Fabricated connecting node for chord member and web member of circular steel tube truss structure
By using clamp connections and high-strength bolt tightening in the circular steel pipe truss structure, the problem of welding connections is solved, enabling rapid, efficient assembly and high-strength connection of the circular steel pipe truss, which is suitable for fields such as construction and agricultural greenhouses.
Patent Information
- Application Number
- CN202423150577.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-20
AI Technical Summary
In existing technologies, the connection between the chords and web members of a circular steel tube truss structure mainly relies on welding, which results in high processing requirements, inconvenience for transporting small parts and on-site assembly, and difficulty in controlling the quality of high-altitude welding.
The chord and web members are connected by clamps, which are then tightened with high-strength bolts to achieve an assembly connection. The web members are bent to maintain continuity.
It enables rapid assembly and high-strength connection of circular steel tube truss structures, reduces welding requirements, improves construction efficiency and quality control, and is suitable for various structural types.
Smart Images
Figure CN223824334U_ABST
Abstract
Description
Technical Field
[0001] This invention is applicable to fields such as building structures and agricultural greenhouse structures. Specifically, it includes planar trusses, spatial trusses, towers, and lattice columns in building structures, as well as agricultural greenhouses. Background Technology
[0002] Circular steel pipes are polar-symmetric and have a large moment of inertia for the same cross-sectional area, making them excellent axially loaded structural members. They are widely used in architectural structures such as planar trusses, space trusses, towers, and lattice columns. Agricultural greenhouses mainly use steel pipe structures, which limits their span; large-span greenhouses often employ planar truss structures.
[0003] In structures using round steel tube lattice structures, the connection between chord members and web members is mainly by welding, which requires high processing and manufacturing standards. A large amount of welding work can only be completed in the factory, which is inconvenient for transporting small parts and assembling on site. The on-site assembly of the assembly units involves some high-altitude welding work, resulting in high construction difficulty and difficulty in quality control. Summary of the Invention
[0004] The purpose of this invention is to provide an assembled connection node that is easy to install, reliable in terms of stress, and used for connecting chords and web members in a circular steel tube truss structure.
[0005] This invention is achieved through the following measures: a prefabricated connection node for a circular steel pipe truss structure, characterized in that the web members and chord members are connected by clamps, and the clamps are respectively provided with slots of the same diameter as the chord members and web members, the perimeter of the slots being smaller than the perimeter of the corresponding chord members and web members, and the connection between the clamps and the chord members and web members is achieved by tightening high-strength bolts.
[0006] This type of circular steel tube truss structure can be a planar truss structure or a spatial truss structure. The chord members are circular steel tubes, and the web members are circular steel or circular steel tubes. The chord members are straight or curved depending on the shape of the truss. The web members change direction by bending and remain continuous at the nodes. The ability of the web members to remain continuous at the nodes is one of the characteristics of this type of structure.
[0007] The clamp is divided into different block units by the center line connecting the chord members and web members, and the number of units is related to the number of web members connected.
[0008] In planar truss structures, clamps are connected to single web members, and each clamp consists of two half-units. The basic type of clamp is located at the end of the chord member. Depending on the diameter of the connected chord tube and the magnitude of the force, it is divided into two basic forms: open type and pin type. For chord members with small diameters and relatively small unbalanced forces along the chord direction at the node, the open type is used; for chord members with large diameters and relatively large unbalanced forces along the chord direction at the node, the pin type is used.
[0009] An open-type clamp connects a single chord and a single web member. It consists of two nearly symmetrical half-units. The slots are of the same diameter as the chord and web member, respectively, and the perimeter of the slots is smaller than the perimeter of the corresponding chord and web member. There is a gap between the slots to allow high-strength bolts to pass through. The chord and web member pass through the slots, the clamp is fastened, and the high-strength bolts are tightened. Through the tension provided by the high-strength bolts, the clamp is connected to the chord and web member through the friction between them.
[0010] The pin-type clamp differs from the open type in that a pin is installed at the end of the chord member. It is suitable for situations where the chord member has a large diameter and there is a large unbalanced force along the chord member direction at the node.
