Joint connecting structure of fabricated building and construction method of joint connecting structure

Abstract

The invention provides a node connecting structure of a fabricated building and a construction method of the node connecting structure, and relates to connecting nodes for splicing prefabricated concrete columns with foundation column piers, ground beams, interlayer beams, top beams and columns. Beam column connecting joints connected with the ground beams are located at the position 0.6-1 m below the ground layer, and inter-column connecting joints are located at the position 0.9-1.2 m above the elevation of the middle axis of the interlayer beams. Each node adopts a built-in box-type steel pipe or a steel tenon-and-mortise component and is fixed through tenon-and-mortise matching of a steel tenon and a steel mortise groove and a high-strength bolt, so that rapid and accurate assembly of the beam column or between the columns is realized; and after connection is completed, a formwork is erected in a node area, high-strength concrete is cast in place, and a steel reinforced concrete stress component is formed. And the shear bearing capacity, the integrity and the anti-seismic property of the joint are obviously improved. Meanwhile, components are prefabricated in a factory and assembled in a dry mode on site, construction is convenient and fast, quality is controllable, and the structure is suitable for assembly type buildings with high-rise and high-seismic fortification requirements.

Description

Technical Field

[0001] This invention relates to the field of prefabricated buildings, and more specifically to a node connection structure for prefabricated buildings and its construction method. Background Technology

[0002] With the deepening development of industrialized construction and green building concepts, prefabricated concrete structures have been widely used in residential, public, and industrial buildings due to their advantages such as fast construction speed, less on-site wet work, and controllable quality. However, the key to prefabricated structures lies in the reliability and integrity of their connection nodes, especially the load-bearing performance of beam-column joints and column-column splicing joints, which directly determines the safety, ductility, and seismic resistance of the entire structural system.

[0003] Currently, prefabricated beam-column joints generally adopt either grouted sleeve connections or on-site welding connections. While grouted sleeve connections are convenient for factory prefabrication, in actual engineering projects, improper grouting operations, poor grout fluidity, or inadequate venting often lead to incomplete grouting, internal voids, or defects, severely affecting the load-bearing capacity and durability of the joint. On the other hand, while welding connections can provide strong rigid connections, on-site welding involves a large amount of work, requires high standards for the construction environment and worker skills, and is inefficient. Furthermore, high-temperature welding can easily cause residual stress and material property degradation, which is detrimental to the long-term service life of the structure.

[0004] In addition, some prefabricated structures have attempted to use pure concrete mortise and tenon joints, which simplifies the construction, but have low shear bearing capacity, poor ductility, and weak energy dissipation capacity, making it difficult to meet the requirements of high-rise buildings or high-intensity earthquake zones for structural ductility and energy dissipation performance.

[0005] In the vertical splicing of prefabricated concrete columns, existing technologies mostly rely on grouting connections with steel sleeves or mechanical connections followed by concrete pouring. These methods generally suffer from problems such as insufficient integrity of the connection area, discontinuous force transmission paths, complex construction procedures, and difficulty in quality control. In particular, under seismic loading, they are prone to weak connections, slippage, or even brittle failure, making it difficult to meet the high seismic performance requirements of modern buildings.

[0006] In summary, existing prefabricated beam-column and column-column connection nodes still have significant shortcomings in terms of connection reliability, construction efficiency, structural integrity, and seismic performance. There is an urgent need for a new type of node connection structure that combines high strength, high ductility, convenient construction, controllable quality, and the ability to achieve steel-concrete synergistic stress distribution, so as to promote the development of prefabricated buildings towards higher safety and wider applicability. Summary of the Invention

