The function of expansion installation, the advantage of Maurer expansion installation and control of installation quality are mainly introduced in this paper.

Repair of Molor expansion joints of Piaozhu Bridge;

Construction management of expansion joint of bridge on highway;

Reformation of expansion joint in Fenglingdu Yellow River Highway Bridge;

Modified Braun bridge expansion joint;

Design and construction of GQF’s expansion and contraction installment;

Discuss how to change large displacement expansion device

The damage causes of expansion device of Qijiazhuang Bridge on Jing-Zhang Expressway are analyzed, and the considerable problems in calculating expansion space are presented in this paper.

Combined with the practice,the paper introduced the structure and usage of large displacement expansion device,proposed the choice suggestion and improved plan for reference.