[0011] Depending on whether there are out-of-plane tie rods, cross braces, purlin supports, connectors, etc. connected to the node, different derivative forms of clamps appear on the basis of the basic type.
[0012] A planar truss node with tie rods connected outside the plane, wherein the clamp is provided with vertical connecting lugs connected to the tie rods based on the basic model.
[0013] A node of a planar truss that is simultaneously connected to tie rods and cross braces outside the plane, wherein the clamp is provided with vertical and horizontal connecting lugs that are connected to the tie rods and cross braces based on the basic model.
[0014] A planar truss node is connected to a purlin support. The clamp is based on the basic model, but the upper structure is adjusted, the pin is removed, and a high-strength bolt is installed for fastening. A connecting plate for bolt connection is extended upwards.
[0015] A planar truss has a connector at the node, and the clamp is adjusted on the basis of the basic model, the pin is eliminated, a high-strength bolt is installed for fastening, and a support plate for welding is extended upward.
[0016] In a space truss structure, clamps are connected to multiple web members. The clamp is composed of multiple modular units, the number of which is related to the number of web members being connected. The angle formed by the lines connecting the centers of the web member slots and the chord member slots is equal to the angle between the web members. The clamp modular units take on different shapes based on the spatial positions of the connected chords and web members, while ensuring the slot positions, high-strength bolt installation, and overall clamp stiffness.
[0017] A triangular space truss is described, with round steel tubes for both chords and web members. The chords can be straight or curved depending on the truss shape, while the web members change direction through bending and maintain continuity at the nodes. The clamps consist of three parts: two nearly symmetrical sections hold the chords in place, and a third section holds the web members in place. The sections are connected by high-strength bolts located between the chords and web members. The shape of the clamps varies depending on the diameters of the chords and web members and the angles between them.
[0018] Another type of triangular space truss uses round steel tubes for both the chords and web members. The chords can be straight or curved depending on the truss shape. For web members with different tube diameters, the bending radius and shape are determined based on the material properties to ensure a smooth, undeformed cross-section. The web members change direction through bending and maintain continuity at the nodes. The clamps consist of three parts: two nearly symmetrical sections hold the chords in place, and a third section holds the web members in place. The sections are connected by high-strength bolts located between the chords and web members. The shape of the clamps varies depending on the diameters of the chords and web members and the angles between them. The web members are bent round steel tubes, ensuring continuity at the nodes.
[0019] A rectangular space truss is disclosed, with chord members made of round steel pipes and web members made of round steel or round steel pipes. The web members are connected to the chord members via clamps, which are also connected to the two web members. Each clamp consists of three modular units: two units hold the chord member and one of the web members, and a third unit holds the other web member. The angle formed by the lines connecting the slots of the two web members and the slot of the chord member is equal to the angle between the web members, forming a 90° angle. The clamp modular units are L-shaped, based on the spatial positions of the connected chord and web members, while ensuring proper slot placement, high-strength bolt installation, and overall clamp rigidity.
[0020] In existing technologies, the connections between members in planar and spatial circular steel tube truss structures are mostly welded, requiring intersecting cuts at the ends of the members. The welding process is relatively complex, and member-level assembly is often completed in factories, which is inconvenient for transporting small parts and on-site assembly. On-site welding also presents disadvantages such as high-altitude work and difficulty in guaranteeing welding quality. Compared with existing technologies, the advantages of this invention are: the web members achieve direction change through bending while maintaining continuity at the nodes, greatly reducing the number of web members. Combined with existing technologies and utilizing a special structure, rapid member-level assembly can be achieved, effectively solving the connection problems between circular steel tubes and between circular steel tubes themselves. This allows circular steel tubes, excellent axial load-bearing components, to utilize prefabricated connection nodes extensively, in addition to traditional welding connections, to realize structures such as planar trusses, spatial trusses, towers, lattice columns, and agricultural greenhouses. Attached Figure Description
[0021] Figure 1 This refers to the basic type of open-type clamp and its typical assembly nodes.
[0022] Figure 2 This refers to the basic type of pin-shaft clamp and its typical assembly nodes.
