Fabricated composite frame structure system and construction method thereof

Abstract

The application relates to a fabricated combined frame structure system and a construction method thereof, and the fabricated combined frame structure system is characterized in that: the fabricated combined frame structure system comprises a prefabricated steel beam and a prefabricated steel pipe concrete column, the prefabricated steel beam between two adjacent prefabricated steel pipe concrete columns is divided into three sections, which are a middle beam in the middle and side beams at two ends, the side beams at two ends are directly welded on the prefabricated steel pipe concrete columns, and the middle beam and the prefabricated short beams at two ends are connected through wave-shaped connecting pieces; the prefabricated steel pipe concrete column is spliced from an upper column component and a lower column component, and the bottom of the upper column component is provided with a convex gable which is directly inserted into a groove in the top of the lower column component. All the components of the application are prefabricated in a factory, so that the on-site wet work and welding work are greatly reduced, and the application has the advantages of good processing quality, high bearing capacity, strong energy consumption capacity, convenient construction, and low construction cost.

Description

Technical Field

[0001] This invention relates to the field of prefabricated buildings, and in particular to a prefabricated composite frame structure system and its construction method. Background Technology

[0002] Concrete-filled steel tubular (CFTB) columns and beams have been widely used in tall and long-span structures. However, existing CFTB columns typically use cast-in-place concrete and solid sections, resulting in long construction periods and heavy weight. Beam-column connections are mostly welded, but welding is expensive, susceptible to weather conditions, and has poor seismic performance. During earthquakes, the steel frame may suffer weld failure at beam-column connections, leading to severe structural collapse. To prevent beam failure at the beam ends, the flanges of the steel beams are typically weakened outside the beam-column connection zone (using a dog-bone connection) to reduce the bending capacity of that section. However, this method significantly weakens the bending capacity of the steel beams. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a prefabricated composite frame structure system and its construction method that features good processing quality, high load-bearing capacity, strong energy dissipation capacity, and convenient construction.

[0004] The present invention is implemented using the following scheme: a prefabricated composite frame structure system, including prefabricated steel beams and prefabricated steel-concrete composite columns. The prefabricated steel beam between two adjacent prefabricated steel-concrete composite columns is divided into three sections: a middle beam and two end beams. The end beams are directly welded to the prefabricated steel-concrete composite columns. The middle beam and the two end prefabricated short beams are connected by corrugated connectors. The prefabricated steel-concrete composite column is assembled from an upper column component and a lower column component. The bottom of the upper column component is provided with a tenon that is directly inserted into the groove at the top of the lower column component.

[0005] Furthermore, the upper column component and the lower column component are hollow structures, each including an outer steel pipe, an inner steel pipe, and concrete poured between them. An annular horizontal steel plate is welded between the outer steel pipe and the inner steel pipe at the lower end of the upper column component and the upper end of the lower column component. Several upper stiffening ribs are welded to the annular horizontal steel plate at the lower end of the upper column component, and several lower stiffening ribs are welded to the annular horizontal steel plate at the upper end of the lower column component. The upper and lower stiffening ribs are connected together by high-strength bolts.

[0006] Furthermore, a T-shaped seat shell with an inner cavity of T-shape and filled with concrete is welded to the middle of the lower end of the upper column component. The lower part of the T-shaped seat shell extends downward from the lower end of the upper column component to form the convex tenon. Several lower toothed plates are welded to the outer periphery of the lower end of the convex tenon, and several upper toothed plates are welded to the inner periphery of the opening of the groove. Epoxy mortar is poured into the groove between the upper and lower toothed plates on the periphery of the convex tenon.

[0007] Furthermore, the lower end of the precast steel-concrete column is connected to the upper end of the foundation made of concrete. A foundation steel pipe is embedded in the middle of the upper end of the foundation, and a groove is formed in the middle of the foundation steel pipe for the lower end of the precast steel-concrete column to be directly inserted. A trapezoidal horizontal steel plate is welded to the outer periphery of the upper end of the foundation steel pipe, and a lower stiffening rib is welded to the trapezoidal horizontal steel plate. A triangular reinforcing plate is welded between the lower side of the trapezoidal horizontal steel plate and the foundation steel pipe. An anchor bolts whose upper ends are connected to the trapezoidal horizontal steel plate are pre-embedded in the foundation.

