CN-224227674-U - External prestressed reinforcement anchoring device for lower part of box girder bridge

Abstract

The utility model discloses an external prestressed reinforcement anchoring device for the lower part of a box girder bridge, which comprises external prestressed anchoring components distributed on two sides of a concrete box girder, wherein two groups of external prestressed anchoring components arranged along the length direction of the concrete box girder are fixedly connected through external prestressed reinforcements, an anchoring area is formed between the lower part of the concrete box girder and the external prestressed anchoring components, and the external prestressed reinforcements are arranged through the anchoring area. The external prestressed reinforcement anchoring device of the box Liang Qiaoxia part is more efficient, convenient and less in damage to the original structure, and can effectively improve the bearing capacity and durability of the box Liang Qiaoxia part structure, thereby having good economic and social benefits.

Inventors

• GAO JIAN
• QI QI
• PAN FUYUAN
• WANG QI
• Duan Shangze
• Liu Zhuoxu
• WANG YU
• Wei Jiangjiang
• LI GUODONG
• FAN LI
• GAO HAIBIN
• LI WEI
• WU LANTUOYA
• LI ZHIMIN
• GAO HAIZHI
• LUO XIN

Assignees

• 内蒙古交通集团蒙通养护有限责任公司
• 内蒙古大学

Dates

Publication Date

20260512

Application Date

20250523

Claims (8)

1. 1. The external prestressed tendon anchoring device for the lower part of the box girder bridge is characterized by comprising external prestressed anchoring assemblies (2) distributed on two sides of a concrete box girder (1), wherein the two groups of external prestressed anchoring assemblies (2) arranged along the length direction of the concrete box girder (1) are fixedly connected through external prestressed tendons (3), an anchoring area (4) is formed between the lower part of the concrete box girder (1) and the area between the external prestressed anchoring assemblies (2), and the external prestressed tendons (3) penetrate through the anchoring area (4).
2. 2. The external prestressed reinforcement anchoring device for the lower part of a box girder bridge according to claim 1, wherein prestressed anchor rods (11) are arranged between two groups of external prestressed anchor assemblies (2) arranged along the width direction of the concrete box girder (1), and two ends of each prestressed anchor rod (11) are respectively connected with the external prestressed anchor assemblies (2) at corresponding ends.
3. 3. The external prestressed tendon anchoring device at the lower part of a box girder bridge is characterized in that the external prestressed anchoring assembly (2) comprises an anchoring steel plate (6), an outer steel plate (7) and a limiting plate (15), wherein the anchoring steel plate (6) is arranged in the vertical direction, the anchoring steel plate (6) is connected with a web plate of the concrete box girder (1), the lower end of the anchoring steel plate (6) downwards extends out of the lower end of the concrete box girder (1), the limiting plate (15) is connected with the anchoring steel plate (6), the upper end face of the limiting plate (15) is abutted with the lower end face of the concrete box girder (1), anchoring steel plate lattice assemblies are distributed on the outer steel plate (7), and the outer steel plate (7) is connected with the anchoring steel plate (6) through the anchoring steel lattice assemblies.
4. 4. A box girder bridge lower part external prestressed tendon anchoring device according to claim 3, wherein the outer steel plate (7) is arranged in parallel with the anchoring steel plate (6).
5. 5. The external prestressed tendon anchoring device for the lower portion of a box girder bridge according to claim 4, wherein two ends of the prestressed anchor rods (11) respectively penetrate through the anchoring steel plates (6) and the outer steel plates (7) at the corresponding ends, and a lower base plate (13) and a fastening nut (12) are arranged at the end portions of the prestressed anchor rods (11).
6. 6. The external prestressed tendon anchoring device at the lower part of a box girder bridge according to claim 5, further comprising a force transmission steel plate (9), wherein the force transmission steel plate (9) is installed between two opposite surfaces of the anchoring steel plate (6) and the outer steel plate (7).
7. 7. An external tendon anchoring device at the lower part of a box girder bridge according to any one of claims 3 to 5, characterized by further comprising an abutting force transmission steel plate (5) and a lower anchor point steel plate (14) which are positioned below the concrete box girder (1), wherein one end of the abutting force transmission steel plate (5) is connected with the anchoring steel plate (6), the other end is connected with the lower anchor point steel plate (14), and the tendon (3) penetrates through the anchoring area (4) and is connected with the abutting force transmission steel plate (5).
8. 8. An external tendon anchor at a lower portion of a girder bridge as claimed in any one of claims 3 to 6, wherein said anchor steel plate cell assembly comprises transverse stiffening plates (8) and vertical stiffening plates (10) distributed on both sides of said outer steel plate (7), and said outer steel plate (7) is connected to said anchor steel plate (6) through the transverse stiffening plates (8) and the vertical stiffening plates (10).

