Prefabricated beam-column connecting joint

Abstract

According to the specific implementation mode, a prefabricated column is a cross-layer prefabricated column, post-pouring concrete is arranged in a beam-column joint area, longitudinal bars at the bottom of a prefabricated beam are connected with lengthened steel bars through connecting sleeves, steel strands are anchored into the joint to achieve avoidance, and longitudinal bars at the top of the beam penetrate through the beam-column joint area in a laminated layer. A supporting device is arranged on the prefabricated column to temporarily support the end of the prefabricated beam in the construction period. According to the implementation mode, on the basis that the prefabricated columns are used for supporting the prefabricated beams to achieve floor system support-free construction, the connection integrity equivalent to a cast-in-place structure is achieved through the post-pouring beam column joint area, and the manufacturing error of the prefabricated parts is absorbed; meanwhile, the supporting device is small in steel consumption, the prefabricated column is easy to pre-embed in the production process, the installation error-tolerant rate is high, connection construction is convenient and fast, and steel bar connection operation does not affect the position precision of the installed prefabricated part.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction, relates to an assembled concrete frame structure, and particularly relates to a prefabricated beam-column connection node. Background Art

[0002] In the prefabricated concrete frame structure, the support-free construction of the floor system can be achieved by supporting the prefabricated beams with prefabricated columns. The prefabricated columns are prefabricated in multiple layers to simplify the connection of prefabricated columns and improve the efficiency of on-site hoisting. However, the problem of steel bar collision in the beam-column node area needs to be solved. The existing technology solves the problem of steel bar collision in the beam-column node area by pre-embedded steel connection nodes, and uses a construction method similar to that of steel structures to support the prefabricated beams with the help of prefabricated columns. However, the above method usually has the following technical problems:

[0003] First, in order to ensure the connection strength and rigidity, the steel connection nodes are large in size and require a large amount of steel, making it difficult to embed the prefabricated columns during production;

[0004] Second, steel connection nodes require high manufacturing accuracy of prefabricated beams and columns, and low installation error tolerance;

[0005] Third, when the extended steel bars at the beam-column joint are connected to the longitudinal bars of the prefabricated beam, high requirements are placed on the steel bar positioning accuracy, which can easily affect the installation accuracy of the prefabricated components during steel bar connection construction. Utility Model Content

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the utility model proposes a prefabricated beam-column connection node, which realizes the connection of prefabricated beams and prefabricated columns by post-poured concrete, and has good connection integrity. At the same time, it avoids one or more problems of the prior art, such as large amount of steel used, difficulty in pre-embedding connecting parts, low installation fault tolerance, and connection construction easily affecting the installation accuracy of prefabricated components.

[0007] Some embodiments of the utility model provide a prefabricated beam-column connection node for realizing the connection of prefabricated beams and prefabricated columns, wherein the prefabricated columns are cross-layer prefabricated columns, and the beam-column node area is post-cast concrete, wherein an installation seam is arranged at the end of the prefabricated beam away from the side of the prefabricated column, and the size of the installation seam along the length direction of the prefabricated beam is 8 to 20 cm, and a connecting sleeve is arranged at the end of the prefabricated beam for the longitudinal reinforcement at the bottom of the prefabricated beam, and the longitudinal reinforcement at the bottom of the prefabricated beam corresponding to the two prefabricated beams in the same direction are respectively anchored into the beam-column node area by extending steel bars and steel strands; a beam superposition layer is arranged at the top of the prefabricated beam, and the longitudinal reinforcement at the top of the beam is arranged in the beam superposition layer, and the longitudinal reinforcement at the top of the beam corresponding to the two prefabricated beams in the same direction is connected in the beam-column node area; a supporting device is arranged on the prefabricated column, and the supporting device is in contact with the end of the prefabricated beam, and the prefabricated column supports the prefabricated beam during construction.

[0008] Specifically, the connecting sleeve is an internal threaded sleeve, the end of the extended steel bar is provided with an external thread that is screwed into the connecting sleeve, the end of the steel strand is provided with an extrusion sleeve, and the extrusion sleeve is connected to a screw rod that is screwed into the connecting sleeve through the screw rod.

