Section steel framework and UHPC (Ultra High Performance Concrete) bridge pier reinforcing structure

Abstract

The utility model relates to the field of bridge engineering, and discloses a structural steel framework and UHPC (Ultra High Performance Concrete) bridge pier reinforcing structure, which comprises a structural steel framework fixedly arranged in the circumferential direction of a concrete pier column, and the bottom of the structural steel framework is fixedly connected with a concrete bearing platform; and the cast-in-place outer wrapping UHPC concrete is poured in the position, provided with the profile steel framework, of the concrete pier column and located on the outer side of the profile steel framework, and the profile steel framework, the concrete pier column and the concrete bearing platform form an integral structure capable of being cooperatively stressed and laterally moved through the cast-in-place outer wrapping UHPC concrete. The bearing capacity of the concrete pier can be effectively improved, the service life of the bridge is prolonged, and the safety of the bridge is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a reinforcing structure for a steel skeleton + UHPC concrete bridge pier. Background Technique

[0002] The main load-bearing components of a bridge are the main girder, bridge pier and foundation. Among them, the bridge pier plays a connecting role and is one of the key components of the bridge. The structural forms of bridge piers are diverse, including concrete bridge piers, steel bridge piers and composite structure bridge piers. Among them, the concrete bridge pier is the most widely used in bridge engineering due to its simple structural form, clear force-bearing and convenient construction.

[0003] While the bridge pier supports the upper structure and transfers the load of the upper structure to the foundation, it also bears the flowing water pressure, the impact force of ships or vehicles, and the acting forces of natural disasters such as earthquakes and debris flows. These unfavourable loads for the bridge force act directly on the bridge pier, resulting in the strength, stability and bearing capacity of the bridge pier structure being affected. Therefore, during the operation of the bridge, relatively serious diseases have occurred in the concrete bridge pier under some natural disasters, design defects or human factors, such as concrete cracking, honeycombing, exposed reinforcement and displacement, etc. The causes of different disease types are also different, and some are even caused by multiple reasons resulting in structural defects. This will not only affect the upper structure of the bridge, but in severe cases may even lead to the collapse of the entire bridge, threatening the safety of the masses and causing serious economic losses.

[0004] Therefore, the reinforcement and transformation of existing bridge piers is a hot issue for current bridges. At present, the main reinforcement structures for concrete bridge piers include concrete jacketing, steel plate wrapping, carbon fiber cloth pasting, adding concrete hoops or sheaths, external prestress, etc. Each of these methods has its applicable scenarios, advantages and disadvantages. Choosing a suitable reinforcement structure or method requires considering the actual conditions and reinforcement requirements of the bridge pier. How to economically, effectively and practically reinforce and repair this type of bridge pier, effectively improve the bearing capacity of the bridge pier, and then extend the service life of the existing bridge and ensure its safety is the key problem faced by bridge engineering technicians. Summary of the Invention

[0005] Aiming at the above problems, the purpose of the utility model is to provide a reinforcing structure for a steel skeleton + UHPC concrete bridge pier, which can effectively improve the bearing capacity of the concrete bridge pier, and then extend the service life of the bridge and ensure its safety.

[0006] To achieve the above object, the utility model adopts the following technical solutions: A steel skeleton + UHPC concrete pier reinforcement structure, which includes: a steel skeleton, fixedly arranged circumferentially on the concrete pier column, and the bottom of the steel skeleton is fixedly connected to the concrete pile cap; cast-in-place UHPC concrete, poured at the position where the steel skeleton is arranged on the concrete pier column, located outside the steel skeleton, and the steel skeleton, the concrete pier column and the concrete pile cap are formed into an integral structure that can work together and deform by the cast-in-place UHPC concrete.

[0007] Further, the steel skeleton is arranged on both sides of the concrete pier column along the bridge longitudinal direction.

