Steel pipe pole member butt joint node and bearing capacity calculation method

Abstract

This application discloses a method for calculating the bearing capacity of a steel pipe member joint in the field of steel pipe structure technology. The joint includes a first steel pipe member, a second steel pipe member, a first stiffening plate, and a second stiffening plate. The first steel pipe member has multiple first node plates at its joint end, and the second steel pipe member has multiple second node plates at its joint end, with each node plate corresponding to the previous one. Vertical connecting plates are provided on both sides of the corresponding first and second node plates, and are fixedly connected to the first and second node plates by threaded fasteners. The first stiffening plate is connected to the outer wall of the first steel pipe member and the upper end of the first node plate, respectively, and the second stiffening plate is connected to the outer wall of the second steel pipe member and the lower end of the second node plate, respectively. This application improves the stability and reliability of steel pipe member joints, allows for flexible adjustments according to actual engineering needs, and proposes a method for calculating the bearing capacity of the steel pipe member joint.

Description

Technical Field

[0001] This application belongs to the field of steel pipe structure technology, and in particular relates to a method for calculating the bearing capacity of steel pipe member joints. Background Technology

[0002] With the planning and construction of ultra-high voltage (UHV) transmission lines and the application of multi-circuit technology on the same tower, the external load on transmission towers has increased exponentially, leading to a trend towards larger tower structures. Steel pipe towers, with their simple structural form, high overall rigidity, and good load-bearing capacity, are suitable for use in towers with heavy loads. Promoting the use of steel pipe towers in high-load towers can effectively reduce tower weight, decrease tower root spacing, shorten transmission line corridors, and reduce demolition and vegetation damage. Steel pipe components are widely used in industries such as power, metallurgy, petroleum, chemical, and telecommunications, especially in the broadcasting system.

[0003] From international design experience, developed countries mostly use steel pipe tower structures for high-load transmission towers. Since the 1990s, Japan has been using steel pipe tower structures in high-voltage and ultra-high-voltage projects, employing this structural system in all 1000kV ultra-high-voltage lines and transmission towers, and has conducted experimental research and theoretical analysis on the application of steel pipe towers in engineering. South Korea has also extensively used steel pipe towers in its 750kV transmission lines. The application of steel pipe towers in my country's transmission towers started relatively late. Domestically, steel pipe tower structures are mostly used in long-span, 500kV double-circuit transmission towers, and some substation structures. All 1000kV double-circuit ultra-high-voltage transmission lines use steel pipe tower structures.

[0004] Flange nodes are typically used for connecting the main components of power transmission steel pipe towers. A typical bolt-flange connection consists of bolt assemblies, flanges, and gaskets. Rigid flanges offer good connection stiffness and load-bearing capacity, but require extensive welding work, with stiffening ribs typically welded manually, resulting in significant residual stress at the joints. Flexible flanges have lower connection stiffness and greater surface deformation, and are generally used for less important member nodes. Forged neck flanges have connecting steel pipes with necked welding flanges that have essentially the same neck diameter and wall thickness, connected via butt welds. The neck flange features a straight neck section and a variable slope section, which improves the stress distribution and structural rationality of the flange, enhancing the load-bearing performance and connection stiffness of unstiffened flanges. With proper design, the connection stiffness of neck flanges falls between that of unstiffened and stiffened flanges. Summary of the Invention

[0005] The purpose of this application is to provide a method for calculating the bearing capacity of steel pipe member joints, thereby improving the connection performance and bearing capacity of steel pipe joints and effectively enhancing the safety and reliability of steel pipe member connection joints.

[0006] To achieve the above objectives, this application employs the following technical solution:

[0007] In a first aspect, this application provides a steel pipe member connection node, including a first steel pipe member, a second steel pipe member, a first stiffening plate, and a second stiffening plate;

[0008] The first steel pipe member has multiple first node plates at its connecting end, and the second steel pipe member has multiple second node plates at its connecting end, with the first node plates and the second node plates being set in a one-to-one correspondence.

[0009] Vertical connecting plates are provided on both sides of the corresponding first node plate and second node plate, and are fixedly connected to the first node plate and second node plate by threaded fasteners to realize the docking of the first steel pipe member and the second steel pipe member;

[0010] The first stiffening plate is connected to the outer wall of the first steel pipe member and the upper end of the first node plate, respectively, and the second stiffening plate is connected to the outer wall of the second steel pipe member and the lower end of the second node plate, respectively.

