Steel structural member with built-in wedge-shaped clip connection node and installation method thereof

Abstract

The application relates to the field of steel structure building joints, and provides a built-in wedge-shaped buckle connecting joint for a steel structural member and a mounting method thereof. The built-in wedge-shaped buckle connecting joint for the steel structural member comprises an upper buckle member, a lower buckle member, a vertical fastener and a horizontal bolt. The built-in wedge-shaped buckle connecting joint for the steel structural member can realize full-welding in a factory and full-bolt welding-free installation on site, the joint is not exposed, has high bearing capacity and is detachable, and is especially suitable for efficient connection of fabricated steel structural members.

Description

Technical Field

[0001] This invention relates to the field of steel structure building joints, and provides a steel structure component built-in wedge-shaped snap-fit ​​connection joint and its installation method. Background Technology

[0002] The statements herein are provided only as background information in connection with this application and do not necessarily constitute prior art.

[0003] In steel structure buildings, box-type columns are widely used due to their advantages such as good two-way bending stiffness and smooth appearance. Traditional column butt joints make it difficult to completely confine welding operations to the factory, resulting in a large amount of on-site welding work, difficulty in controlling deformation, and significant impact on welding quality from environmental and human factors. While fully bolted flange joints can avoid on-site welding, the exposed flange plates encroach on the building's clearance and require high installation precision.

[0004] While some plug-in or snap-fit ​​joints simplify on-site operations, they have limited load-bearing capacity and lack reliable vertical locking measures, making it difficult to meet the stress requirements of high-rise and large-span structures in terms of tensile and bending resistance. In particular, existing joints often require the application of bolts in multiple directions from the outside or rely on the elastic deformation of the component itself for locking, failing to provide active vertical preload and resulting in insufficient overall joint stiffness. Summary of the Invention

[0005] This invention provides a steel structure component with a built-in wedge-shaped buckle connection node. During on-site installation, the upper and lower columns can be connected and locked together by simply relying on the buckle engagement, the built-in vertical fasteners and the horizontal bolts, completely eliminating on-site welding, and at the same time greatly improving the load-bearing rigidity and installation convenience of the node.

[0006] This invention also provides an installation method for steel structural components using built-in wedge-shaped snap-fit ​​connection nodes.

[0007] A first aspect of the present invention provides a steel structural member connection node with an internal wedge-shaped fastener, comprising an upper fastener, a lower fastener, a vertical fastener, and a horizontal bolt. The upper fastener is fixed to the lower end of an upper steel structural member, and the interior of the upper fastener is a semi-enclosed cavity with only one side open downwards. The inner wall of the upper fastener has an upper wedge-shaped force-bearing surface. The lower fastener is fixed to the upper end of a lower steel structural member, and the interior of the lower fastener is a semi-enclosed cavity with only one side open upwards. The inner wall of the lower fastener has a lower wedge-shaped force-bearing surface. The opening surface of the upper fastener and the lower fastener... The opening surfaces of the two fasteners are fitted together to form a receiving cavity; the vertical fastener is placed in the receiving cavity, the upper end of the vertical fastener is provided with an upper wedge-shaped force-applying surface that cooperates with the upper wedge-shaped force-bearing surface, and the lower end of the vertical fastener is provided with a lower wedge-shaped force-applying surface that cooperates with the lower wedge-shaped force-bearing surface; the horizontal bolt passes through the side wall of the upper and / or lower fasteners in the horizontal direction and is connected to the vertical fastener; the horizontal bolt is used to drive the vertical fastener to move horizontally, so as to generate a vertical component force through the squeezing action of the wedge-shaped surface, and lock the upper and lower fasteners vertically.

[0008] According to one embodiment of the present invention, a semi-threaded hole is provided on the side wall opening end face of the upper fastener and the side wall opening end face of the lower fastener. When the upper fastener and the lower fastener are engaged, the semi-threaded hole engages to form a complete threaded hole through which the transverse bolt passes.

[0009] According to one embodiment of the present invention, both the upper wedge-shaped force-bearing surface and the lower wedge-shaped force-bearing surface are inwardly inclined slopes; Both the upper and lower wedge-shaped force-applying surfaces are inclined surfaces whose shapes are complementary to the corresponding wedge-shaped force-receiving surfaces; When the horizontal bolt is tightened, the vertical fastener generates a vertical motion component while moving horizontally to press the upper and lower buckles together.

[0010] According to one embodiment of the present invention, the vertical fastener has a threaded hole on the side facing the sidewall of the buckle, and the screw of the transverse bolt is screwed into the threaded hole to achieve a transverse pulling engagement.

[0011] According to one embodiment of the present invention, the outer periphery of the upper fastener is flush with the outer periphery of the upper steel structure, and the outer periphery of the lower fastener is flush with the outer periphery of the lower steel structure, so that the connection node is completely hidden within the cross-sectional projection of the steel structure.

[0012] According to one embodiment of the present invention, the upper fastener has a closed top surface, which is fully welded to the lower end surface of the upper steel structure; the lower fastener has a closed bottom surface, which is fully welded to the upper end surface of the lower steel structure.

[0013] According to one embodiment of the present invention, both the upper and lower fasteners are rectangular cross-section blocks, and the opening surfaces of both the upper and lower fasteners are rectangular annular surfaces.

[0014] According to one embodiment of the present invention, the vertical fastener is an independent block-shaped or frame-shaped component, and the vertical fastener includes corner vertical fasteners disposed at the corner of the receiving cavity and / or central vertical fasteners disposed in the middle of the receiving cavity.

[0015] According to one embodiment of the present invention, a plurality of upper wedge-shaped force-applying surfaces and lower wedge-shaped force-applying surfaces are correspondingly provided around the vertical fastener.

[0016] According to one embodiment of the present invention, multiple sets of the transverse bolts are provided along the circumference of the fastener, and each set of the transverse bolts is connected to one of the vertical fasteners. Alternatively, one of the vertical fasteners may be connected to multiple sets of the horizontal bolts.

[0017] According to one embodiment of the present invention, the upper buckle member has upper wedge-shaped force-bearing surfaces machined around its four inner walls, and the lower buckle member has lower wedge-shaped force-bearing surfaces machined around its four inner walls, with the upper and lower wedge-shaped force-bearing surfaces having opposite inclination directions.

