background to develop honeycomb girder 1. Box-type girder: large load, quadrangle end face, large windage area, but unsafe in field work and working high above the ground 2. Truss girder has lighter self-weight than honeycomb girder, small windage area but low stiffness and low overall stability. if one of the connection points goes wrong, the entire girder will be in trouble which leads to unsafe construction and quality un-guaranteed 3.The new-style honeycomb girder developed by our company solves the problem above, and ¡° isosceles triangle honeycomb girder¡± wins the patented product