Novel node for upper chord of net rack rectangular tube

Abstract

The utility model relates to the field of buildings, in particular to a novel net rack rectangular tube upper chord node which comprises a node body located on the lower side face of a net rack, a plurality of web members are connected with the net rack through the node body, the node body comprises a circular steel plate and partial balls, the circular steel plate is horizontally arranged, and the upper side face of the circular steel plate is fixedly connected with the lower side face of the net rack. The opening section of the partial ball is fixedly connected with the lower side face of the circular steel plate, and the upper ends of the web members are fixedly connected with the spherical surface of the partial ball; according to the utility model, the circular steel plate is arranged on the lower flange of the upper chord member of the net rack, the partially hollow steel ball is further welded below the circular steel plate, and the partially hollow steel ball is connected with the web member of the net rack, so that the internal force at the node can be more effectively distributed and transmitted through the combined use of the circular steel plate and the partially hollow steel ball; therefore, the stability and the safety of the whole structure are improved, meanwhile, due to the design of part of the balls, connection with the web members is more uniform and reasonable, and the problem of stress concentration possibly occurring to traditional nodes is avoided.

Description

Technical Field

[0001] The utility model relates to the field of construction, in particular to a new type of upper chord node of a grid rectangular tube. Background Art

[0002] In modern architectural design, especially for public buildings such as theaters, concert halls, and museums, large-span roof structures are often used to meet the needs of spacious column-free spaces. Such buildings usually use grids or trusses as their structural form to meet the dual requirements of both heavy loads and architectural beauty. Especially when the roofs of these large-span structures need to have good sound insulation, waterproofing, and thermal insulation properties, reinforced concrete slabs are often poured on the steel structure roof to achieve the above functions.

[0003] In addition, in these large-span floor structures, in order to directly support the concrete floor, the upper chord of the grid or truss is often designed as a rectangular steel tube. However, the connection technology between the upper chords of the rectangular steel tube and between the upper chord and the web is difficult. The traditional method is to use welded ball nodes or other types of nodes to connect the rectangular steel tube and the web of the roof, but these methods have their own shortcomings. For example, the welded ball node may lead to complex node design, large steel consumption, low construction efficiency, and the protrusion of the welded ball will interfere with the connection structure of the concrete floor.

[0004] Therefore, how to design a new type of grid rectangular tube upper chord node that can not only ensure the safety and reliability of the structure, but also simplify the construction process and optimize the use of materials has become an urgent problem to be solved in the technical field. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a new type of node for the upper chord of a grid rectangular tube.

[0006] The utility model is realized by the following technical solutions:

[0007] A new type of node for the upper chord of a grid rectangular tube comprises: a node is located on the lower side of the grid, and a plurality of webs are connected to the grid through the node, the node comprises: a circular steel plate and a partial ball, the circular steel plate is horizontally arranged, and the upper side of the circular steel plate is fixedly connected to the lower side of the grid, the opening cross section of the partial ball is fixedly connected to the lower side of the circular steel plate, and the upper ends of the plurality of webs are respectively fixedly connected to the spherical surface of the partial ball.

[0008] Specifically, the grid comprises a plurality of upper chord members, the upper chord members are rectangular steel tubes, the lower flange heights of the connection between any two connected upper chord members are the same, and the nodes are fixedly connected to the connection.

[0009] Optionally, all the upper chord levers adopt the same section height, the same or different section widths and the same or different wall thicknesses.

[0010] Optionally, when the upper chord members are connected, the larger upper chord member is set through, the smaller upper chord member is cut and welded to the larger upper chord member, and a reinforcing rib is set inside the larger upper chord member, and the reinforcing rib is located in the same plane as the side plate of the smaller upper chord member.

[0011] Optionally, the circular steel plate is fixedly connected to the lower flange of the upper chord member, and the central axis of the circular steel plate coincides with the center of the connection, and the diameter of the circular steel plate is larger than the diameter of the opening cross section of the partial sphere.

