Module building beam column cast steel connecting joint

Abstract

The utility model relates to the technical field of structural engineering, in particular to a module building beam column cast steel connecting joint which comprises a square steel pipe column, an H-shaped steel beam and a connecting device. The square steel pipe column and the H-shaped steel beam are fixedly connected through the connecting device; the connecting device comprises an upper cast steel connecting piece and a lower cast steel connecting piece which are connected up and down; the square steel pipe column and the H-shaped steel beam located on the upper portion are fixedly connected with the cast steel upper connecting piece, and the square steel pipe column and the H-shaped steel beam located on the lower portion are fixedly connected with the cast steel lower connecting piece. According to the utility model, the problem of insufficient construction space of nodes among modules is solved; hydroelectric pipelines are inconvenient to install; construction is difficult to realize; and meanwhile, the construction accuracy and the integrality of a node domain are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of structural engineering, in particular to a modular building beam-column cast steel connection node. Background Art

[0002] Currently, there's no unified definition system for modular construction in China. This field is closely tied to the development of prefabricated buildings, which have long relied on advancements in steel structure construction technology. With the acceleration of my country's industrialization, the design of prefabricated buildings has gradually shifted toward modularity, and construction processes are becoming increasingly standardized. However, as an emerging concept, modular construction differs significantly from traditional prefabricated construction. While prefabricated construction focuses on dividing architectural elements into modular units for assembly, modular construction emphasizes the integrated assembly of three-dimensional modules. Its connection nodes exhibit a unique "eight columns and sixteen beams" structural characteristic, which is crucial for the connection efficiency of modular steel structures.

[0003] However, the current design of connection nodes between modular buildings faces multiple challenges: First, due to the presence of building elements such as floor slabs and partition walls, the lack of sufficient operating space during node installation often makes it difficult to implement modular construction at the functional level of fully furnished buildings, limiting the improvement of construction efficiency and quality. Second, such nodes require high construction precision and are highly sensitive to errors, which can easily lead to construction delays and quality issues, and even make them difficult to successfully apply in actual projects. Third, some connection node designs have problems such as significant cross-sectional weakening and cumbersome installation processes, further hindering the widespread application and promotion of modular building technology in engineering practice. Therefore, optimizing the design of connection nodes between modules has become a key issue in promoting the development of modular building technology. Utility Model Content

[0004] The purpose of the present utility model is to provide a modular building beam-column cast steel connection node in order to solve at least one of the above technical problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A modular building beam-column cast steel connection node, comprising a square steel tube column and an H-shaped steel beam, and a connection device;

[0007] The square steel tube column and the H-shaped steel beam are fixedly connected by the connecting device;

[0008] The connecting device includes a cast steel upper connecting piece and a cast steel lower connecting piece connected up and down; the square steel pipe column and the H-shaped steel beam located at the upper part are respectively fixedly connected to the cast steel upper connecting piece, and the square steel pipe column and the H-shaped steel beam located at the lower part are respectively fixedly connected to the cast steel lower connecting piece.

[0009] Furthermore, the connecting device further comprises: a connecting plate, a shear key, and a pin;

[0010] The connecting plate is arranged between the cast steel upper connecting piece and the cast steel lower connecting piece; the shear key passes through the connecting plate, and the two ends of the shear key pass through the connecting surfaces of the cast steel upper connecting piece and the cast steel lower connecting piece respectively; the pin passes through the shear key and fits with the lower surface of the cast steel upper connecting piece.

[0011] Furthermore, the lower surface of the cast steel upper connecting piece and the upper surface of the cast steel lower connecting piece are both provided with local protrusions at the edges of the contact surfaces with the connecting plate for fixing the connecting plate.

[0012] Furthermore, shear key embedding holes are provided at corresponding positions on the outer surfaces of the cast steel upper connecting piece, the cast steel lower connecting piece and the connecting plate; the size of the shear key matches the shear key embedding hole, and the shear key passes through the shear key embedding hole to connect the cast steel upper connecting piece, the cast steel lower connecting piece and the connecting plate.

