Shaft platform beams are designed for wall formworks to fit on elevator shafts and to form a platform where the workers can work safely on this area. Gravity pawls are mounted to the edges of shaft platform beams and secondary beams and wooden platform on them. They can be shifted to the next stage in a cycle by means of crane. While the gravity pawls mounted to the edges of shaft platform beams allow the platform to move upward, they also prevents it to move downward.