Reinforcing structure for reinforcing old concrete T beam by using UHPC (Ultra High Performance Concrete)
By using UHPC thin layers and precast components to reinforce old concrete T-beams, combined with prestressed steel bars and corrugated steel plates, the problem of insufficient reinforcement strength of old concrete T-beams was solved, achieving efficient bridge reinforcement and economical construction.
Patent Information
- Application Number
- CN202423051488.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-12-11
AI Technical Summary
Existing reinforced concrete T-beams are prone to structural problems such as web cracks during long-term use. Existing reinforcement methods result in increased bridge weight and poor reinforcement strength.
The old concrete T-beams were reinforced using thin layers of UHPC and precast components. By casting UHPC between the precast components and the old concrete T-beams, combined with prestressed steel bars and corrugated steel plates, an integral reinforcement structure was formed.
It improves the bending strength and load-bearing capacity of old concrete T-beams, reduces the bridge's self-weight and construction time, simplifies on-site procedures, and has superior bending and crack resistance as well as economic benefits.
Smart Images
Figure CN223510287U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge construction technology, and in particular to a reinforcement structure for reinforcing old concrete T-beams using UHPC. Background Technology
[0002] Bridges play a crucial role in modern road engineering. Many concrete bridges are affected by various factors over long-term operation, such as environmental erosion, traffic loads, and material aging, which can lead to damage and cracking. Therefore, reinforcement and strengthening of old concrete bridges is essential. Concrete T-beams are particularly common in these bridges, often prone to structural problems such as web cracking, requiring effective reinforcement measures to enhance their structural integrity and load-bearing capacity. Based on the damage assessment results of concrete T-beams, targeted reinforcement schemes are designed, such as increasing the cross-section, bonding steel plates, using fiber composite materials, external prestressing reinforcement, and modifying the structural system. Using ordinary concrete for cross-section enlargement significantly increases the bridge's self-weight, but the increase in cross-sectional strength and ductility is not substantial, resulting in poor reinforcement strength.
[0003] Furthermore, UHPC is a cement-based composite material with superior performance. Through optimized material composition and processing, it excels in strength, durability, and construction flexibility. UHPC possesses extremely high compressive and flexural strengths, typically two to three times that of conventional concrete, enabling it to withstand greater loads and deformations. UHPC exhibits good toughness under tension, maintaining a certain tensile strength even after cracking. Due to its excellent mechanical properties, the amount of UHPC required to meet strength requirements is significantly less than that of ordinary concrete, resulting in a superior reinforcement effect compared to the conventional method of increasing the cross-section of concrete. Summary of the Invention
[0004] The technical problem to be solved by this utility model is to provide a reinforcement structure for strengthening old concrete T-beams using UHPC. This reinforcement structure can improve the bending strength of the web and bottom plate of the old concrete T-beam after cracks appear. The reinforcement structure for strengthening the bending and shear zones of the web and bottom plate of the old concrete T-beam using thin UHPC layers and precast components involves roughening and inserting rebars on the old concrete T-beam, and then pouring UHPC into the bending and shear zones of the old concrete T-beam to finally form a reinforcement structure, which can solve the problem of poor reinforcement strength in the past.
[0005] To address the aforementioned technical problems, this utility model discloses a reinforcement structure for strengthening old concrete T-beams using UHPC, comprising prestressed steel bars and at least two precast components. Each precast component includes a U-shaped corrugated steel plate, with a UHPC layer cast on its outer surface. Welded portions extend outward from the ends of the corrugated steel plate. PVC pipes, arranged along the length of the precast components, are embedded within the UHPC layer. Both ends of the PVC pipes have outward-extending connecting portions that pass through the end faces of the UHPC layer. Adjacent precast components are joined end-to-end and cover the outer surface of the old concrete T-beam. The welded portions of the adjacent precast components are welded and fixed. The PVC pipes of the adjacent precast components are connected by flexible hoses. Prestressed steel bars are inserted within the PVC pipes and flexible hoses. A UHPC layer is cast between the precast components and the old concrete T-beam.
