Reinforcing device for external prestressing tendons of hollow slab bridge

Abstract

The utility model relates to the technical field of bridge reinforcement, in particular to a reinforcing device for external prestressing tendons of a hollow slab bridge, which comprises a hollow slab bridge, the hollow slab bridge is composed of N longitudinally arranged hollow slabs, N is a positive integer larger than or equal to 4, a hinge joint is arranged between any two adjacent hollow slabs, and the hinge joint is connected with the hollow slabs. A plurality of arc-shaped transverse prestressed tendons distributed in the front-back direction are arranged below the hollow slab bridge, each transverse prestressed tendon comprises M bundles of steel strands, M is a positive integer larger than or equal to 3, and the two ends of each transverse prestressed tendon are anchored to the left side and the right side of the hollow slab bridge through anchoring assemblies respectively. The middle section of each transverse prestressed tendon is provided with P rhombic bracket assemblies; the problems that maintenance and repair are relatively difficult, the maintenance cost is high and the construction period is long due to large prestress loss in an existing external prestress reinforcing method for reinforcing and transforming the hollow slab bridge are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge reinforcement, in particular to a reinforcement device for external prestressed tendons of hollow slab bridges. Background Art

[0002] In the construction of highways and municipal roads, precast concrete hollow slab bridges are widely used due to their advantages of simple construction, high efficiency and low cost, and are often constructed in an assembled manner. In order to enable the hollow slab bridge to withstand the live load of vehicles, hinged joints are usually used to make the hollow slab bridge a whole. The forms of these hinged joints include circular, diamond and funnel shapes. However, under long-term use and overloading, hollow slab bridges often suffer from hinged joint damage, resulting in a decrease in the bearing capacity of the hollow slab bridge, and even a single-slab stress phenomenon, which causes the hollow slab bridge's force transmission performance to decline, and longitudinal cracks and other defects to appear, affecting the safety and durability of the hollow slab bridge.

[0003] At present, the existing method for strengthening and renovating hollow slab bridges is external prestressing reinforcement, but this reinforcement and renovation method has the following problems: with the long-term use of hollow slab bridges, the external prestressed tendons will gradually suffer from prestress loss, but it is relatively difficult to maintain and repair them. Especially when the prestressed tendons need to be replaced or adjusted, it may be necessary to dismantle the original structure and re-construct, which will bring about large maintenance costs and extended construction period.

[0004] Therefore, it is necessary to invent a reinforcement device for the external prestressed tendons of hollow slab bridges to solve the above problems. Utility Model Content

[0005] In order to solve the problems of relatively difficult maintenance and repair, high maintenance cost and long construction period caused by large prestress loss in the existing external prestressed reinforcement method for reinforcing and transforming hollow slab bridges, the utility model provides a reinforcement device for the external prestressed tendons of hollow slab bridges.

[0006] A reinforcing device for an external prestressed tendon of a hollow slab bridge, comprising a hollow slab bridge, the hollow slab bridge being composed of N hollow slabs arranged longitudinally, wherein N is a positive integer greater than or equal to 4, a hinged joint being arranged between any two adjacent hollow slabs, a plurality of arc-shaped transverse prestressed tendons distributed front and back being arranged below the hollow slab bridge, each transverse prestressed tendon comprising M bundles of steel strands, wherein M is a positive integer greater than or equal to 3, both ends of each transverse prestressed tendon are respectively anchored to the left and right sides of the hollow slab bridge through anchoring assemblies, a middle section of each transverse prestressed tendon is installed with P rhombus support assemblies, wherein P is a positive integer greater than or equal to 1 and less than or equal to N-3, and the positions of the P rhombus support assemblies correspond one-to-one to the positions of any P hinged joints among the remaining hinged joints except the first hinged joint on the left and the first hinged joint on the right in the hollow slab bridge;