[0012] Optionally, the thickness of the circular steel plate is equal to the maximum wall thickness of the upper chord member at the connection, and the difference between the diameter of the circular steel plate and the diameter of the opening cross section is 40 mm.

[0013] Specifically, a steel rib is provided inside the partial ball, and the steel rib is fixedly connected to the inner side surface of the partial ball and the lower side surface of the circular steel plate.

[0014] Optionally, the center of the partial sphere coincides with the center axis of the circular steel plate.

[0015] Optionally, gaps are provided between adjacent connection points between the web bars and the partial spheres.

[0016] Optionally, equal strength welding is adopted between the grid, the circular steel plate, the partial ball and the web.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] The utility model arranges a circular steel plate on the lower flange of the upper chord member of the grid frame, and further welds a partially hollow steel ball under the circular steel plate, and the partial steel ball is connected to the web of the grid frame. Through the combined use of the circular steel plate and the partial ball, the internal force at the node can be more effectively distributed and transmitted, thereby improving the stability and safety of the entire structure. At the same time, the design of the partial ball makes the connection with the web more uniform and reasonable, avoiding the stress concentration problem that may occur in traditional nodes.

[0019] Compared with traditional welded ball nodes or other complex node designs, the node structure of the utility model is simpler. At the same time, due to the simplification of the node structure, the difficulty of operation during construction is reduced, which is conducive to improving construction efficiency and speed. In addition, the degree of prefabrication of the node can be provided to facilitate the completion of most processing work in the factory, reducing the complexity and uncertainty of on-site construction.

[0020] The setting of the circular steel plate ensures that the surface of the upper chord member above the node is flat, which is very important for the subsequent laying of the concrete floor. The flat upper surface makes the construction of the concrete floor more convenient and reduces the extra work and material consumption required to deal with the uneven surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification and do not constitute a limitation on the embodiments of the present invention.

[0022] Figure 1 The utility model is a schematic diagram of the structure of a new type of node on the upper chord of a grid rectangular tube.

[0023] Figure 2 It is a bottom view of a new type of node on the upper chord of a grid rectangular tube according to the utility model.

[0024] Figure 3 It is a side view of a new type of node on the upper chord of a grid rectangular tube according to the utility model.

[0025] Figure numerals: 1-upper chord member, 2-circular steel plate, 3-partial ball, 4-web member, 5-strengthening rib, 6-steel rib plate. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific implementation methods described here are only used to explain the relevant content, rather than to limit the utility model.

[0027] It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings.

[0028] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, a new type of grid rectangular tube upper chord node is provided, including: the node is located on the lower side of the grid, and multiple webs 4 are connected to the grid through the node, the node includes: a circular steel plate 2 and a partial ball 3, the circular steel plate 2 is horizontally arranged, and the upper side of the circular steel plate 2 is fixedly connected to the lower side of the grid, the opening section of the partial ball 3 is fixedly connected to the lower side of the circular steel plate 2, and the upper ends of multiple webs 4 are respectively fixedly connected to the spherical surface of the partial ball 3. Equal strength welding is adopted between the grid, the circular steel plate 2, the partial ball 3, and the webs 4.

[0032] The utility model is aimed at a grid frame using rectangular tubes and paved with concrete floor slabs, and the overall structure includes three main features:

[0033] The connection structure of the upper chord member 1 of the grid, the connection structure of the grid and the partial ball 3, and the connection structure of the partial ball 3 and the web member 4.

[0034] The three link structures are described in detail.

[0035] (1) Upper chord connection structure of the grid:

[0036] The grid comprises a plurality of upper chord members 1, which are rectangular steel tubes. The lower flange heights of any two connected upper chord members 1 are the same, and the nodes are fixedly connected to the connection.

[0037] The connection points of the connected upper chord members 1 are set at the same height to facilitate the welding of the circular steel plates 2 and to make the force of the entire grid more balanced.