[0023] Figure 3 This refers to an out-of-plane connection with a tie rod and a typical assembly node.
[0024] Figure 4 This refers to a clamp with ear plates and its typical assembly nodes that are simultaneously connected to tie rods and cross supports outside the plane.
[0025] Figure 5 It consists of a purlin support at the top, a connecting plate, a clamp, and a typical assembly node.
[0026] Figure 6 It consists of a connecting plate clamp and its typical assembly nodes, which are connected to the upper part by a connector.
[0027] Figure 7 This refers to the type I triangular space truss clamp and its typical assembly nodes.
[0028] Figure 8 This refers to the type II triangular space truss clamp and its typical assembly nodes.
[0029] Figure 9 This refers to rectangular space truss clamps and their typical assembly nodes.
[0030] Figure 10 It is a typical planar truss unit.
[0031] Figure 11 It is a typical type I triangular space truss unit.
[0032] Figure 12 It is a typical Type II triangular space truss unit.
[0033] Figure 13 It is a typical rectangular space truss unit.
[0034] The attached figures are labeled as follows: 1. Open basic type clamp unit; 2a. Pin-shaft basic type clamp unit a; 2b. Pin-shaft basic type clamp unit b; 3a. Clamp unit a with lugs connected to tie rods outside the plane; 3b. Clamp unit b with lugs connected to tie rods outside the plane; 4a. Clamp unit a with lugs connected to both tie rods and cross supports outside the plane; 4b. Clamp unit b with lugs connected to both tie rods and cross supports outside the plane; 5a. Clamp unit a with connecting plate connected to purlin supports at the top; 5b. Clamp unit b with connecting plate connected to purlin supports at the top; 6a. Clamp unit a with connecting plate connected to a connector at the top; 6b. Clamp unit b with connecting plate connected to a connector at the top; 7 a. Type I triangular space truss clamp unit a; 7b. Type I triangular space truss clamp unit b; 7c. Type I triangular space truss clamp unit c; 8a. Type II triangular space truss clamp unit a; 8b. Type II triangular space truss clamp unit b; 8c. Type II triangular space truss clamp unit c; 9a. Rectangular space truss clamp unit a; 9b. Rectangular space truss clamp unit b; 9c. Rectangular space truss clamp unit c; 1a. Pin; 1b. High-strength bolt; 1c. Vertical ear plate; 1d. Horizontal ear plate; 1e. Support plate; 1f. Stiffener; 1g. Connecting plate; 10. Round steel tube chord; 11. Web member; 12. Tie rod; 13. Cross brace; 14. Connector; 15. Purlin. Detailed Implementation
[0035] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to describe the solution.
[0036] Example 1:
[0037] See Figure 1 , Figure 10 A planar truss structure with prefabricated connection nodes, where web members 11 and chord members 10 are connected by clamps. Open basic type clamps are used to connect single chord members 10 and single web members 11. The clamp is composed of two open basic type clamp units 1, with slots having the same diameter as the chord members 10 and web members 11, respectively. The perimeter of the slots is smaller than the perimeter of the corresponding chord members 10 and web members 11, and there is a gap between the slots to allow high-strength bolts 1b to pass through. The chord members 10 and web members 11 pass through the slots, and the high-strength bolts 1b are tightened. The high-strength bolts provide tension. The clamps are connected to the chord members 10 and web members 11 through the friction between them.
[0038] The chord member 10 is a round steel tube, and the web member 11 is a round steel or a round steel tube. The chord member 10 is straight or curved depending on the shape of the truss. The web member 11 changes direction by bending and remains continuous at the nodes. The ability of the web member 11 to remain continuous at the nodes is one of the characteristics of this type of structure.
[0039] The planar truss with open basic type clamps has a smaller diameter of chord 10 and a smaller unbalanced force along the chord direction at the node.
