A full assembly type building beam-column joint based on corbel cantilever

Abstract

The application discloses a full-assembly building beam-column joint based on a bracket cantilever and belongs to the technical field of assembly building structures. The full-assembly building beam-column joint comprises a prefabricated vertical column, a prefabricated bracket and a prefabricated beam, the prefabricated bracket is arranged on the side wall of the prefabricated vertical column, and the end of the prefabricated beam is supported on the prefabricated bracket; a force transmission mechanism is further arranged, one end of the force transmission mechanism is connected with the end of the prefabricated beam, the other end of the force transmission mechanism penetrates through the prefabricated vertical column and is connected with a dispersion plate opposite to the prefabricated vertical column, and the cantilever stress generated by the prefabricated beam is transmitted and dispersed to the vertical surface opposite to the prefabricated vertical column. The full-assembly building beam-column joint changes the unilateral stress mode of the traditional bracket joint, realizes balanced stress of the full cross section of the vertical column, effectively reduces stress concentration of the joint, and is convenient to assemble, reliable in stress, and strong in integrity.

Description

Technical Field

[0001] This invention relates to the field of prefabricated buildings, specifically to a beam-column joint for fully prefabricated buildings based on corbel cantilever. Background Technology

[0002] Currently, in prefabricated concrete frame structures, cantilever components (such as cantilever beams, cantilever slabs, and balcony slabs) are typically assembled using corbel supports. The corbel, as the main load-bearing component, bears the vertical pressure and overturning moment transmitted from the cantilever component and transfers the internal forces to the columns.

[0003] Existing corbel joints, regardless of whether they employ exposed, concealed, steel, or combined corbel forms, all exhibit a common force transmission path: the internal forces generated by the cantilever act only on the single-sided facade connecting the column and the corbel. The force distribution is highly concentrated in a localized area of ​​the joint, unable to diffuse across the entire column cross-section, let alone be transmitted to the opposite side of the column. This unilateral force-bearing pattern leads to a significant increase in shear and bending stress in the joint area, especially at the corbel root, making it prone to root cracking, localized crushing, and joint failure.

[0004] To overcome the safety hazards caused by stress concentration, the industry generally adopts a "strong node, weak component" design approach. This involves strengthening the node area by increasing the node cross-section, reinforcing the reinforcement, and increasing the concrete strength grade. However, this results in bulky node structures, increased prefabrication difficulty, and reduced assemblability. Although existing technologies have developed various improvement solutions such as dry connections, bolted connections, welded reinforcement, and built-in steel sections, none of them have changed the fundamental defects of unilateral stress and localized bearing. They cannot effectively transfer the cantilever internal forces to the opposite side of the column from the stress mechanism perspective, and it is difficult to eliminate stress concentration at the node from the root cause.

[0005] Meanwhile, traditional corbel systems rely on the strength of the nodes themselves to resist bending moments, failing to utilize the overall cross-section of the column for balanced stress distribution, thus failing to fully utilize the column material properties. How to effectively transfer the internal forces generated by cantilever components from one side of the load-bearing surface to the opposite side of the column, achieving balanced stress distribution across the entire column, weakening the nodes, and reducing stress concentration, has become a key technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a fully prefabricated building beam-column joint based on a corbel cantilever, which effectively transfers part of the force from the cantilever beam to the opposite side of the column, achieving balanced force distribution across the entire column and fundamentally reducing stress concentration at the joint.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is: a fully prefabricated building beam-column joint based on corbel cantilever, comprising a prefabricated column, a prefabricated corbel, and a prefabricated beam; the prefabricated corbel is set on the side wall of the prefabricated column; the end of the prefabricated beam is supported on the prefabricated corbel, and the prefabricated corbel forms end support for the prefabricated beam.

[0008] It also includes a force transmission mechanism, one end of which is connected to the end of the precast beam, and the other end passes through the precast column and is connected to a dispersion plate set on the opposite side of the precast column, so as to disperse the cantilever stress from the precast beam to the opposite side of the precast column through the dispersion plate.

[0009] Preferably, the force transmission mechanism is a rigid steel plate force transmission mechanism, which connects the end of the precast beam and the dispersion plate on the opposite side of the precast column through a steel plate component that bypasses the precast column.

