Connecting joint of post-cast beam and prefabricated concrete beam and connecting method of connecting joint

Abstract

The connecting joint of the post-cast beam and the prefabricated concrete beam comprises the prefabricated beam, pre-buried bottom bars, pre-buried waist bars and pre-buried steel sleeves, and the pre-buried bottom bars and the pre-buried waist bars correspond to pre-buried bottom bar holes and pre-buried waist bar holes respectively; the embedded steel sleeve is fixed to the top of the precast beam, and the inner diameter of the embedded steel sleeve is matched with the outer diameter of a cast-in-place beam negative reinforcement. At least three additional stirrups are arranged on each of the left side and the right side of each embedded bar and connected with the embedded bars through welding or binding; the cast-in-situ beam comprises a cast-in-situ beam bottom bar, a cast-in-situ beam waist bar and a cast-in-situ beam negative bar, and the end parts of the cast-in-situ beam bottom bar and the cast-in-situ beam waist bar are provided with threads and are screwed and connected with the built-in nuts in the precast beam through the threads; the cast-in-place beam negative reinforcement is inserted into the pre-embedded steel sleeve at the top of the precast beam; and the cast-in-place layer covers the connecting part of the precast beam and the cast-in-place beam to form an integral structure. Through the pre-buried bottom bars, the pre-buried waist bars, the pre-buried steel sleeves and other components, reliable connection between the precast beam and the cast-in-place beam is achieved, and therefore the construction efficiency and the structural performance are greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of building construction, particularly to the construction technology of precast structures, and specifically to a connection node between a post-cast beam and a precast concrete beam and its connection method. Background Art

[0002] In the field of prefabricated buildings, the connection between a post-cast beam and a precast concrete beam has always been a key technical issue. Traditional connection methods often require reserved post-cast belts or grooves on the precast beam for the connection of steel bars and the pouring of concrete during subsequent construction. However, this method has many deficiencies: Firstly, reserving post-cast belts or grooves increases the complexity of precast beam production and the diversity of molds, resulting in an increase in production costs. When producing precast beams, specific molds need to be designed for post-cast belts or grooves, which not only increases the types and quantities of molds but also may lead to an increase in the scrap rate of molds because the molds are prone to wear or deformation after long-term use and can no longer meet production requirements.

[0003] Secondly, traditional connection methods require a rough surface to be set at the post-cast belt or groove to increase the bonding force between concretes. This step not only increases the construction difficulty but also may affect the overall performance of the structure. At the same time, in order to strengthen the structural strength at the post-cast belt or groove, a channel steel reinforcement needs to be set at the cross-section of the post-cast belt or groove, which further increases the construction cost and complexity.

[0004] In addition, traditional connection methods also need to set lifting points at the post-cast belt or groove for hoisting and positioning during construction. The setting of these lifting points not only increases the construction difficulty but also may have an adverse impact on the stability and safety of the structure. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above defects and propose a new connection method between a post-cast beam and a precast concrete beam, aiming to simplify the construction process, reduce production costs, and at the same time ensure the integrity and safety of the structure. This connection method cancels the step of originally reserving post-cast belts or grooves on the precast beam and realizes a reliable connection between the precast beam and the cast-in-place beam through components such as embedded bottom bars, embedded waist bars, embedded steel sleeves, and internal nuts, thus greatly improving the construction efficiency and structural performance.

[0006] To achieve the above purpose, the present invention is realized as follows: A connection node between a post-cast beam and a precast concrete beam, comprising: A precast beam (1), on the side of whose mold there are steel bar holes for the cast-in-place beam, including embedded bottom bar holes and embedded waist bar holes. The embedded bottom bar holes are located in the middle of the precast beam, and the embedded waist bar holes are located in the upper middle part. And at least two holes are reserved for each of the embedded bottom bar holes and the embedded waist bar holes; The embedded bottom reinforcement (3), embedded waist reinforcement (5), built-in nut (10) and embedded steel casing (7) embedded in the precast beam (1), where: The embedded bottom reinforcement (3) and the embedded waist reinforcement (5) respectively correspond to the embedded bottom reinforcement holes and the embedded waist reinforcement holes, and the ends are threaded, and are screwed and connected with the built-in nut (10) through the thread; The embedded steel casing (7) is fixed at the top of the precast beam (1), and its inner diameter matches the outer diameter of the cast-in-place beam negative reinforcement (8); Additional stirrups (11), at least three are arranged on each side of the left and right of each embedded reinforcement, that is, the embedded bottom reinforcement and the embedded waist reinforcement, and are connected to the embedded reinforcement by welding or binding; The cast-in-place beam (2) includes a cast-in-place beam bottom reinforcement (4), a cast-in-place beam waist reinforcement (6) and a cast-in-place beam negative reinforcement (8), where: The ends of the cast-in-place beam bottom reinforcement (4) and the cast-in-place beam waist reinforcement (6) are threaded, and are screwed and connected with the built-in nut (10) in the precast beam (1) through the thread; The cast-in-place beam negative reinforcement (8) is inserted into the embedded steel casing (7) at the top of the precast beam (1); The cast-in-place layer (9) covers the connection part of the precast beam (1) and the cast-in-place beam (2) to form an integral structure.