[0009] In some embodiments, the supporting device is arranged in the beam-column node area, a steel base plate is embedded in the top surface of the lower column below the beam-column node area, supporting legs are welded on the steel base plate, and beam extending steel plates are embedded in the ends of the prefabricated beams, and the beam extending steel plates are placed on the supporting legs.

[0010] Specifically, the length of the beam extending steel plate extending into the prefabricated beam is 10 to 20 cm, the length of the beam extending steel plate extending out of the prefabricated beam is 2 to 5 cm shorter than the dimension of the installation seam along the length direction of the prefabricated beam, the end of the beam extending steel plate extending into the prefabricated beam is welded with anchor bars, the bottom of the beam extending steel plate extending out of the prefabricated beam is welded with a horizontal pad, and the upper part of the beam extending steel plate near the end of the prefabricated beam is welded with a stress diffusion plate.

[0011] In particular, the supporting leg is composed of a vertical plate and a horizontal brace plate. The vertical plate is welded to the steel bottom plate, the horizontal brace plate is welded above the vertical plate, the horizontal brace plate runs through the beam-column node area, and the vertical plate is arranged outside the range of the extended steel bars.

[0012] Optionally, the beam overhanging steel plate is connected to the supporting leg by bolts.

[0013] In some embodiments, the supporting device is arranged on the side of the prefabricated column below the beam-column node area. The supporting device is composed of a column side steel plate, a beam bottom steel plate and stiffening ribs. The column side steel plate is connected to the prefabricated column by bolts. The beam bottom steel plate extends over the end of the prefabricated beam and extends 8 to 15 cm toward the prefabricated beam. The prefabricated beam is placed on the beam bottom steel plate.

[0014] Optionally, part of the beam top longitudinal reinforcement is placed within the floor slab adjacent to the beam superimposed layer.

[0015] In some embodiments, the bottom surface of the upper column above the beam-column node area is an inclined surface, the center of the upper column bottom surface is 10 to 20 mm lower than the outer edge, and the outer edge of the upper column bottom surface is 5 to 20 mm lower than the top surface of the beam composite layer.

[0016] Optionally, an anchor plate is provided at the end of the extended steel bar away from the connecting sleeve, and a 90° hook is provided at the end of the steel strand away from the connecting sleeve.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) The precast beams and precast columns of the utility model are connected by post-casting the beam-column node area, and the connection integrity is good. The design can be carried out according to the "equivalent cast-in-place" method, which is convenient for design.

[0019] (2) The utility model can realize support-free construction of floor slabs by means of prefabricated columns supporting prefabricated beams, and the amount of steel used in the supporting connectors is small and can even be reused, which is low in cost.

[0020] (3) The longitudinal reinforcements at the bottom and top of the precast beams of the utility model are directly anchored into the post-cast beam-column node area, which can avoid steel bar collisions, reduce the requirements for the manufacturing accuracy of the precast components, and the steel bar connection construction does not affect the installation accuracy of the precast components. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic structural diagram of some embodiments of the prefabricated beam-column connection node in the utility model, wherein the support device is arranged in the beam-column node area.

[0023] Figure 2 for Figure 1 Schematic diagram of the local structure where the longitudinal reinforcement at the bottom of the precast beam is anchored into the beam-column node area.

[0024] Figure 3 yes Figure 1 Schematic diagram of the structure of the support device on the prefabricated column.

[0025] Figure 4 for Figure 1 Schematic diagram of the connection structure between precast beams and precast columns.

[0026] Figure 5 for Figure 1 Schematic diagram of the connection structure between the middle long steel bars, steel strands and precast beams.

[0027] Figure 6 yes Figure 5 Schematic diagram of the structure of the medium steel strand.

[0028] Figure 7 It is a schematic structural diagram of some other embodiments of the prefabricated beam-column connection node in the utility model, wherein the support device is arranged on the side of the prefabricated column below the beam-column node area.

