Large-angle forked cast steel joint

Abstract

The utility model belongs to the field of building steel structures, and provides a large-angle forked cast steel joint which comprises three circular-truncated-cone-shaped steel pipe branches, a circular steel pipe main pipe and a Y-shaped steel plate. The three circular-truncated-cone-shaped steel pipe branches and the circular steel pipe main branch are connected through hemispherical steel plates; the Y-shaped steel plate separates the three circular-truncated-cone-shaped steel pipe branches, and three cavities are formed in the circular steel pipe main pipe and the hemispherical steel plate. The three circular-truncated-cone-shaped steel pipe branches, the circular steel pipe main pipe, the hemispherical steel plate and the Y-shaped steel plate are integrally formed. The steel joint has the following advantages that the steel joint is integrally formed, welding is not needed, and the problem of residual stress generated by intersecting welding seams is avoided; the size of the end of the joint is enlarged, the supporting steel plate is additionally arranged inside, strength is improved, stability is high, and local instability of the end caused by the too large branch angle of the steel pipe is avoided. The surface of the joint is smooth and does not need to be specially treated, and the attractiveness of the joint is guaranteed; the node is good in integrity, safe, reliable and convenient to construct.

Description

Technical Field

[0001] The utility model belongs to the field of building steel structures, and particularly relates to a large-angle bifurcated cast steel joint. Background Technique

[0002] For large-angle bifurcated members, it is difficult to ensure the safety and reliability of the joint by using traditional steel structure joints. Usually, it requires on-site welding by workers, with high requirements for installation construction technology, difficult operation, low production efficiency, non-smooth surface treatment, and poor appearance quality.

[0003] Due to its properties such as easy processing and complex and diverse building shapes, cast steel joints are currently widely used in some large-span space steel structures. Especially in dealing with complex intersection joints, cast steel joints have unique advantages, and the force of cast steel joints is clear and the bearing capacity is large. However, the existing cast steel joints have weak end strength and poor stability. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the utility model provides a large-angle bifurcated cast steel joint, which has a firm structure, clear force, and smooth surface.

[0005] To achieve the above object, the utility model adopts the following technical scheme: A large-angle bifurcated cast steel joint includes branch a, branch b, branch c, main pipe, hemispherical plate, and Y-shaped plate;

[0006] The branch a, branch b, and branch c are all frustum-shaped structures. The branch a, branch b, and branch c are all spherically connected to the hemispherical plate, and the main pipe is connected to the hemispherical plate with the openings aligned;

[0007] An inter-limb chamfer a is provided between the branch a and the hemispherical plate, an inter-limb chamfer b is provided between the branch b and the hemispherical plate, and an inter-limb chamfer c is provided between the branch c and the hemispherical plate;

[0008] The Y-shaped plate divides the interior of the main pipe and the hemispherical plate into three cavities, and the three plates of the Y-shaped plate respectively divide the branch a and branch b, the branch a and branch c, and the branch b and branch c;

[0009] The branch a, branch b, branch c, main pipe, hemispherical plate, inter-limb chamfer a, inter-limb chamfer b, inter-limb chamfer c, and Y-shaped plate are integrally formed.

[0010] Further, the included angle between the axis of the branch a and the axis of the branch b is 80° - 100°, the included angle between the axis of the branch a and the axis of the branch c is 80° - 100°, and the included angle between the axis of the branch c and the axis of the branch b is 55° - 80°.

[0011] Furthermore, the branch members a, b, and c are all frustum-shaped steel pipes.

[0012] Furthermore, the outer side slopes (height-width ratios) of the branch members a, b, and c are all (20 - 25):1.

[0013] Furthermore, the chamfers a, b, and c between the members are all concave arc chamfers.

[0014] Furthermore, the chamfer radii of the chamfers a, b, and c between the members are all 100 mm - 150 mm.

[0015] Furthermore, the height of the main pipe is 500 mm - 800 mm.

[0016] Furthermore, the Y-shaped plate is composed of three steel plates, and one ends of the three steel plates intersect at a straight line.

[0017] Furthermore, the top of the Y-shaped plate is connected to the hemispherical plate, and the bottom of the Y-shaped plate is flush with the bottom of the main pipe.