[0007] For the connection node of the post-cast beam and the precast concrete beam, the precast beam (1) cancels the design of the traditional post-cast strip or groove in the structure. Specifically: The mold of the precast beam (1) has no convex or concave structure for forming a post-cast strip or groove; There is no reserved post-cast strip or groove space inside the precast beam (1), and the embedded parts are directly arranged inside the beam body; During the steel bar arrangement and concrete pouring process of the precast beam (1), there is no need to consider special treatment at the post-cast strip or groove.

[0008] For the connection node of the post-cast beam and the precast concrete beam, the connection relationship between the embedded bottom reinforcement (3), the embedded waist reinforcement (5) and the built-in nut (10) is specifically: The threaded ends of the embedded bottom reinforcement (3) and the embedded waist reinforcement (5) match the internal thread of the built-in nut (10) to form a mechanical connection; A preset torque is applied to the connection part through a torque tool to ensure that the connection is firm and there is no looseness; After the connection, the axes of the embedded bottom reinforcement (3) and the embedded waist reinforcement (5) coincide with the axis of the built-in nut (10) to ensure the linearity of the force transmission path.

[0009] For the insertion relationship between the cast-in-place beam negative reinforcement (8) and the embedded steel casing (7) of the connection node of the post-cast beam and the precast concrete beam, specifically: The diameter of the cast-in-place beam negative reinforcement (8) is slightly smaller than the inner diameter of the embedded steel casing (7) to ensure smooth insertion; The insertion depth reaches at least 2 / 3 of the length of the embedded steel casing (7) to form an effective anchorage length; After insertion, a tight bonding interface is formed between the cast-in-place beam negative reinforcement (8) and the inner wall of the embedded steel casing (7) through concrete pouring.

[0010] For the connection node between the post-cast beam and the precast concrete beam, the layout relationship between the additional stirrups (11) and the embedded reinforcement, namely the embedded bottom reinforcement and the embedded waist reinforcement, is specifically as follows: The additional stirrups (11) are evenly arranged along the length direction of the embedded reinforcement, with at least three on each side of the left and right of each embedded reinforcement; The diameter, spacing and quantity of the additional stirrups (11) are determined according to the design requirements, and an effective restraint system is formed with the embedded reinforcement; The additional stirrups (11) are connected to the embedded reinforcement by welding or tying to ensure no displacement during the concrete pouring process.

[0011] For the connection node between the post-cast beam and the precast concrete beam, the bonding relationship between the cast-in-place layer (9) and the precast beam (1) and the cast-in-place beam (2) is specifically as follows: The concrete strength grade of the cast-in-place layer (9) is not lower than that of the precast beam (1) and the cast-in-place beam (2) to ensure the strength matching of the overall structure; The cast-in-place layer (9) completely covers the connection part of the precast beam (1) and the cast-in-place beam (2) to form a continuous concrete structure; A firm bond is formed between the cast-in-place layer (9) and the precast beam (1) and the cast-in-place beam (2) through the natural adhesive force and chemical adhesive of the concrete.

