Steel bar anchoring structure

Abstract

The utility model discloses a steel bar anchoring structure which comprises an anchoring longitudinal bar set, a stress longitudinal bar, a first component and a second component, one end of the anchoring longitudinal bar set is connected with one end of the stress longitudinal bar in a welding mode in the second component, and the cross sectional area or the equivalent cross sectional area of the anchoring longitudinal bar set is larger than the cross sectional area of the stress longitudinal bar. A main body of the anchoring longitudinal bar set is embedded in the first component, one end of the anchoring longitudinal bar set is located in the second component, the main body, located in the first component, of the anchoring longitudinal bar set is a total anchoring section, the total anchoring section comprises a straight anchoring section and a bent anchoring section, and the part, located outside the first component, of the anchoring longitudinal bar set is a force transmission conversion section. The overall stress performance of the total anchoring section is optimized by arranging the anchoring longitudinal bar group and the force transmission conversion section, so that the straight anchoring length and the bent anchoring length of the anchoring longitudinal bar group can be shortened, and the total anchoring length requirement under the condition that the thickness of a shear wall is insufficient or the section width of a floor beam is too narrow is met.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, and in particular to a steel reinforcement anchoring structure. Background Technology

[0002] Reinforcement anchorage is a key technology in concrete structures to ensure the coordinated stress distribution between reinforcing steel and concrete. Its core functions include stress transfer, ensuring structural integrity, and preventing brittle failure. In building structures, a reinforcing steel cage is formed by binding and embedded in the structural members. The main body of the cage is usually located inside a member, while the anchorage section at the end of the cage extends into the interior of the adjacent member. This extension length is called the reinforcement anchorage length. The setting of the anchorage length must strictly adhere to the specifications (such as concrete strength, steel type, and diameter) to ensure effective stress transfer between the reinforcement and concrete, while maintaining the overall coordinated working performance between the support and the secondary member, preventing structural safety hazards caused by slippage or debonding.

[0003] In existing technologies, methods to reduce the total anchorage length of reinforcing bars can be adopted by strengthening the anchorage capacity at the ends. Specifically, this includes adding perforated plug-welded anchor plates or bolt anchor heads at the ends of the reinforcing bars, bending the reinforcing bars at the ends, and adding anchor bars welded to both sides at the ends of the reinforcing bars. However, while these methods reduce the total anchorage length, they do not reduce the straight anchorage length. The "Code for Design of Concrete Structures" GB 50010-2010 (hereinafter referred to as the Code) stipulates that the straight anchorage length of reinforcing bars should meet 40% of the total anchorage length in compression members (such as walls and columns in intermediate floors) and 60% of the total anchorage length in general non-compression members (such as top-floor walls, columns, or floor beams).

[0004] A problem encountered in practical engineering is that when the shear wall thickness is insufficient or the floor beam cross-section width is too narrow, the straight anchorage length of the longitudinal reinforcement at the beam end at the support often fails to meet the code requirements. Traditional solutions rely on structural adjustments such as increasing the wall thickness, widening the beam cross-section, or adding beam ends. While these can extend the anchorage area, they easily lead to reduced building space utilization and significantly increase the amount of main structural materials used and construction complexity. This utility model provides a reinforcement anchorage structure that can reduce the total anchorage length of the reinforcement and the straight anchorage length, and can also reduce the amount of work for components such as shear walls and floor beams to a certain extent. Utility Model Content

[0005] The main purpose of this utility model is to propose a steel reinforcement anchorage structure, which aims to solve the technical problem that the straight anchorage length of the longitudinal reinforcement at the support of the beam end is often difficult to meet the specifications when the thickness of the existing shear wall is insufficient or the width of the floor beam section is too narrow.

[0006] To achieve the above objectives, the present invention proposes a steel reinforcement anchorage structure, which includes a stressed longitudinal reinforcement, a first component, and a second component. The main body of the stressed longitudinal reinforcement is embedded in the second component. The structure also includes an anchoring longitudinal reinforcement group. One end of the anchoring longitudinal reinforcement group is welded to one end of the stressed longitudinal reinforcement in the second component. The cross-sectional area or equivalent cross-sectional area of ​​the anchoring longitudinal reinforcement group is greater than the cross-sectional area of ​​the stressed longitudinal reinforcement.

