Anchorage node for reinforcing longitudinal reinforcement of a beam when the anchorage length is insufficient

Abstract

This utility model discloses an anchorage node for beam reinforcement when the longitudinal reinforcement anchorage length is insufficient. It includes additional top reinforcement and additional bottom reinforcement. The additional top reinforcement is laid on the top chiseled surface of the structural floor slab, with its anchorage end bent downwards at the outer facade of the main beam away from the secondary beams. The bent section penetrates the structural floor slab and is welded to an anchorage steel plate located on the outer facade of the main beam. The additional bottom reinforcement's anchorage end penetrates the main beam and is welded to an anchorage steel plate located on the outer facade of the main beam. This utility model has a simple structure and ingenious design. By adding anchorage steel plates and using mechanical and welding methods as reinforcement measures, it meets the anchorage node requirements. While ensuring the beam's load-bearing capacity, stability, and seismic performance, it effectively reduces construction difficulty, facilitates manual operation, and ensures controllable reinforcement quality, making it highly applicable.

Description

Technical Field

[0001] This utility model relates to the field of structural modification construction technology, specifically to an anchoring node when the anchoring length of longitudinal reinforcement bars in a beam is insufficient. Background Technology

[0002] When renovating existing buildings, changes in function often render the original frame beams unable to meet current requirements. To ensure structural safety, reinforcement of the frame beams is necessary, often achieved by increasing their cross-section. When using this method, the longitudinal reinforcement corresponding to the newly added bottom and top bars in the secondary beams is typically anchored directly within the main beam. However, in some construction scenarios, the dimensions of the main beam may limit the direct anchorage length of the reinforcement. In such cases, additional anchorage techniques are needed at the ends of the main beam to ensure the rebar installation meets the anchorage connection requirements. Current practices usually involve thickening the concrete along the sides of the main beam to ensure sufficient anchorage length for the secondary beam's longitudinal reinforcement. However, this requires re-reinforcing the main beam, erecting formwork, and pouring concrete, resulting in complex construction techniques and additional costs. Utility Model Content

[0003] The purpose of this utility model is to propose an anchorage node for beam reinforcement longitudinal bars when the anchorage length is insufficient, so as to solve the technical problems described in the background art.

[0004] To achieve the above technical objectives, the present invention adopts the following technical solution: An anchoring joint for beam reinforcement when the longitudinal reinforcement anchorage length is insufficient includes additional top reinforcement and additional bottom reinforcement. The additional top reinforcement is laid on the top chiseled surface of the structural floor slab, and its anchoring end is bent downward at the outer facade of the main structural beam away from the secondary structural beam. The bent section penetrates the structural floor slab and is welded and fixed to the anchoring steel plate set at the outer facade of the main structural beam. The anchoring end of the additional bottom reinforcement penetrates the main structural beam and is welded and fixed to the anchoring steel plate set at the outer facade of the main structural beam.

[0005] Preferably, the newly added bottom reinforcement includes an integrally connected first horizontal segment, an inclined bending segment, and a second horizontal segment. The inclined bending segment is located at the end of the secondary structural beam near the main structural beam, and the horizontal bending length L of the inclined bending segment is not less than 6 times the vertical bending height H.

[0006] Preferably, the anchoring steel plate corresponding to the anchoring end of the newly added top reinforcement is fixed to the main structural beam by means of expansion bolts, chemical anchors or rebar installation, and the anchoring end of the newly added bottom reinforcement is welded to the corresponding anchoring steel plate by means of through-hole plug welding.

[0007] Preferably, the anchoring steel plate is fixed to the outer facade of the main structural beam by structural adhesive.

[0008] Preferably, the exposed anchoring steel plates, newly added top reinforcement bars, and newly added bottom reinforcement bars on the outer facade of the main structural beam are coated with anti-corrosion and fireproof paint.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model has a simple structure and ingenious design. It adopts the method of adding anchoring steel plates and uses mechanical and welding methods as reinforcement measures to meet the requirements of anchoring nodes. While ensuring the load-bearing capacity, stability and seismic performance of the beam, it effectively reduces the construction difficulty, facilitates manual operation and makes the reinforcement quality controllable, and has strong applicability. Attached Figure Description

[0010] The above and / or other aspects and advantages of this invention will become clearer and more readily understood through the following detailed description taken in conjunction with the accompanying drawings, which are merely illustrative and do not limit the invention, wherein: Figure 1 This is a structural schematic diagram of an anchorage node for beam reinforcement when the anchorage length of the longitudinal reinforcement is insufficient, which is related to this utility model.

