An embedded structure for unloading pull rings at the connection node between cast-in-place beams and cantilever slabs

Abstract

This invention proposes a pre-embedded unloading pull ring structure at the connection node between a cast-in-place beam and a cantilever slab. The structure includes a beam body, with a cantilever slab body extending from the bottom of the beam body. A pull ring body is located at the bottom of the beam body, with one end embedded within the beam body and the other end protruding from the connection node between the beam body and the cantilever slab body. By pre-embedding the pull ring body at the bottom of the beam body and having one end protrude from the connection node, this invention eliminates the need for pre-drilling openings in the cantilever slab body. This ensures that the subsequently connected steel wire rope is in a straight line, optimizing the stress distribution between the steel wire rope and the structural beam, reducing the risk of structural damage. Simultaneously, it avoids conflicts, wear, and pressure damage to the cantilever slab caused by inaccurate opening locations, eliminates the risk of leakage due to openings, improves the safety, durability, and waterproofing performance of the cantilever slab, simplifies construction steps, and increases construction efficiency.

Description

[Technical Field]

[0002] This utility model relates to the field of building safety construction technology, and in particular to a pre-embedded structure for unloading pull rings at the connection node between cast-in-place beams and cantilever slabs. [Background Technology]

[0004] In the construction process, scaffolding, as an important construction facility, is crucial for safety and stability. To improve the load-bearing capacity and stability of scaffolding, the pre-embedding of unloading rings has become a key technical measure, widely used in the construction of cast-in-place structural beams. In typical cast-in-place structural beam scenarios, unloading rings are usually pre-embedded in appropriate locations within the beam. Working in conjunction with subsequently connected unloading devices (such as wire ropes), they transfer part of the load borne by the scaffolding to the beam, effectively reducing the burden on the scaffolding itself and ensuring its safety during construction.

[0005] However, the situation becomes more complex when cast-in-place structural beams are connected to cantilever slabs. At this particular joint, the traditional approach is to pre-embed tie rings in the upper part of the beam and reserve openings for steel wire ropes in the cantilever slab to connect the scaffolding to the building structure, thereby improving the stability of the scaffolding. However, this method has revealed a series of problems in practical application. First, the positional accuracy of the openings in the cantilever slab is difficult to control precisely on the construction site. Due to various factors such as formwork installation deviations, measurement errors, and non-standard worker operations during construction, the opening position is prone to deviation. Once the opening position is inaccurate, the steel wire rope will collide with the cantilever slab when it passes through the opening and connects. Prolonged friction between the steel wire rope and the edge of the opening will cause wear and tear on the steel wire rope, gradually damaging the internal wires, significantly reducing its load-bearing capacity, and potentially causing it to break at any time, posing a serious safety threat to the construction workers on the scaffolding. Secondly, deviations in the location of openings can cause abnormal pressure on the local structure of the cantilever slab, leading to concrete cracking, steel reinforcement deformation, and damage to the structural integrity of the cantilever slab, endangering the safety of the entire building structure and consequently affecting the stability of the scaffolding. Furthermore, pre-reserved openings disrupt the structural integrity of the cantilever slab, impacting the building's waterproofing performance. During the building's use after scaffolding removal, rainwater and domestic wastewater can easily seep in through these openings, causing steel reinforcement corrosion, damaging the concrete structure, weakening its load-bearing capacity, and shortening the building's lifespan. Moreover, traditional construction methods are complex, requiring pre-embedding and pre-reservation operations in the upper beam and cantilever slab separately. When pre-embedding tie rings in the upper beam, precise positioning and secure fixing are necessary to ensure the tie rings can withstand the load; when pre-reserving openings in the cantilever slab, the size and location of the openings must meet requirements, demanding a high level of technical skill from the construction workers. These complex procedures increase construction difficulty, extend construction time, and consequently prolong the overall construction cycle. The subsequent sealing and waterproofing of the pre-reserved openings also increase material and labor costs. [Utility Model Content]

[0007] The purpose of this utility model is to provide a pre-embedded unloading pull ring structure at the connection node between cast-in-place beams and cantilever slabs, aiming to solve at least one of the above-mentioned problems in the prior art.

