concrete arch rib unit; 201. Central connector; 202. Non-central connector; 2021. Connecting block; 2022. Flange; 2023. Encapsulated side plate; 2024. Grouting hole; 3. Bridge deck; 4. Support; 5. Main arch ring connector; 6. Bridge deck connector; 601. Sealing block; 602. Connecting plate; 7. Hanger; 701. Upper hanger; 702. Upper limit nut; 703. Connecting sleeve; 704. Lower limit nut; 705. Lower hanger. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the embodiments. It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicated by the accompanying drawings are only for the convenience of describing the present invention and simplifying the description, and are not intended to 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 the present invention.

[0024] This embodiment proposes a prefabricated concrete arch bridge, such as... Figures 1 to 9 As shown, the technical solution is based on the "arch rib-suspender-bridge deck" collaborative force system, and realizes prefabricated construction through prefabricated component design and reliable connection process. It includes main arch ring 1, arch rib connector, prefabricated bridge deck 3, support 4, main arch ring connector 5 and bridge deck connector 6.

[0025] refer to Figure 1 and Figure 2 In this embodiment, there are two main arch rings 1, and each main arch ring 1 consists of four precast concrete arch rib units 101. The eight concrete arch rib units 101 in the two main arch rings 1 form an "X" shape when viewed from above. The four concrete arch rib units 101 of each main arch ring 1 are precast in segments along the arch axis, and the arch axis formula is... y represents the height of the main arch axis at a horizontal distance x from the origin of the arch, l represents the span of the bridge, and f represents the arch height of the bridge. In this embodiment, the concrete arch rib unit 101 uses C50 or higher grade concrete and is internally configured with composite stirrups and longitudinal steel bars to form a composite structure with strong compressive strength and good crack resistance.

[0026] The arch rib connector includes a central connector 201 and a non-central connector 202. The central connector 201 is used for splicing two adjacent concrete arch rib units 101 at the center of the main arch ring 1, and the non-central connector 202 is used for splicing two adjacent concrete arch rib units 101 at the non-center of the main arch ring 1. Figure 2As shown, the central connector 201 is a hinged connection node, which hinges two adjacent concrete arch rib units 101 located at the center of the main arch ring 1. Figures 3 to 5 As shown, the non-central connector 202 includes a connecting block 2021 and an encapsulated side plate 2023. Flanges 2022 are provided at both ends of the connecting block 2021. Bolt and nut assemblies connecting to the flanges 2022 are provided at the end faces of the concrete arch rib units 101 adjacent to the flanges 2022. When two adjacent concrete arch rib units 101 are spliced ​​together via the connecting block 2021, the encapsulated side plate 2023 surrounds the outside of the connecting block 2021. The end faces of two adjacent concrete arch rib units 101 and the encapsulated side plate 2023 enclose a closed space. One or more encapsulated side plates 2023 are provided with grouting holes 2024. Grout can be injected into the closed space through the grouting holes 2024. The injected grout can be epoxy resin or cement-based grouting material, used to fill the closed space to enhance the connection strength and durability, so that the assembled main arch ring 1 has good strength, rigidity, and stability.

[0027] In addition, such as Figure 1 and Figure 3 As shown, a transverse main arch ring connector 5 is provided between two adjacent main arch rings 1. The main arch ring connector 5 is located between two adjacent main arch rings 1 for splicing the two adjacent main arch rings 1, thereby improving torsional stiffness and lateral stability. In this embodiment, the main arch ring connector 5 is a prefabricated steel cross brace arranged at a specific cross-section between the arch ribs. The two main arch rings 1 are integrated by the arch rib connector and the transverse main arch ring connector 5.

[0028] In this embodiment, the support 4 is a hinged support 4 that can constrain horizontal and vertical displacements and allows rotation. The hinged support 4 is installed in the ground foundation, and the arch feet at both ends of the main arch ring 1 are hinged to the hinged support 4. The hinged support 4 is used to support the entire arch bridge structure. Under the premise of ensuring reliable transmission of vertical force and horizontal thrust, it improves the structure's adaptability to foundation deformation and construction errors by releasing bending moment and allowing small rotations, thus ensuring the safety and durability of the arch bridge.

