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The steel casing is in the process of manual digging piles. Due to the unstable soil and the difficulty of constructing the reinforced concrete retaining wall, the steel retaining wall is used to protect the hole piles to prevent the collapse of the holes from affecting the construction progress and safety. The steel casing is a circular barrel with two ends that are hollowed out according to the size of the hole pile.

Effect
It can stabilize the hole wall and prevent the boring. It can also isolate the surface water, guide the drill bit, fix the pile position, and protect the original ground.

Nature
Generally, it is 20-40cm larger than the pile diameter. The depth of the embedding depends on the nature of the soil. The deviation of the plane position should not exceed 5cm, and the inclination should be less than 1%.