CN-121976617-A - Large-span heavy-load steel structure mid-span support node structure and method thereof

Abstract

The invention discloses a large-span heavy-load steel structure mid-span support node structure and a method thereof, wherein the structure comprises a cylinder, a hemispherical shell and a chord member; the inner ring of the cylinder is fixedly provided with a plurality of layers of annular stiffening plates along the height direction, the outer ring of the cylinder is fixedly provided with a first lug plate group, one end of the chord member is fixedly provided with a second lug plate group, the first lug plate group is connected with the second lug plate group through a pin shaft, the inner wall of the hemispherical shell is provided with a cross-shaped annular stiffening plate, the outer wall of the hemispherical shell is provided with a diagonal web member, and the hemispherical shell is fixed at one end of the cylinder.

Inventors

• WANG HAIGANG
• WEI QIANG
• LI QINGJUN
• LI GUOGUANG
• XU CHENGQIANG
• CHEN XIN
• Xing Chengbo
• WANG TING

Assignees

• 同圆设计集团股份有限公司

Dates

Publication Date

20260505

Application Date

20260210

Claims (10)

1. 1. A large-span heavy-load steel structure mid-span support node structure is characterized by comprising a cylinder, a hemispherical shell and a chord member, wherein a multi-layer annular stiffening plate is fixed on the inner ring of the cylinder along the height direction of the inner ring of the cylinder, a first lug plate group is fixed on the outer ring of the cylinder, a second lug plate group is fixed on one end of the chord member, the first lug plate group is connected with the second lug plate group through a pin shaft, a cross-shaped annular stiffening plate is arranged on the inner wall of the hemispherical shell, an inclined web member is arranged on the outer wall of the hemispherical shell, and the hemispherical shell is fixed on one end of the cylinder.
2. 2. The large-span heavy-duty steel structure mid-span support node structure according to claim 1, wherein the cross-shaped annular stiffening plate protrudes out of the hemispherical shell to a set length, a clamping groove is formed in one end face of the cylinder, and the cross-shaped annular stiffening plate is inserted into the clamping groove.
3. 3. The large span heavy duty steel structure mid-span support node construction of claim 1, wherein a plurality of first ear plate sets are provided along the circumferential direction of the cylinder.
4. 4. The large span heavy duty steel structure mid-span support node construction of claim 1, wherein a bottom plate is welded to an end of said cylinder not connected to said hemispherical shell.
5. 5. The large span heavy duty steel structure mid-span support node construction of claim 1, wherein the area of said bottom plate is greater than the area of the cylinder end.
6. 6. The mid-span support node construction of a large-span heavy-duty steel structure of claim 1, wherein one end of said chord member is provided with a closure plate, and wherein the second set of ear plates is secured to the closure plate.
7. 7. The long span heavy duty steel structure mid-span support node construction of claim 1, wherein a plurality of said diagonal web members are provided, the plurality of diagonal web members being welded to the exterior of the hemispherical shell.
8. 8. A method of making a large span heavy duty steel structure mid-span support node construction as defined in any one of claims 1-7, comprising the steps of: Welding the cross stiffening plate inside the hemispherical shell by adopting bilateral penetration, and then determining that the inclined web members with proper lengths respectively penetrate through the top surface of the hemispherical shell corresponding to the annular stiffening plate; processing a cylinder, welding the lug plates and the cylinder with the four clamping grooves by adopting double-side penetration welding and single-side penetration welding to form a whole; And processing the chord members, and welding and forming the sealing plates, the lug plates and the chord members with proper lengths respectively.
9. 9. The method for manufacturing the large-span heavy-duty steel structure mid-span support node structure according to claim 8, wherein the method for determining the wall thickness of the cylinder is as follows: Taking the annular stiffening plate and the cylinder wall as a continuous beam, and then taking the value of the wall thickness of the cylinder according to the following formula; ; Wherein h is the wall thickness of the cylinder wall, f is the design strength of the material of the cylinder wall, M is the maximum value in M In the edge 、 M Middle support 、M Middle (middle) , M In the edge is the maximum bending moment value in the span range of the cylinder corresponding to the first layer annular stiffening plate and the second layer annular stiffening plate, M Middle support is the bending moment of the cylinder corresponding to the middle layer annular stiffening plate, and M Middle (middle) is the midspan bending moment between the two middle layer annular stiffening plates.
10. 10. A method of installing a large span heavy duty steel structure mid-span support node construction as defined in any one of claims 1-7, comprising the steps of: The first step, a lifting appliance is adopted to be mounted to a designated exact position by taking a pin shaft hole on a first lug plate group on a cylinder as a lifting point position; hoisting the hemispherical shell part to enable the hemispherical shell cross stiffening plate to be inserted into the barrel-type part clamping groove, and welding by adopting a field melting head; and thirdly, connecting the second lug plate group and the first lug plate group of the horizontal chord member by utilizing a pin shaft.

