Concrete-filled steel tube structure tenon-and-mortise assembly type beam-column joint and construction method

Abstract

The invention provides a tenon-and-mortise assembly type beam-column joint of a concrete-filled steel tube structure and a construction method, and belongs to the technical field of assembly type composite structures. The problem of how to reinforce beam-column joint connection of the assembly type composite structure is solved. The joint outer mortise upper steel plate and the joint outer lower steel plate are tightly attached to the upper surface and the lower surface of the channel steel respectively and are connected in a welded mode, the upper steel plate of the H-shaped steel beam can be meshed with the joint outer mortise upper steel plate, and the channel steel is connected with the H-shaped steel beam in a matched mode. Mortise and tenon connection is applied to the assembly type composite structure, so that the assembly efficiency is effectively improved; a connection mode of combining mortise and tenon connection, bolt connection and welding is adopted, so that the connection strength and the integrality of the component are greatly improved; a plurality of layers of steel plates are adopted for thickening at the connecting position, so that the design requirement of'strong joint 'is met; the tensile steel plate is arranged in the square steel tube concrete, so that the restraining capacity of the square steel tube to the concrete is enhanced; the connection form of the node and the steel beam conforms to the stress characteristics of all parts of the steel beam.

Description

Technical Field

[0001] The invention belongs to the technical field of assembled composite structures, and particularly relates to a mortise and tenon assembled beam-column joint of a concrete-filled steel tube structure and a construction method thereof. Background Art

[0002] The assembled composite structure is one of the important development directions of building structures in China. It has advantages such as improving and ensuring project quality, enhancing production efficiency, reducing construction costs, and saving energy and protecting the environment, and has broad development space. The common connection methods of assembled composite structures have problems such as low assembly efficiency and difficult positioning, and often it is difficult to meet the design requirements of "strong joints and strong anchorage", and even become weak points of the structure. How to strengthen the beam-column joint connection of assembled composite structures has become a difficult problem to be solved urgently. Summary of the Invention

[0003] In view of this, the invention provides a mortise and tenon assembled beam-column joint of a concrete-filled steel tube structure and a construction method thereof. By applying mortise and tenon connection to the assembled composite structure, the assembly efficiency is effectively improved; the connection method combining mortise and tenon connection, bolt connection and welding is adopted to greatly enhance the connection strength and the integrity of components; the connection position is thickened with multiple layers of steel plates to achieve the design requirement of "strong joints"; tensile steel plates are embedded in the concrete-filled steel tube to enhance the restraint ability of the steel tube to the concrete; the connection form between the joint and the steel beam conforms to the stress characteristics of each part of the steel beam. The whole component does not require formwork and is simple to assemble, which can effectively improve the construction efficiency.

[0004] To achieve the above object, the invention adopts the following technical scheme: A mortise and tenon assembled beam-column joint of a concrete-filled steel tube structure, comprising an assembled joint and an H-shaped steel beam. The assembled joint includes an outer steel tube of the joint, two upper steel plates of the joint with mortise eyes, two channel steels and a lower steel plate of the joint. The two channel steels are closely attached to the surface of the outer steel tube of the joint and are welded and connected. The upper steel plates of the joint with mortise eyes and the lower steel plate of the joint are respectively closely attached to the upper and lower surfaces of the channel steels and are welded and connected. The upper steel plate of the H-shaped steel beam can be meshed with the upper steel plate of the joint with mortise eyes, and the web of the H-shaped steel beam is inserted into the gap between the two channel steels so that the H-shaped steel beam is connected in cooperation with the two channel steels.

[0005] Furthermore, the H-shaped steel beam includes an upper steel plate of the H-shaped steel beam with a tenon head, a web of the H-shaped steel beam and a lower steel plate of the H-shaped steel beam. The upper steel plate of the H-shaped steel beam with a tenon head and the lower steel plate of the H-shaped steel beam are respectively vertically connected to the web of the H-shaped steel beam. The front end of the upper steel plate of the H-shaped steel beam with a tenon head is designed with meshing convex teeth, the upper steel plate of the joint with mortise eyes is provided with meshing concave teeth, and the lower steel plate of the H-shaped steel beam is butted against the lower steel plate of the joint.

