| 摘要 |
PROBLEM TO BE SOLVED: To install a main girder having excellent appearance easily using a plurality of outer forms of different sorts in the restricted working space of a mobile type working vehicle without enlarging the distance from the fixed point of a frame relative to an existing main girder to the load acting point on the frame. SOLUTION: A lower form receptacle 7 hung down at the main frame 2 of a mobile type working vehicle 1 is sunk for a certain distance in the foremost working division, and in a plurality of outer forms 28 and 29 which has been in service, the outer forms 28 or 29 is moved from the division backward in the bridge axis direction to be accommodated in the back retreat region 21 under the existing main girder 40. The outer forms to be put in service 28 or 29 at the time is moved to inside about the cross wise direction from a side retreat region 25 and supplied to the foremost working division, or otherwise, the outer form 28 which has been in service is moved to outside about the crosswise direction from the foremost working region and accommodated in the side retreat region 25, and the outer frames to be put in service 28 or 29 is moved ahead in the axial direction from the back retreat region 21 and supplied to the foremost working division. |