[0007] The main body of the anchoring longitudinal reinforcement group is embedded in the first component, and one end of it is located in the second component. The main body of the anchoring longitudinal reinforcement group located in the first component is the total anchoring section, which includes a straight anchoring section and a bent anchoring section. The part of the anchoring longitudinal reinforcement group located outside the first component is the force transmission and conversion section.

[0008] Optionally, the first component is a wall, column, or beam, and the second component is a beam or slab.

[0009] Optionally, the anchoring longitudinal reinforcement group is a first anchoring longitudinal reinforcement, one end of the first anchoring longitudinal reinforcement is butt-welded to one end of the stressed longitudinal reinforcement in the second component, and the cross-sectional area of ​​the first anchoring longitudinal reinforcement is larger than the cross-sectional area of ​​the stressed longitudinal reinforcement.

[0010] Optionally, the length of the straight anchorage section is greater than or equal to the existing straight anchorage length;

[0011] The current straight anchorage length = original straight anchorage length × (perimeter of stressed longitudinal reinforcement / perimeter of first anchorage longitudinal reinforcement).

[0012] Optionally, the length of the bent anchoring section is greater than or equal to the current bent anchoring length;

[0013] The length of the current bent anchorage section = the original bent anchorage length × (circumference of the stressed longitudinal reinforcement / circumference of the first anchorage longitudinal reinforcement).

[0014] Optionally, the length of the force conversion section is greater than or equal to the force conversion length;

[0015] Force transfer length = 4 to 6 × (diameter of the first anchoring longitudinal bar d1 - diameter of the stressed longitudinal bar d0).

[0016] Optionally, the anchoring longitudinal bar group consists of a second anchoring longitudinal bar and a third anchoring longitudinal bar. The second anchoring longitudinal bar is an extension of the stressed longitudinal bar extending from the second member to the interior of the first member. The third anchoring longitudinal bar is an additional anchoring longitudinal bar. The cross-sectional area of ​​the second anchoring longitudinal bar is greater than or equal to the cross-sectional area of ​​the third anchoring longitudinal bar.

[0017] The second anchoring longitudinal bar and the third anchoring longitudinal bar are lapped and welded within the second member, and the equivalent cross-sectional area of ​​the second anchoring longitudinal bar and the third anchoring longitudinal bar is greater than the cross-sectional area of ​​the stressed longitudinal bar.

[0018] Optionally, the length of the straight anchorage section is greater than or equal to the existing straight anchorage length;

[0019] The current straight anchorage length = original straight anchorage length × [perimeter of stressed longitudinal reinforcement / (perimeter of second anchorage longitudinal reinforcement + 0.75 × perimeter of third anchorage longitudinal reinforcement)].

[0020] Optionally, the length of the bent anchoring section is greater than or equal to the current bent anchoring length;

[0021] The length of the current bent anchorage section = the original bent anchorage length × [the perimeter of the stressed longitudinal reinforcement / (the perimeter of the second anchorage longitudinal reinforcement + 0.75 × the perimeter of the third anchorage longitudinal reinforcement)].

[0022] Optionally, the length of the force conversion section is greater than or equal to the force conversion length;

[0023] Force transfer length = 4 to 6 × diameter of the third anchoring longitudinal bar.

[0024] The technical solution of this utility model has the following beneficial effects: By setting up the anchoring longitudinal reinforcement group and the force transfer section, the force transfer section can evenly diffuse the stress concentrated by the second component and the stressed longitudinal reinforcement to the entire cross section of the anchoring longitudinal reinforcement group, thereby significantly reducing the peak value of concrete bond stress and avoiding abnormal increase in local bending moment of the first component due to anchoring stress transmission, thus maintaining the original structural bending bearing capacity unchanged.

[0025] Once the anchoring longitudinal reinforcement group enters the first structural member, its larger cross-sectional area or equivalent cross-sectional area allows for sufficient anchorage even with a shortened straight anchorage length, while the bent anchorage length is also proportionally reduced along the perimeter. This optimizes the overall stress performance of the total anchorage section and shortens the required straight and bent anchorage lengths when the anchoring longitudinal reinforcement group is anchored into the first structural member. This addresses the issue that the straight anchorage length of the beam-end longitudinal reinforcement at the support often fails to meet code requirements when the shear wall thickness is insufficient or the floor beam cross-section width is too narrow. Therefore, there is no need to increase wall thickness, widen beam cross-sections, or add beam ends, thereby improving the utilization rate of building space and avoiding increased material usage and construction complexity in the main structure. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0027] Figure 1This is a schematic diagram of the structural design of a steel bar anchorage structure according to Embodiment 1 of the present invention;

[0028] Figure 2 for Figure 1 Cross-sectional view of section AA;

[0029] Figure 3 This is a schematic diagram of the structural design of a second embodiment of the steel bar anchoring structure of this utility model;

[0030] Figure 4 for Figure 3 Cross-sectional view of section BB in the middle.

