Modular steel structure self-resetting pull rod-bolt connecting joint and construction method

Abstract

The application discloses a construction method of a modular steel structure self-resetting pull rod-bolt connecting joint, which comprises a lower corner box and an upper corner box, the lower corner box is connected between a module column and a module beam of an upper layer module, and the upper corner box is connected between a module column and a module beam of a lower layer module; a self-resetting component is installed between the module column and the module beam and is arranged in an inclined mode, the connection positions of the self-resetting component with the module column and the module beam are connected through column SMA bolts and beam SMA bolts respectively; the upper layer module and the lower layer module are connected into an integrated whole through a pull rod and a connecting sleeve. The connecting joint adopts the pull rod and the connecting sleeve, so that the whole building is connected into an integrated whole in the vertical direction, the vertical force transmission is continuous, holes do not need to be opened in the module column and the module beam during construction, and the cross section is prevented from being weakened; the upper corner box and the lower corner box adopt high-strength steel materials and can be applied to high-rise modular buildings.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a modular steel structure self-resetting tie rod-bolt connection node and construction method. Background Technology

[0002] With the development of industrialized construction, steel structure modular buildings have been widely used due to their advantages such as fast construction speed and high structural stability. In steel structure modular buildings, the connection quality between modules directly affects the overall performance and safety of the building.

[0003] Existing steel structure modular building connection methods mainly include welding, bolting, and a combination of welding and bolting. These connection methods have significant shortcomings in terms of vertical force transmission continuity, detachability, and seismic performance.

[0004] While welding can provide high connection strength and force transmission performance, it requires high welding technology and quality in on-site construction, is difficult to construct and control, and is extremely inconvenient to disassemble, especially when repair or replacement of parts is needed.

[0005] Bolted connections are relatively simple to construct and easy to disassemble and maintain, but their vertical force transmission continuity is often not as good as that of welded connections, which affects the stability and safety of the overall structure.

[0006] While welding and bolting combine the advantages of both methods, the construction process is complex, on-site operation is inconvenient, and disassembly is also difficult.

[0007] Existing node connection methods are complex in structure, have numerous components, and require high installation precision. They also cause severe frame deformation during earthquakes, increasing construction difficulty and time, raising construction costs, and hindering the promotion and application of steel structure modular buildings.

[0008] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a modular steel structure self-resetting tie rod-bolt connection node and construction method. Summary of the Invention

[0009] The purpose of this invention is to provide a modular steel structure self-resetting tie rod-bolt connection node and construction method. The aim is to overcome the shortcomings of existing connection nodes and propose a new type of connection node that enables continuous vertical force transmission throughout the building, is suitable for corner columns, side columns and central columns, has good self-resetting ability after earthquakes, and can be disassembled and reinstalled after the building is finished, thus adapting to the current development concept of green building.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] The present invention provides a modular steel structure self-resetting tie rod-bolt connection node, the connection node comprising:

[0012] The lower corner box and the upper corner box are connected between the module columns and module beams of the upper module, and the upper corner box is connected between the module columns and module beams of the lower module.

[0013] A self-resetting assembly is installed between the module column and the module beam and is arranged at an angle. The connection between the self-resetting assembly and the module column and the module beam is respectively connected by column SMA bolts and beam SMA bolts.

[0014] The upper and lower modules are connected as one unit by tie rods and connecting sleeves.

[0015] Furthermore, the top surface of the lower corner box is welded and fixed to the module column of the upper module, and the lower corner box has a pre-drilled corner box pull rod hole, and the side of the lower corner box is welded and fixed to the module beam of the upper module.

[0016] The lower corner box has a lower corner box extension that protrudes to one side, and the lower corner box extension is provided with a lower corner box long bolt hole;

[0017] The lower corner box is provided with an inner partition plate inside the connection position between the lower corner box and the module column, as well as between the long bolt holes of the lower corner box.