[0010] Preferably, the steel plate component is a U-shaped steel plate that is semi-enclosed and covers the precast column; one side of the U-shaped steel plate extends upward / downward to form a dispersion plate that contacts the opposite side of the precast column, and the other side is connected to the end face of the precast beam.

[0011] Preferably, the force transmission mechanism is a steel cable force transmission mechanism, which connects the end of the precast beam and the dispersion plate on the opposite side of the precast column through a steel cable component passing through the precast column.

[0012] Preferably, the steel cable component includes a cable body and a fixing head. One end of the cable body is anchored to the distribution plate, and the other end passes through the precast column and is installed in the end of the precast beam through the fixing head.

[0013] Preferably, the precast column includes an upper column and a lower column. The lower end of the upper column is covered with an upper column-encasing steel fixedly connected to the upper column, and the upper end of the lower column is covered with a lower column-encasing steel fixedly connected to the lower column. The precast bracket is formed by steel plates arranged on the side wall of the lower column-encasing steel, and the precast bracket and the lower column-encasing steel form an integral structure.

[0014] An insertable steel column is provided between the upper and lower cladding steel columns. The opposite end faces of the upper and lower cladding steel columns are provided with concave insertion grooves that mate with the insertable steel column. Two flanges are provided on the circumference of the insertable steel column. The two ends of the insertable steel column are inserted into the insertion grooves. The two flanges on the insertable steel column are respectively attached to the end faces of the upper and lower cladding steel columns and locked by column end bolts.

[0015] The dispersion plate is L-shaped, with its vertical edge abutting against the side wall of the upper column steel and locked to the upper column steel by column side bolts. The horizontal edge of the dispersion plate is set on the top surface of the precast bracket on the same side and locked to the precast bracket by bracket bolts.

[0016] One end of the cable of the steel cable component is anchored to the vertical edge of the dispersion plate on one side, and the other end passes through the inserted steel column and the vertical edge of the dispersion plate on the other side in sequence before extending into the end of the precast beam and connecting with the fixing head installed in the end of the precast beam.

[0017] Preferably, the end of the cable body connected to the dispersion plate is provided with two Y-shaped branches, and the two branches are respectively anchored to the positions of the dispersion plate near the upper and lower cladding steel; the cable bodies of the steel cable components corresponding to the precast beams on both sides are distributed vertically and horizontally.

[0018] Preferably, the fixing head consists of a first tube, a second tube, and a third tube arranged in a three-pronged pattern. The first and second tubes are perpendicular to each other, and the angle between the third tube and the first and second tubes is greater than 90°. The second tube is provided with a threaded post that is threaded to the second tube, and the lower end of the threaded post is provided with an adjusting hook that is rotatably engaged with the threaded post.

[0019] The cable passes through the first tube, goes around the adjusting hook, and is then fixed in the third tube at its rear end.

[0020] The precast beam has a wedge groove at the upper end and a matching clamping wedge in the wedge groove; the clamping wedge is sleeved on the mounting column in the wedge groove and locked by the wedge nut.

[0021] It also includes an L-shaped bend plate set above the clamping wedge block, one side of which is bolted to the precast beam, and the other side is locked to the upper column steel and the dispersion plate by column side bolts;

[0022] The wedge groove and the clamping wedge are respectively provided with a first pipe groove and a second pipe groove, and the first pipe groove and the second pipe groove on the wedge groove and the clamping wedge are respectively enclosed to each other to form a first cavity and a second cavity for inserting the first pipe body and the second pipe body; a third cavity for inserting the third pipe body is provided at the corner of the wedge groove.

[0023] Preferably, a trapezoidal protrusion is provided in the middle of the horizontal side of the dispersion plate, and a limiting groove is provided on the precast beam at the position opposite to the protrusion, and the protrusion is locked in the limiting groove.

[0024] Preferably, the prefabricated corbel is formed by bending and welding steel plates to form a square structure, and an X-shaped reinforcing plate is provided in the middle.

[0025] Preferably, a connecting plate is provided at the junction of the precast corbel and the bottom surface of the precast beam, and the connecting plate is locked to the precast beam and the precast corbel respectively by bottom bolts.