[0007] The main objective of this invention is to provide a node connection structure for prefabricated buildings and its construction method, thereby solving the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a beam-column connection node for connecting precast concrete beams on precast concrete columns, and an inter-column connection node is also provided in the precast concrete column for connecting two precast concrete columns. The end of the box-shaped steel pipe in the beam-column connection node is embedded in the precast concrete column. A steel mortise is fixed on the side of the box-shaped steel pipe opposite to the precast concrete beam. A steel tenon is fixed on the end of the precast concrete beam. The steel tenon is inserted into the steel mortise for tenon-tenon connection and fixed by multiple bolts. The precast concrete beams include ground beams, inter-story beams, and top beams. The upper end of the box-shaped steel pipe in the beam-column connection node connected to the ground beam is embedded in the precast concrete column, and the lower end is inserted into the box-shaped steel pipe of the pier column embedded in the foundation column. The two ends of the box-shaped steel pipe in the beam-column connection node connected to the inter-story beam are embedded in the precast concrete column. The lower end of the box-shaped steel pipe in the beam-column connection node connected to the top beam is embedded in the precast concrete column, and the upper end is fixed with a steel plate for connecting and installing small roof columns. In the column connection node, the tenon and mortise components are pre-embedded at opposite ends of the connection between the two precast concrete columns. The tenon is inserted into the mortise component for tenon-mortise connection and is fixed by multiple bolts that are interlaced.

[0009] Preferably, one end of the steel tenon is an I-beam structure including an upper flange plate, a lower flange plate, and a web plate connecting the two. It is welded and fixed to the longitudinal reinforcement of the precast concrete beam and integrally cast into the concrete. The other end extends out of the precast concrete beam end and is a T-shaped structure including an upper flange plate and a web plate. Its web plate is inserted into the steel mortise, and the upper flange plate is welded and fixed against the steel mortise.

[0010] Preferably, the steel mortise is a U-shaped structure including two webs on the left and right sides and a lower flange plate connecting the two. Its ends are welded to the side wall of the box-shaped steel pipe. The web of the steel tenon is inserted between the two webs in the steel mortise, and the upper flange plate of the steel tenon is welded and fixed against the two webs in the steel mortise. The web of the steel tenon and the left and right webs of the steel mortise are provided with multiple corresponding through slots, and the steel tenon and the steel mortise are fixedly connected by inserting multiple bolts into the through slots.

[0011] Preferably, the bottom of the web of the steel tenon and the top of the left and right webs of the steel mortise are provided with grouting grooves for later sealing of the flow of cast-in-place concrete at the beam-column connection joint.

[0012] Preferably, a pier column box-shaped steel pipe is pre-embedded on the foundation column pier at the position corresponding to each precast concrete column. The lower half of the pier column box-shaped steel pipe is pre-embedded on the foundation column pier and welded and fixed to its longitudinal reinforcement in a single casting. A first positioning steel plate is fixed in the middle of the box-shaped steel pipe in the beam-column connection node connected to the ground beam, and a reinforcing rib is fixed between the upper periphery of the first positioning steel plate and the box-shaped steel pipe; The lower end of the box-shaped steel pipe is inserted into the pier column box-shaped steel pipe. The first positioning steel plate abuts against the pier column box-shaped steel pipe and is welded and fixed. The pier column box-shaped steel pipe and the box-shaped steel pipe are provided with multiple corresponding through grooves on their periphery. The pier column box-shaped steel pipe and the box-shaped steel pipe are fixedly connected by inserting multiple bolts into the through grooves.

[0013] Preferably, the upper half of the box-shaped steel pipe is pre-embedded at the end of the precast concrete column and welded and fixed to it as a whole for casting. A grouting pipe and an exhaust pipe are pre-embedded between the outside of the precast concrete column and the inside of the box-shaped steel pipe. Concrete is poured into the box-shaped steel pipe and the pier column box-shaped steel pipe through the grouting pipe. A grouting groove is provided on the lower periphery of the box-shaped steel pipe for the flow of the poured concrete.

[0014] Preferably, the box-shaped steel pipe in the beam-column connection node connected to the inter-story beam has longitudinal reinforcement bars of precast concrete columns welded to both ends of the periphery. By installing filling blocks on the periphery of the middle part of the box-shaped steel pipe, the box-shaped steel pipe and the precast concrete column are integrally cast and formed. The lower half of the box-shaped steel pipe in the beam-column connection node connected to the top beam is welded with the longitudinal reinforcement of the precast concrete column, and is cast integrally with the precast concrete column.

[0015] Preferably, a second positioning steel plate is fixed in the middle of the tenon member, and a reinforcing rib is fixed between the upper periphery of the second positioning steel plate and the tenon member. The longitudinal reinforcement in the precast concrete column is welded to the reinforcing rib and the tenon member, and is integrally cast with the precast concrete column. The lower half of the mortise groove component is embedded in the precast concrete column and welded and fixed to it with the longitudinal reinforcement, forming a single casting. The mortise and tenon components are square structures. The tenon component is inserted into the mortise component, and the second positioning steel plate abuts against the tenon component and is welded and fixed. The mortise and tenon components have multiple corresponding through slots on their periphery, and the mortise and tenon components are fixedly connected by bolts inserted into the through slots.