[0008] This utility model is achieved through the following technical solution:

[0009] An unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab includes a beam body, a cantilever slab body extending from the bottom of the beam body, a pull ring body at the bottom of the beam body, one end of the pull ring body being located within the beam body, and the other end passing through the connection node between the beam body and the cantilever slab body.

[0010] As described above, a pre-embedded unloading pull ring structure at the connection node between a cast-in-place beam and a cantilever slab includes a beam body comprising first side templates on both sides and a bottom template at the bottom. The bottom template also serves as the forming support foundation for the cantilever slab body. A second side template is provided at one end of the cantilever slab body, and the second side template is connected to the side end of the bottom template. Beam reinforcement is provided between the two first side templates. Cantilever slab reinforcement is provided on the bottom template and connected to the bottom of the beam reinforcement. The bottom template has an opening. A section of the pull ring body is connected to the beam reinforcement, and one end passes through the opening.

[0011] As described above, the unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab includes main bars at the upper and lower ends of the beam reinforcement, a web bar between the main bars, stirrups around the main bars and the web bar, the lower part of the stirrups being connected to the cantilever slab reinforcement, a section of the pull ring body being fixedly connected to the web bar and the main bar at the lower end, and one end passing through an opening on the bottom formwork.

[0012] As described above, a pre-embedded unloading pull ring structure at the connection node between a cast-in-place beam and a cantilever slab includes two pre-embedded sections, with an exposed section connecting the two pre-embedded sections for connection with other components. Each pre-embedded section includes a starting section, which extends to and is connected to a transition section. The transition section extends to and is connected to the exposed section. A first turning node is provided at the connection between the starting section and the transition section, and the first turning node is fixedly connected to the reinforcing bar.

[0013] As described above, in the pre-embedded unloading pull ring structure at the connection node between the cast-in-place beam and the cantilever slab, a second turning node is provided at the junction of the transition section and the exposed section, and the second turning node is fixedly connected to the main reinforcement located at the lower end.

[0014] According to the claim, the unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab has an exposed section that is U-shaped.

[0015] As described above, the unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab is made of round steel with a diameter of 18-22mm, and the size of the opening is adapted to the pull ring body.

[0016] As described above, in the pre-embedded unloading pull ring structure at the connection node between a cast-in-place beam and a cantilever slab, the length L1 of the starting section is 80-120mm, the distance L2 from the bottom of the exposed section to the transition section is 80-120mm, and the length L3 of the transition section is 320-360mm.

[0017] As described above, the unloading pull ring pre-embedded structure at the connection node between the cast-in-place beam and the cantilever slab has two pre-embedded sections that are parallel to each other and the distance H between them is 80-100mm.

[0018] As described above, in the pre-embedded structure of unloading pull ring at the connection node between cast-in-place beam and cantilever slab, the lower end of the pull ring body is connected to an unloading cable, and the downward end of the unloading cable is connected to scaffolding.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] This application introduces a pull ring body at the bottom of the connection node between the beam body and the cantilever slab body. One end of the pull ring body is embedded in the beam body, and the other end protrudes from the connection node. This pre-embedded structure of the unloading pull ring avoids reserving holes for steel wire ropes in the cantilever slab, preventing wear and breakage of the steel wire ropes due to hole position deviation, thus improving safety. Simultaneously, this method avoids abnormal pressure on the local structure of the cantilever slab due to hole position deviation, preventing concrete cracking and steel reinforcement deformation, ensuring the integrity of the cantilever slab and the entire building structure, and facilitating stable support for scaffolding. Furthermore, by eliminating the need for reserving holes in the cantilever slab, the structural integrity of the cantilever slab is maintained, preventing rainwater and domestic water from seeping in through the holes, preventing steel reinforcement corrosion and concrete structural damage, enhancing the building's waterproofing performance, and extending the building's service life. Moreover, since the ring body only needs to be pre-embedded at the bottom of the beam, there is no need to pre-embed and reserve it separately at the top of the beam and the cantilever slab. This simplifies the construction process, reduces the technical requirements for construction personnel, shortens the construction time, and reduces the overall construction cycle. At the same time, there is no need to do opening sealing, waterproofing and other work in the later stage, which reduces material and labor costs. [Attached Image Description]