[0006] Furthermore, the upper steel plate of the H-shaped steel beam with tenons and the upper steel plate of the joint with mortises outside the node are mutually engaged and welded together. The channel steel is connected to the web of the H-shaped steel beam by bolts, and the lower steel plate outside the node is connected to the lower steel plate of the H-shaped steel beam by butt welds.

[0007] Furthermore, the prefabricated joint further includes an inner lining steel pipe, and the outer surface of the inner lining steel pipe is closely attached to the inner surface of the outer steel pipe of the node and welded together.

[0008] Furthermore, the concrete-filled steel tube includes a steel tube and the concrete located inside it, and the concrete is of a strength grade not lower than C30.

[0009] Furthermore, the steel tube is a square steel tube or a circular steel tube.

[0010] Furthermore, when the steel tube is a square steel tube, the prefabricated joint further includes an inner tensile steel plate and an inner arc-shaped plate of the node. The inner tensile steel plate of the node is perpendicularly welded to the outer steel tube of the node; the inner arc-shaped plate of the node is perpendicularly connected to the outer steel tube of the node and the inner tensile steel plate of the node.

[0011] Furthermore, the steel strength grades of the inner lining steel pipe, the inner tensile steel plate of the node, the inner arc-shaped plate of the node, the outer steel tube of the node, the upper steel plate with mortises outside the node, the channel steel, and the lower steel plate outside the node are not lower than Q355.

[0012] A construction method for applying a concrete-filled steel tube tenon and mortise prefabricated beam-column joint. When the steel tube is a square steel tube, it specifically includes the following steps:

[0013] Step 1: Fabricate the prefabricated joint: Fabricate a number of inner lining steel pipes, a number of inner tensile steel plates of the node, a number of inner arc-shaped plates of the node, a number of outer steel tubes of the node, a number of upper steel plates with mortises outside the node, a number of channel steels, and a number of lower steel plates outside the node according to the dimension design; weld the inner lining steel pipe, the inner tensile steel plate of the node, the inner arc-shaped plate of the node, the outer steel tube of the node, the upper steel plate with mortises outside the node, the channel steel, and the lower steel plate outside the node into a joint.

[0014] Step 2: Connect the joint with the square concrete-filled steel tube: Transport the prefabricated joint to the construction site, insert the inner lining steel pipe into the steel tube of the square concrete-filled steel tube by adjusting the angle, and perform welding connection at the inner lining steel pipe.

[0015] Step 3: Connect the joint with the steel beam: Adjust the angle of the H-shaped steel beam so that the upper steel plate of the H-shaped steel beam with tenons and the upper steel plate of the joint with mortises outside the node are mutually engaged and welded together. The channel steel is connected to the web of the H-shaped steel beam by bolts, and the lower steel plate outside the node is connected to the lower steel plate of the H-shaped steel beam by butt welds.

[0016] Step 4: Pour the concrete: Densely pour the concrete into the steel tube of the square concrete-filled steel tube until the concrete reaches the design strength.

[0017] A construction method for applying a concrete-filled steel tube tenon and mortise assembled beam-column joint. When the steel tube is a circular steel tube, the specific steps are as follows:

[0018] Step 1: Fabricate the assembled joint: Fabricate a number of inner steel tubes, a number of outer steel tubes of the joint, a number of upper steel plates of the joint with mortise eyes, a number of channel steels and a number of lower steel plates of the joint according to the dimension design; weld the inner steel tube, the outer steel tube of the joint, the upper steel plate of the joint with mortise eyes, the channel steel and the lower steel plate of the joint into a joint;

[0019] Step 2: Connect the joint to the concrete-filled circular steel tube: Transport the prefabricated joint to the construction site, insert the inner steel tube into the steel tube of the concrete-filled circular steel tube by adjusting the angle, and weld the connection at the inner steel tube;

[0020] Step 3: Connect the joint to the steel beam: Make the upper steel plate of the H-shaped steel beam with a tenon head and the upper steel plate of the joint with mortise eyes bite and weld together by adjusting the angle of the H-shaped steel beam, connect the channel steel and the web of the H-shaped steel beam with bolts, and connect the lower steel plate of the joint and the lower steel plate of the H-shaped steel beam with butt welds;

[0021] Step 4: Pour concrete: Densely pour concrete into the steel tube of the concrete-filled steel tube until the concrete reaches the design strength.

