A method for rapid installation of crossbeams between ribs of a concrete arch bridge

Abstract

This invention discloses a rapid construction method for installing crossbeams between ribs of a concrete arch bridge, comprising the following steps: S1, prefabricating crossbeams for structural support between two arch ribs of the arch bridge, wherein each arch rib has an installation position for the crossbeam, a first joint reinforcement extending from the installation position, and a second joint reinforcement extending from the beam end of the corresponding crossbeam; S2, installing a support device between the two arch ribs for temporary support; S3, installing a position adjustment device between the two arch ribs to assist in moving and stabilizing the crossbeam to the installation position; S4, hoisting the crossbeam to the installation position, welding the first and second joint reinforcements, and pouring concrete at the joint reinforcement positions to complete the connection between the prefabricated crossbeam and the two arch ribs; this invention solves the technical problem of slow construction progress and long construction period caused by the on-site casting method for crossbeams between arch ribs.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, specifically to a method for rapid installation of crossbeams between ribs of a concrete arch bridge. Background Technology

[0002] In recent years, with economic and technological development, the span of arch bridges has been continuously updated, especially in the field of concrete arch bridge construction. For example, the main arch span of the Tian'e Longtan Grand Bridge (a rigid frame concrete arch bridge) reaches 600m, and the main arch span of the Shuiluohe Grand Bridge (a cantilevered concrete arch bridge) reaches 342m.

[0003] As the span of a concrete arch bridge increases, the self-weight of the main arch also increases. To reduce the self-weight effect of the main arch, rib (box) arch bridges have emerged. Compared with conventional concrete arch bridges, the main arch is transformed from an integral box arch into a split rib box arch, with the arch ribs connected by crossbeams. This greatly reduces the weight of the main arch, allowing for a further increase in the span of the arch.

[0004] However, to ensure the lateral stability of the main arch, multiple inter-rib beams are installed between the main arch ribs. The larger the main arch span, the more inter-rib beams are required. The existing conventional construction method is on-site casting. The traditional construction method and sequence for the arch ribs and inter-rib beams of arch bridges using cast-in-place concrete is as follows: First, before construction, steel bars are processed according to the design drawings, and welding, bending, and other operations are performed according to specifications to ensure that the quality of the steel bars meets the requirements. Then, the corresponding formwork supports are erected according to the design, and the formwork surface is treated to ensure the smoothness and flatness of the concrete surface. Then, the concrete is transported to the arch rib casting position and poured using the grouting method or the throwing method. After the arch ribs have initially hardened, they need to be left for a certain period of time to achieve sufficient strength and stability. Then, the steel bars for the inter-rib beams are processed and bound according to the design requirements, and the formwork is erected. Then, the concrete is transported to the beam casting position and poured using techniques such as low-pressure jetting or vertical grouting. After the concrete is poured, sufficient curing measures are taken to ensure the strength and durability of the concrete.

[0005] When using conventional on-site casting methods, the construction period of the main arch is greatly increased, as is the construction cost. Therefore, finding a safe, applicable, economical, fast, and efficient assembly mode for the main arch ribs and inter-rib crossbeams, as well as a construction method for installing the concrete inter-rib crossbeams, can effectively shorten the construction period of the inter-rib crossbeams while ensuring the lateral stability of the arch ribs. Summary of the Invention

[0006] The purpose of this invention is to provide a rapid installation method for the crossbeams between the ribs of a concrete arch bridge, in order to solve the technical problem of slow construction progress and long construction period caused by the on-site casting method for the crossbeams between the ribs of the arch bridge. This invention can improve the construction speed of the crossbeams between the ribs of the concrete arch bridge and effectively replace the traditional process of on-site binding of reinforcing bars, installation of formwork and pouring of crossbeam concrete, thus saving time and cost.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A rapid construction method for installing the crossbeams between the ribs of a concrete arch bridge includes the following steps:

[0009] S1. A precast inter-rib crossbeam is used for structural support between two arch ribs of an arch bridge. The arch rib has an installation position for the inter-rib crossbeam. A first joint steel bar extends from the installation position, and a second joint steel bar extends from the beam end of the corresponding inter-rib crossbeam.

[0010] S2. Install a support device between the two arch ribs to provide temporary support for the two arch ribs;

[0011] S3. Install a position adjustment device between the two arch ribs to assist the inter-rib crossbeam in moving and stabilizing it in the installation position;

[0012] S4. Hoist the inter-rib beam to the installation position, weld the first joint reinforcement bar and the second joint reinforcement bar, and pour concrete at the joint reinforcement bar position to complete the connection between the precast inter-rib beam and the two arch ribs.

[0013] Preferably, in step S1, there are multiple first joint reinforcement bars and multiple second joint reinforcement bars; the first joint reinforcement bar protrudes from the side wall of the arch rib and extends in a direction away from the side wall of the arch rib, and the second joint reinforcement bar protrudes from the end face of the beam and extends in a direction away from the end face of the beam; when the inter-rib crossbeam is in the installation position, the first joint reinforcement bar and the second joint reinforcement bar can cross each other.