[0013] Furthermore, the transverse cross-section of the shear key is circular; a pin embedding hole is transversely provided on the shear key, the length of the pin is greater than the diameter of the shear key, and the pin passes through the pin embedding hole; the shear key and the upper surface of the cast steel lower connecting piece are fixed by welding.

[0014] Furthermore, the longitudinal cross-section of the pin is semicircular.

[0015] Furthermore, the cast steel upper connector and the cast steel lower connector are both L-shaped cavity structures formed by integral casting; the connections between the ribs and the web flanges, and the connections between the webs and the flanges of the cast steel upper connector and the cast steel lower connector are chamfered.

[0016] Furthermore, stiffening plates are provided inside the cast steel upper connecting piece and the cast steel lower connecting piece in the direction of connection with the square steel pipe column, and construction operation holes are provided on the stiffening plates.

[0017] Furthermore, reserved threading holes are provided on the outer surface of the cast steel upper connecting piece, the outer surface of the cast steel lower connecting piece, and the connecting plate.

[0018] Furthermore, the square steel tube column and the H-shaped steel beam are respectively connected to adjacent cast steel connectors by welding.

[0019] The beneficial effects of the utility model are:

[0020] The utility model realizes a stable connection between the square steel pipe column and the H-shaped steel beam through a connecting device; the connecting device adopts a cast steel upper connecting piece and a cast steel lower connecting piece connected up and down, and cooperates with a connecting plate, shear key and pin to form a multi-guaranteed connection system.

[0021] The L-shaped cavity structure and chamfer treatment of the cast steel connector of the present invention enhance the structural strength and stress dispersion capability, while the provision of the stiffening plate and the construction operation hole improves the stability of the connection and the convenience of construction.

[0022] The design of the reserved threading holes in the utility model meets the requirements of electrical wiring.

[0023] The utility model not only has a compact structure and reliable connection, but also has technical effects such as high construction efficiency and convenient maintenance, providing a strong guarantee for the safety and durability of modular buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the cast steel connection node of the modular building beam column according to one embodiment of the present utility model;

[0025] Figure 2 Schematic diagram of the decomposed structure of the cast steel connection node of the modular building beam column in one embodiment of the utility model Figure 1 ;

[0026] Figure 3 Schematic diagram of the decomposed structure of the cast steel connection node of the modular building beam column in one embodiment of the utility model Figure 2 ;

[0027] Figure 4 This is a perspective view of the assembly of the cast steel connection node of the modular building beam column according to one embodiment of the present invention.

[0028] In the figure: 1. Square steel pipe column, 2. H-shaped steel beam, 3. Cast steel upper connector, 4. Connecting plate, 5. Cast steel lower connector, 6. Stiffener, 7. Shear key, 8. Pin, 9. Shear key embedding hole, 10. Reserved threading hole, 11. Construction operation hole, 12. Pin embedding hole. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1

[0031] Figure 1 This is a schematic diagram of the overall structure of the cast steel connection node of the modular building beam column according to one embodiment of the present utility model; Figure 2 Schematic diagram of the decomposed structure of the cast steel connection node of the modular building beam column in one embodiment of the utility model Figure 1 ; Figure 3 Schematic diagram of the decomposed structure of the cast steel connection node of the modular building beam column in one embodiment of the utility model Figure 2 ; Figure 4 This is a perspective view of the modular building beam-column cast steel connection node assembly according to one embodiment of the present invention. Figure 1-4 As shown, according to one embodiment of the present utility model, a modular building beam-column cast steel connection node includes a square steel tube column 1 and an H-shaped steel beam 2, and a connection device;

[0032] The square steel tube column 1 and the H-shaped steel beam 2 are fixedly connected by a connecting device;

[0033] The connecting device includes a cast steel upper connecting piece 1 and a cast steel lower connecting piece 5 connected upper and lower; the square steel pipe column 1 and H-shaped steel beam 2 located at the upper part are fixedly connected to the cast steel upper connecting piece 3 respectively, and the square steel pipe column 1 and H-shaped steel beam 2 located at the lower part are fixedly connected to the cast steel lower connecting piece 5 respectively.

