Yes I did, but did not really understand. It is an iron/steel rod embedded into the concrete ground slab of your house, into which the rebars of the supporting columns' rebars are connected, no?
The rebars in all columns of my house go into concrete blocks, so would that suffice if the ground cable from my fuse box were connected to one of them please?
By the way, I do have earthed sockets throughout my house, with a thick cable connecting to a 2 metre steel pole driven into the ground.