[0014] In specific implementation, in order to facilitate the handling and hoisting of the interrib beam, as a structural improvement of the interrib beam, lifting lugs are fixed on both sides of the interrib beam in step S1. The lifting lugs are pre-embedded in the interrib beam structure during the prefabrication process, and the material of the lifting lugs is cast iron or stainless steel.

[0015] In step S2, as one way to install the support device between the two arch ribs, the two ends of the support device are respectively installed on two embedded parts, and each of the embedded parts is pre-embedded on the side wall of the two arch ribs; the embedded parts include steel plates and embedded reinforcing bars, the embedded reinforcing bars are multiple and evenly distributed and fixed on the steel plates, the extension direction of each embedded reinforcing bar is perpendicular to the plane of the steel plate, the embedded reinforcing bars are pre-embedded in the arch ribs and welded and fixed to the arch rib reinforcing bars, and the steel plate is exposed on the outer surface of the side wall of the arch ribs.

[0016] Specifically, the embedded part needs to be pre-embedded in the arch rib sidewall before the concrete is poured, and the concrete is poured together with the arch rib. As the concrete solidifies, the embedded part is firmly fixed to the arch rib sidewall.

[0017] Preferably, in step S3, as one implementation of the position adjustment device, the position adjustment device includes a pulley and a chain. The pulley is fixedly installed on the support device, and the chain passes through the pulley for cooperating with the chain length adjustment device to move the crossbeam. One end of the chain is fixed with a connector for detachably connecting to the lug of the interrib crossbeam. The other end of the chain is fixedly connected to the chain length adjustment device.

[0018] The position adjustment device can be used to adjust the position of the crossbeam and stabilize the interrib crossbeam in the installation position. Specifically, the chain is a steel chain. The operation process of the position adjustment device is as follows: the prefabricated crossbeam is lifted by a crane to a location near the installation position and the support device; one end of the chain is detachably connected to the lifting lug of the interrib crossbeam; then the chain is passed through a pulley and fixed to the chain length adjustment device; then the chain length adjustment device drags or retracts the chain, slowly pulling the interrib crossbeam to the installation position; locking the chain length adjustment device keeps the chain taut and its length unchanged, thus stabilizing the interrib crossbeam in the installation position. The method of the position adjustment device assisting the movement and stabilization of the interrib crossbeam in the installation position is as follows: the prefabricated interrib crossbeam is lifted by a crane to a location near the support device, and the interrib crossbeam is transferred to the installation position by the position adjustment device; the position adjustment device then stabilizes the interrib crossbeam in the installation position.

[0019] As a preferred embodiment, the construction method and sequence for pouring concrete at the joint reinforcement location in step S4 are as follows:

[0020] S4.1 Weld the first joint reinforcement bars to the second joint reinforcement bars and ensure that the welding quality meets the engineering standard requirements;

[0021] S4.2 Erect a construction platform on the support device, install concrete pouring formwork at the joints, and fix the formwork.

[0022] S4.3. Pour joint concrete in the formwork to make the arch rib and the crossbeam between the ribs form a whole; at the same time, use water spraying to control the moisture of the concrete surface and cure it.

[0023] S4.4. After pouring concrete at the location of the butt joint reinforcement and allowing the concrete to solidify, dismantle the support device, construction platform, and position adjustment device.

[0024] As an improved design for the lifting lugs, four evenly and symmetrically distributed lifting lugs are fixed to the side of each of the interrib beams; four pulleys are correspondingly installed on the support device, each pulley through which a chain passes, and one end of each chain is fixed with a connector, which is detachably connected to each of the four lifting lugs; the other end of each chain is fixedly connected to different chain length adjustment devices; the lines connecting two opposite lifting lugs on each side of the interrib beam generate two intersection points, which are on the same straight line as the center of gravity of the interrib beam. This ensures that the interrib beam is vertical when lifted, without tilting, and is easier to align with the installation position on the arch rib; each of the four lifting lugs is connected to a chain length adjustment device via a chain, allowing the interrib beam to be adjusted at different tilt angles by varying the chain length at each point, making the position adjustment of the interrib beam more flexible.

[0025] As a preferred installation location for the support devices, one support device is installed on each of the arch ribs on both sides of the interrib beam, with the horizontal distance between the two support devices and the center of the interrib beam being equal. Each support device is equipped with four pulleys, each with a chain passing through it. One end of each chain is fixed with a connector, which is detachably connected to one of the four lifting lugs. The other end of each chain is fixedly connected to different chain length adjustment devices. The presence of position adjustment devices on both sides allows for simultaneous application of force to both sides of the interrib beam, resulting in a more stable and less prone-to-change position of the adjusted interrib beam. This enhances the supporting force between the arch ribs after the interrib beam is installed.

