Common quality problems in grid structure engineering

       Common quality problems of grid structure engineering

       (1) bending deformation or local fracture of the bar;

       (2) The connection of sealing plate or cone head weld is damaged;

       (3) The joint is deformed or fractured;

       (4) The weld is not full or there are bubbles, slag inclusion and micro cracks, which exceed the specified standard;

       (5) The high strength bolt is broken or pulled out from the ball joint;

       (6) The members collide at the nodes, and the web member of the support collides with the supporting structure when the upper chord is supported;

       (7) The displacement of bearing node;

       (8) the deflection of grid structure is too large, exceeding 1.15 times of the corresponding design value specified in the design.