[0011] Furthermore, the first steel pipe member and the second steel pipe member are coaxially arranged.

[0012] Furthermore, the first node plate is evenly distributed along the circumference of the first steel pipe member, and the second node plate is evenly distributed along the circumference of the second steel pipe member.

[0013] Furthermore, the vertical connecting plate spans the first node plate and the second node plate, and is simultaneously attached to both the first node plate and the second node plate.

[0014] Furthermore, the upper part of the vertical connecting plate is fixedly connected to the first node plate by at least one threaded fastener, and the lower part of the vertical connecting plate is fixedly connected to the second node plate by at least one threaded fastener.

[0015] Furthermore, the threaded fastener is a bolt.

[0016] Furthermore, the first node plate is welded to the outer wall of the mating end of the first steel pipe member, and the second node plate is welded to the outer wall of the mating end of the second steel pipe member.

[0017] Furthermore, the first stiffening plate is sleeved on the outer wall of the first steel pipe member and connected to the first steel pipe member through a circumferential weld. The first stiffening plate is welded to the upper end of the first node plate.

[0018] The second stiffening plate is sleeved on the outer wall of the second steel pipe member and connected to the second steel pipe member through a circumferential weld. The second stiffening plate is welded to the lower end of the second node plate.

[0019] Secondly, this application provides a method for calculating the bearing capacity of a steel pipe member butt joint, used for the steel pipe member butt joint described in the first aspect, comprising:

[0020] Obtain the number of gusset plates at the joint ends of steel pipe members. The tensile force borne by the steel pipe member By number of node boards The tensile force is distributed evenly to obtain the corresponding section of each node plate. :

[0021]

[0022] Based on the tensile force borne by the corresponding section of each node plate The distance from the centerline of the threaded fastener to the outer wall of the steel pipe member Calculate the radial bending moment of the corresponding section for each node plate. :

[0023]

[0024] Based on the radial bending moment of the corresponding section of each node plate Calculate the vertical spacing e2 between the threaded fasteners. Directional shear force :

[0025]

[0026] Threaded fasteners Directional shear force :

[0027]

[0028] According to threaded fasteners Directional shear force and threaded fasteners Directional shear force Calculate the resultant force V of the threaded fastener:

[0029] .

[0030] Compared with the prior art, the beneficial effects achieved by this application are as follows:

[0031] 1. The steel pipe member butt joint provided in this application achieves the butt joint of steel pipe members by setting node plates, stiffening plates and vertical node plates on the outer wall of the butt joint end of the steel pipe members, which effectively improves the convenience of steel pipe member connection, and at the same time effectively reduces the spatial size and weight of the joint;

[0032] 2. This application also provides a method for calculating the bearing capacity of steel pipe member butt joints. By considering the influence of shear force and bending moment on threaded fasteners, the bearing capacity of the joint can be calculated more accurately, providing a more reliable theoretical basis for actual engineering design. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the unconnected joint of the steel pipe member provided in the embodiments of this application;

[0034] Figure 2 This is a schematic diagram of the connection of the steel pipe member connection node provided in the embodiments of this application;

[0035] Figure 3 yes Figure 2 Section 1-1 in the diagram;

[0036] Figure 4 yes Figure 2 Section 2-2 in the middle;

[0037] Figure 5 This is a force diagram of the steel pipe member connection node provided in the embodiments of this application.

[0038] In the figure: 1. First steel pipe member; 2. Second steel pipe member; 3. First node plate; 4. Second node plate; 5. First stiffening plate; 6. Second stiffening plate; 7. First node plate bolt; 8. Second node plate bolt; 9. Vertical connecting plate. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. Example 1

[0040] This embodiment provides a steel pipe member butt joint node for on-site splicing of circular pipe columns or other steel pipe members in steel structure engineering. (Reference) Figures 1 to 4 The docking node includes a first steel pipe member 1, a second steel pipe member 2, a first node plate 3, a second node plate 4, a vertical connecting plate 9, a first stiffening plate 5, and a second stiffening plate 6. Among them, as shown... Figure 1 The image shown is a schematic diagram of the unconnected joint of the steel pipe members provided in the embodiments of this application. For example... Figure 2 The diagram shown is a schematic diagram of the connection of the steel pipe member connection node provided in the embodiment of this application.