[0012] Furthermore, the present invention also proposes a construction method for the connection node between the post-cast beam and the precast concrete beam, including the following steps: Open the steel bar holes for the cast-in-place beam on the side of the mold of the precast beam (1); Produce the components of the embedded bottom reinforcement (3), the embedded waist reinforcement (5), the built-in nut (10) and the embedded steel casing (7); Place the embedded bottom reinforcement (3), the embedded waist reinforcement (5), and the built-in nut (10) in the mold of the precast beam (1), and align them with the corresponding hole positions in the mold. The embedded bottom reinforcement (3) is tightened with the built-in nut (10) by threads; Arrange at least three additional stirrups (11) on each side of the left and right of the embedded reinforcement, and connect them to the embedded reinforcement by welding or tying; Place and fix the embedded steel casing (7) on the top of the precast beam (1); After the steel bars of the precast beam (1) are tied up, carry out concrete pouring to produce the precast beam (1); Place the cast-in-place beam bottom reinforcement (4) and the cast-in-place beam waist reinforcement (6) in advance on-site. Assemble the precast beam (1) and the cast-in-place beam (2). Tighten the cast-in-place beam bottom reinforcement (4) and the cast-in-place beam waist reinforcement (6) with the built-in nuts (10) of the corresponding precast beam (1) by threading. Insert the cast-in-place beam negative reinforcement (8) into the embedded steel casing (7). Pour the cast-in-place layer (9) of the cast-in-place beam (2) and the precast beam (1), and the construction is completed.

[0013] The present invention realizes the efficient connection between the precast beam and the cast-in-place beam by presetting cast-in-place beam steel bar holes on the side of the precast beam mold and embedding bottom reinforcement, waist reinforcement with threads and built-in nuts. This design cancels the traditional post-cast strip or groove structure, simplifies the production mold and technological process of the precast beam, reduces the production cost and waste rate. At the same time, during on-site assembly, only by tightening the cast-in-place beam steel bars with the built-in nuts in the precast beam can a reliable connection be achieved, significantly improving the construction efficiency.

[0014] Furthermore, the present invention ensures the connection strength and integrity between the precast beam and the cast-in-place beam through the threaded tightening connection of the embedded bottom reinforcement, waist reinforcement and built-in nuts, and the design of inserting the cast-in-place beam negative reinforcement into the embedded steel casing. The arrangement of additional stirrups further enhances the bonding force between the embedded reinforcement and the precast beam concrete, improving the overall stability and load-bearing capacity of the structure. This multi-level connection design effectively avoids problems such as loosening and slipping that may occur in traditional connection methods, ensuring the safety and reliability of the structure.

[0015] Furthermore, the present invention also optimizes the force transmission path between the precast beam and the cast-in-place beam through precise steel bar arrangement and connection design. The direct connection of the embedded bottom reinforcement, waist reinforcement and the cast-in-place beam steel bars enables the load to be transmitted efficiently and stably, reducing stress concentration and deformation. At the same time, the pouring of the cast-in-place layer makes the precast beam and the cast-in-place beam form a continuous integral structure, further improving the overall stiffness and seismic performance of the structure.

[0016] In summary, the present technical solution has wide adaptability and can be adjusted and optimized according to different engineering requirements and design requirements. The production and on-site assembly processes of the precast beam have a high degree of standardization, facilitating large-scale production and popularization and application. In addition, this technical solution is also applicable to various types of building structures and bridge projects, with broad market prospects and application value. At the same time, by simplifying the construction process and reducing the amount of on-site wet work, this technical solution effectively reduces environmental pollution such as noise and dust during the construction process. At the same time, the standardized production of precast beams reduces material waste and energy consumption, meeting the current concept of green, low-carbon and sustainable development in the construction industry. In addition, this technical solution also improves the durability and service life of the building structure, reducing the later maintenance and repair costs. Description of the Drawings

[0017] Figure 1 This is the node diagram of the connection between a cast-in-place beam and a precast concrete beam of the present invention.

[0018] Figure 2 This is the sectional view of the connection between a cast-in-place beam and a precast concrete beam of the present invention.

[0019] Figure 3 This is the side view of the connection between a cast-in-place beam and a precast concrete beam of the present invention.

[0020] Figure 4 This is the front view of the connection between a cast-in-place beam and a precast concrete beam of the present invention.

[0021] Figure 5 This is the three-dimensional view of the connection between a cast-in-place beam and a precast concrete beam of the present invention. Detailed implementation manners

[0022] As Figures 1 to 5 , to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following takes a high-rise building precast assembled frame structure project example as an example to elaborate in detail the specific implementation process of the connection node technology scheme between this cast-in-place beam and the precast concrete beam. This building adopts a construction method combining precast concrete beams and cast-in-place concrete beams, and the reliable connection between the precast beam and the cast-in-place beam is achieved through this technical scheme.