[0022] Compared with the prior art, the tenon and mortise assembled beam-column joint adopted in the present invention improves the connection method of the traditional assembled composite structure, strengthens the integrity of the joint and the concrete-filled steel tube, and the joint and the steel beam through reasonable structure, and improves the bonding performance of the core concrete and the joint by setting inner steel tubes and tensile steel plates. Generally speaking, the assembled joint has the following advantages:

[0023] (1) Apply tenon and mortise connection to the assembled composite structure, effectively improving the assembly efficiency. The assembled joint proposed in the present invention is connected to the concrete-filled steel tube by an inner steel tube, and the assembled joint and the steel beam are connected by a tenon and mortise on the upper flange - bolts on the middle web - flush connection on the lower flange, which can achieve rapid positioning and installation.

[0024] (2) The combination of tenon and mortise connection, bolt connection and welding greatly improves the connection strength and the integrity of the component. Compared with the traditional welding connection, the connection method proposed in the present invention greatly increases the weld length and improves the welding connection strength; compared with the traditional mechanical connection, the tenon and mortise connection gives full play to the material properties of the steel itself and can save additional connecting parts.

[0025] (3) The node position is thickened with multiple steel plates, meeting the design requirements of "strong nodes". Skillfully utilize the shape characteristics of the channel steel and the H-shaped steel to achieve the overlap and thickening of the channel steel and the H-shaped steel at the connection between the assembled joint and the steel beam, and use the inner steel tube to achieve double-layer steel plate thickening at the connection between the assembled joint and the concrete-filled steel tube.

[0026] (4) The mechanical properties of concrete-filled steel tubes are enhanced. The assembled joint has tensile steel plates built into the outer steel tube of the joint, which enhances the confinement ability of the concrete-filled steel tube to the middle part and effectively avoids the buckling instability of the steel tube wall; both the upper and lower tensile steel plates exceed the joint height, effectively ensuring the transfer of bending moment and shear force.

[0027] (5) The connection form between the joint and the steel beam conforms to the stress characteristics of each part of the steel beam. The upper flange of the H-shaped steel beam is mainly in tension, and the tenon-mortise connection and welding connection effectively ensure the transfer of tensile force; the web of the H-shaped steel beam is mainly in shear, and the bolt connection effectively ensures the transfer of shear force; the lower flange of the H-shaped steel beam is mainly in compression, and the butt weld connection effectively ensures the transfer of compressive force.

[0028] It is suitable for large-scale production and local maintenance and replacement. Due to its highly standardized and modular characteristics, the assembled joint can not only be mass-produced in the factory, improving the construction speed and ensuring the stability and consistency of product quality, but also can be quickly installed and disassembled for maintenance and replacement after local damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 is a three-dimensional internal structure schematic diagram of the tenon-mortise assembled beam-column joint of the square concrete-filled steel tube structure in Embodiment 1 of the present invention;

[0031] Figure 2 is a schematic diagram after the assembled joint and the H-shaped steel beam in Embodiment 1 are connected;

[0032] Figure 3 is a partial schematic diagram of the assembled joint and the H-shaped steel beam in Embodiment 1;

[0033] Figure 4 is a three-dimensional internal structure schematic diagram of the tenon-mortise assembled beam-column joint of the circular concrete-filled steel tube structure in Embodiment 2 of the present invention;

[0034] Figure 5 is a schematic diagram after the assembled joint and the H-shaped steel beam in Embodiment 2 are connected;

[0035] Figure 6 is a partial schematic diagram of the assembled joint and the H-shaped steel beam in Embodiment 2;