[0041] In a specific embodiment of this application, the first steel pipe member 1 and the second steel pipe member 2 to be connected are circular tube column structures. Multiple first node plates 3 are provided at the connecting end of the first steel pipe member 1, and multiple second node plates 4 are provided at the connecting end of the second steel pipe member 2, with each node plate 3 corresponding to the previous one. The first node plates 3 are evenly distributed along the circumference of the first steel pipe member 1, and the second node plates 4 are evenly distributed along the circumference of the second steel pipe member 2. The first steel pipe member 1 and the second steel pipe member 2 are coaxially arranged.

[0042] Furthermore, the first node plate 3 is welded to the outer wall of the mating end of the first steel pipe member 1, and the second node plate 4 is welded to the outer wall of the mating end of the second steel pipe member 2.

[0043] In this embodiment, to achieve the docking of the first steel pipe member 1 and the second steel pipe member 2, vertical connecting plates 9 are provided on both sides of the corresponding first node plate 3 and second node plate 4. The vertical connecting plates 9 span the first node plate 3 and the second node plate 4, and are simultaneously in contact with the first node plate 3 and the second node plate 4. Multiple connecting holes are correspondingly provided on the plates of the first node plate 3, the second node plate 4, and the vertical connecting plates 9. The upper region of the vertical connecting plate 9 is fixedly connected to the first node plate 3 by at least one threaded fastener, and the lower region of the vertical connecting plate 9 is fixedly connected to the second node plate 4 by at least one threaded fastener.

[0044] As a preferred embodiment, the threaded fasteners in this embodiment are bolts. Specifically, the upper part of the vertical connecting plate 9 is fixed to the first node plate 3 using the first node plate bolt 7, and the lower part of the vertical connecting plate 9 is fixed to the second node plate 4 using the second node plate bolt 8, thereby completing the reliable connection of the two steel pipe members.

[0045] In this embodiment, to ensure a more stable connection between the first steel pipe member 1 and the second steel pipe member 2, a first stiffening plate 5 and a second stiffening plate 6 are also provided. The first stiffening plate 5 is fitted onto the outer wall of the first steel pipe member 1 and fixedly connected to it via a circumferential weld, and is also welded to the upper end of the first node plate 3. The second stiffening plate 6 is fitted onto the outer wall of the second steel pipe member 2 and connected to it via a circumferential weld, and is also welded to the lower end of the second node plate 4. Example 2

[0046] This embodiment provides a steel pipe member butt joint, the fabrication steps of which are as follows:

[0047] The factory has completed the production of various steel components for the steel pipe member docking node, including the first steel pipe member 1, the second steel pipe member 2, the first node plate 3, the second node plate 4, the first stiffening plate 5, the second stiffening plate 6, the first node plate bolt 7, the second node plate bolt 8, and the vertical connecting plate 9.

[0048] The factory completed the welding of the first steel pipe member 1 and the first node plate 3.

[0049] The factory completed the welding of the second steel pipe member 2 and the second node plate 4.

[0050] The factory completed the welding of the first stiffening plate 5, the first steel pipe member 1, and the first node plate 3.

[0051] The factory completed the welding of the second stiffening plate 6, the second steel pipe member 2, and the second node plate 4.

[0052] The factory has completed the trial assembly of the nodes.

[0053] After the steel components of the steel pipe member connection node are transported to the construction site, they are assembled in sections.

[0054] The first steel pipe member 1 and the second steel pipe member 2 were spatially connected on site, so that the first node plate 3 and the second node plate 4 were spatially aligned.

[0055] The first node plate 3, the second node plate 4, and the vertical connecting plate 9 were spliced ​​on site.