[0011] Attached reference numerals: 1. Main structural beam; 2. Secondary structural beam; 3. Structural floor slab; 4. New top reinforcement; 5. New stirrups; 6. New bottom reinforcement; 601. First horizontal section; 602. Inclined bending section; 603. Second horizontal section; 7. Anchor steel plate; 8. Rebar installation. Detailed Implementation

[0012] In the following description, an embodiment of the anchorage node for beam reinforcement longitudinal bars when the anchorage length is insufficient will be presented with reference to the accompanying drawings. The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the present invention, and are illustrative and exemplary, and should not be construed as limiting the implementation or scope of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0013] In the description of this utility model, it should be noted that the terms "front," "rear," "left," "right," "top," "bottom," "upper," "lower," "inner," "outer," "horizontal," "vertical," "upright," and "oblique," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0014] The accompanying drawings in this specification are schematic diagrams used to illustrate the concept of this utility model, and schematically show the shapes of the various parts and their interrelationships. Please note that, in order to clearly show the structure of the components of the embodiments of this utility model, the drawings are not drawn to the same scale. The same reference numerals are used to indicate the same parts.

[0015] The principles and features of this utility model are described below with reference to the accompanying drawings. The embodiments described are only for explaining this utility model and are not intended to limit the scope of this utility model. The following description, in conjunction with... Figure 1 The preferred embodiments of this utility model will be described in further detail below: like Figure 1 As shown, the preferred anchoring node for beam reinforcement longitudinal reinforcement when the anchoring length is insufficient includes an additional top reinforcement 4 and an additional bottom reinforcement 6. The additional top reinforcement 4 is laid on the top chiseled surface of the structural floor slab 3, and its anchoring end is bent downward at the outer facade of the main structural beam 1 away from the secondary structural beam 2. Its bent section penetrates the structural floor slab 3 and is welded and fixed to the anchoring steel plate 7 set at the outer facade of the main structural beam 1. The newly added bottom reinforcement 6 is anchored through the main structural beam 1 and welded to the anchoring steel plate 7 set on the outer facade of the main structural beam 1. Considering that in some construction scenarios, the vertical cross-sectional dimensions of the main structural beam 1 may be insufficient, the bottom elevation of the secondary structural beam 2 after the cross-section is enlarged may be lower than the bottom elevation of the main structural beam 1, resulting in the newly added bottom reinforcement 6 not being able to horizontally penetrate the main structural beam 1. Therefore, the newly added bottom reinforcement 6 of the secondary structural beam 2 needs to be bent upward near the main structural beam 1. At this time, the newly added bottom reinforcement 6 includes an integrally connected first horizontal segment 601, an inclined bending segment 602, and a second horizontal segment 603. The inclined bending segment 602 is set at the end of the secondary structural beam 2 near the main structural beam 1, and the horizontal bending length L of the inclined bending segment 602 is not less than 6 times the vertical bending height H, that is, Figure 1 In the case where H / L≤1 / 6, the bending angle of the inclined bending section 602 should not be too large to ensure that the newly added bottom reinforcement 6 has good stress performance; The anchoring steel plate 7 needs to be pasted to the designed position on the outer facade of the main structural beam 1 with structural adhesive before anchoring. The fine aggregate concrete on the outer side of the main structural beam 1 needs to be removed in advance to expose the coarse aggregate concrete of the beam body to ensure the bonding strength of the structural adhesive. The anchoring steel plate 7 corresponding to the anchoring end of the newly added top reinforcement 4 is fixed to the main structural beam 1 by expansion bolts, chemical anchors or rebar 8. The anchoring end of the newly added bottom reinforcement 6 is welded to the corresponding anchoring steel plate 7 by through-hole plug welding. The newly added bottom reinforcement 6 also serves as the anchoring reinforcement of the corresponding anchoring steel plate 7. Of course, the exposed anchoring steel plate 7, the newly added top reinforcement 4, and the newly added bottom reinforcement 6 on the outer facade of the main structural beam 1 all need to be coated with anti-corrosion and fireproof paint for anti-corrosion and fireproof treatment.

