Modular steel structure self-positioning clamping lock type connecting node driven by right and left threads

Abstract

The application discloses a modular steel structure self-positioning clamping and locking type connecting node driven by positive and reverse threads, which comprises an upper module unit, a lower module unit, a horizontal connecting plate and a node connector; a locking device in the node connector comprises a clamp, a positive and reverse segmented thread screw rod and positive and reverse thread special nuts; the rotating screw rod drives the shuttle-shaped special nut to mirror translate under the constraint of a limiting plate, drives the clamps on both sides to slide towards or away from each other along the sliding grooves of the bottom plate of the node connector, and realizes the locking or releasing of the head part of the connecting bolt at the top end of the lower module. The connecting bolt is provided with a conical guide top and a stepped section head part with an inclination angle to realize the self-positioning installation of the module unit. The application replaces the traditional bolt perforation connection between the upper and lower modules by the clamping and locking mechanism, retains the construction operation space, simultaneously solves the problem of complex on-site installation of the traditional connection, and has the construction blind insertion self-positioning, small tolerance self-adaptation and post-earthquake lossless dismounting and recycling capabilities.

Description

Technical Field

[0001] This invention belongs to the technical field of beam-column joints in general buildings, specifically relating to a modular steel structure self-positioning clamping connection joint driven by positive and negative threads. Background Technology

[0002] With the rapid development of the social economy and the acceleration of urbanization, modular steel structures, as a highly industrialized new type of prefabricated building, feature modular units that are prefabricated in factories and then transported to the site for assembly. They offer advantages such as high construction efficiency, environmental friendliness, and ease of reconfiguration. Unlike conventional steel structures, the mechanical properties and overall stability of modular steel structures are highly dependent on the node connection technology between modules.

[0003] While various mechanically assembled joints have been proposed in existing technologies, they still have significant limitations in practical engineering applications. For example, solutions using joint plates or end plates for fastening often involve complex components and lengthy on-site assembly processes; solutions using mortise and tenon joints with bolts require extremely high precision in component manufacturing, and the shear stiffness of the joint is often limited; solutions that create handholes at the column ends to allow space for bolt tightening severely weaken the core section and cause stress concentration, significantly reducing the seismic toughness of the joint; and solutions using long tie rods with unidirectional bolts for through connections require precise hole alignment, are extremely sensitive to prefabrication errors, and have very poor on-site tolerance. More importantly, after undergoing extreme seismic loads and deformation, the internal fasteners of the aforementioned mechanical connection solutions often become jammed, making it difficult to achieve truly non-destructive disassembly at the end of the building's life cycle or after an earthquake.

[0004] In summary, existing modular steel structure connection nodes struggle to achieve an effective balance between mechanical conductivity and ease of construction. There is an urgent need in this field for a new connection system that is rationally designed for stress distribution, has strong on-site tolerance, and enables efficient assembly and rapid, non-destructive disassembly after earthquakes. Summary of the Invention

[0005] To address the problems of difficult tightening of high-strength bolts and low assembly efficiency caused by the limited internal operating space of modular steel structures during on-site assembly, and to solve the shortcomings of traditional nodes that are prone to irreversible plastic damage in the core area after earthquakes and are difficult to achieve non-destructive disassembly and rapid functional restoration, this invention provides a self-positioning clamping connection node for modular steel structures driven by positive and negative threads. The technical solution includes: an upper module unit, a lower module unit, and a horizontal connecting plate.

[0006] The upper module unit includes: upper box-section module columns, upper I-section module beams, and node connectors. The bottom of the upper box-section module columns is aligned and fixed to the top of the node connectors. Two upper I-section module beams are vertically and fixedly connected to two adjacent sides of the node connectors, with the beam flanges remaining horizontal. The surfaces that fix the upper I-section module beams are set as the adjacent surfaces of the side openings of the node connectors.

[0007] The lower module unit includes: a lower box-section module column, a lower box-section module column top plate, and a lower I-section module beam; the top surface of the lower box-section module column top plate is flush with and fixedly connected to the top surface of the lower box-section module column, and two lower I-section module beams are respectively vertically fixed to the top of the adjacent two sides of the lower box-section module column; two connecting bolts and two shear pins are fixed to the top surface of the lower box-section module column top plate facing upward.