Description

External prestressed reinforcement anchoring device for lower part of box girder bridge Technical Field The utility model relates to the technical field of box girder bridge construction, in particular to an external prestressed reinforcement anchoring device at the lower part of a box girder bridge. Background The box girder bridge is used as a very common bridge structural form in modern traffic infrastructure, and is widely applied to various traffic trunks by virtue of good mechanical properties and space utilization efficiency. However, during long-term service, the box girder bridge is continuously subjected to repeated actions of traffic load and influences of natural environments (such as temperature change, humidity erosion, chemical corrosion and the like), and problems such as crack initiation and propagation, excessive deflection and the like inevitably occur. The diseases seriously threaten the safety of the bridge structure, and obviously reduce the durability of the bridge structure, thereby affecting the normal use and the service life of the bridge. The external prestress reinforcement technology is taken as an effective means in the current bridge reinforcement field, and the stress performance of the structure can be obviously improved by applying prestress outside the box girder bridge structure. Specifically, the technology can effectively offset the tensile stress generated by constant load and live load, reduce the generation and development of cracks, and improve the rigidity of the bridge structure, thereby improving the bearing capacity and durability of the bridge. In addition, the external prestress reinforcement technology has the outstanding advantages of convenience in construction, small influence on traffic and the like, so that the external prestress reinforcement technology is widely applied and popularized in numerous box girder bridge reinforcement projects. Although the in-vitro prestress reinforcement technology has many advantages in the aspect of box girder bridge reinforcement, the existing in-vitro prestress reinforcement device and method still expose some problems to be solved in practical application. Among these, the complexity of the anchoring system is particularly pronounced. Conventional in vitro prestressing methods typically require drilling operations on the roof or web of the box girder bridge to install the anchor. The construction process is high in technical requirement and high in difficulty, and can inevitably cause larger damage to the original structure, so that the potential safety hazard of the structure is increased, and meanwhile, the aesthetic property and the durability of the bridge can be influenced. In addition, the complex anchoring system also leads to prolonged construction period and increased cost, and limits further development and application of the external prestress reinforcement technology. Therefore, developing an in-vitro prestress reinforcing device which is more efficient, convenient and has smaller damage to the original structure becomes an important research direction in the current bridge reinforcing field and a key problem to be solved urgently. Disclosure of utility model Aiming at the technical problems existing at present, the utility model provides an external prestressed tendon anchoring device at the lower part of a box girder bridge, which aims to solve the problems in the prior art. In order to achieve the above object, the present utility model provides the following technical solutions: The utility model provides a box girder bridge lower part external prestressing tendons anchor, includes the external prestressing tendons anchor assembly of distribution in concrete box girder both sides, follows between the external prestressing tendons fixed connection of two sets of external prestressing tendons that concrete box girder length direction set up, the concrete box girder below with the region between the external prestressing tendons anchor assembly forms the anchor district, external prestressing tendons passes this anchor district setting. Preferably, a prestressed anchor rod is arranged between two groups of external prestressed anchor assemblies arranged along the width direction of the concrete box girder, and two ends of the prestressed anchor rod are respectively connected with the external prestressed anchor assemblies at the corresponding ends. Preferably, the external prestressing force anchor subassembly includes anchor steel sheet, outside steel sheet and limiting plate, the anchor steel sheet sets up along vertical direction, the anchor steel sheet with the web of concrete box girder is connected, just the lower extreme of anchor steel sheet downwardly extending the lower extreme of concrete box girder, the limiting plate with the anchor steel sheet is connected, just the up end of limiting plate with the lower terminal surface butt of concrete box girder, it has anchor steel sheet check subassem