Modular steel structure middle bolt connection node of box plate-pin connection and construction method

Abstract

The application provides a box-plate-pin connection modular steel structure middle bolt connection node and a construction method, which comprises the following steps: middle plate-pin connection, upper box connection unit, lower box connection unit, beam lining tube unit and module beam unit; the middle plate-pin connection comprises a center round bar, four bolts, a horizontal plate and four vertical plates; the upper box connection unit and the lower box connection unit are connected through the middle plate-pin connection, are symmetrical and have the same structure; the lower box connection unit comprises four box connection units which are sequentially arranged and symmetrically arranged and comprises a square plate, an L-shaped folding plate, an arc bending plate, a hole plate and a round steel pipe; the beam lining tube unit comprises eight upper beam lining tubes and eight lower beam lining tubes; and the module beam unit comprises eight lower module ceiling beams and eight upper module floor beams. The application can realize factory fine manufacturing, on-site full assembly installation and disassembly of the modular steel structure node.

Description

Technical Field

[0001] This invention belongs to the field of modular structure nodes, and particularly relates to a bolted connection node in the middle of a modular steel structure with a box-plate-pin connection and a construction method thereof. Background Technology

[0002] Modular structure is a new type of prefabricated steel structure building that adopts integrated design, standardized production, and prefabricated construction. The modular structural system consists of multiple modular units connected by modular nodes. Modular structures offer high completion and integration, reliable construction quality, and stable acceleration of project progress, maximizing production efficiency. Modular buildings reduce the overall life-cycle cost of buildings due to their advantages of off-site standardized production and short construction time. As a new type of building structure, modular structure has significant advantages such as green and low-carbon development, sustainable development, and recycling, representing a new model for the development of prefabricated buildings. The modular structural system consists of multiple independent modular units connected by modular nodes, which are the key points and core of the modular structural system.

[0003] At present, the research on modular steel structure connection nodes by scholars at home and abroad is not yet mature, and the current modular connection nodes also have various shortcomings, such as: 1) the modular node connection design does not have compatibility with multiple node connection forms; 2) the modular node area needs to be welded for reinforcement, and it has not achieved 100% assembly; 3) the modular node design is not simple and direct enough in terms of force transmission, and it is difficult to adapt to the development needs of modular structures for high-rise buildings. Summary of the Invention

[0004] The purpose of this invention is to provide a bolted connection node and construction method for the middle section of a modular steel structure with box-plate-pin connections, enabling fully assembled on-site operations and disassembly and recycling. To achieve the above objective, this invention adopts the following technical solution:

[0005] A modular steel structure with a box-plate-pin connection and a central bolted connection node, comprising:

[0006] The intermediate plate-pin connector includes a central round bar, four pins, a horizontal plate, and four vertical plates. The pins are symmetrical about the vertical plates. The horizontal plates have holes at the four pin positioning holes for welding with the pins. The horizontal plate has an opening at its center for welding with the central round bar. The upper and lower surfaces of the horizontal plates are symmetrical about the upper and lower surfaces of the central round bar.

[0007] The four vertical plates have symmetrical elongated holes at the top and bottom to mate with the sides of the modular beam unit. A groove is cut in the center of each vertical plate to insert into a horizontal plate and contact the central round bar. The three are welded together to form a whole. The outer surfaces of the four vertical plates overlap with the corresponding outer surfaces of the horizontal plates. The four vertical plates are perpendicular to each other and symmetrically centered.

[0008] The upper box-type connector unit and the lower box-type connector unit are connected vertically, horizontally, and vertically via a middle plate-pin connector, and have the same structure. Each lower box-type connector unit includes four symmetrically arranged lower box-type connectors. These four lower box-type connectors form a hole space for assembling the lower section of the middle plate-pin connector. Each lower box-type connector includes:

[0009] A square plate, perpendicular to the axis of the module column, is welded to the module column;

[0010] An L-shaped folded plate is perpendicular to the axis of the module beam. The outer side of the L-shaped folded plate is welded to a module beam. The bottom surface of the L-shaped folded plate is welded to a square plate, and the outer side of the L-shaped folded plate coincides with the outer side of the square plate.