[0016] Preferably, a grouting pipe and an exhaust pipe are pre-embedded between the exterior of the precast concrete column and the interior of the tenon component. Concrete is poured into the mortise component and the tenon component through the grouting pipe. A grouting groove is provided on the periphery of the end of the tenon component for the flow of the poured concrete.

[0017] A construction method for a node connection structure in prefabricated buildings, comprising the following steps: S1. According to the design, the column connection nodes and beam-column connection nodes are processed in the factory, and the pier box steel pipes are pre-embedded at the corresponding positions of the precast concrete columns during the on-site construction of the foundation column piers. S2. Weld and fix the embedded components in the column connection nodes and beam-column connection nodes to the longitudinal reinforcement in the precast concrete columns and cast them together. S3. During installation, the lower precast concrete column is hoisted so that the box-shaped steel pipe at its lower end is inserted into the box-shaped steel pipe of the pier column on the foundation column, and fixed by welding and bolt locking. The ground beam is hoisted so that the steel tenon at its end is inserted into the steel mortise on the box-shaped steel pipe in the beam-column connection node connected to the ground beam, and the tenon and tenon connection is made and fixed by welding and bolt locking. The inter-story beams are hoisted so that the steel tenons at their ends are inserted into the steel mortises on the box-shaped steel pipes in the beam-column connection nodes connected to the inter-story beams, and are fixed by welding and bolting. The upper precast concrete column is hoisted so that the tenon component at its lower end is inserted into the mortise component at the upper end of the lower precast concrete column, and then fixed by welding and bolting. The top beam is hoisted so that the steel tenon at its end is inserted into the steel mortise on the box-shaped steel pipe in the beam-column connection node connected to the top beam, and the tenon and tenon connection is made and fixed by welding and bolt locking. S4. After the beam and column frame of the house is built, high-strength concrete is poured in place through grouting pipes at the column connection nodes. After grouting, steel-concrete composite load-bearing members are formed between the columns. Formwork is erected for the exposed areas of the steel components at each beam-column connection node, high-strength concrete is poured in place, and after grouting, steel-concrete composite load-bearing components are formed between the columns and beams. Each connection node is sealed and maintained to form a node protection layer.

[0018] This invention provides a node connection structure for prefabricated buildings and its construction method, with the following advantages: 1. Improve shear capacity and ductility: By using a steel-concrete composite working method, high-strength concrete is cast in place at each key node to form steel-concrete composite load-bearing members, which effectively improves the shear capacity and ductility of the entire building frame.

[0019] 2. To enhance the reliability of steel structure connections, the use of mortise and tenon joints and through bolts not only strengthens the connections between precast concrete columns, foundation piers, ground beams, inter-story beams, and top beams, but also improves the overall structural stability. The use of high-strength bolts further ensures the robustness and durability of the connections.

[0020] 3. Simplify on-site construction processes and improve efficiency. Modular prefabrication and installation allow most of the complex and time-consuming concrete prefabrication work to be completed in the factory. On-site work only requires hoisting and simple assembly operations, which greatly improves on-site construction efficiency and shortens the construction cycle.

[0021] 4. Easy to control quality: Most components are produced in a factory environment, which allows for better control of quality and precision and reduces uncertainties caused by changes in on-site construction conditions. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a front view of the overall structure of the present invention; Figure 2 This is the present invention. Figure 1 Exploded perspective view; Figure 3 This is a connection view of the beam-column connection node of the ground beam of the present invention; Figure 4 This is the present invention. Figure 3 An exploded axonometric view; Figure 5 This is an exploded axonometric view of the beam-column connection node of the inter-layer beam of the present invention; Figure 6 This is an exploded axonometric view of the beam-column connection node of the top beam of the present invention; Figure 7 This is a connection view of the inter-column connection node of the present invention; Figure 8 This is an exploded axonometric view of the inter-column connection node of the present invention; In the diagram: 1. Foundation column pier; 101. Box-type steel pipe for pier column; 2. Precast concrete column; 3. Beam-column connection node; 4. Inter-column connection node; 5. Precast concrete beam; 501. Ground beam; 502. Inter-story beam; 503. Top beam; 6. Box-type steel pipe; 7. Steel mortise; 8. Steel tenon; 9. First positioning steel plate; 10. Mortise component; 11. Tenon component; 11. Second positioning steel plate; 1101. Reinforcing rib; 1102. Steel plate; 12. Detailed Implementation