[0034] Preferably, the square steel tube column 1 and the H-shaped steel beam 2 are respectively connected to adjacent cast steel connectors by welding.

[0035] In this embodiment, the core of the cast steel connection node of the modular building beam column lies in the design of the connection device. The connection device consists of an upper cast steel upper connector 3 and a lower cast steel lower connector 5, which are connected up and down through a precise structure. The square steel pipe column 1 and H-shaped steel beam 2 located above the structure are firmly combined with the cast steel upper connector 3 by welding to ensure the stability and load-bearing capacity of the upper structure. Similarly, the square steel pipe column 1 and H-shaped steel beam 2 located below are also tightly connected to the cast steel lower connector 5 using welding technology to form a stable support system. This connection method not only enhances the overall strength of the beam-column node, but also makes the modular building more convenient and efficient during assembly and disassembly.

[0036] This utility model achieves an efficient and stable connection between square steel columns and H-shaped steel beams through an innovative design of cast steel connection nodes for modular building beams and columns. The connection device utilizes upper and lower cast steel connectors, combined with welding technology, significantly improving the load-bearing capacity and structural stability of the node. At the same time, this utility model also optimizes the use of construction space, facilitating construction operations within the module and resolving the space constraints associated with traditional node construction. The technical solution of this utility model demonstrates significant advantages in improving construction efficiency, ensuring structural safety, and promoting the development of modular buildings.

[0037] According to one embodiment of the present invention, the connecting device further comprises: a connecting plate 4, a shear key 7, and a pin 8;

[0038] The connecting plate 4 is arranged between the cast steel upper connecting part 3 and the cast steel lower connecting part 5; the shear key 7 passes through the connecting plate 4, and the two ends of the shear key 7 pass through the connecting surfaces of the cast steel upper connecting part 3 and the cast steel lower connecting part 5 respectively; the pin 8 passes through the shear key 7 and fits with the lower surface of the cast steel upper connecting part 3.

[0039] In this embodiment, the design of the connecting device further enhances the stability and functionality of the cast steel connection node of the modular building beam column. Specifically, the connecting plate 4 is cleverly placed between the cast steel upper connector 3 and the cast steel lower connector 5, forming a solid support layer. The shear key 7, as a key connecting component, not only passes through the connecting plate 4, but also passes through the connecting surface of the cast steel upper connector 3 and the cast steel lower connector 5, achieving a tight connection between the three. In addition, the role of the pin 8 cannot be ignored. It passes through the shear key 7 and fits tightly on the lower surface of the cast steel upper connector 3. Through this design, the shear key 7 is firmly locked in the connecting device, thereby effectively improving the shear resistance and overall stability of the node. This multi-layer, multi-component synergy ensures that the beam-column connection node can remain stable and reliable when subjected to various external forces. The shear key 7 has sufficient length to connect the cast steel upper connector 3, the connecting plate 4 and the cast steel lower connector 5.

[0040] This utility model further enhances the connection performance and stability of the cast steel beam-column connection nodes in modular buildings by introducing components such as connecting plates, shear keys, and pins. The connecting plates serve as a supporting layer, effectively distributing the load; the shear keys, by penetrating multiple layers of connectors, provide strong shear resistance; and the locking design of the pins ensures the stability of the shear keys in the connection device. These designs not only improve the load-bearing capacity of the nodes, but also enhance their shear resistance and durability. Furthermore, this connection device simplifies the construction process and improves construction efficiency, providing strong technical support for the development of modular buildings.