[0040] Example 2:
[0041] See Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 10 A planar truss structure with prefabricated connection nodes. Web members 11 and chord members 10 are connected by clamps. The basic pin-type clamp unit consists of two basic pin-type clamp units a. The out-of-plane clamp units with tie rods and ear plates consist of out-of-plane clamp unit a and out-of-plane clamp unit b. The out-of-plane clamp units with both tie rods and cross braces consist of out-of-plane clamp unit a and out-of-plane clamp unit b. The unit consisting of a purlin support and a connecting plate clamp is divided into two parts: unit a, which is supported by a purlin and connected to it, and unit b, which is supported by a purlin and connected to it. The slots are of the same diameter as the chord 10 and the web member 11, respectively. The perimeter of the slots is smaller than the perimeter of the corresponding chord 10 and web member 11. There is a gap between the slots to allow the high-strength bolt 1b to pass through. The chord 10 and the web member 11 pass through the slots and the high-strength bolt 1b is tightened. The high-strength bolt provides tension. The clamp is connected to the chord 10 and the web member 11 through the friction between them.
[0042] The chord member 10 is a round steel tube, and the web member 11 is a round steel or a round steel tube. The chord member 10 is straight or curved depending on the shape of the truss. The web member 11 changes direction by bending and remains continuous at the nodes. The ability of the web member 11 to remain continuous at the nodes is one of the characteristics of this type of structure.
[0043] The tie rod 12, cross brace 13, roof purlin 15, etc. are connected to the clamps by bolts.
[0044] Example 3:
[0045] See Figure 6 , Figure 10A planar truss structure with prefabricated connection nodes. Web members 11 and chord members 10 are connected by clamps. The clamps are of the basic pin type and the clamps with connecting plates connected to them by connecting parts 14. The specific selection of the clamps is determined according to the arrangement of the connecting parts. The clamps connect single chord members 10 and single web members 11. The clamp components are a clamp unit a with connecting plates connected to them by connecting parts and b with connecting plates connected to them by connecting parts. The slots have the same diameter as the chord members 10 and web members 11, and the perimeter of the slots is smaller than the perimeter of the corresponding chord members 10 and web members 11. There is a gap between the slots to allow high-strength bolts 1b to pass through. The chord members 10 and web members 11 pass through the slots and the high-strength bolts 1b are tightened. The high-strength bolts provide tension. The clamps are connected to the chord members 10 and web members 11 through the friction between them.
[0046] The chord member 10 is a round steel tube, and the web member 11 is a round steel or a round steel tube. The chord member 10 is straight or curved depending on the shape of the truss. The web member 11 changes direction by bending and remains continuous at the nodes. The ability of the web member 11 to remain continuous at the nodes is one of the characteristics of this type of structure.
[0047] The connection between connector 14 and the clamp is made by welding. The connector can be a glass splice claw, a curtain wall keel fastener, etc.
[0048] Example 4:
[0049] See Figure 7 , Figure 11 A triangular space truss structure with prefabricated connection nodes is described. Web members 11 and chord members 10 are connected by clamps. The clamps are connected to the two web members 11. The clamp units are I-type triangular space truss clamp unit a, I-type triangular space truss clamp unit b, and I-type triangular space truss clamp unit c. The angle formed by the lines connecting the slots of the two web members 11 and the slots of the chord members 10 is equal to the angle between the web members 11. Based on the spatial positions of the connected chord members 10 and web members 11, and while satisfying the slot positions, the installation of high-strength bolts 1b, and the overall stiffness of the clamp, the clamp unit is triangular in shape.
[0050] Type I triangular space truss clamping unit a and type I triangular space truss clamping unit b clamp the chord 10, and then type I triangular space truss clamping unit c clamps the two web members 11. The units are connected by high-strength bolts 1b, which are located between the chord 10 and the web members 11.
[0051] The chord 10 is made of round steel tube, and the web members 11 are made of round steel. The chord 10 is straight or curved depending on the shape of the truss. The web members 11 change direction by bending and remain continuous at the nodes. The ability of the web members 11 to remain continuous at the nodes is one of the characteristics of this type of structure.
[0052] For cases where other members are connected to the clamps, the spatial clamps should be modified and combined in accordance with the clamp types used for planar trusses.