[0023] Example 1 like Figures 1-8 As shown, a node connection structure for a prefabricated building includes a connection node between a precast concrete column 2 and a foundation column pier 1, a connection node between a precast concrete column 2 and a ground beam 501, an inter-story beam 502 and a top beam 503, and a connection node between precast concrete columns 2.

[0024] At the location where the precast concrete column 2 is to be installed during the construction of the foundation column pier 1, a box-shaped steel pipe 101 is pre-embedded. The lower end of the box-shaped steel pipe 6 in the beam-column connection node 3 at this location is inserted into the box-shaped steel pipe 101 and fixed by through bolts. The upper end of the box-shaped steel pipe 6 is pre-embedded in the precast concrete column 2 and integrally cast. Steel mortises 7 are welded and fixed to the periphery of the box-shaped steel pipe 6 at the corresponding position of the ground beam 501. The steel tenons 8 pre-embedded at the end of the ground beam 501 are inserted into the steel mortises 7 for tenon-and-mortise connection and fixed by through bolts. This achieves a fixed steel structure connection between the precast concrete column 2, the foundation column pier 1, and the ground beam 501. After the overall building frame steel structure is fixed, formwork needs to be erected at the connection node, and high-strength concrete needs to be poured in place to form a steel-concrete composite load-bearing member at the node. The beam-column connection node 3 connected to the ground beam 501 is located 0.6~1m below the ground level.

[0025] During the installation of the inter-story beam 502, a beam-column connection node 3 is pre-embedded in the precast concrete column 2. The two ends of the box-shaped steel pipe 6 in the beam-column connection node 3 are pre-embedded in the precast concrete column 2 and integrally cast. The periphery of the box-shaped steel pipe 6 is welded and fixed with steel mortise grooves 7 at the corresponding positions of the inter-story beam 502. The steel tenon 8 pre-embedded at the end of the inter-story beam 502 is inserted into the steel mortise groove 7 for tenon-and-mortise connection and is fixed by through bolts. Thus, the steel structure of the inter-story beam 502 and the precast concrete column 2 are fixedly connected. After the overall building frame steel structure is fixed, it is necessary to support the formwork at the connection node and pour high-strength concrete in place to form a steel-concrete composite load-bearing member at the node.

[0026] During the installation of the top beam 503, a beam-column connection node 3 is pre-embedded at the end of the precast concrete column 2. The lower end of the box-shaped steel pipe 6 in the beam-column connection node 3 is pre-embedded in the precast concrete column 2 and integrally cast. A steel plate 12 is welded and fixed inside the upper end of the box-shaped steel pipe 6, which is used to connect and install the small roof column. The bottom of the small column is welded and fixed to the steel plate 12. Steel mortises 7 are welded and fixed to the corresponding positions of the box-shaped steel pipe 6 and the top beam 503. The steel tenon 8 pre-embedded at the end of the top beam 503 is inserted into the steel mortises 7 for tenon-and-mortise connection and is fixed by through bolts. Thus, the steel structure of the top beam 503 and the precast concrete column 2 are fixedly connected. After the overall building frame steel structure is fixed, it is necessary to support the formwork at the connection node and pour high-strength concrete in place to form a steel-concrete composite load-bearing member at the node.

[0027] The precast concrete column 2 is divided into multiple precast structures according to the building's floor height. The upper and lower columns are connected by inter-column connection nodes 4. Tenon members 11 and mortise members 10 are pre-embedded at opposite ends of the connection. The tenon member 11 at the upper column end is inserted into the mortise member 10 at the lower column end for a tenon-and-mortise connection, and then fixed by through bolts. This achieves the connection and fixation between the precast concrete columns 2. After the overall building frame steel structure is fixed, formwork needs to be erected at the connection nodes, and high-strength concrete needs to be poured in place to form steel-concrete composite load-bearing members at the nodes. The inter-column connection node 4 is located 0.9~1.2m above the central axis elevation of the inter-floor beam.