[0018] According to one embodiment of the present invention, the transverse bolt includes a threaded rod and a nut located outside the side wall of the snap fastener, and tightening the nut externally applies an active vertical preload to the vertical fastener.

[0019] According to one embodiment of the present invention, the vertical fastener and the upper and lower wedge-shaped force-bearing surfaces are completely covered inside the receiving cavity and are not exposed.

[0020] A second aspect of the present invention provides an installation method for a steel structural member using a built-in wedge-shaped snap-fit ​​connection node as described above, comprising: In the factory, the closed top surface of the upper fastener is fixedly welded to the lower end of the upper steel structure, the closed bottom surface of the lower fastener is fixedly welded to the upper end of the lower steel structure, and the vertical fasteners are pre-placed into the cavity of the upper or lower fastener. After being transported to the site, the upper steel structure is hoisted so that the opening surface of the upper fastener is aligned with the opening surface of the lower fastener and fits together to form the receiving cavity. The horizontal bolt is passed through the bolt hole on the side wall of the buckle and threaded to the internal vertical fastener. The horizontal bolt is tightened, and the vertical fastener is driven to cooperate through the wedge surfaces of the upper wedge force application surface and the upper wedge force receiving surface, and the lower wedge force application surface and the lower wedge force receiving surface, thereby rigidly locking the upper buckle and the lower buckle along the vertical direction, completing the welding-free assembly on site.

[0021] According to the first aspect of the present invention, the steel structural member with built-in wedge-shaped buckle connection node allows all welding processes to be completed in the factory prefabrication stage. On-site construction only requires bolt tightening and assembly, eliminating high-altitude on-site welding and avoiding defects such as on-site welding deformation and weld quality interference from the environment and human skill. This significantly improves the consistency of node connection quality and reduces safety hazards associated with on-site construction. The horizontal feed of the transverse bolts, combined with complementary wedge-shaped inclined surfaces, generates a vertical pre-tightening force. There is no need for long vertical bolts penetrating the upper and lower columns, nor for through holes in the column body. This preserves the original cross-sectional integrity of the steel structural member and does not weaken the vertical and bi-directional bending load-bearing capacity of the column. The overall tensile, bending, and shear stiffness of the node is significantly improved, meeting the design requirements for strong nodes in high-rise, large-span steel structures. The outer contours of the upper and lower buckles are completely flush with the columns, and all locking and force-transmitting components are internally concealed with no external protruding structures, thus not occupying effective internal clearance of the building. The semi-enclosed snap-fit ​​mechanism forms a sealed cavity, and the wedge-face friction locking structure can isolate external moisture and dust, preventing rust and jamming problems. The joint has better fatigue resistance and seismic durability.

[0022] According to the second aspect of the present invention, the installation method for steel structural components using built-in wedge-shaped snap-fit ​​connection nodes allows all welding processes to be transferred to a standardized factory workshop. The welding environment and flaw detection conditions are controllable, ensuring stable weld bearing capacity and forming quality. This eliminates weld defects and component welding deformation caused by high-altitude welding at the source, significantly improving the overall quality of the steel structure project. Vertical fasteners are pre-installed into the snap-fit ​​cavities at the factory, eliminating the need for manual placement of components in confined spaces on the construction site. This simplifies high-altitude operations, reduces safety risks, and increases on-site assembly speed. The entire construction process involves only two basic steps: hoisting and alignment, and bolt tightening. On-site welding is eliminated, and welding machines, gas cylinders, and fire protection equipment are not required. This significantly reduces the difficulty of on-site safety management and shortens the assembly period for a single column, improving the overall construction efficiency of prefabricated buildings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the steel structural component provided by the present invention after assembly.

[0025] Figure 2 This is a schematic exploded view of the upper fastener, lower fastener, vertical fastener, and horizontal bolt provided by the present invention.

[0026] Figure 3 This is a schematic perspective view of the upper fastener with its closed surface facing upwards and the lower fastener with its closed bottom surface facing upwards, provided by the present invention.

[0027] Figure 4 This is a schematic perspective view of the upper fastener with its opening facing upwards and the lower fastener with its opening facing upwards, provided by the present invention.

[0028] Figure 5 yes Figure 3 A schematic cross-sectional view along the AA direction.

[0029] Figure 6 This is a schematic perspective view of the transverse bolt provided by the present invention.

[0030] Figure 7 This is a schematic perspective view of the vertical fastener provided by the present invention.

[0031] Figure 8 This is a side view of the corner vertical fastener provided by the present invention.

[0032] Figure 9 This is a side view of the central vertical fastener provided by the present invention.

[0033] Figure 10 This is a schematic exploded view of the installation of steel structural components provided by the present invention.

[0034] Figure 11 This is a schematic flowchart of the installation method for steel structural components provided by the present invention.

[0035] Figure label: 100. Upper steel structural component; 102. Lower steel structural component; 104. Upper fastener; 106. Lower fastener; 108. Vertical fastener; 110. Horizontal bolt; 112. Upper wedge-shaped bearing surface; 114. Lower wedge-shaped bearing surface; 116. Upper wedge-shaped force-applying surface; 118. Lower wedge-shaped force-applying surface; 120. Semi-threaded hole; 122. Closed top surface; 124. Closed bottom surface; 126. Screw; 128. Nut. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] The specific terms used in this specification are for illustrative purposes only and are not intended to limit the illustrated embodiments. For example, expressions such as "same" and "identical" not only indicate a strictly identical state, but also indicate a state with tolerances or differences in the degree of functionality. For example, expressions indicating relative or absolute arrangement such as "in a certain direction," "along a certain direction," "side by side," "perpendicular," "centered on," "concentric," or "coaxial" not only strictly indicate such an arrangement, but also indicate a state of relative displacement by tolerances or angles or distances with the same degree of functionality.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, features specified as "first" or "second" may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "multiple" means two or more. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified. In the description of the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, B1 and / or B2 can represent: B1 existing alone, B1 and B2 existing simultaneously, and B2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] like Figures 1 to 10 As shown, a first aspect of the present invention provides a steel structural member connection node with an internal wedge-shaped buckle, including an upper buckle 104, a lower buckle 106, a vertical fastener 108, and a horizontal bolt 110. The upper buckle 104 is fixed to the lower end of the upper steel structural member 100, and the interior of the upper buckle 104 is a semi-enclosed cavity with only one side open downwards. The inner wall of the upper buckle 104 is provided with an upper wedge-shaped force-bearing surface 112. The lower buckle 106 is fixed to the upper end of the lower steel structural member 102, and the interior of the lower buckle 106 is a semi-enclosed cavity with only one side open upwards. The inner wall of the lower buckle 106 is provided with a lower wedge-shaped force-bearing surface 114. The opening surface of the upper buckle 104 is aligned with the lower wedge-shaped force-bearing surface 114. The opening surfaces of the lower fastener 106 are fitted together to form a receiving cavity; the vertical fastener 108 is placed in the receiving cavity, the upper end of the vertical fastener 108 is provided with an upper wedge-shaped force-applying surface 116 that cooperates with the upper wedge-shaped force-bearing surface 112, and the lower end of the vertical fastener 108 is provided with a lower wedge-shaped force-applying surface 118 that cooperates with the lower wedge-shaped force-bearing surface 114; the horizontal bolt 110 passes through the side wall of the upper fastener 104 and / or the lower fastener 106 in the horizontal direction and is connected to the vertical fastener 108; the horizontal bolt 110 is used to drive the vertical fastener 108 to move horizontally, so as to generate a vertical component force through the squeezing action of the wedge-shaped surface, and lock the upper fastener 104 and the lower fastener 106 vertically.

