1results about How to "Controllable duration" patented technology

This invention discloses a construction method for rotary drilling piles used in water conservancy and hydropower engineering. The method involves setting up a first row and a second row of rotary drilling piles at a predetermined elevation on the river-facing side of the foundation pit. These piles interlock and their tops are flush. A capping beam is also included at the top of the first and second rows of rotary drilling piles, connecting and fixing them into a vertical, closed wall. A diaphragm wall is also installed inside the foundation pit, with one end connected to the solid wall and the other end connected to the bedrock. The interlocking of the two rows of rotary drilling piles, along with the construction of the capping beam and diaphragm wall at the top of the piles, forms a continuous, closed foundation pit protection structure. The entire construction process facilitates the excavation and layout of the outlet retaining wall foundation after the flood season, saves construction time, reduces construction costs, and provides functions such as cofferdam seepage prevention, scour prevention, soil retention, foundation pit protection, and foundation bearing capacity.