[0029] In the figure: 1-precast beam; 11-bottom longitudinal reinforcement; 12-connecting sleeve; 13-extending steel bar; 14-steel strand; 141-extrusion sleeve; 142-screw; 15-beam superimposed layer; 16-beam top longitudinal reinforcement; 2-precast column; 21-lower column; 22-upper column; 23-precast column longitudinal reinforcement; 3-beam-column node area; 31-node area stirrups; 4-installation joint; 5-support device; 51-steel bottom plate; 52-support leg; 521-vertical plate; 522-horizontal support plate; 523-ear plate; 524-bolt; 53-beam extension steel plate; 531-anchor bar; 532-horizontal pad; 533-stress diffusion plate; 54-column side steel plate; 55-beam bottom steel plate; 56-stiffening rib; 57-fastening bolt. DETAILED DESCRIPTION

[0030] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, the embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0031] Unless otherwise specified, the technical and scientific terms used in this document have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs; other experimental methods and technical means not specifically specified in this application refer to experimental methods and technical means commonly used by ordinary technicians in this field.

[0032] The utility model provides a prefabricated beam-column connection node, which has the advantages of good connection integrity and high fault tolerance. At the same time, the support-free construction of the floor slab can be realized with the help of prefabricated columns, avoiding the shortcomings of the prior art such as large amount of steel used, great difficulty in pre-embedding of connecting parts, low installation fault tolerance, and connection construction easily affecting the installation accuracy of prefabricated components.

[0033] refer to Figure 1 , Figure 2The utility model discloses a prefabricated beam-column connection node for realizing the connection between a prefabricated beam 1 and a prefabricated column 2. The prefabricated column 2 is a cross-layer prefabricated column. The beam-column node area 3 is post-cast concrete. That is to say, the prefabricated column 2 prefabricates the multi-layer columns including the lower column 21 and the upper column 22 as a whole. The beam-column node area 3 reserves a space for post-cast concrete. The prefabricated column longitudinal reinforcement 23 continuously passes through the lower column 21 and the upper column 22, which can avoid the connection construction of the lower column 21 and the upper column 22 on the construction site. Among them, an installation seam 4 is arranged at the end of the prefabricated beam 1 away from the side of the prefabricated column 2. The size of the installation seam 4 along the length direction of the prefabricated beam 1 is 8 to 20 cm. The longitudinal reinforcement 11 at the bottom of the prefabricated beam 1 A connecting sleeve 12 is arranged at the end of the precast beam 1, and the bottom longitudinal reinforcement 11 of the precast beam 1 corresponding to the two precast beams 1 in the same direction are anchored into the beam-column node area 3 by extending steel bars 13 and steel strands 14 respectively; a beam superposition layer 15 is arranged on the top of the precast beam 1, and the beam top longitudinal reinforcement 16 is arranged in the beam superposition layer 15, and the beam top longitudinal reinforcement 16 corresponding to the two precast beams 1 in the same direction passes through the beam-column node area 3; a supporting device 5 is arranged on the precast column 2, and the supporting device 5 is in contact with the end of the precast beam 1. During construction, the precast column 2 supports the precast beam 1, thereby realizing the support-free construction of the floor system, reducing the construction safety risk and the cost of temporary measures, and improving the on-site construction efficiency.

[0034] In the description of the present invention, it should be noted that the terms "top", "above" and "below" are based on the orientation or positional relationship of the prefabricated beam-column connection nodes of the present invention when they are used. The above terms restrict the orientation and structure of the prefabricated beam-column connection nodes of the present invention.

[0035] refer to Figure 1 to Figure 6 , shows a schematic diagram of the structure of some embodiments of the prefabricated beam-column connection node of the utility model, wherein the support device is arranged in the beam-column node area. Figure 1 , Figure 2 As shown, the precast beam 1 is a composite beam, and the precast column 2 is a cross-layer precast column that is integrally prefabricated with a lower column 21 and an upper column 22. The beam-column node area 3 corresponding to the precast column 2 is reserved with a space for post-cast concrete. The precast column longitudinal reinforcement 23 passes through the beam-column node area 3 and is continuously connected along the lower column 21 and the upper column 22. There is no need to carry out connection construction of the lower column 21 and the upper column 22 on the construction site. The construction of the precast column 2 is simple, and the problem of longitudinal reinforcement connection of the precast beam 1 caused by the cross-layer precast column needs to be solved.

