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INSTALLATION OF UNDERGROUND DRAINAGE, image, image, image, image, image,…
INSTALLATION OF UNDERGROUND DRAINAGE
INSTALLATION PROCESS
2.EXCAVATION
, The surveyor marked out the dept of the trench to be excavated with a mechanical excavating machine
1.MARKING OF ALIGNMENT
, The surveyor marked out the alignment for the trench to be dug
3. CONCRETE BLINDING
, Blinding is done on the surface area to correct any irregularities in the level of the bed of the excavated surface, and to provide a smooth, level and regular surface to receive the concrete base. It’s usually ±50 mm depending on the rate of the regularity of the surface area. Concrete Grading C10 or C15 as a sub-soil might require.
4. REINFORCEMENT POSITIONING
, For a 1m x 1m drainage, a 12mm U shape reinforcement (spaced between 150mm to 300 mm or as designed) is placed into position on the blinded surface but positioned at the center of the base with the aid of concrete biscuit to create a concrete cover.
There should be concrete cover between the reinforcement and the base of the drain concrete base and the top of the drain wall
5. LAYING OF CONCRETE BASE
, A guiding panel is placed into position to the guild in the laying of the concrete base to achieve a uniform alignment base edge, thickness and width, also to manage concrete material while pouring. The base is cast with the U shape reinforcement bottom in between the concrete base achieving concrete cover below and above
6. SIDEWALL PANEL FORMWORK
, The floor base is marked to give the required one-meter internal width where the panel will be positioned. The panel wall spacing is 100mm, and a wall height of 1000mm, the panel is lubricated, clipped, and prepared to accept the Concrete.
7. BACK FILLING AND COMPACTION
, Must be done quickly after back-filling to avoid settlement
EQUIPMENTS
DIGGER
SPIRIT LEVEL
HOE
THREAD