[0007] Each anchor assembly includes an inverted L-shaped anchor plate, an anchor ring pad and a circular anchor ring. The two inverted L-shaped anchor plates at both ends of each transverse prestressed tendon are symmetrically installed on the left and right sides of the hollow slab bridge through expansion bolts Ⅰ. The lower end of each inverted L-shaped anchor plate exceeds the lower surface of the hollow slab bridge, and the outer surface of the part of each inverted L-shaped anchor plate exceeding the lower surface of the hollow slab bridge is provided with a through hole Ⅰ that matches the corresponding anchor ring pad. The tail of each anchor ring pad is inserted into the through hole Ⅰ of the corresponding inverted L-shaped anchor plate, and the inner surface of the head of each anchor ring pad is fitted to the outer surface of the corresponding inverted L-shaped anchor plate. Each circular anchor ring is provided with M through holes Ⅱ, and each circular anchor ring is fitted to the outer surface of the head of the corresponding anchor ring pad. The end of each transverse prestressed tendon is inserted into the corresponding anchor ring pad, and M strands of steel strands are correspondingly clamped in the M through holes Ⅱ of the corresponding circular anchor ring.

[0008] Each diamond-shaped support frame assembly includes a longitudinal vertical plate I, each longitudinal vertical plate I is embedded in the corresponding hinge joint, the lower surface of each longitudinal vertical plate I is integrally connected with a horizontal flat plate I, and each horizontal flat plate I is fixed to the lower surfaces of two hollow plates adjacent to the corresponding hinge joint by expansion bolts II. Each diamond-shaped support frame assembly also includes a scissor jack, the top seat of each scissor jack is integrally connected to the middle part of the lower surface of the corresponding horizontal flat plate I, and the base of each scissor jack is fixedly connected to its corresponding transverse prestressed tendon.

[0009] Furthermore, each transverse prestressed tendon is equipped with two steering assemblies, and the positions of the two steering assemblies of each transverse prestressed tendon correspond one by one to the positions of the first hinged joint on the left and the first hinged joint on the right in the hollow slab bridge; each steering assembly includes a longitudinal vertical plate II, each longitudinal vertical plate II is embedded in the corresponding hinged joint, the lower surface of each longitudinal vertical plate II is integrally connected with a horizontal flat plate II, each horizontal flat plate II is fixed to the lower surfaces of the two hollow slabs adjacent to the corresponding hinged joint by expansion bolts III, the lower surface of each horizontal flat plate II is integrally connected with a semicircular transverse vertical plate, the lower surface of each semicircular transverse vertical plate is provided with a steering groove adapted to the corresponding transverse prestressed tendon, and each transverse prestressed tendon is slidably connected in the corresponding steering groove.

[0010] Furthermore, the outer surface of each inverted L-shaped anchor plate that extends beyond the lower surface of the hollow slab bridge is provided with a fixing groove that is compatible with the corresponding anchor ring pad, and each through hole I is located in the fixing groove of the corresponding inverted L-shaped anchor plate, and each anchor ring pad is engaged with the corresponding fixing groove.

[0011] Furthermore, the lower surface of each horizontal flat plate I is integrally connected with two rectangular horizontal vertical plates which are symmetrical with respect to the scissor jack of the steering assembly.

[0012] Furthermore, an epoxy mortar leveling layer is provided between the upper surface of each horizontal flat plate I and the lower surfaces of the two hollow plates adjacent to the corresponding hinged joint, and between the upper surface of each horizontal flat plate II and the lower surfaces of the two hollow plates adjacent to the corresponding hinged joint.

[0013] Furthermore, the anchoring assembly, diamond support assembly, and steering assembly are all made of high-strength steel.

[0014] The utility model has a reasonable and reliable structural design, can timely supplement the prestress loss of the external prestressed tendons, effectively simplifies the later maintenance and repair work of the hollow slab bridge, is convenient to construct and simple to operate, not only shortens the construction period, but also effectively reduces the maintenance cost; at the same time, it increases the lateral connection between the hollow slabs in the hollow slab bridge, thereby further improving the bearing capacity of the hollow slab bridge and extending the service life of the hollow slab bridge; and it does not require large-scale traffic closure and does not damage the bridge deck pavement layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the anchoring assembly in the utility model.

[0017] Figure 3 yes Figure 1 A local enlarged schematic diagram of point A in the middle.

