Construction technology for protecting tool type elevator shaft installed on front vertical face without disassembly and change

The invention discloses a front facade installation tool type elevator shaft protection construction process without disassembly and change, which comprises the following steps: after a protection frame and a hard isolation layer are erected in a shaft, firstly drilling holes in the inner side of the wall of the shaft, then installing a steel plate with holes, and finally welding a round pipe. And a round pipe is welded on a crosspiece on the protective fence door and is conveyed to a mounting position. The short end of the connecting piece is inserted into the round pipe of the rear steel plate, the long end with the thread is inserted into the round pipe of the upper crosspiece of the protective fence door, and the nut is screwed down. When an elevator front room is decorated, the lower crosspiece of the protective fence door is heightened, so that the distance between the protective fence door and the outer side face of the shaft wall has the requirement for decoration operation. Before construction of the