[0008] Further, the steel skeleton includes a plurality of profiled steel bars, a pile cap bonding steel plate and a plurality of steel bars;

[0009] The profiled steel bar is composed of a flange plate and a stiffening rib, and the transverse section of the profiled steel bar is a T-shaped structure;

[0010] A plurality of flange plates are arranged at intervals on the side wall of the concrete pier column, and the bottoms of the plurality of flange plates are fixedly arranged on the side of the pile cap bonding steel plate;

[0011] A plurality of steel bars are arranged at intervals along the height direction of the stiffening rib on the stiffening rib, and the bottom of the stiffening rib is fixed on the top of the pile cap bonding steel plate;

[0012] The bottom of the pile cap bonding steel plate is fixedly arranged on the concrete pile cap.

[0013] Further, both the flange plate and the stiffening rib are fixedly connected to the pile cap bonding steel plate by welding.

[0014] Further, the flange plate is arranged on the side wall of the concrete pier column along the bridge longitudinal direction and is arranged at intervals along the bridge transverse direction.

[0015] Further, the flange plate is connected to the side wall of the concrete pier column through embedded anchor bolts and adhesives.

[0016] Further, a plurality of through holes are arranged at intervals along the height direction of the stiffening rib on the stiffening rib for cooperating with the steel bars for installation.

[0017] Further, the pile cap bonding steel plate is connected to the concrete pile cap through embedded anchor bolts and adhesives.

[0018] Further, the thicknesses of the flange plate, the stiffening rib and the pile cap bonding steel plate are all set to be 8 mm to 16 mm.

[0019] Further, the thickness of the cast-in-place UHPC concrete is 3 to 5 cm.

[0020] Due to the adoption of the above technical solutions, the utility model has the following advantages:

[0021] 1. The steel skeleton + UHPC concrete pier reinforcement structure of the present utility model consists of multiple ribbed steel sections, steel plates pasted on the bearing platform, and multiple steel bars to jointly form a steel skeleton. Through cast-in-place outer UHPC concrete, the steel skeleton is combined with the concrete pier and the concrete bearing platform to form an integral structure, forming a structure that collaborates in force and deformation, significantly enhancing the bearing capacity of the in-service concrete pier, extending the service life of the bridge, and ensuring its safety.

[0022] 2. In the steel skeleton + UHPC concrete pier reinforcement structure of the present utility model, the round holes on the stiffening ribs of the ribbed steel section can significantly improve the connection performance between the steel skeleton and the outer UHPC concrete. At the same time, it can be used as formwork support during the construction process, ensuring the construction performance.

[0023] 3. The flange plate of the ribbed steel section of the present utility model is connected to the surface of the concrete pier through embedded anchor bolts and adhesives, and the steel plate pasted on the bearing platform is connected to the surface of the concrete bearing platform through embedded anchor bolts and adhesives, which can significantly improve the connection performance between the steel skeleton and the concrete pier and the concrete bearing platform.

[0024] 4. In the steel skeleton + UHPC concrete pier reinforcement structure of the present utility model, the steel skeleton composed of ribbed steel sections, steel plates pasted on the bearing platform, and multiple steel bars can form continuously arranged confined concrete for the concrete pier reinforcement structure, improving the bearing capacity and crack resistance of the concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a three-dimensional schematic diagram of the overall structure of the steel skeleton + UHPC concrete pier reinforcement structure in the embodiment of the present utility model;

[0026] Figure 2 is a three-dimensional schematic diagram of the structure of the steel skeleton in the embodiment of the present utility model;

[0027] Reference Signs:

[0028] 1 - Concrete pier, 2 - Concrete bearing platform, 3 - Steel skeleton, 31 - Multiple ribbed steel sections, 311 - Flange plate, 312 - Stiffening rib, 3121 - Through hole, 32 - Steel plate pasted on the bearing platform, 33 - Multiple steel bars, 4 - Cast-in-place outer UHPC concrete. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] For the reinforcement and transformation of the concrete piers of existing bridges, how to achieve economical, effective and practical reinforcement and repair of this type of piers, effectively improve the bearing capacity of the piers, and then extend the service life of the existing bridges and ensure their safety is the current demand for the reinforcement structure and technology of concrete piers. In view of the existing demand for the reinforcement structure and technology of concrete piers, the utility model provides a reinforcement structure for a steel skeleton + UHPC concrete pier, which includes a concrete pier column, a concrete bearing platform, a steel skeleton, and cast-in-place UHPC. The steel skeleton is composed of multiple profiled steels with ribs, steel plates pasted on the bearing platform, and multiple steel bars. The steel skeleton is arranged on the concrete bearing platform and connected to the concrete pier column through the flange plates of the profiled steels with ribs, and is arranged on both sides of the concrete pier column along the bridge direction. Cast-in-place UHPC is poured at the position of the steel skeleton. The cast-in-place UHPC combines the steel skeleton with the concrete pier column and the concrete bearing platform to form an integral structure that bears force synergistically. By using the utility model, the stress area of the concrete pier column is increased, the bearing capacity of the concrete pier column is effectively improved, and the safety performance of the concrete pier column is enhanced.