[0008] Furthermore, the cross-section of the middle beam and the side beam of the precast steel beam is I-shaped, and the beam flanges at the upper and lower positions of the wavy connector at the connection point extend outward. The middle beam and the side beam are welded to one end with an end plate connected together by a long bolt, and a spring is sleeved on the long bolt between the head of the long bolt and the end plate.

[0009] Furthermore, upper closed box-shaped cross-section blocks and lower closed box-shaped cross-section blocks are welded to the beam flange extensions above and below the end plate and the corrugated connector. The upper and lower sides of the corrugated connector are corrugated, and the bottom of the upper closed box-shaped cross-section block and the top of the lower closed box-shaped cross-section block are also corrugated. The wave wavelength direction of the corrugation is consistent with the length direction of the precast steel beam. The two ends of the corrugated connector are fitted between the upper and lower closed box-shaped cross-section blocks.

[0010] Furthermore, the corrugated connector has connecting plates welded to both ends, and the connecting plates are connected to the end plates of the middle beam and the side beam by high-strength bolts.

[0011] Another technical solution of the present invention: a construction method for the prefabricated composite frame structure system as described above, comprising the following steps: (1) Prefabricate the side beams and middle beams of the prefabricated steel beams, the upper and lower column components of the prefabricated steel pipe concrete columns, the corrugated connectors and the foundation steel pipes in the factory, weld the side beams of the prefabricated steel beams to the upper and lower column components, and transport the above prefabricated components to the construction site. (2) After positioning the foundation steel pipe, insert the anchor bolt and tighten the nut. The anchor bolt should be buried in the foundation to a depth of at least 25 times the anchor bolt diameter. Pour the foundation concrete. (3) Install the precast steel pipe concrete column bottom column component on the foundation steel pipe. Insert the protruding tenon at the lower end of the bottom column component into the groove of the foundation steel pipe. Fill the groove of the foundation steel pipe with epoxy mortar. Insert the high-strength bolt into the hole between the bottom column component and the upper and lower stiffening ribs on the foundation steel pipe and tighten the nut. (4) Install the upper column components sequentially on the lower column components to form a precast steel pipe concrete column. Insert the protruding tenon at the lower end of the upper column component into the groove at the upper end of the lower column component. Fill the groove of the lower column component with epoxy putty. Insert the high-strength bolts into the holes between the upper and lower stiffening ribs of the upper and lower column components and tighten the nuts. (5) Install an intermediate beam between the side beams welded on two adjacent precast steel pipe concrete columns, and insert a corrugated connector into the middle of the ends of the intermediate beam and the side beam.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) All components are prefabricated in the factory, which greatly reduces on-site wet work and welding work, and has the advantages of good processing quality, high bearing capacity, strong energy consumption capacity, convenient construction and low construction cost; (2) Long bolts with springs are set at the connection of the steel beams, which reduces the bending stiffness of the bolt group, thereby ensuring that the plastic hinge will definitely occur at the connection. The long bolts with springs can also improve the deformation capacity and energy consumption capacity of the connection; (3) The steel beams are positioned during the installation stage and shear force is transferred during the use stage through the corrugated connectors; (4) Epoxy mortar is injected into the groove at the column connection to realize the mechanical interlocking of the upper and lower column connections, which improves the pull-out resistance, shear bearing capacity and corrosion resistance of the column connection during the use stage.

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0014] Figure 1 This is a simplified diagram of the overall structure of the prefabricated modular frame structure system of the present invention, where ○ represents the connection point; Figure 2 This is a cross-sectional view of the connection between the upper and lower column components of this invention; Figure 3 yes Figure 2 Section 2-2; Figure 4 yes Figure 2 Section 3-3; Figure 5 yes Figure 2 Section 4-4; Figure 6 yes Figure 2 Section 5-5; Figure 7 This is a partial view of the upper column component before connection in an embodiment of the present invention; Figure 8 This is a partial view of the lower column component before connection according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the connection structure between the bottom column component and the foundation in an embodiment of the present invention; Figure 10 yes Figure 9 Section 6-6; Figure 11 This is a schematic diagram of the precast steel beam before the connection of the middle beam and the side beam in an embodiment of the present invention; Figure 12 This is a schematic diagram of the connection structure between the middle beam and the side beam of the precast steel beam in an embodiment of the present invention; Figure 13 yes Figure 12 Section 7-7; Figure 14 This is a perspective view of the side beam of the precast steel beam according to an embodiment of the present invention; Figure 15 This is a perspective view of the corrugated connector of the prefabricated steel beam according to an embodiment of the present invention; Figure 16 This is a schematic diagram of a beam-column joint according to an embodiment of the present invention; Explanation of the labels in the diagram: 1-Outer steel pipe, 2-Inner steel pipe, 3-Concrete, 4-Annular horizontal steel plate, 5-Diaphragm, 6-Upper stiffener, 7-Lower stiffener, 8-Flange, 9-Upper toothed plate, 10-Lower toothed plate, 11-High-strength bolt, 12-Groove, 13-Epoxy putty, 14-Upper wing plate, 5-Lower wing plate, 16-Upper closed box section block, 17-Lower closed box section block, 18-Wave-shaped connector, 19-Connecting plate, 20-Long bolt, 21-Spring, 22-Washer, 23-End plate, 24-Web plate, 25-Anchor bolt, 26-Trapezoidal horizontal steel plate, 27-Triangular reinforcing plate, 28-Foundation steel pipe, 29-Central circular plate. Detailed Implementation