[0011] An arc-shaped plate is perpendicular to the axis of the module beam. The bottom surface of the arc-shaped plate is welded to a square plate, the thickness direction surface of the arc-shaped plate is welded to the inner side of an L-shaped folded plate, and the outer side of the arc-shaped plate coincides with the outer side of the square plate.

[0012] A perforated plate, parallel to a square plate, the outer side of the perforated plate being welded to an arc-shaped plate and an L-shaped folded plate; the outer surface of the perforated plate coincides with the top surface of the arc-shaped plate;

[0013] A round steel pipe, perpendicular to a square plate, has its bottom surface welded to the directional plate; its top surface coincides with the outer surface of the perforated plate; its side surface is welded to the inner surface of the perforated plate; and the round steel pipe is used to engage with a pin in a middle plate-pin connector.

[0014] The beam liner unit includes eight upper beam liners and eight lower beam liners. The upper beam liners and lower beam liners have the same structure. The lower beam liners have concentric operating holes of the same size on both sides. The lower beam liners are welded to the outer side of the L-shaped folded plate. The outer surface of the lower beam liners is in contact with the inner surface of the lower module ceiling beam of the modular beam unit.

[0015] The modular beam unit includes eight lower modular ceiling beams and eight upper modular floor beams. The upper modular floor beams and lower modular ceiling beams have the same structure. The lower modular ceiling beams have bolt holes on their outer side and operating holes on their inner side. The two holes are concentric and mate with the operating holes of the lower beam liner and the elongated holes of the vertical plate. The lower modular ceiling beams are welded to the outer side of the L-shaped folded plate. The inner surface of the lower modular ceiling beams is in contact with the outer surface of the lower beam liner.

[0016] Preferably, after the middle plate-pin connector, the upper box connector, and the lower box connector are installed, the pin of the middle plate-pin connector is positioned and engaged with the steel pipe of the upper box connector and the lower box connector, respectively.

[0017] Preferably, after the middle plate-pin connector, the upper box connector, and the lower box connector are installed, the upper surface of the middle plate-pin connector contacts the opening plate of the upper box connector, and the lower surface of the middle plate-pin connector contacts the opening plate of the lower box connector.

[0018] Preferably, after the middle plate-pin connector, upper box connector, and lower box connector are installed, the inner surface of the vertical plate coincides with the outer surface of the curved plate of the upper and lower box connectors and the outer surface of the modular beam unit.

[0019] Preferably, the upper box-type connector and the lower box-type connector are arranged symmetrically.

[0020] Preferably, the beam liner unit is made of a square tubular component.

[0021] Preferably, the modular beam, upper modular column, and lower modular column are all made of square tubular components.

[0022] Preferably, the strength grade of the modular beam unit is Q235, Q355, Q390 or Q420.

[0023] A construction method for a bolted connection node in the middle of a modular steel structure with a box-plate-pin connection includes the following steps:

[0024] (1) Weld the upper box-type connector unit and the lower box-type connector unit:

[0025] The lower box connector unit includes four lower box connectors, and the upper box connector unit includes four upper box connectors.

[0026] When welding the lower box-type connector: First, weld an arc-bent plate and an L-shaped folded plate onto the square plate, with the outer sides of the three overlapping; then weld the vertical side of the arc-bent plate in the thickness direction to the inner side of the L-shaped folded plate; then weld the outer side of the perforated plate to the inner side of the L-shaped folded plate and the arc-bent plate; finally, weld the side of the round steel pipe to the inner side of the perforated plate and the bottom to the square plate.

[0027] (2) Welded beam liner unit:

[0028] The beam liner unit includes a lower beam liner and an upper beam liner;

[0029] In the lower box-type connector, a lower beam liner is welded to the outer surface of the L-shaped folding plate, and in the upper box-type connector, an upper beam liner is welded to the outer surface of the L-shaped folding plate.

[0030] (3) Welded modular beam unit:

[0031] The modular beam unit includes a lower modular ceiling beam and an upper modular floor beam;

[0032] A lower module ceiling beam is welded to the outer surface of the L-shaped folding plate in the lower box connector, and an upper module floor beam is welded to the outer surface of the L-shaped folding plate in the upper box connector; the inner surface of the module beam is in contact with the outer surface of the beam liner.