[0042] According to the first aspect of the present invention, the steel structural member with built-in wedge-shaped buckle connection node allows all welding processes to be completed in the factory prefabrication stage. On-site construction only requires bolt tightening and assembly, eliminating high-altitude on-site welding and avoiding defects such as on-site welding deformation and weld quality interference from the environment and human skill. This significantly improves the consistency of node connection quality and reduces safety hazards associated with on-site construction. The vertical pre-tightening force is generated by the 110mm horizontal feed of the transverse bolts in conjunction with the complementary wedge-shaped inclined surface. There is no need for long vertical bolts penetrating the upper and lower columns, nor for through holes in the column body. This preserves the original cross-sectional integrity of the steel structural member and does not weaken the vertical and bi-directional bending load-bearing capacity of the column. The overall tensile, bending, and shear stiffness of the node is significantly improved, meeting the design requirements for strong nodes in high-rise, large-span steel structures. The outer contours of the upper and lower buckles are completely flush with the columns, and all locking and force-transmitting components are internally concealed with no external protruding structures, thus not occupying effective internal clearance of the building. The semi-enclosed snap-fit ​​mechanism forms a sealed cavity, and the wedge-face friction locking structure can isolate external moisture and dust, preventing rust and jamming problems. The joint has better fatigue resistance and seismic durability.

[0043] Please continue reading Figures 1 to 10 The upper steel structure component 100 and the lower steel structure component 102 can be rectangular closed steel box profiles, serving as the main vertical load-bearing components of the building.

[0044] The connection node includes four types of independent steel components: upper fastener 104, lower fastener 106, vertical fastener 108, and horizontal bolt 110. The upper fastener 104 is a metal block with a semi-closed cavity structure formed by internal milling. Only the bottom has an opening, while the other five sides are completely closed. The closed top surface 122 of the upper fastener 104 is fixedly connected to the lower end face of the upper steel structure component 100 by a full circumferential welding process. The inner wall of the cavity is integrally machined with an inwardly inclined upper wedge-shaped force-bearing surface 112.

[0045] It should be noted that, in the embodiments of the present invention, the steel structural components can be in various forms such as steel columns, steel beams, and steel-concrete composite columns.

[0046] The lower fastener 106 and the upper fastener 104 have completely matched cross-sectional contours. The interior is also milled with a semi-closed cavity, with only the top open and the other five sides closed. The bottom surface 124 of the lower fastener is fully welded to the upper end surface of the lower steel structure 102. The inner wall of the cavity is machined with a lower wedge-shaped force-bearing surface 114 that is opposite to the direction of the upper wedge-shaped force-bearing inclination.

[0047] The upper steel structure component 100 was hoisted on site, so that the upper buckle opening surface and the lower buckle opening processing plane were completely fitted together, and the two semi-closed cavities were aligned to form a complete sealed receiving cavity.

[0048] The vertical fastener 108 is placed independently inside the receiving cavity. The upper end of the component is formed with an upper wedge-shaped force-applying surface 116 that is completely complementary to the upper wedge-shaped force-bearing surface 112, and the lower end is formed with a lower wedge-shaped force-applying surface 118 that matches the lower wedge-shaped force-bearing surface 114. The side of the vertical fastener 108 has a complete internal thread hole.

[0049] The upper and lower clips are fitted with corresponding semi-threaded holes 120 on the side wall. After they are joined together, they form a complete through threaded channel. The horizontal bolt 110 passes horizontally through the complete threaded hole formed by the splicing from the outside. The screw 126 is screwed into the internal thread on the side of the vertical fastener 108 to achieve a rigid connection.

[0050] The operator tightens the horizontal bolt 110 from the outside of the buckle. The horizontal tension causes the vertical fastener 108 to slide horizontally inside the cavity. The upper and lower complementary wedge-shaped inclined surfaces press against each other and contact each other. The horizontal sliding motion decomposes into bidirectional vertical force, which presses the upper buckle upward and the lower buckle downward, thus completing the rigid clamping and locking of the upper and lower buckles in the vertical direction.

[0051] The entire set of buckles and fasteners are housed within the projection range of the upper and lower column sections, with no external protruding components. All wedge surfaces and locking structures are enclosed inside the receiving cavity, with only the horizontal bolts 110 and nuts 128 exposed on the outside.

[0052] According to one embodiment of the present invention, a semi-threaded hole 120 is provided on the side wall opening end face of the upper fastener 104 and the side wall opening end face of the lower fastener 106. When the upper fastener 104 and the lower fastener 106 are engaged, the semi-threaded hole 120 engages to form a complete threaded hole through which the transverse bolt 110 passes.

[0053] In one embodiment of the present invention, a semi-circular arc threaded groove is formed on the side wall of the upper buckle opening end face in the horizontal direction, and a symmetrical semi-circular arc threaded groove is formed on the corresponding side wall of the lower buckle. The thread profile and pitch of the two semi-circular threaded grooves are completely uniform.