[0031] The following are the reference numerals: 1. First component; 2. Second component; 3. Reinforcing longitudinal bar; 4. First anchoring longitudinal bar; 5. Second anchoring longitudinal bar; 6. Third anchoring longitudinal bar; 7. Butt weld; 8. Lap weld; 9. Flux.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. 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] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This utility model proposes a steel reinforcement anchorage structure.

[0037] like Figures 1 to 2As shown in Embodiment 1 of this utility model, the steel reinforcement anchorage structure includes an anchoring longitudinal reinforcement group, a stressed longitudinal reinforcement, a first component, and a second component. One end of the anchoring longitudinal reinforcement group is welded to one end of the stressed longitudinal reinforcement within the second component. The cross-sectional area or equivalent cross-sectional area of ​​the anchoring longitudinal reinforcement group is larger than the cross-sectional area of ​​the stressed longitudinal reinforcement. Specifically, the main body of the anchoring longitudinal reinforcement group is embedded within the first component, with one end located within the second component. The main body of the anchoring longitudinal reinforcement group within the first component constitutes the total anchorage section, which includes a straight anchorage section and a bent anchorage section. The portion of the anchoring longitudinal reinforcement group outside the first component is the force transmission conversion section. Further, the main body of the aforementioned stressed longitudinal reinforcement is embedded within the second component.

[0038] It is worth noting that the aforementioned force transfer section is located outside the first member, forming a stress transition zone across members, thereby achieving stress homogenization and bending decoupling. Specifically, before the anchored longitudinal reinforcement group enters the first member, the concentrated stress of the stressed longitudinal reinforcement is gradually diffused through the force transfer section, transforming it into uniformly distributed interfacial shear stress, thus achieving stress homogenization. Furthermore, through the design of the external force transfer path, abnormal increases in local bending moment of the first member due to anchorage stress transmission can be avoided, thereby maintaining the original structural bending bearing capacity unchanged.

[0039] Specifically, the first component is a wall, column, or beam, and the second component is a beam or slab. In other embodiments, the first and second components may also be similar components other than walls, columns, beams, or slabs.

[0040] In this embodiment, the anchoring longitudinal bar group is specifically the first anchoring longitudinal bar. One end of the first anchoring longitudinal bar is welded to one end of the stressed longitudinal bar inside the second component. The cross-sectional area of ​​the first anchoring longitudinal bar is larger than the cross-sectional area of ​​the stressed longitudinal bar.

[0041] Specifically, the length of the aforementioned straight anchorage section is greater than or equal to the current straight anchorage length; the current straight anchorage length = the original straight anchorage length × (perimeter of the stressed longitudinal reinforcement / perimeter of the first anchorage longitudinal reinforcement).

[0042] Specifically, the length of the aforementioned bent anchorage section is greater than or equal to the current bent anchorage length; the length of the current bent anchorage section = the original bent anchorage length × (perimeter of the stressed longitudinal reinforcement / perimeter of the first anchorage longitudinal reinforcement).

[0043] Specifically, the length of the aforementioned force transfer section is greater than or equal to the force transfer length; the force transfer length = 4 to 6 × (diameter of the first anchoring longitudinal bar d1 - diameter of the stressed longitudinal bar d0).

[0044] Furthermore, the original specification defines the straight anchorage length as the required straight anchorage length for the end of the stressed longitudinal reinforcement extending into the first member, as specified in the "Code for Design of Concrete Structures" GB 50010-2010 (hereinafter referred to as the "Code"). Even further, the perimeter of the stressed longitudinal reinforcement is the contact length between its outer surface and the concrete, i.e., π×d0, where d0 is the diameter of the stressed longitudinal reinforcement; the perimeter of the first anchorage longitudinal reinforcement is the contact length between its outer surface and the concrete, i.e., π×d1, where d1 is the diameter of the first anchorage longitudinal reinforcement.