[0028] Preferably, the steel tenon 8 pre-embedded at the end of the precast concrete beam 5 is an I-beam structure at one end of the precast concrete beam 5, including an upper flange plate, a lower flange plate, and a web plate connecting the two. It is welded and fixed to the longitudinal reinforcement inside the precast concrete beam 5 and integrally cast into the concrete. The other end extends out of the end of the precast concrete beam 5 and is a T-shaped structure including an upper flange plate and a web plate. The steel mortise 7 on the periphery of the box-shaped steel pipe 6 in the beam-column connection node 3 is a U-shaped structure, including two web plates on the left and right sides and a lower flange plate connecting the two. Its end is welded to the side wall of the box-shaped steel pipe 6. The web plate in the steel tenon 8 is inserted between the two web plates in the steel mortise 7. The upper flange plate in the steel tenon 8 abuts against the two web plates in the steel mortise 7 and is welded and fixed. There are multiple corresponding through slots in the web plate in the steel tenon 8 and the two web plates in the steel mortise 7. The steel tenon 8 and the steel mortise 7 are fixedly connected by multiple bolts inserted into the through slots.

[0029] In a further preferred embodiment, a grouting groove is provided at the bottom of the web of the steel tenon 8 and at the top of the left and right webs of the steel mortise 7, for the flow of concrete to be poured in place and sealed at the beam-column connection node 3 in the later stage.

[0030] Preferably, the lower half of the pier column box-shaped steel pipe 101 is pre-embedded on the foundation column pier 1 and is welded and fixed to it with the longitudinal reinforcement and cast in one piece; the box-shaped steel pipe 6 in the beam-column connection node 3 connected to the ground beam 501 is welded and fixed in the middle with a first positioning steel plate 9, and a reinforcing rib is welded and fixed between the upper periphery of the first positioning steel plate 9 and the box-shaped steel pipe 6 for connecting and reinforcing the first positioning steel plate 9. The lower end of the box-shaped steel pipe 6 is inserted into the pier column box-shaped steel pipe 101. The first positioning steel plate 9 abuts against the pier column box-shaped steel pipe 101 and is welded and fixed. The pier column box-shaped steel pipe 101 and the box-shaped steel pipe 6 have multiple corresponding through grooves on their periphery. The pier column box-shaped steel pipe 101 and the box-shaped steel pipe 6 are fixedly connected by inserting multiple bolts into the through grooves.

[0031] The upper half of the box-shaped steel pipe 6 is pre-embedded at the end of the precast concrete column 2 and welded and fixed to it as a whole by casting. A grouting pipe and an exhaust pipe are pre-embedded between the outside of the precast concrete column 2 and the inside of the box-shaped steel pipe 6. Concrete is poured into the box-shaped steel pipe 6 and the pier column box-shaped steel pipe 101 through the grouting pipe. A grouting groove is provided on the lower periphery of the box-shaped steel pipe 6. There is a large gap between the box-shaped steel pipe 6 and the pier column box-shaped steel pipe 101 to facilitate the installation and adjustment of the verticality between the precast concrete column 2 and the pier column box-shaped steel pipe 101. After its steel structure is locked, high-strength concrete is poured into the gap to form a steel-concrete composite load-bearing member.

[0032] The box-shaped steel pipe 6 in the beam-column connection node 3 connected to the inter-story beam has longitudinal reinforcement bars of precast concrete column 2 welded to both ends of its periphery. By installing a filling block on the periphery of the middle of the box-shaped steel pipe 6, the box-shaped steel pipe 6 and the precast concrete column 2 are integrally cast. The filling block can fill the empty area in the casting mold, and only the two ends of the box-shaped steel pipe 6 are integrally cast with the precast concrete column 2. After the casting and curing are completed, the filling block can be removed to expose the middle of the box-shaped steel pipe 6 for welding and fixing the steel mortise groove 7.

[0033] The lower half of the box-shaped steel pipe 6 in the beam-column connection node 3 connected to the top beam is welded with the longitudinal reinforcement of the precast concrete column 2, and is integrally cast with the precast concrete column 2.