Description

Large-span heavy-load steel structure mid-span support node structure and method thereof Technical Field The invention relates to the field of design of large-span heavy-load steel structure mid-span support nodes, in particular to a large-span heavy-load steel structure mid-span support node structure and a method thereof. Background In large-span heavy-load steel structure engineering (such as indoor skiing field, large-span theme park and the like), the span middle support node is a core component for transmitting truss or net rack axial force and guaranteeing structural stability. However, as the span of the engineering is increased and the load is lifted, the axial force of the truss or the net rack chord member and the web member is obviously increased, so that the section size of the rod member is continuously enlarged, the section diameter of the chord member in partial engineering is broken through by 1200mm, the section of the web member is generally more than 800mm, and the existing support node structure and the corresponding design method all expose technical defects that the support node structure is difficult to adapt, and the method comprises the following steps: At present, the traditional construction form of the mid-span support node of the large-span heavy-load steel structure is that a chord member is directly connected to the support node in a penetrating way, a web member is connected with the chord member or the support node through a welding ball, and the connection specification of the welding ball and the chord member and the web member is assumed to be in a hinged mode. The structural form has multiple problems in the application scene of the large-section rod piece, namely, when the chord member is directly connected to the support node in a penetrating way, the structural characteristic of the large-section rod piece is limited, the secondary bending moment at the end part of the node is obviously increased, the additional stress generated by the secondary bending moment is shown by partial engineering measurement and calculation to be 30% -40% of the axial force stress, the additional stress completely exceeds a negligible range, the bearing stability of the node is seriously affected, secondly, the welding construction difficulty of the large-section thick-wall rod piece is extremely high, the welding deformation control difficulty is high, the weld defect inspection qualification rate is difficult to ensure, the engineering applicability of the traditional structure is further limited, thirdly, the welding ball diameter of the large-section rod piece is required to be increased to be 1200mm or more in the traditional structure, the welding ball connection of the traditional hinging form cannot be matched with the size requirement, the actual bearing capacity of the node exceeds 25% of the expected deviation of the design, the bearing requirement of the large-span heavy load cannot be met, fourthly, the method requires excessively adding the wall thickness of the rod piece at the node, the traditional structure is required to be greatly increased, the stress concentration at the weld seam, and the actual measurement data shows that the peak stress of the node can reach 1.5 times of design value, and the long-term service safety hidden trouble of the structure. In addition, the design method of the existing support node structure is mainly based on the current specifications such as the space grid technical specification, the steel structure standard and the like, and the core design logic is that the node bearing capacity is calculated according to the hinged node, and only when the length-diameter ratio of the secondary pipe is not less than 24 or the length-diameter ratio of the primary pipe is not less than 12, the hinged node calculation mode can be adopted, and meanwhile, the fact that if the ratio of stress generated by bending moment to stress generated by axial force is greater than 0.2 is stipulated, the influence of the secondary bending moment is required to be counted. The design method has obvious limitations that in a large-span heavy-load project, the length-diameter ratio of a large-section rod piece is usually only 8-10 for balancing structural rigidity and span requirements, the calculation limit value of a hinging node is far lower than the calculation limit value of the hinging node specified by specifications, forced hinging design can lead to insufficient safe storage of the node and cannot guarantee structural bearing reliability, on the other hand, when the influence of secondary bending moment is calculated according to the specifications, the section of the rod piece at a support connecting position needs to be greatly increased, the section of the rod piece in the partial project needs to be increased by more than 30% compared with an ideal state, serious steel waste is caused, in addition, a calculation formula of the bearing capacity of a welding