On December 27, the 2019 engineering construction science and technology award conference was held in tianjin. The research on key technology and safety evaluation of long-span grid structure construction completed by China railway 21st bureau 4 company won the second prize of science and technology progress award of China construction enterprises association.

The achievements in xi 'an east bus rack ZhengBeiSuo engineering construction process, for wear golden flowers under the tunnel and the plane layout of bearing pedestal more complex construction environment, construction scheme of MPF ascension, to simulate the actual working condition of the construction of space truss structure, choose the asymmetry, irregular, hoisting position to solve the tower arrangement point selection under the condition of complex technical problems. Through the research on tower, rigging, lifting point, wind rope and computer controlled lifting technology, the technical problem of stable lifting and precise positioning of the grid structure during the construction of the bolt ball net frame of the large-span flat structure under the complicated lifting point is solved. Through the structural monitoring of the hoisting process of the network structure, the whole hoisting process of the network structure has been controlled by information technology, and the overall level has reached the leading level in China. (su hong ling)