[0036] Description of the drawing reference numerals: 1 - Inner lining steel pipe; 2 - Inner tensile steel plate of the joint; 3 - Inner arc-shaped plate of the joint; 4 - Outer steel pipe of the joint; 5 - Upper steel plate with mortise holes outside the joint; 6 - Channel steel; 7 - Lower steel plate outside the joint; 8 - H-shaped steel beam; 8.1 - Upper steel plate with tenon of the H-shaped steel beam; 8.2 - Web of the H-shaped steel beam; 8.3 - Lower steel plate of the H-shaped steel beam; 9 - Steel pipe; 10 - Concrete. Specific implementation mode

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0038] Embodiment 1:

[0039] See Figures 1-3 To illustrate this embodiment, a tenon-mortise assembled beam-column joint of a concrete-filled square steel tube structure includes an assembled joint and an H-shaped steel beam 8. The assembled joint includes an outer steel pipe 4 of the joint, two upper steel plates 5 with mortise holes outside the joint, two channel steels 6, and a lower steel plate 7 outside the joint. The two channel steels 6 are closely attached to the surface of the outer steel pipe 4 of the joint and are welded. The upper steel plate 5 with mortise holes outside the joint and the lower steel plate 7 outside the joint are respectively closely attached to the upper and lower surfaces of the channel steel 6 and are welded. The upper steel plate of the H-shaped steel beam 8 can be meshed with the upper steel plate 5 with mortise holes outside the joint. The web of the H-shaped steel beam 8 is inserted into the gap between the two channel steels 6, so that the H-shaped steel beam 8 is connected in cooperation with the two channel steels 6.

[0040] The H-shaped steel beam 8 includes an upper steel plate 8.1 with a tenon of the H-shaped steel beam, a web 8.2 of the H-shaped steel beam, and a lower steel plate 8.3 of the H-shaped steel beam. The upper steel plate 8.1 with a tenon of the H-shaped steel beam and the lower steel plate 8.3 of the H-shaped steel beam are respectively vertically connected to the web 8.2 of the H-shaped steel beam. The front end of the upper steel plate 8.1 with a tenon of the H-shaped steel beam is designed with meshing convex teeth, and the upper steel plate 5 with mortise holes outside the joint is provided with meshing concave teeth. The lower steel plate 8.3 of the H-shaped steel beam is butted against the lower steel plate 7 outside the joint.

[0041] The tenon-mortise assembled beam-column joint of the concrete-filled square steel tube also includes an inner lining steel pipe 1, an inner tensile steel plate 2 of the joint, and an inner arc-shaped plate 3 of the joint. The outer surface of the inner lining steel pipe 1 is closely attached to the inner surface of the outer steel pipe 4 of the joint and is welded; the inner tensile steel plate 2 of the joint is vertically welded to the outer steel pipe 4 of the joint; the inner arc-shaped plate 3 of the joint is vertically connected to the outer steel pipe 4 of the joint and the inner tensile steel plate 2 of the joint.

[0042] The present invention designs an assembled joint. The structural joint is not only the intersection of the upper and lower frame columns, frame beams and floor slabs, but also the key point of the seismic fortification of the building structure. A composite structure is set at the joint to enhance the stiffness and bearing capacity of the joint.

[0043] The prefabricated joint is composed of an inner lining steel pipe 1, an inner tensile steel plate 2 of the joint, an inner arc-shaped plate 3 of the joint, an outer steel pipe 4 of the joint, an upper steel plate 5 with mortise holes outside the joint, a channel steel 6, and a lower steel plate 7 outside the joint.

[0044] The connection between the upper steel plate 5 with mortise holes outside the joint and the upper steel plate 8.1 with tenon heads of the H-shaped steel beam is an interlocking concave-convex shape, achieving the effect of tenon-mortise joint.

[0045] The steel strength grades of the inner lining steel pipe 1, the inner tensile steel plate 2 of the joint, the inner arc-shaped plate 3 of the joint, the outer steel pipe 4 of the joint, the upper steel plate 5 with mortise holes outside the joint, the channel steel 6, and the lower steel plate 7 outside the joint are not lower than Q355, and high-strength friction-type bolts are used. Considering the strength of the steel pipe 9 of the concrete-filled square steel tube, strength matching is achieved, so the strength is generally not lower than Q355.

