Assembly type replaceable plate girder hinge joint vertical shear-resistant reinforcing device and construction method

Abstract

According to the assembly type replaceable plate girder hinge joint vertical shear-resistant reinforcing device and the construction method, the two independent jacks are arranged on the reinforcing device bodies at the bottoms of hollow plate girders on the two sides of the hinge joint, through the synergistic effect of the two jacks, one jack device guarantees the fixing reliability, and the other jack device guarantees the fixing reliability; and the other jack device is used for adjusting the telescopic stroke, adjusting the vertical relative displacement of the adjacent hollow slab beams and accurately controlling the reinforcing displacement until the initial stress state of the adjacent hollow slab beam body structure is recovered, the reinforcing device has the assembly type characteristic and replaceability, the whole operation process is simple and convenient, and the construction and maintenance efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering maintenance and reinforcement technology, specifically to a prefabricated replaceable plate girder hinge joint vertical shear reinforcement device and construction method. Background Technology

[0002] In the field of transportation infrastructure construction such as highways and municipal projects, prefabricated hollow slab girder bridges have become the mainstream structural form for small and medium-span bridges due to their significant advantages such as high standardization of components, high efficiency of factory prefabrication, convenient on-site installation, and low project cost. They are widely used in urban and rural roads, expressway branches, and municipal bridge projects.

[0003] For prefabricated hollow slab girder bridges, the core of their structural stress lies in the hinge joints between adjacent slab girders. These hinge joints, acting as force transmission links between slab girders, must effectively transfer lateral shear force, ensuring that multiple independent slab girders form a collaborative force-bearing system. This achieves uniform lateral load distribution across the entire bridge width, thereby guaranteeing the overall load-bearing capacity and service safety of the bridge. However, engineering practice shows that hinge joints are a weak point in such bridges, highly susceptible to damage under long-term loads and environmental influences. Among these, the vertical relative displacement of the slab girders on both sides of the hinge joint (i.e., "misalignment") is the most typical and dangerous form of damage. Technological development in this field has evolved around how to manage and prevent this damage, primarily through the following stages: 1. Traditional passive maintenance stage Early methods primarily involved reinforcement with high-strength mortar or epoxy resin concrete, or pressure grouting. These methods could only restore part of the integrity of the hinge joint and could not fundamentally solve the problem of insufficient shear resistance. They were passive maintenance methods with limited effectiveness and poor durability.

[0004] 2. Overall reinforcement stage This stage aims to improve stress distribution by enhancing the overall structural integrity. This primarily includes adding a layer of reinforced concrete to the bridge deck or enlarging the cross-section of the hinge joint area, attempting to bond multiple beams into a single unit. While these methods can improve integrity to some extent, they have drawbacks such as large workload, prolonged traffic disruption, and a significant increase in structural weight. Additionally, bonding steel plates or carbon fiber fabric to the bridge deck or beam bottom in the hinge joint area has also been applied. This method utilizes the adhesive's bonding strength to improve shear strength; however, it heavily relies on the adhesive's performance, suffers from aging issues, and is a passive stress-bearing method, where stress is only generated when the beam deforms, resulting in low reinforcement efficiency. More importantly, almost all of these reinforcement methods are irreversible and permanent changes. Failure or replacement will cause secondary damage to the original structure, making repairs extremely difficult.

