A column connection node based on 3D printed standard connectors

Abstract

This utility model discloses a column connection node based on a 3D-printed standard connector, comprising two vertically stacked support members. The upper and lower vertical support members are connected by a standard connector, which includes a horizontally positioned intermediate connecting plate. The intermediate connecting plate has a first connecting portion for connecting to the upper vertical support member and a second connecting portion for connecting to the lower vertical support member. Both the first and second connecting portions include an L-shaped reinforcing connecting portion for connecting to the vertical support member, a first vertical connecting plate, and a second vertical connecting plate. The vertical support member is connected to the standard connector by bolts, with all threaded holes being oblique threads. This utility model solves the problem that existing square steel pipe connection nodes cannot simultaneously achieve structural connection reliability and ease of assembly.

Description

Technical Field

[0001] This utility model relates to the field of steel structure connection technology, specifically to a square steel tube connection node based on 3D printed standard connectors. Background Technology

[0002] Square steel tubes, with their excellent cross-sectional properties and architectural adaptability, have become an important component of modern steel structures and are widely used in large-span spatial structures. However, their closed cross-sectional characteristics pose a great challenge to the design of connection nodes. As a key hub for force transmission, the connection nodes directly affect structural safety and construction efficiency.

[0003] The existing column connection nodes often adopt the following two connection methods: (1) Welded connection, which ensures the reliability of component connection without weakening the load-bearing area of ​​the column wall. However, this method of installation is irreversible, which is contrary to the concept of sustainable construction of prefabricated buildings. Moreover, the heat-affected zone causes the column wall strength loss to be ≥10%. (2) Operating holes are opened on the side wall of the square steel tube, and the connection is made by using connectors through the operating holes. Although this method is convenient for disassembly and assembly, it causes a 15%-20% loss of the column wall cross-sectional area and a 20%-30% reduction in load-bearing capacity. In summary, the existing technical solutions cannot take into account both the reliability of structural connection and the convenience of assembly. Utility Model Content

[0004] This utility model proposes a column connection node based on 3D printed standard connectors, the purpose of which is to solve the problem that existing square steel pipe connection nodes cannot simultaneously ensure structural connection reliability and ease of assembly.

[0005] The technical solution of this utility model is as follows:

[0006] A column connection node based on 3D printed standard connectors includes two vertically stacked support members. The upper and lower vertical support members are connected by standard connectors. The standard connectors include a horizontally positioned intermediate connecting plate. The intermediate connecting plate has a first connecting part for connecting to the upper vertical support member and a second connecting part for connecting to the lower vertical support member. The first and second connecting parts are symmetrically positioned on the upper and lower sides of the intermediate connecting plate. The first and second connecting parts include an L-shaped reinforcing connecting part that mates with an inner corner of a square steel tube. The L-shaped reinforcing connecting part mates with the first inner corner of the square steel tube. The first and second connecting parts also include a first vertical connecting plate and a second vertical connecting plate vertically positioned on the intermediate connecting plate. The first and second vertical connecting plates are perpendicular to each other and mate with the outer corner of the square steel tube opposite the first inner corner. The vertical support members are connected to the standard connectors by bolts, and the threaded holes are all oblique threaded holes.

[0007] Furthermore, the two right-angled ends of the L-shaped reinforcing connection are provided with reinforcing ribs.

[0008] Furthermore, the thickness of the first vertical connecting plate and the second vertical connecting plate is the same as that of the intermediate connecting plate, both being 20mm.

[0009] Furthermore, the vertical support member is one set of square steel pipes or multiple sets of square steel pipes.

[0010] Furthermore, the outer contour of the intermediate connecting plate is consistent with the outer contour shape of the cross-section of the vertical support member, and the outer contour dimension of the intermediate connecting plate is equal to or 10 mm larger than the outer contour dimension of the cross-section of the vertical support member.

[0011] Furthermore, the vertical support member is connected to the first vertical connecting plate, the second vertical connecting plate, and the L-shaped reinforcing connecting part by bolts with a tensile strength of 1000MPa, and the bolts are arranged alternately vertically.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] (1) The standard connector of this utility model improves the local strength and deformation resistance of the square steel pipe by setting an L-shaped reinforcing connection part to match the first inner corner of the square steel pipe, and can disperse stress, thereby preventing damage to the connection part caused by local stress concentration. The vertical stiffness of the connection node is improved by the mutual perpendicular arrangement of the first vertical connecting plate and the second vertical connecting plate to match the outer corner of the square steel pipe opposite to the first inner corner. At the same time, the intermediate connecting plate realizes the bidirectional rapid and accurate positioning of the square steel pipe in both horizontal and vertical directions, which greatly simplifies the connection process of the square steel pipe and realizes the rapid positioning and assembly of the square steel pipe and the standard connector.

