In the construction method at three layers of slabs are connected by props, the construction load is transmitted to the props and acts as a concentrated load on each slab. Each slab is subjected to uniformly distributed loads due to construction work. In this paper, we set up a frame model in which both uniformly distributed load and concentrated load act on three layers of slabs connected by props and proposed a calculation method for this model. In addition, we applied this calculation method to actual construction work and compared the calculated and measured values of prop axial force.