[0045] Example 2

[0046] like Figure 3 and 4 As shown, the difference in this embodiment lies in that: the anchoring longitudinal reinforcement group consists of a second anchoring longitudinal reinforcement and a third anchoring longitudinal reinforcement, wherein the second anchoring longitudinal reinforcement is an extension of the stressed longitudinal reinforcement extending from the second member to the interior of the first member, and the third anchoring longitudinal reinforcement is an additional anchoring longitudinal reinforcement; and the cross-sectional area of ​​the second anchoring longitudinal reinforcement is greater than or equal to the cross-sectional area of ​​the third anchoring longitudinal reinforcement.

[0047] In this embodiment, the second anchoring longitudinal bar and the third anchoring longitudinal bar are lap-welded in the second component by flux, and the equivalent cross-sectional area of ​​the second anchoring longitudinal bar and the third anchoring longitudinal bar is greater than the cross-sectional area of ​​the stressed longitudinal bar.

[0048] Specifically, the length of the aforementioned straight anchorage section is greater than or equal to the current straight anchorage length; current straight anchorage length = original straight anchorage length × [perimeter of stressed longitudinal reinforcement / (perimeter of second anchorage longitudinal reinforcement + 0.75 × perimeter of third anchorage longitudinal reinforcement)].

[0049] Specifically, the length of the aforementioned bent anchorage section is greater than or equal to the current bent anchorage length; the length of the current bent anchorage section = the original bent anchorage length × [perimeter of the stressed longitudinal reinforcement / (perimeter of the second anchorage longitudinal reinforcement + 0.75 × perimeter of the third anchorage longitudinal reinforcement)].

[0050] Specifically, the length of the aforementioned force transfer section is greater than or equal to the force transfer length; the force transfer length = 4 to 6 × the diameter of the third anchoring longitudinal bar.

[0051] Furthermore, the perimeter of the second anchoring longitudinal bar is the contact length between the outer surface of the second anchoring longitudinal bar and the concrete, i.e., π×d2, where d2 is the diameter of the second anchoring longitudinal bar. The perimeter of the third anchoring longitudinal bar is the contact length between the outer surface of the third anchoring longitudinal bar and the concrete, i.e., π×d3, where d3 is the diameter of the third anchoring longitudinal bar.

[0052] The working principle and process of this utility model are as follows:

[0053] This invention optimizes the overall stress performance of the total anchorage section by setting up anchorage longitudinal reinforcement groups and force transfer sections. This shortens the required straight and bent anchorage lengths when the anchorage longitudinal reinforcement groups are anchored into the first component, solving the problem that the straight anchorage length of the beam end longitudinal reinforcement at the support often fails to meet code requirements when the shear wall thickness is insufficient or the floor beam cross-section width is too narrow. Therefore, there is no need to increase wall thickness, widen beam cross-sections, or add beam ends for structural adjustments, thereby improving the utilization rate of building space and avoiding increased material usage and construction complexity in the main structure.

[0054] Specifically, the anchorage longitudinal reinforcement group outside the first component is designated as a force transfer section. Through this section, the concentrated stress of the second component and the stressed longitudinal reinforcement is evenly distributed to the entire cross-section of the anchorage longitudinal reinforcement group, thereby significantly reducing the peak value of concrete bond stress. Furthermore, the external force transfer path design avoids abnormal increases in local bending moment of the first component due to anchorage stress transmission, thus maintaining the original structural flexural bearing capacity unchanged.

[0055] Once the anchoring longitudinal reinforcement group enters the first structural member, its larger cross-sectional area or equivalent cross-sectional area allows for sufficient anchorage even with a shortened straight anchorage length, while the bent anchorage length is also reduced proportionally to the perimeter. Ultimately, the anchoring longitudinal reinforcement group and the concrete of the first structural member work together to maintain the original structural flexural bearing capacity while avoiding additional bending moment disturbances, ensuring the overall stability of mechanical properties.

[0056] By optimizing stress distribution, the straight anchorage length can be reduced to less than 60% of the standard requirement (e.g., if the standard requires ≥0.6lab, this invention can reduce it to 0.35lab~0.4lab), and the total anchorage length is reduced by about 30%~50%. Furthermore, compared to mechanical anchorage technology (which reduces anchorage length by 40%), this invention further combines welding synergy, saving structural space and cost (avoiding the need to thicken supports (e.g., beam ends or wall thickness) due to insufficient anchorage length, reducing concrete usage and formwork work; and eliminating the complex process of locally setting beam heads or structural columns, reducing labor and material costs), and improving construction convenience (the welding process is simple, requires no special equipment, and is suitable for narrow construction spaces; and the anchorage longitudinal reinforcement group can be prefabricated, resulting in high on-site assembly efficiency and reduced construction time) and reliability (the dual anchorage mechanism (welding + support anchorage) improves seismic performance, especially suitable for high-intensity seismic zones or large-span structures), resulting in superior performance.