[0026] As one way to improve the accuracy of the installation position of precast beams, before proceeding to step S2, an infrared alignment device is installed on the inter-rib beams and the arch ribs. The infrared alignment device includes an infrared transmitter and an infrared receiver. An indicator light or a buzzer is installed on the infrared receiver. The infrared receiver can receive the infrared light emitted by the infrared transmitter. If the infrared light is aligned with the infrared receiver, the infrared receiver can provide an indicator light prompt or a buzzer prompt.

[0027] Specifically, the infrared emitting end is installed on the interrib beam or arch rib, and correspondingly, the infrared receiving end is installed on the arch rib or interrib beam.

[0028] In this way, if the rib beams that have been properly positioned shift, the construction workers can easily spot it and adjust their positions accordingly. This reduces the likelihood of the rib beams shifting due to environmental factors or equipment malfunctions, and improves the readiness of the installation.

[0029] As another way to improve the accuracy of the installation position of the precast inter-rib beam, in actual implementation, before step S4, an auxiliary structural support is built under the arch rib using the support device as a construction platform. The auxiliary structural support is a limiting member, which is fixedly connected to the second joint reinforcement. A limiting block is fixed on the limiting member. Two symmetrical positioning brackets are set at the bottom of the inter-rib beam. The two ends of each positioning bracket are fixedly connected to the first joint reinforcement on the side wall of the arch rib. The space between the two positioning brackets allows the limiting block to pass through, and when the inter-rib beam is in the installation position, the positioning bracket can support the bottom of the inter-rib beam. When the inter-rib beam moves to the installation position, the limiting block passes between the two positioning brackets and is restricted in the lateral direction by the positioning brackets, thus completing the auxiliary positioning function of the inter-rib beam.

[0030] The auxiliary structural support is used to provide auxiliary structural support for the interrib beam, making its position more stable and preventing displacement during joint reinforcement welding and concrete pouring to seal the joint. The auxiliary structural support can be a detachable scaffold or a welded steel plate structure support frame. After the joint concrete is poured and has initially solidified to a certain strength, the limiting parts and positioning brackets are gradually removed, so that the interrib beam can bear the load after installation and ultimately achieve an effective synergistic effect with the arch rib.

[0031] This invention has the following beneficial effects: It replaces on-site casting of crossbeams with precast arch rib crossbeams, and then uses supporting and adjusting devices to install the crossbeams in place. The supporting and adjusting devices work together effectively during installation, ensuring installation accuracy and reliability. This invention not only solves the problems of complex steps, large workload, and unchanging construction methods associated with on-site casting of arch rib crossbeams, but also improves the construction speed of crossbeams in concrete arch bridges. It effectively replaces the traditional methods of on-site rebar tying, formwork installation, and concrete pouring for crossbeams, saving labor, costs, and construction time, thereby reducing construction costs. It is safe, applicable, economical, and efficient. Furthermore, the use of precast crossbeams is not affected by arch rib casting, allowing for advance production and storage, and also provides assurance for the quality control of the crossbeams. Attached Figure Description

[0032] To make the objectives, technical solutions, and advantages of the invention clearer, the invention will now be described in further detail with reference to the accompanying drawings, wherein:

[0033] Figure 1 This is a schematic diagram showing the installation position of the prefabricated inter-rib crossbeam of the present invention.

[0034] Figure 2 This is a schematic diagram of the prefabricated interrib beam structure of the present invention.

[0035] Figure 3 This is a schematic diagram of the cross-sectional structure of the support device of the present invention.

[0036] Figure 4 This is a schematic diagram of the embedded part structure of the present invention.

[0037] Figure 5 For the present invention Figure 4 AA cross-section view.

[0038] Figure 6 This is a schematic diagram of the installation of the position adjustment device and support device of the present invention.

[0039] Figure 7 For the present invention Figure 6 Enlarged view of area B in the middle.

[0040] Figure 8 This is a schematic diagram of the installation position of the infrared alignment device of the present invention.

[0041] Figure 9 This is a schematic diagram of the installation position of the auxiliary structure support of the present invention.

[0042] Explanation of reference numerals in the attached drawings: 1. Arch rib; 11. First joint reinforcement; 2. Precast inter-rib crossbeam; 21. Second joint reinforcement; 22. Lifting lug; 3. Support device; 31. Embedded part; 32. Steel plate; 33. Embedded reinforcement; 34. Construction platform; 4. Position adjustment device; 41. Pulley; 42. Chain; 43. Chain length adjustment device; 44. Connector; 5. Infrared alignment device; 61. Limiting part; 62. Limiting block; 63. Positioning bracket; 7. Crane; 71. Lifting rope. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0044] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, 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 figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] This invention can be applied to the construction of concrete rib (box) arch bridges and stiffened frame concrete rib (box) arch bridges in the field of bridge construction, and solves the technical problem of slow construction progress and long construction period caused by the on-site casting method for the crossbeams between the arch ribs.