[0018] Furthermore, the upper corner box and the lower corner box have the same structure, but are installed in different positions;

[0019] The top surface of the upper corner box is provided with a flat-head bolt hole for the upper corner box, and a nut box is welded to one side inside the flat-head bolt hole for the upper corner box, and the nut box contains a nut;

[0020] The upper corner box has a long bolt hole at the position where it matches the lower corner box's long bolt hole, and a nut box is welded to the upper corner box's long bolt hole on the bottom surface of the upper corner box, with a nut inside the nut box.

[0021] Furthermore, the pull rod is placed inside the module column, and both the upper and lower ends of the pull rod have pull rod threads, and the upper end of the pull rod has a hexagonal pull rod rotating head;

[0022] A T-shaped wrench is provided to cooperate with the pull rod, and the T-shaped wrench cooperates with the pull rod rotating head to tighten the pull rod;

[0023] The connecting sleeve includes:

[0024] A connecting cylinder, which is connected to the tie rods of the upper and lower modules respectively, has an internal thread to achieve a threaded connection with the tie rod thread; and

[0025] A connecting sleeve fixing plate is formed between the two connecting cylinders, and the connecting sleeve fixing plate is a square plate with connecting sleeve flat head bolt holes at the four corners.

[0026] Furthermore, a connecting plate is provided between the upper and lower modules, and the connecting plate has a square hole that mates with the connecting sleeve fixing plate, and long bolt holes are reserved at both ends of the connecting plate;

[0027] The thickness of the connecting sleeve fixing plate is less than the thickness of the connecting plate;

[0028] A corrugated gasket is provided on the contact surface between the connecting sleeve fixing plate and the upper corner box.

[0029] Furthermore, the lower corner box, the connecting plate, and the upper corner box are connected by a long bolt, and the length of the long bolt is greater than the sum of the height of the lower corner box, the thickness of the connecting plate, and the height of the upper corner box;

[0030] The long bolt passes through the lower corner box, the connecting plate, and the upper corner box from top to bottom, and connects to the nut inside the nut box welded to the upper corner box.

[0031] Furthermore, stiffening ribs are welded and fixed between the module column and the corner box surface, and the self-resetting assembly includes:

[0032] Self-resetting component mounting plate;

[0033] A self-resetting assembly intermediate plate connected between the two self-resetting assembly fixing plates; and

[0034] Self-resetting component end plates installed on both sides of the middle plate of the self-resetting component;

[0035] The self-resetting component intermediate plate and the self-resetting component end plate are assembled through a deformable structure.

[0036] Furthermore, the deformable structure includes a deformable bolt, and the deformable bolt has a spring and a washer near its end;

[0037] SMA wire is connected between the ends of the two deformable bolts.

[0038] Furthermore, a middle plate groove is formed on the surface of the self-resetting component middle plate and the self-resetting component end plate at the mating position, and an end plate groove is formed on the side of the self-resetting component end plate that mates with the self-resetting component middle plate.

[0039] The self-resetting component intermediate plate and the self-resetting component end plate are respectively provided with intermediate plate slots and end plate slots;

[0040] The deformable bolt passes through the slot in the intermediate plate and the slot in the end plate.

[0041] This invention discloses a construction method for a modular steel structure self-resetting tie rod-bolt connection node. The construction method for the modular steel structure self-resetting tie rod-bolt connection node mainly includes the following steps:

[0042] S1. Fabricate modular columns, modular beams, self-resetting components, upper corner boxes, lower corner boxes, tie rods, connecting sleeves, connecting plates, long bolts, nuts, and stiffening ribs respectively;

[0043] S2. In the factory, weld the modular beams to both ends of the lower corner box and the upper corner box, weld the modular columns to the top and bottom surfaces of the lower corner box and the upper corner box, and weld the two right-angled sides of the stiffening ribs to the positions where the modular columns connect to the lower corner box and the upper corner box, respectively.