[0036] See also Figure 1 , Figure 2 , Figure 4 , Figure 5The bottom longitudinal reinforcement 11 of the precast beam 1 is provided with a connecting sleeve 12 at the end of the precast beam 1. The connecting sleeve 12 is completely embedded in the concrete of the precast beam 1 or partially extends out of the end of the precast beam 1. The bottom longitudinal reinforcement 11 of the precast beam 1 corresponding to the two precast beams 1 in the same direction are respectively connected with the connecting steel bar 13 and the steel strand 14 through the connecting sleeve 12 and anchored into the beam-column node area 3. The steel strand 14 is made of multiple strands of steel wire. Compared with the ordinary steel bar steel strand 14, it has a certain flexibility and can automatically achieve the avoidance of the connecting steel bar 13 of another precast beam 1 in the same direction, avoiding construction. Collision; The bottom longitudinal reinforcement 11 of the two precast beams 1 in the same direction corresponding to the width direction of the precast beam 1 is staggered with extended steel bars 13 and steel strands 14 anchored in the beam-column node area 3, that is to say, a part of the bottom longitudinal reinforcement 11 of the same precast beam 1 is anchored in the beam-column node area 3 with extended steel bars 13, and a part of it is anchored in the beam-column node area 3 with steel strands 14. The steel strands 14 avoid the longitudinal reinforcement of the opposite precast beam 1. The extended steel bars 13 ensure that the composite beam has a certain energy dissipation capacity under the action of the bending moment at the beam end, taking into account both the construction convenience and the seismic performance of the structure.

[0037] Specifically, the connecting sleeve 12 is an internal threaded sleeve, one end of the connecting sleeve 12 is connected to the end of the bottom longitudinal reinforcement 11 by a thread, and the other end of the connecting sleeve 12 is connected to the extended steel bar 13 or the steel strand 14 to achieve force transmission between the bottom longitudinal reinforcement 11 and the extended steel bar 13 or the steel strand 14; when the extended steel bar 13 is connected, the strength grade and diameter of the extended steel bar 13 are the same as those of the bottom longitudinal reinforcement 11, and the end of the extended steel bar 13 is provided with an external thread and screwed into the connecting sleeve 12; see Figure 6 , an extrusion sleeve 141 is provided at the end of the steel strand 14. Under the action of the extrusion force, the extrusion sleeve 141 undergoes plastic deformation to connect with the steel strand 14. The end of the extrusion sleeve 141 is connected with a screw 142, which is screwed into the connecting sleeve 12 to connect the steel strand 14 with the connecting sleeve 12. In some embodiments, when the side length of the prefabricated column 2 is less than 50 cm, an anchor plate is provided at the end of the extension steel bar 13 away from the connecting sleeve 12 to improve the anchoring performance of the extension steel bar 13 in the post-cast concrete of the beam-column node area 3; a 90° hook is provided at the end of the steel strand 14 away from the connecting sleeve 12 to improve the anchoring performance of the steel strand 14 in the post-cast concrete of the beam-column node area 3.

[0038] In some embodiments, the steel strand 14 is directly connected to the corresponding bottom longitudinal reinforcement 11 when the precast beam 1 is produced. The steel strand 14 is pre-buried in the precast beam 1. The steel strand 14 has a certain flexibility. During the hoisting process of the precast beam 1 at the construction site, the steel strand 14 is inserted into the corresponding position of the beam-column node area 3, and the installation of the precast beam 1 will not be affected by collision problems.

[0039] After the prefabricated beam 1 is hoisted in place, the extension steel bar 13 or steel strand 14 is connected to facilitate the construction. Figure 1 , Figure 2An installation seam 4 is provided at the end of the prefabricated beam 1 and the side of the prefabricated column 2. The size of the installation seam 4 along the length direction of the prefabricated beam 1 is 8 to 20 cm. The installation seam 4 serves as a construction space for the extension of the steel bar 13 or the steel strand 14.