[0054] When the upper snap-fit ​​precision-machined opening plane and the lower snap-fit ​​opening plane are fully fitted and pressed together, the two sets of semi-circular arc threaded grooves are precisely aligned and combined to form a complete through cylindrical threaded hole. The axis of the threaded hole is kept horizontally arranged and coaxially aligned with the threaded hole on the side of the vertical fastener 108.

[0055] The inner diameter of the complete threaded hole matches the outer diameter of the transverse bolt 110 screw 126. The screw 126 can pass through the spliced ​​threaded hole without obstruction and then be screwed into the internal thread of the vertical fastener 108. The spliced ​​threaded hole can share the radial shear force generated by the transverse preload of the bolt.

[0056] The upper and lower snap-fit ​​surfaces have no rubber or metal sealing gaskets; the metal hard-fit seal is achieved by relying on the machined surface, and the splicing threaded holes are completely sealed on the outer wall of the receiving cavity.

[0057] The split semi-threaded splicing structure is manufactured separately in the factory along with the upper and lower clips, eliminating the need for separate drilling and thread processing on-site. Factory prefabrication is more efficient and avoids damage to the column and clip base material caused by on-site drilling.

[0058] After the two half threads are fitted together, a complete thread bearing surface is formed. The bolt preload shear force is shared by the upper and lower clips. A single clip will not bear the entire thread load alone. The local stress on the side wall of the clip is greatly reduced, avoiding thread stripping and side wall cracking failure under long-term load.

[0059] The threaded splicing structure and the snap-fit ​​plane are integrated into one design. The bolt insertion channel and the snap-fit ​​are completed simultaneously. After on-site hoisting and alignment, there is no need to separately calibrate the threaded hole position. The bolt insertion conditions can be completed in one fitting, which reduces the difficulty of on-site assembly and alignment and shortens the construction operation time.

[0060] According to one embodiment of the present invention, both the upper wedge-shaped force-bearing surface 112 and the lower wedge-shaped force-bearing surface 114 are inwardly inclined slopes; Both the upper wedge-shaped force-applying surface 116 and the lower wedge-shaped force-applying surface 118 are inclined surfaces whose shapes are complementary to the corresponding wedge-shaped force-receiving surfaces; When the horizontal bolt 110 is tightened, the vertical fastener 108 generates a vertical motion component while moving horizontally, so as to press the upper and lower buckles 106 in opposite directions.

[0061] In one embodiment of the present invention, the upper wedge-shaped force-bearing surface 112 of the inner wall of the upper buckle cavity is inclined toward the center of the cavity, and the lower wedge-shaped force-bearing surface 114 of the inner wall of the lower buckle is also inclined toward the center of the cavity. The inclination angles of the upper and lower inclined surfaces are matched and symmetrical.

[0062] The upper wedge-shaped force-applying surface 116 of the vertical fastener 108 has an inclination angle that is completely matched with the upper wedge-shaped force-bearing surface 112, and the lower wedge-shaped force-applying surface 118 has an inclination angle that is precisely matched with the lower wedge-shaped force-bearing surface 114. The two sets of inclined surfaces can be completely and tightly fitted in contact over a large area.

[0063] The operator tightens the horizontal bolt 110, and the screw 126 pulls the vertical fastener 108 to move horizontally along the axis toward the snap-fit ​​side wall. During the horizontal translation, the complementary inclined planes continuously squeeze and slide against each other, and the horizontal force is decomposed along the inclined plane to generate two components of force, one vertically upward and one vertically downward.

[0064] The upward force continuously presses the upper buckle together, and the downward force continuously presses the lower buckle together, achieving a rigid locking of the upper and lower buckles in both directions along the vertical direction; the inclined contact area fully covers the upper and lower end faces of the fastener, resulting in uniform force distribution and no local stress concentration.

[0065] The symmetrical and complementary bidirectional wedge structure can generate bidirectional clamping forces simultaneously. Only one set of horizontal drive bolts is needed to simultaneously tighten the upper and lower columns. Unlike structures that only wedge in one direction and can only clamp one side of the components, this node has a larger vertical preload, completely eliminates the gaps between the columns, and greatly improves the anti-slip and anti-pull bearing capacity.

[0066] The large-area inclined surface is used to disperse the compressive load, and the pressure in the wedge contact area is lower. Under long-term repeated earthquakes and loads, it is not easy for local plastic deformation to occur. The fatigue resistance and seismic performance of the joint are better than those of the narrow wedge block structure.

[0067] Vertical locking can be achieved by tightening the bolts from a single angle on the side, eliminating the need for additional tightening points at the top and bottom of the column, making it suitable for construction operations in narrow floors.

[0068] According to one embodiment of the present invention, the vertical fastener 108 has a threaded hole on the side facing the side wall of the buckle, and the screw 126 of the horizontal bolt 110 is screwed into the threaded hole to achieve a lateral pulling engagement.

[0069] In one embodiment of the present invention, an internal threaded through hole is opened at the center of the flat wall surface on the side of the fastener near the snap-fit ​​threaded hole, and the axis of the threaded hole is arranged coaxially with the complete threaded hole of the splice.

[0070] After the horizontal bolt 110 and screw 126 pass through the threaded holes of the upper and lower snap fasteners, the end is fully screwed into the internal thread of the vertical fastener 108. The bolt nut 128 abuts against the outer wall of the snap fastener. When the nut 128 is tightened, the nut 128 forms a limiting support on the outer wall of the snap fastener. The screw 126 continuously pulls the vertical fastener 108 to move horizontally towards the side wall.

[0071] The depth of the internal thread hole matches the effective engagement length of the screw 126, ensuring that the bolt can provide sufficient horizontal tension. The thread is fully engaged without the risk of stripping. The thread hole is located in the middle area of ​​the fastener, so as not to damage the complete fit structure of the upper and lower wedge-shaped force application surfaces 118.

[0072] The thread is opened in the middle of the vertical fastener 108 body, and the upper and lower wedge surfaces maintain a complete and continuous force-bearing surface. The opening will not weaken the wedge surface compression bearing area, ensuring a stable output of the vertical clamping force.

[0073] Nut 128 abuts against the outer wall of the buckle to form a force support point, and the tension transmission path is clear. Nut 128 supports the buckle, and screw 126 pulls the fastener. The wedge surface squeezes and locks the upper and lower columns. There are no weak components in the middle of the force transmission. The overall force transmission path of the node is simple and efficient, and the structure has higher rigidity.

