The water collection well dewatering method is generally suitable for clay soil layers with small precipitation depths and coarse-grained soil layers or small seepage amounts. When the foundation pit (groove) is dug close to the groundwater level, a drainage ditch with a certain slope is excavated along the bottom of the pit (groove) or **. The bottom of the trench is 0 lower than the excavation surfaceMore than 5m, and according to the size of the amount of groundwater, every 20 40m set up the collection well, the bottom surface of the collection well is lower than the excavation surface 1 2m, so that the water flows into the collection well along the drainage ditch, and then the water that flows into the collection well is pumped out with a water pump, and the bottom surface of the foundation pit (groove) can continue to excavate. When the bottom of the foundation pit (groove) is close to the bottom of the drainage ditch, the depth of the drainage ditch and the collection well is deepened, and so on until the foundation pit (groove) is dug to the required depth. The water collection well dewatering method is suitable for the situation that the groundwater volume is not large and the soil quality is good, and it is not suitable for use when encountering quicksand.
Drainage ditch: set around the bottom of the foundation pit, the bottom width is 300mm, the bottom of the ditch is 500mm lower than the bottom of the pit, and the slope is 1%.
Water collection well: set along the bottom corner of the foundation pit, spacing 20 40m, diameter 06~0.8m, the bottom of the well is 1 2m lower than the bottom of the pit. For long-term use, there are wall protection and gravel pressing bottom.
In the setting of the water collection well, the bottom of the well is lower than the excavation surface 08m~0.9m