Method and system for embodying a plane reference surface defined by a specific equation on an assembling frame of a structure from a rough surface

A method for causing a rough surface on a girder of a frame structure being assembled to be machined to a plane reference surface defined by a specific equation, said method comprising the steps of:

• (a) storing data relating to the equation characteristic of said reference surface in a memory means;
• (b) using an optical sighting means to measure data characteristic of the position and orientation of said rough surface and using said data to calculate an equation which characterizes said rough surface;
• (c) comparing the data relating to the equations of said reference surface and said rough surface in an information processing unit;
• (d) positioning a mobile machining device mounted and moved on said girder of the structure frame being assembled close to said rough surface;
• and
• (e) correcting said rough surface with the aid of said machining device to progressively make the equations characteristic of the rough surface and the reference surface coincide with each other, said machining device being controlled by specific orders according to said comparison of the respective equations characteristic of the rough and reference surfaces, said orders being provided by said information processing unit.