[0026] The beneficial effects of this invention are mainly reflected in the following aspects: by transferring the cantilever stress of the precast beam to the opposite side of the precast column via a force transmission mechanism and achieving stress diffusion through a dispersion plate, the stress at the joint is transformed from concentrated stress on one side to balanced stress across the entire cross section of the column from the perspective of the force mechanism. This significantly reduces stress concentration at the joint, improves the safety and durability of the joint, and simultaneously achieves fully prefabricated construction and reliable connection. Specifically:

[0027] 1. The stress distribution mode has been fundamentally optimized, and the nodal stress has been significantly reduced.

[0028] A force transmission mechanism is used to transfer the cantilever internal force of the precast beam to the opposite side of the precast column, and the stress is evenly diffused to the opposite side facade through a distribution plate. This transforms the column from a single-sided local bearing pressure to a whole-section overall shear stress, eliminating the stress concentration problem of traditional corbel joints from the root, reducing the shear force and bending moment in the connection area between the corbel root and the column, and improving the joint's crack resistance and damage resistance.

[0029] 2. Flexible and diverse force transmission methods, with strong adaptability and versatility.

[0030] Hard steel plates (U-shaped semi-enclosed) or steel cable components can be used as force transmission mechanisms. The U-shaped steel plates can achieve semi-enclosed overall force transmission, while the steel cables can achieve efficient tension-coupling force transmission. The structural form can be flexibly selected according to engineering needs and is suitable for cantilever node scenarios in different prefabricated buildings.

[0031] 3. The column body adopts segmented steel cladding and plug-in connection, which ensures high installation accuracy and good overall integrity.

[0032] The upper and lower columns are connected by upper and lower cladding steel, and intermediate interlocking steel columns. The interlocking positioning is secured by flange locking, resulting in high connection accuracy and fast construction speed. The cladding steel and the precast column form an integral force-bearing structure, significantly improving the stiffness of the column end and the constraint capacity of the joint area, thus improving seismic performance.

[0033] 4. The integrated locking mechanism of the dispersion plate ensures reliable force transmission and uniform force distribution.

[0034] The L-shaped dispersion plate is simultaneously locked to the steel sidewall of the column and the top surface of the precast corbel, forming a two-way constraint in both vertical and horizontal directions. It not only bears the tension transmitted by the steel cable / plate, but also restricts the displacement of the beam together with the corbel. The dispersion plate and the beam are engaged by trapezoidal protrusions and limiting grooves, which further improves the positioning accuracy and anti-slip capability.

[0035] 5. The steel cables are arranged in a double-branched, staggered pattern, which completely solves the problem of interference from symmetrical installation on both sides.

[0036] The steel cables are anchored in a Y-shape with double forks, resulting in more even stress distribution and more reliable anchoring. The steel cables on both sides are arranged with staggered perforations to avoid cross-collision of the steel cables inside the column when the cantilever is symmetrical, ensuring that the cantilever beams on both sides can be installed and tensioned smoothly.

[0037] 6. The steel cable anchoring is adjustable and self-locking upon tightening, making assembly convenient and connection reliable.

[0038] The precast beam ends adopt a three-pronged fixing head with an adjusting hook and a clamping wedge structure to achieve fine adjustment of the steel cable length and self-locking clamping; the clamping wedge and the turn plate double lock, which is firmly fixed and not easy to loosen. It can realize a fully dry assembly process of first hoisting the beam and then anchoring the steel cable, which greatly improves the construction efficiency.

[0039] 7. Simplified node construction enables the design goal of weak nodes and strong components.

[0040] Relying on the stress transfer across columns and the full-section force-bearing mechanism, the force requirements can be met without increasing the corbel cross section or excessively strengthening the reinforcement, making the node structure simpler and the prefabrication easier.

[0041] 8. The reinforced design of the brackets and connecting parts results in superior overall rigidity and durability.