[0034] A second positioning steel plate 1101 is welded and fixed to the middle of the tenon component 11. A reinforcing rib 1102 is welded and fixed between the upper periphery of the second positioning steel plate 1101 and the tenon component 11. The longitudinal reinforcement in the precast concrete column 2 is welded to the reinforcing rib 1102 and the tenon component 11 on both sides and is cast integrally with the precast concrete column 2. The lower half of the mortise component 10 is embedded in the precast concrete column 2 and is welded and fixed to it with the longitudinal reinforcement and cast integrally. The mortise member 10 and the tenon member 11 are square structures. The tenon member 11 is inserted into the mortise member 10. The second positioning steel plate 1101 abuts against the tenon member 11 and is welded and fixed. The mortise member 10 and the tenon member 11 have multiple corresponding through slots on their periphery. The mortise member 10 and the tenon member 11 are fixedly connected by bolts inserted into the through slots.

[0035] A grouting pipe and an venting pipe are pre-embedded between the exterior of the precast concrete column 2 and the interior of the tenon member 11. Concrete is poured into the mortise member 10 and the tenon member 11 through the grouting pipe. A grouting groove is provided on the periphery of the end of the tenon member 11 for the flow of the poured concrete. There is a large gap between the tenon member 11 and the mortise member 10, which facilitates the installation and adjustment of the verticality between the upper and lower columns of the precast concrete column 2. After its steel structure is locked, high-strength concrete is poured into the gap to form a steel-concrete composite load-bearing member.

[0036] The aforementioned connection nodes work together with the steel-concrete composite structure to improve shear capacity and ductility; the steel structures are fixed together with high-strength shear bolts, ensuring reliable fixation and long service life; the prefabricated modular installation of the prefabricated building system results in high on-site construction efficiency and easy quality control.

[0037] Example 2 like Figures 1-8 As shown in Example 1, a construction method for a node connection structure in a prefabricated building is further illustrated, and the method steps are as follows: S1. According to the design, the column connection node 4 and each beam-column connection node 3 are processed in the factory. When constructing the foundation column pier 1 on site, the corresponding position of the precast concrete column 2 is pre-embedded with the pier column box steel pipe 101. S2. Weld and fix the embedded parts in the column connection node 4 and each beam-column connection node 3 to the longitudinal reinforcement in the precast concrete column 2 and cast them together. S3. During installation, the lower precast concrete column 2 is hoisted so that the box-shaped steel pipe 6 at its lower end is inserted into the pier box-shaped steel pipe 101 on the foundation column pier 1, and fixed by welding and bolt locking. The ground beam 501 is hoisted so that the steel tenon 8 at its end is inserted into the steel mortise 7 on the box-shaped steel pipe 6 in the beam-column connection node 3 connected to the ground beam 501, and the tenon and tenon connection is made, and the beam is fixed by welding and bolt locking. The inter-story beam 502 is hoisted so that the steel tenon 8 at its end is inserted into the steel mortise 7 on the box-shaped steel pipe 6 in the beam-column connection node 3 connected to the inter-story beam 502, and the tenon and tenon connection is made, and the beam is fixed by welding and bolt locking. The upper precast concrete column 2 is hoisted so that the tenon member 11 at its lower end is inserted into the mortise member 10 at the upper end of the lower precast concrete column 2, and fixed by welding and bolt locking. The top beam 503 is hoisted so that the steel tenon 8 at its end is inserted into the steel mortise 7 on the box-shaped steel pipe 6 in the beam-column connection node 3 connected to the top beam 503, and the tenon and tenon connection is made, and the beam is fixed by welding and bolt locking. S4. After the beam and column frame of the house is built, high-strength concrete is poured in place through the grouting pipe at the column connection node 4. After grouting, steel-concrete composite members are formed between the columns. Formwork is erected for the exposed areas of the steel components at each beam-column connection node 3, and high-strength concrete is poured in place. After grouting, steel-concrete composite load-bearing components are formed between the columns and beams. Each connection node is sealed and maintained to form a node protection layer.