[0074] According to one embodiment of the present invention, the outer periphery of the upper fastener 104 is flush with the outer periphery of the upper steel structure 100, and the outer periphery of the lower fastener 106 is flush with the outer periphery of the lower steel structure 102, so that the connection node is completely hidden within the cross-sectional projection of the steel structure.

[0075] In one embodiment of the present invention, the outer contour length and width of the upper buckle 104 are exactly equal to the cross-sectional length and width of the upper steel structure 100, the outer contour of the lower buckle is completely consistent with the cross-sectional dimensions of the lower steel structure, the outer wall of the buckle and the outer wall of the column are on the same vertical plane, and there are no protruding steps, flange plates, or external buckle structures.

[0076] After the upper and lower buckles are aligned, the overall shape completely overlaps with the column cross-section. All wedge surfaces, vertical fasteners 108, and bolt thread splicing structures are all contained inside the column cross-section projection, with only the horizontal bolts 110 and nuts 128 slightly exposed on the side of the column.

[0077] The outer contours of the upper fastener 104 and the lower fastener 106 have no outwardly protruding connecting components, so they will not encroach on the usable space inside the building or the ceiling. Subsequent wall paneling, floor slab laying, and decoration construction do not need to avoid the node components, simplifying the building construction process and improving space utilization.

[0078] According to one embodiment of the present invention, the upper fastener 104 has a closed top surface 122, which is fully welded to the lower end surface of the upper steel structure 100; the lower fastener 106 has a closed bottom surface 124, which is fully welded to the upper end surface of the lower steel structure 102.

[0079] In one embodiment of the present invention, the top of the upper buckle is completely closed to form a solid closed top surface 122. The planar dimensions of the top surface are completely matched with the lower section of the upper steel structure 100. The four edges of the top surface are connected to the lower perimeter of the column by continuous full welds.

[0080] The bottom of the lower buckle is completely closed to form a solid closed bottom surface 124. The bottom surface contour matches the upper section of the lower column. The bottom surface is continuously and fully welded to the upper part of the column. The processing and quality inspection are also completed in the factory's standardized welding station.

[0081] The closed top surface 122 and the closed bottom surface 124 serve as the overall load-bearing benchmark for the buckle, transferring the vertical load of the column completely to the wedge-shaped structure inside the buckle cavity. The closed plate can prevent external moisture from seeping into the cavity from the end of the column.

[0082] The factory's standardized full welding process ensures stable and controllable welding quality, completely avoiding the defects of unstable quality and large deformation in on-site high-altitude welding. The tensile and shear bearing capacity of the weld between the column and the buckle meets the stress standards for high-rise structures.

[0083] The sealed top and bottom surfaces form a complete waterproof barrier, preventing rainwater and construction moisture from entering the cavity from the column ends. The internal wedge surfaces and fasteners remain dry for a long time, eliminating rust, jamming, and failure problems, and significantly improving the durability of the joints.

[0084] According to one embodiment of the present invention, both the upper fastener 104 and the lower fastener 106 are rectangular cross-section blocks, and the opening surfaces of both the upper fastener 104 and the lower fastener 106 are rectangular annular surfaces.

[0085] In one embodiment of the present invention, the upper and lower buckles can be formed by milling a rectangular solid steel block, with the outer contour being a standard rectangle; after milling away the middle material to form a cavity, the bottom and top are respectively formed into rectangular annular openings, with the four sides of the openings being flat and without gaps, and the length and width of the rectangular annular surface matching the inner contour of the column section.

[0086] The rectangular ring is completely fitted on all four sides, and the upper and lower buckles make synchronous contact on all four sides when they are connected. The fit is even and there is no gap on one side that causes local stress concentration, resulting in better sealing.

[0087] According to one embodiment of the present invention, the vertical fastener 108 is an independent block-shaped or frame-shaped component, and the vertical fastener 108 includes corner vertical fasteners 108 disposed at the corner of the receiving cavity and / or central vertical fasteners 108 disposed in the middle of the receiving cavity.

[0088] In one embodiment of the present invention, the vertical fastener 108 is divided into two types of independent steel components: corner fasteners and middle fasteners. The two types of components can be used individually or arranged in combination.

[0089] The corner vertical fastener 108 is shaped to match the four corner spaces of the receiving cavity, and upper and lower wedge-shaped force-applying surfaces 118 are respectively set at the four corners to match the wedge-shaped force-bearing surfaces of the inner walls of the four corners of the buckle; the middle vertical fastener 108 is arranged at the center of the cavity, and upper and lower wedge-shaped surfaces are formed on the four sides respectively, corresponding to the wedge-shaped force-bearing areas in the middle of the four walls of the buckle.

[0090] Fasteners can be either solid block-shaped integrally milled or machined into a hollow frame-shaped weight-reducing structure. Both types of fasteners are individually equipped with side threaded holes and each is matched with one or more sets of transverse bolts 110. The number of bolts can be increased or decreased according to the column cross-section size and load.

[0091] The corner and center fasteners can achieve zoned force transmission. Multiple sets of fasteners can be arranged simultaneously on large-section, high-load columns to distribute the vertical pre-tightening force at multiple points. The force is evenly distributed around the buckle, and there will be no problem of insufficient clamping on one side or uneven gaps. It is suitable for the connection conditions of large-span heavy steel structure components.

[0092] With two molding options—block and frame—the frame-shaped columns for low-load applications can reduce overall weight and assembly / hoisting weight, while solid blocks can be used for high-load applications to enhance wedge compressive strength, making the components suitable for a wider range of scenarios.

[0093] According to one embodiment of the present invention, a plurality of upper wedge-shaped force-applying surfaces 116 and lower wedge-shaped force-applying surfaces 118 are correspondingly provided around the vertical fastener 108.

[0094] In one embodiment of the present invention, the upper and lower ends of the four sides of the corner and middle vertical fasteners 108 are respectively machined with an upper wedge-shaped force-applying surface 116 and a lower wedge-shaped force-applying surface 118, and the four wedge surfaces correspond one-to-one with the upper and lower wedge-shaped force-receiving surfaces 114 of the four walls of the snap-fit ​​cavity and complement each other.