[0008] The node connector includes a node connector base plate and a locking device. The bottom surface of the node connector base plate is flush with and fixed to the bottom surface of the node connector. Through holes are opened on the bottom surface of the node connector base plate corresponding to the positions of the connecting bolts and anti-shear pins. Two parallel vertical baffles are provided on the two diagonal sides of the top of the node connector base plate. The horizontal orientation of the baffles is parallel to the direction of the forward and reverse segmented threaded screws on the side of the node connector, thereby forming a fixed-direction sliding groove above the base plate. The clamp in the locking device is set in the sliding groove.

[0009] The locking device includes: a pair of clamps, a forward and reverse segmented threaded screw, a forward threaded nut and a reverse threaded nut. The clamps have two stepped semi-circular through holes on their inner sides, the shape of which matches the shape of the bolt head. The upper diameter of the through hole is larger than that of the lower diameter, and the stepped surface is inclined at a small angle towards the center to achieve small tolerance adaptive compensation. The clamps have a rectangular through hole on their outer sides for placing the forward threaded nut or the reverse threaded nut, and a horizontal through hole is opened in the longitudinal center for the screw to pass through.

[0010] The forward and reverse segmented threaded screw has two adjacent forward and reverse threads, and a four-corner nut male end; the forward thread nut and the reverse thread nut respectively mesh with the corresponding thread segments on the forward and reverse segmented threaded screw; thus, by rotating the forward and reverse segmented threaded screw, a pair of clamps can be brought closer to lock or moved away to unlock.

[0011] Two connecting bolts and two shear pins are arranged diagonally. The shear pins are cylindrical, and the lower section of the shear pin is threaded and installed in the top plate of the lower box-section module column. The middle and upper sections of the shear pin are matched with the corresponding holes of the horizontal connecting plate and the corresponding holes of the node connector bottom plate to bear the horizontal shear force of the node. The connecting bolts are variable cross-section cylinders. The lower section of the connecting bolt is threaded to the top plate of the lower box-section module column. The diameter of the middle section of the connecting bolt is the same as that of the head, which is used to fill the corresponding opening of the horizontal connecting plate to cooperate in resisting shear.

[0012] The head of the connecting bolt has a nut-like structure and a conical top design. The conical top is used to guide the automatic alignment of the upper and lower module columns, realizing the self-positioning function.

[0013] The horizontal connecting plate is aligned with two connecting bolts and two shear pins installed on the top plate of the lower box-section module column through its openings. The node connector is aligned with the lower box-section module column and sits above the horizontal connecting plate.

[0014] The upper I-shaped section module beam and the node connector, as well as the lower I-shaped section module beam and the lower box-shaped section module column, are all fixedly connected. The fixed connection adopts one of the following: welding connection, bolt connection, or weld-bolt combination connection. When bolt connection is adopted, end plates, connecting plates, or angle steel connectors can be set at the ends of the module beams and connected to the node connectors or the lower box-shaped section module columns by high-strength bolts.

[0015] Both vertical baffles have horizontal baffles on their top sides facing inward. When the positive thread nut and the negative thread nut in the locking device are subjected to force, the horizontal baffles restrict the vertical displacement of the clamp and ensure the reliability of the locking state.

[0016] Gaps are provided between the horizontal baffle, the vertical baffle, and the clamp to ensure that the node still has the ability to unlock after being deformed by force.

[0017] The two outer corners of the clamp are provided with 45° angled cut surfaces to avoid interference with the inner wall of the node connector when it is in the unlocked and unfolded state.

[0018] Both positive thread and negative thread irregular nuts are spindle-shaped.

[0019] The node connector has four corner nut operating holes on its side bottom, which allow the four corner inner socket wrenches to be inserted and mate with the operating ends of the forward and reverse segmented threaded screws.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. Highly efficient construction with blind insertion and self-positioning. The top of the connecting bolt has a tapered protrusion, which enables automatic alignment and blind insertion positioning during module hoisting. The locking operation can be completed simply by using a tool to tighten the screw through the reserved hole on the bottom side of the node connector, completely solving the problem of difficult bolt tightening caused by obstructed vision and limited internal space between modules, greatly improving on-site assembly efficiency and construction safety.

