Cantilever beam additional bent rib structure
By adding bent bars to the cantilever beam and using stirrups and U-shaped anchor bars to form a closed loop, the problems of increased load and poor material durability in the reinforcement of cantilever beams are solved, thereby improving the stability and safety of the structure.
Patent Information
- Application Number
- CN202520398346.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-03-10
Smart Images
Figure CN223838669U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of reinforced concrete structure strengthening technology, and in particular to a cantilever beam with additional bent reinforcement structure. Background Technology
[0002] A cantilever beam is a building component that extends from the main structure, with one end connected to the main structure and the other end unsupported. It is typically made of reinforced concrete and does not have supports at both ends; instead, one end is embedded in or cast into a support, while the other end protrudes beyond the support. The main function of a cantilever beam is to support end loads, such as those found in balconies, canopies, and eaves. Based on its length embedded in the wall and its stiffness relative to the masonry, cantilever beams can be classified into elastic and rigid types. When the length embedded in the wall is large and the beam's stiffness relative to the masonry is small, the beam undergoes significant deflection, and is called an elastic cantilever beam. When the length embedded in the wall is short and the beam's stiffness relative to the masonry is large, the deflection is small, and rigid rotational deformation mainly occurs, and this is called a rigid cantilever beam.
[0003] Currently, in construction projects, with the increase in service life, many older buildings exhibit varying degrees of aging and damage in their cantilever beams, leading to a decrease in their load-bearing capacity and reduced safety performance. To extend the service life of these buildings and improve their safety, effective reinforcement of cantilever beams has become an urgent task. Traditional reinforcement methods mainly include increasing the cross-sectional area, external steel cladding, and bonding fiber composite materials. The first method increases the cross-sectional area of the cantilever beam by adding a new concrete layer; the second method reinforces the cantilever beam by external steel cladding, which offers good strength and durability; and the third method uses lightweight, high-strength materials such as carbon fiber cloth or fiberglass cloth for surface reinforcement, which is simple to operate and lightweight.
[0004] While existing cantilever beam reinforcement technologies can solve the problem to some extent, they still have many shortcomings. For example, thickening the concrete layer significantly increases the additional load, which is detrimental to the safety and stability of existing buildings; external steel structures are not easy to promote and popularize due to their complex construction process and high economic investment; and although fiber-reinforced materials can complete construction quickly, the materials themselves have poor weather resistance and corrosion resistance, making it difficult to guarantee the reinforcement effect over a long period of time. Therefore, to address these shortcomings, a cantilever beam additional bending reinforcement structure is proposed to solve the above problems. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides a cantilever beam with additional bent reinforcement structure, which aims to improve the existing technology of cantilever beam reinforcement, which cannot effectively enhance the structural strength, but cannot guarantee long-term reliability and aesthetic harmony.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: a cantilever beam with additional bent bars, comprising a cantilever beam and two main bars, wherein a connecting component is provided at the bottom of the cantilever beam, multiple stirrups are provided on the outside of the two main bars, a reinforcing component is provided on the adjacent side of the two main bars, and multiple U-shaped anchor bars are fixedly connected to the bottom of the connecting component.
[0007] The above technical solutions effectively enhance the support strength through stirrups and main reinforcement, and effectively reduce the occurrence of local stress concentration by using U-shaped anchoring steel bars.
[0008] As a further description of the above technical solution:
[0009] The connecting assembly includes multiple embedded steel plates, the bottoms of which are fixedly connected to the bottom of the cantilever beam, and each of the multiple embedded steel plates has two pads fixedly connected to its bottom.
[0010] Through the above technical solution, the pre-embedded steel plate and the pad block provide accurate installation positions for the U-shaped anchor steel bars and the main bars, thereby ensuring the reasonable distribution of force.
[0011] As a further description of the above technical solution:
[0012] The reinforcing component includes multiple cross reinforcing ribs, with the front and rear sides of the multiple cross reinforcing ribs respectively fixedly connected to the adjacent sides of the two main ribs, and the included angle between the cross reinforcing ribs is 30°.
[0013] The above technical solution effectively distributes the stress borne by the main reinforcement bars, thereby greatly improving the stability and load-bearing capacity of the structure.
[0014] As a further description of the above technical solution:
[0015] The inside of the stirrup is tied to the outside of the main reinforcement, and the inside of the U-shaped anchoring reinforcement is in contact with the outside of the main reinforcement.
[0016] The above technical solution effectively supports the main reinforcement bars by using U-shaped anchor steel bars.
[0017] As a further description of the above technical solution: the two ends of the U-shaped anchoring steel bar are respectively welded to the bottom of the pre-embedded steel plate, and the middle part passes through the skeleton formed by the main bar and the stirrup, forming a closed loop.