[0056] The installation of bolts 7 on the first node plate and bolts 8 on the second node plate was completed on site, and the connecting bolts were tightened to the specified torque value using a torque wrench. Example 3

[0057] This embodiment, based on Embodiment 1, uses bolts as the threaded fastener. See also... Figure 5 As shown in the stress diagram, this embodiment provides a method for calculating the bearing capacity of a steel pipe member butt joint, including the following steps:

[0058] Step 1: Obtain the number of gusset plates at the joint ends of the steel pipe members. The tensile force borne by the steel pipe member By number of node boards The tensile force is distributed evenly to obtain the corresponding section of each node plate. :

[0059]

[0060] Step 2: Based on the tensile force borne by the corresponding section of each node plate The distance from the center line of the bolt to the outer wall of the steel pipe member Calculate the radial bending moment of the corresponding section for each node plate. :

[0061]

[0062] Step 3: Based on the radial bending moment of the corresponding section of each node plate Calculate the bolt vertical spacing e2. Directional shear force :

[0063]

[0064] bolt Directional shear force :

[0065]

[0066] Step 4: According to the bolts Directional shear force and bolts Directional shear force Calculate the resultant force V of the bolts:

[0067] .

[0068] In the description of this application, it should be understood that the terms "upper," "lower," "bottom," "top," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement of the components in a specific orientation. If the specific orientation changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this application and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this application.

[0069] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0070] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will be able to understand the specific meaning of the above terms in this application based on the specific circumstances.

[0071] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A steel pipe member butt joint, characterized in that, It includes a first steel pipe member, a second steel pipe member, a first stiffening plate, and a second stiffening plate; The first steel pipe member has multiple first node plates at its connecting end, and the second steel pipe member has multiple second node plates at its connecting end, with the first node plates and the second node plates being set in a one-to-one correspondence. Vertical connecting plates are provided on both sides of the corresponding first node plate and second node plate, and are fixedly connected to the first node plate and second node plate by threaded fasteners to realize the docking of the first steel pipe member and the second steel pipe member; The first stiffening plate is connected to the outer wall of the first steel pipe member and the upper end of the first node plate, respectively, and the second stiffening plate is connected to the outer wall of the second steel pipe member and the lower end of the second node plate, respectively.

2. The steel pipe member butt joint according to claim 1, characterized in that, The first steel pipe member and the second steel pipe member are coaxially arranged.

3. The steel pipe member butt joint according to claim 2, characterized in that, The first node plate is evenly distributed along the circumference of the first steel pipe member, and the second node plate is evenly distributed along the circumference of the second steel pipe member.

4. The steel pipe member butt joint according to claim 1, characterized in that, The vertical connecting plate spans the first node plate and the second node plate, and is simultaneously attached to both the first node plate and the second node plate.

5. The steel pipe member butt joint according to claim 4, characterized in that, The upper part of the vertical connecting plate is fixedly connected to the first node plate by at least one threaded fastener, and the lower part of the vertical connecting plate is fixedly connected to the second node plate by at least one threaded fastener.

6. The steel pipe member butt joint according to claim 5, characterized in that, The threaded fastener is a bolt.

7. The steel pipe member butt joint according to claim 1, characterized in that, The first node plate is welded to the outer wall of the joint end of the first steel pipe member, and the second node plate is welded to the outer wall of the joint end of the second steel pipe member.

8. The steel pipe member butt joint according to claim 1, characterized in that, The first stiffening plate is sleeved on the outer wall of the first steel pipe member and connected to the first steel pipe member through a circumferential weld. The first stiffening plate is welded to the upper end of the first node plate. The second stiffening plate is sleeved on the outer wall of the second steel pipe member and connected to the second steel pipe member through a circumferential weld. The second stiffening plate is welded to the lower end of the second node plate.

9. A method for calculating the bearing capacity of a butt joint of steel pipe members, characterized in that, For the steel pipe member butt joint as described in any one of claims 1 to 8, comprising: Obtain the number of gusset plates at the joint ends of steel pipe members. The tensile force borne by the steel pipe member By number of node boards The tensile force is distributed evenly to obtain the corresponding section of each node plate. : Based on the tensile force borne by the corresponding section of each node plate The distance from the centerline of the threaded fastener to the outer wall of the steel pipe member Calculate the radial bending moment of the corresponding section for each node plate. : Based on the radial bending moment of the corresponding section of each node plate Calculate the vertical spacing e2 between the threaded fasteners. Directional shear force : Threaded fasteners Directional shear force : According to threaded fasteners Directional shear force and threaded fasteners Directional shear force Calculate the resultant force V of the threaded fastener: 。

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