[0046] like Figure 1As shown, based on the above-mentioned technical problems, this invention discloses a method for rapid installation of crossbeams between ribs of a concrete arch bridge, comprising the following steps:

[0047] S1. Precast inter-rib crossbeam 2, used for structural support between two arch ribs 1 of an arch bridge. The arch rib 1 has an installation position for the inter-rib crossbeam. A first joint steel bar 11 extends from the installation position, and a second joint steel bar 21 extends from the beam end of the corresponding inter-rib crossbeam.

[0048] S2. Install a support device 3 between the two arch ribs 1 to provide temporary support for the two arch ribs 1.

[0049] S3. Install a position adjustment device 4 between the two arch ribs 1 to assist the interrib crossbeam in moving and stabilizing it in the installation position;

[0050] S4. Hoist the inter-rib beam to the installation position, weld the first joint steel bar 11 and the second joint steel bar 21, and pour concrete at the joint steel bar position to complete the connection between the precast inter-rib beam 2 and the two arch ribs 1.

[0051] In this design, the cross-section of the inter-rib crossbeam is rectangular. The beam ends of the inter-rib crossbeam refer to the two ends facing the sidewalls of the two arch ribs 1 after installation. The other two sides of the inter-rib crossbeam, excluding the beam ends, are the side surfaces of the inter-rib crossbeam, which are perpendicular to the planes of the sidewalls of the two arch ribs 1. This design uses prefabricated inter-rib crossbeams, which are prefabricated simultaneously in another location, unaffected by the casting progress of the arch ribs 1. After the arch ribs 1 are cast, the crossbeams can be quickly installed, requiring only concrete pouring at the joint between the arch ribs 1 and the inter-rib crossbeams. This completely replaces the on-site process of tying reinforcing bars, installing formwork, and pouring concrete for the crossbeams, significantly saving construction time for the bridge arch ribs 1. The support device 3 in this design can temporarily connect the separated arch ribs 1, serving as a temporary crossbeam and ensuring safety during the construction of the arch ribs 1, while also providing an operating platform for the installation of the crossbeams.

[0052] Specifically, in step S1, such as Figure 2 and Figure 8 As shown, there are multiple first joint reinforcement bars 11 and second joint reinforcement bars 21; the first joint reinforcement bar 11 protrudes from the side wall of the arch rib 1 and extends in a direction away from the side wall of the arch rib 1, and the second joint reinforcement bar 21 protrudes from the beam end face and extends in a direction away from the beam end face; when the inter-rib crossbeam is in the installation position, the first joint reinforcement bar 11 and the second joint reinforcement bar 21 can cross each other.

[0053] When the interrib crossbeam 2 is installed on the arch rib 1, the first joint steel bar 11 and the second joint steel bar 21 are welded and fixed.

[0054] In specific implementation, in order to facilitate the handling and hoisting of the interrib beam, as a structural improvement of the interrib beam, lifting lugs 22 are fixed on both sides of the interrib beam in step S1. The lifting lugs 22 are pre-embedded in the interrib beam structure during the prefabrication of the interrib beam 2, and the material of the lifting lugs 22 is cast iron or stainless steel.

[0055] During hoisting, a crane 7 is used, and a hoisting rope 71 is suspended from the boom of the crane 7. The hoisting rope 71 is tied to the lifting lug 22. After the hoisting is completed, the hoisting rope 71 is removed.

[0056] As an improvement to the lifting lugs 22, four lifting lugs 22 are fixed evenly and symmetrically distributed on the side of each of the interrib beams; the lines connecting the two opposite lifting lugs 22 on each side of the interrib beam generate two intersection points. These two intersection points are on the same straight line as the center of gravity of the interrib beam. This ensures that the interrib beam is vertical when it is lifted and does not tilt, making it easier to align with the mounting position on the arch rib 1.

[0057] Specifically, each lifting lug 22 is equipped with a lifting rope 71. By adjusting the length of the lifting rope 71, the interrib beam 2 can always be kept vertical when it is lifted, thus ensuring the accuracy of the installation of the interrib beam 2.

[0058] As one implementation of the support device 3, such as Figure 3 As shown, the support device 3 is a double-section I56 steel, which is fixedly connected by welding. The two ends of the steel are respectively welded to the steel plate 32 of the embedded part 31, so that the support device 3 can be installed between the two arch ribs 1.

[0059] In step S2, as one way to install the support device 3 between the two arch ribs 1, both ends of the support device 3 are respectively installed on two embedded parts 31, and each of the embedded parts 31 is pre-embedded in the side wall of the two arch ribs 1. Specifically, the embedded parts 31 need to be pre-embedded in the side wall of the arch rib 1 before the concrete is poured, and are poured together with the arch rib 1. As the concrete solidifies, the embedded parts 31 are firmly fixed to the side wall of the arch rib 1.