[0038] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A node connection structure for prefabricated buildings, characterized by: The precast concrete column (2) includes a beam-column connection node (3) that connects the precast concrete beam (5) to the precast concrete column (2). The precast concrete column (2) also has an inter-column connection node (4) for connecting two precast concrete columns (2). The end of the box-shaped steel pipe (6) in the beam-column connection node (3) is embedded in the precast concrete column (2). A steel mortise (7) is fixed on the side of the box-shaped steel pipe (6) opposite to the precast concrete beam (5). A steel tenon (8) is fixed at the end of the precast concrete beam (5). The steel tenon (8) is inserted into the steel mortise (7) for tenon-tenon connection and fixed by multiple bolts. The precast concrete beam (5) includes a ground beam (501), an inter-story beam (502), and a top beam (503). The upper end of the box-shaped steel pipe (6) in the beam-column connection node (3) connected to the ground beam (501) is embedded in the precast concrete column (2), and the lower end is inserted into the pier column box-shaped steel pipe (101) embedded on the foundation column pier (1). The two ends of the box-shaped steel pipe (6) in the beam-column connection node (3) connected to the inter-story beam (502) are embedded in the precast concrete column (2). The lower end of the box-shaped steel pipe (6) in the beam-column connection node (3) connected to the top beam (503) is embedded in the precast concrete column (2), and the upper end is fixed with a steel plate (12) for connecting and installing small roof columns. The tenon component (11) and the mortise component (10) in the column connection node (4) are respectively embedded in the opposite end of the connection between the two precast concrete columns (2). The tenon component (11) is inserted into the mortise component (10) for tenon and mortise connection, and is fixed by multiple bolts that are intersected and inserted.

2. The node connection structure of a prefabricated building according to claim 1, characterized in that: One end of the steel tenon (8) is an I-beam structure including an upper flange plate, a lower flange plate and a web plate connecting the two. It is welded and fixed to the longitudinal reinforcement of the precast concrete beam (5) and cast integrally into the concrete. The other end extends out of the precast concrete beam (5) and is a T-shaped structure including an upper flange plate and a web plate. Its web plate is inserted into the steel mortise (7), and the upper flange plate is welded and fixed against the steel mortise (7).

3. The node connection structure of a prefabricated building according to claim 2, characterized in that: The steel mortise (7) is a U-shaped structure including two webs on the left and right and a lower flange plate connecting the two. Its end is welded to the side wall of the box-shaped steel pipe (6). The web of the steel tenon (8) is inserted between the two webs on the left and right in the steel mortise (7). The upper flange plate of the steel tenon (8) is welded and fixed against the two webs on the left and right in the steel mortise (7). The web of the steel tenon (8) and the left and right webs of the steel mortise (7) are provided with multiple corresponding through slots, and the steel tenon (8) and the steel mortise (7) are fixedly connected by inserting multiple bolts into the through slots.

4. The node connection structure of a prefabricated building according to claim 3, characterized in that: The bottom of the web of the steel tenon (8) and the top of the left and right webs of the steel mortise (7) are provided with grouting grooves for later sealing of the cast-in-place concrete flow at the beam-column connection node (3).

5. The node connection structure of a prefabricated building according to claim 1, characterized in that: in The foundation column pier (1) is pre-embedded with a pier column box-shaped steel pipe (101) corresponding to each precast concrete column (2). The lower half of the pier column box-shaped steel pipe (101) is pre-embedded on the foundation column pier (1) and welded and fixed with its longitudinal reinforcement to form a whole. A first positioning steel plate (9) is fixed in the middle of the box-shaped steel pipe (6) in the beam-column connection node (3) connected to the ground beam (501), and a reinforcing rib is fixed between the upper periphery of the first positioning steel plate (9) and the box-shaped steel pipe (6); The lower end of the box-shaped steel pipe (6) is inserted into the pier box-shaped steel pipe (101). The first positioning steel plate (9) abuts against the pier box-shaped steel pipe (101) and is welded and fixed. The pier box-shaped steel pipe (101) and the box-shaped steel pipe (6) are provided with multiple corresponding through grooves on their periphery. The pier box-shaped steel pipe (101) and the box-shaped steel pipe (6) are fixedly connected by inserting multiple bolts into the through grooves.

6. The node connection structure of a prefabricated building according to claim 5, characterized in that: The upper half of the box-shaped steel pipe (6) is embedded in the end of the precast concrete column (2) and welded and fixed to it as a whole. A grouting pipe and an exhaust pipe are embedded between the outside of the precast concrete column (2) and the inside of the box-shaped steel pipe (6). Concrete is poured into the box-shaped steel pipe (6) and the pier column box-shaped steel pipe (101) through the grouting pipe. A grouting groove is provided on the lower side of the box-shaped steel pipe (6) for the flow of the poured concrete.