[0006] The length of the connecting part is less than the length of the welded part.
[0007] The inner side of the precast component is provided with multiple grooves arranged at intervals along the circumference of the precast component.
[0008] The inner side and / or inner side of the precast component are provided with multiple groups of weld studs arranged at intervals along the circumference of the precast component, and each group of weld studs includes multiple weld stud bodies arranged at intervals along the length of the precast component.
[0009] The connecting part bends outwards.
[0010] In this case, two adjacent connecting parts are on the same horizontal plane.
[0011] UHPC is cast at the weld joint of the welded parts of two adjacent precast components.
[0012] Compared with the prior art, the embodiments of this utility model have the following beneficial effects:
[0013] (1) The bending and shear zone of the web or bottom plate structure of the old concrete T-beam is reinforced by using precast components with UHPC layers. The reinforcement is carried out by pouring UHPC between the precast components and the old concrete T-beam. Compared with the traditional method of increasing the cross section by using ordinary concrete, it has a smaller increase in the self-weight of the bridge and a smaller increase in thickness. The overall stress performance and bending resistance of the reinforced components are better, which solves the problem of poor reinforcement strength in the past.
[0014] (2) The welded parts between two adjacent prefabricated components are welded and fixed. The corrugated steel plate after welding can improve the bending performance of the T-beam.
[0015] (3) The overall structure is simple and compact. After roughening and rebar installation of the old concrete T-beam, UHPC is poured. It has excellent bending and crack resistance, and its bearing capacity is significantly improved compared with other reinforcement measures. The construction is also simpler and more applicable in engineering practice.
[0016] (4) By making prefabricated components to reinforce old concrete T-beams, the on-site formwork and steel bar binding processes are reduced, realizing prefabricated construction, shortening construction time, simplifying on-site procedures, and having good economic benefits. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a structural schematic diagram of the first prefabricated component of this utility model;
[0019] Figure 2 This is a schematic diagram of the structure of the first prefabricated component of this utility model;
[0020] Figure 3 This is a diagram showing the internal structure of the first prefabricated component of this utility model;
[0021] Figure 4 This is a structural schematic diagram of the second prefabricated component of this utility model;
[0022] Figure 5 This is an internal structural diagram of the second prefabricated component of this utility model;
[0023] Figure 6 This is a schematic diagram of the structure of the corrugated steel plate of this utility model;
[0024] Figure 7 This is a structural schematic diagram of the corrugated steel plate of this utility model from another perspective;
[0025] Figure 8 This is a schematic diagram of the reinforcing structure of this utility model. Detailed Implementation
[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0027] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.
[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0029] This utility model discloses a specific implementation method for a reinforcement structure using UHPC to strengthen old concrete T-beams. Please see [link / reference]. Figures 1 to 8 As shown, the reinforcing structure includes prestressed steel bars and at least two precast components. It should be noted that the precast components can be divided into various types according to different specifications or parts of the structure. In this embodiment, two different precast components are used as examples for illustration, namely the first precast component 11 and the second precast component 12.
[0030] Combination Figures 1 to 3 Each of the first prefabricated components 11 includes a U-shaped corrugated steel plate 2. A UHPC layer 4 is cast on the outer surface of the corrugated steel plate 2, and welded portions 21 extend outward from the ends of the corrugated steel plate 2. PVC pipes 3, arranged along the length of the prefabricated component, are embedded within the UHPC layer 4. For ease of construction and welding, the length of the connecting portion 31 is less than the length of the welded portion 21. Both ends of the PVC pipe 3 are provided with outwardly extending connecting portions 31 that pass through the end face of the UHPC layer 4. Optionally, the connecting portions 31 are bent outward to form a certain arc at both ends of the PVC pipe 3.
[0031] It should be noted that the corrugated steel plate 2 of the first prefabricated component 11 extends outward to the welded part 21 only at the front or rear end.