[0033] (4) Welding the lower module column and the upper module column:

[0034] A top module column is welded to the top surface of the square plate in the upper box connector, and a bottom module column is welded to the bottom surface of the square plate in the lower box connector.

[0035] (5) Welding intermediate plate-pin connector:

[0036] Holes are made at the four pin positioning holes of the horizontal plate and welded to the pins. Then, a hole is made at the center of the horizontal plate and welded to the central round bar. Finally, slots are made in the middle of the four vertical plates, which are inserted into the horizontal plate and contact the central round bar. The three are welded together to form a whole. The four vertical plates are arranged orthogonally, with an included angle of 90 degrees between each pair.

[0037] (6) Assemble the lower box-type connector unit:

[0038] The four lower box-type connectors are symmetrically assembled to form a lower box-type connector unit;

[0039] (7) Install the intermediate plate-pin connector:

[0040] Insert the lower section of the pin of the middle plate-pin connector into the steel pipe hole of the lower box connector, and then connect the elongated hole of the vertical plate of the middle plate-pin connector and the bolt hole on the outer side of the ceiling beam of the lower module with the lower bolt.

[0041] (8) Install the upper box-type connector unit:

[0042] The four upper box-type connectors are symmetrically assembled to form an upper box-type connector unit; then, the upper part of the pin of the middle plate-pin connector is inserted into the steel pipe hole of the upper box-type connector, and then the oblong hole of the vertical plate of the middle plate-pin connector and the bolt hole on the outer side of the upper module floor beam are connected by the upper bolts.

[0043] Compared with the prior art, the advantages of the present invention are:

[0044] (1) The connection node can be connected by simply positioning the eight modular units with pins. The bolts on the outer side of the modular beam and the vertical plate further ensure the integrity and stress symmetry of the node domain.

[0045] (2) The connection node realizes modular construction operation. The upper box-type connector, the lower box-type connector and the middle plate-pin connector are connected by pin positioning and bolts. The inner lining beam liner at the bolt hand hole is structurally reinforced. In addition, no welding reinforcement is required.

[0046] (3) The upper box connector, the lower box connector and the middle plate-pin connector can all be disassembled, thereby realizing the modular node recycling.

[0047] (4) The connection nodes expand the applicability of modular units and increase their stability. The connection nodes can further expand the connection of modular multi-story permanent buildings, laying the foundation for the diversification of modular structural systems and the standardization and normalization of products; in addition, the modular structure conforms to the design and development concept of green building; the connection nodes and steel structure modular units can be prefabricated in advance, and the structural system can be completely recycled. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of a modular overall structure according to an embodiment of the present invention;

[0049] Figure 2 A schematic diagram of a bolted connection node in the middle of a modular steel structure with a box-plate-pin connection;

[0050] Figure 3 An exploded view of the bolted connection node in the middle of a modular steel structure with box-type plate-pin connections;

[0051] Figure 4 This is a schematic diagram of the installation of the lower module unit;

[0052] Figure 5 This is an exploded view of the box-type connector;

[0053] Figure 6 This is a 3D schematic diagram of the intermediate plate-pin connector;

[0054] Figure 7 This is an exploded view of the intermediate plate-pin connector;

[0055] Among them, 1-upper module column, 2-lower module column, 3-upper module floor beam, 4-lower module ceiling beam, 5-upper beam liner, 6-lower beam liner, 7-upper box-type connector, 8-lower box-type connector, 9-center round bar, 10-pin, 11-horizontal plate, 12-vertical plate, 13-upper bolt, 14-lower bolt. Implementation

[0056] The present invention will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0057] like Figures 1-7 As shown, a modular steel structure edge bolt connection node with box-type plate-pin connection includes: a middle plate-pin connector, an upper box-type connector unit, a lower box-type connector unit, a beam liner unit, and a modular beam unit.

[0058] like Figures 6-7 As shown, the intermediate plate-pin connector includes a central round bar 9, four pins 10, a horizontal plate 11, and four vertical plates 12, an upper bolt 13, and a lower bolt 14. The modular beam unit, the upper modular column 1, and the lower modular column 2 are all made of square tubular components.