[0018] Figure 4 yes Figure 1 A local enlarged schematic diagram of point B in the middle.

[0019] Figure 5 It is a structural stereoscopic schematic diagram of the steering assembly in the utility model.

[0020] Figure 6 It is a structural side plan view of the steering assembly in the utility model.

[0021] Figure 7 It is a structural stereoscopic schematic diagram of a diamond-shaped support frame assembly in the utility model.

[0022] In the figure: 1-hollow slab, 2-hinge joint, 3-transverse prestressed tendons, 4-inverted L-shaped anchor plate, 5-anchor ring pad, 6-circular anchor ring, 7-expansion bolt Ⅰ, 8-through hole Ⅰ, 9-through hole Ⅱ, 10-longitudinal vertical plate Ⅰ, 11-horizontal flat plate Ⅰ, 12-expansion bolt Ⅱ, 13-scissor jack, 14-top seat, 15-base, 16-longitudinal vertical plate Ⅱ, 17-horizontal flat plate Ⅱ, 18-expansion bolt Ⅲ, 19-semicircular transverse vertical plate, 20-rectangular transverse vertical plate, 21-epoxy mortar leveling layer. DETAILED DESCRIPTION

[0023] A reinforcement device for external prestressed tendons of hollow slab bridges, as shown in the attached Figure 1 ~Attached Figure 2 , Attachment Figure 4 , Attachment Figure 7 As shown, it includes a hollow slab bridge, which is composed of N hollow slabs 1 arranged longitudinally, wherein N is a positive integer greater than or equal to 4, and a hinged joint 2 is arranged between any two adjacent hollow slabs 1, and a plurality of arc-shaped transverse prestressed tendons 3 distributed along the front and back are arranged below the hollow slab bridge, each transverse prestressed tendon 3 includes M bundles of steel strands, wherein M is a positive integer greater than or equal to 3, and both ends of each transverse prestressed tendon 3 are respectively anchored to the left and right sides of the hollow slab bridge through anchoring assemblies, and the middle section of each transverse prestressed tendon 3 is installed with P diamond support assemblies, wherein P is a positive integer greater than or equal to 1 and less than or equal to N-3, and the positions of the P diamond support assemblies correspond one-to-one to the positions of any P hinged joints 2 in the remaining hinged joints 2 except the first hinged joint 2 on the left and the first hinged joint 2 on the right in the hollow slab bridge;

[0024] Each anchor assembly includes an inverted L-shaped anchor plate 4, an anchor ring pad 5 and a circular anchor ring 6. The two inverted L-shaped anchor plates 4 at both ends of each transverse prestressed tendon 3 are symmetrically installed on the left and right sides of the hollow slab bridge through expansion bolts Ⅰ7. The lower end of each inverted L-shaped anchor plate 4 exceeds the lower surface of the hollow slab bridge, and the outer surface of the part of each inverted L-shaped anchor plate 4 that exceeds the lower surface of the hollow slab bridge is provided with a through hole Ⅰ8 that is compatible with the corresponding anchor ring pad 5. Each anchor ring pad The tail of the plate 5 is inserted into the through hole Ⅰ8 of the corresponding inverted L-shaped anchor plate 4, and the inner surface of the head of each anchor ring pad 5 is attached to the outer surface of the corresponding inverted L-shaped anchor plate 4, each circular anchor ring 6 is provided with M through holes Ⅱ9, and each circular anchor ring 6 is attached to the outer surface of the head of the corresponding anchor ring pad 5, the end of each transverse prestressed tendon 3 is inserted into the corresponding anchor ring pad 5, and the M strands of steel strands are clamped in the M through holes Ⅱ9 of the corresponding circular anchor ring 6 one by one;

[0025] Each diamond-shaped support frame assembly includes a longitudinal vertical plate Ⅰ10, each longitudinal vertical plate Ⅰ10 is embedded in the corresponding hinged joint 2, and the lower surface of each longitudinal vertical plate Ⅰ10 is integrally connected with a horizontal flat plate Ⅰ11, and each horizontal flat plate Ⅰ11 is fixed to the lower surfaces of two hollow plates 1 adjacent to the corresponding hinged joint 2 by expansion bolts Ⅱ12. Each diamond-shaped support frame assembly also includes a scissor jack 13, and the top seat 14 of each scissor jack 13 is integrally connected to the middle part of the lower surface of the corresponding horizontal flat plate Ⅰ11, and the base 15 of each scissor jack 13 is fixedly connected to its corresponding transverse prestressed tendon 3.