7. The node connection structure of a prefabricated building according to claim 1, characterized in that: The box-shaped steel pipe (6) in the beam-column connection node (3) connected to the inter-story beam has longitudinal reinforcement of precast concrete column (2) welded to both sides. By installing filling blocks on the middle side of the box-shaped steel pipe (6), the box-shaped steel pipe (6) and the precast concrete column (2) are integrally cast. The lower half of the box-shaped steel pipe (6) in the beam-column connection node (3) connected to the top beam is welded with the longitudinal reinforcement of the precast concrete column (2), and is cast integrally with the precast concrete column (2).

8. The node connection structure of a prefabricated building according to claim 1, characterized in that: A second positioning steel plate (1101) is fixed in the middle of the tenon member (11), and a reinforcing rib (1102) is fixed between the upper periphery of the second positioning steel plate (1101) and the tenon member (11). The longitudinal reinforcement in the precast concrete column (2) is welded to the reinforcing rib (1102) and the tenon member (11), and is integrally cast with the precast concrete column (2). The lower half of the mortise and tenon component (10) is embedded in the precast concrete column (2) and welded and fixed with its longitudinal reinforcement to form a whole; The mortise member (10) and the tenon member (11) are square structures. The tenon member (11) is inserted into the mortise member (10). The second positioning steel plate (1101) abuts against the tenon member (11) and is welded and fixed. The mortise member (10) and the tenon member (11) are provided with multiple corresponding through slots on their periphery, and the mortise member (10) and the tenon member (11) are fixedly connected by bolts inserted into the through slots.

9. The node connection structure of a prefabricated building according to claim 8, characterized in that: A grouting pipe and an exhaust pipe are pre-embedded between the exterior of the precast concrete column (2) and the interior of the tenon component (11). Concrete is poured into the mortise component (10) and the tenon component (11) through the grouting pipe. A grouting groove is provided on the periphery of the end of the tenon component (11) for the flow of the poured concrete.

10. A construction method for a node connection structure of a prefabricated building according to any one of claims 1 to 9, wherein the method steps are as follows: S1. According to the design, the column connection nodes (4) and each beam-column connection node (3) are processed in the factory. When constructing the foundation column pier (1) on site, the pier column box steel pipe (101) is pre-embedded at the position corresponding to the precast concrete column (2). S2. Weld and fix the embedded parts in the column connection node (4) and each beam-column connection node (3) to the longitudinal reinforcement in the precast concrete column (2) and cast them together. S3. During installation, the lower precast concrete column (2) is hoisted so that the box-shaped steel pipe (6) at its lower end is inserted into the pier box-shaped steel pipe (101) on the foundation column pier (1) and fixed by welding and bolt locking. The ground beam (501) is hoisted so that the steel tenon (8) at its end is inserted into the steel mortise (7) on the box-shaped steel pipe (6) in the beam-column connection node (3) connected to the ground beam (501) for tenon-tenon connection and fixed by welding and bolt locking. The inter-story beam (502) is hoisted so that the steel tenon (8) at its end is inserted into the steel mortise (7) on the box-shaped steel pipe (6) in the beam-column connection node (3) connected to the inter-story beam (502) for tenon-tenon connection and fixed by welding and bolt locking. The upper precast concrete column (2) is hoisted so that the tenon member (11) at its lower end is inserted into the mortise member (10) at the upper end of the lower precast concrete column (2) and fixed by welding and bolting. The top beam (503) is hoisted so that the steel tenon (8) at its end is inserted into the steel mortise (7) on the box-shaped steel pipe (6) in the beam-column connection node (3) connected to the top beam (503) for tenon-tenon connection and fixed by welding and bolt locking. S4. After the beam and column frame of the house is built, the column connection node (4) is filled with high-strength concrete through the grouting pipe. After grouting, a steel-concrete composite member is formed between the columns. Formwork is erected in the exposed areas of the steel components at each beam-column connection node (3), high-strength concrete is poured in place, and after grouting, steel-concrete composite members are formed between the columns and beams. Each connection node is sealed and maintained to form a node protection layer.

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