[0018] The above technical solution connects the upper and lower stress zones with U-shaped anchor steel bars, which not only withstand pressure in the whole system, but also play a guiding role, making the force distribution more uniform and reasonable.
[0019] As a further description of the above technical solution: the main reinforcement bars are laid sequentially to the predetermined positions, adjusted to the correct height, and then temporarily fixed with binding wire, with the outside of the main reinforcement bars in contact with the bottom of the pad block.
[0020] The above technical solution provides a foundation for the effective load-bearing capacity of this structure through the reasonable distribution and installation of the main reinforcement bars.
[0021] As a further description of the above technical solution: multiple spacers are evenly distributed on the top of the main reinforcement bars, and the stirrups are evenly distributed on the outside of the main reinforcement bars.
[0022] The above technical solution uses spacers to help install the main reinforcement bars at the appropriate height and position.
[0023] As a further description of the above technical solution: the cross reinforcing bars and the stirrups are located on the same plane as the main reinforcing bars, and the cross reinforcing bars are evenly distributed on the outside of the main reinforcing bars.
[0024] The above technical solution effectively improves load-bearing capacity, ensures uniform stress distribution, and avoids stress concentration by utilizing the combination of cross reinforcing bars and stirrups.
[0025] This utility model has the following beneficial effects:
[0026] This invention significantly enhances the bending resistance and seismic performance of cantilever beams, greatly reduces the risk of cracking, and optimizes the force transmission mechanism of the structure through precise positioning and scientific layout of the reinforcing bars, making it more adaptable to changes in external loads. Construction is simple and quick, without affecting the function and aesthetics of the original building. It is particularly suitable for urban renewal and renovation projects, with low maintenance costs and good long-term stability, providing longer-lasting protection and support for buildings. Attached Figure Description
[0027] Figure 1 This is a perspective view of a cantilever beam with additional bent reinforcement structure proposed in this utility model;
[0028] Figure 2 This is a schematic diagram of the embedded steel plate structure of the cantilever beam with additional bending reinforcement proposed in this utility model;
[0029] Figure 3 This is a schematic diagram of a pad block structure for an additional bent bar structure for a cantilever beam proposed in this utility model;
[0030] Figure 4 This is a schematic diagram of the main reinforcement structure of a cantilever beam with additional bent bars proposed in this utility model.
[0031] Legend:
[0032] 1. Cantilever beam; 2. Embedded steel plate; 3. Spacer block; 4. Main reinforcement; 5. Stirrup; 6. Cross reinforcement; 7. U-shaped anchoring reinforcement. Detailed Implementation
[0033] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0034] Reference Figures 1 to 3 This utility model provides an embodiment of a cantilever beam with additional bent reinforcement structure, comprising a cantilever beam 1 and two main reinforcing bars 4. The main reinforcing bars 4, as the primary tension elements, play a crucial role in this structure. Arranged at the bottom of the cantilever beam 1, they effectively withstand the tension generated by external loads, preventing the generation and development of cracks, thereby ensuring the integrity and stability of the structure. It is recommended that the main reinforcing bars 4 be HRB400 grade hot-rolled ribbed steel bars with a diameter of Φ16-25mm. The main reinforcing bars 4 are laid sequentially to the predetermined positions, adjusted to the correct height, and then temporarily fixed with binding wire. The outer surface of the main reinforcing bars 4 contacts the bottom of the pad block 3. A connecting assembly is provided at the bottom of the cantilever beam 1, comprising multiple embedded steel plates 2. In the early stages of construction, holes need to be drilled on the cantilever beam 1 according to the marked position lines, and then the embedded steel plates 2 are inserted into the holes, ensuring they are firmly fixed to the beam. Multiple embedded steel plates 2 are fixedly connected to the bottom of the cantilever beam 1. Each embedded steel plate 2 has two pads 3 fixedly connected to its bottom. The pads 3 are positioned between the main reinforcement 4 and the bottom of the beam. Their main function is to ensure the main reinforcement 4 maintains its correct positioning and prevents displacement or sinking during stress, thus affecting the structural load-bearing performance. The pads 3 can be made of high-strength polymer cement mortar in standard specifications. Multiple pads 3 are evenly distributed on the top of the main reinforcement 4, and stirrups 5 are evenly distributed on the outside of the main reinforcement 4.