[0022] To more clearly illustrate the technical solutions in the embodiments of the utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0023] Figure 1 This is a connection diagram illustrating the application of this embodiment in scaffolding reinforcement.

[0024] Figure 2 for Figure 1 Enlarged schematic diagram of the unloading pull ring pre-embedded structure proposed in this embodiment;

[0025] Figure 3 This is a front view of the pull ring body in this embodiment;

[0026] Figure 4 This is a side view of the pull ring body in this embodiment.

Detailed Implementation Methods

[0028] To make the technical problems solved by this application, the technical solutions, and the beneficial effects clearer, this application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0029] In the construction of the connection between cast-in-place structural beams and cantilever slabs, the traditional approach is to pre-embed tie rings in the upper part of the beam and reserve openings in the cantilever slab for threading steel wire ropes. However, this approach has some problems, such as inaccurate opening positions that may cause the steel wire ropes to collide with the cantilever slab, resulting in wear of the steel wire ropes and structural damage to the cantilever slab; at the same time, the reserved openings may also bring the risk of leakage.

[0030] To resolve the above issues, please refer to Figures 1 to 4 This embodiment provides a pre-embedded unloading pull ring structure at the connection node between a cast-in-place beam and a cantilever slab, including a beam body 1, a cantilever slab body 2 extending from the bottom of the beam body 1, a pull ring body 3 at the bottom of the beam body 1, one end of the pull ring body 3 being located inside the beam body 1, and the other end passing through the connection node between the beam body 1 and the cantilever slab body 2.

[0031] In this embodiment, the pre-embedding process of the pull ring body 3 is relatively simple and its location is clearly defined, eliminating the need for additional openings in the cantilever slab body 2. This simplifies the construction steps and improves construction efficiency. The pull ring body 3 is pre-embedded at the bottom of the beam body 1, ensuring that the subsequently connected wire ropes are in a straight line. This optimizes the stress distribution between the wire ropes and the structural beam, reducing the risk of structural damage due to uneven stress. Furthermore, compared to the traditional method of pre-embedding the pull ring at the top of the beam and reserving openings for the wire ropes in the cantilever slab, the pull ring body 3 of this invention passes through the connection node between the beam body 1 and the cantilever slab body 2, eliminating the need for openings in the cantilever slab. This completely avoids conflicts between the wire ropes and the cantilever slab caused by inaccurate opening locations. It also prevents wear and tear on the wire ropes due to friction with the edge of the opening, thus avoiding potential safety hazards caused by wire rope wear. Additionally, it prevents localized structural damage to the cantilever slab caused by pre-reserved openings, significantly improving the safety and durability of the cantilever slab structure during use. Moreover, since the reserved openings on the cantilever slab body 2 are eliminated in this structure, the integrity of the cantilever slab structure is maintained, and the risk of leakage caused by the existence of openings is eliminated from the root, so that the waterproof performance of the building is effectively guaranteed, and the cost and trouble of subsequent repairs due to leakage problems are reduced.

[0032] Furthermore, as a preferred embodiment of this solution and not a limitation, the beam body 1 includes first side templates 11 located on both sides and a bottom template 12 located at the bottom. The bottom template 12 also serves as the forming support foundation for the cantilever slab body 2. A second side template 21 is provided at one end of the cantilever slab body 2. The second side template 21 is connected to the side end of the bottom template 12. Beam reinforcement 13 is provided between the two first side templates 11. Cantilever slab reinforcement 22 is provided on the bottom template 12 and connected to the bottom of the beam reinforcement 13. The bottom template 12 is provided with an opening 121. A section of the pull ring body 3 is connected to the beam reinforcement 13, and one end passes through the opening 121.

