THE CONSTRUCTION METHOD OF BASEMENT DRAINAGE

摘要

A construction method of a drainageway is provided to keep uplift pressure regularly and to prevent the excessive discharge of underground water by ascending or descending a drainageway to the appointed height to have the differential head of water and distributing pressure evenly. A construction method of a drainageway for keeping optimum water pressure comprises the steps of leveling up an excavation plane(1) and installing drain boards(10) on the leveled excavation plane to function as a drainageway and placing lean concrete(20) and bottom concrete(40), decompressing to ascend and descend the drainageway to the appointed height from the excavation plane to be located higher than the lean concrete and the bottom concrete, and forming a lean concrete layer by placing mortar to the appointed height on the excavation plane.