[0026] The structural design of the diamond support assembly in the utility model, on the one hand, plays a role in enhancing the overall structural stability of the hollow slab bridge by supporting the transverse prestressed tendons 3, and on the other hand, simplifies the later maintenance and repair work of the hollow slab bridge. When the prestress is lost, the prestressed tendons can be pushed downward by adjusting the scissor jack 13 to a certain distance, thereby supplementing the prestress loss of the external prestressed tendons to meet the design standard. The construction is convenient and the operation is simple, which not only shortens the construction period but also effectively reduces the maintenance cost. At the same time, the longitudinal vertical plate Ⅰ10 cooperates with the horizontal plate Ⅰ11 to effectively increase the lateral connection between the corresponding hollow slabs in the hollow slab bridge, thereby further improving the bearing capacity of the hollow slab bridge and extending the service life of the hollow slab bridge; the structural design of the anchor assembly provides anchor support for the reinforcement of the external prestress of the hollow slab bridge, fixes the transverse prestressed tendons 3 by the inverted L-shaped anchor plate 4 and the anchor ring pad 5, and keeps the transverse prestressed tendons 3 in an anchored state by the circular anchor ring 6, ensuring that the transverse prestressed tendons 3 are firmly connected to the hollow slab bridge structure to bear the role of prestress.

[0027] As attached Figure 1 , Attachment Figure 3 , Attachment Figure 5As shown, each transverse prestressed tendon 3 is equipped with two steering assemblies, and the positions of the two steering assemblies of each transverse prestressed tendon 3 correspond to the positions of the first hinged joint 2 on the left and the first hinged joint 2 on the right in the hollow slab bridge; each steering assembly includes a longitudinal vertical plate Ⅱ16, each longitudinal vertical plate Ⅱ16 is embedded in the corresponding hinged joint 2, the lower surface of each longitudinal vertical plate Ⅱ16 is integrally connected with a horizontal flat plate Ⅱ17, each horizontal flat plate Ⅱ17 is fixed to the lower surfaces of the two hollow slabs 1 adjacent to the corresponding hinged joint 2 through expansion bolts Ⅲ18, the lower surface of each horizontal flat plate Ⅱ17 is integrally connected with a semicircular transverse vertical plate 19, the lower surface of each semicircular transverse vertical plate 19 is provided with a steering groove adapted to the corresponding transverse prestressed tendon 3, and each transverse prestressed tendon 3 is slidably connected in the corresponding steering groove.

[0028] On the one hand, the structural design of the steering assembly provides effective support for the corresponding transverse prestressed tendons 3, ensuring that the corresponding transverse prestressed tendons 3 are correctly positioned in the hollow slab bridge; on the other hand, when the prestress of the corresponding transverse prestressed tendons 3 changes, thereby affecting the change of its curvature, the semicircular transverse vertical plate 19 can guide the corresponding transverse prestressed tendons 3 to slide in its steering groove, thereby reducing the longitudinal shear stress on the corresponding transverse prestressed tendons 3; in addition, the structural design of the longitudinal vertical plate II 16, the horizontal flat plate II 17, and the expansion bolts III 18 fixed to the lower surfaces of the two hollow slabs 1 adjacent to the corresponding hinge joints 2 further improves the lateral connection of the corresponding hollow slabs 1 in the hollow slab bridge.

[0029] As attached Figure 2 As shown, the outer surface of each inverted L-shaped anchor plate 4 that extends beyond the lower surface of the hollow slab bridge is provided with a fixing groove that is compatible with the corresponding anchor ring pad 5, and each through hole Ⅰ8 is located in the fixing groove of the corresponding inverted L-shaped anchor plate 4, and each anchor ring pad 5 is embedded in the corresponding fixing groove.