[0059] The intermediate plate-pin connector includes a central round bar 9, four pins 10, a horizontal plate 11, and four vertical plates 12. The pins 10 are symmetrical about each other with respect to the vertical plates 12, and their ends are chamfered for easy installation. The horizontal plate 11 has holes at the positioning holes of the four pins 10 for welding with the pins 10. The horizontal plate 11 has an opening at its center for welding with the central round bar 9. The upper and lower surfaces of the horizontal plate 11 are symmetrical about the upper and lower surfaces of the central round bar 9.

[0060] The four vertical plates 12 have symmetrical elongated holes at their top and bottom to mate with the sides of the modular beam unit. The four vertical plates 12 have grooves in their middle, into which the horizontal plate 11 is inserted and contacts the central round bar 9. The three are welded together to form a whole. The outer surfaces 12 of the four vertical plates overlap with the corresponding outer surfaces of the horizontal plate 11. The four vertical plates 12 are perpendicular to each other and symmetrically centered.

[0061] The upper box-type connector unit and the lower box-type connector unit are connected in all directions via a middle plate-pin connector, and have the same structure. The lower box-type connector unit includes four symmetrically arranged lower box-type connectors 8; the four lower box-type connectors 8 form a hole space for assembling the lower section of the middle plate-pin connector.

[0062] like Figures 4-5 As shown, the lower box-type connector 8 includes:

[0063] A square plate 8-5 is perpendicular to the axis of the module column, and the square plate 8-5 is welded to the module column 2;

[0064] An L-shaped folded plate 8-2 is perpendicular to the axis of the module beam 4. The outer side of the L-shaped folded plate 8-2 is welded to a module beam 4. The bottom surface of the L-shaped folded plate 8-2 is welded to a square plate 8-5. The outer side of the L-shaped folded plate coincides with the outer side of the square plate.

[0065] An arc-bent plate 8-1 is perpendicular to the axis of the module beam. The bottom surface of the arc-bent plate 8-1 is welded to the square plate 8-5. The thickness direction vertical surface of the arc-bent plate 8-1 is welded to the inner side of the L-shaped folded plate 8-2. The outer side of the arc-bent plate 8-1 coincides with the outer side of the square plate 8-5.

[0066] A perforated plate 8-3 is parallel to a square plate 8-2. The outer side of the perforated plate 8-3 is welded to the curved plate 8-1 and the L-shaped folded plate 8-2. The outer surface 8-3 of the perforated plate coincides with the top surface 8-1 of the curved plate.

[0067] A round steel pipe 8-4 is perpendicular to a square plate 8-5. The bottom surface of the round steel pipe 8-4 is welded to the square plate 8-5. The top surface of the round steel pipe 8-4 coincides with the outer surface 8-3 of the perforated plate, meaning that the round steel pipe 8-4 and the perforated plate 8-3 are connected. The side surface of the round steel pipe 8-4 is welded to the inner side surface of the perforated plate 8-3. The round steel pipe 8-4 is used to cooperate with the pin 10 of the intermediate plate-pin connector 9-12.

[0068] The beam liner unit includes eight upper beam liners 5 and eight lower beam liners 6. The upper beam liners 5 and lower beam liners 6 have the same structure. The lower beam liners 6 have concentric operating holes of the same size on both sides. The lower beam liners 6 are welded to the outer side of the L-shaped folding plate 8-2. The outer surface of the lower beam liners 6 is in close contact with the inner surface of the lower module ceiling beam 4.

[0069] The modular beam unit includes eight upper modular floor beams 3 and eight lower modular ceiling beams 4. The upper modular floor beams 3 and the lower modular ceiling beams 4 have the same structure. The lower modular ceiling beams 4 have bolt holes on their outer side and operating holes on their inner side. The two holes are concentric and mate with the operating holes of the lower beam liner 6 and the elongated holes of the vertical plate 12. The lower modular ceiling beams 4 of the modular beam unit are welded to the outer side of the L-shaped folding plate 8-2. The inner surface of the lower modular ceiling beams 4 is in close contact with the outer surface of the lower beam liner 6.