[0022] 2. Reliable force transmission mechanism and excellent shear resistance. The shear pin and the connecting bolt work together, and the middle section of the connecting bolt is filled without any pores in the opening of the horizontal connecting plate, forming multiple shear defense lines to effectively resist interlayer horizontal shear force; at the same time, the clamping and locking mechanism driven by the positive and negative threads forms a tight mechanical wrap around the stepped section of the connecting bolt head, providing stable bending and pulling resistance and meeting the high stiffness connection requirements of the node.

[0023] 3. Small tolerance self-adaptation and high deformation redundancy. The stepped cross-section bottom surfaces of the clamps and connecting bolt heads are all equipped with a slight inclination angle, utilizing the wedge effect to achieve error compensation and gapless self-adaptive locking during torsional locking. Simultaneously, the internal sliding guide mechanism reserves a small deformation tolerance gap between the horizontal and vertical baffles, effectively preventing mechanical jamming of the nodes due to local yielding deformation under extreme loads, ensuring reliable operation of the internal transmission mechanism after a disaster.

[0024] 4. Non-destructive disassembly throughout the entire lifecycle. This node structure fundamentally changes the traditional node destruction mode. Unlocking simply requires reverse twisting of the side screws to separate the internal clamps and release the connecting bolts. The entire process requires no open flame work or damage to any main structural components, perfectly realizing rapid post-earthquake replacement, functional restoration, and green recycling of building modules throughout their entire lifecycle. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of an embodiment of a modular steel structure self-positioning clamping connection node driven by positive and negative threads according to the present invention.

[0026] Figure 2 This is a schematic diagram of a partially exploded structure from another perspective of an embodiment of the present invention.

[0027] Figure 3 This is a partial structural diagram of an embodiment of the present invention in the locked state.

[0028] Figure 4 This is a partial structural diagram of an embodiment of the present invention in the unlocked state.

[0029] Figure 5 This is a longitudinal sectional view of an embodiment of the present invention in the locked state.

[0030] Among them, 1-Upper box-section modular column; 2-Lower box-section modular column; 3-Upper I-section modular beam; 4-Lower I-section modular beam; 5-Node connector; 6-Horizontal connecting plate; 7-Node connector base plate; 8-Lower box-section modular column top plate; 9-Clamp; 10-Side-and-reverse segmented threaded screw; 11-Side-threaded special-shaped nut; 12-Reverse-threaded special-shaped nut; 13-Connecting bolt; 14-Shear pin. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] like Figure 1 and Figure 2 The embodiment of the present invention shown includes an upper module unit, a lower module unit, and a horizontal connecting plate 6. The upper module unit includes an upper box-section module column 1, an upper I-section module beam 3, and a node connector 5. The bottom of the upper box-section module column 1 is aligned with and fixedly connected to the top of the node connector 5. The two upper I-section module beams 3 are respectively vertically fixed to two adjacent sides of the node connector 5, and the beam flanges are kept horizontal. The surface of the upper I-section module beam 3 is set as the adjacent surface of the side opening of the node connector 5, so that the opening faces the inside of the included angle between the two upper beams (the included angle between the two upper I-section module beams 3), to ensure sufficient construction operation space in the application scenario of four-column splicing nodes.

[0033] The lower module unit includes: a lower box-section module column 2, a lower box-section module column top plate 8, and a lower I-section module beam 4; the top surface of the lower box-section module column top plate 8 is flush with and fixedly connected to the top surface of the lower box-section module column 2, and the two lower I-section module beams 4 are respectively vertically fixed to the top of the adjacent two sides of the lower box-section module column 2. The top surface of the lower box-section module column top plate 8 is fixed with two connecting bolts 13 and two shear pins 14 facing upwards; the fixing and processing of the above components are all prefabricated in the factory.