[0044] S3. Transport the modules and components to the construction site, screw the tie rods into the foundation sleeves or the connecting sleeves of the lower modules, place connecting plates between adjacent modules, and hoist the upper modules in.

[0045] S4. Place the wave-shaped gasket outside the hole of the connecting sleeve of the upper corner box, rotate the connecting sleeve to connect with the other end of the pull rod, and when the flat head bolt hole of the connecting sleeve is aligned with the flat head bolt hole of the upper corner box, screw in the flat head bolt to fix the connecting sleeve.

[0046] S5. Pass the long bolts through the lower corner box, connecting plate and upper corner box in sequence, and tighten them with the welded nuts at the bottom of the upper corner box. Place the self-resetting component in the designated position, and connect the adjacent modules with column SMA bolts and beam SMA bolts to complete the connection between the modules.

[0047] S6. After the building is completed, remove the long bolts, flat head bolts, connecting sleeves, column SMA bolts, and beam SMA bolts to complete the removal of the upper module.

[0048] The modular steel structure self-resetting tie rod-bolt connection node and construction method provided by the present invention have the following beneficial effects:

[0049] The connection nodes of this invention use tie rods and connecting sleeves to vertically connect the entire building into a whole, ensuring continuous vertical force transmission. During construction, it is not necessary to make holes inside the modular columns and modular beams, thus avoiding cross-sectional weakening. The upper and lower corner boxes are made of high-strength steel, making them suitable for high-rise modular buildings.

[0050] The connection nodes of this invention can be selected with different connection plates according to different module positions, and are suitable for connecting different corner columns, side columns and center columns.

[0051] A self-resetting assembly is installed at the corner of the node in this invention. A certain preload is applied to the deformable bolts of the self-resetting assembly. At this time, the spring has a certain deformation space. The middle plate and end plate of the self-resetting assembly fit tightly together. When the structure deforms, the grooves between the middle plate and the end plate misalign, generating friction on the contact surface, which dissipates energy. When the middle plate and the end plate misalign, the spring is further compressed when the end plate expands outward, and the preload of the deformable bolt increases accordingly. The spring generates elastic force to restore its original shape, which in turn increases the friction between the middle plate and the end plate. When the SMA wire is under tension, restoring its original length will provide a restoring force for the self-resetting assembly, which has a certain energy dissipation capacity. At the same time, it will increase the friction between the middle plate and the end plate. When the structure deforms, the beam SMA bolts and column SMA bolts will elongate, generating a higher restoring force, forming a couple to bear most of the bending moment at the beam and column ends, thus improving the energy dissipation capacity of the self-resetting assembly.

[0052] After the building is completed, the connection nodes of this invention can be removed by dismantling the upper modules through the removal of long bolts, flat-head bolts, connecting sleeves, and tie rods, thus realizing the building concept of green building. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0054] Figure 1 This is an exploded structural diagram of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0055] Figure 2 This is a schematic diagram of the overall structure of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0056] Figure 3 This is a front view of the modular steel structure self-resetting tie rod-bolt connection node for a corner column disclosed in an embodiment of this application;

[0057] Figure 4 This is a top view of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0058] Figure 5 This is a structural schematic diagram of the self-resetting assembly of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0059] Figure 6 This is an exploded view of the self-resetting assembly of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0060] Figure 7 This is an exploded view of the deformable structure of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0061] Figure 8 This is a schematic diagram of the lower corner box of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0062] Figure 9 This is a structural schematic diagram of the upper corner box of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0063] Figure 10 This is a schematic diagram of the structure of the self-resetting tie rod-bolt connection node of the modular steel structure disclosed in the embodiments of this application;

[0064] Figure 11 This is a schematic diagram of the connecting sleeve of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0065] Figure 12 This is a schematic diagram of the connecting plate of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0066] Figure 13 This is a schematic diagram of the T-shaped wrench for the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application;

[0067] Figure 14 This is an installation diagram of the tie rod of the modular steel structure self-resetting tie rod-bolt connection node disclosed in the embodiments of this application.