[0038] All the top levers have the same section height, different section widths and different wall thicknesses.

[0039] like Figure 2 As shown, when the upper chord members 1 are connected, the larger upper chord member 1 is set through, the smaller upper chord member 1 is cut off and welded to the larger upper chord member 1, and a reinforcing rib 5 is set in the larger upper chord member 1, and the reinforcing rib 5 and the side plate of the smaller upper chord member 1 are located in the same plane.

[0040] The upper chord member 1 is made of rectangular steel tube. All upper chord members 1 have the same cross-sectional height, but the cross-sectional width and the wall thickness can be different. The number of members is determined according to the structural scheme and is not limited to Figure 1 4 as shown. When multiple upper chords intersect, the larger member is penetrated, and the smaller member is interrupted and welded to the larger member. Stiffening ribs are set in the larger member corresponding to the web position of the smaller member. If the upper chord is set with a concrete floor, studs can be set.

[0041] (2) The connection structure between the grid and some of the balls 3.

[0042] The circular steel plate 2 is fixedly connected to the lower flange of the upper chord member 1 , and the central axis of the circular steel plate 2 coincides with the center of the connection. The diameter of the circular steel plate 2 is larger than the diameter of the opening section of the partial ball 3 .

[0043] Optionally, the thickness of the circular steel plate 2 is equal to the maximum wall thickness of the upper chord member 1 at the connection, and the difference between the diameter of the circular steel plate 2 and the opening section is 40 mm.

[0044] This circular steel plate 2 is also welded to the lower flange of the rectangular upper chord member 1. The center of the circular steel plate 2 is aligned with the intersection of the upper chord member 1. The thickness of the circular steel plate 2 is the same as the thickness of the thicker plate on the lower flange of the upper chord. The diameter of the circular steel plate 2 is determined by the diameter of the intersection circle between this plate and the lower connecting part sphere 3, which can be taken as the intersection circle diameter + 40mm.

[0045] A steel rib 6 is provided inside the partial sphere 3, and the steel rib 6 is fixedly connected to the inner side of the partial sphere 3 and the lower side of the circular steel plate 2. The center of the partial sphere 3 coincides with the central axis of the circular steel plate 2.

[0046] The diameter of the partial ball 3 can be determined according to the following two principles: a) its diameter should be such that the web members 4 (circular tubes) do not contact each other; b) its diameter and wall thickness should meet the requirements of the node strength calculation.

[0047] The partial ball 3 can be obtained by cutting the complete ball through welding. Depending on the ball diameter and calculation requirements, a straight or cross-shaped stiffening rib can be set in the partial ball 3. If the force is large, a steel rib plate 6 can be set between the partial steel ball and the circular steel plate 2.

[0048] (3) Connection structure between the partial ball 3 and the web 4:

[0049] Gaps are provided between the connection points of adjacent web members 4 and partial spheres 3. The web members 4 are welded and connected to the partial spheres 3. Depending on the calculation requirements of the node strength, structures such as reinforcing plates or connecting plates may be provided.

[0050] A detailed description of the working principle:

[0051] The basic structure of the node includes a circular steel plate 2 and a partial ball 3. The circular steel plate 2 is fixed to the lower flange of the upper chord member 1 of the grid frame, serving as a basic platform for connecting the upper chord member 1 and the web member 4. The partial ball 3 is fixed below the circular steel plate 2, providing an interface for connecting with multiple web members 4.

[0052] When the grid or truss bears load, the upper chord member 1, as the main load-bearing member, bears the load first. By arranging the circular steel plate 2 under the upper chord member 1, the force borne by the upper chord member 1 can be evenly transferred to the partial sphere 3. Due to its geometric shape, the partial sphere 3 can effectively and evenly distribute the force to the multiple web members 4 connected thereto, thereby achieving effective transmission and distribution of force.