[0033] In this embodiment, the beam body 1 is formed by two first side templates 11 and one bottom template 12. The bottom template 12 serves not only as the bottom support of the beam body 1 but also as the forming support foundation for the cantilever slab body 2. A second side template 21 is provided on one side of the cantilever slab body 2, which is closely connected to the side of the bottom template 12, together forming the forming space of the cantilever slab body 2. Between the two first side templates 11, beam reinforcement 13 is provided to enhance the structural strength of the beam body 1. At the same time, cantilever slab reinforcement 22 connected to the bottom of the beam reinforcement 13 is provided on the bottom template 12 to ensure a firm connection between the cantilever slab body 2 and the beam body 1.

[0034] To embed the pull ring body 3, a hole 121 is specially provided on the bottom formwork 12. A section of the pull ring body 3 is reliably connected to the beam reinforcement 13, such as by welding or binding, to ensure its stability and load-bearing performance. Then, one end of the pull ring body 3 passes through the hole 121 on the bottom formwork 12 to facilitate the subsequent connection of unloading devices such as wire ropes. This provides precise position guidance for the pre-embedding of the pull ring body 3, avoiding construction errors caused by inaccurate positioning. Through the connection between the pull ring body 3 and the beam reinforcement 13, and by the bottom formwork 12 serving as the forming support foundation for the cantilever slab body 2, the stability and load-bearing performance of the overall structure are enhanced.

[0035] Furthermore, as a preferred embodiment of this solution and not a limitation, the beam reinforcement 13 includes main reinforcement 131 located at the upper and lower ends, a web reinforcement 132 is provided between the main reinforcement 131, and stirrups 133 are provided around the main reinforcement 131 and the web reinforcement 132. The lower part of the stirrups 133 is connected to the cantilever slab reinforcement 22. A section of the pull ring body 3 is fixedly connected to the web reinforcement 132 and the main reinforcement 131 located at the lower end, and one end passes through the opening 121 on the bottom formwork 12.

[0036] In this embodiment, the beam reinforcement 13 mainly consists of main reinforcement bars 131 located at the upper and lower ends, which are responsible for bearing the main load of the beam body 1. Between the main reinforcement bars 131, web reinforcement bars 132 are provided to increase the beam's shear strength and overall integrity. To firmly bind the main reinforcement bars 131 and web reinforcement bars 132 together and form a continuous reinforcement cage around the beam, stirrups 133 are provided. These stirrups 133 surround the main reinforcement bars 131 and web reinforcement bars 132 and are connected to them by binding or welding.

[0037] Specifically, the lower part of the stirrup 133 is connected to the cantilever slab reinforcement 22, which ensures a firm connection and overall stress distribution between the cantilever slab body 2 and the beam body 1.

[0038] To embed the pull ring body 3, a section of it is fixedly connected to the web reinforcement 132 and the main reinforcement 131 at the lower end. This connection method can be achieved by welding, binding or other reliable connection methods to ensure that the pull ring body 3 can stably transfer the load to the beam reinforcement 13 when under stress, avoiding safety hazards caused by weak connection.

[0039] Furthermore, as a preferred embodiment of this solution and not a limitation, the pull ring body 3 includes two pre-embedded sections 31, and an exposed section 32 for connecting with other components is connected between the two pre-embedded sections 31. The pre-embedded section 31 includes a starting section 311, the starting section 311 extends and is connected to a transition section 312, the transition section 312 extends and is connected to the exposed section 32, and a first turning node 313 is provided at the connection between the starting section 311 and the transition section 312, and the first turning node 313 is fixedly connected to the waist reinforcement 132.

[0040] In this embodiment, the pull ring body 3 consists of two embedded sections 31 and one exposed section 32. The two embedded sections 31 are embedded in the concrete of the beam body 1, while the exposed section 32 is located outside the beam body 1 and is used to connect with other components such as wire ropes.

