Method for pore-creating of geology with aleurite layer of upper part and middle, slightly weathered siltstone layer of lower part
A technology of slightly weathered and siltstone, applied in excavation, sheet pile walls, construction, etc., can solve the problems of long impact time, low efficiency, and slow hole forming speed, and achieve pile hole cost reduction, wide application range, and low noise Effect
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specific Embodiment approach 1
[0005] Specific embodiment one: the upper part of this embodiment is that the bottom of the silt layer is the pore forming method of medium and slightly weathered silt layer geology to realize by the following steps: one, at first rotate the silt layer on the pile foundation top with the rotary drilling drill The mud used in the excavation construction and rotary excavation construction is made of bentonite or clay, the concentration of the mud entering the hole is 1.15-1.25, and the viscosity of the mud entering the hole is 18-24S; the performance requirements of the clay: colloidal rate ≥ 95%, sand content ≤ 4% , PH value ≥ 6.5, plasticity index greater than 25, and clay content of particle size less than 0.005mm greater than 50%; 2. When the pile foundation rotary excavation is constructed to the top surface of moderately weathered siltstone or slightly weathered siltstone, stop the rotary excavation and place The rotary drilling drill is removed; 3. Add the clay in the pile...
specific Embodiment approach 2
[0006] Embodiment 2: In this embodiment, the concentration of the mud entering the hole is 1.2.
specific Embodiment approach 3
[0007] Specific implementation mode three: In this implementation mode, the viscosity of the drilling mud is 21S.
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