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the described embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present utility model.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the described features, steps, operations, devices, components, and / or their combinations.

[0032] In an embodiment of the present utility model, a reinforcement structure for a steel skeleton + UHPC concrete pier is provided for the reinforcement and improvement of the bearing capacity of in-service concrete piers. In this embodiment, as Figure 1 shown, the reinforcement structure includes:

[0033] A steel skeleton 3, fixedly arranged circumferentially on the concrete pier column 1, and the bottom of the steel skeleton 3 is fixedly connected to the concrete bearing platform 2;

[0034] Cast-in-place UHPC concrete 4, poured at the position where the steel skeleton 3 is provided on the concrete pier column 1, located outside the steel skeleton 3. Through the cast-in-place UHPC concrete 4, the steel skeleton 3, the concrete pier column 1, and the concrete bearing platform 2 are combined into an integral structure that can bear force synergistically and function together.

[0035] In use, first, the steel skeleton 3 is fixed on the concrete pier 1 and the concrete pile cap 2. Then, cast the in-situ UHPC concrete 4 outside the steel skeleton 3 to form an integral force-bearing structure with the steel skeleton 3, the concrete pier 1, and the concrete pile cap 2, significantly improving the bearing capacity of the existing concrete bridge piers, extending the service life of the bridge, and ensuring its safety.

[0036] In the above embodiment, preferably, the steel skeleton 3 is arranged on both sides of the concrete pier 1 along the bridge longitudinal direction.

[0037] As Figure 2 shown, the steel skeleton 3 includes a plurality of profiled steel bars 31 with ribs, a steel plate 32 for bonding to the pile cap, and a plurality of steel bars 33. The profiled steel bar 31 with ribs is composed of a flange plate 311 and a stiffening rib 312, and the transverse cross-section of the profiled steel bar 31 with ribs is a T-shaped structure. A plurality of flange plates 311 are arranged at intervals on the side wall of the concrete pier 1, and the bottoms of the plurality of flange plates 311 are fixedly arranged on the side of the steel plate 32 for bonding to the pile cap; a plurality of steel bars 33 are arranged at intervals along the height direction of the stiffening rib 312 on the stiffening rib 312, and the bottom of the stiffening rib 312 is fixed on the top of the steel plate 32 for bonding to the pile cap; the bottom of the steel plate 32 for bonding to the pile cap is fixedly arranged on the concrete pile cap 2.

[0038] In this embodiment, between the flange plate 311, the stiffening rib 312 and the steel plate 32 for bonding to the pile cap, welding is used for fixation to weld the flange plate 311, the stiffening rib 312 and the steel plate 32 for bonding to the pile cap into an integral body.

[0039] Optionally, the flange plate 311 is arranged on the side wall of the concrete pier 1 along the bridge longitudinal direction and is arranged at intervals along the bridge transverse direction.

[0040] Optionally, the flange plate 311 is connected to the side wall of the concrete pier 1 through embedded anchor bolts and adhesives, which can significantly improve the connection performance between the steel skeleton 3 and the concrete pier 1.

[0041] In this embodiment, preferably, a plurality of through holes 3121 are arranged at intervals along the height direction of the stiffening rib 312; the through holes are preferably round holes for close-fitting installation with the steel bars 33; and through the cooperation between the steel bars 33 and the stiffening rib 312, the connection performance between the steel skeleton 3 and the outer UHPC concrete 4 can be significantly improved, and it can also be used as formwork support during the construction process, ensuring the construction performance.

[0042] Optionally, the diameter of the round hole is 40 mm to 60 mm, and the net hole distance > 60 mm.