[0068] Explanation of reference numerals in the attached figures:

[0069] 1. Modular column; 2. Modular beam; 3. Self-resetting assembly; 4. Lower corner box; 5. Upper corner box; 6. Tie rod; 7. Connecting sleeve; 8. Connecting plate; 9. Long bolt; 10. Nut; 11. Stiffening rib; 12. Flat head bolt; 13. Wave washer; 14. Column SMA bolt; 15. Beam SMA bolt; 16. T-wrench;

[0070] 31. Self-resetting assembly fixing plate; 32. Self-resetting assembly intermediate plate; 33. Self-resetting assembly end plate; 34. Fixing bolt; 35. Deformation bolt; 36. SMA wire; 37. Spring; 38. Washer;

[0071] 311. SMA bolt holes for beams; 312. Bolt holes for fixing plates;

[0072] 321. Intermediate plate groove; 322. Intermediate plate slot;

[0073] 331. End plate groove; 332. End plate slot;

[0074] 41. Lower corner box pull rod hole; 42. Lower corner box connecting sleeve hole; 43. Lower corner box long bolt hole; 44. Lower corner box inner partition;

[0075] 51. Upper corner box pull rod hole; 52. Upper corner box connecting sleeve hole; 53. Upper corner box bottom long bolt hole; 54. Upper corner box flat head bolt hole; 55. Upper corner box inner partition;

[0076] 61. Tie rod thread; 62. Tie rod rotating head;

[0077] 71. Connecting sleeve; 72. Connecting sleeve fixing plate; 73. Connecting sleeve flat head bolt hole;

[0078] 81. Square hole; 82. Long bolt hole for connecting plate. Detailed Implementation

[0079] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0080] See Figures 1 to 14 As shown;

[0081] This embodiment discloses a modular steel structure self-resetting tie rod-bolt connection node. The connection node of this embodiment includes:

[0082] The lower corner box 4 and the upper corner box 5 are connected between the module column 1 and the module beam 2 of the upper module, and the upper corner box 5 is connected between the module column 1 and the module beam 2 of the lower module.

[0083] A self-resetting assembly 3, installed between module column 1 and module beam 2 and arranged at an angle, is connected to module column 1 and module beam 2 via column SMA bolts 14 and beam SMA bolts 15, respectively. In this embodiment, by installing the self-resetting assembly 3 between module column 1 and module beam 2, when the structure is subjected to seismic forces or other forces, module beam 2 and module column 1 undergo relative deformation. The self-resetting assembly 3 can dissipate energy through the friction of the contact surfaces and utilizes its integrated spring 37 to restore the shape by compressing the gasket 38 and end plate 33 to return to their original positions. The self-resetting assembly 3 has SMA wire 36 providing restoring force and thus a certain energy dissipation capacity. The self-resetting assembly 3, connected to module column 1 and module beam 2 via column SMA bolts 14 and beam SMA bolts 15, is made of shape memory alloy, whose hyperelastic effect provides the energy dissipation and self-resetting capabilities of this node.

[0084] The upper and lower modules are connected as one unit by tie rod 6 and connecting sleeve 7.

[0085] Preferably, in this embodiment, the top surface of the lower corner box 4 is welded and fixed to the module column 1 of the upper module, and the lower corner box 4 has a corner box pull rod hole 41 pre-drilled, and the side of the lower corner box 4 is welded and fixed to the module beam 2 of the upper module.

[0086] The lower corner box 4 has a lower corner box extension that protrudes to one side, and the lower corner box extension is provided with a lower corner box long bolt hole 43;

[0087] The lower corner box 4 is equipped with an inner partition 44 at the connection position between the lower corner box 4 and the module column 1, as well as between the long bolt holes 42 of the lower corner box.