[0046] The thicknesses of the inner lining steel pipe 1, the inner arc-shaped plate 3 of the joint, and the channel steel 6 are not less than 2 / 3 of the thickness of the steel pipe 9 of the concrete-filled square steel tube; the thicknesses of the inner tensile steel plate 2 of the joint, the outer steel pipe 4 of the joint, the upper steel plate 5 with mortise holes outside the joint, and the lower steel plate 7 outside the joint are the same as the thickness of the steel pipe 9 of the concrete-filled square steel tube. As the main force-transmitting components at the joint, the thicknesses of the inner lining steel pipe 1, the inner tensile steel plate 2 of the joint, the inner arc-shaped plate 3 of the joint, the outer steel pipe 4 of the joint, the upper steel plate 5 with mortise holes outside the joint, the channel steel 6, and the lower steel plate 7 outside the joint are directly related to the safety of the joint. First, the reliable connection of the steel pipes 9 of the concrete-filled square steel tube above and below the joint needs to be ensured. Considering the possible adverse working conditions of local tension and compression of the steel pipe 9 of the concrete-filled square steel tube, the thicknesses of the inner lining steel pipe 1, the inner arc-shaped plate 3 of the joint, and the channel steel 6 are increased to 2 / 3 of the thickness of the steel pipe 9 of the concrete-filled square steel tube, and the thicknesses of the inner tensile steel plate 2 of the joint, the upper steel plate 5 with mortise holes outside the joint, and the lower steel plate 7 outside the joint are increased to be the same as the thickness of the steel pipe 9 of the concrete-filled square steel tube, fully ensuring the force-bearing capacity, seismic performance, and supporting role during construction of the joint.

[0047] By setting the welding of the inner lining steel pipe 1, the reliable connection between the joint and the concrete-filled square steel tube is achieved; at the same time, the bonding performance between the core concrete and the joint is improved, and the effective transfer of shear force at the joint is realized.

[0048] The height of the inner lining steel pipe 1 is not less than 10 times the thickness of the steel pipe 9 of the concrete-filled square steel tube.

[0049] The extension length of the joint at the position of the H-shaped steel beam 8 is not less than the anchorage length of the reinforced concrete structure.

[0050] The concrete-filled square steel tube includes a steel pipe 9 and the concrete 10 located inside it, and the steel pipe 9 is a square steel pipe. The concrete 10 is internal-curing concrete with a strength grade not lower than C30.

[0051] By applying tenon - mortise connections to prefabricated composite structures, the present invention effectively improves the assembly efficiency. By adopting a connection method combining tenon - mortise connections, bolt connections and welding, the connection strength and the integrity of components are significantly improved. By thickening multiple layers of steel plates at the connection positions, the design requirement of "strong joints" is achieved. By installing tensile steel plates in concrete - filled square steel tubes, the confinement capacity of the square steel tubes to concrete is enhanced. The connection form between the joints and the steel beams conforms to the stress characteristics of each part of the steel beams. The whole component does not require formwork and is simple to assemble, which can effectively improve the construction efficiency.

[0052] The tenon - mortise assembled beam - column joint of concrete - filled square steel tube structure and its construction method specifically include the following construction steps:

[0053] (1) Fabricate the joint: Fabricate a number of inner steel tubes 1, a number of inner tensile steel plates 2 in the joint, a number of inner arc - shaped plates 3, a number of outer steel tubes 4, a number of upper steel plates 5 with mortise holes outside the joint, a number of channel steels 6 and a number of lower steel plates 7 outside the joint according to the dimension design; weld the inner steel tube 1, the inner tensile steel plate 2 in the joint, the inner arc - shaped plate 3, the outer steel tube 4, the upper steel plate 5 with mortise holes outside the joint, the channel steel 6 and the lower steel plate 7 outside the joint into a joint;

[0054] (2) Connect the joint with the concrete - filled square steel tube: Transport the prefabricated joint to the construction site, insert the inner steel tube 1 into the steel tube 9 of the concrete - filled square steel tube by adjusting the angle, and weld the connection at the inner steel tube 1;

[0055] (3) Connect the joint with the steel beam: Make the tenon - head upper steel plate 8.1 of the H - shaped steel beam and the upper steel plate 5 with mortise holes outside the joint bite and weld together by adjusting the angle of the steel beam, connect the channel steel 6 and the web 8.2 of the H - shaped steel beam with bolts, and connect the lower steel plate 7 outside the joint and the lower steel plate 8.3 of the H - shaped steel beam with butt welds;

[0056] (4) Pour concrete: Densely pour concrete 10 into the steel tube 9 of the concrete - filled square steel tube until the concrete 10 reaches the design strength.

