Various types of material handling robots (AGVs, Automatic Guided Vehicles) have been developed to improve the work efficiency at construction sites, yet neither of them has been popularized. In this work, we present a gate-type robot suitable for automatic material handling during interior construction. The effectiveness of the robot has been evaluated through experiments in real construction sites. A gate-type robot has the following three characteristics: (i) the payload-weight ratio is near 5; (ii) picking and placing of randomly located carts (loaded with building materials) is possible; (iii) complex environments at construction sites can be navigated smoothly without unnecessary movement.