[0035] Specifically, the main reinforcement 4 is located at the bottom of the cantilever beam 1, effectively bearing the tension generated by the external load to prevent cracks from appearing and developing. HRB400 grade hot-rolled ribbed steel bars with a diameter of Φ16-25mm are selected, laid sequentially, adjusted in height, and temporarily fixed with binding wire, with their exterior in contact with the bottom of the pad 3. A connecting assembly is provided at the bottom of the cantilever beam 1. Multiple embedded steel plates 2 of the connecting assembly need to be drilled and implanted according to the marked lines and firmly fixed to the beam body. Their bottoms are fixedly connected to the cantilever beam 1 and the pad 3. The pad 3 is located between the main reinforcement 4 and the bottom of the beam, made of standard-sized blocks of high-strength polymer cement mortar, ensuring the correct positioning of the main reinforcement 4 and preventing displacement or sinking under stress. The stirrups 5 are evenly distributed on the exterior of the main reinforcement 4. All components work together to ensure the normal stress and stability of the structure.
[0036] Reference Figures 2 to 4Multiple stirrups 5 are evenly distributed around the two main reinforcing bars 4, primarily used to restrict the lateral displacement of the main reinforcing bars 4, enhance the synergistic effect between the main reinforcing bars 4 and the concrete, and improve the overall stiffness and stability of the structure. During construction, the stirrups 5 must be tied to the outside of the main reinforcing bars 4 at specified intervals, and the tying must be secure to ensure that they can effectively restrain the main reinforcing bars 4. The placement of the stirrups 5 can also indirectly improve the load-bearing capacity and seismic performance of the entire structure by restraining the deformation of the core concrete area. The stirrups 5 are generally made of HPB300 grade plain round steel bars with a diameter of Φ8-12mm. The stirrups 5 are internally tied to the outside of the main reinforcement bars 4. A reinforcing assembly is provided on the adjacent side of the two main reinforcement bars 4. The reinforcing assembly includes multiple cross reinforcing bars 6, with their front and rear sides fixedly connected to the adjacent side of the two main reinforcement bars 4. The included angle between the cross reinforcing bars 6 is 30°. The cross reinforcing bars 6 and the stirrups 5 are located in the same plane as the main reinforcement bars 4. The main function of the cross reinforcing bars 6 is to further enhance the connection stability between the main reinforcement bars 4 and improve the torsional and bending resistance of the entire structure. When subjected to external loads, the cross reinforcing bars 6 can effectively share the force borne by the main reinforcement bars 4, making the force more evenly distributed within the structure, reducing the occurrence of local stress concentration, thereby enhancing the overall stability and load-bearing capacity of the structure. Cross-reinforcing ribs 6 are evenly distributed on the outside of the main reinforcement 4. Multiple U-shaped anchoring steel bars 7 are fixedly connected to the bottom of the connecting assembly. It is recommended that the U-shaped anchoring steel bars 7 be made of Q235 grade carbon structural steel with a diameter of Φ16mm or more. The inside of the U-shaped anchoring steel bars 7 is in contact with the outside of the main reinforcement 4. Both ends of the U-shaped anchoring steel bars 7 are welded to the bottom of the embedded steel plate 2, and the middle section passes through the skeleton formed by the main reinforcement 4 and stirrups 5, forming a closed loop. This allows the U-shaped anchoring steel bars 7 to connect the upper and lower stress zones. In the entire system, it not only withstands pressure but also acts as a conduit, making the force distribution more uniform and reasonable, effectively reducing the occurrence of local stress concentration. Furthermore, due to the presence of the U-shaped anchoring steel bars 7, even if some steel bars break in extreme cases, a new force transmission path can be quickly formed, thereby avoiding the risk of sudden structural collapse and greatly improving the safety and reliability of the structure.
[0037] Specifically, multiple stirrups 5 are evenly distributed outside the two main reinforcement bars 4. These are HPB300 grade plain round steel bars with a diameter of Φ8-12mm. During construction, they are firmly tied to the main reinforcement bars 4 at specified intervals, which restricts the lateral displacement of the main reinforcement bars 4, enhances the synergistic working ability between the main reinforcement bars 4 and the concrete, and improves the overall stiffness, stability, load-bearing capacity, and seismic performance of the structure. Simultaneously, a reinforcing component is set on the side of the two main reinforcement bars 4 that is close to each other. This component consists of multiple intersecting reinforcing bars 6 with an included angle of 30° and located in the same plane as the stirrups 5. These reinforcing bars are evenly distributed outside the main reinforcement bars 4 and are fixedly connected to the two main reinforcement bars 4 on the front and rear sides respectively. This further enhances the connection stability of the main reinforcement bars 4 and improves the structural resistance. The structure has strong torsional and bending resistance, which distributes the force of the main reinforcement 4, making the force distribution uniform, reducing stress concentration, and enhancing the overall stability and load-bearing capacity. In addition, the bottom of the connecting component is fixedly connected with multiple U-shaped anchoring steel bars 7 made of Q235 grade carbon structural steel with a diameter of Φ16mm or more. The two ends of the anchoring steel bars 7 are welded to the bottom of the pre-embedded steel plate 2, and the middle passes through the main reinforcement 4 and the stirrup 5 skeleton to form a closed loop. This can not only bear pressure and guide the flow, making the force distribution reasonable and reducing stress concentration, but also quickly form a new force transmission path when some steel bars break in extreme cases, avoiding sudden collapse of the structure. This greatly improves the safety and reliability of the structure. All components work together to ensure the stability and safety of the structure.
