Joke Collection Website - Mood Talk - Independent foundation, but I'm just getting started. I don't understand at all. Please tell me what's in this box, steel bar? What is 40d?

Independent foundation, but I'm just getting started. I don't understand at all. Please tell me what's in this box, steel bar? What is 40d?

This is a detailed drawing to tell you how this foundation is made. J- 1 is a plan view, and 1- 1 is a sectional view.

The reinforcement at the bottom of the independent foundation is a steel mesh with a diameter of 10mm, and the vertical and horizontal spacing is 100mm. The bending length of the bottom of the column steel dowel is 100 mm, which is not shown in the 40-day photo. It may be the anchorage length.