[0029] The hinge at the center of the main arch ring 1 and the hinges at the arch feet at both ends complete the auxiliary arch ring 1. Figure 1 Arrangement of the three-hinged arch.

[0030] The bridge deck 3 is made of precast concrete slabs or composite slabs and is laid under the main arch ring 1. The bridge deck 3 and the main arch ring 1 are connected by hangers 7. Figure 4 , Figure 8 and Figure 9As shown, the bridge deck connector 6 includes a caulking block 601 and a connecting plate 602. A gap is reserved between two adjacent bridge deck panels 3. The caulking block 601 is used to insert into the reserved gap and is fixed to the center of the bottom surface of the connecting plate 602. The two sides of the bottom surface of the connecting plate 602 are respectively fixedly connected to the top surfaces of the two adjacent bridge deck panels 3. The reserved gap between the bridge deck panels 3 is intended to allow for process errors and installation errors during the prefabrication of the bridge deck panels 3. On the other hand, the concrete material will change in size due to temperature changes (thermal expansion and contraction) and its own shrinkage and creep. The reserved gap allows each panel to undergo independent micro-deformation, effectively releasing temperature deformation and shrinkage creep stress, and improving structural durability.

[0031] After the bridge deck 3 is installed, adjacent bridge decks 3 are fixed together by bridge deck connectors 6. The bridge deck connectors 6 include caulking blocks 601 and connecting plates 602. A gap is reserved between adjacent bridge decks 3. The caulking blocks 601 are inserted into the reserved gap and fixed to the center of the bottom surface of the connecting plate 602. The two sides of the bottom surface of the connecting plate 602 are fixedly connected to the top surfaces of the two adjacent bridge decks 3. Adjacent precast bridge decks 3 will experience slight relative displacement under vehicle or pedestrian loads. The connecting plate 602, fixed to the top surfaces of the two bridge decks 3, forms a shear key, effectively transmitting lateral and longitudinal shear forces, preventing panel slippage, and improving the overall rigidity of the bridge deck, thus balancing structural integrity, construction efficiency, and long-term durability. The caulking blocks 601 are mainly used to improve the strength and shear resistance of the connecting plate 602.

[0032] In this embodiment, the hanger 7 adopts an adjustable length structure to achieve precise positioning of the bridge deck 3, thereby improving the convenience of on-site installation. Preferably, as follows... Figure 7 As shown, the suspension rod 7 includes an upper suspension rod 701, an upper limit nut 702, a connecting sleeve 703, a lower limit nut 704, and a lower suspension rod 705. Both ends of the connecting sleeve 703 are provided with internally threaded sleeves. The lower end of the upper suspension rod 701 is a screw structure and can be screwed into the upper internally threaded sleeve of the connecting sleeve 703. The upper limit nut 702 is threadedly connected to the upper suspension rod 701. The upper end of the upper suspension rod 701 is connected to the main arch ring 1 via an anchor. The upper end of the lower suspension rod 705 is a screw structure and can be screwed into the lower internally threaded sleeve of the connecting sleeve 703. The lower limit nut 704 is threadedly connected to the lower suspension rod 705. The lower end of the lower suspension rod 705 is connected to the bridge deck 3 via an anchor. The hanger 7 is installed between the main arch ring 1 and the bridge deck 3, either vertically or diagonally, to transfer the load of the bridge deck 3 to the main arch ring 1. The load on the main arch ring 1 is then transferred to the supports 4 at both ends.

[0033] Taking the adjustment of the upper suspension rod 701 as an example, when it is necessary to adjust the length of the upper suspension rod 701, first loosen the upper limit nut 702, and then screw the upper suspension rod 701 in or out to achieve fine adjustment of the length. After the length adjustment is completed, tighten the upper limit nut 702.

[0034] In addition, the assembly of the aforementioned prefabricated concrete arch bridge utilizes BIM technology for modeling and construction simulation to ensure precision control.