[0043] Optionally, the diameter of the steel bar 33 is 12 mm to 20 mm.

[0044] In this embodiment, the steel plate 32 pasted on the bearing platform is connected to the concrete bearing platform 2 through embedded anchor bolts and adhesives, which can significantly improve the connection performance between the steel skeleton 3 and the concrete bearing platform 2.

[0045] In this embodiment, preferably, the thicknesses of the flange plate 311, the stiffening rib 312, and the steel plate 32 pasted on the bearing platform are all set to be 8 mm to 16 mm.

[0046] In this embodiment, the distance between two adjacent flange plates 311 is preferably 30 cm to 100 cm.

[0047] In the above embodiments, the thickness of the cast-in-place UHPC concrete 4 is preferably 3 to 5 cm to form a protective layer.

[0048] In summary, for the steel skeleton + UHPC concrete bridge pier reinforcement structure of the present utility model, the steel skeleton 3 composed of the ribbed steel 31, the steel plate 32 pasted on the bearing platform, and multiple steel bars 33 can form continuously arranged confined concrete for the concrete bridge pier reinforcement structure, improving the bearing capacity and crack resistance of the concrete.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A reinforcing structure for a steel section skeleton + UHPC concrete bridge pier, characterized in that Including: A profiled steel skeleton, fixedly arranged circumferentially on the concrete pier column, and the bottom of the profiled steel skeleton is fixedly connected to the concrete pile cap; Cast-in-place UHPC concrete is poured at the position where the profiled steel skeleton is arranged on the concrete pier column, located outside the profiled steel skeleton. The profiled steel skeleton, the concrete pier column and the concrete pile cap are composed of an integral structure that can work together and move along the side.

2. The steel skeleton + UHPC concrete pier reinforcement structure according to claim 1, wherein The profiled steel skeleton is arranged on both sides of the concrete pier column along the bridge longitudinal direction.

3. The steel skeleton + UHPC concrete pier reinforcement structure according to claim 1, characterized in that, The profiled steel skeleton includes a plurality of profiled steel bars with ribs, steel plates pasted on the pile cap and a plurality of steel bars; The profiled steel bar with ribs is composed of a flange plate and a stiffening rib, and the transverse section of the profiled steel bar with ribs is a T-shaped structure; A plurality of flange plates are arranged at intervals on the side wall of the concrete pier column, and the bottoms of the plurality of flange plates are fixedly arranged on the side of the steel plate pasted on the pile cap; A plurality of steel bars are arranged at intervals along the height direction of the stiffening rib on the stiffening rib, and the bottom of the stiffening rib is fixed on the top of the steel plate pasted on the pile cap; The bottom of the steel plate pasted on the pile cap is fixedly arranged on the concrete pile cap.

4. The steel skeleton + UHPC concrete pier reinforcement structure according to claim 3, characterized in that Both the flange plate and the stiffening rib are fixed to the steel plate pasted on the pile cap by welding.

5. The steel skeleton + UHPC concrete pier reinforcement structure according to claim 3, characterized in that, The flange plate is arranged along the bridge longitudinal direction on the side wall of the concrete pier column and is arranged at intervals along the bridge transverse direction.

6. The steel skeleton + UHPC concrete pier reinforcement structure according to claim 3, characterized in that, The flange plate is connected to the side wall of the concrete pier column through embedded anchor bolts and adhesives.

7. The steel skeleton + UHPC concrete pier reinforcement structure according to claim 3, characterized in that, A plurality of through holes are arranged at intervals along the height direction of the stiffening rib to cooperate with the installation of the steel bars.

8. The steel skeleton + UHPC concrete pier reinforcement structure according to claim 3, characterized in that, The steel plate pasted on the pile cap is connected to the concrete pile cap through embedded anchor bolts and adhesives.

9. The steel skeleton + UHPC concrete pier reinforcement structure according to claim 3, wherein, The thicknesses of the flange plate, the stiffening rib and the steel plate pasted on the pile cap are all set to be 8 mm to 16 mm.

10. The steel skeleton + UHPC concrete pier reinforcement structure according to claim 1, characterized in that, The thickness of the cast-in-place UHPC concrete is 3 to 5 cm.

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