Support of the sides of an excavation made out of concrete, bricks, stone or precast concrete rings. During construction, the lining provides protection against caving and collapse and prevents crumbling ground from filling up the dug hole. After completion of the well it retains the walls.
Support of the sides of an excavation made out of concrete, bricks, stone or precast concrete rings. During construction, the lining provides protection against caving and collapse and prevents crumbling ground from filling up the dug hole. After completion of the well it retains the walls.
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