[0070] The upper modular unit consists of the upper multi-directional connector unit, the upper modular floor beam 3, and the upper modular column 1; the lower modular unit consists of the lower multi-directional connector unit, the lower modular ceiling beam 4, and the lower modular column 2. All welding connections are pre-installed in the factory. Both the upper and lower modular units are steel components, symmetrical about their contact surfaces. The upper and lower modular units are in close contact, ensuring the integrity of the node area and meeting the structural load-bearing performance requirements.

[0071] In this embodiment, the strength grades of the upper modular floor beam 3 and the lower modular ceiling beam 4 in the modular beam unit are Q235, Q355, Q390 or Q420; the strength grades of the upper modular column 1 and the lower modular column 2 are Q235, Q355, Q390 or Q420; the strength grades of the upper box-type connector 7 and the lower box-type connector 8 can be Q235, Q355, Q390 or Q420; and the strength grades of the intermediate plate-pin connector are Q235, Q355, Q390 or Q420.

[0072] The construction method for the bolted connection node in the middle of the modular steel structure with box-plate-pin connection includes steps (1) to (8), as follows:

[0073] (1) Weld the upper box-type connector unit and the lower box-type connector unit:

[0074] The lower box connector unit includes four lower box connectors 8, and the upper box connector unit includes four upper box connectors 7.

[0075] When welding the lower box-type connector, firstly, weld an arc-bent plate 8-1 and an L-shaped folded plate 8-2 onto the square plate 8-5, with the outer sides of all three overlapping; then weld the thickness-direction vertical side of the arc-bent plate 8-1 to the inner side of the L-shaped folded plate 8-2; then weld the outer side of the perforated plate 8-3 to the inner side of the L-shaped folded plate 8-2 and the arc-bent plate 8-1; finally, weld the side of the round steel pipe 8-4 to the inner side of the perforated plate 8-3, and the bottom to the square plate 8-5.

[0076] (2) Welded beam liner unit:

[0077] The beam liner unit includes a lower beam liner 6 and an upper beam liner 5;

[0078] In the lower box-type connector 8, a lower beam liner 6 is welded to the outer surface of the L-shaped folding plate 8-2, and in the upper box-type connector 7, an upper beam liner 5 is welded to the outer surface of the L-shaped folding plate 7-2.

[0079] (3) Welded modular beam unit:

[0080] The modular beam unit includes a lower modular ceiling beam 4 and an upper modular floor beam 3;

[0081] A lower module ceiling beam 4 is welded to the outer surface of the L-shaped folding plate 8-2 in the lower box-type connector 8, and an upper module floor beam 3 is welded to the outer surface of the L-shaped folding plate 8-2 in the upper box-type connector 7; the inner surface of the module beam is in close contact with the outer surface of the beam liner. That is, the upper module floor beam 3 is in close contact with the outer surface of the upper beam liner 5, and the lower module ceiling beam 4 is in close contact with the outer surface of the outer beam liner 6.

[0082] (4) Welding the lower module column and the upper module column:

[0083] A top module column 1 is welded to the top surface of the square plate in the upper box connector 7, and a bottom module column 2 is welded to the bottom surface of the square plate 8-5 in the lower box connector 8.

[0084] (5) Welding intermediate plate-pin connector:

[0085] Holes are made at the four pin positioning holes of the horizontal plate 11 and welded to the pins 10. Then, a hole is made at the center of the horizontal plate 11 and welded to the central round bar 9. Finally, slots are made in the middle of the four vertical plates 12, which are inserted into the horizontal plate 11 and contact the central round bar 9. The three are welded together to form a whole. The four vertical plates 12 are arranged orthogonally, with an included angle of 90 degrees between each pair.

[0086] (6) Assemble the lower box-type connector unit:

[0087] The four lower box-type connectors are symmetrically assembled to form a lower box-type connector unit;

[0088] (7) Install the intermediate plate-pin connector:

[0089] Insert the lower section of the pin 10 of the intermediate plate-pin connector into the holes 8-4 of the steel pipes of each lower box-type connector 8. Then, connect the elongated hole of the vertical plate 12 of the intermediate plate-pin connector to the bolt hole on the outer side of the lower module ceiling beam 4 using the lower bolt 14. The lower section of each vertical plate 12 is located within the gap formed by the 8 lower module ceiling beams 4, and the upper section of each vertical plate 12 is located within the gap formed by the 8 upper module floor beams 3.