[0095] Each wedge face independently forms a compression force transmission area, and the surrounding wedge faces synchronously participate in the generation of vertical clamping force. The tilt angle of all wedge faces is uniformly matched with the inner wall slope of the buckle. After the bolt is tightened, the fastener generates bidirectional vertical force synchronously around its perimeter.

[0096] The fasteners are all equipped with wedge surfaces, and vertical clamping force is applied to the upper and lower clips simultaneously from all directions. The gaps around the clips are eliminated simultaneously, and the joints are evenly fitted around the edges. Under lateral wind loads and seismic action, the column will not have gaps on one side, and the overall lateral stiffness is greatly improved.

[0097] The multi-faceted synchronous distribution of the compressive load significantly reduces the load borne by a single wedge surface, resulting in a significant decrease in the probability of plastic deformation and wear of the wedge surface. The locking performance of the node remains stable under long-term repeated loading, demonstrating outstanding seismic durability.

[0098] According to one embodiment of the present invention, multiple sets of transverse bolts 110 are arranged along the circumference of the fastener, and each set of transverse bolts 110 is connected to a vertical fastener 108. Alternatively, a vertical fastener 108 can be connected to multiple sets of horizontal bolts 110.

[0099] In one embodiment of the present invention, the horizontal bolt 110 and the vertical fastener 108 can be arranged in at least two ways.

[0100] First arrangement: Multiple sets of horizontal bolts 110 are evenly arranged around the perimeter of the snap-fit ​​rectangle. Each set of bolts corresponds to a single corner or center vertical fastener 108. Each set of bolts can independently pull the corresponding fastener to slide horizontally, and the locking actions of each set do not interfere with each other.

[0101] The second arrangement: Multiple sets of parallel internal threads are opened on the side of a single central vertical fastener 108, and multiple horizontal bolts 110 are simultaneously screwed into the same fastener at different heights and horizontal positions. Multiple bolts provide horizontal tension simultaneously, increasing the extrusion force of a single set of wedge surfaces.

[0102] Multiple sets of bolts are symmetrically and evenly arranged along the circumference of the buckle, resulting in symmetrical force distribution. The number of bolts can be increased or decreased according to the load level of the column, and the bolt specifications are uniform and standardized.

[0103] The multi-bolt zone fastener solution enables synchronous and uniform locking around the buckle, preventing excessive preload on one side from causing buckle twisting and deformation, and resulting in higher flatness of the column joint surface. A single fastener paired with multiple bolts can significantly increase the total horizontal tensile force, and the wedge-face compressive force increases simultaneously, making it suitable for high-rise, high-load columns, and multiplying the vertical locking load-bearing capacity of the joint.

[0104] According to one embodiment of the present invention, the four inner walls of the upper fastener 104 are all machined with upper wedge-shaped force-bearing surfaces 112, and the four inner walls of the lower fastener 106 are all machined with lower wedge-shaped force-bearing surfaces 114, and the upper and lower wedge-shaped force-bearing surfaces 114 are inclined in opposite directions.

[0105] In one embodiment of the present invention, the four vertical inner walls of the upper buckle rectangular cavity are all inclined inward to form an upper wedge-shaped force-bearing surface 112, and the inclination angle of the four inclined surfaces is uniform; the four vertical inner walls of the lower buckle are all formed with a lower wedge-shaped force-bearing surface 114, and the inclination direction of the lower inclined surface is opposite and symmetrical to that of the upper inclined surface.

[0106] After the upper and lower buckles are engaged, the upper and lower inclined surfaces at the same vertical position form a pair of complementary wedge surfaces, which are respectively attached to the upper and lower force application surfaces of the vertical fastener 108. All four inner walls participate in the extrusion force transmission, and there is no blank force-bearing area.

[0107] The buckle has wedge-shaped force-bearing surfaces on all four sides, which can fit in all directions with the wedge surfaces around the fastener. Vertical clamping force is generated simultaneously from all four sides, and the buckle is subjected to balanced force. There will be no problems such as poor fit in some areas or uneven gaps. The overall airtightness and rigidity uniformity of the joint are greatly improved.

[0108] The symmetrical inclined planes on the top and bottom form a bidirectional extrusion structure. The horizontal displacement generates upward and downward forces simultaneously. The upper and lower columns can be locked simultaneously by relying on the horizontal tension on one side. The force transmission logic is simple and efficient, reducing the number of fastening parts.

[0109] According to one embodiment of the present invention, the transverse bolt 110 includes a screw 126 and a nut 128 located outside the side wall of the snap fastener, and tightening the nut 128 externally applies an active vertical preload to the vertical fastener 108.

[0110] In one embodiment of the present invention, the transverse bolt 110 is integrally composed of a cylindrical screw 126 and a polygonal fastening nut 128. During the tightening operation, the nut 128 completely abuts against the flat wall surface outside the buckle to form a support limit.

[0111] The operator uses a torque tool to rotate the nut 128 from the outside of the column side. The screw 126 continuously pulls the vertical fastener 108 outward. After the fastener slides horizontally, it relies on the complementary wedge surface to generate active upward and downward vertical pre-tightening pressure to complete the rigid locking of the upper and lower snaps.

[0112] Nut 128 is located on the exposed side of the column, eliminating the need to enter the cavity for operation. All tightening work is completed outside the component, and no operating space is required for the internal wedge surface and fasteners.

[0113] All tightening operations are completed on the outside of the column, eliminating the need to enter the narrow cavity for work. This provides ample operating space for construction personnel and significantly improves the ease of construction.

[0114] The 128 nut features an external limit support design, ensuring a stable tension transmission path and preventing bolt slippage or fastener loosening. The preload is controllable, allowing for the application of specified preload torque according to structural design standards, and the node load-bearing capacity is standardized and controllable.

[0115] According to one embodiment of the present invention, the open end face of the upper fastener 104 and the open end face of the lower fastener 106 are both machined planes, and the two achieve rigid contact and fit directly without the use of a sealing element.

[0116] In one embodiment of the present invention, after the upper and lower buckles are hoisted and closed, the two precision planes are directly and rigidly metal-bonded in contact, without adding any isolation components such as rubber pads, metal gaskets, or waterproof seals in the middle. The internal sealing and protection of the cavity is achieved by relying on the tight bonding of the metal surfaces.