[0005] 3. Active reinforcement stage A representative method at this stage is to apply transverse prestress to the bridge deck or beam sides, actively "hooking" adjacent slabs and beams together with prestressed steel strands to generate positive pressure, thereby increasing the friction between the hinge joints and improving shear resistance. This method is highly effective and represents a significant technological advancement. However, traditional transverse prestressing technology still has shortcomings: such as relatively complex construction; difficulty in handling prestressed anchor points, which can damage the original structure; prominent long-term stress loss and corrosion problems, and once the prestressing system fails, repair and replacement are extremely difficult; it cannot achieve the goal of prefabricated and replaceable structures; it cannot adapt to the transverse tilt of the beam during the stress process during reinforcement; it cannot accurately control the specific displacement adjustment amount, and it cannot adjust the vertical relative displacement of adjacent hollow slab beams multiple times in the future. In the existing technology, CN222594644U discloses a reinforcement device for external prestressing tendons of hollow slab bridges. It provides support points through external prestressing tendons and provides a vertical force at the hinge position of the hollow slab beam. This vertical force acts on the adjacent hollow slabs on both sides of the hinge. This "overall lifting" mode is mainly used to prevent secondary relative displacement of hollow slab beams or to eliminate some of the relative displacement that has already occurred. Its core purpose is to tension or compensate for prestress loss. It is difficult to actively and accurately eliminate the existing vertical misalignment between the two slab beams and make asymmetrical and independent precise adjustments, so as to restore the hinge to the optimal initial stress state. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a prefabricated, replaceable, vertical shear reinforcement device for hinge joints of slab beams and a construction method thereof. This hinge joint reinforcement structure allows for precise control of the reinforcement displacement, is easy to construct, causes minimal damage to the original structure, and is convenient for inspection and maintenance.

[0007] The present invention achieves the above objectives through the following technical solutions: In a first aspect, the present invention provides an assembled replaceable plate beam hinge joint vertical shear reinforcement device, including an adjacent first plate beam and a second plate beam. A vertical through hole is provided at the hinge joint between the first plate beam and the second plate beam. A first irregular plate overlaps the top of the two plate beams and a protrusion on the first irregular plate is engaged with the top of the hinge joint. A through threaded hole is provided at the geometric center of the first irregular plate and aligned with the through hole. A first threaded rod passes through the through hole between the first irregular plate and the two plate beams hinge joint and exits from the bottom of the two plate beams hinge joint. The first threaded rod is threadedly connected to the first irregular plate. A first fastening nut is threadedly connected to the upper end of the first threaded rod and screwed to be close to the first irregular plate. After exiting, the first threaded rod passes into a second irregular plate with a through threaded hole at its geometric center. The long side of the second irregular plate is perpendicular to the longitudinal direction of the plate beam. A second fastening nut is threadedly connected to the lower end of the first threaded rod and screwed to be close to the second irregular plate. Jack devices are respectively provided at the bottom of the second irregular plate and the first plate beam.

[0008] Preferably, the jack device is a scissor jack, comprising a third irregular plate, accessories, two upper support arms, two lower support arms, two sleeves, a second threaded rod, and a base. Both ends of the two upper and two lower support arms have connecting holes. One end of each of the two upper support arms is connected to the connecting hole of the corresponding upper ear plate on the outer wall of the sleeve by a bolt passing through the connecting hole at that end, and then rotated with a nut. The other end of each of the two upper support arms is connected to the connecting hole of the upper support arm by a bolt passing through the connecting hole at that end and the connecting hole of the bottom ear plate of the accessory, and then rotated with a nut. The lower ear plates on the outer walls of the two sleeves are rotatably connected to one end of their corresponding lower support arms by bolts and nuts. The other ends of the two lower support arms are rotatably connected to the base by bolts and nuts. The second threaded rod passes through the two sleeves sequentially along its axial direction, and the second threaded rod and the two sleeves are threadedly engaged. One end of the second threaded rod is fixedly equipped with an adjustment knob. The range adjustment knob is used to drive the second threaded rod to rotate around its axis, thereby causing the two sleeves to move closer or further apart relative to each other along the axial direction of the second threaded rod, thus causing the scissor structure formed by the two upper support arms and the two lower support arms to expand or contract. The geometric center of the third irregular plate is provided with a protruding hemisphere, and a hemispherical hole is provided at the top of the accessory. The third irregular plate and the accessory form a ball joint connection.

[0009] Preferably, rubber plates are provided between the first irregular plate and the first plate beam, and between the first irregular plate and the second plate beam. The rubber plates are used to accommodate small vertical and horizontal deformations that may exist between the irregular plate and the plate beam.

