Combining with the practical engineering, the rust-eaten status and its harmfulness of steel structural charge shed on expressway are analyzed, meanwhile the application materials, construction technique, cost and antisepsis effect of descaling and antisepsis engineering are introduced, which can be consulted by peers.

Inner force analysis of arch shed structure reinforced by freezing whose shield is unkenneling;

Arch shed structure of soil freezing reinforcement for a shield to break through the launching pit wall is simplified into two computation models: fixed-end circular arch with single centre and arch supported on vertical walls.

The arch shed structure of soil freezing reinforced method to the shield tunne- ling setting out is simplified into these two calculation models Non-articulated Arch with single centre and arch-wall.