According to the lateral force analysis of the single column tower of Qi Ao bridge, the small lateral horizontal component of the cable force (correcting force) is discovered, which is often ignored in practice and can greatly increase the lateral load carry capacity of the tower.

The paper introduces the influence of pre-eccentricity of single-pier support on torsion re-distribu-tion of continuous curved bridge,and shows the method and produce of optimal pre-eccentricity distances of single-pier support by graphic method,at last,we take the three span single-pier small radius curved boxed bridge as an example to illustrate it furtherly.

The mainly leading technology of the directional blasting demolition of the column-type water tower is systematically described,including how to ascertain the explosive notch height and the explosive parameters,how to design the explosive mesh and how to take the explosive safe measures.