Abstract
The launching erection of steel girders has been taking place much more often at present. There are two major methods of launching. The first uses hydraulic sliding shoes, and the second uses sliding plates and extrusion oil jacks. Both are effective methods and are selected to suit the respective characteristics. The former method was established first and applied even to a sharply curved steel girder some years ago.
However, it is only recently that there has come to be sufficient experience with the latter method. The authors have performed various investigations in order to bring about the establishment, and had an opportunity of the launching erection for a curved teel girder by using concentrated system first in Japan.
This report deals with a few discussion about the reaction force control as a result of many investigations and field measurements. Because the control which assures of the web plate strength is one of the major problems of erection.