[0023] I. Production preparation and fabrication of precast beams Mold design and processing According to the design drawings, customize the precast beam mold. On the side of the mold, accurately open the steel bar holes for the cast-in-place beam, including the embedded bottom steel bar holes and the embedded waist steel bar holes. The embedded bottom steel bar holes are located in the middle of the precast beam, and the embedded waist steel bar holes are located in the upper middle part. Two holes are reserved respectively, and the hole diameter matches the diameter of the embedded steel bar to ensure that the embedded steel bar can be smoothly inserted and fixed.

[0024] Production and preparation of embedded parts Embedded bottom steel bar 3 and embedded waist steel bar 5: Select steel bars that meet the design requirements, and process the ends into threads. The thread specifications match those of the built-in nut 10.

[0025] Built-in nut 10: Adopt high-strength nuts, and the internal threads are adapted to the threads of the embedded steel bars to ensure firm connection.

[0026] Embedded steel casing 7: Select a steel casing with a DN30 specification, with a smooth inner wall and no defects such as rust and burrs.

[0027] Additional stirrups 11: According to the design requirements, select steel bars with appropriate diameters to make additional stirrups to ensure that the stirrup spacing and quantity meet the specification requirements.

[0028] Steel bar binding and embedded part installation of precast beams Inside the precast beam mold, tie the steel bars according to the design drawings to form the steel bar framework of the precast beam.

[0029] Insert the embedded bottom steel bar 3 and the embedded waist steel bar 5 into the embedded bottom steel bar hole and the embedded waist steel bar hole on the side of the mold respectively, ensuring that the positions of the embedded steel bars are accurate and the verticality meets the requirements.

[0030] Tighten the built-in nut 10 with the threaded ends of the embedded bottom steel bar 3 and the embedded waist steel bar 5, and use a torque wrench to apply the preset torque to ensure that the connection is firm and there is no looseness.

[0031] Arrange three additional stirrups 11 on each side (left and right) of each embedded steel bar (embedded bottom steel bar and embedded waist steel bar), and connect them to the embedded steel bar by welding or tying to form an effective restraint system.

[0032] Place and fix the embedded steel casing 7 on the top of the precast beam, ensuring that the position of the embedded steel casing is accurate and firmly fixed.

[0033] Concrete pouring and curing of the precast beam Check whether the steel bar framework, embedded parts, etc. in the precast beam mold are installed in place. After confirmation, carry out concrete pouring.

[0034] Vibrate the concrete with a vibrating rod to ensure that the concrete is dense and has no cavities.

[0035] After pouring is completed, level and smooth the surface of the precast beam, then cover it with a plastic film for curing, and the curing time shall not be less than the design requirements.

[0036] II. On-site assembly and cast-in-place beam construction Transportation and hoisting of the precast beam After the precast beam is cured to reach the design strength, use a transport vehicle to transport it to the construction site.

[0037] Use a crane to lift the precast beam to the designated position and carry out temporary fixation to ensure that the position of the precast beam is accurate and the verticality meets the requirements.

[0038] Steel bar installation of the cast-in-place beam Place the bottom steel bar 4 and the waist steel bar 6 of the cast-in-place beam on-site in advance. The ends of the bottom steel bar 4 and the waist steel bar 6 of the cast-in-place beam are processed into threads, which are matched with the specifications of the built-in nut 10 in the precast beam 1.

[0039] Tighten and connect the bottom steel bar 4 and the waist steel bar 6 of the cast-in-place beam with the corresponding built-in nut 10 of the precast beam 1 respectively, and use a torque wrench to apply the preset torque to ensure a firm connection.

[0040] Insert the negative steel bar 8 of the cast-in-place beam into the embedded steel casing 7 on the top of the precast beam 1, and the insertion depth reaches at least 2 / 3 of the length of the embedded steel casing.

[0041] Installation of Cast-in-Place Beam Formwork According to the design requirements, install the formwork of the cast-in-place beam to ensure that the formwork has accurate dimensions, tight joints, and firm supports.

[0042] Clean the formwork, remove debris and accumulated water, and then apply a release agent to the inner wall of the formwork to facilitate subsequent demolding.

[0043] Concrete Pouring and Curing of Cast-in-Place Beam and Cast-in-Place Layer Check whether the steel bars, formwork, etc. of the cast-in-place beam are installed in place. After confirmation, carry out concrete pouring.

[0044] First, pour the concrete of the cast-in-place beam, adopting the method of layered pouring and layered vibration to ensure that the concrete is dense and has no cavities.