[0053] Through the above force transmission mechanism, the entire structure can effectively disperse the load, reduce local stress concentration, and increase the overall stability and safety of the structure. In particular, the connection design of the partial ball 3 and the web 4 ensures the mechanical properties of the node area, enables the structure to adapt to loads in different directions, and enhances the structure's ability to resist deformation.

[0054] The node design uses standardized circular steel plates 2 and partial spheres 3. These components can be prefabricated in the factory and can be quickly assembled on site by welding, which greatly improves construction efficiency. At the same time, the simplified node design also helps to reduce the use of materials and reduce the cost of the entire structure.

[0055] The upper surface of the circular steel plate 2 forms a flat connection surface with the lower flange of the upper chord member 1 of the grid, providing a good foundation for laying the concrete floor. This design simplifies the flatness adjustment work in the subsequent concrete floor construction process, ensures the construction quality, and reduces the construction cost.

[0056] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above utility model, and these changes or modifications are still within the scope of the present utility model.

Claims

1. A new type of node for upper chord of grid rectangular tube, characterized in that: include: The node is located on the lower side of the grid, and a plurality of webs (4) are connected to the grid via the node. The node comprises: a circular steel plate (2) and a partial ball (3). The circular steel plate (2) is arranged horizontally, and the upper side of the circular steel plate (2) is fixedly connected to the lower side of the grid. The opening section of the partial ball (3) is fixedly connected to the lower side of the circular steel plate (2), and the upper ends of the plurality of webs (4) are respectively fixedly connected to the spherical surface of the partial ball (3).

2. A new type of grid rectangular tube upper chord node according to claim 1, characterized in that: The grid comprises a plurality of upper chord members (1), wherein the upper chord members (1) are rectangular steel tubes, and the lower flange heights of any two connected upper chord members (1) are the same at the connection point, and the node is fixedly connected to the connection point.

3. A new type of grid rectangular tube upper chord node according to claim 2, characterized in that: All chord levers have the same section height, the same or different section widths, and the same or different wall thicknesses.

4. A new type of upper chord node of a grid rectangular tube according to claim 3, characterized in that: When the upper chord members (1) are connected, the upper chord member (1) with a larger size is arranged through, the upper chord member (1) with a smaller size is cut and then welded to the upper chord member (1) with a larger size, and a reinforcing rib (5) is arranged inside the upper chord member (1) with a larger size, and the reinforcing rib (5) and the side plate of the upper chord member (1) with a smaller size are located in the same plane.

5. A new type of upper chord node of a grid rectangular tube according to claim 2, characterized in that: The circular steel plate (2) is fixedly connected to the lower flange of the upper chord member (1), and the central axis of the circular steel plate (2) coincides with the center of the connection, and the diameter of the circular steel plate (2) is greater than the diameter of the opening cross section of the partial ball (3).

6. A new type of upper chord node of a grid rectangular tube according to claim 5, characterized in that: The thickness of the circular steel plate (2) is equal to the maximum wall thickness of the upper chord member (1) at the connection, and the difference between the diameter of the circular steel plate (2) and the diameter of the opening section is 40 mm.

7. A new type of grid rectangular tube upper chord node according to claim 1, characterized in that: A steel rib plate (6) is arranged inside the partial ball (3), and the steel rib plate (6) is fixedly connected to the inner side surface of the partial ball (3) and the lower side surface of the circular steel plate (2).

8. A new type of upper chord node of a grid rectangular tube according to claim 7, characterized in that: The center of the partial sphere (3) coincides with the center axis of the circular steel plate (2).

9. A new type of grid rectangular tube upper chord node according to claim 1, characterized in that: Gaps are provided between the connection points of adjacent web bars (4) and the partial balls (3).

10. A new type of grid rectangular tube upper chord node according to claim 1, characterized in that: The grid, the circular steel plate (2), the partial ball (3) and the web (4) are all welded with equal strength.

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