[0032] Optionally, depending on the actual situation, the connecting parts 31 at both ends of the PVC pipe 3 can be respectively set at the lower part of the front end face of the UHPC layer 4 and the upper part of the rear end face of the UHPC layer 4, so that the PVC pipe 3 is set at an angle inside the UHPC layer 4.
[0033] To ensure better bonding between the UHPC layer 4 and the corrugated steel plate 2, and between the corrugated steel plate 2 and the old concrete T-beam 6, the inner surface of the precast component is provided with multiple grooves 22 spaced apart along the circumference of the precast component. This can be understood as the U-shaped corrugated steel plate 2 forming a groove, with at least two spaced grooves 22 on the inner walls and bottom of the groove. Additionally, the inner surface of the precast component is provided with multiple weld stud groups 5 spaced apart along the circumference of the precast component. Each weld stud group 5 includes multiple weld stud bodies spaced apart along the length of the precast component. The position of the weld stud groups 5 can be selectively set according to actual working conditions.
[0034] Combination Figures 4 to 6 The structure of the second precast component 12 is similar to that of the first precast component 11, except that the corrugated steel plate 2 of the second precast component 12 has welded portions 21 extending outwards from both its front and rear ends. This structure of the second precast component 12 is mainly used in situations where there is a first precast component 11 at both the front and rear. In addition, the PVC pipe 3 of the second precast component 12 is arranged along the axial direction of the second precast component 12.
[0035] During construction, two adjacent precast components are joined end-to-end and cover the outer surface of the old concrete T-beam 6. The welded joints 21 of the two adjacent precast components are welded and fixed. The PVC pipes of the two adjacent precast components are connected by flexible hoses, and the prestressed steel bars are inserted inside the PVC pipes and flexible hoses. In addition, UHPC is cast between the precast components and the old concrete T-beam 6. Similarly, UHPC is cast at the welded joints 21 of the two adjacent precast components.
[0036] Combination Figure 8 The construction process of the reinforcement structure in this embodiment is as follows: First, the old concrete T-beam 6 is roughened and reinforced with steel bars, and steel bars are inserted transversely at equal intervals in the web of the T-beam.
[0037] The second step involves fabricating the first precast component 11 and the second precast component 12. The steel plate is shaped into a U-shape to form a corrugated steel plate 2. Weld studs are then welded to the inner and outer surfaces of the corrugated steel plate 2 to ensure a tight bond between the UHPC and the corrugated steel plate 2 during the casting of the outer UHPC layer 4. The position of the weld stud assembly 5 can be adjusted according to actual conditions, for example... Figure 6In the process, the groove 22 located below the inner wall of the trench is not equipped with weld stud group 5 to prevent overlap with the inserted reinforcing bars. After the weld stud group 5 is welded, PVC pipe 3 is installed on the outside of the corrugated steel plate 2. The exposed connection part 31 of PVC pipe 3 can be adjusted according to the actual situation. For example, the PVC pipe 3 near the outer end of the T-beam of the second precast component 12 needs to be extended to the neutral axis of the T-beam and slightly protruded. Finally, a layer of UHPC is poured on the outside of the first precast component 11 and the second precast component 12 to form a UHPC layer 4 and cover the PVC pipe 3.
[0038] In the second step, the PVC pipe 3 near the inner end of the T-beam of the second precast component 12 is at the same height as the PVC pipe 3 of the first precast component 11. This can be understood as the two opposite connection parts 31 in the two adjacent precast components being on the same horizontal plane. In particular, the end face of the connection part 31 of the PVC pipe 3 of the second precast component 12 is parallel to the end face of the UHPC layer 4, so that the PVC pipe 3 is perpendicular to the end face of the UHPC layer 4, which facilitates the subsequent tensioning of prestressed steel bars.