[0053] Example 5:
[0054] See Figure 8 , Figure 12 A triangular space truss structure with prefabricated connection nodes is described. Web members 11 and chord members 10 are connected by clamps. The clamps are connected to the two web members 11. The clamp units are Type II triangular space truss clamp unit a, Type II triangular space truss clamp unit b, and Type II triangular space truss clamp unit c. The angle formed by the lines connecting the slots of the two web members 11 and the slots of the chord members 10 is equal to the angle between the web members 11. Based on the spatial positions of the connected chord members 10 and web members 11, and while satisfying the slot positions, the installation of high-strength bolts 1b, and the overall stiffness of the clamp, the clamp unit is triangular in shape.
[0055] Type II triangular space truss clamping unit a and Type II triangular space truss clamping unit b clamp the chord 10, and then Type II triangular space truss clamping unit c clamps the two web members 11. The units are connected by high-strength bolts 1b, which are located between the chord 10 and the web members 11.
[0056] The chord member 10 and the web member 11 are both made of round steel tubes. The bending radius and shape of the web members are determined according to the material properties to ensure a smooth and deformation-free cross-section. The chord member 10 can be straight or curved depending on the shape of the truss. The web members 11 change direction through bending and remain continuous at the nodes. The continuity of the web members 11 at the nodes is one of the characteristics of this type of structure.
[0057] For cases where other members are connected to the clamps, the spatial clamps should be modified and combined in accordance with the clamp types used for planar trusses.
[0058] Example 6:
[0059] See Figure 9 , Figure 13 A rectangular space truss structure with prefabricated connection nodes is described. Web members 11 and chord members 10 are connected by clamps. The clamps are connected to the two web members 11. The clamp units are rectangular space truss clamp unit a, rectangular space truss clamp unit b, and rectangular space truss clamp unit c. The angle formed by the lines connecting the slots of the two web members 11 and the slots of the chord members 10 is equal to the angle between the web members 11, forming a 90° angle. Based on the spatial positions of the connected chord members 10 and web members 11, and while satisfying the slot positions, the installation of high-strength bolts 1b, and the overall stiffness of the clamp, the clamp unit is L-shaped.
[0060] Rectangular space truss clamping unit a and rectangular space truss clamping unit b clamp the chord 10 and one of the web members 11, and then the rectangular space truss clamping unit c clamps the other web member 11. The blocks are connected by high-strength bolts 1b, which are located between the chord 10 and the web member 11.
[0061] The chord 10 is made of round steel tube, and the web members 11 are made of round steel or round steel tube. The chord 10 is straight or curved depending on the shape of the truss. The web members 11 change direction by bending and remain continuous at the nodes. The ability of the web members 11 to remain continuous at the nodes is one of the characteristics of this type of structure.
[0062] For cases where other members are connected to the clamps, the spatial clamps should be modified and combined in accordance with the clamp types used for planar trusses.
[0063] In the description of this invention, it should be noted that the terms "planar truss" and "space truss" are not limited to horizontal placement, but can be at any spatial angle. In addition to being placed horizontally as a horizontal load-bearing member in the structure, they can also be placed vertically as a vertical load-bearing member in a tower structure. The form of "space truss" is not limited to triangle and rectangle, and can be arbitrarily combined from planar trusses, triangular trusses, and rectangular trusses. The clamp is not limited to being connected to a single web member or two web members, but can be arbitrarily combined based on clamps connected to a single web member and clamps connected to two web members to generate complex spatial clamps connected to multiple web members.
[0064] It should be noted that, unless otherwise specified, the embodiments and features described in this solution can be combined with each other.
[0065] This invention is applicable not only to building structures and agricultural greenhouse structures, but also to portal traffic sign poles, railway catenary rigid beam structures, lattice power transmission towers, and communication signals that use round steel pipes as the main members.
[0066] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. The above description is not intended to limit the invention, and the invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the invention should also be within the protection scope of the invention.
Claims
1. A prefabricated connection node for chords and web members of a circular steel tube truss structure, characterized in that, The web member (11) and the chord member (10) are connected by a clamp. The clamp is provided with a groove of the same diameter as the chord member (10) and the web member (11). The circumference of the groove is smaller than the circumference of the corresponding chord member (10) and the web member (11). The clamp is connected to the chord member (10) and the web member (11) by tightening the high-strength bolt (1b).