[0045] After the concrete pouring of the cast-in-place beam is completed, continue to pour the concrete of the cast-in-place layer 9 at the connection part between the precast beam and the cast-in-place beam, so that the cast-in-place layer completely covers the connection part of the precast beam and the cast-in-place beam, forming a continuous integral structure.

[0046] After pouring, level and smooth the concrete surface, and then cover it with a plastic film for curing. The curing time shall not be less than the design requirements.

[0047] III. Quality Inspection and Acceptance Quality Inspection of Precast Beam During the production process of the precast beam, conduct quality inspections on the processing, binding of steel bars, installation of embedded parts, pouring and curing of concrete, etc., to ensure that each process meets the design requirements and construction specifications.

[0048] After the precast beam is cured to reach the design strength, conduct appearance quality inspection and dimensional deviation detection to ensure that the appearance of the precast beam has no defects and the dimensions meet the design requirements.

[0049] Conduct a bearing capacity test on the precast beam to check whether the mechanical properties of the precast beam meet the design requirements.

[0050] Quality Inspection of On-Site Assembly and Cast-in-Place Beam During the hoisting of the precast beam, installation of steel bars of the cast-in-place beam, installation of formwork, etc., conduct quality inspections to ensure that the installation positions of each component are accurate and the connections are firm.

[0051] During the concrete pouring process of the cast-in-place beam and the cast-in-place layer, check the mix ratio, slump, etc. of the concrete to ensure that the concrete quality meets the requirements. After pouring, conduct curing and quality inspection of the concrete, including appearance quality inspection, dimensional deviation detection, strength detection, etc., to ensure that the quality of the cast-in-place beam and the cast-in-place layer meets the design requirements.

[0052] Project Acceptance After the construction of the connection node between the precast beam and the cast-in-situ beam is completed, relevant units are organized for project acceptance. The acceptance content includes the appearance quality, dimensional deviation, connection quality, concrete strength, etc. of the precast beam and the cast-in-situ beam.

[0053] After inspection and acceptance, all indicators meet the design requirements and construction specifications. The construction of the connection node between the post-cast beam and the precast concrete beam is qualified and can be put into use.

[0054] Through the above specific implementation methods, the technical solution of the connection node between the post-cast beam and the precast concrete beam has been effectively applied in the actual project, realizing the reliable connection between the precast beam and the cast-in-situ beam, improving the construction efficiency, ensuring the project quality, and having significant technical advantages and economic benefits.

[0055] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to form an equivalent embodiment with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modification, equivalent change, and modification made to the above embodiment based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A connecting node between a post-cast beam and a precast concrete beam, characterized in that, Comprising: A precast beam (1), on the side of whose mold there are steel bar holes for the cast-in-place beam, including embedded bottom steel bar holes and embedded waist steel bar holes. The embedded bottom steel bar holes are located in the middle of the precast beam, and the embedded waist steel bar holes are located in the upper middle part. And at least two holes are reserved for each of the embedded bottom steel bar holes and the embedded waist steel bar holes. Embedded bottom steel bars (3), embedded waist steel bars (5), built-in nuts (10) and embedded steel sleeves (7) embedded in the precast beam (1), wherein: The embedded bottom steel bars (3) and the embedded waist steel bars (5) respectively correspond to the embedded bottom steel bar holes and the embedded waist steel bar holes, and the ends are threaded and are screwed and connected with the built-in nuts (10) through the threads. The embedded steel sleeve (7) is fixed at the top of the precast beam (1), and its inner diameter matches the outer diameter of the negative steel bar (8) of the cast-in-place beam. Additional stirrups (11), at least three are arranged on each of the left and right sides of each embedded steel bar, i.e., the embedded bottom steel bar and the embedded waist steel bar, and are connected with the embedded steel bar by welding or tying. A cast-in-place beam (2), including a cast-in-place beam bottom steel bar (4), a cast-in-place beam waist steel bar (6) and a cast-in-place beam negative steel bar (8), wherein: The ends of the cast-in-place beam bottom steel bar (4) and the cast-in-place beam waist steel bar (6) are threaded and are screwed and connected with the built-in nuts (10) in the precast beam (1) through the threads. The cast-in-place beam negative steel bar (8) is inserted into the embedded steel sleeve (7) at the top of the precast beam (1). A cast-in-place layer (9) covers the connection part of the precast beam (1) and the cast-in-place beam (2) to form an integral structure.