[0057] The tenon - mortise assembled beam - column joint adopted by the present invention improves the connection method of the traditional prefabricated composite structure. The joint is composed of an inner steel tube 1, an inner tensile steel plate 2 in the joint, an inner arc - shaped plate 3, an outer steel tube 4, an upper steel plate 5 with mortise holes outside the joint, a channel steel 6 and a lower steel plate 7 outside the joint, and has good mechanical properties. By applying tenon - mortise connections to prefabricated composite structures, the assembly efficiency is effectively improved. By adopting a connection method combining tenon - mortise connections, bolt connections and welding, the connection strength and the integrity of components are significantly improved. By thickening multiple layers of steel plates at the connection positions, the design requirement of "strong joints" is achieved. By installing tensile steel plates in concrete - filled square steel tubes, the confinement capacity of the square steel tubes to concrete is enhanced. The connection form between the joints and the steel beams conforms to the stress characteristics of each part of the steel beams. The whole component does not require formwork and is simple to assemble, which can effectively improve the construction efficiency.

[0058] Embodiment 2:

[0059] Referring to Figures 4-6 This embodiment will be described. A tenon-mortise assembled beam-column joint of a concrete-filled circular steel tube structure includes an assembled joint and an H-shaped steel beam 8. The assembled joint includes an outer joint steel tube 4, two upper outer joint steel plates 5 with mortise eyes, two channel steels 6, and an outer joint lower steel plate 7. The two channel steels 6 are closely attached to the surface of the outer joint steel tube 4 and are welded together. The upper outer joint steel plate 5 with mortise eyes and the outer joint lower steel plate 7 are respectively closely attached to the upper and lower surfaces of the channel steel 6 and are welded together. The upper steel plate of the H-shaped steel beam 8 can be meshed with the upper outer joint steel plate 5 with mortise eyes. The web of the H-shaped steel beam 8 is inserted into the gap between the two channel steels 6, so that the H-shaped steel beam 8 is cooperatively connected with the two channel steels 6.

[0060] The H-shaped steel beam 8 includes an H-shaped steel beam upper steel plate with a tenon head 8.1, an H-shaped steel beam web 8.2, and an H-shaped steel beam lower steel plate 8.3. The H-shaped steel beam upper steel plate with a tenon head 8.1 and the H-shaped steel beam lower steel plate 8.3 are respectively vertically connected to the H-shaped steel beam web 8.2. The front end of the H-shaped steel beam upper steel plate with a tenon head 8.1 is designed with meshing convex teeth. The upper outer joint steel plate 5 with mortise eyes is provided with meshing concave teeth. The H-shaped steel beam lower steel plate 8.3 is butted against the outer joint lower steel plate 7.

[0061] The concrete-filled circular steel tube tenon-mortise assembled beam-column joint further includes an inner lining steel tube 1. The outer surface of the inner lining steel tube 1 is closely attached to the inner surface of the outer joint steel tube 4 and is welded together.

[0062] The core inventive concept of the tenon-mortise assembled beam-column joint of the concrete-filled circular steel tube structure is the same as that of the tenon-mortise assembled beam-column joint of the concrete-filled square steel tube structure. Only the tenon-mortise assembled beam-column joint of the concrete-filled circular steel tube structure does not design the internal tensile steel plate 2 and the internal arc plate 3 of the joint.