[0034] During construction, the horizontal connecting plate 6 is aligned with the two connecting bolts 13 and two shear pins 14 installed on the top plate 8 of the lower box-section module column through its openings, and the node connector 5 is aligned with the lower box-section module column 2 and located above the horizontal connecting plate 6.

[0035] The upper I-shaped section module beam 3 and the node connector 5, as well as the lower I-shaped section module beam 4 and the lower box-shaped section module column 2, are all fixedly connected. The fixed connection adopts one of the following: welding connection, bolt connection, or weld-bolt combination connection. When bolt connection is adopted, end plates, connecting plates, or angle steel connectors can be set at the ends of the module beams and connected to the node connector 5 or the lower box-shaped section module column 2 by high-strength bolts.

[0036] like Figure 2 , Figure 5As shown, the node connector 5 includes a node connector base plate 7 and a locking device. The bottom surface of the node connector base plate 7 is flush with and fixed to the bottom surface of the node connector 5. Through holes are opened on the bottom surface of the node connector base plate 7 corresponding to the positions of the connecting bolt 13 and the anti-shear pin 14. Two parallel vertical baffles are provided on the diagonal sides of the top of the node connector base plate 7. The horizontal orientation of the baffles is parallel to the direction of the positive and negative segmented threaded screws 10 on the side of the node connector 5, thereby forming a fixed-direction groove above the base plate 7. The clamp 9 in the locking device is set in the groove. Horizontal baffles are provided on the inward side of the top of the two vertical baffles. When the positive thread nut 11 and the negative thread nut 12 in the locking device are subjected to force, the horizontal baffles can effectively limit the vertical displacement of the clamp 9 and ensure the reliability of the locking state. Small gaps are provided between the horizontal baffles, the vertical baffles and the clamp 9 to ensure that the node still has the ability to unlock after deformation under force.

[0037] like Figure 3 , Figure 4 As shown, the locking device includes a pair of clamps 9, a forward and reverse segmented threaded screw 10, a forward threaded shaped nut 11, and a reverse threaded shaped nut 12. The inner side of the clamp 9 is provided with two stepped cross-section semi-circular through holes, the inner cavity shape of which matches the head shape of the connecting bolt 13. The upper diameter of the through hole is larger than that of the lower diameter, and the stepped surface is provided with a small angle inclined towards the center to achieve small tolerance adaptive compensation. The outer side of the clamp 9 is provided with a rectangular through hole for placing the forward threaded shaped nut 11 or the reverse threaded shaped nut 12. A horizontal through hole is opened in the longitudinal center for the screw 10 to pass through. The two outer corners of the clamp 9 are provided with 45° angled cut surfaces to avoid interference with the inner wall of the node connector 5 in the unlocked and unfolded state.

[0038] The forward and reverse segmented threaded screw 10 has two adjacent equal-length forward and reverse threads, with a four-corner nut male end at one end; the forward thread shaped nut 11 and the reverse thread shaped nut 12 are spindle-shaped (length greater than the thickness of the clamp 9), respectively meshing with the corresponding thread segments on the forward and reverse segmented threaded screw 10; due to the rotation constraint of the limiting stop bar, when the screw 10 is rotated around the axis, the two shaped nuts drive the clamp 9 to move in a mirror image or away from each other along the slide groove; when the screw 10 is rotated clockwise, the two clamps 9 move closer to each other to achieve locking and pre-tightening; when rotated counterclockwise, the two clamps 9 separate to achieve unlocking, and the limit position is achieved by contacting the inner wall through the 45° angled tangent; thus, by rotating the forward and reverse segmented threaded screw 10, a pair of clamps 9 can be locked by moving closer or unlocked by moving away.

