(10) WO 2017/132425 Al
(57) What is provided is a precast hollow block, a precast wall system incorporating the precast hollow block, and forms for manufacturing the precast hollow block and other components of the precast wall system. Each of the hollow blocks has a hollow interior space in the center that adds mass to the cross-section of the assembled wall when filled with reinforcing steel or concrete. The result is the formation of an effectively water-tight wall with greater structural stability that can follow the grade at the top of the wall. The precast...