[0060] As one implementation method of the embedded part 31, such as Figure 4 and Figure 5 As shown, the embedded part 31 includes a steel plate 32 and embedded reinforcing bars 33. The embedded reinforcing bars 33 are multiple and evenly distributed and fixed on the steel plate 32. The extension direction of each embedded reinforcing bar 33 is perpendicular to the plane of the steel plate 32. The embedded reinforcing bars 33 are embedded in the arch rib 1 and welded to the reinforcing bars of the arch rib 1. The steel plate 32 is exposed on the outer surface of the side wall of the arch rib 1.

[0061] Regarding the implementation of the aforementioned embedded part 31, the two ends of the support device 3 are respectively welded to the steel plate 32 of the embedded part 31 to realize the installation of the support device 3. At this time, the two separate arch ribs 1 are spatially connected by the support device 3, which can serve as a temporary crossbeam and also as a construction channel for the installation of the crossbeam.

[0062] In step S3, as one implementation of the position adjustment device 4, such as Figure 6 and Figure 7 As shown, the position adjustment device 4 includes a pulley 41 and a chain 42. The pulley 41 is fixedly installed on the support device 3. The chain 42 passes through the pulley 41 and is used to cooperate with the chain length adjustment device 43 to move the crossbeam. One end of the chain 42 is fixed with a connector 44 for detachable connection with the lug 22 of the interrib crossbeam. The other end of the chain 42 is fixedly connected to the chain length adjustment device 43. The position adjustment device 4 can be used to adjust the position of the crossbeam and stabilize the interrib crossbeam in the installation position. Specifically, the chain 42 is a steel chain. The operation process of the position adjustment device 4 is as follows: the prefabricated crossbeam is lifted by the crane 7 to a position close to the installation position and the support device 3. One end of the chain 42 is detachably connected to the lifting lug 22 of the interrib crossbeam. Then, the chain 42 is passed through the pulley 41 and fixed to the chain length adjustment device 43. Then, the chain length adjustment device 43 drags or retracts the chain 42 and slowly pulls the interrib crossbeam to the installation position. The chain length adjustment device 43 is locked to keep the chain 42 taut and its length unchanged, so that the interrib crossbeam can be stably positioned at the installation position.

[0063] Specifically, the connector 44 is a detachable ring-shaped or hook-shaped structure. The connector 44 can adopt several common structures, but is not limited to the following: Ring-shaped connector, because it is ring-shaped, can be easily fitted onto the end of the chain and tightly fixed by pins or bolts. It has the characteristics of compact connection, convenient use, and strong heavy load capacity, and is often used in heavy load, high speed, and hanging applications; Hinged link is a structural component made by processing and welding chain links. It is widely used in heavy load industries such as lifting and traction. Its main advantages are high welding strength, good wear resistance, and long service life; Hook connector, i.e., hook, has the main advantages of being convenient and quick to install and disassemble.

[0064] Specifically, in step S3, the method by which the position adjustment device 4 assists the interrib beam in moving and stabilizing it in the installation position is as follows: the prefabricated interrib beam is hoisted to a position close to the support device 3 using a crane 7, and the interrib beam is transferred to the installation position by the position adjustment device 4, and the interrib beam is stabilized in the installation position by the restriction of the position adjustment device 4.

[0065] Specifically, in step S4, the construction method and sequence for pouring concrete at the joint reinforcement location are as follows:

[0066] S4.1 Weld the first joint steel bar 11 to the second joint steel bar 21, and ensure that the welding quality meets the engineering standard requirements;

[0067] S4.2 Erect a construction platform 34 on the support device 3, install concrete pouring formwork at the joint, and fix the formwork.

[0068] S4.3. Pour joint concrete in the formwork to make the arch rib 1 and the inter-rib crossbeam form an integral whole; at the same time, use water spraying to control the moisture level of the concrete surface and cure it to ensure that the concrete obtains sufficient strength and durability.

[0069] S4.4. After pouring concrete at the location of the butt joint reinforcement and allowing the concrete to solidify, dismantle the support device 3, construction platform 34, and position adjustment device 4.

[0070] For the case where four lifting lugs 22 are installed on the side of each interrib beam, four pulleys 41 are correspondingly installed on the support device 3. Each pulley 41 has a chain 42 passing through it, and one end of each chain 42 is fixed with a connector 44. The connector 44 is detachably connected to each of the four lifting lugs 22. The other end of each chain 42 is fixedly connected to a different chain length adjustment device 43. Each of the four lifting lugs 22 is connected to a chain length adjustment device 43 via a chain 42. This allows for different tilt angles of the interrib beam by adjusting the chain 42 at different points, making the position adjustment of the interrib beam more flexible.

[0071] As a preferred option for the installation position of the support device 3, one support device 3 is installed on each of the arch ribs 1 on both sides of the interrib beam, and the horizontal distance between the two support devices 3 and the center of the interrib beam is equal.

[0072] In the case where a support device 3 is installed on each of the arch ribs 1 on both sides of the inter-rib beam, four pulleys 41 are installed on each support device 3, and a chain 42 passes through each pulley 41. One end of each chain 42 is fixed with a connector 44, and the connector 44 is detachably connected to the four lifting lugs 22. The other end of each chain 42 is fixedly connected to different chain length adjustment devices 43.