[0041] Each embedded section 31 includes a starting section 311, a transition section 312, and an exposed section 32 connected to the transition section 312. The starting section 311 is the initial part of the embedded section 31 embedded into the beam body 1, and its shape and size match the openings 121 on the beam reinforcement 13 and the bottom formwork 12. The transition section 312 serves to connect the starting section 311 and the exposed section 32, and allows the pull ring body 3 to make necessary turns inside the beam body 1.

[0042] At the junction of the initial segment 311 and the transition segment 312, a first turning node 313 is provided. The bending angle at the first turning node 313 should preferably be 135°. This bending angle facilitates subsequent fixed connection with the waist reinforcement 132 and ensures smooth force transmission of the pull ring body 3 under stress. Through welding, binding, or other reliable connection methods, the first turning node 313 is firmly connected to the waist reinforcement 132, thereby ensuring the stability and reliability of the pull ring body 3 under stress.

[0043] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, a second turning node 314 is provided at the junction of the transition section 312 and the exposed section 32, and the second turning node 314 is fixedly connected to the main reinforcing bar 131 located at the lower end.

[0044] In this embodiment, a second turning node 314 is provided at the junction of the transition section 312 and the exposed section 32. The bending angle at the second turning node 314 is also preferably 135°. It is then tied or welded to the main reinforcement 131 located at the lower end, which further strengthens the anchorage of the pull ring body 3 within the beam. Combined with the fixed connection of the first turning node 313 mentioned above, this multi-node, multi-method connection makes the overall integrity of the pull ring body 3 and the beam reinforcement 13 stronger. It can more efficiently distribute the load transmitted from the cantilever slab to the overall stress system of the beam through the pull ring body 3, optimize the force transmission path, and avoid problems such as local stress concentration or anchorage failure when the pull ring body 3 is under stress due to insufficient anchorage. This improves the stability and reliability of the pull ring body 3 throughout the entire structural stress process.

[0045] Furthermore, as a preferred embodiment of this solution and not a limitation, the exposed section 32 is U-shaped. The exposed section 32 serves as the part connecting the pull ring body 3 to external components such as wire ropes or buckles, and its shape design is crucial for the ease and stability of the connection. In this embodiment, the exposed section 32 adopts a U-shaped design. This shape not only facilitates connection to external components, such as through hooks or buckles, but also provides a certain degree of strength and stability, ensuring the safety and reliability of the connection.

[0046] The design of the U-shaped exposed section 32 also takes into account ease of construction and cost-effectiveness. Because the U-shaped structure is relatively simple and easy to manufacture, manufacturing costs can be reduced. At the same time, the construction of the U-shaped exposed section 32 is also relatively simple, requiring no complex installation steps or tools, which helps to improve overall construction efficiency.

[0047] Furthermore, as a preferred embodiment of this solution and not a limitation, the material of the pull ring body 3 is round steel with a diameter of 18-22mm, and the size of the opening 121 is adapted to the pull ring body 3.

[0048] In this embodiment, the choice of material for the pull ring body 3, as a key component for bearing and transmitting loads, is crucial. In this embodiment, the pull ring body 3 is made of round steel with a diameter of 18-22 mm. This diameter range ensures that the pull ring body 3 has sufficient strength and rigidity to withstand the expected load, while maintaining appropriate flexibility to adapt to various deformations and stress changes during construction. Preferably, the diameter of the pull ring body 3 is 20 mm, because at this diameter, the optimal balance between performance and cost is achieved.

[0049] Meanwhile, to ensure that the pull ring body 3 can be smoothly embedded into the beam body 1, an opening 121 adapted to the size of the pull ring body 3 needs to be made on the bottom formwork 12. The size of the opening 121 should be slightly larger than the diameter of the pull ring body 3 to ensure that the pull ring body 3 can easily pass through the opening 121 and be embedded into the beam body 1. At the same time, the size of the opening 121 should not be too large to avoid problems such as concrete leakage or loosening of the pull ring body 3 during construction.