[0117] According to one embodiment of the present invention, the vertical fastener 108 and the upper wedge-shaped force-bearing surface 112 and the lower wedge-shaped force-bearing surface 114 are completely covered inside the receiving cavity and are not exposed.

[0118] In one embodiment of the present invention, the upper and lower snap fasteners are engaged to form a complete closed cavity. The entire vertical fastener 108 and all the wedge-shaped inclined surfaces of the four walls of the snap fasteners are enclosed and housed inside the cavity. Only the horizontal bolts 110 and nuts 128 are exposed on the outside of the column. All other force transmission and locking structures are covered by the snap fasteners and the column, and the wedge surfaces and fasteners cannot be observed from the outside.

[0119] The cavity is enclosed by a snap-fit ​​rectangular ring, with no large openings connecting outwards. Only a small splicing threaded channel for the transverse bolt 110 is reserved, and the channel is filled and sealed by the screw 126.

[0120] This invention provides a box-type column, including an upper steel structure 100, a lower steel structure 102, and a connection node for the steel structure as described above, using built-in wedge-shaped buckles. The upper buckle 104 is fixed to the lower end of the upper steel structure 100, and the lower buckle 106 is fixed to the upper end of the lower steel structure 102.

[0121] According to the steel structural component provided in the second aspect of the present invention, by pre-installing the steel structural component with built-in wedge-shaped snap-fit ​​connection nodes at the ends of the upper steel structural component 100 and the lower steel structural component 102 respectively, the fixing of the steel structural component with built-in wedge-shaped snap-fit ​​connection nodes to the upper steel structural component 100 and the lower steel structural component 102 is completed in the factory. On the construction site, the column connection is achieved by bolt tightening only, eliminating the high-altitude on-site welding process and avoiding the defects of deformation and unstable weld quality caused by on-site welding. Compared with the traditional flange column assembly, the construction efficiency is greatly improved. The steel structural component with built-in wedge-shaped snap-fit ​​connection nodes is completely contained within the column cross-section. After the two column sections are spliced, the outer wall is flat and uniform, which does not occupy the interior space of the building and facilitates the subsequent wall and floor slab construction. Vertical and lateral loads are transferred through the built-in wedge-shaped self-locking structure of the steel structural components connected by built-in wedge-shaped buckles. The two steel structural components are connected only through end buckles. The column body is complete without through openings, preserving the original mechanical properties of the steel in two-way bending and compressive resistance. The overall column bearing stiffness is better than that of the bolted column structure with openings.

[0122] In this embodiment of the invention, the upper steel structure 100 and the lower steel structure 102 can be rectangular closed steel profiles, which are arranged vertically opposite each other as the main vertical load-bearing components of the building.

[0123] The steel structural components are connected by built-in wedge-shaped buckles at the joint position of the two columns. The upper buckle 104 inside the node is fixedly connected to the lower end face of the upper steel structural component 100, and the lower buckle 106 is fixedly connected to the upper end face of the lower steel structural component 102.

[0124] The upper fastener 104 and the lower fastener 106 can be opened and joined on site to form a receiving cavity. The cavity is equipped with vertical fasteners 108, which, together with the horizontal bolts 110, form a locking force transmission structure. The two columns rely on this node to achieve a vertical rigid connection, and the whole assembly forms a complete steel structure force system.

[0125] See Figure 11 A second aspect of the present invention provides an installation method for a steel structural member using a built-in wedge-shaped snap-fit ​​connection node as described above, comprising: Step 10: In the factory, the closed top surface 122 of the upper fastener 104 is fixedly welded to the lower end of the upper steel structure 100, and the closed bottom surface 124 of the lower fastener 106 is fixedly welded to the upper end of the lower steel structure 102; and the vertical fastener 108 is pre-inserted into the cavity of the upper fastener 104 or the lower fastener 106. Step 20: After being transported to the site, the upper steel structure component 100 is hoisted so that the opening surface of the upper fastener 104 is aligned with the opening surface of the lower fastener 106 and fits together to form a receiving cavity. Step 30: Pass the horizontal bolt 110 through the bolt hole on the side wall of the fastener and thread it with the internal vertical fastener 108. Tighten the horizontal bolt 110 and drive the vertical fastener 108 to engage with the upper wedge-shaped force-applying surface 116 and the upper wedge-shaped force-receiving surface 112, and the lower wedge-shaped force-applying surface 118 and the lower wedge-shaped force-receiving surface 114 through the wedge-shaped engagement. This will lock the upper fastener 104 and the lower fastener 106 vertically and rigidly, completing the welding-free assembly on site.

[0126] According to the third aspect of the present invention, the installation method for steel structural components using built-in wedge-shaped snap-fit ​​connection nodes allows all welding processes to be transferred to a standardized factory workshop. The welding environment and flaw detection conditions are controllable, ensuring stable weld bearing capacity and forming quality. This eliminates weld defects and component welding deformation caused by on-site high-altitude welding, significantly improving the overall quality of the steel structure project. Vertical fasteners 108 are pre-installed into the snap-fit ​​cavities in the factory, eliminating the need for manual placement of components in confined spaces on-site. This simplifies high-altitude operations, reduces safety risks, and increases on-site assembly speed. On-site installation only requires two basic processes: hoisting and alignment, and bolt tightening. On-site welding is eliminated, and welding machines, gas cylinders, and fire protection equipment are not needed. This significantly reduces the difficulty of on-site safety management and shortens the assembly period for individual columns, improving the overall construction efficiency of prefabricated buildings.

[0127] Please continue reading Figure 11 The installation method for the steel structural member using a built-in wedge-shaped snap-fit ​​connection node provided in the third aspect embodiment of the present invention includes the following steps: Step 10 is the first stage of factory prefabrication: Separately process the standard components of the upper buckle, lower buckle, vertical fastener 108, and horizontal bolt 110; continuously and fully weld the top surface 122 of the upper buckle to the four sides of the lower end of the upper steel structure component 100; The bottom surface 124 of the lower buckle is fully welded to the four sides of the upper end of the lower steel structure component 102 for flaw detection. The corner and middle vertical fasteners 108 are placed in the upper or lower semi-enclosed cavity of the clip in advance to temporarily limit them and prevent them from falling off during transportation. After prefabrication, they are transported to the construction site in a unified manner.