[0014] (2) This utility model adopts 3D printing technology, which can realize the overall manufacturing of complex shapes and internal structures of connectors. It not only ensures the integrity of the structural performance of connectors during processing, but also avoids the problems of deformation and stress concentration caused by multiple processes such as cutting, grinding, positioning and welding in traditional processing methods. It also realizes precise control of material use. The standard connector is a horizontally laid-out 3D printed integral molding, with the interlayer bonding surface parallel to the direction of force. It is heat treated at 850℃ for 2 hours to eliminate anisotropy, which can realize reliable force transmission and precise splicing, and significantly improve the stability and reliability of the structure.

[0015] (3) The first vertical connecting plate, the second vertical connecting plate and the L-shaped reinforcing connecting part of the standard connector are provided with bolt connection holes with oblique threads, which can effectively make them mesh with the oblique threads on the high-strength bolts. Combined with the high-strength bolts arranged in an alternating manner, the upper and lower vertical support components are rigidly connected, which can reliably transmit the axial force and shear force in the length and width directions of the box and the bending moment in the length direction of the box. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the standard connector in an embodiment of the present utility model (the vertical support component is four groups of square steel pipes arranged in a matrix).

[0017] Figure 2 To adopt Figure 1 The diagram shows a standard connector used for column connection nodes.

[0018] Figure 3 for Figure 2 Sectional view of AA in the middle;

[0019] Figure 4 This is a variant of the standard connector in the embodiments of this utility model (the vertical support member is a set of square steel pipes).

[0020] Figure 5 This is a variant two of the standard connector in the embodiments of this utility model (the vertical support member consists of two sets of square steel pipes).

[0021] Figure 6 This is a variant three of the standard connector in the embodiments of this utility model (the vertical support component is three sets of square steel pipes).

[0022] Explanation of reference numerals in the attached figures:

[0023] 100. Square steel pipe; 200. Standard connector; 210. First vertical connecting plate; 220. Second vertical connecting plate; 230. Intermediate connecting plate; 240. L-shaped reinforced connecting part; 241. Reinforcing rib. Detailed Implementation

[0024] The technical solution and effects of this utility model will be described in detail below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0025] like Figure 1 and Figure 2 As shown, a column connection node based on 3D printed standard connectors includes vertical support members stacked one on top of the other, with the upper vertical support member and the lower vertical support member connected by a standard connector 200.

[0026] Combination Figure 3As shown, the standard connector 200 includes a horizontally arranged intermediate connecting plate 230. The intermediate connecting plate 230 includes a first connecting portion for connecting to an upper vertical support member and a second connecting portion for connecting to a lower vertical support member. The first and second connecting portions are symmetrically arranged on the upper and lower sides of the intermediate connecting plate 230. The first and second connecting portions include an L-shaped reinforcing connecting portion 240 that mates with an inner corner of the square steel tube 100. Reinforcing ribs 241 are provided at the ends of the two right-angled sides of the L-shaped reinforcing connecting portion 240. The L-shaped reinforcing connecting portion 240 mates with the first inner corner of the square steel tube 100 to improve its local strength and resistance to deformation. The first and second connecting portions also include a first vertical connecting plate 210 and a second vertical connecting plate 220 vertically arranged on the intermediate connecting plate 230. The first vertical connecting plate 210 and the second vertical connecting plate 220 are perpendicular to each other and mate with the outer corner of the square steel tube 100 opposite to the first inner corner to improve the vertical stiffness of the connection node. The L-shaped reinforcing connecting part 240, together with the first vertical connecting plate 210 and the second vertical connecting plate 220, and the intermediate connecting plate 230, enables rapid positioning of the square steel tube 100 in both the horizontal and vertical directions. Preferably, the thickness of the first vertical connecting plate 210 and the second vertical connecting plate 220 is the same as the thickness of the intermediate connecting plate 230, which is 20mm.

[0027] The vertical support components are connected to the standard connector 200 by bolts, and all of their threaded holes are oblique threads. To prevent installation interference, the bolts are arranged in an alternating pattern. Preferably, the threaded holes on the first vertical connecting plate 210, the second vertical connecting plate 220, and the L-shaped reinforcing connecting part 240 are all oblique threads.