[0041] According to one embodiment of the present invention, the lower surface of the cast steel upper connector 3 and the upper surface of the cast steel lower connector 5 are both provided with local protrusions at the edges of the contact surfaces with the connecting plate 4 for fixing the connecting plate 4 .

[0042] In this embodiment, the design details of the cast steel upper connector 3 and the cast steel lower connector 5 further reflect the pursuit of connection stability. Specifically, in order to more effectively fix the connecting plate 4, the lower surface of the cast steel upper connector 3 and the upper surface of the cast steel lower connector 5 are carefully designed with local protrusions at the edges that contact the connecting plate 4. These local protrusions not only increase the contact area with the connecting plate 4, but also provide additional fixing force for the connecting plate 4 through physical bite. When the connecting plate 4 is placed between the cast steel upper connector 3 and the cast steel lower connector 5, these local protrusions can be tightly embedded in the edge of the connecting plate 4, thereby preventing the connecting plate from slipping or loosening when subjected to force. This design significantly enhances the overall stability and reliability of the connecting device.

[0043] The utility model effectively improves the fixing effect between the connecting plate and the cast steel connecting piece by arranging local protrusions at the edges of the contact surfaces of the cast steel upper connecting piece and the cast steel lower connecting piece.

[0044] According to one embodiment of the present invention, shear key embedding holes 9 are provided at corresponding positions on the outer surfaces of the cast steel upper connector 3, the cast steel lower connector 5 and the connecting plate 4;

[0045] The size of the shear key 7 matches the shear key embedding hole 9 , and the shear key 7 passes through the shear key embedding hole 9 to connect the cast steel upper connector 3 , the cast steel lower connector 5 and the connecting plate 4 .

[0046] Preferably, the transverse cross-section of the shear key 7 is circular; a pin embedding hole 12 is transversely provided on the shear key 7, the length of the pin 8 is greater than the diameter of the shear key 7, and the pin 8 passes through the pin embedding hole 12; the shear key 7 is fixed to the upper surface of the cast steel lower connecting piece 5 by welding.

[0047] Preferably, the longitudinal cross-section of the pin 8 is semicircular.

[0048] In this embodiment, shear key embedding holes 9 are cleverly designed at corresponding positions on the outer surfaces of the cast steel upper connector 3, the cast steel lower connector 5 and the connecting plate 4, and the sizes of these holes perfectly match the shear keys 7. The size of the shear key embedding hole 9 should be slightly larger than the size of the shear key 7; the size of the pin embedding hole 12 should be slightly larger than the size of the pin 8. The shear key 7, whose transverse cross-section is circular, not only passes through these shear key embedding holes 9, but also realizes a firm connection between the cast steel upper connector 3, the connecting plate 4 and the cast steel lower connector 5. In particular, a pin embedding hole 12 is transversely provided on the shear key 7, and the pin 8 - whose longitudinal cross-section is semicircular and whose length is greater than the diameter of the shear key 7 - accurately passes through this hole, further enhancing the stability of the connection. In addition, the shear key 7 is fixed to the upper surface of the cast steel lower connector 5 by welding, ensuring the excellent performance of the entire connection device when subjected to shear force.

[0049] This new design significantly enhances the shear resistance and overall stability of cast steel beam-column connections in modular buildings. The circular cross-section of the shear key, precisely aligned with the insertion hole, and the semicircular cross-section and through-hole design of the pin create a highly efficient force transmission mechanism, effectively dissipating shear forces and enhancing the stability of the connection. Furthermore, the welded connection between the shear key and the cast steel lower connector further strengthens the overall structure of the connection.

[0050] According to one embodiment of the present invention, the cast steel upper connector 3 and the cast steel lower connector 5 are both L-shaped cavity structures formed by integral casting; the connections between the ribs and the web flanges, and the connections between the webs and the flanges of the cast steel upper connector 3 and the cast steel lower connector 5 are chamfered.