[0073] Both sides are equipped with position adjustment devices 4, which can apply force to both sides of the interrib beam at the same time, thereby making the position of the adjusted interrib beam more stable and less prone to change, which helps to enhance the supporting force between the arch ribs 1 after the interrib beam is installed.

[0074] The chain length adjustment device 43 adopts one of the following: chain 42 winding and unwinding device, electric traction machine, flywheel type chain 42 winding and unwinding device, torsion spring type chain 42 winding and unwinding device, hydraulic chain 42 winding and unwinding device, winch, but is not limited to these listed chain length adjustment devices 43. All mechanical equipment that can realize the function of winding and unwinding chain 42 is within the scope of this solution.

[0075] Furthermore, according to the above scheme, the prefabricated inter-rib beam 2 can be quickly installed. However, the prefabricated inter-rib beam 2 is relatively heavy. During hoisting and positioning, although auxiliary positioning structures such as chain 42 are set up to stabilize the positioning of the inter-rib beam, the weight of the prefabricated inter-rib beam 2 is relatively large.

[0076] However, in severe weather, such as strong winds or typhoons, or if a chain length adjustment device 43 malfunctions, the inter-rib crossbeams may sway or swing continuously, leading to a technical problem where the precast inter-rib crossbeams 2, which have been properly adjusted, may shift in position. If the on-site construction personnel do not detect this in time, the installed inter-rib crossbeams may not be able to effectively support the arch ribs 1. Therefore, this invention also addresses the technical problem of the precast inter-rib crossbeams 2 shifting in installation position due to environmental factors or equipment malfunctions, in order to improve the accuracy of the inter-rib crossbeam installation position.

[0077] As one way to improve the accuracy of precast beam installation, such as Figure 8 As shown, before proceeding to step S2, an infrared alignment device 5 is installed on the interrib crossbeam and the arch rib 1. The infrared alignment device 5 includes an infrared transmitter and an infrared receiver. An indicator light or a buzzer is installed on the infrared receiver. The infrared receiver can receive the infrared light emitted by the infrared transmitter. If the infrared light is aligned with the infrared receiver, the infrared receiver can provide an indicator light prompt or a buzzer prompt.

[0078] Specifically, the infrared emitting end is installed on the interrib beam or arch rib 1, and correspondingly, the infrared receiving end is installed on the arch rib 1 or interrib beam.

[0079] In this way, if the rib beams that have been properly positioned shift, the construction workers can easily spot it and adjust their positions accordingly. This reduces the likelihood of the rib beams shifting due to environmental factors or equipment malfunctions, and improves the readiness of the installation.

[0080] As another way to improve the accuracy of the installation position of the precast inter-rib beam 2, in actual implementation, before step S4, the support device 3 is used as the construction platform 34, and an auxiliary structural support is built under the arch rib 1 to provide auxiliary structural support for the inter-rib beam, so that the position of the inter-rib beam is more stable and does not shift or deviate when the joint reinforcement is welded and the joint is sealed by the concrete pouring. The auxiliary structural support structure can be a detachable scaffold or a welded steel plate 32 structural support frame.

[0081] As one of the preferred implementation methods for auxiliary support structures, such as Figure 9 As shown, the auxiliary structural support is a limiting member 61, which is fixedly connected to the second joint reinforcement 21. A limiting block 62 is fixed on the limiting member 61. Two symmetrical positioning brackets 63 are set at the bottom of the interrib beam. The two ends of each positioning bracket 63 are fixedly connected to the first joint reinforcement 11 on the side wall of the arch rib 1. The space between the two positioning brackets 63 allows the limiting block 62 to pass through. When the interrib beam is in the installation position, the positioning bracket 63 can support the bottom of the interrib beam. When the interrib beam moves to the installation position, the limiting block 62 passes between the two positioning brackets 63 and is restricted from moving in the lateral direction by the positioning brackets 63, thus completing the auxiliary positioning function of the interrib beam. After the joint concrete is poured and initially solidified to a certain strength, the limiting member 61 and the positioning bracket 63 are gradually removed so that the interrib beam can bear the load in the installed state and finally achieve an effective synergistic effect with the arch rib 1.

[0082] Specifically, the positioning bracket 63 is an angle steel, which is welded and fixed to the first joint steel bar 11; the limiting member 61 is a steel bar; the limiting block 62 is an iron block; the limiting member 61 is welded and fixed to the iron block; and the limiting member 61 is welded and fixed to the second joint steel bar 21.

[0083] The function of the limiting member 61 is to prevent the inter-rib crossbeam from exceeding the designed position range during installation. It can position and control the movement of the inter-rib crossbeam, limit its positional deviation, and provide auxiliary means for the accuracy of the installation position of the inter-rib crossbeam. When the limiting member 61 and the position adjustment device 4 are used together, they can work together to ensure the accuracy of the installation of the inter-rib crossbeam.

