The author of this paper mainly introduces the drawing-up tower crane s assemble and disassemble plan,and some problems in the process of its installation,application and disassemble as well.

Drawing up of the demolishing scheme of continuous double arch bridge and its on-site demolishing construction supervision;

In order to overcome the limitations of the method that hard to refine the internal force of the arch rib as well as possibly too large precambers,taking notice of the influence by the time,order and method of cable-removing before and after the closure to alignment and internal force of the rib,the modified cable-removing schemes are brought forward.

This paper made a detailed description on the working principle of interference fit (no key) connection of conical surface and the calculating methods of its strength and stress, as well as the liquid pressure dismounting method.