[0051] In this embodiment, the cast steel upper connector 3 and the cast steel lower connector 5 both adopt an integrally cast L-shaped cavity structure design. This design not only enhances the rigidity and stability of the connector, but also facilitates precise docking with the square steel pipe column 1 and the H-shaped steel beam 2. The connection between the ribs and the web flange of the connector, as well as the connection between the web and the flange, are carefully chamfered. The presence of the chamfer not only optimizes the stress distribution of the connector and reduces stress concentration, but also increases the contact area when the connector is welded with other components, thereby enhancing the strength and sealing of the welded joint. This sophisticated structural design makes the connection between the cast steel connector and the square steel pipe column 1 and the H-shaped steel beam 2 tighter and more stable, effectively improving the bearing capacity and safety performance of the entire beam-column node.

[0052] The utility model significantly improves the performance and reliability of the cast steel connector by adopting an integrally cast L-shaped cavity structure and a chamfered design at the connection.

[0053] According to one embodiment of the present invention, a stiffening plate 6 is provided inside the cast steel upper connector 3 and the cast steel lower connector 5 in the direction of connection with the square steel pipe column 1 , and a construction operation hole 11 is provided on the stiffening plate 6 .

[0054] In this embodiment, the internal structural design of the cast steel upper connector 3 and the cast steel lower connector 5 fully considers the strength and convenience of connection with the square steel pipe column 1. Specifically, stiffening plates 6 are added to these two connectors in the direction of connection with the square steel pipe column 1. The addition of the stiffening plate 6 significantly enhances the bearing capacity and stability of the connector in this direction, ensuring that a stable connection can be formed between the connector and the square steel pipe column 1. In addition, in order to facilitate construction operations such as welding and bolt tightening, construction operation holes 11 are cleverly provided on the stiffening plate 6. These operation holes not only provide a convenient operating space for construction personnel, but also improve construction efficiency and quality. Through such a design, the connection relationship between the cast steel upper connector 3 and the cast steel lower connector 5 and the square steel pipe column 1 becomes tighter, more stable and easier to construct. When the square steel pipe column 1 is welded to the cast steel connector, the edge of the square steel pipe column 1 should be aligned with the stiffening plate 6.

[0055] The utility model effectively improves the connection strength and stability between the connector and the square steel pipe column by adding stiffening plates inside the cast steel upper connector and the cast steel lower connector and providing construction operation holes on the stiffening plates.

[0056] According to one embodiment of the present invention, reserved threading holes 10 are provided on the outer surface of the cast steel upper connector 3 , the outer surface of the cast steel lower connector 5 , and the connecting plate 4 .

[0057] In this embodiment, pre-set wire holes 10 are meticulously designed on the outer surfaces of the cast steel upper connector 3, the outer surfaces of the cast steel lower connector 5, and the connecting plate 4. These pre-set wire holes 10 are not only strategically positioned and precisely dimensioned, but also provide convenient access for subsequent electrical wiring layout. Through these pre-set holes, electrical wiring can smoothly pass through the connector, seamlessly integrating with the building's internal electrical system. This design not only simplifies the electrical wiring construction process but also improves the aesthetics and safety of the wiring, avoiding structural damage or safety hazards that could result from haphazardly opened holes.

[0058] The utility model realizes the perfect integration of electrical wiring and building structure by arranging reserved wire holes on cast steel connectors and connecting plates, which not only improves construction efficiency and reduces construction costs, but also enhances the integrity and safety of the electrical system inside the building.

[0059] Example 2

[0060] like Figure 1 As shown, according to one embodiment of the present invention, a modular building beam-column cast steel connection node includes a square steel tube column 1, an H-shaped steel beam 2 and a connection device, wherein the square steel tube column 1, the H-shaped steel beam 2 and the connection device are connected by welding.