[0030] The structural design of the fixing groove ensures the firmness and stability of the transverse prestressed tendons 3 during anchoring, and prevents the position of the anchor ring pad 5 from being offset, thereby affecting the anchoring effect.

[0031] As attached Figure 4 , Attachment Figure 7 As shown, the lower surface of each horizontal flat plate Ⅰ11 is integrally connected with two rectangular horizontal vertical plates 20 which are symmetrical with respect to the scissor jack 13 of the steering assembly.

[0032] This structural design plays an auxiliary supporting role for the horizontal plate Ⅰ11, thereby improving the overall strength of the horizontal plate Ⅰ11.

[0033] As attached Figure 1 , Attachment Figure 3 ~Attached Figure 4As shown, an epoxy mortar leveling layer 21 is provided between the upper surface of each horizontal flat plate Ⅰ11 and the lower surfaces of the two hollow plates 1 adjacent to the corresponding hinged joint 2, and between the upper surface of each horizontal flat plate Ⅱ17 and the lower surfaces of the two hollow plates 1 adjacent to the corresponding hinged joint 2.

[0034] The epoxy mortar leveling layer 21 plays a leveling role, which is conducive to the seamless fitting of the horizontal plate I11 on the lower surfaces of the two hollow slabs 1 adjacent to the corresponding hinged joints 2, and the upper surface of the horizontal plate II17 and the lower surfaces of the two hollow slabs 1 adjacent to the corresponding hinged joints 2, thereby enhancing the connection stability between the diamond support assembly and the hollow slab bridge, and between the steering assembly and the hollow slab bridge.

[0035] The anchoring assembly, diamond support assembly and steering assembly are all made of high-strength steel.

[0036] The present invention is further described in detail below through specific embodiments. It should be noted that the present invention is not limited to the following embodiments.

[0037] In this embodiment, the number of the hollow slabs 1 is 7; each transverse prestressed tendon 3 includes 6 bundles of steel strands; and the number of the diamond-shaped support frame assemblies is 2.

[0038] The installation and use process of the utility model is achieved by the following steps:

[0039] Step 1: Install the transverse prestressed tendons 3, as shown in the attached Figure 1 As shown, a transverse prestressed tendon 3 is positioned below the hollow slab bridge formed by seven longitudinally arranged hollow slabs 1, and then the positions of the anchoring components at both ends of the transverse prestressed tendon 3 are positioned according to the positioning position of the transverse prestressed tendon 3. According to the positioning position of the anchoring components, two inverted L-shaped anchoring plates 4 are symmetrically installed on the left and right sides of the hollow slab bridge through expansion bolts Ⅰ7, and the lower end of each inverted L-shaped anchoring plate 4 exceeds the lower surface of the hollow slab bridge. Then, the transverse prestressed tendon 3 is passed through a corrugated tube and horizontally arranged at its positioning position below the hollow slab bridge, and its two ends are respectively passed through the corresponding In the through hole Ⅰ8 of the two inverted L-shaped anchor plates 4, an anchor ring pad 5 is sleeved on the end of the transverse prestressed tendon 3 located on the outside of each inverted L-shaped anchor plate 4, and each anchor ring pad 5 is inserted into the through hole Ⅰ8 of the corresponding inverted L-shaped anchor plate 4, and is engaged with the fixing groove of the corresponding inverted L-shaped anchor plate 4, and then a circular anchor ring 6 is sleeved on each end of the transverse prestressed tendon 3 located on the outside of each anchor ring pad 5, so that the 6 strands of steel wire at each end of the transverse prestressed tendon 3 are clamped in the 6 through holes Ⅱ9 of the corresponding circular anchor ring 6 one by one;