[0084] After installing the precast inter-rib crossbeam 2 and welding the pre-reserved reinforcing bars on the crossbeam to the pre-reserved reinforcing bars on the arch rib 1, structural support is still required for the inter-rib crossbeam. This is because the welding process may generate certain stress and deformation in the inter-rib crossbeam. Furthermore, the weight of the crossbeam itself and the load it bears must be considered during the overall construction phase of the arch bridge. Therefore, appropriate structural support measures are necessary to ensure the stability and safety of the crossbeam.

[0085] In existing technologies, the construction of the inter-rib beams between the arch ribs of arch bridges using the traditional method of cast-in-place concrete is relatively slow, mainly due to the following reasons: Traditional construction methods require multiple steps on-site, such as formwork erection, steel bar processing, and concrete pouring, resulting in a long construction period, a large workload, and a significant investment of manpower, materials, and time; Traditional construction methods require operation in relatively complex environments such as under the arch bridge, making construction more difficult and demanding higher technical skills from construction personnel; Cast-in-place concrete requires a certain period of curing after pouring to reach the specified strength and stability, and the curing time is relatively long, resulting in a long overall construction period.

[0086] Compared to the traditional method of constructing the interrib beams between the arch ribs of an arch bridge using cast-in-place concrete, the rapid installation method for concrete arch bridge interrib beams disclosed in this invention utilizes precast interrib beams directly installed onto the arch ribs, resulting in faster construction. This is because the precast interrib beams can be prefabricated in a factory, reducing on-site processing time and steps, and avoiding the curing time required for on-site concrete pouring, thus shortening the overall construction cycle. Furthermore, the precast interrib beams have higher processing precision, reducing errors and lowering the difficulty of on-site processing and the technical requirements for personnel. Therefore, using precast interrib beams directly installed onto the arch ribs offers many advantages over traditional methods, including faster construction progress, lower construction difficulty, and more controllable quality.

[0087] Although the joints between the precast rib beams and the arch ribs also require on-site formwork and cast-in-place concrete, these steps also consume time and incur certain costs. However, compared to traditional construction methods, the precast rib beams can be mass-produced in a factory, shortening the on-site construction cycle and reducing processing difficulty and personnel technical requirements. Furthermore, it avoids the long curing time associated with cast-in-place concrete. Therefore, although the joints between the precast rib beams and the arch ribs still require on-site formwork and cast-in-place concrete, the method of directly installing the precast rib beams onto the arch ribs still offers a faster construction progress.

[0088] The rapid installation method for the crossbeams between the ribs of a concrete arch bridge disclosed in this invention has the following technical advantages: For this solution, the installation of the precast crossbeams between the ribs is a key challenge. Ensuring the correct and accurate installation of the precast crossbeams in their positions is also a technical problem that needs to be addressed simultaneously. This invention replaces the on-site casting of crossbeams with precast arch crossbeams between the ribs, and then uses support devices and position adjustment devices to install the crossbeams into place. The support devices and position adjustment devices work together effectively during the installation process, ensuring installation accuracy and reliability.

[0089] This invention not only solves the problems of complex, labor-intensive, and unchanging construction procedures for on-site casting of crossbeams between arch ribs, but also improves the construction speed of crossbeams between arch ribs in concrete arch bridges. It effectively replaces the traditional methods of on-site rebar tying, formwork installation, and concrete pouring for crossbeams, saving labor, costs, and construction time, thereby reducing construction costs. It is safe, applicable, economical, and efficient. Furthermore, the prefabricated crossbeam method is unaffected by the casting of the arch ribs, allowing for advance production and storage, and also provides assurance for the quality control of the crossbeams.

[0090] The present invention also discloses an auxiliary structural support structure, which can ensure the positional stability of the precast beam when welding the steel bars at the end of the precast beam to the steel bars reserved on the arch rib, reduce the frequency or amount of its positional offset, and ensure the accurate installation of the beam.

[0091] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Under the teachings of the present invention, modifications can be made to these features and embodiments to adapt to specific situations and materials without departing from the spirit and scope of the invention. The embodiments described in this invention are only a part of the embodiments of the invention, not all of them. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. Therefore, the invention is not limited to the specific embodiments disclosed herein, and all other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A rapid construction method for installing the crossbeams between the ribs of a concrete arch bridge, characterized in that, Includes the following steps: S1. A precast inter-rib crossbeam is used for structural support between two arch ribs of an arch bridge. The arch rib has an installation position for the inter-rib crossbeam. A first joint steel bar extends from the installation position, and a second joint steel bar extends from the beam end of the corresponding inter-rib crossbeam. S2. Install a support device between the two arch ribs to provide temporary support for the two arch ribs; in step S2, the two ends of the support device are respectively installed on two embedded parts, and each of the embedded parts is pre-embedded on the side wall of the two arch ribs; the embedded parts include steel plates and embedded reinforcing bars, the embedded reinforcing bars are multiple and evenly distributed and fixed on the steel plates, the extension direction of each embedded reinforcing bar is perpendicular to the plane of the steel plate, the embedded reinforcing bars are pre-embedded in the arch ribs and welded and fixed to the arch rib reinforcing bars, and the steel plate is exposed on the outer surface of the side wall of the arch ribs; S3. Install a position adjustment device between the two arch ribs to assist the inter-rib crossbeam in moving and stabilizing it in the installation position; S4. Hoist the inter-rib beam to the installation position, weld the first joint reinforcement bar and the second joint reinforcement bar, and pour concrete at the joint reinforcement bar position to complete the connection between the precast inter-rib beam and the two arch ribs.