[0063] The tenon-mortise assembled beam-column joint of the concrete-filled circular steel tube structure and the construction method specifically include the following construction steps:

[0064] (1) Fabricate the joint: Fabricate a number of inner lining steel tubes 1, a number of outer joint steel tubes 4, a number of upper outer joint steel plates 5 with mortise eyes, a number of channel steels 6, and a number of outer joint lower steel plates 7 according to the size design; weld the inner lining steel tube 1, the outer joint steel tube 4, the upper outer joint steel plate 5 with mortise eyes, the channel steel 6, and the outer joint lower steel plate 7 into a joint;

[0065] (2) Connect the joint with the concrete-filled circular steel tube: Transport the prefabricated joint to the construction site, insert the inner lining steel tube 1 into the steel tube 9 of the concrete-filled circular steel tube by adjusting the angle, and weld and connect at the inner lining steel tube 1;

[0066] (3) Connect the joint node to the steel beam: By adjusting the angle of the steel beam, the upper steel plate 8.1 of the H-shaped steel beam with a tenon and the upper steel plate 5 of the joint with a mortise eye are engaged with each other and welded. The channel steel 6 and the web 8.2 of the H-shaped steel beam are connected by bolts. The lower steel plate 7 outside the joint and the lower steel plate 8.3 of the H-shaped steel beam are connected by butt welds;

[0067] (4) Pour concrete: Densely pour the concrete 10 into the steel pipe 9 of the concrete-filled circular steel pipe until the concrete 10 reaches the designed strength.

[0068] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention.

Claims

1. A mortise and tenon assembled beam-column joint of a concrete-filled steel tube structure, characterized in that: It includes prefabricated joints and H-shaped steel beams (8). The prefabricated joints include outer-node steel pipes (4), two upper outer-node steel plates with mortise eyes (5), two channel steels (6), and an outer-node lower steel plate (7). The two channel steels (6) are closely attached to the surface of the outer-node steel pipe (4) and are welded together. The upper outer-node steel plate with mortise eyes (5) and the outer-node lower steel plate (7) are respectively closely attached to the upper and lower surfaces of the channel steel (6) and are welded together. The upper steel plate of the H-shaped steel beam (8) can be meshed with the upper outer-node steel plate with mortise eyes (5). The web of the H-shaped steel beam (8) is inserted into the gap between the two channel steels (6) so that the H-shaped steel beam (8) is connected in cooperation with the two channel steels (6).

2. The steel tube concrete structure mortise and tenon assembled beam-column joint according to claim 1, characterized in that: The H-shaped steel beam (8) includes an H-shaped steel beam upper steel plate with a tenon head (8.1), an H-shaped steel beam web (8.2), and an H-shaped steel beam lower steel plate (8.3). The H-shaped steel beam upper steel plate with a tenon head (8.1) and the H-shaped steel beam lower steel plate (8.3) are respectively vertically connected to the H-shaped steel beam web (8.2). The front end of the H-shaped steel beam upper steel plate with a tenon head (8.1) is designed with meshing convex teeth. The upper outer-node steel plate with mortise eyes (5) is provided with meshing concave teeth. The H-shaped steel beam lower steel plate (8.3) is butt-jointed with the outer-node lower steel plate (7).

3. The steel tube concrete structure mortise and tenon assembled beam-column joint according to claim 2, characterized in that: The H-shaped steel beam upper steel plate with a tenon head (8.1) and the upper outer-node steel plate with mortise eyes (5) are mutually engaged and welded together. The channel steel (6) and the H-shaped steel beam web (8.2) are connected by bolts. The outer-node lower steel plate (7) and the H-shaped steel beam lower steel plate (8.3) are connected by butt welds.

4. The steel tube concrete structure mortise and tenon assembled beam-column joint according to claim 1, characterized in that: The prefabricated joint further includes an inner-lining steel pipe (1). The outer surface of the inner-lining steel pipe (1) is closely attached to the inner surface of the outer-node steel pipe (4) and is welded together.

5. The concrete-filled steel tubular structure tenon-mortise assembled beam-column joint according to claim 4, characterized in that: The concrete-filled steel tube includes a steel pipe (9) and concrete (10) located inside it. The concrete (10) is concrete with a strength grade not lower than C30.

6. The concrete-filled steel tubular structure mortise-tenon assembled beam-column joint according to claim 5, wherein: The steel pipe (9) is a square steel pipe or a circular steel pipe.

