Anchoring device for external prestressing reinforcement of bridge without damaging beam body

Abstract

The invention discloses an anchoring device for external prestressing reinforcement of a bridge without damaging a beam body, and relates to the technical field of bridge engineering, the anchoring device comprises a concrete T-shaped beam, the two ends of the concrete T-shaped beam are fixedly connected with external prestressing anchoring assemblies respectively, and the external prestressing anchoring assemblies are fixedly connected through external prestressing tendons. According to the anchoring device for external prestressing reinforcement of the bridge without damaging the beam body, drilling and steel bar planting on the existing bridge body are not needed, the beam body is not damaged, the construction speed is high, and stress is clear.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to an anchoring device for external prestressed reinforcement of a bridge without damaging a beam body. Background Art

[0002] Since the 1990s, reinforced concrete T-beams and prestressed concrete T-beams have been widely used in highway and railway bridges. The Ministry of Transport and many design institutes have issued general structural design drawings to promote the development of concrete T-beam bridges. Compared with steel bridges and steel-concrete composite structure bridges, reinforced concrete T-beams and prestressed concrete T-beam bridges have the advantages of low construction cost and high technical maturity. Especially in the large-scale construction of bridges on highways or railways, the ability to use factory prefabrication and on-site assembly construction makes them highly competitive when comparing schemes.

[0003] With the continuous development of the economy and society, the reinforced concrete T-beam and prestressed concrete T-beam bridges built with old specifications in the early days have become increasingly problematic in recent years due to problems such as low design loads or poor construction quality at the time. In order to meet the demand for continued growth in traffic volume, the number of highway reconstruction and expansion projects has continued to increase in recent years. In order to solve the construction cost problem, it is very necessary to reinforce and transform T-beam bridges with insufficient bearing capacity to adapt them to the new traffic load requirements.

[0004] The external prestressing reinforcement method is one of the commonly used reinforcement methods in bridge engineering. The prestressing can be achieved by using traditional prestressed steel strands or lightweight and high-strength carbon fiber plates. Compared with other reinforcement methods, the external prestressing reinforcement method can simultaneously improve the stiffness and bearing capacity of existing bridges, and is a very effective reinforcement method. In order to transfer the prestressing effect of the external prestressing to the T-beam, it is necessary to install an external prestressing anchor assembly at the end of the T-beam. The method currently used in the project is to connect the external prestressing anchor assembly to the T-beam body by planting reinforcement. Due to the dense arrangement of ordinary steel bars in the main beam of the bridge, it is difficult to carry out the planting work under ideal conditions. Many more test holes need to be drilled, which not only causes great damage to the beam body, but also has the possibility of damaging the prestressed steel strands in the beam body, which brings great difficulties to the external prestressing construction.

[0005] How to develop an anchoring device for external prestressed reinforcement of bridges that does not damage the beam body, which has both good anchoring effect and will not damage the external prestressed anchoring components of the concrete T-beam body, has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0006] The purpose of the present invention is to provide an anchoring device for external prestressed reinforcement of a bridge without damaging the beam body, so as to solve the problems listed in the background technology.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The present invention discloses an anchoring device for external prestressed reinforcement of a bridge without damaging a beam body, comprising a concrete T-beam, wherein both ends of the concrete T-beam are respectively fixedly connected to external prestressed anchoring assemblies, and the external prestressed anchoring assemblies are fixedly connected via external prestressed tendons.

[0009] Preferably, the external prestressed anchor assembly comprises a friction anchor steel plate, an outer steel plate and a limit plate, the two sides of the outer steel plate are fixedly mounted with anchor steel plate grid assemblies, and the inner side of the outer steel plate is fixedly connected to the outer side of the friction anchor steel plate through the anchor steel plate grid assembly;

[0010] One end of the limit plate is fixedly connected to the inner side surface of the friction anchor steel plate, and the upper surface of the limit plate abuts against the lower surface of the horseshoe of the concrete T-beam;

[0011] It also includes a force transmission steel plate and a prestressed anchor rod, wherein the force transmission steel plate is fixedly installed between the opposite surfaces of the friction anchor steel plate and the outer steel plate;

[0012] The two ends of the prestressed anchor rod respectively penetrate the friction anchor steel plate and the outer steel plate, and the end of the prestressed anchor rod is installed with a prestressed anchor rod bottom pad and a prestressed anchor rod fastening nut.

[0013] Preferably, the inner surface of the friction anchoring steel plate is shot blasted to an uneven state.

[0014] Preferably, the outer sides of the web, lower triangle and horseshoe of the concrete T-beam are grinded to remove the surface slurry until the surface of the coarse aggregate is exposed.

[0015] Preferably, the inner side surface of the friction anchor steel plate is fixedly bonded to the outer side surfaces of the web, lower triangle and horseshoe of the concrete T-beam by civil high-performance epoxy adhesive.

[0016] Preferably, it also includes a prestressed tendon and an abutting force transmission steel plate, one end of the abutting force transmission steel plate is fixedly connected to the lower end of the inner side surface of the friction anchoring steel plate, and the other end of the abutting force transmission steel plate is fixedly connected to the lower anchor point steel plate;

[0017] The prestressed tendons pass through the anchoring area and are fixedly connected to the abutting force-transmitting steel plate.