[0050] Furthermore, as a preferred embodiment of this solution and not a limitation, the length L1 of the starting segment 311 is 80-120mm, the distance L2 from the bottom of the exposed segment 32 to the transition segment is 80-120mm, and the length L3 of the transition segment 312 is 320-360mm.

[0051] In this embodiment, the starting segment 311 serves as the connection between the pull ring body 3 and the beam reinforcement 13, and its length is crucial to the stability and reliability of the connection. In this embodiment, the length L1 of the starting segment 311 is set to 80-120mm. This length range ensures that the connection between the starting segment 311 and the beam reinforcement 13 is sufficiently strong without causing excessive material waste. Preferably, the length L1 of the starting segment 311 is 100mm, at which the stability and reliability of the connection are best guaranteed.

[0052] As the part that connects to the external component, the distance L2 between the bottom of the exposed section 32 and the transition section also needs to be designed reasonably. In this embodiment, the distance L2 between the bottom of the exposed section 32 and the transition section is set to 80-120mm. This length range ensures that the connection between the exposed section 32 and the external component is convenient and stable enough. Similarly, preferably, the distance L2 between the bottom of the exposed section 32 and the transition section is 100mm to achieve the best balance between connection convenience and material cost.

[0053] The transition section 312, acting as a bridge connecting the starting section 311 and the exposed section 32, has a significant impact on the stress performance and stability of the entire pull ring body 3. In this embodiment, the length L3 of the transition section 312 is set to 320-360 mm. This length range ensures that the transition section 312 can effectively transfer loads during stress while maintaining structural stability. Preferably, the length L3 of the transition section 312 is 350 mm, at which the stress performance and stability of the pull ring body 3 are optimal.

[0054] Furthermore, as a preferred embodiment of this solution, and not a limitation thereof, the two embedded sections 31 are parallel to each other, and the distance H between them is 80-100mm. As the key components connecting the pull ring body 3 and the beam body 1, the parallelism and spacing of the two embedded sections 31 have a significant impact on the stability and load-bearing performance of the structure. In this embodiment, the two embedded sections 31 are designed to be parallel to each other to ensure that they can bear the load evenly and maintain the stability of the structure. Simultaneously, the distance H between the two embedded sections 31 is set to 80-100mm. This range of spacing ensures that the interaction force between them is moderate, preventing stress concentration due to excessively small spacing and reducing the overall stability of the structure due to excessively large spacing. Preferably, the distance H between the two embedded sections 31 is 80mm, at which the stability and load-bearing performance of the structure are optimal.

[0055] Furthermore, as a preferred embodiment of this solution and not a limitation, the lower end of the pull ring body 3 is connected to an unloading cable 4, and the downward-facing end of the unloading cable 4 is connected to a scaffold 5.

[0056] In this embodiment, the pull ring body 3 serves as the core of the embedded structure and can be used to connect with the unloading cable 4. The unloading cable 4 is a high-strength, wear-resistant rope capable of withstanding and transmitting significant tensile forces. In practical applications, one end of the unloading cable 4 is connected to the lower end of the pull ring body 3, and the other end is connected to a suitable location on the scaffold 5. Through this connection method, when the scaffold 5 bears a large load, part of the load can be transferred to the cast-in-place beam 1 through the unloading cable 4 and the pull ring body 3. In this way, the load originally borne solely by the scaffold 5 is effectively distributed and transferred, thereby greatly reducing the load-bearing burden on the scaffold 5. This not only improves the stability and safety of the scaffold 5 but also extends its service life and reduces the occurrence of safety accidents such as damage or collapse caused by excessive loads.