[0039] like Figure 2 , Figure 5As shown, two connecting bolts 13 and two shear pins 14 are arranged diagonally. The shear pins 14 are cylindrical, and the lower section of the shear pin 14 is threadedly installed in the top plate 8 of the lower box-section module column. The upper and middle sections of the shear pin 14 are engaged with the corresponding holes of the horizontal connecting plate 6 and the bottom plate 7 of the node connector to bear the horizontal shear force of the node. The connecting bolts 13 are variable cross-section cylinders. The lower section of the connecting bolts 13 is threadedly connected to the top plate 8 of the lower box-section module column. The diameter of the middle section of the connecting bolts 13 is the same as that of the head, which is used to fill the corresponding opening of the horizontal connecting plate 6 to cooperate in shear resistance. The head of the connecting bolts 13 has a nut-like structure and a conical top design. The conical top is used to guide the automatic alignment of the upper and lower module columns to achieve self-positioning function. The bottom surface of the nut part has a small inclination angle that cooperates with the clamp 9 for automatic tolerance compensation.

[0040] The bottom side of the node connector 5 is provided with four corner nut operating holes for inserting four corner inner socket wrenches to cooperate with the operating ends of the forward and reverse segmented threaded screw 10.

[0041] The assembly process of the node of the present invention is as follows: When applying, first align the horizontal connecting plate 6 and the upper module unit in sequence and place them above the lower module unit; insert the wrench into the opening on the side of the node connector 5, rotate the screw 10 clockwise to the predetermined torque, so that the clamp 9 closes and locks the connecting bolt 13, and the installation is completed; when disassembling, rotate the screw 10 counterclockwise to make the clamp 9 retract to the limit position, release the connecting bolt 13, and then lift the upper module unit to achieve separation.

[0042] Under normal service conditions, vertical loads are transmitted through the bearing paths of the upper module column 1, node connector 5, horizontal connecting plate 6, and lower module column 2. Horizontal shear force is borne jointly by the shear pin 14 and the middle section of the connecting bolt 13. The bending and pulling resistance of the nodes is provided by the mechanical wrapping mechanism of the clamp 9 around the head of the connecting bolt 13. The redundant clearance design between the limit baffle and the horizontal stop ensures that the device can still operate normally even after a certain degree of deformation following a disaster, thus facilitating the replacement of damaged modules.

[0043] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the essence and scope of the present invention. Therefore, all equivalent technical solutions also fall within the protection scope of the present invention.

Claims

1. A modular steel structure self-positioning clamping connection node driven by positive and negative threads, characterized in that, include: Upper module unit, lower module unit and horizontal connecting plate (6); The upper module unit includes: an upper box-section module column (1), an upper I-section module beam (3), and a node connector (5). The bottom of the upper box-section module column (1) is aligned with and fixedly connected to the top of the node connector (5). The two upper I-section module beams (3) are respectively vertically fixed to the two adjacent sides of the node connector (5), and the beam flanges are kept horizontal. The surface that fixes the upper I-section module beam (3) is set as the adjacent surface of the side opening of the node connector (5). The lower module unit includes: a lower box-section module column (2), a lower box-section module column top plate (8), and a lower I-section module beam (4); the top surface of the lower box-section module column top plate (8) is flush with and fixedly connected to the top surface of the lower box-section module column (2), and the two lower I-section module beams (4) are respectively vertically fixed to the top of the adjacent two sides of the lower box-section module column (2), and the top surface of the lower box-section module column top plate (8) is fixed with two connecting bolts (13) and two shear pins (14) facing upward; The node connector (5) includes: a node connector base plate (7) and a locking device. The bottom surface of the node connector base plate (7) is flush with the bottom surface of the node connector (5). A through hole is opened on the bottom surface of the node connector base plate (7) corresponding to the position of the connecting bolt (13) and the anti-shear pin (14). Two parallel vertical baffles are provided on the diagonal sides of the top of the node connector base plate (7). The direction of the baffles in the horizontal direction is parallel to the direction of the forward and reverse segmented threaded screws (10) on the side of the node connector (5), thereby forming a fixed-direction sliding groove above the base plate (7). The clamp (9) in the locking device is set in the sliding groove. The locking device includes: a pair of clamps (9), a forward and reverse segmented threaded screw (10), a forward threaded nut (11) and a reverse threaded nut (12). The clamps (9) have two stepped semi-circular through holes on their inner side, the shape of which matches the shape of the head of the connecting bolt (13). The upper diameter of the through hole is larger than that of the lower diameter, and the stepped surface is provided with a small angle inclined towards the center to achieve small tolerance adaptive compensation. The clamps (9) have a rectangular through hole on their outer side for placing the forward threaded nut (11) or the reverse threaded nut (12), and a horizontal through hole is opened in the longitudinal center for the screw (10) to pass through. The forward and reverse segmented threaded screw (10) has two adjacent forward and reverse threads, and a four-corner nut male end; the forward thread nut (11) and the reverse thread nut (12) respectively mesh with the corresponding thread segments on the forward and reverse segmented threaded screw (10); thus, by rotating the forward and reverse segmented threaded screw (10), a pair of clamps (9) can be locked by moving closer or unlocked by moving away.

