What is the length of the bottom pipe of the bored pile conduit? The specification requires that the length of bottom pipe of bored pile should not be less than 4m. Why is the length of the bottom pipe required? Because bored piles are usually underwater concrete, the code stipulates that the buried depth of concrete at the bottom of conduit should not be less than 1 m and should not exceed 6 m, while the length of other conduits is about 3.5 m.
If the length of the bottom pipe is less than 4m, the bottom pipe may be pulled out of the concrete when the pipe is dismantled, resulting in broken piles. Therefore, it is reasonable that the length of the bottom pipe of the catheter should not be less than 4m. Does the cast-in-place pile conduit float up and down?
Vibrating is that when the conduit is buried too deep in concrete, it will float up and down, which can make the concrete fall faster and prevent the conduit from solidifying in concrete during the initial setting of concrete, resulting in the conduit not being pulled out. If the interval between concrete pouring is too long, the usual method is to shake up and down and dismantle the pipe. Prevent the concrete from sticking to the conduit for a long time, and the concrete solidification conduit will not be easily pulled out. Vibration is not the purpose, but it can't be said that there is no such effect.
What is the conduit function of concrete cast-in-place pile? Hole cleaning, slag cleaning and mud specific gravity adjustment; Pouring underwater concrete; Ensure that the concrete is sent directly to the bottom of the pile; Anti-insertion concrete plays a compact role.
Because bored piles are usually underwater concrete, the specification stipulates that the buried depth of concrete at the bottom of the conduit is not less than 1 m and not more than 6 meters, while the length of other conduits is about 3.5 meters. If the length of the bottom pipe is less than 4 meters, the bottom pipe may be pulled out of the concrete and lead to pile breakage, so it is reasonable to require that the length of the bottom pipe of the conduit should not be less than 4 meters.
Cast-in-place pile system refers to the pile formed by mechanical drilling, steel pipe extrusion or manual excavation in foundation soil, and placing steel cages and pouring concrete in it. According to the different hole-forming methods, cast-in-place piles can be divided into immersed cast-in-place piles, bored cast-in-place piles and dug cast-in-place piles.