[0042] The precast corbels are made of welded steel plates with internal X-shaped reinforcing plates, which have high rigidity and strong load-bearing capacity. The corbels are connected to the bottom of the beam with a bottom-locking plate to further improve the reliability of the support. The entire node is multi-directionally constrained and locked in multiple ways, so it is not easy to loosen, deform or leak after long-term use. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of a U-shaped steel plate in one embodiment;

[0045] Figure 3 for Figure 1 Enlarged view of section A in the middle;

[0046] Figure 4 This is a schematic diagram of the wedge groove and the clamping wedge.

[0047] Figure 5 This is a schematic diagram of the fixed head structure;

[0048] Figure 6 This is a schematic diagram of the dispersion plate structure;

[0049] Reference numerals: 1. Precast column, 2. Precast corbel, 3. Precast beam, 4. Dispersion plate, 5. U-shaped steel plate, 6. Cable body, 7. Fixing head, 8. Upper column, 9. Lower column, 10. Upper column cladding steel, 11. Lower column cladding steel, 12. Inserted steel column, 13. Flange, 14. Column end bolt, 15. Column side bolt, 16. Corbel bolt, 17. First pipe body, 18. Second pipe body, 19. Third pipe body, 20. Threaded column, 21. Adjusting hook, 22. Wedge groove, 23. Clamping wedge, 24. Mounting column, 25. Turning plate, 26. Protrusion, 27. Reinforcing plate, 28. Connecting plate, 29. Bottom support bolt, 30. First cavity, 31. Second cavity, 32. Third cavity. Detailed Implementation

[0050] The present invention will now be described in further detail with reference to the accompanying drawings. These specific embodiments are merely for explaining the invention and do not constitute an undue limitation on the scope of protection; any non-inventive modifications made by those skilled in the art based on the concept of the present invention should fall within the scope of protection of the present invention.

[0051] 1. Overall Node Composition and Installation Relationship

[0052] like Figure 1 As shown, a fully prefabricated beam-column joint based on cantilever corbels mainly consists of a precast column 1, a precast corbel 2, a precast beam 3, a distribution plate 4, and a force transmission mechanism. The precast corbel 2 is fixedly mounted on the side wall of the precast column 1, serving as the main vertical support component and providing stable support for the precast beam 3. The end of the precast beam 3 is directly supported on the precast corbel 2, forming a close fit to ensure rapid and accurate hoisting and positioning. One end of the force transmission mechanism is connected to the end of the precast beam 3, and the other end passes through the precast column 1 and is fixedly connected to the distribution plate 4 on the opposite side. This mechanism transmits and evenly distributes the tensile and bending moments generated by the precast beam 3 in the cantilever state to the opposite side of the precast column 1, transforming the traditional single-sided concentrated force distribution of the joint into a balanced force distribution across the entire cross-section of the column. This eliminates stress concentration from a mechanistic perspective, achieving the design goal of a weak joint and a strong component.

[0053] 2. Hardened steel plate force transmission mechanism

[0054] like Figure 2As shown, as one embodiment of the force transmission mechanism, this invention employs a rigid steel plate force transmission mechanism. The steel plate component is a U-shaped steel plate 5, which semi-encloses the outside of the precast column 1 without intruding into the concrete of the column body, thus preserving the integrity and structural strength of the precast column 1. One side of the U-shaped steel plate 5 extends vertically upwards or downwards, directly forming a distribution plate 4 that closely adheres to the opposite side of the precast column 1. The two are integrally formed structures, ensuring continuous force transmission without weak points. The other side of the U-shaped steel plate 5 is fixed to the end face of the precast beam 3 by bolts or welding, allowing the cantilever stress of the precast beam 3 to be directly transferred to the U-shaped steel plate 5, and then diffused to the opposite side of the precast column 1 via the distribution plate 4, achieving stress transfer across the column and full-section force bearing. This embodiment has high structural rigidity and strong integrity, making it suitable for cantilever structures with large loads and high requirements for node rigidity.