2. The modular steel structure self-positioning clamping connection node driven by positive and negative threads according to claim 1, characterized in that, Two connecting bolts (13) and two shear pins (14) are arranged diagonally. The shear pins (14) are cylindrical. The lower section of the shear pin (14) is threaded and installed in the top plate (8) of the lower box-section module column. The upper middle section of the shear pin (14) is matched with the corresponding hole of the horizontal connecting plate (6) and the corresponding hole of the node connector bottom plate (7) to bear the horizontal shear force of the node. The connecting bolt (13) is a variable cross section cylinder. The lower section of the connecting bolt (13) is threaded and connected to the top plate (8) of the lower box-section module column. The diameter of the middle section of the connecting bolt (13) is the same as that of the head, which is used to fill the corresponding opening of the horizontal connecting plate (6) to cooperate in resisting shear.

3. A modular steel structure self-positioning clamping connection node driven by positive and negative threads according to claim 1 or 2, characterized in that, The head of the connecting bolt (13) has a nut-shaped structure and a conical top design. The conical top is used to guide the automatic alignment of the upper and lower module columns and realize the self-positioning function.

4. A modular steel structure self-positioning clamping connection node driven by positive and negative threads according to claim 1, 2 or 3, characterized in that, The horizontal connecting plate (6) is aligned with the two connecting bolts (13) and two anti-shear pins (14) installed on the top plate (8) of the lower box-section module column through its opening. The node connector (5) is aligned with the lower box-section module column (2) and located above the horizontal connecting plate (6).

5. A modular steel structure self-positioning clamping connection node driven by positive and negative threads according to claim 1, characterized in that, The upper I-shaped section module beam (3) and the node connector (5), as well as the lower I-shaped section module beam (4) and the lower box-shaped section module column (2), are all fixedly connected. The fixed connection adopts one of the following: welding connection, bolt connection or weld-bolt combination connection. When bolt connection is adopted, end plates, connecting plates or angle steel connectors are set at the ends of the module beams and connected to the node connector (5) or the lower box-shaped section module column (2) by high-strength bolts.

6. A modular steel structure self-positioning clamping connection node driven by positive and negative threads according to claim 1, characterized in that, Both vertical baffles are provided with horizontal baffles on the inner side of their tops. When the positive thread nut (11) and the negative thread nut (12) in the locking device are subjected to force, the horizontal baffles restrict the vertical displacement of the clamp (9) to ensure the locking state.

7. A modular steel structure self-positioning clamping connection node driven by positive and negative threads according to claim 6, characterized in that, There are gaps between the horizontal baffle, the vertical baffle and the clamp (9) to ensure that the node still has the ability to unlock after being deformed by force.

8. A modular steel structure self-positioning clamping connection node driven by positive and negative threads according to claim 1, 6, or 7, characterized in that, The two outer corners of the clamp (9) are provided with 45° angle cut surfaces to avoid interference with the inner wall of the node connector (5) in the unlocked and unfolded state.

9. A modular steel structure self-positioning clamping connection node driven by positive and negative threads according to claim 1, 6, or 7, characterized in that, The positive thread nut (11) and the negative thread nut (12) are spindle-shaped.

10. A modular steel structure self-positioning clamping connection node driven by positive and negative threads according to claim 1, 6, or 7, characterized in that, The node connector (5) has four corner nut operating holes on its side bottom, which allow the four corner inner sleeve wrenches to be inserted and cooperate with the operating end of the forward and reverse segmented threaded screw (10). The proximity locking also includes pre-tightening.

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