[0088] Based on the structure of the lower corner box 4 described above, this embodiment further defines the structure of the upper corner box 5. The upper corner box 5 in this embodiment has the same structure as the lower corner box 4, but the installation positions are different.

[0089] As a difference from the lower corner box 4, the upper corner box 5 in this embodiment has a flat-head bolt hole 54 on its top surface, and a nut box is welded to one side inside the flat-head bolt hole 54, with a nut 10 inside the nut box; the upper corner box 5 has a long bolt hole 53 at the position where it matches the lower corner box long bolt hole 43, and a nut box is welded to the upper corner box long bolt hole 53 located on the bottom surface of the upper corner box 5, with a nut 10 inside the nut box.

[0090] Preferably, in this embodiment, the pull rod 6 is placed inside the module column 1, and both the upper and lower ends of the pull rod 6 have pull rod threads 61, and the upper end of the pull rod 6 has a hexagonal pull rod rotating head 62;

[0091] A T-wrench 16 is provided to cooperate with the pull rod 6. The T-wrench 16 cooperates with the pull rod rotating head 62 of the pull rod 6 to tighten the pull rod 6.

[0092] Connecting sleeve 7 includes:

[0093] Connecting cylinders 71 are respectively connected to the tie rods 6 of the upper and lower modules. Connecting cylinders 71 have internal threads to achieve threaded connection with the tie rod threads 61; and

[0094] A connecting sleeve fixing plate 72 is formed between two connecting cylinders 71, and the connecting sleeve fixing plate 72 is a square plate with connecting sleeve flat head bolt holes 73 at the four corners.

[0095] As a connecting structure between the upper and lower modules and in conjunction with the connecting sleeve 7, a connecting plate 8 is provided between the upper and lower modules in this embodiment. The connecting plate 8 has a square hole that mates with the connecting sleeve fixing plate 72, and long bolt holes 82 are reserved at both ends of the connecting plate 8.

[0096] The thickness of the connecting sleeve fixing plate 72 is less than the thickness of the connecting plate 8;

[0097] A wave-shaped gasket 13 is provided on the contact surface between the connecting sleeve fixing plate 72 and the upper corner box 5.

[0098] Based on the design of the connecting plate 8, the upper corner box 5, and the lower corner box 4, in this embodiment, the lower corner box 4, the connecting plate 8, and the upper corner box 5 are connected by a long bolt 9, wherein the length of the long bolt 9 is greater than the sum of the height of the lower corner box 4, the thickness of the connecting plate 8, and the height of the upper corner box 5.

[0099] The long bolt 9 passes through the lower corner box 4, the connecting plate 8 and the upper corner box 5 from top to bottom and is connected to the nut 10 inside the nut box welded to the upper corner box 5.

[0100] As an extended implementation method, when used for connecting side columns or center columns, a side column connecting plate or center column connecting plate is placed between two adjacent modules to connect the modules into a whole in the horizontal direction.

[0101] Preferably, in this embodiment, stiffening ribs 11 are welded and fixed between the module column 1 and the corner box surface;

[0102] The self-resetting assembly 3 includes a self-resetting assembly fixing plate 31, a self-resetting assembly intermediate plate 32 connected between the two self-resetting assembly fixing plates 31, and self-resetting assembly end plates 33 installed on both sides of the self-resetting assembly intermediate plate 32.

[0103] The self-resetting assembly intermediate plate 32 and the self-resetting assembly end plate 33 are assembled through a deformable structure.

[0104] Secondly, the deformable structure of this embodiment includes a deformable bolt 35, and the deformable bolt 35 has a spring 37 and a washer 38 near its end;

[0105] SMA wire 36 is connected between the ends of the two deformable bolts 35.