[0018] Furthermore, the branch members a, b, c, the main pipe, the hemispherical plate, the chamfers a, b, c between the members, and the Y-shaped plate are all made of one of ZG230 - 450H steel, ZG270 - 480H steel, ZG300 - 500H steel, and ZG340 - 550H steel.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] 1. The three branch members and the main pipe are integrally formed without welding, avoiding the problem of residual stress caused by the intersecting welds; 2. The end size of the joint is enlarged, and a Y-shaped plate is added inside as a support plate, increasing the strength and stability, and avoiding local buckling at the end caused by too large an angle of the steel pipe branch members; 3. The surface of the joint is smooth, and no special treatment of the surface is required, ensuring the aesthetics of the joint; 4. The joint has good integrity, is safe and reliable, and is convenient for construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structural schematic diagram of a large-angle bifurcated cast steel joint provided by an embodiment of the present utility model;

[0022] Figure 2 is a sectional structural schematic diagram of a large-angle bifurcated cast steel joint provided by an embodiment of the present utility model;

[0023] Figure 3 is Figure 2 the sectional structural schematic diagram at AA in

[0024] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0025] 1. Branch a; 2. Branch b; 3. Branch c; 4. Main pipe; 5. Hemispherical plate; 6. Chamfer a between branches; 7. Chamfer b between branches; 8. Chamfer c between branches; 9. Y-shaped plate. Detailed implementation manners

[0026] To facilitate the understanding of this application, the following will provide a more comprehensive description of this application with reference to the relevant accompanying drawings. Embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of this application more thorough and comprehensive.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0028] It can be understood that spatial relationship terms such as "under", "below", "lower", "beneath", "above", "upper", etc. can be used herein to describe the relationship between one element or feature shown in the drawings and other elements or features. It should be understood that in addition to the orientation shown in the drawings, spatial relationship terms also include different orientations of the devices during use and operation. For example, if the device in the drawing is flipped, the element or feature described as "under other elements" or "beneath it" or "under it" will be oriented "above" other elements or features. Therefore, the exemplary terms "under" and "below" can include both the upper and lower orientations. In addition, the device can also include other orientations (such as rotating 90 degrees or other orientations), and the spatial descriptive terms used herein are accordingly interpreted.

[0029] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection" should be understood as "electrical connection", "communication connection", etc. if there is an electrical signal or data transfer between the connected circuits, modules, units, etc.

[0030] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / include" or "has" and the like specify the presence of the stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0031] As Figures 1-3 shown, a large-angle bifurcated cast steel joint includes branch a1, branch b2, branch c3, main pipe 4, hemispherical plate 5, and Y-shaped plate 9.

[0032] The hemispherical plate 5 is a hemispherical steel plate. The branch a1, branch b2, and branch c3 are connected to the main pipe 4 by using the hemispherical plate 5. Specifically, the branch a1, branch b2, and branch c3 are all connected to the spherical surface of the hemispherical plate 5. The main pipe 4 is a circular steel pipe, and the main pipe 4 is adapted to the hemispherical plate 5 so that the bottom opening of the main pipe 4 is aligned with the bottom opening of the hemispherical plate 5. The height of the main pipe 4 is 500 mm to 800 mm.

[0033] The branch a1, branch b2, and branch c3 are all frustum-shaped steel pipes. When the branch a1, branch b2, and branch c3 are all gradually approaching the hemispherical plate 5, the outer diameter gradually increases, and the slope of the outer side surface (height-width ratio) is (20 - 25):1. The included angle between the axis of the branch a1 and the axis of the branch b2 is 80° to 100°, the included angle between the axis of the branch a1 and the axis of the branch c3 is 80° to 100°, and the included angle between the axis of the branch c3 and the axis of the branch b2 is 55° to 80°.

[0034] An inter-member chamfer a6 is provided between the branch a1 and the hemispherical plate 5, an inter-member chamfer b7 is provided between the branch b2 and the hemispherical plate 5, and an inter-member chamfer c8 is provided between the branch c3 and the hemispherical plate 5. The inter-member chamfer a6, inter-member chamfer b7, and inter-member chamfer c8 are all arc concave chamfers. The chamfer radii of the inter-member chamfer a6, inter-member chamfer b7, and inter-member chamfer c8 are all 100 mm to 150 mm.

