Procedure for making protected concrete channel composed of successive voussoir sections comprises protecting voussoir faces with protective coating before installing it

摘要

In tunnel (2) bored in ground are placed prefabricated concrete voussoir crown sections (3) which form channel. Voussoir are made by pouring and hardening concrete in mold. Mold walls are coated with protective coating (5) appropriate to kind of corrosive liquid expected on site. Each voussoir joint has groove for receiving material able to ensure sealing between contiguous sections.