[0015] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0016] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0017] like Figures 1-16As shown, a prefabricated composite frame structure system includes precast steel beams and precast steel-concrete composite columns. For easy installation and positioning, the precast steel beams between two adjacent precast steel-concrete composite columns are divided into three sections: a middle beam and two end beams. The end beams are directly welded to the precast steel-concrete composite columns. The middle beam and the two end precast short beams are connected by a corrugated connector 18. The precast steel-concrete composite columns are assembled from upper and lower column components. The bottom of the upper column component is provided with a tenon 8 that is directly inserted into the groove 12 at the top of the lower column component. To prevent connection failure of the precast steel-concrete composite columns of the frame, the connection is set at the position where the bending moment is small in the middle of the precast steel-concrete composite column. The column joint has the characteristics of reliable force transmission, simple construction, space saving, and beautiful appearance.

[0018] In this embodiment, in order to save on the amount of concrete 3 and reduce the self-weight, the frame column adopts a hollow sandwich structure, that is, the upper column component and the lower column component are hollow structures, each including an outer steel pipe 1, an inner steel pipe 2 and concrete 3 poured between the two. The lower end of the upper column component and the upper end of the lower column component are welded with an annular horizontal steel plate 4 between the outer steel pipe 1 and the inner steel pipe 2. In order to achieve reliable transmission of beam bending moment and ensure the bending resistance of the column connection, several upper stiffening ribs 6 are welded on the annular horizontal steel plate 4 at the lower end of the upper column component and several lower stiffening ribs 7 are welded on the annular horizontal steel plate 4 at the upper end of the lower column component. The upper and lower stiffening ribs are connected together by high-strength bolts 11.

[0019] In this embodiment, a T-shaped seat shell with an inner cavity of T-shape and filled with concrete is welded to the middle of the lower end of the upper column component. The T-shaped seat shell consists of an upper and lower horizontal diaphragm 5, a central circular plate 29, and a connecting cylinder connecting the lower horizontal diaphragm and the central circular plate 29. The upper and lower horizontal diaphragms 5 can improve the integrity of the concrete 3 inside the tenon 8 and the column, so as to prevent the tenon from being damaged by local pressure. The lower part of the T-shaped seat shell extends downward from the lower end of the upper column component to form the tenon 8. In order to improve the pull-out resistance of the column connection, several lower toothed plates 10 are welded to the outer periphery of the lower end of the tenon 8, and several upper toothed plates 9 are welded to the inner periphery of the opening of the groove 12. Epoxy mortar 13 is injected between the upper and lower toothed plates outside the tenon 8 in the groove 12 to ensure that the pull-out resistance, shear bearing capacity and corrosion resistance of the column connection are improved during the service stage. The tenon 8 of the upper column component is directly inserted into the groove 12 at the top of the lower column component and rotated, grouted and bolted to realize the connection between the upper and lower columns.

[0020] In this embodiment, the lower end of the precast steel-concrete column is connected to the upper end of the foundation made of concrete. A foundation steel pipe 28 is embedded in the middle of the upper end of the foundation. A groove 12 is formed in the middle of the foundation steel pipe 28 for the lower end of the precast steel-concrete column to be directly inserted into the tenon 8. A trapezoidal horizontal steel plate 26 is welded to the outer periphery of the upper end of the foundation steel pipe 28. A lower stiffening rib 7 is welded on the trapezoidal horizontal steel plate 26. A triangular reinforcing plate 27 is welded between the lower side of the trapezoidal horizontal steel plate 26 and the foundation steel pipe 28. An anchor bolt 25 connected to the trapezoidal horizontal steel plate 26 is pre-embedded in the foundation. The connection between the precast steel-concrete column and the foundation adopts a connection structure similar to that of upper and lower column members. The tenon 8 of the lower column member is directly inserted into the groove 12 in the middle of the foundation steel pipe 28. At the same time, the upper stiffening rib 6 of the lower column member and the lower stiffening rib 7 on the periphery of the foundation steel pipe 28 are connected together by high-strength bolts. At the same time, an upper toothed plate 9 is also provided in the groove 12 of the foundation steel pipe 28.