[0035] The top of the Y-shaped plate 9 is connected to the inner wall of the hemispherical plate 5, the bottom of the Y-shaped plate 9 is flush with the bottom of the main pipe 4, and an integral space is formed inside after the main pipe 4 and the hemispherical plate 5 are connected. The Y-shaped plate 9 divides this integral space into three cavities.

[0036] The Y-shaped plate 9 is composed of three steel plates. One ends of the three steel plates intersect at a straight line, and the other ends of the three steel plates are all connected to the inner walls of the main pipe 4 and the hemispherical plate 5 at the same time.

[0037] The three steel plates of the Y-shaped plate 9 separate the branch a1 and the branch b2, the branch a1 and the branch c3, and the branch b2 and the branch c3 respectively. Specifically, among the three steel plates of the Y-shaped plate 9, the first steel plate separates the branch a1 and the branch b2, that is, the first steel plate is located between the branch a1 and the branch b2; the second steel plate separates the branch a1 and the branch c3, that is, the second steel plate is located between the branch a1 and the branch c3; the third steel plate separates the branch b2 and the branch c3, that is, the third steel plate is located between the branch b2 and the branch c3 (it can be understood that the branch a1, the branch b2, and the branch c3 are respectively in contact with the three cavities).

[0038] The branch a1, the branch b2, the branch c3, the main pipe 4, the hemispherical plate 5, the chamfer a6 between the limbs, the chamfer b7 between the limbs, the chamfer c8 between the limbs, and the Y-shaped plate 9 are integrally cast by a precast template.

[0039] The branch a1, the branch b2, the branch c3, the main pipe 4, the hemispherical plate 5, the chamfer a6 between the limbs, the chamfer b7 between the limbs, the chamfer c8 between the limbs, and the Y-shaped plate 9 are all made of one of ZG230-450H steel, ZG270-480H steel, ZG300-500H steel, and ZG340-550H steel.

[0040] In summary, for the large-angle bifurcated cast steel joint provided in this embodiment, the three branches are integrally formed with the main pipe 4, without welding, avoiding the residual stress problem caused by the intersecting welds; the end size of the joint is enlarged (the outer diameter of the branches gradually increases near the hemispherical plate), and the Y-shaped plate 9 is added as a support plate inside the main pipe 4 and the hemispherical plate 5, increasing the strength and stability, and avoiding local buckling at the end caused by too large an angle of the steel pipe branches; the surface of the joint is smooth, without special treatment on the surface, ensuring the aesthetics of the joint; the joint has good integrity, is safe and reliable, and is convenient for construction.

[0041] The specific embodiments are as follows:

[0042] A large-angle three-bifurcated cast steel joint.

[0043] Among them, the outer diameters of the upper ends of the branch a1, the branch b2, and the branch c3 are all 500 mm, the outer diameters of the lower ends are all 550 mm, the wall thickness is 30 mm, and the height is 600 mm; the included angle between the axis of the branch a1 and the axis of the branch b2 is 98°, the included angle between the axis of the branch a1 and the axis of the branch c3 is 80°, and the included angle between the axis of the branch c3 and the axis of the branch b2 is 57°.

[0044] The branch a1, branch b2, branch c3 and the main pipe 4 are connected by a hemispherical plate 5; the outer diameters of both the hemispherical plate 5 and the main pipe 4 are 1200 mm, the wall thickness is 50 mm, and the height of the main pipe 4 is 500 mm.

[0045] An inter-member chamfer a6 with a chamfer radius of 100 mm is provided between the branch a1 and the hemispherical plate 5, an inter-member chamfer b7 with a chamfer radius of 100 mm is provided between the branch b2 and the hemispherical plate 5, and an inter-member chamfer c8 with a chamfer radius of 100 mm is provided between the branch c3 and the hemispherical plate 5.

[0046] The Y-shaped plate 9 is composed of three steel plates with a thickness of 30 mm. The length of the steel plate between the branch a1 and the branch b2 is 610 mm, the length of the steel plate between the branch b2 and the branch c3 is 560 mm, and the length of the steel plate between the branch a1 and the branch c3 is 450 mm.

