Support method for old pipe inspection well in embedded excavation position of water inlet pipe of sewage pumping station

The invention relates to embedment of a water inlet pipe of a sewage pumping station, in particular to an old pipe inspection well in the embedded position of the water inlet pipe of the sewage pumping station. A support method for the old pipe inspection well in the embedded excavation position of the water inlet pipe of the sewage pumping station comprises steps as follows: a row of steel sheet piles are driven in the position of a reserved pipe, an SMW (soil mixing wall) retaining structure which cannot be closed is closed, diagonal bracing is constructed with steel enclosing purlins of a deep foundation pit along with excavation, and stability of the steel sheet piles is guaranteed; soil stabilization is performed on surrounding soil of the outside inspection well by high-pressure jet grouting piles, so that the surrounding soil forms a whole, and lateral displacement of the old well due to non-uniform pressure of two sides of the old well is prevented in a form of a gravity dam; double-liquid grouting is performed in a range of 3 m under the elevation of a bottom plate before excavation at a joint of the bottom plate and the old well. With the adoption of the support method, the stability of the soil in the excavation position can be improved and smooth proceeding of an excavation surface can be guaranteed.