[0057] Working principle of this utility model:

[0058] This invention proposes a pre-embedded unloading ring structure at the connection node between a cast-in-place beam and a cantilever slab. By pre-embedding the ring body at the bottom of the beam body, with one end protruding from the connection node between the beam body and the cantilever slab body, there is no need to reserve an opening in the cantilever slab body. This ensures that the subsequent connecting steel wire rope is in a straight line, optimizing the stress distribution between the steel wire rope and the structural beam, reducing the risk of structural damage. Simultaneously, it avoids problems such as steel wire rope collisions and wear with the cantilever slab due to inaccurate opening positions, as well as pressure damage to the cantilever slab. It also eliminates the risk of leakage caused by openings, improving the safety, durability, and waterproofing performance of the cantilever slab, simplifying construction steps, and increasing construction efficiency.

[0059] The above are implementation methods provided in conjunction with specific content, and it is not intended that the specific implementation of this application is limited to these descriptions. Any methods or structures that are similar to those of this application, or any technical deductions or substitutions made based on the concept of this application, should be considered within the scope of protection of this application.

Claims

1. A pre-embedded unloading ring structure at the connection node between a cast-in-place beam and a cantilever slab, comprising a beam body (1), wherein a cantilever slab body (2) extends and connects to the bottom of the beam body (1), characterized in that, The bottom of the beam body (1) is provided with a pull ring body (3), one end of which is located inside the beam body (1), and the other end extends out from the connection node between the beam body (1) and the cantilever slab body (2).

2. The unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab according to claim 1, characterized in that, The beam body (1) includes a first side template (11) on both sides and a bottom template (12) at the bottom. The bottom template (12) also serves as the forming support foundation for the cantilever slab body (2). A second side template (21) is provided on one side of the cantilever slab body (2). The second side template (21) is connected to the side of the bottom template (12). Beam reinforcement (13) is provided between the two first side templates (11). Cantilever slab reinforcement (22) is provided on the bottom template (12) and connected to the bottom of the beam reinforcement (13). The bottom template (12) is provided with an opening (121). A section of the pull ring body (3) is connected to the beam reinforcement (13), and one end passes through the opening (121).

3. The unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab according to claim 2, characterized in that, The beam reinforcement (13) includes main reinforcement (131) at the upper and lower ends, and a web reinforcement (132) is provided between the main reinforcement (131). Stirrups (133) are provided around the main reinforcement (131) and the web reinforcement (132). The lower part of the stirrups (133) is connected to the cantilever slab reinforcement (22). A section of the pull ring body (3) is fixedly connected to the web reinforcement (132) and the main reinforcement (131) at the lower end, and one end passes through the opening (121) on the bottom formwork (12).

4. The unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab according to claim 3, characterized in that, The pull ring body (3) includes two pre-embedded sections (31), and an exposed section (32) for connecting with other components is connected between the two pre-embedded sections (31). The pre-embedded section (31) includes a starting section (311), and the starting section (311) extends to be connected to a transition section (312). The transition section (312) extends to be connected to the exposed section (32). A first turning node (313) is provided at the connection between the starting section (311) and the transition section (312). The first turning node (313) is fixedly connected to the waist rib (132).

5. The unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab according to claim 4, characterized in that, A second turning node (314) is provided at the junction of the transition section (312) and the exposed section (32), and the second turning node (314) is fixedly connected to the main reinforcement (131) located at the lower end.

6. The unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab according to claim 4 or 5, characterized in that, The exposed section (32) is U-shaped.

7. The unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab according to any one of claims 2-5, characterized in that, The material of the pull ring body (3) is round steel with a diameter of 18-22mm, and the size of the opening (121) is adapted to the pull ring body (3).

8. The unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab according to claim 4, characterized in that, The length L1 of the starting segment (311) is 80-120mm, the distance L2 from the bottom of the exposed segment (32) to the transition segment is 80-120mm, and the length L3 of the transition segment (312) is 320-360mm.

9. The unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab according to claim 4, characterized in that, The two pre-embedded sections (31) are parallel to each other and the distance H between them is 80-100mm.

10. The unloading pull ring pre-embedded structure at the connection node between a cast-in-place beam and a cantilever slab according to claim 1, characterized in that, The lower end of the pull ring body (3) is connected to the unloading cable (4), and the lower end of the unloading cable (4) is connected to the scaffold (5).

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