[0035] This embodiment utilizes prefabricated concrete arch rib units 101, bridge deck 3, and adjustable-length hangers 7, combined with a dual "mechanical + chemical" connection node and hinged supports 4. This approach fully leverages the advantages of concrete's high compressive strength and low cost, while achieving a high degree of prefabrication and rapid on-site assembly. The overall structure features a clear force transmission path and is insensitive to foundation settlement, making it particularly suitable for pedestrian and landscape bridges with small to medium spans. Even in complex terrain conditions, it ensures construction safety, environmental protection, and quality control.

[0036] The above embodiments are only used to explain the concept of the present invention, and are not intended to limit the protection of the present invention. Any non-substantial modifications made to the present invention using this concept should fall within the protection scope of the present invention.

Claims

1. A prefabricated concrete arch bridge, characterized in that, include: The main arch ring consists of multiple precast concrete arch rib units along the arch axis. Arch rib connectors are installed between the end faces of two adjacent concrete arch rib units for splicing two adjacent concrete arch rib units. The prefabricated bridge deck is laid under the main arch ring, and the bridge deck is connected to the main arch ring by hangers; Supports are placed at the arch feet at both ends of the main arch ring to support the entire arch bridge structure.

2. The prefabricated concrete arch bridge as described in claim 1, characterized in that, It includes a main arch ring connector, which is set between two adjacent main arch rings for splicing two adjacent main arch rings.

3. A prefabricated concrete arch bridge as described in claim 1, characterized in that, The bridge deck connector includes a caulking block and a connecting plate. A gap is reserved between two adjacent bridge decks. The caulking block is used to be inserted into the reserved gap and fixed in the middle of the bottom surface of the connecting plate. The two sides of the bottom surface of the connecting plate are respectively fixedly connected to the top surface of the two adjacent bridge decks.

4. A prefabricated concrete arch bridge as described in claim 1, characterized in that, The arch rib connector includes a central connector and a non-central connector. The central connector is used for splicing two adjacent concrete arch rib units at the center of the main arch ring, and the non-central connector is used for splicing two adjacent concrete arch rib units at the non-center of the main arch ring.

5. A prefabricated concrete arch bridge as described in claim 4, characterized in that, The non-central connector includes a connecting block and an encapsulated side plate. The connecting block has flanges at both ends. The concrete arch rib unit is provided with bolt and nut assemblies connected to the flanges at the end faces adjacent to the flanges. When two adjacent concrete arch rib units are spliced ​​together by the connecting block, the encapsulated side plate surrounds the outside of the connecting block. The end faces and encapsulated side plates of two adjacent concrete arch rib units enclose a closed space, and one or more of the encapsulated side plates are provided with grouting holes, through which grout can be injected into the closed space.

6. A prefabricated concrete arch bridge as described in claim 4, characterized in that, The central connector is a hinged connection node, which allows two adjacent concrete arch rib units located at the center of the main arch ring to be hingedly connected.

7. A prefabricated concrete arch bridge as described in claim 1, characterized in that, The support is a hinged support that can constrain horizontal and vertical displacement and allow rotation, and the arch feet at both ends of the main arch ring are hinged to the hinged support.

8. A prefabricated concrete arch bridge as described in claim 1, characterized in that, The length of the boom is adjustable.

9. A prefabricated concrete arch bridge as described in claim 8, characterized in that, The lifting rod includes an upper lifting rod, an upper limit nut, a connecting sleeve, a lower limit nut, and a lower lifting rod. Both ends of the connecting sleeve are provided with internally threaded sleeves. The lower end of the upper lifting rod is a screw structure and can be screwed into the upper internally threaded sleeve of the connecting sleeve. The upper limit nut is threadedly connected to the upper lifting rod. The upper end of the lower lifting rod is a screw structure and can be screwed into the lower internally threaded sleeve of the connecting sleeve. The lower limit nut is threadedly connected to the lower lifting rod.

10. A prefabricated concrete arch bridge as described in claim 1, characterized in that, The concrete arch rib unit uses C50 or higher grade concrete and is internally reinforced with stirrups and longitudinal steel bars.

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