[0028] Combination Figures 4-6 As shown, the standard connector 200 is applicable to vertical support members that are one or more sets of square steel pipes 100 arranged vertically. The outer contour shape of the intermediate connecting plate 230 of the standard connector 200 is consistent with the outer contour shape of the cross-section of the vertical support member, and the outer contour dimension of the intermediate connecting plate 230 is equal to or 5mm larger than the outer contour dimension of the cross-section of the vertical support member.

[0029] The standard connector 200 based on 3D printing described in this embodiment of the invention employs horizontal lay-up printing, ensuring that the interlayer bonding surfaces are parallel to the receiving direction. Depending on the number and combination of the selected square steel tubes 100, corresponding variants can be selected, allowing connection of one or more stacked square steel tubes 100. This keeps the connecting ends of the square steel tubes 100 on the same horizontal plane, resisting and transmitting horizontal loads. The first vertical connecting plate 210 and the second vertical connecting plate 220 are vertically attached to the outer walls of the upper and lower steel tubes 100, respectively.

[0030] The following examples illustrate the processing and assembly methods of the column connection node components described in this utility model embodiment.

[0031] In the workshop, square steel pipe 100 and standard connector 200 are processed. Standard connector 200 uses 316L stainless steel powder, laser selective melting horizontal layup printing with a layer thickness of 0.05mm, followed by argon protection heat treatment at 850℃ for 2 hours. At the installation site, the lower square steel pipe 100 is hoisted into position and leveled. Then, the connector is inserted into the upper end of the lower square steel pipe 100. Next, the lower end of the upper square steel pipe 100 is fitted onto the first connecting part of the connector, and a high-strength bolt with a 1000MPa tensile strength and oblique thread is used for connection. The preload is controlled by a torque wrench to ≥160±10N·m.

[0032] In this embodiment, the standard connector 200 can be used to connect one or more sets of square steel pipes 100 arranged symmetrically on the top and bottom. It can be applied to the construction of prefabricated steel structures, such as multi-story box houses and prefabricated residential buildings, and can significantly improve the connection strength of nodes and assembly efficiency.

[0033] It should be noted that, as will be apparent to those skilled in the art, this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. The scope of this utility model is defined by the claims rather than the foregoing description.

Claims

1. A column connection node based on a 3D-printed standard connector, comprising two vertically stacked support members, wherein the upper vertical support member and the lower vertical support member are connected by a standard connector (200), characterized in that: The standard connector (200) includes a horizontally arranged intermediate connecting plate (230); the intermediate connecting plate (230) is provided with a first connecting part for connecting with the upper vertical support member and a second connecting part for connecting with the lower vertical support member, the first connecting part and the second connecting part are symmetrically arranged on the upper and lower sides of the intermediate connecting plate (230); the first connecting part and the second connecting part include an L-shaped reinforcing connecting part (240) that matches an inner angle of the square steel pipe (100), the L-shaped reinforcing connecting part (240) matches the first inner angle of the square steel pipe (100), the first connecting part and the second connecting part also include a first vertical connecting plate (210) and a second vertical connecting plate (220) that are vertically arranged on the intermediate connecting plate (230), the first vertical connecting plate (210) and the second vertical connecting plate (220) are perpendicular to each other, and are used to match the outer angle of the square steel pipe (100) opposite to the first inner angle; the vertical support member is connected to the standard connector (200) by bolts, and the threaded holes are all oblique threaded holes.

2. The column connection node based on 3D printed standard connectors as described in claim 1, characterized in that: The two right-angled ends of the L-shaped reinforcing connector (240) are provided with reinforcing ribs (241).

3. The column connection node based on 3D printed standard connectors as described in claim 1, characterized in that: The thickness of the first vertical connecting plate (210) and the second vertical connecting plate (220) is the same as that of the intermediate connecting plate (230), both being 20mm.

4. The column connection node based on 3D printed standard connectors as described in claim 1, characterized in that: The vertical support component is one set of square steel pipes (100) or multiple sets of square steel pipes (100).

5. The column connection node based on 3D printed standard connectors as described in claim 1, characterized in that: The outer contour of the intermediate connecting plate (230) is consistent with the outer contour shape of the cross-section of the vertical support member, and the outer contour dimension of the intermediate connecting plate (230) is equal to or 10 mm larger than the outer contour dimension of the cross-section of the vertical support member.

6. The column connection node based on 3D printed standard connectors as described in claim 1, characterized in that: The vertical support member is connected to the first vertical connecting plate (210), the second vertical connecting plate (220) and the L-shaped reinforcing connecting part (240) by bolts with a tensile strength of 1000MPa, and the bolts are arranged alternately up and down.

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