Mounting or distributing box include packing ring out of elastic material installed in inlet orifice of case of box or setting ring as the uttermost component of inlet orifice

摘要

Case (1) of box or setting ring (2) are made by means of two-component process and include packing ring (11) out of elastic material installed in inlet orifice of case (1) of box or setting ring (2) as the uttermost component of inlet orifice. The packing ring blocks access to cast materials (concrete) into the box during fabrication of cast wall. The packing ring has an external edge. There is also a fastening ring out of elastic material and a wedge ring; by means of the wedge ring the fastening ring is stretched radially outside for fastening engagement with internal periphery of box case.