[0057] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A reinforced concrete anchorage structure, comprising longitudinal reinforcing bars, a first component, and a second component, wherein the main body of the longitudinal reinforcing bars is embedded within the second component, characterized in that, It also includes an anchoring longitudinal reinforcement group, one end of which is welded to one end of the stressed longitudinal reinforcement in the second component, and the cross-sectional area or equivalent cross-sectional area of ​​the anchoring longitudinal reinforcement group is greater than the cross-sectional area of ​​the stressed longitudinal reinforcement. The main body of the anchoring longitudinal reinforcement group is embedded in the first component, and one end of it is located in the second component. The main body of the anchoring longitudinal reinforcement group located in the first component is the total anchoring section, which includes a straight anchoring section and a bent anchoring section. The part of the anchoring longitudinal reinforcement group located outside the first component is the force transmission and conversion section.

2. The steel reinforcement anchorage structure according to claim 1, characterized in that, The first component is a wall, column, or beam, and the second component is a beam or slab.

3. The steel reinforcement anchorage structure according to claim 1, characterized in that, The anchoring longitudinal bar group is the first anchoring longitudinal bar. One end of the first anchoring longitudinal bar is welded to one end of the stressed longitudinal bar inside the second component. The cross-sectional area of ​​the first anchoring longitudinal bar is larger than the cross-sectional area of ​​the stressed longitudinal bar.

4. The steel reinforcement anchorage structure according to claim 3, characterized in that, The length of the straight anchorage section is greater than or equal to the current straight anchorage length; The current straight anchorage length = original straight anchorage length × (perimeter of stressed longitudinal reinforcement / perimeter of first anchorage longitudinal reinforcement).

5. The steel reinforcement anchorage structure according to claim 3, characterized in that, The length of the bent anchorage section is greater than or equal to the current bent anchorage length; The length of the current bent anchorage section = the original bent anchorage length × (circumference of the stressed longitudinal reinforcement / circumference of the first anchorage longitudinal reinforcement).

6. The steel reinforcement anchorage structure according to claim 3, characterized in that, The length of the force conversion section is greater than or equal to the force conversion length; Force transfer length = 4 to 6 × (diameter of the first anchoring longitudinal bar d1 - diameter of the stressed longitudinal bar d0).

7. The steel reinforcement anchorage structure according to claim 1, characterized in that, The anchoring longitudinal bar group consists of a second anchoring longitudinal bar and a third anchoring longitudinal bar. The second anchoring longitudinal bar is an extension of the stressed longitudinal bar extending from the second component to the interior of the first component. The third anchoring longitudinal bar is an additional anchoring longitudinal bar. The cross-sectional area of ​​the second anchoring longitudinal bar is greater than or equal to the cross-sectional area of ​​the third anchoring longitudinal bar. The second anchoring longitudinal bar and the third anchoring longitudinal bar are lapped and welded within the second member, and the equivalent cross-sectional area of ​​the second anchoring longitudinal bar and the third anchoring longitudinal bar is greater than the cross-sectional area of ​​the stressed longitudinal bar.

8. The steel reinforcement anchorage structure according to claim 7, characterized in that, The length of the straight anchorage section is greater than or equal to the current straight anchorage length; The current straight anchorage length = original straight anchorage length × [perimeter of stressed longitudinal reinforcement / (perimeter of second anchorage longitudinal reinforcement + 0.75 × perimeter of third anchorage longitudinal reinforcement)].

9. The steel reinforcement anchorage structure according to claim 7, characterized in that, The length of the bent anchorage section is greater than or equal to the current bent anchorage length; The length of the current bent anchorage section = the original bent anchorage length × [the perimeter of the stressed longitudinal reinforcement / (the perimeter of the second anchorage longitudinal reinforcement + 0.75 × the perimeter of the third anchorage longitudinal reinforcement)].

10. The steel reinforcement anchorage structure according to claim 7, characterized in that, The length of the force conversion section is greater than or equal to the force conversion length; Force transfer length = 4 to 6 × diameter of the third anchoring longitudinal bar.

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