[0106] In order to realize the energy dissipation capability of the self-resetting component 3, the surface of the self-resetting component intermediate plate 32 and the self-resetting component end plate 33 mating position is formed with intermediate plate groove 321, and the self-resetting component end plate 33 and the self-resetting component intermediate plate 32 mating side are formed with end plate groove 331.

[0107] The self-resetting assembly intermediate plate 32 and the self-resetting assembly end plate 33 are respectively provided with intermediate plate slot 322 and end plate slot 332;

[0108] The deformable bolt 35 passes through the slot 322 in the intermediate plate and the slot 332 in the end plate.

[0109] Based on the structure of the self-resetting component 3, when the structure is subjected to seismic action or force, the module beam 2 and module column 1 undergo relative deformation. The groove 321 of the middle plate of the self-resetting component middle plate 32 and the groove 331 of the end plate of the self-resetting component end plate 33 are misaligned, and the friction on the contact surface plays a role in energy dissipation. When the self-resetting component middle plate 32 and the self-resetting component end plate 33 are misaligned, the spring 37 is compressed. The spring 37 restores the shape by squeezing the pad 38 and the self-resetting component end plate 33 back to their original position. The SMA wire 36 provides restoring force after deformation, which has a certain energy dissipation capacity.

[0110] This invention discloses a construction method for a modular steel structure self-resetting tie rod-bolt connection node. The construction method for the modular steel structure self-resetting tie rod-bolt connection node mainly includes the following steps:

[0111] S1. Construct module column 1, module beam 2, self-resetting component 3, upper corner box 5, lower corner box 4, tie rod 6, connecting sleeve 7, connecting plate 8, long bolt 9, nut 10, and stiffening rib 11 respectively;

[0112] S2. In the factory, the module beam is welded to both ends of the lower corner box 4 and the upper corner box 5, the module column 1 is welded to the top and bottom surfaces of the lower corner box 4 and the upper corner box 5, and the two right-angled sides of the stiffening rib 11 are welded to the positions where the module column 1 connects to the lower corner box 4 and the upper corner box 5 respectively.

[0113] S3. Transport the modules and components to the construction site, screw the tie rod 6 into the foundation sleeve or the connecting sleeve 7 of the lower module, place the connecting plate 8 between adjacent modules, and hoist the upper module in.

[0114] S4. Place the wave-shaped gasket 13 outside the hole of the connecting sleeve 7 of the upper corner box 5, rotate the connecting sleeve 7 to connect with the other end of the pull rod 6, and when the flat head bolt hole 73 of the connecting sleeve is aligned with the flat head bolt hole 54 of the upper corner box, screw in the flat head bolt 12 to fix the connecting sleeve 7.

[0115] S5. Pass the long bolt 9 through the lower corner box 4, the connecting plate 8 and the upper corner box 5 in sequence, and tighten it with the welded nut at the lower part of the upper corner box 5. Place the self-resetting component 3 in the designated position, and connect the adjacent modules through the column SMA bolt 14 and the beam SMA bolt 15 to complete the connection between the modules.

[0116] S6. After the building is completed, remove the long bolts 9, flat head bolts 12, connecting sleeves 7, column SMA bolts 14, and beam SMA bolts 15 to complete the removal of the upper module.

[0117] The modular steel structure self-resetting tie rod-bolt connection node and construction method provided by the present invention have the following beneficial effects:

[0118] The connection nodes of this invention use tie rods 6 and connecting sleeves 7 to vertically connect the entire building into a whole, ensuring continuous vertical force transmission. During construction, it is not necessary to open holes inside the modular columns 1 and modular beams 2, thus avoiding cross-sectional weakening. The upper corner box 5 and lower corner box 4 are made of high-strength steel, making them suitable for high-rise modular buildings.

[0119] The connection nodes of this invention can be selected with different connection plates according to different module positions, and are suitable for connecting different corner columns, side columns and center columns.