[0016] During construction of this utility model, the surfaces of the original main beam 1 and secondary beam 2 need to be roughened and grooved manually or mechanically to expose the original beam stirrups. For the newly added reinforcing bars 4 with insufficient anchorage length, an anchoring steel plate 7 is first fixed to the top of the beam at the junction of the main beam 1 and the structural floor slab 3 using structural adhesive. The anchoring steel plate 7 can be fixed to the main beam 1 using expansion bolts, chemical anchors, or rebar 8. When fixed by rebar 8, the rebar 8 and the anchoring steel plate 7 are connected and fixed by through-hole plug welding. After that, the reinforcement is placed close to the structure. Holes are drilled in the structural floor slab 3 at the corresponding position on the outer side of the main beam 1 to allow the newly added reinforcing bar 4 to extend downwards. Simultaneously, the newly added reinforcing bar 4 is bent downwards at 90° at the drilled hole, and the bent section extends downwards into the lower opening of the hole and is fixed to the anchoring steel plate 7 by double-sided welding for anchoring. The length of the downward-bent section of the newly added reinforcing bar 4 must meet 10d (d is the diameter of the newly added reinforcing bar 4), and the weld length between the newly added reinforcing bar 4 and the anchoring steel plate 7 must meet 5d (d is the diameter of the newly added reinforcing bar 4). When installing the new bottom reinforcing bar 6, it is necessary to first install it at the corresponding anchor... Holes are drilled in the steel plate 7 and it is fixed to the main structural beam 1 with structural adhesive. Before the new bottom reinforcement 6 is installed, its end is bent at a ratio of 1:6 to form an inclined bending section 602. The second horizontal section 603 behind the inclined bending section 602 is inserted into and extends out of the main structural beam 1. Then, it is connected to the anchoring steel plate 7 pre-installed on the outer facade of the main structural beam 1 by through-hole plug welding to achieve the anchoring effect. The length of the new bottom reinforcement 6 after bending and being inserted into the beam is generally 20d (d is the diameter of the new bottom reinforcement 6), and it meets the design calculation requirements. 7 is made of steel plate with a thickness calculated according to the design. Among them, the anchoring steel plate 7 at the position of the newly added top reinforcement 4 can be 150×8mm, and the width is generally the beam width + 300mm. The anchoring steel plate 7 at the position of the newly added bottom reinforcement 6 can be 100×25mm, and the width is the beam width + 150mm. After the newly added top reinforcement 4 and the newly added bottom reinforcement 6 are set up, the newly added stirrups 5 are tied according to the design requirements, and the formwork is erected and the concrete of the newly added beam is poured. Finally, all the exposed steel bars and anchoring steel plates 7 on the outer facade of the main beam 1 are treated with fireproofing and anti-corrosion.

[0017] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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. An anchorage joint for beam reinforcement longitudinal bars when the anchorage length is insufficient, characterized in that: The new reinforcement includes a top reinforcement (4) and a bottom reinforcement (6). The top reinforcement (4) is laid on the top chiseled surface of the structural floor slab (3). Its anchoring end is bent downward at the outer facade of the main structural beam (1) away from the secondary structural beam (2). Its bent section passes through the structural floor slab (3) and is welded and fixed to the anchoring steel plate (7) set at the outer facade of the main structural beam (1). The anchoring end of the bottom reinforcement (6) passes through the main structural beam (1) and is welded and fixed to the anchoring steel plate (7) set at the outer facade of the main structural beam (1).

2. The anchorage joint for insufficient anchorage length of longitudinal reinforcement in beam reinforcement according to claim 1, characterized in that: The newly added bottom reinforcement (6) includes an integrally connected first horizontal section (601), an inclined bending section (602), and a second horizontal section (603). The inclined bending section (602) is located at the end of the secondary structural beam (2) near the main structural beam (1), and the horizontal bending length L of the inclined bending section (602) is not less than 6 times the vertical bending height H.

3. The anchorage joint for insufficient anchorage length of longitudinal reinforcement in beam reinforcement according to claim 1, characterized in that: The anchoring steel plate (7) corresponding to the anchoring end of the newly added top reinforcement (4) is fixed to the main beam (1) of the structure by means of expansion bolts, chemical anchors or rebar (8). The anchoring end of the newly added bottom reinforcement (6) is welded to the corresponding anchoring steel plate (7) by means of through-hole plug welding.

4. The anchorage joint for insufficient anchorage length of longitudinal reinforcement in beam reinforcement according to claim 3, characterized in that: The anchoring steel plate (7) is fixed to the outer facade of the main structural beam (1) by structural adhesive.

5. The anchorage joint for insufficient anchorage length of longitudinal reinforcement in beam reinforcement according to claim 1, characterized in that: The exposed anchoring steel plate (7), newly added top reinforcement (4), and newly added bottom reinforcement (6) of the main structural beam (1) are coated with anti-corrosion and fireproof paint.

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