[0055] 3. Steel cable force transmission mechanism

[0056] As another preferred embodiment of the force transmission mechanism, this invention employs a steel cable force transmission mechanism, suitable for dry assembly and lightweight construction scenarios. The steel cable force transmission mechanism consists of a cable body 6 and a fixing head 7. The cable body 6 is made of high-strength prestressed steel cable, characterized by high tensile strength, small deformation, and good durability. One end of the cable body 6 is anchored to the distribution plate 4, and the other end passes horizontally through the reserved hole in the precast column 1, extending into the interior of the end of the precast beam 3, and is reliably anchored through the fixing head 7. During hoisting construction, the precast beam 3 can be placed stably on the precast bracket 2 first, and then the cable body 6 and the fixing head 7 can be anchored together, realizing a full assembly process of "hoisting first, then anchoring", which greatly improves on-site construction efficiency.

[0057] 4. Precast column segmented connection structure

[0058] like Figure 1 , Figure 3 As shown, to further improve the efficiency of prefabricated installation and the strength of column end connections, the prefabricated column 1 adopts a segmented structure, including an upper column 8 and a lower column 9. The lower end of the upper column 8 is externally covered by an upper column-encasing steel 10, which is fixed to the upper column 8 as a whole by grouting or embedded parts; the upper end of the lower column 9 is externally covered by a lower column-encasing steel 11, which is also fixed to the lower column 9 as a whole. The prefabricated bracket 2 is made of bent and welded steel plate and is directly fixed to the side wall of the lower column-encasing steel 11, so that the prefabricated bracket 2 and the lower column-encasing steel 11 form a rigid integrated structure, which is directly subjected to force and reliably transmitted.

[0059] An insertable steel column 12 is installed between the upper cladding steel column 10 and the lower cladding steel column 11. Both the upper and lower cladding steel columns 10 and 11 have recessed insertion grooves on their opposite end faces, the dimensions of which match the insertable steel column 12 for rapid positioning and alignment. Two flanges 13 are fixedly installed on the circumference of the insertable steel column 12, respectively abutting against the end faces of the upper and lower cladding steel columns 10 and 11, and are evenly tightened by column end bolts 14. This ensures that the upper column 8, lower column 9, insertable steel column 12, upper cladding steel column 10, and lower cladding steel column 11 form a complete load-bearing structure, significantly improving column end stiffness and seismic performance.

[0060] The dispersion plate 4 is an L-shaped steel plate component, such as... Figure 6 As shown. The vertical edge of the dispersion plate 4 is tightly abutted against the side wall of the upper column steel 10 and locked in place by the column side bolts 15; the horizontal edge of the dispersion plate 4 is laid horizontally on the top surface of the precast corbel 2 on the same side and locked in place with the precast corbel 2 by the corbel bolts 16, so that the dispersion plate 4 is simultaneously constrained by both vertical and horizontal forces, ensuring stable force distribution without loosening or slippage. One end of the cable body 6 is anchored to the vertical edge of one side of the dispersion plate 4, and the other end passes through the reserved hole of the insertion steel column 12 and the reserved hole of the vertical edge of the other side of the dispersion plate 4 in sequence, extends into the end of the precast beam 3 and connects with the fixing head 7, forming a complete tension force transmission path.

[0061] 5. Cable branching anchorage and staggered anti-interference arrangement

[0062] To further optimize the stress distribution and resolve the interference problem of symmetrical cantilever, a Y-shaped double-forked configuration is installed at the end where the cable 6 connects to the distribution plate 4. The two forks are anchored to the distribution plate 4 near the upper and lower cladding steel 10 and 11 respectively, ensuring that the tension is evenly distributed vertically and avoiding stress concentration at single anchor points. When precast beams 3 are symmetrically installed on both sides of the precast column 1, the corresponding cables 6 on both sides are arranged in a staggered manner, meaning that the perforation heights of the cables 6 on both sides within the precast column 1 are different, preventing them from crossing or colliding with each other. This ensures that both sides of the precast beams 3 can be successfully hoisted and that the cables 6 can be successfully threaded and tensioned, completely resolving the interference problem of symmetrical installation.

[0063] 6. Trident fixing head and adjusting anchoring structure

[0064] like Figure 5 As shown, the fixing head 7 has a three-pronged structure, including a first tube 17, a second tube 18, and a third tube 19. The first tube 17 and the second tube 18 are arranged perpendicular to each other, and the angle between the third tube 19 and the first tube 17 and the second tube 18 is greater than 90°, forming a stable triangular anchoring shape. The second tube 18 has internal threads, forming a threaded engagement with the threaded post 20; the lower end of the threaded post 20 is provided with a freely rotatable adjusting hook 21, and there is no circumferential jamming between the adjusting hook 21 and the threaded post 20.