[0120] A self-resetting component 3 is installed at the corner of the node of the present invention. A certain preload is applied to the deformable bolt 35 of the self-resetting component 3. At this time, the spring 37 has a certain deformation space. The middle plate and the end plate of the self-resetting component 3 are tightly fitted. When the structure deforms, the grooves of the middle plate and the end plate that fit together will shift, and friction will be generated on the contact surface, which will play a role in energy dissipation. When the middle plate and the end plate shift, the spring 37 is further compressed when the end plate expands outward, and the preload of the deformable bolt 35 increases accordingly. The spring 37 generates elastic force to restore its original shape, which in turn increases the friction between the middle plate and the end plate. When the SMA wire 36 is in a tensile state, restoring its original length will provide a restoring force for the self-resetting component 3, which has a certain energy dissipation capacity. At the same time, it will increase the friction between the middle plate and the end plate. When the structure deforms, the beam SMA bolt 15 and the column SMA bolt 14 will be elongated, generating a higher restoring force, forming a couple to bear most of the bending moment at the beam and column ends, thereby improving the energy dissipation capacity of the self-resetting component 3.

[0121] After the building is completed, the upper module can be removed by removing the long bolt 9, flat head bolt 12, connecting sleeve 7, and tie rod 6, thus realizing the building concept of green building.

