Professional space frame manufacturer

 In the general notes of steel structure construction drawings, have you ever written a line like this: “Drafted, stamped, and issued.” Everything seems to flow smoothly. “For this project, Grade 1 welds shall undergo 100% non-destructive testing, Grade 2 welds shall be subject to 20% sampling inspection, and Grade 3 welds shall undergo visual inspection.” However, if someone were to ask at this moment, “Why must this weld be Grade 1, while that one can be Grade 2? Who exactly determines this ‘grade’?” would your answer still flow so smoothly? This question, though seemingly basic, represents the most fundamental—and yet most easily overlooked—underlying logic in steel structure welding design. The classification of weld quality grades is by no means arbitrary, nor is it a matter of the designer’s “whim.” It is underpinned by a clear, rigorous set of principles, proven through engineering practice, which directly determine the structural safety and service life of the structure. T...

Steel structures constructed in seismic zones must meet the following design requirements: 1. For seismic fortification levels of 7 or higher, horizontal bracing should be installed around the perimeter sections of the truss within its support plane. Theoretical calculations indicate that horizontal bracing enhances the truss's lateral seismic performance. For perimeter-supported trusses, three types of chord member configurations exist for the bracing plane: (1) Orthogonal-orthogonal type: Diagonal members are installed within the peripheral grid to form a closed system. (2) Orthogonal-oblique type: Horizontal members are arranged along the boundary to form a closed system. (3) Triaxial type: The support plane itself is composed of geometrically stable triangles, thus requiring no additional bracing. 2. The slenderness ratio of members within the peripheral 2–3 grid zones shall not exceed 180. This is because the chord members along the perimeter of the space frame experience rel...

  Steel structures are primarily composed of steel components, characterized by steel beams, steel plates, steel columns, steel trusses, and other elements; they are a major type of building structure, connected through welding, bolts, or rivets between each member or component. When damage occurs in a steel structure, it should be identified and addressed immediately. (1) Insufficient load-bearing capacity due to changes in load, overtime work, or revisions to standards and regulations; (2) Deformation, distortion, loss of functionality, or indentation of components caused by various accidents, leading to weakened cross-sections, warped members, or cracked connections; (3) Deformation, cracking, or warping of components or connections caused by temperature differences; (4) Corrosion and electrochemical corrosion caused by chemical erosion, weakening the cross-section of steel structure components; (5) Other issues including errors in design, production, or construction, as well a...

 1. Bolted Spherical Node Defects Threaded Hole Machining Accuracy Issues The threaded holes in bolted spherical nodes are critical components where machining precision is paramount. In actual production, issues such as positional deviations and uneven pitch frequently occur. For instance, excessive positional deviation can result in loose connections between bolts and spheres, preventing effective load transfer and degrading structural performance. Uneven pitch impedes bolt insertion and tightening, leading to insufficient preload. In large-span space frames, this may cause node loosening and compromise overall structural stability. Bolt Sphere-Member Connection Issues Bolt spheres typically connect to members via bolted joints. In practice, bolt length, diameter, and tightening torque all affect connection quality. Insufficient bolt length compromises the connection's integrity, increasing the risk of disengagement under external forces. Excessive or insufficient tightening torq...