[0040] Step 2: Install the diamond support assembly, as shown in the attached Figure 1 , Attachment Figure 4As shown, a diamond support assembly is respectively installed at two hinged joints 2 located directly above the transverse prestressed tendon 3 and in the middle of the hollow slab bridge, and the longitudinal vertical plates Ⅰ10 of each prefabricated diamond support assembly are embedded in the corresponding hinged joints 2, and the horizontal flat plates Ⅰ11 of each prefabricated diamond support assembly are fixed to the lower surfaces of the two hollow slabs 1 adjacent to the corresponding hinged joints 2 through expansion bolts Ⅱ12, and the base 15 of each scissor jack 13 is fixedly connected to the transverse prestressed tendon 3 directly below it;

[0041] Step 3: Install the steering assembly, as shown in the attached Figure 1 , Attachment Figure 3 As shown, a steering assembly is respectively installed at the first hinged joint 2 on the left and the first hinged joint 2 on the right of the hollow slab bridge, just above the transverse prestressed tendon 3, and each prefabricated longitudinal vertical plate II 16 of the steering assembly is embedded in the corresponding hinged joint 2, and each prefabricated horizontal flat plate II 17 of the steering assembly is fixed to the lower surface of the two hollow slabs 1 adjacent to the corresponding hinged joint 2 by expansion bolts III 18, and the transverse prestressed tendons 3 are simultaneously slidably connected in the steering grooves of the two steering assemblies;

[0042] Step 4: Use the tensioning equipment to tension the transverse prestressed tendon 3, and adjust the diamond support assembly at the same time. By screwing the adjusting nut of the scissor jack 13, the base 15 pushes the transverse prestressed tendon 3 downward to a suitable position while the top seat 14 remains stationary, so as to ensure that the transverse prestressed tendon 3 reaches the prestress value required by the design;

[0043] Step 5: Repeat steps 1 to 4, and so on until the construction of the transverse prestressed tendons 3 of the entire hollow slab bridge is completed;

[0044] Step 6: When the transverse prestressed tendons 3 of the hollow slab bridge lose prestress and become loose, it is only necessary to adjust each diamond support assembly by screwing the adjusting nuts of each scissor jack 13, so that each scissor jack 13 can push the corresponding transverse prestressed tendons 3 downward to a suitable position while its top seat 14 remains stationary, thereby timely replenishing the prestress loss of each external prestressed tendon to meet the design requirements, and at the same time, each transverse prestressed tendon 3 slides in the steering groove of the corresponding steering assembly to reduce the longitudinal shear stress it receives;

[0045] Thus, the installation and use of the device is completed; the problems of the existing external prestressed reinforcement method for reinforcing and transforming hollow slab bridges, such as relatively difficult maintenance and repair due to large prestress loss, high maintenance cost and long construction period, are overcome.

[0046] During the specific implementation process, the anchor assembly, diamond support assembly and steering assembly are all treated with anti-corrosion treatment.