[0038] Working principle: First, measure and mark the position lines on the lower surface of the cantilever beam 1, accurately calculate the required quantity and length of various reinforcing bars, drill holes according to the marked position lines, insert the pre-embedded steel plate 2, and ensure that the steel plate is firmly fixed to the beam. Lay the processed main reinforcing bars 4 in sequence to the predetermined positions, adjust to the correct height, and then temporarily fix them with binding wire. Place spacers 3 along the main reinforcing bars 4, ensuring that the two are in close contact. Tie the stirrups 5 at the specified intervals, and tighten the binding wires one by one after checking that there are no errors. Finally, install the U-shaped anchoring steel bars 7 and weld their two ends to the fixed pre-embedded steel plate 2 to form a stable closed structure.
[0039] When the cantilever beam 1 is subjected to an external load, the main reinforcement 4, as the main tension element, bears the tension and prevents the generation and development of cracks. The stirrups 5 indirectly improve the overall stiffness and stability by restraining the deformation of the core concrete area. The U-shaped anchor reinforcement 7 plays the role of bearing pressure and guiding flow in the whole system. It connects the upper and lower stress zones, making the force distribution more uniform and reasonable, and reducing the occurrence of local stress concentration. In addition, the stability and support strength can be further enhanced by the cross reinforcement 6. Furthermore, due to the presence of the U-shaped anchor reinforcement 7, even if some reinforcement breaks in extreme cases, a new force transmission path can be quickly formed, thereby avoiding the risk of sudden structural collapse.
[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A cantilever beam with additional bent reinforcement structure, comprising a cantilever beam (1) and two main reinforcement bars (4), characterized in that: The bottom of the cantilever beam (1) is provided with a connecting component, and multiple stirrups (5) are provided on the outside of the two main bars (4). A reinforcing component is provided on the adjacent side of the two main bars (4), and multiple U-shaped anchor bars (7) are fixedly connected to the bottom of the connecting component.
2. The cantilever beam with additional bent reinforcement structure according to claim 1, characterized in that: The connecting assembly includes multiple embedded steel plates (2), the bottom of which is fixedly connected to the bottom of the cantilever beam (1), and the bottom of each of the multiple embedded steel plates (2) is fixedly connected to two pads (3).
3. The cantilever beam with additional bent reinforcement structure according to claim 1, characterized in that: The reinforcing component includes multiple cross reinforcing ribs (6), with the front and rear sides of the multiple cross reinforcing ribs (6) respectively fixedly connected to the adjacent side of the two main ribs (4), and the included angle between the cross reinforcing ribs (6) is 30°.
4. The cantilever beam with additional bent reinforcement structure according to claim 1, characterized in that: The inside of the stirrup (5) is tied to the outside of the main bar (4), and the inside of the U-shaped anchor bar (7) is in contact with the outside of the main bar (4).
5. A cantilever beam with additional bent reinforcement structure according to claim 2, characterized in that: The two ends of the U-shaped anchoring steel bar (7) are respectively welded to the bottom of the embedded steel plate (2), and the middle passes through the skeleton formed by the main bar (4) and the stirrup (5) to form a closed loop.
6. The cantilever beam with additional bent reinforcement structure according to claim 2, characterized in that: The main reinforcement bars (4) are laid in sequence to the predetermined position, adjusted to the correct height, and then temporarily fixed with binding wire. The outside of the main reinforcement bars (4) is in contact with the bottom of the pad block (3).
7. A cantilever beam with additional bent reinforcement structure according to claim 2, characterized in that: Multiple pads (3) are evenly distributed on the top of the main reinforcement (4), and the stirrups (5) are evenly distributed on the outside of the main reinforcement (4).
8. A cantilever beam with additional bent reinforcement structure according to claim 3, characterized in that: The cross reinforcing bars (6) and the stirrups (5) are located on the same plane as the main reinforcing bars (4), and the cross reinforcing bars (6) are evenly distributed outside the main reinforcing bars (4).