[0010] Preferably, the irregularly shaped plate and the jack device are both made of high-strength steel.

[0011] Secondly, the present invention provides a method for constructing a prefabricated replaceable plate beam hinge joint vertical shear reinforcement, which is carried out according to the following steps: S1. Install the prefabricated replaceable plate beam hinge joint vertical shear reinforcement device as described above between two adjacent plate beams that need reinforcement. S2. Control the lifting and lowering of the jack device by rotating the second threaded rod in the jack device at the bottom of the first plate beam, so that it abuts against the bottom of the first plate beam and one side of the second irregular plate. S3. Control the lifting and lowering of the jack device by rotating the second threaded rod in the jack device at the bottom of the second plate beam, so that it abuts against the bottom of the second plate beam and the other side of the second irregular plate. S4. Continue to rotate the second threaded rod in the jack device at the bottom of the second beam to adjust the lifting distance of the jack device, so as to achieve vertical shear reinforcement between the two beams and eliminate the vertical relative displacement between them.

[0012] The beneficial effects of this invention are: 1. It enables the assembly and replacement of reinforcement devices, is easy to operate, and solves the durability problem of reinforcement devices; 2. For issues of excessive local relative displacement, local vertical shear reinforcement can be carried out at the hinge joints of adjacent beams; 3. Through the coordinated action of the two jacks at the bottom of the device, the vertical shear reinforcement of the local area of ​​the adjacent beam can be precisely achieved, the reinforcement displacement can be precisely controlled, and the initial stress state of the adjacent hollow slab beam structure can be restored. 4. The two jacks at the bottom of the device can be operated to adjust and control the vertical relative displacement of adjacent beams multiple times in the later stages, so that the hollow slab beam structure always maintains the initial stress state. 5. By using the rubber plate set on the top of the beam and the ball joint device on the jack, the beam's lateral tilt angle can be adapted to changes during the reinforcement process. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a three-dimensional view of the overall structure of the present invention. Figure 3 This is a schematic diagram of the vertical connecting device structure; Figure 4 for Figure 1 Enlarged and exploded views of the jack device at point A in the middle section; Reference numerals: 1. First plate beam; 2. Second plate beam; 3. First threaded rod; 4. Rubber plate; 5. First irregular plate; 6. First fastening nut; 7. Second irregular plate; 8. Second fastening nut; 9. Upper support arm; 10. Lower support arm; 11. Accessory; 12. Second threaded rod; 13. Sleeve; 14. Base; 15. Third irregular plate. Detailed Implementation

[0014] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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 this invention.

[0015] Example 1:

[0016] like Figure 1-4The present invention relates to a prefabricated replaceable plate beam hinge joint vertical shear reinforcement device, comprising an adjacent first plate beam 1 and a second plate beam 2. A vertical through hole is provided at the hinge joint between the first plate beam 1 and the second plate beam 2. A first irregular plate 5 overlaps the top of the two plate beams and the protrusion on the first irregular plate 5 is inserted into the top of the hinge joint. Rubber plates 4 are provided between the first irregular plate 5 and the first plate beam 1, and between the first irregular plate 5 and the second plate beam 2. The rubber plates are used to accommodate the small vertical and horizontal deformations that may exist between the irregular steel plate 5 and the plate beam. The first irregular plate 5 has a through threaded hole at its geometric center and is aligned with the through hole. The first threaded rod 3 passes through the through hole between the first irregular plate 5 and the hinge joint between the two plate beams, and exits from the bottom of the hinge joint between the two plate beams. The first threaded rod 3 is threadedly connected to the first irregular plate 5. The upper end of the first threaded rod 3 is threadedly connected to the first fastening nut 6, which is screwed until it is close to the first irregular plate 5. After exiting, the first threaded rod 3 passes into the second irregular plate 7, which has a through threaded hole at its geometric center. The long side of the second irregular plate 7 is perpendicular to the longitudinal direction of the plate beam. The lower end of the first threaded rod 3 is threadedly connected to the second fastening nut 8, which is screwed until it is close to the second irregular plate 7. Jack devices are respectively provided at the bottom of the second irregular plate 7 and the first plate beam 1, and at the bottom of the second irregular plate 7 and the second plate beam 2.