[0047] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reinforcement device for an external prestressed tendon of a hollow slab bridge, comprising a hollow slab bridge, wherein the hollow slab bridge is composed of N hollow slabs (1) arranged longitudinally, wherein N is a positive integer greater than or equal to 4, and a hinged joint (2) is arranged between any two adjacent hollow slabs (1), characterized in that: A plurality of arc-shaped transverse prestressed tendons (3) distributed along the front and rear are arranged below the hollow slab bridge, each transverse prestressed tendon (3) comprises M bundles of steel strands, wherein M is a positive integer greater than or equal to 3, both ends of each transverse prestressed tendon (3) are respectively anchored to the left and right sides of the hollow slab bridge through anchoring assemblies, and the middle section of each transverse prestressed tendon (3) is installed with P diamond-shaped support frame assemblies, wherein P is a positive integer greater than or equal to 1 and less than or equal to N-3, and the positions of the P diamond-shaped support frame assemblies correspond one-to-one to the positions of any P hinged joints (2) among the remaining hinged joints (2) in the hollow slab bridge except the first hinged joint (2) on the left and the first hinged joint (2) on the right; Each anchor assembly comprises an inverted L-shaped anchor plate (4), an anchor ring pad (5) and a circular anchor ring (6). The two inverted L-shaped anchor plates (4) at both ends of each transverse prestressed tendon (3) are symmetrically installed on the left and right sides of the hollow slab bridge through expansion bolts I (7). The lower end of each inverted L-shaped anchor plate (4) exceeds the lower surface of the hollow slab bridge, and the outer surface of the portion of each inverted L-shaped anchor plate (4) exceeding the lower surface of the hollow slab bridge is provided with a through hole I (8) adapted to the corresponding anchor ring pad (5). Each anchor ring pad (5 ) are inserted into the through hole I (8) of the corresponding inverted L-shaped anchor plate (4), and the inner surface of the head of each anchor ring pad (5) is attached to the outer surface of the corresponding inverted L-shaped anchor plate (4), each circular anchor ring (6) is provided with M through holes II (9), and each circular anchor ring (6) is attached to the outer surface of the head of the corresponding anchor ring pad (5), the end of each transverse prestressed tendon (3) is inserted into the corresponding anchor ring pad (5), and M bundles of steel strands are clamped in the M through holes II (9) of the corresponding circular anchor ring (6) in a one-to-one correspondence; Each rhombus support assembly comprises a longitudinal vertical plate I (10), each longitudinal vertical plate I (10) is embedded in a corresponding hinge joint (2), the lower surface of each longitudinal vertical plate I (10) is integrally connected with a horizontal flat plate I (11), each horizontal flat plate I (11) is fixed to the lower surfaces of two hollow plates (1) adjacent to the corresponding hinge joint (2) through expansion bolts II (12), each rhombus support assembly also comprises a scissor jack (13), the top seat (14) of each scissor jack (13) is integrally connected to the middle part of the lower surface of the corresponding horizontal flat plate I (11), and the base (15) of each scissor jack (13) is fixedly connected to its corresponding transverse prestressed tendon (3).

2. A reinforcement device for external prestressed tendons of hollow slab bridges according to claim 1, characterized in that: Each transverse prestressed tendon (3) is equipped with two steering assemblies, and the positions of the two steering assemblies of each transverse prestressed tendon (3) correspond to the positions of the first hinged joint (2) on the left and the first hinged joint (2) on the right in the hollow slab bridge; each steering assembly comprises a longitudinal vertical plate II (16), each longitudinal vertical plate II (16) is embedded in the corresponding hinged joint (2), the lower surface of each longitudinal vertical plate II (16) is integrally connected with a horizontal flat plate II (17), each horizontal flat plate II (17) is fixed to the lower surfaces of two hollow slabs (1) adjacent to the corresponding hinged joint (2) through expansion bolts III (18), the lower surface of each horizontal flat plate II (17) is integrally connected with a semicircular transverse vertical plate (19), the lower surface of each semicircular transverse vertical plate (19) is provided with a steering groove adapted to the corresponding transverse prestressed tendon (3), and each transverse prestressed tendon (3) is slidably connected in the corresponding steering groove.

3. The reinforcement device for external prestressed tendons of hollow slab bridges according to claim 1, characterized in that: The outer surface of each inverted L-shaped anchor plate (4) that exceeds the lower surface of the hollow slab bridge is provided with a fixing groove that matches the corresponding anchor ring pad (5), and each through hole I (8) is located in the fixing groove of the corresponding inverted L-shaped anchor plate (4), and each anchor ring pad (5) is fitted into the corresponding fixing groove.

4. The reinforcement device for external prestressed tendons of hollow slab bridges according to claim 2, characterized in that: The lower surface of each horizontal flat plate I (11) is integrally connected with two rectangular transverse vertical plates (20) which are symmetrical with respect to the scissor jack (13) of the steering assembly.

5. The reinforcement device for external prestressed tendons of hollow slab bridges according to claim 1, characterized in that: An epoxy mortar leveling layer (21) is provided between the upper surface of each horizontal flat plate I (11) and the lower surfaces of the two hollow plates (1) adjacent to the corresponding hinged joint (2), and between the upper surface of each horizontal flat plate II (17) and the lower surfaces of the two hollow plates (1) adjacent to the corresponding hinged joint (2).

6. The reinforcement device for external prestressed tendons of hollow slab bridges according to claim 2, characterized in that: The anchoring assembly, diamond support assembly and steering assembly are all made of high-strength steel.

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