It would seem - grillage and blind area - these are two heavily compatible things.
In this article I want to offer you a way to close the space between the grillage and soil, followed by concreting the blind area.
To begin with, I took 2 pipes that are longer than the span of the grillage and cut the edges at an angle to emphasize the pipes on the pillars of piles.
Then I drilled holes in the pipes for fittings, and, in one, the central hole is through. The holes are opposite each other.
He laid the bricks on the sand cushions, and on them laid the bottom pipe with a through hole.
I inserted a reinforcement bar into the hole and hammered it into the ground to the required height of the top point of the bar.
In the other 2 holes, I also inserted pieces of reinforcement and installed, in terms of level, a second pipe.
Then I cut out and installed a fixed “formwork” from a flat slate, with the condition that there remains a gap between the grillage and the slate sheets to ventilate the underground space.
For the blind area, I poured a sand cushion and rammed it with water, while the sand was wet, leveling it out. To prevent erosion of water by the sand and the germination of grass, he spread the material with which the beds were covered for the winter.
Cutting out jumpers to separate the slabs laid concrete.
The ventilation slit is closed using a flat slate cut out in the autumn and fixed on the grill “upside down”.
All successful inventions.