[0040] See also Figure 1 , Figure 2 A beam superposition layer 15 is arranged on the top of the precast beam 1, and the beam top longitudinal reinforcement 16 is arranged in the beam superposition layer 15. The beam top longitudinal reinforcement 16 corresponding to the two precast beams 1 in the same direction penetrates in the beam-column node area 3; when the beam top longitudinal reinforcement 16 in two directions, the beam top longitudinal reinforcement 16 in one direction is bent downward to avoid in the beam-column node area 3.

[0041] The precast beams 1 are supported by precast columns 2 at the construction site to realize the support-free construction of the floor system. Figure 1 , Figure 2 A supporting device 5 is provided on the prefabricated column 2. The supporting device 5 is in contact with the end of the prefabricated beam 1. The supporting device 5 is arranged in the beam-column node area 3. Each end of the prefabricated beam 1 corresponds to a group of supporting devices 5. The supporting device 5 is used to realize the vertical support of the prefabricated column 2 to the prefabricated beam 1 during construction. The supporting device 5 consists of a column end part and a beam end part.

[0042] Combination Figure 3 , a steel bottom plate 51 is pre-buried on the top surface of the lower column 21 below the beam-column node area 3, and the steel bottom plates 51 corresponding to the ends of different precast beams 1 are interconnected to facilitate pre-embedded positioning and improve the integrity of force. After the precast column 2 is manufactured, a support leg 52 is welded on the steel bottom plate 51, and the support leg 52 is composed of a vertical plate 521 and a horizontal support plate 522. The vertical plate 521 is welded and fixed to the steel bottom plate 51, and the horizontal support plate 522 is welded above the vertical plate 521; the horizontal support plates 522 corresponding to the two precast beams 1 in the same direction are connected along the beam-column node area 3, so as to improve the stability under the construction load and ensure the construction safety. At the same time, when the structure is subjected to force, the horizontal support plate 522 and the steel bottom plate 51 can replace the stirrups 31 in the node area to bear a certain shear force in the beam-column node area 3, see Figure 1 , Figure 2 , the node area stirrups 31 are not provided within the height range of the support leg 52, that is, the node area stirrups 31 are provided starting from above the top surface of the horizontal support plate 522, so as to facilitate the welding installation of the support leg 52; the vertical plates 521 corresponding to different prefabricated beams 1 are independent of each other and are not connected, see Figure 2 , the vertical plate 521 is arranged outside the range of the extended steel bar 13 to prevent the vertical plate 521 from affecting the installation of the extended steel bar 13. When manufacturing the prefabricated column 2, only the steel bottom plate 51 needs to be embedded, which greatly simplifies the end mold of the prefabricated column 2, and the embedding construction is simple. At the same time, the position accuracy of the support leg 52 can be ensured by subsequent welding construction, which greatly reduces the positioning accuracy requirements for the embedded steel bottom plate 51 and improves the manufacturing efficiency of the prefabricated column 2.

[0043] Combination Figure 5 The end of the precast beam 1 is pre-buried with a beam extension steel plate 53, which is arranged along the vertical plane and extends into the precast beam 1 by 10 to 20 cm. The length of the beam extension steel plate 53 extending out of the precast beam 1 is 2 to 5 cm shorter than the dimension of the installation seam 4 along the length direction of the precast beam 1, so as to avoid the collision between the beam extension steel plate 53 and the precast beam 1 during the hoisting process of the precast beam 1; the end of the beam extension steel plate 53 extending into the precast beam 1 is welded with an anchor bar 531, and the anchor bar 531 is used to enhance the anchorage of the beam extension steel plate 53 in the precast beam 1 The size of the beam extension steel plate 53 can be controlled and the amount of steel used can be reduced; a horizontal pad 532 is welded at the bottom of the part of the beam extension steel plate 53 extending out of the precast beam 1, which can expand the contact surface between the beam extension steel plate 53 and the support leg 52 after being installed in place; a stress diffusion plate 533 is welded at the upper part of the beam extension steel plate 53 close to the end of the precast beam 1. Under the action of construction load, the upper part of the beam extension steel plate 53 is subjected to pressure, and the stress diffusion plate 533 can diffuse the upper pressure of the beam extension steel plate 53 into the concrete, thereby avoiding local concrete compression damage.