[0018] Preferably, the anchoring steel plate grid assembly includes a transverse stiffening plate and a vertical stiffening plate, the transverse stiffening plate is fixedly connected to the vertical stiffening plate, and the transverse stiffening plate is fixedly installed at the upper end of the external prestressed anchor assembly, and the vertical stiffening plate is fixedly installed in the middle of the external prestressed anchor assembly.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are:

[0020] The present invention discloses an anchoring device for external prestressed reinforcement of a bridge without damaging a beam body, which does not require drilling holes or planting steel bars on an existing bridge beam body, does not damage the beam body, has a fast construction speed, and clearly receives force. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a front view schematic diagram of an anchoring device for external prestressing reinforcement of a bridge without damaging the beam body of the present invention;

[0023] Figure 2 It is a schematic side view of an anchoring device for external prestressing reinforcement of a bridge without damaging the beam body of the present invention;

[0024] Figure 3 It is a schematic diagram of the combined state of an anchoring device for external prestressing reinforcement of a bridge without damaging the beam body according to the present invention;

[0025] Figure 4 This is a schematic diagram of the axial cross section of A of the present invention;

[0026] Figure 5 It is a schematic diagram of the axial cross section of B of the present invention.

[0027] Explanation of the reference numerals in the accompanying drawings: 1. Concrete T-beam; 2. External prestressed anchor assembly; 3. External prestressed tendons; 4. Anchoring area; 5. Abutment force transmission steel plate; 6. Friction anchor steel plate; 7. Outer steel plate; 8. Transverse stiffening plate; 9. Force transmission steel plate; 10. Vertical stiffening plate; 11. Prestressed anchor rod; 12. Prestressed anchor rod fastening nut; 13. Prestressed anchor rod bottom pad; 14. Lower anchor point steel plate; 15. Limit plate. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] like Figure 1-5As shown, an anchoring device for external prestressed reinforcement of a bridge without damaging the beam body comprises a concrete T-beam 1, wherein both ends of the concrete T-beam 1 are respectively fixedly connected to external prestressed anchoring assemblies 2, and the external prestressed anchoring assemblies 2 are fixedly connected via external prestressed tendons 3, which are clamped below the concrete T-beam by the external prestressed anchoring assemblies 2, and tensioned between the two external prestressed anchoring assemblies 2 by the external prestressed tendons 3, so as to provide a pre-tightening force for the concrete T-beam 1. In the process of applying the pre-tightening force, it is not necessary to drill holes and plant tendons on the existing concrete T-beam to achieve the anchoring operation, and the beam body will not be damaged.

[0030] Specifically, the external prestressed anchor assembly 2 includes a friction anchor steel plate 6, an outer steel plate 7 and a limit plate 15. The inner surface of the friction anchor steel plate 6 is polished to an uneven state by shot blasting, and the outer side surfaces of the web, lower triangle and horseshoe of the concrete T-beam 1 are polished to remove the surface slurry until the surface of the coarse aggregate is exposed;

[0031] The inner side of the friction anchor steel plate 6 is fixedly bonded to the outer side of the web, lower triangle and horseshoe of the concrete T-beam 1 by civil high-performance epoxy adhesive, which closes the interface and increases the contact area of ​​the interface, further improving the friction strength between the friction anchor steel plate and the concrete T-beam;

[0032] Anchor steel plate grid assemblies are fixedly installed on the two sides of the outer steel plate 7, and the inner side of the outer steel plate 7 is fixedly connected to the outer side of the friction anchor steel plate 6 through the anchor steel plate grid assembly, and the anchor steel plate grid assembly can ensure uniform force transmission;

[0033] One end of the limit plate 15 is fixedly connected to the inner side of the friction anchor steel plate 6, and the upper surface of the limit plate 15 abuts against the lower surface of the horseshoe. The limit plate and the friction anchor steel plate cooperate to grasp the web, lower triangle and horseshoe of the concrete T-beam, ensuring that the limit plate and the friction anchor steel plate will not be displaced during the tensioning process, and further ensuring the tensioning effect;

[0034] It also includes a force transmission steel plate 9 and a prestressed anchor rod 11, wherein the force transmission steel plate 9 is fixedly installed between the opposite surfaces of the friction anchor steel plate 6 and the outer steel plate 7;

[0035] The two ends of the prestressed anchor rod 11 respectively penetrate the friction anchor steel plate 6 and the outer steel plate 7. The end of the prestressed anchor rod 11 is installed with a prestressed anchor rod bottom pad 13 and a prestressed anchor rod fastening nut 12. The pressure generated by tightening the prestressed anchor rod fastening nut 12 on the prestressed anchor rod is evenly transmitted to the anchoring interface of the friction anchor steel plate through the outer steel plate and the anchor steel plate grid assembly, so that the friction anchor steel plate is tightly compacted with the outer surface of the web, lower triangle and horseshoe of the concrete T-beam. Furthermore, the external prestressed anchor assembly is anchored on the concrete T-beam, and the horizontal tension generated by the external prestress in the anchoring area is balanced by the friction force of the contact surface, thereby achieving the effect of not damaging the beam body.