[0065] The cable 6 passes through the first tube 17 into the fixed head 7, and after passing around the adjusting hook 21, its end is fixed in the third tube 19. During on-site installation, the adjusting hook 21 can be moved up and down by rotating the threaded column 20, so as to achieve precise fine adjustment of the tension length of the cable 6, ensuring that the tension is in place, the force is even, and eliminating the risk of slack.

[0066] like Figure 4 As shown, a wedge groove 22 is provided at the upper end of the precast beam 3, and a clamping wedge 23 with a matching shape is installed in the wedge groove 22. The clamping wedge 23 is sleeved on the mounting column 24 in the wedge groove 22 and locked in place by a nut to achieve self-locking clamping. An L-shaped turn plate 25 is provided above the clamping wedge 23. One side of the turn plate 25 is bolted to the precast beam 3, and the other side is locked to the upper column steel 10 and the dispersion plate 4 by sharing the column side bolt 15, forming multiple constraints and improving the overall integrity of the node.

[0067] The wedge groove 22 and the clamping wedge 23 are respectively provided with arc-shaped tube grooves, which enclose each other to form the first tube 30 and the second tube 31, which are used to accommodate the first tube 17 and the second tube 18 respectively; the corner of the wedge groove 22 is provided with a third tube 32, which is used to insert and fix the third tube 19, so that the fixing head 7 is completely positioned, does not shake or shift, and is reliably anchored.

[0068] This invention employs a three-pronged distributed fixing head 7 structure. Through the spatial angle arrangement of the first tube 17, the second tube 18, and the third tube 19, a stable three-dimensional anchoring form is formed, enabling efficient turning, tensioning, and fixing of the cable 6 within a limited space. The second tube 18 is equipped with a threaded post 20 and a rotatable adjusting hook 21, allowing for precise micro-adjustments of the cable 6 length on-site, ensuring the cable 6 is always under proper tension and effectively eliminating potential problems such as slackness and uneven stress. The third tube 19 is inclined at an angle greater than 90° to both the first tube 17 and the second tube 18. The arrangement can form an oblique constraint and lock on the end of the cable body 6, which can not only ensure the smooth turning of the cable body 6 and reduce bending damage, but also generate a self-locking effect when under tension, further preventing the cable body 6 from slipping and failing; the overall structure of the fixing head 7, together with the wedge groove 22, the clamping wedge 23 and the crank plate 25, can completely constrain and position the fixing head 7, avoiding rotation, movement or loosening during the stress process, significantly improving the anchoring reliability, structural safety and durability, and is particularly suitable for fully prefabricated dry construction, which can achieve rapid installation and reliable locking without welding or complicated on-site operations.

[0069] 7. Trapezoidal protrusion limiting and positioning structure

[0070] like Figure 6As shown, a trapezoidal protrusion 26 is provided in the middle of the horizontal side of the dispersion plate 4, and a matching limiting groove is opened at the corresponding position of the precast beam 3 and the trapezoidal protrusion 26. When the precast beam 3 is hoisted into place, the trapezoidal protrusion 26 directly engages in the limiting groove, realizing the rapid and accurate positioning of the precast beam 3, restricting horizontal slippage and torsion, reducing the difficulty of installation and positioning, and improving the assembly accuracy of nodes and the stability of long-term use.

[0071] 8. Precast corbel reinforcement and bottom connection structure

[0072] The precast corbel 2 is a closed square box structure formed by bending and welding steel plates, which has high rigidity, uniform stress distribution, and is not easily deformed. X-shaped reinforcing plates 27 are installed inside the corbel and are welded to the inner walls of the corbel to further improve the shear, bending and compressive bearing capacity, meeting the requirements for cantilever use under large loads.

[0073] A connecting plate 28 is installed at the bottom joint of the precast corbel 2 and the precast beam 3. The connecting plate 28 is locked and fixed to the bottom surface of the precast beam 3 and the bottom surface of the precast corbel 2 respectively by the bottom support bolts 29, forming a bottom support constraint to prevent the precast beam 3 from going out, warping, or displacing after long-term use, and further improving the safety redundancy and durability of the node.