[0017] The jack device is a scissor jack, comprising a third irregular plate 15, an accessory 11, two upper support arms 9, two lower support arms 10, two sleeves 13, a second threaded rod 12, and a base 14. Both ends of the two upper support arms 9 and the two lower support arms 10 have connecting holes. One end of each upper support arm 9 is connected to the connecting hole of the corresponding sleeve 13 by bolts passing through the connecting hole at that end, and then rotated with a nut. The other end of each upper support arm 9 is connected to the connecting hole of the corresponding sleeve 13 by bolts passing through the connecting hole at that end and the connecting hole of the bottom ear plate of the accessory 11, and then rotated with a nut. The outer walls of the two sleeves 13... The lower ear plates are rotatably connected to one end of their corresponding lower support arms 302 via bolts and nuts. The other ends of the two lower support arms 10 are rotatably connected to the base 14 via bolts and nuts. The second threaded rod 12 passes through the two sleeves 13 sequentially along its axial direction, and the second threaded rod 12 and the two sleeves 13 are threadedly engaged. One end of the second threaded rod 12 is fixedly provided with an adjustment knob, which is used to drive the second threaded rod to rotate around its axis, causing the two sleeves to move closer or further apart along the axial direction of the second threaded rod, thereby causing the scissor structure formed by the two upper support arms and the two lower support arms to expand or contract. The geometric center of the third irregular plate 15 is provided with a protruding hemisphere, and a hemispherical hole is provided at the top of the accessory 11. The third irregular plate 15 and the accessory 11 form a ball joint connection. The first irregular plate 5, the second irregular plate 7, the third irregular plate 15, and the jack device are all made of high-strength steel.

[0018] This embodiment provides a construction method for vertical shear reinforcement of the hinge joint of a prefabricated replaceable slab beam. The method employs the aforementioned prefabricated replaceable slab beam hinge joint vertical shear reinforcement device and proceeds according to the following steps: S1. Install the prefabricated replaceable plate beam hinge joint vertical shear reinforcement device between the adjacent first plate beam 1 and second plate beam 2 that need to be reinforced. S2. Control the lifting and lowering of the jack device by rotating the second threaded rod 12 in the jack device at the bottom of the first plate beam 1, so that it abuts against the bottom of the first plate beam 1 and one side of the second irregular plate 7. S3. Control the lifting and lowering of the jack device by rotating the second threaded rod 12 in the jack device at the bottom of the second plate beam 2, so that it abuts against the bottom of the second plate beam 2 and the other side of the second irregular plate 7. S4. Continue rotating the second threaded rod 12 in the jack device at the bottom of the second beam 2 to adjust the lifting distance of the jack device. Through the coordinated action of the two jack devices, the first jack, through its lifting force, reliably anchors the entire reinforcement device to one of the beams, thus providing a stable support platform for the second jack used for adjustment. The second jack then uses this platform as a base point to independently apply its lifting force to the bottom surface of the other beam. The ball joint structure on the jack device can adapt to the lateral tilt of the hollow beam under stress, ensuring uniform stress on the bottom of the hollow beam during reinforcement. Through the coordinated operation of the two jacks, vertical shear reinforcement between the two beams is achieved, eliminating the vertical relative displacement between them, thereby effectively eliminating existing misalignment defects.