2. The assembled connection node for chords and web members of a circular steel tube truss structure according to claim 1, characterized in that, The circular steel tube truss structure can be a planar truss structure or a spatial truss structure. The chord (10) is a circular steel tube, and the web members (11) are circular steel or circular steel tubes. The chord (10) is straight or curved depending on the shape of the truss, and the web members (11) change direction by bending and remain continuous at the nodes.
3. The assembled connection node between chords and web members of a circular steel tube truss structure according to claim 1, characterized in that, The clamp is divided into different block units by connecting the center of the chord (10) and the web member (11). The number of units is related to the number of web members (11) connected. The chord (10) and the web member (11) pass through the slot on the clamp, fasten the clamp, and tighten the high-strength bolt (1b). The high-strength bolt provides tension. The clamp is connected to the chord (10) and the web member (11) through the friction between them.
4. The assembled connection node between chords and web members of a circular steel tube truss structure according to claim 3, characterized in that, In a planar truss structure, the clamp is connected to the single web member (11). The clamp is divided into two basic types according to whether the end of the chord is equipped with a pin (1a): the open basic type clamp and the pin basic type clamp. The open basic type clamp consists of two open basic type clamp units (1), and the pin basic type clamp consists of pin basic type clamp unit a (2a) and pin basic type clamp unit b (2b).
5. The assembled connection node between chords and web members of a circular steel tube truss structure according to claim 4, characterized in that, Depending on whether there are out-of-plane tie rods (12), cross supports (13), purlins (15), and connectors (14) connected to the node, the clamp is derived from the basic type into clamps with ear plates and clamps with connecting plates. The clamps with ear plates connected to tie rods out of the plane are composed of clamp unit a (3a) and clamp unit b (3b). The clamps with ear plates connected to tie rods and cross supports out of the plane are clamps with ear plates connected to tie rods and cross supports out of the plane. Unit a (4a) and unit b (4b) with ear plate clamps connected to tie rods and cross supports outside the plane are connected to each other. The unit with connecting plate clamps connected to the upper part is unit a (5a) with connecting plate clamps connected to the upper part and unit b (5b) with connecting plate clamps connected to the upper part. The unit with connecting plate clamps connected to the upper part is unit a (6a) with connecting plate clamps connected to the upper part and unit b (6b) with connecting plate clamps connected to the upper part.
6. The assembled connection node for chords and web members of a circular steel tube truss structure according to claim 3, characterized in that, In the spatial truss structure, the clamp is connected to multiple web members (11), and the clamp is composed of multiple units.
7. The assembled connection node for chords and web members of a circular steel tube truss structure according to claim 6, characterized in that, The I-type triangular space truss clamp consists of I-type triangular space truss clamp unit a (7a), I-type triangular space truss clamp unit b (7b), and I-type triangular space truss clamp unit c (7c). I-type triangular space truss clamp unit a (7a) and I-type triangular space truss clamp unit b (7b) clamp the chord (10), and I-type triangular space truss clamp unit c (7c) clamps the web member (11). The clamp as a whole is triangular in shape.
8. The assembled connection node between chords and web members of a circular steel tube truss structure according to claim 6, characterized in that, The type II triangular space truss clamp consists of type II triangular space truss clamp unit a (8a), type II triangular space truss clamp unit b (8b), and type II triangular space truss clamp unit c (8c). Type II triangular space truss clamp unit a (8a) and type II triangular space truss clamp unit b (8b) clamp the chord (10), and then clamp the web member (11) through type II triangular space truss clamp unit c (8c). The clamp as a whole is triangular in shape.
9. The assembled connection node between chords and web members of a circular steel tube truss structure according to claim 6, characterized in that, The rectangular space truss is composed of rectangular space truss clamp unit a (9a), rectangular space truss clamp unit b (9b), and rectangular space truss clamp unit c (9c). Rectangular space truss clamp unit a (9a) and rectangular space truss clamp unit b (9b) clamp the chord (10) and one of the web members (11), and then the rectangular space truss clamp unit c (9c) clamps the other web member (11). The clamp is in the shape of "L".