drainage of foundation pit的意思|示意

'

Foundation pit drainage refers to the measure taken to drain out the groundwater at the foundation pit to prevent collapse caused by the excessive water pressure or insufficient bearing capacity. It is commonly used for the foundation pit of tall buildings, deep engineering and water conservancy and other engineering works.

1. Before the excavation, silt fence and water pipe should be set up around the foundation pit, and the water flowing in should be measured and the sediment content should be analyzed. The water should be forcibly drained out under the premise of reducing the groundwater level around the foundation pit.

2. During the excavation, the water coming in and out of the foundation pit should be strictly monitored, and the groundwater level around the foundation pit should be monitored as well. If the groundwater level around the foundation pit is higher than the design value, timely measures should be taken to reduce the groundwater level, such as deepening the groundwater drainage trenches, increasing the water discharge rate, etc.

3. A few days before pouring concrete, the foundation pit should be drained again to reduce the water content of the soil, which can prevent the soil from expanding and the concrete from cracking.

4. After pouring concrete, drainage facilities should be set up around the foundation pit for a long time to prevent the groundwater from rising around the foundation pit and causing the foundation to collapse.