[0090] (8) Install the upper box-type connector unit:

[0091] The four upper box-type connectors 7 are symmetrically assembled to form an upper box-type connector unit; then, the upper part of the pin 10 of the middle plate-pin connector is inserted into the steel pipe hole of each upper box-type connector 7, and then the oblong hole of the vertical plate 12 of the middle plate-pin connector and the bolt hole on the outer side of the upper module floor beam 3 are connected by the upper bolt 13.

[0092] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the protection scope of the present invention.

Claims

1. A modular steel construction mid-panel-pin connected joint in a cassette, characterized by, include: The intermediate plate-pin connector includes a central round bar, four pins, a horizontal plate, and four vertical plates, wherein the pins are symmetrical about the vertical plates. The horizontal plate has holes at four pin positioning holes for welding with the pins, and the opening at the center of the horizontal plate is welded to the central round bar; the upper and lower surfaces of the horizontal plate are symmetrical about the upper and lower surfaces of the central round bar. The four vertical plates have symmetrical elongated holes at the top and bottom to fit with the sides of the modular beam unit. The four vertical plates have grooves in the middle to insert into the horizontal plate and contact the central round bar. The three are welded together to form a whole. The outer sides of the four vertical plates coincide with the corresponding outer sides of the horizontal plate. The four vertical plates are perpendicular to each other and symmetrically centered. The upper box-type connector unit and the lower box-type connector unit are connected in the upper, lower, left and right directions by a middle plate-pin connector. They have the same structure. The lower box-type connector unit includes four symmetrically arranged lower box-type connectors. The four lower box-type connectors form the hole space for assembling the lower section of the intermediate plate-pin connector, and the lower box-type connectors include: A square plate, perpendicular to the axis of the module column, is welded to the module column; An L-shaped folded plate is perpendicular to the axis of the module beam. The outer side of the L-shaped folded plate is welded to a module beam. The bottom surface of the L-shaped folded plate is welded to a square plate, and the outer side of the L-shaped folded plate coincides with the outer side of the square plate. An arc-shaped plate is perpendicular to the axis of the module beam. The bottom surface of the arc-shaped plate is welded to a square plate, the thickness direction surface of the arc-shaped plate is welded to the inner side of an L-shaped folded plate, and the outer side of the arc-shaped plate coincides with the outer side of the square plate. A perforated plate, parallel to a square plate, the outer side of the perforated plate being welded to an arc-shaped plate and an L-shaped folded plate; the outer surface of the perforated plate coincides with the top surface of the arc-shaped plate; A round steel pipe, perpendicular to a square plate, has its bottom surface welded to the directional plate; its top surface coincides with the outer surface of the perforated plate; its side surface is welded to the inner surface of the perforated plate; and the round steel pipe is used to engage with a pin in a middle plate-pin connector. The beam liner unit includes eight upper beam liners and eight lower beam liners. The upper beam liners and lower beam liners have the same structure. The lower beam liners have concentric operating holes of the same size on both sides. The lower beam liners are welded to the outer side of the L-shaped folded plate. The outer surface of the lower beam liners is in contact with the inner surface of the lower module ceiling beam of the modular beam unit. The modular beam unit includes eight lower modular ceiling beams and eight upper modular floor beams. The upper modular floor beams and lower modular ceiling beams have the same structure. The lower modular ceiling beams have bolt holes on their outer side and operating holes on their inner side. The two holes are concentric and mate with the operating holes of the lower beam liner and the elongated holes of the vertical plate. The lower modular ceiling beams are welded to the outer side of the L-shaped folded plate. The inner surface of the lower modular ceiling beams is in contact with the outer surface of the lower beam liner.