7. The steel tube concrete structure tenon-mortise assembled beam-column joint according to claim 6, characterized in that: When the steel pipe (9) is a square steel pipe, the prefabricated joint further includes an inner-node tensile steel plate (2) and an inner-node arc-shaped plate (3). The inner-node tensile steel plate (2) is perpendicularly welded to the outer-node steel pipe (4). The inner-node arc-shaped plate (3) is perpendicularly connected to the outer-node steel pipe (4) and the inner-node tensile steel plate (2).

8. The concrete-filled steel tubular structure mortise and tenon assembled beam-column joint according to claim 7, wherein: The steel strength grades of the inner-lining steel pipe (1), the inner-node tensile steel plate (2), the inner-node arc-shaped plate (3), the outer-node steel pipe (4), the upper outer-node steel plate with mortise eyes (5), the channel steel (6), and the outer-node lower steel plate (7) are not lower than Q355.

9. A construction method of a tenon and mortise assembled beam-column joint of a concrete-filled steel tubular structure as claimed in claim 8, characterized in that: When the steel pipe (9) is a square steel pipe, it specifically includes the following steps: Step 1: Fabricate the prefabricated joint: Fabricate a number of inner-lining steel pipes (1), a number of inner-node tensile steel plates (2), a number of inner-node arc-shaped plates (3), a number of outer-node steel pipes (4), a number of upper outer-node steel plates with mortise eyes (5), a number of channel steels (6), and a number of outer-node lower steel plates (7) according to the size design; weld the inner-lining steel pipe (1), the inner-node tensile steel plate (2), the inner-node arc-shaped plate (3), the outer-node steel pipe (4), the upper outer-node steel plate with mortise eyes (5), the channel steel (6), and the outer-node lower steel plate (7) into a joint; Step 2: Connect the joint with the concrete-filled steel tube: Transport the prefabricated joint to the construction site, insert the inner steel tube (1) into the steel tube (9) of the concrete-filled steel tube by adjusting the angle, and weld the connection at the inner steel tube (1). Step 3: Connect the joint with the steel beam: Make the upper steel plate (8.1) with tenon of the H-shaped steel beam and the upper steel plate (5) with mortise outside the joint bite and weld by adjusting the angle of the H-shaped steel beam (8). Connect the channel steel (6) and the web (8.2) of the H-shaped steel beam with bolts, and connect the lower steel plate (7) outside the joint and the lower steel plate (8.3) of the H-shaped steel beam with butt welds. Step 4: Pour concrete: Pour the concrete (10) densely into the steel tube (9) of the concrete-filled steel tube until the concrete (10) reaches the design strength.

10. A construction method for a mortise-tenon assembled beam-column joint of a concrete-filled steel tubular structure as described in claim 5, characterized in that: When the steel tube (9) is a circular steel tube, it specifically includes the following steps: Step 1: Fabricate the assembled joint: Fabricate a number of inner steel tubes (1), a number of outer steel tubes (4) of the joint, a number of upper steel plates (5) with mortises outside the joint, a number of channel steels (6) and a number of lower steel plates (7) outside the joint according to the dimension design; weld the inner steel tube (1), the outer steel tube (4) of the joint, the upper steel plate (5) with mortises outside the joint, the channel steel (6) and the lower steel plate (7) outside the joint into a joint. Step 2: Connect the joint with the concrete-filled steel tube: Transport the prefabricated joint to the construction site, insert the inner steel tube (1) into the steel tube (9) of the concrete-filled steel tube by adjusting the angle, and weld the connection at the inner steel tube (1). Step 3: Connect the joint with the steel beam: Make the upper steel plate (8.1) with tenon of the H-shaped steel beam and the upper steel plate (5) with mortise outside the joint bite and weld by adjusting the angle of the H-shaped steel beam (8). Connect the channel steel (6) and the web (8.2) of the H-shaped steel beam with bolts, and connect the lower steel plate (7) outside the joint and the lower steel plate (8.3) of the H-shaped steel beam with butt welds. Step 4: Pour concrete: Pour the concrete (10) densely into the steel tube (9) of the concrete-filled steel tube until the concrete (10) reaches the design strength.

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