[0061] like Figure 2As shown, the connecting device includes a cast steel upper connecting part 3, a cast steel lower connecting part 5, a connecting plate 4 placed between the cast steel connecting parts, a shear key 7 and a pin 8; the cast steel connecting parts (cast steel upper connecting part 3 and cast steel lower connecting part 5) are L-shaped cavity structures, which are cast as a whole, and chamfers are used at the connections between the ribs and the web flanges, and at the connections between the webs and the flanges; the lower surface of the cast steel upper connecting part 3 and the upper surface of the cast steel lower connecting part 5 are provided with local protrusions at the edges of the contact surfaces with the connecting plate 4, which serve to fix the connecting plate 4, and a stiffening plate 6 is provided inside the cast steel connecting part in the direction of connection with the column.

[0062] Preferably, shear key embedding holes 9 and reserved threading holes 10 are symmetrically provided on the upper and lower surfaces of the cast steel connector, and holes of the same size are provided at corresponding positions on the connecting plate 4 to facilitate the installation of shear keys 7 and water and electricity pipelines during construction.

[0063] Preferably, a semicircular construction operation hole 11 is provided on the stiffening plate 6 on one side of the cast steel upper connector 3 to facilitate inserting the pin 8 into the pin embedding hole 12 to fix the shear key 7 at the cast steel upper connector 3.

[0064] Preferably, the stiffening plates 6 of the cast steel lower connecting piece 5 are provided with circular construction operation holes 11 to facilitate welding and fixing the shear key 7 to the cast steel lower connecting piece 5 .

[0065] Preferably, if Figure 3 As shown, the shear key 7 is a cylinder provided with a pin embedding hole 12 with a semicircular cross section.

[0066] Preferably, the shear key 7 has a sufficient length so that after the pin 8 is embedded and welded, the cast steel upper connector 3, the connecting plate 4 and the cast steel lower connector 5 can be reliably connected.

[0067] Preferably, the length of the pin 8 is greater than the cross-sectional diameter of the shear key 7 .

[0068] This new design facilitates convenient construction and flexible assembly and disassembly within the module through its connection mechanism, addressing the issue of limited construction space. Furthermore, pre-set threading holes facilitate the installation of plumbing and electrical lines, promoting modularization of building functions. The optimized design of the cast steel connector effectively avoids stress concentration and welding defects, improving the stability and safety of the joints and resolving the problem of large cross-section weakening in traditional joints.

[0069] Example 3

[0070] like Figure 1-4 As shown, the manufacturing and construction process of a modular building beam-column cast steel connection node includes the following steps:

[0071] Step 1: Determine the sizes of cast steel connectors (including cast steel upper connector 3 and cast steel lower connector 5), connecting plates 4, shear keys 7 and various apertures based on the building layout and structural stress requirements; use software to draw a solid model of the cast steel connector, and simulate and analyze to predict node defects, optimize the casting process and processing technology; after casting is completed, the geometric dimensions, accuracy, defects, etc. of the components need to be inspected, and finally the cast steel connectors are welded to the beams and columns to form modules.

[0072] Step 2: hoist the module unit of the first floor on site, align the shear key embedding holes 9 of the connecting plate 4 and the cast steel lower connecting piece 5 with the reserved threading holes 10, and then insert the shear key 7.

[0073] Step 3: Hoist the upper module unit so that the shear key 7 is embedded in the cast steel upper connector 3, insert the pin 8 so that the upper surface of the pin 8 fits with the lower surface of the cast steel upper connector 3, and finally weld the shear key 7 to the upper surface of the cast steel lower connector 5 to complete the installation.

[0074] The utility model realizes the internal construction of the module through the innovative design of the cast steel connection node of the modular building beam and column, greatly improves the convenience of disassembly and assembly, and effectively solves the problem of limited construction space of the node between modules.

[0075] The carefully preset wire holes on the cast steel connector of this utility model provide great convenience for the installation of water and electricity pipelines, promote the modularization process at the functional level of fully-decorated buildings, and improve construction efficiency and flexibility.