2. The modular steel construction mid-panel-pin connected node of claim 1, wherein, After the middle plate-pin connector, upper box connector, and lower box connector are installed, the pin of the middle plate-pin connector is positioned and engaged with the steel pipe of the upper box connector and the lower box connector, respectively.

3. The modular steel construction mid-panel-pin connected node of claim 1, wherein, After the middle plate-pin connector, the upper box connector, and the lower box connector are installed, the upper surface of the middle plate-pin connector contacts the opening plate of the upper box connector, and the lower surface of the middle plate-pin connector contacts the opening plate of the lower box connector.

4. The modular steel construction mid-panel-pin connected node of claim 1, wherein, After the middle plate-pin connector, upper box connector, and lower box connector are installed, the inner surface of the vertical plate coincides with the outer surface of the curved plate of the upper and lower box connectors and the outer surface of the module beam unit.

5. The modular steel construction mid-panel-pin connected node of claim 1, wherein, The upper box-type connector unit and the lower box-type connector unit are arranged symmetrically on top of each other.

6. The modular steel construction mid-panel-pin connected node of claim 1, wherein, The beam liner unit is made of square tubular components.

7. The modular steel construction mid-panel-pin connected node of claim 1, wherein, The modular beams, upper modular columns, and lower modular columns are all made of square tubular components.

8. The modular steel construction mid-panel-pin connected node of claim 1, wherein, The strength grade of the modular beam unit is Q235, Q355, Q390 or Q420.

9. A method of construction of a modular steel structure mid-panel bolted connection node of the box-pin connection type, characterized in that, Includes the following steps: (1) Weld the upper box-type connector unit and the lower box-type connector unit: The lower box connector unit includes four lower box connectors, and the upper box connector unit includes four upper box connectors. When welding the lower box-type connector: First, weld an arc-bent plate and an L-shaped folded plate onto the square plate, with the outer sides of the three overlapping; then weld the vertical side of the arc-bent plate in the thickness direction to the inner side of the L-shaped folded plate; then weld the outer side of the perforated plate to the inner side of the L-shaped folded plate and the arc-bent plate; finally, weld the side of the round steel pipe to the inner side of the perforated plate and the bottom to the square plate. (2) Welded beam liner unit: The beam liner unit includes a lower beam liner and an upper beam liner; In the lower box-type connector, a lower beam liner is welded to the outer surface of the L-shaped folding plate, and in the upper box-type connector, an upper beam liner is welded to the outer surface of the L-shaped folding plate. (3) Welded modular beam unit: The modular beam unit includes a lower modular ceiling beam and an upper modular floor beam; A lower module ceiling beam is welded to the outer surface of the L-shaped folding plate in the lower box connector, and an upper module floor beam is welded to the outer surface of the L-shaped folding plate in the upper box connector; the inner surface of the module beam is in contact with the outer surface of the beam liner. (4) Welding the lower module column and the upper module column: A top module column is welded to the top surface of the square plate in the upper box connector, and a bottom module column is welded to the bottom surface of the square plate in the lower box connector. (5) Welding intermediate plate-pin connector: Holes are made at the four pin positioning holes of the horizontal plate and welded to the pins. Then, a hole is made at the center of the horizontal plate and welded to the central round bar. Finally, slots are made in the middle of the four vertical plates, which are inserted into the horizontal plate and contact the central round bar. The three are welded together to form a whole. The four vertical plates are arranged orthogonally, with an included angle of 90 degrees between each pair. (6) Assemble the lower box-type connector unit: The four lower box-type connectors are symmetrically assembled to form a lower box-type connector unit; (7) Install the intermediate plate-pin connector: Insert the lower section of the pin of the middle plate-pin connector into the steel pipe hole of the lower box connector, and then connect the elongated hole of the vertical plate of the middle plate-pin connector and the bolt hole on the outer side of the ceiling beam of the lower module with the lower bolt. (8) Install the upper box-type connector unit: The upper four box connectors are symmetrically combined to form an upper box connector unit; then, the upper section of the bolt of the middle plate-bolt connector is placed into the steel pipe hole of the upper box connector, and then the long circular hole of the vertical plate of the middle plate-bolt connector is connected with the upper bolt hole on the outer side of the upper module floor beam through the upper bolt.

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