[0039] The third step involves temporarily fixing the first precast component 11 and the precast components to the web (outer side) of the old concrete T-beam 6. The weld joint 21 between the first precast component 11 and the second precast component 12 is then welded and fixed. After welding, the corrugated steel plates 2 enhance the bending resistance of the old concrete T-beam 6. UHPC is then poured between the old concrete T-beam and the precast components to form a unified structure. PVC pipes 3 between adjacent precast components are connected by flexible hoses, and prestressed steel bars are threaded through each PVC pipe 3 and flexible hose to tension the steel bars. Finally, UHPC is poured at the weld joints to form a unified structure with all precast components, completing the construction of the entire reinforcement structure.
[0040] In this embodiment, the reinforcement structure uses precast components with a UHPC layer 4 to reinforce the bending and shear zones of the web or base slab of the old concrete T-beam 6. Reinforcement is achieved by casting UHPC between the precast component and the old concrete T-beam 6. Compared to the traditional method of increasing the cross-section using ordinary concrete, this method results in a smaller increase in the bridge's self-weight and thickness. The reinforced component exhibits better overall load-bearing capacity and bending resistance, solving the problem of poor reinforcement strength in previous methods. The welded joints 21 between adjacent precast components are welded together, and the corrugated steel plate 2 further enhances the bending resistance of the T-beam. The overall structure is simple and compact. Combined with the roughening and rebar installation of the old concrete T-beam 6 followed by the casting of UHPC, it exhibits superior bending and crack resistance, significantly improving load-bearing capacity compared to other reinforcement measures. Construction is also simpler, making it more suitable for practical engineering applications.
[0041] In practical applications, the reinforcement structure in this embodiment strengthens old concrete T-beams by fabricating prefabricated components. Compared with traditional reinforcement construction methods, it can reduce on-site formwork erection and rebar tying, realize prefabricated construction, shorten construction time, simplify on-site procedures, and has good economic benefits.
[0042] Finally, it should be noted that the reinforcement structure for strengthening old concrete T-beams using UHPC disclosed in this utility model embodiment is only a preferred embodiment of this utility model and is only used to illustrate the technical solution of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.
Claims
1. A reinforcement structure for strengthening old concrete T-beams using UHPC, characterized in that, It includes prestressed steel bars and at least two precast components. Each precast component includes a U-shaped corrugated steel plate. A UHPC layer is cast on the outer side of the corrugated steel plate. Welded portions extend outward from the ends of the corrugated steel plate. A PVC pipe is embedded in the UHPC layer and arranged along the length of the precast component. Both ends of the PVC pipe are provided with outwardly extending connecting portions that pass through the end face of the UHPC layer. The two adjacent precast components are joined end to end and cover the outer side of the old concrete T-beam. The welded parts of the two adjacent precast components are welded and fixed. The PVC pipes of the two adjacent precast components are connected by flexible hoses. The prestressed steel bars are passed through the PVC pipes and flexible hoses. UHPC is poured between the precast component and the old concrete T-beam.
2. The reinforcement structure for strengthening old concrete T-beams using UHPC according to claim 1, characterized in that, The length of the connecting part is less than the length of the welded part.
3. The reinforcement structure for strengthening old concrete T-beams using UHPC according to claim 1, characterized in that, The inner surface of the prefabricated component is provided with a plurality of grooves arranged at intervals along the circumference of the prefabricated component.
4. A reinforcement structure for strengthening old concrete T-beams using UHPC according to any one of claims 1 to 3, characterized in that, The inner side and / or inner side of the precast component are provided with a plurality of weld stud groups arranged at intervals along the circumference of the precast component, and each weld stud group includes a plurality of weld stud bodies arranged at intervals along the length direction of the precast component.
5. A reinforcement structure for strengthening old concrete T-beams using UHPC according to claim 1, characterized in that, The connecting part bends outward.
6. A reinforcement structure for strengthening old concrete T-beams using UHPC according to claim 1, characterized in that, The two adjacent connecting parts are on the same horizontal plane.
7. A reinforcement structure for strengthening old concrete T-beams using UHPC according to claim 1, characterized in that, UHPC is cast at the weld joint of the welded parts of two adjacent prefabricated components.