[0074] 9. Overall construction and installation process

[0075] This invention employs a fully dry prefabricated construction method, with the following steps:

[0076] 1. Complete the pre-installation and fixing of the upper column 8, lower column 9, plug-in steel column 12, column cladding steel and prefabricated bracket 2 of the prefabricated column 1;

[0077] 2. Fix the dispersion plate 4 to the column-wrapping steel and the precast bracket 2 on both sides of the precast column 1 respectively;

[0078] 3. Pass the cable body 6 through the plug-in steel column 12 beforehand, and anchor one end to the dispersion plate 4;

[0079] 4. Hoist the precast beam 3 and place it smoothly on the precast corbel 2, while simultaneously engaging the trapezoidal protrusion 26 into the limiting groove;

[0080] 5. Connect the free end of the cable body 6 to the fixing head 7, insert it into the wedge slot 22, and complete the adjustment and locking;

[0081] 6. Install the clamping wedge block 23 and the crank plate 25 to complete the assembly.

[0082] The entire process involves no on-site wet work or extensive welding, and the installation is quick, with clear stress distribution and controllable quality.

[0083] 10. Working Principle and Technical Advantages

[0084] Under vertical loads, the precast beam 3 generates a cantilever overturning moment. Traditional corbels can only resist this by localized stress on one side, which easily leads to stress concentration and cracking. This invention directly transfers the tensile force to the distribution plate 4 on the opposite side of the precast column 1 through a force transmission mechanism, allowing the stress to be evenly diffused across the entire column side. This enables the precast column 1 to participate in the load-bearing process with its entire cross-section, transforming localized stress concentration into uniform overall stress, fundamentally solving the problem of stress concentration at the joint. Simultaneously, the fully prefabricated structure simplifies the joints and reduces prefabrication difficulty, making it suitable for various prefabricated frame cantilever beam-column joint projects.

Claims

1. A fully prefabricated building beam-column joint based on corbel cantilever, comprising a prefabricated column (1), a prefabricated corbel (2) and a prefabricated beam (3); the prefabricated corbel (2) is disposed on the side wall of the prefabricated column (1); the end of the prefabricated beam (3) is supported on the prefabricated corbel (2) and the prefabricated corbel (2) forms end support for the prefabricated beam (3); Its features are: It also includes a force transmission mechanism, one end of which is connected to the end of the precast beam (3), and the other end passes through the precast column (1) and is connected to a dispersion plate (4) set on the opposite side of the precast column (1) so as to disperse the cantilever stress from the precast beam (3) to the opposite side facade of the precast column (1) through the dispersion plate (4).

2. The prefabricated building beam-column joint based on corbel cantilever as described in claim 1, characterized in that: The force transmission mechanism is a rigid steel plate force transmission mechanism, which connects the end of the precast beam (3) and the dispersion plate (4) on the opposite side of the precast column (1) through a steel plate component that bypasses the precast column (1).

3. The prefabricated building beam-column joint based on corbel cantilever as described in claim 2, characterized in that: The steel plate component is a U-shaped steel plate (5) that is semi-enclosed and covers the precast column (1); one side of the U-shaped steel plate (5) extends upward / downward to form a dispersion plate (4) that contacts the opposite side of the precast column (1), and the other side is connected to the end face of the precast beam (3).

4. The prefabricated building beam-column joint based on corbel cantilever as described in claim 1, characterized in that: The force transmission mechanism is a steel cable force transmission mechanism, which connects the end of the precast beam (3) and the dispersion plate (4) on the opposite side of the precast column (1) through a steel cable component passing through the precast column (1).

5. The prefabricated building beam-column joint based on corbel cantilever as described in claim 4, characterized in that: The steel cable component includes a cable body (6) and a fixing head (7). One end of the cable body (6) is anchored on the distribution plate (4), and the other end passes through the precast column (1) and is installed in the end of the precast beam (3) through the fixing head (7).

