(01) It avoids the phenomenon of concrete piping in adjacent holes that easily occurs when using super-retarding concrete secant piles to complete cutting and interlocking. At the same time, the use of conventional concrete reduces the requirements for concrete and saves costs.

(02) Due to the hard cutting process, the disadvantage of being unable to perform B-pile secant construction because of excessive strength of A-pile concrete caused by prolonged single-pile formation time will not occur.

(03) When encountering hard large-area underground obstructions, the full-rotation drilling rig can directly remove underground rock layers and obstructions during pile formation, achieving one-time pile formation.

(04) The full-casing full-rotation drilling rig itself has a water-stop wall protection function, requiring no additional wall protection measures. It is an energy-saving and environmentally friendly construction process.

(05) According to the grab bucket soil extraction depth, the soil layers can be accurately distinguished, and a suitable pile tip bearing layer can be selected.

(06) The soil extracted from the hole has low water content, is convenient for outward transport, and there is no concern about mud polluting the environment; the construction site is clean and civilized, making it extremely suitable for construction within urban areas.

(07) Settlement and displacement are easy to control, and construction can be carried out adjacent to nearby buildings and underground pipelines.

(08) The full-rotation follow-up casing drilling and other excavation methods effectively prevent quicksand and mud inflow in the hole, and can perform rock socketing, ensuring pile formation quality.

(09) The second-stage pile is constructed by cutting and interlocking between the two completed first-stage piles. The full-casing hole protection method ensures tight interlocking between piles, and the pile concrete solidifies into one body, forming a good overall continuous structure.

(10) The reinforcement ratio is relatively low because bored secant piles can adopt an arrangement of reinforced concrete piles and plain concrete piles alternately;

(11) The impermeability is stronger because bored secant piles are constructed continuously, with no construction joints between piles, whereas the construction joints at the panel joints of underground diaphragm walls are often weak points for seepage prevention;

(12) Construction is flexible because bored secant piles can turn and change alignment as needed during construction, making them more suitable for constructing foundation pits with variable planar geometries or various arc shapes.