[0044] See also Figure 4 After the prefabricated beam 1 is installed in place, the beam protruding steel plate 53 is automatically placed on the supporting leg 52; in some embodiments, an ear plate 523 is welded on the supporting leg 52, and the beam protruding steel plate 53 is fastened to the ear plate 523 of the supporting leg 52 by bolts 524, so as to prevent the prefabricated beam 1 from rotating or overturning under the uneven construction load on both sides, thereby ensuring construction safety.

[0045] After the longitudinal reinforcement of the precast beam 1 is tied, the stirrups 31 reserved in advance on the precast column 2 are tied and fixed to the designed position, and the post-cast concrete in the beam-column node area 3 and the beam superimposed layer 15 is poured at the same time. Figure 1 The bottom surface of the upper column 22 above the beam-column node area 3 is set as an inclined surface. Specifically, the center of the bottom surface of the upper column 22 is 10-20 mm lower than the outer edge, and the outer edge of the bottom surface of the upper column 22 is 5-20 mm lower than the top surface of the beam composite layer 15, so as to avoid air accumulation under the bottom surface of the upper column 22 during the pouring of the post-cast concrete and improve the compactness of the post-cast concrete under the bottom surface of the upper column 22.

[0046] See next Figure 7 . Figure 7 Schematic diagrams of other embodiments of prefabricated beam-column connection nodes, wherein the support device is arranged on the side of the prefabricated column below the beam-column node area. Figure 7As shown, the support device 5 is arranged on the side of the prefabricated column below the beam-column node area 3, and the support device 5 is composed of a column side steel plate 54, a beam bottom steel plate 55 and a stiffening rib 56, wherein the column side steel plate 54 is connected to the prefabricated column 2 by a plurality of fastening bolts 57, and the beam bottom steel plate 55 extends 8 to 15 cm over the end of the prefabricated beam 1 toward the prefabricated beam 1. After the prefabricated beam 1 is installed in place at the construction site, the prefabricated beam 1 is placed on the beam bottom steel plate 55, so that the prefabricated column 2 supports the prefabricated beam 1; the beam bottom steel plate 55 can also serve as a template for the lower part of the installation joint 4, and can also support the template of the beam-column node area 3, thereby simplifying the formwork work.

[0047] In general, the number of longitudinal bars 16 at the top of the composite beam is greater than the number of longitudinal bars 11 at the bottom. When the number of longitudinal bars 16 at the top of the beam is too large and affects the construction, refer to Figure 7 At the construction site, part of the beam top longitudinal reinforcement 16 is placed within the floor slab adjacent to the beam superimposed layer 15 to avoid the beam top longitudinal reinforcement 16 in the beam superimposed layer 15 being too dense, which would affect the pouring and vibration of the post-cast concrete in the beam-column node area 3 and the beam superimposed layer 15.

[0048] In summary, in the present invention, the anchoring method of the longitudinal reinforcement at the bottom of the precast beam in the beam-column node area and the optimization of the supporting device are used to achieve the connection integrity of the beam-column "equivalent to a cast-in-place structure". The structural design is simple, the precast component manufacturing errors are absorbed by the post-cast beam-column node, and the fault tolerance is high. The support-free construction of the floor slab is achieved with the help of cross-layer precast columns. At the same time, the shortcomings of the prior art such as large amount of steel consumption, difficulty in pre-embedded connecting parts, low installation fault tolerance, and connection construction that easily affects the installation accuracy of precast components are avoided.

[0049] The above description is only some preferred embodiments of the utility model and an explanation of the technical principles used. Those skilled in the art should understand that the disclosure scope involved in the embodiments of the utility model is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the embodiments of the utility model (but not limited to) to form a technical solution.