[0122] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A modular steel structure self-resetting tie rod-bolt connection node, characterized in that, The connection node includes: The lower corner box (4) and the upper corner box (5) are connected between the module column (1) and the module beam (2) of the upper module, and the upper corner box (5) is connected between the module column (1) and the module beam (2) of the lower module. The self-resetting assembly (3) is installed between the module column (1) and the module beam (2) and is arranged at an angle. The connection between the self-resetting assembly (3) and the module column (1) and the module beam (2) is respectively connected by column SMA bolts (14) and beam SMA bolts (15). The upper and lower modules are connected as one unit by a tie rod (6) and a connecting sleeve (7); The top surface of the lower corner box (4) is welded and fixed to the module column (1) of the upper module, and the lower corner box (4) has a pre-drilled corner box pull rod hole (41), and the side of the lower corner box (4) is welded and fixed to the module beam (2) of the upper module. The lower corner box (4) has a lower corner box extension that protrudes to one side, and the lower corner box extension is provided with a lower corner box long bolt hole (43). The lower corner box (4) is provided with an inner partition (44) at the connection position between the lower corner box (4) and the module column (1), and between the long bolt holes (43) of the lower corner box. The upper corner box (5) and the lower corner box (4) have the same structure but different installation positions; The top surface of the upper corner box (5) is provided with an upper corner box flat head bolt hole (54), and a nut box is welded to one side inside the upper corner box flat head bolt hole (54), and a nut (10) is provided inside the nut box. The upper corner box (5) is provided with an upper corner box long bolt hole (53) at a position matching the lower corner box long bolt hole (43), and a nut box is welded to the upper corner box long bolt hole (53) on the bottom surface of the upper corner box (5), and a nut (10) is provided inside the nut box. The pull rod (6) is placed inside the module column (1), and both the upper and lower ends of the pull rod (6) have pull rod threads (61), and the upper end of the pull rod (6) has a hexagonal pull rod rotating head (62). A T-shaped wrench (16) is provided in cooperation with the pull rod (6), and the T-shaped wrench (16) cooperates with the pull rod rotating head (62) of the pull rod (6) to tighten the pull rod (6). The connecting sleeve (7) includes: A connecting cylinder (71) is connected to the pull rod (6) of the upper and lower modules respectively. The connecting cylinder (71) has an internal thread to achieve a threaded connection with the pull rod thread (61); and A connecting sleeve fixing plate (72) is formed between the two connecting cylinders (71), and the connecting sleeve fixing plate (72) is a square plate with connecting sleeve flat head bolt holes (73) at the four corners of the connecting sleeve fixing plate (72). A connecting plate (8) is provided between the upper and lower modules, and the connecting plate (8) has a square hole (81) that cooperates with the connecting sleeve fixing plate (72). The connecting plate (8) has long bolt holes (82) reserved at both ends. The thickness of the connecting sleeve fixing plate (72) is less than the thickness of the connecting plate (8); The contact surface between the connecting sleeve fixing plate (72) and the upper corner box (5) is provided with a wave-shaped gasket (13). A stiffening rib (11) is welded and fixed between the module column (1) and the corner box surface. The self-resetting assembly (3) includes: Self-resetting component mounting plate (31); A self-resetting assembly intermediate plate (32) connected between the two self-resetting assembly fixing plates (31); and Self-resetting component end plates (33) are installed on both sides of the self-resetting component middle plate (32); The self-resetting assembly intermediate plate (32) and the self-resetting assembly end plate (33) are assembled by a deformable structure; The deformable structure includes a deformable bolt (35), and the deformable bolt (35) has a spring (37) and a washer (38) near its end. SMA wire (36) is connected between the ends of the two deformable bolts (35). The surface of the self-resetting assembly intermediate plate (32) and the self-resetting assembly end plate (33) at the mating position is formed with an intermediate plate groove (321), and the side of the self-resetting assembly end plate (33) that mates with the self-resetting assembly intermediate plate (32) is formed with an end plate groove (331). The self-resetting assembly intermediate plate (32) and the self-resetting assembly end plate (33) are respectively provided with intermediate plate slot (322) and end plate slot (332); The deformable bolt (35) passes through the slot (322) in the intermediate plate and the slot (332) in the end plate. The construction method for self-resetting tie rod-bolted connection nodes in modular steel structures mainly includes the following steps: S1. Construct the module column (1), module beam (2), self-resetting component (3), upper corner box (5), lower corner box (4), tie rod (6), connecting sleeve (7), connecting plate (8), long bolt (9), nut (10) and stiffening rib (11) respectively. S2. In the factory, the module beam (2) is welded to both ends of the lower corner box (4) and the upper corner box (5), the module column (1) is welded to the top and bottom surfaces of the lower corner box (4) and the upper corner box (5), and the two right-angled sides of the stiffening rib (11) are welded to the positions where the module column (1) connects to the lower corner box (4) and the upper corner box (5). S3. Transport the modules and components to the construction site, screw the tie rods into the foundation sleeve or the connecting sleeve (7) of the lower module, place the connecting plate (8) between adjacent modules, and hoist the upper module into place. S4. Place the wave-shaped gasket (13) outside the hole of the connecting sleeve (7) of the upper corner box (5), rotate the connecting sleeve (7) to connect with the other end of the pull rod (6), and when the flat head bolt hole (73) of the connecting sleeve is aligned with the flat head bolt hole (54) of the upper corner box, screw in the flat head bolt (12) to fix the connecting sleeve (7). S5. Pass the long bolt (9) through the lower corner box (4), the connecting plate (8) and the upper corner box (5) in sequence, and tighten it with the welding nut (10) at the bottom of the upper corner box (5). Place the self-resetting assembly (3) in the designated position and connect the adjacent modules through the column SMA bolt (14) and the beam SMA bolt (15) to complete the connection between the modules. S6. After the building is completed, remove the long bolts (9), flat head bolts (12), connecting sleeves (7), column SMA bolts (14), and beam SMA bolts (15) to complete the removal of the upper module.

2. The modular steel structure self-resetting tie rod-bolt connection node according to claim 1, characterized in that, The lower corner box (4), the connecting plate (8) and the upper corner box (5) are connected by a long bolt (9), and the length of the long bolt (9) is greater than the sum of the height of the lower corner box (4), the thickness of the connecting plate (8) and the height of the upper corner box (5); The long bolt (9) passes through the lower corner box (4), the connecting plate (8) and the upper corner box (5) from top to bottom and is connected to the nut (10) inside the nut box welded to the upper corner box (5).

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