[0047] The Y-shaped plate 9 divides the interior of the main pipe 4 and the hemispherical plate 5 into three cavities. The included angle between two adjacent steel plates in the cavity corresponding to the branch a1 is 135°, the included angle between two adjacent steel plates in the cavity corresponding to the branch b2 is 122°, and the included angle between two adjacent steel plates in the cavity corresponding to the branch c3 is 103°. The three branches, one main pipe, the hemispherical plate and the internal Y-shaped plate are integrally formed by casting together once with a precast template.

[0048] The branch a1, branch b2, branch c3, main pipe 4, hemispherical plate 5, inter-member chamfer a6, inter-member chamfer b7, inter-member chamfer c8 and Y-shaped plate 9 are all made of weldable ZG340-550H steel.

[0049] In the present utility model, the mechanisms, components and parts for which no specific structure is described are all existing structures that already exist in the prior art and can be directly purchased on the market.

[0050] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, "first" and "second" are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0051] The above are only the preferred embodiments of the present utility model and are not intended to limit the protection scope of the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A large-angle bifurcated cast steel node, characterized in that: It comprises a limb a (1), a limb b (2), a limb c (3), a main tube (4), a hemispherical plate (5), and a Y-shaped plate (9); The limbs a (1), b (2), and c (3) are all truncated cone structures, and the limbs a (1), b (2), and c (3) are all spherically connected to the hemispherical plate (5), and the main pipe (4) is connected to the opening of the hemispherical plate (5) in an aligned manner; An inter-limb chamfer a (6) is provided between the limb a (1) and the hemispherical plate (5), an inter-limb chamfer b (7) is provided between the limb b (2) and the hemispherical plate (5), and an inter-limb chamfer c (8) is provided between the limb c (3) and the hemispherical plate (5); The Y-shaped plate (9) divides the interior of the main pipe (4) and the hemispherical plate (5) into three cavities, and the three plates of the Y-shaped plate (9) respectively separate the limb a (1) and the limb b (2), the limb a (1) and the limb c (3), and the limb b (2) and the limb c (3); The limb a (1), limb b (2), limb c (3), main tube (4), hemispherical plate (5), interlimb chamfer a (6), interlimb chamfer b (7), interlimb chamfer c (8), and Y-shaped plate (9) are integrally formed.

2. A large-angle bifurcated cast steel node according to claim 1, characterized in that: The included angle between the axis of limb a (1) and the axis of limb b (2) is 80° to 100°, the included angle between the axis of limb a (1) and the axis of limb c (3) is 80° to 100°, and the included angle between the axis of limb c (3) and the axis of limb b (2) is 55° to 80°.

3. A large-angle bifurcated cast steel node according to claim 1, characterized in that: The limb a (1), limb b (2), and limb c (3) are all truncated cone-shaped steel pipes.

4. A large-angle bifurcated cast steel node according to claim 1, characterized in that: The slopes of the outer sides of limb a (1), limb b (2), and limb c (3) are all (20-25):

1.

5. A large-angle bifurcated cast steel node according to claim 1, characterized in that: The inter-limb chamfer a (6), inter-limb chamfer b (7), and inter-limb chamfer c (8) are all circular arc concave chamfers.

6. A large-angle bifurcated cast steel node according to claim 1, characterized in that: The chamfer radii of the inter-limb chamfer a (6), the inter-limb chamfer b (7), and the inter-limb chamfer c (8) are all 100 mm to 150 mm.

7. A large-angle bifurcated cast steel node according to claim 1, characterized in that: The height of the main pipe (4) is 500 mm to 800 mm.

8. A large-angle bifurcated cast steel node according to claim 1, characterized in that: The Y-shaped plate (9) is composed of three steel plates, and one end of the three steel plates intersects in a straight line.

9. A large-angle bifurcated cast steel node according to claim 1, characterized in that: The top of the Y-shaped plate (9) is connected to the hemispherical plate (5), and the bottom of the Y-shaped plate (9) is flush with the bottom of the main pipe (4).

10. A large-angle bifurcated cast steel node according to claim 1, characterized in that: The limb a (1), limb b (2), limb c (3), main pipe (4), hemispherical plate (5), interlimb chamfer a (6), interlimb chamfer b (7), interlimb chamfer c (8), and Y-shaped plate (9) are all made of one of ZG230-450H steel, ZG270-480H steel, ZG300-500H steel, and ZG340-550H steel.

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