Claims

1. A prefabricated beam-column connection node, used to realize the connection of prefabricated beams and prefabricated columns, the prefabricated columns are cross-layer prefabricated columns, and the beam-column node area is post-cast concrete, characterized in that: An installation seam is set at the end of the precast beam from the side of the precast column. The size of the installation seam along the length direction of the precast beam is 8 to 20 cm. A connecting sleeve is set at the end of the precast beam for the bottom longitudinal reinforcement. The bottom longitudinal reinforcements of the two precast beams in the same direction are respectively anchored into the beam-column node area with extended steel bars and steel strands; A beam laminate layer is arranged on the top of the precast beam, and the longitudinal reinforcement on the top of the beam is arranged in the beam laminate layer. The longitudinal reinforcement on the top of the beam corresponding to the two precast beams in the same direction penetrates in the beam-column node area; The precast columns are provided with supporting devices, which are in contact with the ends of the precast beams. The precast columns support the precast beams during construction.

2. The prefabricated beam-column connection node according to claim 1, characterized in that: The connecting sleeve is an internal threaded sleeve, the end of the extended steel bar is provided with an external thread that is screwed into the connecting sleeve, the end of the steel strand is provided with an extrusion sleeve, and the extrusion sleeve is connected to a screw rod that is screwed into the connecting sleeve through the screw rod.

3. The prefabricated beam-column connection node according to claim 1, characterized in that: The supporting device is arranged in the beam-column node area, a steel bottom plate is embedded in the top surface of the lower column below the beam-column node area, supporting legs are welded on the steel bottom plate, and a beam extending steel plate is embedded in the end of the prefabricated beam, and the beam extending steel plate is placed on the supporting legs.

4. The prefabricated beam-column connection node according to claim 3, characterized in that: The length of the beam extending steel plate extending into the prefabricated beam is 10 to 20 cm, and the length of the beam extending steel plate extending out of the prefabricated beam is 2 to 5 cm shorter than the dimension of the installation seam along the length direction of the prefabricated beam. Anchor bars are welded to the end of the beam extending steel plate extending into the prefabricated beam, a horizontal pad is welded to the bottom of the part of the beam extending steel plate extending out of the prefabricated beam, and a stress diffusion plate is welded to the upper part of the beam extending steel plate near the end of the prefabricated beam.

5. The prefabricated beam-column connection node according to claim 3, characterized in that: The support leg is composed of a vertical plate and a horizontal support plate. The vertical plate is welded to the steel bottom plate, and the horizontal support plate is welded above the vertical plate. The horizontal support plate runs through the beam-column node area, and the vertical plate is arranged outside the range of the extended steel bars.

6. The prefabricated beam-column connection node according to claim 3, characterized in that: The beam extension steel plate is connected to the supporting legs by bolts.

7. The prefabricated beam-column connection node according to claim 1, characterized in that: The supporting device is arranged on the side of the prefabricated column below the beam-column node area. The supporting device consists of a column side steel plate, a beam bottom steel plate and stiffening ribs. The column side steel plate is connected to the prefabricated column by fastening bolts. The beam bottom steel plate extends 8 to 15 cm beyond the end of the prefabricated beam toward the prefabricated beam, and the prefabricated beam is placed on the beam bottom steel plate.

8. The prefabricated beam-column connection node according to claim 1, characterized in that: Some of the longitudinal reinforcement at the top of the beam is placed within the floor slab adjacent to the beam superimposed layer.

9. The prefabricated beam-column connection node according to claim 1, characterized in that: The bottom surface of the upper column above the beam-column node area is an inclined surface, the center of the upper column bottom surface is 10 to 20 mm lower than the outer edge, and the outer edge of the upper column bottom surface is 5 to 20 mm lower than the top surface of the beam composite layer.

10. The prefabricated beam-column connection node according to claim 1, characterized in that: An anchor plate is arranged at the end of the extended steel bar away from the connecting sleeve, and a 90° hook is arranged at the end of the steel strand away from the connecting sleeve.

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