[0021] In this embodiment, the middle beam and side beams of the precast steel beam have I-shaped cross-sections. Beam flanges extend outwards at the positions above and below the wavy connectors at the joints. Both the middle beam and side beams have end plates welded together at opposite ends by long bolts 20. A spring 21 is fitted onto each long bolt, located between the bolt head and the end plate. The long bolts 20 with springs 21 reduce the bending stiffness of the bolt group, thus ensuring that the plastic hinge occurs at the joint cross-section and not at the beam-column joint. The long bolts 20 with springs 21 also improve the deformation capacity and energy dissipation capacity of the connection.

[0022] In this embodiment, upper closed box-shaped cross-section blocks 16 and lower closed box-shaped cross-section blocks 17 are welded to the beam flange extensions above and below the end plate and the corrugated connector 18. The upper and lower sides of the corrugated connector 18 are corrugated, and the bottom of the upper closed box-shaped cross-section block 16 and the top of the lower closed box-shaped cross-section block 17 are also corrugated. The wave wavelength direction of the corrugated shape is consistent with the length direction of the precast steel beam. The two ends of the corrugated connector 18 are fitted between the upper and lower closed box-shaped cross-section blocks.

[0023] In this embodiment, the corrugated connector 18 is welded with connecting plates 19 at both ends, and the connecting plates 19 are connected to the end plates of the middle beam and the side beam by high-strength bolts 11.

[0024] A construction method for the prefabricated composite frame structure system as described above includes the following steps: (1) Prefabricate the side beams and middle beams of the prefabricated steel beams, the upper and lower column components of the prefabricated steel pipe concrete columns, the corrugated connectors and the foundation steel pipes in the factory, weld the side beams of the prefabricated steel beams to the upper and lower column components, and transport the above prefabricated components to the construction site. (2) After positioning the foundation steel pipe, insert the anchor bolt 25 and tighten the nut. The anchor bolt 25 is embedded in the foundation to a depth of at least 25 times the anchor bolt diameter. Pour the foundation concrete 3. (3) Install the precast steel pipe concrete column bottom column component on the foundation steel pipe. Insert the protruding tenon 8 at the lower end of the bottom column component into the groove 12 of the foundation steel pipe. Insert the lower tooth plate 10 of the protruding tenon 8 of the bottom column component into the groove 12 of the foundation steel pipe at a 45-degree angle to the plane of the upper tooth plate 9. Rotate the protruding tenon 8 at a 45-degree angle to form a self-locking state between the bottom column component and the foundation steel pipe. Fill the groove 12 of the foundation steel pipe with epoxy putty 13. Insert the high-strength bolt 11 into the hole between the upper and lower stiffening ribs on the bottom column component and the foundation steel pipe, and screw on the nut. (4) Install the upper column components sequentially on the lower column components to form a precast steel pipe concrete column. Insert the convex tenon 8 at the lower end of the upper column component into the groove 12 at the upper end of the lower column component. Insert the lower tooth plate 10 of the convex tenon 8 of the upper column component into the groove 12 of the lower column component at a 45-degree angle to the plane of the upper tooth plate 9 of the lower column component and rotate the convex tenon 8 at a 45-degree angle to form a self-locking state between the upper and lower columns. Fill the groove 12 of the lower column component with epoxy putty 13. Insert the high-strength bolt 11 into the hole between the upper and lower stiffening ribs of the upper column component and the lower column component and tighten the nut. (5) Install an intermediate beam between the side beams welded on the two adjacent precast steel pipe concrete columns, insert a corrugated connector 18 into the middle of the ends of the intermediate beam and the side beam, connect the corrugated connector 18 connecting plate 19 to the end plates of the two side beams with high-strength bolts 11; insert the long bolt 20 between the springs 21 and then insert the long bolt 20 with the spring 21 into the holes of the end plates 23 of the beams on both sides of the connection and screw on the nuts.