2. The connecting node of the cast-in-place beam and the precast concrete beam according to claim 1, characterized in that, The precast beam (1) cancels the design of the traditional post-cast strip or groove in terms of structure. Specifically: There is no convex or concave structure on the mold of the precast beam (1) for forming a post-cast strip or groove. There is no reserved post-cast strip or groove space inside the precast beam (1), and the embedded parts are directly arranged inside the beam body. During the steel bar arrangement and concrete pouring process of the precast beam (1), there is no need to consider special treatment at the post-cast strip or groove.

3. The connection node between the post-cast beam and the precast concrete beam according to claim 1, characterized in that, The connection relationship between the embedded bottom steel bar (3), the embedded waist steel bar (5) and the built-in nut (10) is specifically: The threaded ends of the embedded bottom steel bar (3) and the embedded waist steel bar (5) match the internal threads of the built-in nut (10) to form a mechanical connection. A preset torque is applied to the connection part through a torque tool to ensure that the connection is tight and there is no looseness. After connection, the axes of the embedded bottom steel bar (3), the embedded waist steel bar (5) and the built-in nut (10) coincide to ensure the linearity of the force transmission path.

4. The connection node between the cast-in-place beam and the precast concrete beam according to claim 1, characterized in that, The insertion relationship between the cast-in-place beam negative steel bar (8) and the embedded steel sleeve (7) is specifically: The diameter of the cast-in-place beam negative steel bar (8) is slightly smaller than the inner diameter of the embedded steel sleeve (7) to ensure smooth insertion. The insertion depth reaches at least 2 / 3 of the length of the embedded steel sleeve (7) to form an effective anchorage length. After insertion, a tight bonding interface is formed between the cast-in-place beam negative steel bar (8) and the inner wall of the embedded steel sleeve (7) through concrete pouring.

5. The connecting node between the post-cast beam and the precast concrete beam according to claim 1, characterized in that, The arrangement relationship between the additional stirrup (11) and the embedded steel bars, i.e., the embedded bottom steel bar and the embedded waist steel bar, is specifically: The additional stirrups (11) are uniformly arranged along the length direction of the embedded steel bars, and at least three are arranged on each of the left and right sides of each embedded steel bar. The diameter, spacing and quantity of the additional stirrups (11) are determined according to the design requirements to form an effective restraint system with the embedded steel bars. The additional stirrups (11) are connected to the embedded bars by welding or tying to ensure that there is no displacement during the concrete pouring process.

6. The connecting node of the post-cast beam and the precast concrete beam according to claim 1, characterized in that, The bonding relationship between the cast-in-place layer (9), the precast beam (1) and the cast-in-place beam (2) is specifically as follows: The concrete strength grade of the cast-in-place layer (9) is not lower than that of the precast beam (1) and the cast-in-place beam (2) to ensure the strength matching of the overall structure; The cast-in-place layer (9) completely covers the connection part of the precast beam (1) and the cast-in-place beam (2) to form a continuous concrete structure; A firm bond is formed between the cast-in-place layer (9), the precast beam (1) and the cast-in-place beam (2) through the natural adhesive force and chemical binder of the concrete.

7. A construction method for the connection node between a post-cast beam and a precast concrete beam as described in any one of claims 1 to 6, characterized in that, It includes the following steps: Open the steel bar holes for the cast-in-place beam on the side of the mold of the precast beam (1); Produce the components of the embedded bottom bars (3), embedded waist bars (5), built-in nuts (10) and embedded steel sleeves (7); Place the embedded bottom bars (3), embedded waist bars (5) and built-in nuts (10) in the mold of the precast beam (1), align them with the corresponding hole positions in the mold, and tighten the embedded bottom bars (3) and the built-in nuts (10) by threads; Arrange at least three additional stirrups (11) on both the left and right sides of the embedded bars and connect them to the embedded bars by welding or tying; Place and fix the embedded steel sleeve (7) on the top of the precast beam (1); After the steel bars of the precast beam (1) are tied up, conduct concrete pouring to produce the precast beam (1); Place the bottom bars (4) and waist bars (6) of the cast-in-place beam on site in advance, assemble the precast beam (1) and the cast-in-place beam (2), and tighten the bottom bars (4) and waist bars (6) of the cast-in-place beam with the built-in nuts (10) of the corresponding precast beam (1) by threads; Insert the negative bars (8) of the cast-in-place beam into the embedded steel sleeve (7); Pour the cast-in-place beam (2) and the cast-in-place layer (9) of the precast beam (1), and the construction is completed.

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