6. The prefabricated building beam-column joint based on corbel cantilever as described in claim 5, characterized in that: The precast column (1) includes an upper column (8) and a lower column (9). The lower end of the upper column (8) is covered with an upper column steel (10) that is fixedly connected to the upper column (8), and the upper end of the lower column (9) is covered with a lower column steel (11) that is fixedly connected to the lower column (9). The precast bracket (2) is formed by steel plates arranged on the side wall of the lower column steel (11), and the precast bracket (2) and the lower column steel (11) form an integral structure. An insertable steel column (12) is provided between the upper cladding steel column (10) and the lower cladding steel column (11). The upper cladding steel column (10) and the lower cladding steel column (11) have concave insertion grooves that match the insertable steel column (12) on their opposite end faces. Two flanges (13) are provided on the circumference of the insertable steel column (12). The two ends of the insertable steel column (12) are inserted into the insertion grooves. The two flanges (13) on the insertable steel column (12) are respectively attached to the end faces of the upper cladding steel column (10) and the lower cladding steel column (11) and are locked by column end bolts (14). The dispersion plate (4) is L-shaped. The vertical side of the dispersion plate (4) is attached to the side wall of the upper column steel (10) and locked to the upper column steel (10) by the column side bolt (15). The horizontal side of the dispersion plate (4) is set on the top surface of the prefabricated bracket (2) on the same side and locked to the prefabricated bracket (2) by the bracket bolt (16). One end of the cable body (6) of the steel cable component is anchored to the vertical side of the dispersion plate (4) on one side, and the other end passes through the inserted steel column (12) and the vertical side of the dispersion plate (4) on the other side in sequence before extending into the end of the precast beam (3) and connecting with the fixing head (7) installed in the end of the precast beam (3).

7. The prefabricated building beam-column joint based on corbel cantilever as described in claim 6, characterized in that: The cable body (6) is connected to the dispersing plate (4) at one end with two Y-shaped branches, and the two branches are anchored to the positions of the dispersing plate (4) near the upper and lower cladding steel (10) and the lower cladding steel (11), respectively; the cable bodies (6) of the steel cable components corresponding to the precast beams (3) on both sides are staggered vertically.

8. The prefabricated building beam-column joint based on corbel cantilever as described in claim 7, characterized in that: The fixing head (7) consists of a first tube (17), a second tube (18), and a third tube (19) arranged in a three-pronged pattern. The first tube (17) and the second tube (18) are perpendicular to each other, and the angle between the third tube (19) and the first tube (17) and the second tube (18) is greater than 90°. The second tube (18) is provided with a threaded post (20) that is threaded to the second tube (18). The lower end of the threaded post (20) is provided with an adjusting hook (21) that is rotatably engaged with the threaded post (20). The cable (6) passes through the first tube (17), goes around the adjusting hook (21), and is then fixed in the third tube (19). The precast beam (3) has a wedge groove (22) at the upper end and a matching clamping wedge (23) in the wedge groove (22); the clamping wedge (23) is sleeved on the mounting column (24) in the wedge groove (22) and locked by the wedge nut; It also includes an L-shaped bend plate (25) set above the clamping wedge (23), one side of which is bolted to the precast beam (3), and the other side is locked to the upper column steel (10) and the dispersion plate (4) by column side bolts (15); The wedge groove (22) and the clamping wedge (23) are respectively provided with a first tube groove and a second tube groove, and the first tube groove and the second tube groove on the wedge groove (22) and the clamping wedge (23) respectively enclose each other to form a first tube cavity (30) and a second tube cavity (31) for the first tube body (17) and the second tube body (18) to be inserted; the corner of the wedge groove (22) is provided with a third tube cavity (32) for the third tube body (19) to be inserted.

9. The prefabricated building beam-column joint based on corbel cantilever as described in claim 8, characterized in that: The dispersion plate (4) has a trapezoidal protrusion (26) in the middle of its horizontal side. The precast beam (3) has a limiting groove at the position opposite to the protrusion (26), and the protrusion (26) is locked in the limiting groove.

10. The prefabricated building beam-column joint based on corbel cantilever as described in claim 9, characterized in that: The prefabricated corbel (2) is a square structure formed by bending and welding steel plates, and an X-shaped reinforcing plate (27) is provided in the middle.

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