[0025] The two-stage design method for resisting bending moment in prefabricated composite frame steel beams is as follows: The expression for the proportionality coefficient between the height of the wavy connector 18 and the total beam cross-section height is: (1) in The wavy connector is 18 cm high. The height of each of the upper and lower closed box-shaped cross-section blocks can be taken as... , The ratio of the height of the corrugated connector 18 to the total cross-sectional height is defined as the proportionality coefficient. The design expression for the tensile bearing capacity of a 20mm long bolt is: (2) in This represents the design value for the tensile bearing capacity of a single bolt (20). This represents the effective cross-sectional area of ​​the bolt at the threaded section. This is the effective diameter of the bolt at the thread. The design value for the tensile strength of the bolt is given. To account for the prying force caused by the lever effect, the design value for the tensile strength of the bolt steel can be taken as the design value. 0.8 times the value, that is .

[0026] The design expression for the operation of spring 21 is: (3) in, The compressive force acting on spring 21 Let be the stiffness coefficient of spring 21. This represents the amount of compressive deformation. Due to the presence of spring 21, the axial tensile force or axial compressive force of bolt 20 increases slowly. When the high-strength bolt 11 yields, the axial tensile force or axial compressive force of bolt 20 is only... At this point, the long bolt 20 is still in the elastic stage; as the rotation of the connection node further increases, bolt 20 only yields under tension after large deformation. Therefore, the entire bolt group connection exhibits relatively small bending stiffness, but its bending bearing capacity is not lower than that of a traditional bolt connection node. This allows the plastic hinge of the steel beam to occur at the connection without sacrificing the bending bearing capacity.

[0027] The design expression for the shear resistance of the prefabricated composite frame beam connection is: (4) in, , and The design value of shear strength for the web of the steel beam, the web of the protruding section of the steel beam, and the web of the corrugated shear connector; , and This refers to the cross-sectional area of ​​the web of the steel beam, the web of the protruding section of the steel beam, and the web of the corrugated shear connector.

[0028] This prefabricated composite frame structure system has the following advantages: 1) All components are prefabricated in the factory, greatly reducing on-site wet work and welding, resulting in good processing quality, convenient construction, and low construction costs; 2) Spring-loaded long bolts are installed at the steel beam connections, reducing the bending stiffness of the bolt group and ensuring that the plastic hinge occurs at the connection section and not at the beam-column connection. The spring-loaded long bolts also improve the deformation capacity and energy dissipation capacity of the connection; 3) Corrugated connectors are used between the steel beams to achieve steel beam positioning during installation and shear force transfer during use; 4) Hollow-core steel-concrete composite columns are used, with the bottom of the upper column... The protruding tenon is directly inserted into the groove at the top of the lower column and rotated to achieve the positioning of the frame column during the installation stage. Epoxy mortar is poured into the groove to achieve mechanical interlocking at the connection between the upper and lower columns, improving the pull-out resistance, shear bearing capacity and corrosion resistance of the column connection during the service stage; 5) Two layers of transverse diaphragms are set in the tenon at the bottom of the hollow sandwich steel tube concrete column to improve the integrity of the concrete and column inside the tenon and prevent local pressure failure of the tenon; 6) A ring-shaped horizontal steel plate is welded at the bottom of the upper column and the top of the lower column. Several longitudinal stiffening ribs are welded on the ring-shaped horizontal steel plate. The longitudinal stiffening ribs between the upper and lower columns are connected by high-strength bolts, so that the column connection can also withstand a certain bending moment.

[0029] The invention has the following main uses: 1) It can be used in areas with high requirements for seismic fortification to improve the deformation capacity and energy dissipation capacity of building structures; 2) It can be used in projects with high time requirements to shorten the construction period and improve the construction quality through industrialization technology; 3) It can be used in tall or large-span buildings to increase building space.