[0128] Steps 20 and 30 constitute the second stage of on-site assembly operations: First, vertically level and fix the lower steel structure component 102 into place; The upper steel structure component is hoisted by a lifting device and slowly lowered. The horizontal and vertical positions of the column are adjusted so that the precision opening plane of the upper buckle is completely aligned and fitted with the precision opening of the lower buckle. The two halves of the buckle are closed to form a sealed cavity. Align and splice the semi-threaded holes 120 to form a complete threaded channel, insert the transverse bolt 110 horizontally into the threaded hole from the outside, and screw 126 into the side thread of the internal vertical fastener 108. Using a torque wrench, tighten nut 128 to the designed torque. Nut 128 abuts against the outer wall of the buckle and pulls the fastener to slide horizontally. The upper and lower complementary wedge surfaces squeeze each other to generate a bidirectional vertical component force, thus completing the vertical rigid locking of the upper and lower buckles. The entire on-site operation process involves no welding or hot work procedures, and the assembly is completed before proceeding directly to the next construction step.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel structural member with a built-in wedge-shaped snap-fit ​​connection node, characterized in that, The system includes an upper fastener, a lower fastener, vertical fasteners, and horizontal bolts. The upper fastener is fixed to the lower end of the upper steel structure component. The interior of the upper fastener is a semi-enclosed cavity with only one opening facing downwards, and the inner wall of the upper fastener has an upper wedge-shaped force-bearing surface. The lower fastener is fixed to the upper end of the lower steel structure component. The interior of the lower fastener is also a semi-enclosed cavity with only one opening facing upwards, and the inner wall of the lower fastener has a lower wedge-shaped force-bearing surface. The opening surfaces of the upper and lower fasteners are fitted together to form a receiving cavity. The vertical fastener is placed in the receiving cavity. The upper end of the vertical fastener is provided with an upper wedge-shaped force-applying surface that mates with the upper wedge-shaped force-bearing surface, and the lower end of the vertical fastener is provided with a lower wedge-shaped force-applying surface that mates with the lower wedge-shaped force-bearing surface. The horizontal bolt passes through the side wall of the upper and / or lower fastener in the horizontal direction and is connected to the vertical fastener. The horizontal bolt is used to drive the vertical fastener to move horizontally, so as to generate a vertical component force through the squeezing action of the wedge-shaped surface, thereby locking the upper and lower fasteners vertically.

2. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to claim 1, characterized in that, Semi-threaded holes are provided on the side wall opening end face of the upper fastener and the side wall opening end face of the lower fastener. When the upper fastener and the lower fastener are engaged, the semi-threaded hole engages to form a complete threaded hole through which the transverse bolt passes.

3. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to claim 1, characterized in that, Both the upper and lower wedge-shaped force-bearing surfaces are inwardly inclined. Both the upper and lower wedge-shaped force-applying surfaces are inclined surfaces whose shapes are complementary to the corresponding wedge-shaped force-receiving surfaces; When the horizontal bolt is tightened, the vertical fastener generates a vertical motion component while moving horizontally to press the upper and lower buckles together.

4. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to claim 3, characterized in that, The vertical fastener has a threaded hole on the side facing the sidewall of the buckle, and the screw of the horizontal bolt is screwed into the threaded hole to achieve a lateral pulling engagement.

5. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to claim 1, characterized in that, The outer periphery of the upper fastener is flush with the outer periphery of the upper steel structure, and the outer periphery of the lower fastener is flush with the outer periphery of the lower steel structure, so that the connection node is completely hidden within the cross-sectional projection of the steel structure.

6. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to claim 5, characterized in that, The upper fastener has a closed top surface, which is fully welded to the lower end surface of the upper steel structure component; the lower fastener has a closed bottom surface, which is fully welded to the upper end surface of the lower steel structure component.

7. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to any one of claims 1 to 6, characterized in that, Both the upper and lower fasteners are rectangular cross-section blocks, and the opening surfaces of both the upper and lower fasteners are rectangular annular surfaces.

8. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to claim 7, characterized in that, The vertical fastener is an independent block-shaped or frame-shaped component, including corner vertical fasteners disposed at the corners of the receiving cavity and / or central vertical fasteners disposed in the middle of the receiving cavity.

9. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to claim 8, characterized in that, The vertical fastener has multiple upper wedge-shaped force-applying surfaces and lower wedge-shaped force-applying surfaces arranged around its perimeter.

10. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to claim 9, characterized in that, Multiple sets of the horizontal bolts are arranged along the circumference of the fastener, and each set of the horizontal bolts is connected to one of the vertical fasteners. Alternatively, one of the vertical fasteners may be connected to multiple sets of the horizontal bolts.

11. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to any one of claims 1 to 6, characterized in that, The upper buckle has upper wedge-shaped force-bearing surfaces machined around its four inner walls, and the lower buckle has lower wedge-shaped force-bearing surfaces machined around its four inner walls, with the upper and lower wedge-shaped force-bearing surfaces tilting in opposite directions.

12. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to any one of claims 1 to 6, characterized in that, The transverse bolt includes a threaded rod and a nut located outside the side wall of the fastener. Tightening the nut externally applies an active vertical preload to the vertical fastener.

13. The steel structural member with built-in wedge-shaped snap-fit ​​connection node according to any one of claims 1 to 6, characterized in that, The vertical fastener and the upper and lower wedge-shaped force-bearing surfaces are completely enclosed inside the receiving cavity and are not exposed.

14. A method for installing steel structural members using built-in wedge-shaped snap-fit ​​connection nodes as described in any one of claims 1 to 13, characterized in that, include: In the factory, the closed top surface of the upper fastener is fixedly welded to the lower end of the upper steel structure, and the closed bottom surface of the lower fastener is fixedly welded to the upper end of the lower steel structure; and vertical fasteners are pre-placed into the cavity of the upper or lower fastener. After being transported to the site, the upper steel structure is hoisted so that the opening surface of the upper fastener is aligned with the opening surface of the lower fastener and fits together to form the receiving cavity. The horizontal bolt is passed through the bolt hole on the side wall of the buckle and threaded to the internal vertical fastener. The horizontal bolt is tightened, and the vertical fastener is driven to cooperate through the wedge surfaces of the upper wedge force application surface and the upper wedge force receiving surface, and the lower wedge force application surface and the lower wedge force receiving surface, thereby rigidly locking the upper buckle and the lower buckle along the vertical direction, completing the welding-free assembly on site.

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