[0036] Specifically, it also includes a prestressed tendon 3 and an abutting force transmission steel plate 5, one end of the abutting force transmission steel plate 5 is fixedly connected to the lower end of the inner side surface of the friction anchoring steel plate 6, and the other end of the abutting force transmission steel plate 5 is fixedly connected to the lower anchor point steel plate 14;

[0037] The prestressed tendon 3 passes through the anchoring area 4 and is fixedly connected to the abutting force transmission steel plate 5; in order to facilitate the anchoring of the prestressed tendon, an external prestressed tendon anchoring area is designed below the prestressed anchor rod, and the external prestressed tendon anchoring area is installed on the abutting force transmission steel plate through high-strength bolts;

[0038] During assembly, the gap between the two lower anchor point steel plates 14 is about 3-5 mm. After the prestressed anchor bolt fastening nuts at both ends of the prestressed anchor bolt 11 are tightened, the two lower anchor point steel plates 14 are first compressed, and then the pressure is transferred to the friction anchor steel plate through force balance, so that the inner side of the friction anchor steel plate is all under pressure.

[0039] Specifically, the anchoring steel plate grid assembly includes a transverse stiffening plate 8 and a vertical stiffening plate 10, the transverse stiffening plate 8 is fixedly connected to the vertical stiffening plate 10, and the transverse stiffening plate 8 is fixedly installed at the upper end of the external prestressed anchor assembly 2, and the vertical stiffening plate 10 is fixedly installed in the middle of the external prestressed anchor assembly 2.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An anchoring device for external prestressing reinforcement of a bridge without damaging the beam body, comprising a concrete T-beam (1), characterized in that: Both ends of the concrete T-beam (1) are respectively fixedly connected to external prestressed anchoring components (2), and the external prestressed anchoring components (2) are fixedly connected via external prestressed tendons (3).

2. The anchoring device for external prestressing reinforcement of a bridge without damaging the beam body according to claim 1 is characterized in that: The external prestressed anchor assembly (2) comprises a friction anchor steel plate (6), an outer steel plate (7) and a limit plate (15), the two side surfaces of the outer steel plate (7) are fixedly mounted with anchor steel plate grid assemblies, and the inner side surface of the outer steel plate (7) is fixedly connected to the outer side surface of the friction anchor steel plate (6) via the anchor steel plate grid assembly; One end of the limit plate (15) is fixedly connected to the inner side surface of the friction anchor steel plate (6), and the upper surface of the limit plate (15) abuts against the lower surface of the horseshoe of the concrete T-beam (1); It also includes a force transmission steel plate (9) and a prestressed anchor rod (11), wherein the force transmission steel plate (9) is fixedly installed between the opposite surfaces of the friction anchor steel plate (6) and the outer steel plate (7); The two ends of the prestressed anchor rod (11) respectively penetrate the friction anchor steel plate (6) and the outer steel plate (7), and the end of the prestressed anchor rod (11) is installed with a prestressed anchor rod bottom pad (13) and a prestressed anchor rod fastening nut (12).

3. The anchoring device for external prestressing reinforcement of a bridge without damaging the beam body according to claim 2 is characterized in that: The inner surface of the friction anchoring steel plate (6) is shot blasted to an uneven state.

4. The anchoring device for external prestressing reinforcement of a bridge without damaging the beam body according to claim 3 is characterized in that: The outer side surfaces of the web, lower triangle and horseshoe of the concrete T-beam (1) are polished to remove the surface slurry until the surface of the coarse aggregate is exposed.

5. The anchoring device for external prestressing reinforcement of a bridge without damaging the beam body according to claim 4 is characterized in that: The inner side surface of the friction anchoring steel plate (6) is fixedly bonded to the outer side surfaces of the web, lower triangle and horseshoe of the concrete T-beam (1) by means of civil engineering high-performance epoxy adhesive.

6. The anchoring device for external prestressing reinforcement of a bridge without damaging the beam body according to claim 2, characterized in that: It also includes a prestressed tendon (3) and an abutting force transmission steel plate (5), one end of the abutting force transmission steel plate (5) is fixedly connected to the lower end of the inner side surface of the friction anchoring steel plate (6), and the other end of the abutting force transmission steel plate (5) is fixedly connected to the lower anchor point steel plate (14); The prestressed tendons (3) pass through the anchoring area (4) and are fixedly connected to the abutting force-transmitting steel plate (5).

7. The anchoring device for external prestressing reinforcement of a bridge without damaging the beam body according to claim 2 is characterized in that: The anchoring steel plate grid assembly comprises a transverse stiffening plate (8) and a vertical stiffening plate (10), wherein the transverse stiffening plate (8) is fixedly connected to the vertical stiffening plate (10), and the transverse stiffening plate (8) is fixedly mounted on the upper end of the external prestressed anchor assembly (2), and the vertical stiffening plate (10) is fixedly mounted on the middle part of the external prestressed anchor assembly (2).

Images