To render a formwork, having a hollow defined therein and embedded in the elongated concrete member during casting of a concrete material, to be lightweight, environmentally friendly and inexpensive and to have a sufficient strength, the formwork includes a tubular member formed by bending an oblong plate of corrugated cardboard made of paper. An information management application residing within a computing device enables a user to integrate various information items of various types and sources using a many-to-many relationship for each information item. The automatic-filling module includes a sensing unit, a reservoir, a filling pipe and a pressuring unit. At least one electrical box is coupled to the tray member.