[0076] The utility model adopts an integrally cast cast steel connection node, combined with the chamfer design of the connection between the rib and the web flange, and the web and the flange, which significantly reduces the risk of stress concentration and avoids the brittle failure of the node caused by welding defects, thereby solving the problem of excessive weakening of the traditional node cross section and enhancing the overall strength and durability of the node.

[0077] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0078] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A modular building beam-column cast steel connection node, comprising a square steel tube column (1) and an H-shaped steel beam (2), characterized in that: The connection node further comprises: a connection device; The square steel tube column (1) and the H-shaped steel beam (2) are fixedly connected via the connecting device; The connecting device comprises a cast steel upper connecting piece (3) and a cast steel lower connecting piece (5) connected up and down; the square steel pipe column (1) and the H-shaped steel beam (2) located at the upper part are respectively fixedly connected to the cast steel upper connecting piece (3), and the square steel pipe column (1) and the H-shaped steel beam (2) located at the lower part are respectively fixedly connected to the cast steel lower connecting piece (5); The connecting device further comprises: a connecting plate (4), a shear key (7), and a pin (8); The connecting plate (4) is arranged between the cast steel upper connecting piece (3) and the cast steel lower connecting piece (5); the shear key (7) passes through the connecting plate (4), and the two ends of the shear key (7) respectively pass through the connecting surfaces of the cast steel upper connecting piece (3) and the cast steel lower connecting piece (5); the pin (8) passes through the shear key (7) and fits with the lower surface of the cast steel upper connecting piece (3).

2. The modular building beam-column cast steel connection node according to claim 1, characterized in that: The lower surface of the cast steel upper connecting piece (3) and the upper surface of the cast steel lower connecting piece (5) are both provided with local protrusions at the edges of the contact surfaces with the connecting plate (4) for fixing the connecting plate (4).

3. The modular building beam-column cast steel connection node according to claim 1, characterized in that: Shear key embedding holes (9) are provided at corresponding positions on the outer surfaces of the cast steel upper connector (3), the cast steel lower connector (5) and the connecting plate (4); the size of the shear key (7) matches the shear key embedding hole (9), and the shear key (7) passes through the shear key embedding hole (9) to connect the cast steel upper connector (3), the cast steel lower connector (5) and the connecting plate (4).

4. The modular building beam-column cast steel connection node according to claim 3, characterized in that: The transverse cross-section of the shear key (7) is circular; a pin embedding hole (12) is transversely provided on the shear key (7); the length of the pin (8) is greater than the diameter of the shear key (7), and the pin (8) passes through the pin embedding hole (12); the shear key (7) and the upper surface of the cast steel lower connecting piece (5) are fixed by welding.

5. The modular building beam-column cast steel connection node according to claim 4, characterized in that: The longitudinal cross section of the pin (8) is semicircular.

6. The modular building beam-column cast steel connection node according to claim 1, characterized in that: The cast steel upper connecting piece (3) and the cast steel lower connecting piece (5) are both L-shaped cavity structures formed by integral casting; the connections between the ribs and the web flanges, and the connections between the webs and the flanges of the cast steel upper connecting piece (3) and the cast steel lower connecting piece (5) are both chamfered.

7. The modular building beam-column cast steel connection node according to claim 6, characterized in that: A stiffening plate (6) is provided inside the cast steel upper connecting piece (3) and the cast steel lower connecting piece (5) in the direction of connection with the square steel pipe column (1), and a construction operation hole (11) is provided on the stiffening plate (6).

8. The modular building beam-column cast steel connection node according to claim 6, characterized in that: Reserved threading holes (10) are provided on the outer surface of the cast steel upper connecting piece (3), the outer surface of the cast steel lower connecting piece (5), and the connecting plate (4).

9. The modular building beam-column cast steel connection node according to claim 1, characterized in that: The square steel pipe column (1) and the H-shaped steel beam (2) are respectively connected to adjacent cast steel connecting pieces by welding.

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