[0030] Unless otherwise stated, if any of the technical solutions disclosed in this invention specify a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this invention discloses only some numerical values ​​to illustrate the technical solutions of this invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0031] If this invention discloses or relates to mutually fixedly connected components or structural parts, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0032] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0033] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A prefabricated modular frame structure system, characterized in that: The system includes precast steel beams and precast steel-concrete composite columns. The precast steel beam between two adjacent precast steel-concrete composite columns is divided into three sections: a middle beam and two end beams. The end beams are directly welded to the precast steel-concrete composite columns. The middle beam and the two end precast short beams are connected by corrugated connectors. The precast steel-concrete composite column is assembled from an upper column component and a lower column component. The bottom of the upper column component has a tenon that directly inserts into a groove at the top of the lower column component. Both the upper and lower column components are hollow structures, each including an outer steel pipe, an inner steel pipe, and concrete poured between them. The lower end of the upper column component and the upper end of the lower column component... A ring-shaped horizontal steel plate is welded between the outer and inner steel pipes. Several upper stiffening ribs are welded to the ring-shaped horizontal steel plate at the lower end of the upper column component, and several lower stiffening ribs are welded to the ring-shaped horizontal steel plate at the upper end of the lower column component. The upper and lower stiffening ribs are connected together by high-strength bolts. A T-shaped seat shell with a T-shaped inner cavity and filled with concrete is welded to the middle of the lower end of the upper column component. The lower part of the T-shaped seat shell extends downward from the lower end of the upper column component to form the convex tenon. Several lower toothed plates are welded to the outer periphery of the lower end of the convex tenon, and several upper toothed plates are welded to the inner periphery of the opening of the groove. Epoxy mortar is poured between the upper and lower toothed plates on the periphery of the convex tenon in the groove.

2. The prefabricated modular frame structure system according to claim 1, characterized in that: The lower end of the precast steel-concrete column is connected to the upper end of the foundation made of concrete. A foundation steel pipe is embedded in the middle of the upper end of the foundation. A groove is also formed in the middle of the foundation steel pipe for the lower end of the precast steel-concrete column to be directly inserted. A trapezoidal horizontal steel plate is welded to the outer periphery of the upper end of the foundation steel pipe. A lower stiffening rib is welded to the trapezoidal horizontal steel plate. A triangular reinforcing plate is welded between the lower side of the trapezoidal horizontal steel plate and the foundation steel pipe. An anchor bolts with their upper ends connected to the trapezoidal horizontal steel plate are pre-embedded in the foundation.

3. The prefabricated modular frame structure system according to claim 1, characterized in that: The middle beam and the side beam of the precast steel beam are both I-shaped in cross section. The beam flanges at the upper and lower positions of the wavy connector at the connection point extend outward. The middle beam and the side beam are both welded to end plates connected together by long bolts at opposite ends. A spring is sleeved on the long bolt between the head of the long bolt and the end plate.

4. The prefabricated modular frame structure system according to claim 3, characterized in that: The upper closed box-shaped section block and the lower closed box-shaped section block are welded to the beam flange extension sections above and below the end plate and the corrugated connector. The upper and lower sides of the corrugated connector are corrugated. The bottom of the upper closed box-shaped section block and the top of the lower closed box-shaped section block are also corrugated. The wave wavelength direction of the corrugation is consistent with the length direction of the precast steel beam. The two ends of the corrugated connector are fitted between the upper and lower closed box-shaped section blocks.

5. The prefabricated modular frame structure system according to claim 3, characterized in that: The corrugated connector has connecting plates welded to both ends, and the connecting plates are connected to the end plates of the middle beam and the side beam by high-strength bolts.

6. A construction method for the prefabricated composite frame structure system as described in claim 2, characterized in that: Includes the following steps: (1) Prefabricate the side beams and middle beams of the prefabricated steel beams, the upper and lower column components of the prefabricated steel pipe concrete columns, the corrugated connectors and the foundation steel pipes in the factory, weld the side beams of the prefabricated steel beams to the upper and lower column components, and transport the above prefabricated components to the construction site. (2) After positioning the foundation steel pipe, insert the anchor bolt and tighten the nut. The anchor bolt should be buried in the foundation to a depth of at least 25 times the anchor bolt diameter. Pour the foundation concrete. (3) Install the precast steel pipe concrete column bottom column component on the foundation steel pipe. Insert the protruding tenon at the lower end of the bottom column component into the groove of the foundation steel pipe. Fill the groove of the foundation steel pipe with epoxy mortar. Insert the high-strength bolt into the hole between the bottom column component and the upper and lower stiffening ribs on the foundation steel pipe and tighten the nut. (4) Install the upper column components sequentially on the lower column components to form a precast steel pipe concrete column. Insert the protruding tenon at the lower end of the upper column component into the groove at the upper end of the lower column component. Fill the groove of the lower column component with epoxy putty. Insert the high-strength bolts into the holes between the upper and lower stiffening ribs of the upper and lower column components and tighten the nuts. (5) Install an intermediate beam between the side beams welded on two adjacent precast steel pipe concrete columns, and insert a corrugated connector into the middle of the ends of the intermediate beam and the side beam.

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