2. The rapid construction method for installing the crossbeams between the ribs of a concrete arch bridge according to claim 1, characterized in that, In step S1, there are multiple first joint reinforcement bars and multiple second joint reinforcement bars; the first joint reinforcement bar protrudes from the side wall of the arch rib and extends in a direction away from the side wall of the arch rib, and the second joint reinforcement bar protrudes from the end face of the beam and extends in a direction away from the end face of the beam; when the inter-rib crossbeam is in the installation position, the first joint reinforcement bar and the second joint reinforcement bar can cross each other.

3. The rapid construction method for installing the crossbeams between the ribs of a concrete arch bridge according to claim 2, characterized in that, The two sides of the interrib beam described in step S1 are respectively fixed with lifting lugs.

4. The rapid construction method for installing the crossbeams between the ribs of a concrete arch bridge according to claim 3, characterized in that, In step S3, the position adjustment device includes a pulley and a chain. The pulley is fixedly installed on the support device, and the chain passes through the pulley to move the crossbeam in cooperation with the chain length adjustment device. One end of the chain is fixed with a connector for detachable connection with the lug of the interrib crossbeam. The other end of the chain is fixedly connected to the chain length adjustment device.

5. The rapid construction method for installing the crossbeams between the ribs of a concrete arch bridge according to claim 1 or 4, characterized in that, In step S4, the construction method and sequence for pouring concrete at the joint reinforcement location are as follows: S4.1 Weld the first joint reinforcement bars to the second joint reinforcement bars and ensure that the welding quality meets the engineering standard requirements; S4.2 Erect a construction platform on the support device, install concrete pouring formwork at the joints, and fix the formwork. S4.

3. Pour joint concrete in the formwork to make the arch rib and the crossbeam between the ribs form a whole; at the same time, use water spraying to control the moisture of the concrete surface and cure it. S4.

4. After pouring concrete at the location of the butt joint reinforcement and allowing the concrete to solidify, dismantle the support device, construction platform, and position adjustment device.

6. The rapid construction method for installing the crossbeams between the ribs of a concrete arch bridge according to claim 4, characterized in that, Each of the interrib beams has four evenly and symmetrically distributed lifting lugs fixed on its side; four pulleys are installed on the support device, each pulley has a chain passing through it, and one end of each chain is fixed with a connector, which is detachably connected to the four lifting lugs; the other end of each chain is fixedly connected to different chain length adjustment devices.

7. The rapid construction method for installing the crossbeams between the ribs of a concrete arch bridge according to claim 6, characterized in that, A support device is installed on each of the arch ribs on both sides of the interrib beam, and the horizontal distance between the two support devices and the center of the interrib beam is equal. Four pulleys are installed on each support device, and a chain passes through each pulley. One end of each chain is fixed with a connector, and the connector is detachably connected to the four lifting lugs. The other end of each chain is fixedly connected to different chain length adjustment devices.

8. The rapid construction method for installing the crossbeams between the ribs of a concrete arch bridge according to claim 1, characterized in that, Before proceeding to step S2, an infrared alignment device is installed on the interrib crossbeam and the arch rib. The infrared alignment device includes an infrared transmitter and an infrared receiver. An indicator light or a buzzer is installed on the infrared receiver. The infrared receiver can receive the infrared light emitted by the infrared transmitter. If the infrared light is aligned with the infrared receiver, the infrared receiver can provide an indicator light prompt or a buzzer prompt.

9. The rapid construction method for installing the crossbeams between the ribs of a concrete arch bridge according to claim 1, characterized in that, Before step S4 is implemented, using the support device as a construction platform, an auxiliary structural support is built under the arch rib. The auxiliary structural support is a limiting member, which is fixedly connected to the second joint reinforcement. A limiting block is fixed on the limiting member. Two symmetrical positioning brackets are set at the bottom of the interrib beam. The two ends of each positioning bracket are fixedly connected to the first joint reinforcement on the side wall of the arch rib. The space between the two positioning brackets allows the limiting block to pass through. When the interrib beam is in the installation position, the positioning bracket can support the bottom of the interrib beam. When the interrib beam is moved to the installation position, the limiting block passes between the two positioning brackets and is restricted in the lateral direction by the positioning brackets, thus completing the auxiliary positioning function of the interrib beam.

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