[0019] This invention is not limited to the above embodiments. Based on the technical solutions disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. A prefabricated replaceable plate beam hinge joint vertical shear reinforcement device, comprising adjacent first plate beam 1 and second plate beam 2, characterized in that: A vertical through hole is provided at the hinge joint between the first plate beam 1 and the second plate beam 2. The first irregular plate 5 overlaps the top of the two plate beams and the protrusion on the first irregular plate 5 is engaged with the top of the hinge joint. A through threaded hole is provided at the geometric center of the first irregular plate 5 and is aligned with the through hole. The first threaded rod 3 passes through the through hole between the first irregular plate 5 and the two plate beams hinge joint and exits from the bottom of the two plate beams hinge joint. The first threaded rod 3 is threadedly connected to the first irregular plate 5. The upper end of the first threaded rod 3 is threadedly connected to the first fastening nut 6 and screwed until it is close to the first irregular plate 5. After exiting, the first threaded rod 3 passes into the second irregular plate 7, which has a through threaded hole at its geometric center. The long side of the second irregular plate 7 is perpendicular to the longitudinal direction of the plate beam. The lower end of the first threaded rod 3 is threadedly connected to the second fastening nut 8 and screwed until it is close to the second irregular plate 7. Jack devices are respectively provided at the bottom of the second irregular plate 7 and the first plate beam 1, and at the bottom of the second irregular plate 7 and the second plate beam 2.

2. The prefabricated replaceable plate beam hinge joint vertical shear reinforcement device according to claim 1, characterized in that: The jack device is a scissor jack, comprising a third irregular plate 15, an accessory 11, two upper support arms 9, two lower support arms 10, two sleeves 13, a second threaded rod 12, and a base 14. Both ends of the two upper support arms 9 and the two lower support arms 10 have connecting holes. One end of each of the two upper support arms 9 is connected to the connecting hole of the corresponding upper ear plate on the outer wall of the sleeve 13 by bolts, and then rotated with nuts. The other end of each of the two upper support arms 9 is connected to the connecting hole of the corresponding upper support arm 9 by bolts passing through the connecting hole of the upper support arm 9 and the connecting hole of the bottom ear plate of the accessory 11, and then rotated with nuts. The lower outer wall lugs of the two sleeves 13 are rotatably connected to one end of their corresponding lower support arms 302 by bolts and nuts. The other ends of the two lower support arms 10 are rotatably connected to the base 14 by bolts and nuts. The second threaded rod 12 passes through the two sleeves 13 in sequence along its axial direction, and the second threaded rod 12 and the two sleeves 13 are threaded together. One end of the second threaded rod 12 is fixedly provided with an adjustment knob. The geometric center of the third irregular plate 15 is provided with a protruding hemisphere, and a hemispherical hole is provided on the top of the accessory 11. The third irregular plate 15 and the accessory 11 form a ball joint connection.

3. The prefabricated replaceable plate beam hinge joint vertical shear reinforcement device according to claim 2, characterized in that: Rubber plates 4 are provided between the first irregular plate 5 and the first plate beam 1, and between the first irregular plate 5 and the second plate beam 2.

4. The prefabricated replaceable plate beam hinge joint vertical shear reinforcement device according to claim 3, characterized in that... The first irregular plate 5, the second irregular plate 7, the third irregular plate 15, and the jack device are all made of high-strength steel.

5. A method for constructing vertical shear reinforcement of hinge joints in prefabricated replaceable slab beams, characterized in that, The prefabricated replaceable plate beam hinge joint vertical shear reinforcement device as described in any one of claims 1-4 is adopted and carried out according to the following steps: S1. Install the prefabricated replaceable plate beam hinge joint vertical shear reinforcement device between two adjacent plate beams that need reinforcement. S2. Rotate the second threaded rod 12 in the jack device at the bottom of the first plate beam 1 to control the lifting and lowering of the jack device, so that it abuts against the bottom of the first plate beam 1 and one side of the second irregular plate 7. S3. Rotate the second threaded rod 12 in the jack device at the bottom of the second plate beam 2 to control the lifting and lowering of the jack device, so that it abuts against the bottom of the second plate beam 2 and the other side of the second irregular plate 7. S4. Continue to rotate the second threaded rod 12 in the jack device at the bottom of the second plate beam 2, and adjust the lifting distance of the jack device to achieve vertical shear reinforcement between the two plate beams and eliminate the vertical relative displacement between them.

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