Advantages and disadvantages of pile driving methods
First of all, there are two kinds of piles: one is precast pile, and the other is concrete filling pile.Piles involved are generally precast piles.The pile driving methods of precast piles are hammer method, static pile method, vibration method and water hammer method.
Here are some of the advantages and disadvantages of the above methods:Hammer method:The method is simple in construction, small in investment and convenient in construction, and has been widely used before.But there is a cut that doesn't go around. It's too noisy and doesn't work in hard soil or soft soil. It's being phased out.Static pile:Use the static pressure to press the pile into the ground, no vibration and no noise during construction. Applicable to weak soil and adjacent to the construction of structures that are afraid of vibration.But when there is a sandwich of medium thick sand with thickness greater than 2m, it is not suitable to use the static pressed pile. And there is soil squeezing effect.Vibration method:The vibration hammer is lifted to the top of the pile, pile head is connected with the vibration box pile cap or hydraulic pile clamping device for clamping, the exciting force generated by the vibration hammer pile to soil vibration, friction force between soil particles is greatly reduced, the pile under the action of self weight and mechanical force into the soil.The vibrating pile driving equipment has the advantages of simple structure, convenient operation and high efficiency. Suitable for heavy steel sheet pile, steel pipe pile and the length within the 15m slender reinforced concrete precast pile in the sand in the highest efficiency, poor little clay.
Pile jetting:Pile jetting method often with hammer (or vibration) method and use. In the sand with gravel or hard soil, with water, supplemented by hammering or vibration; in silty clay or clay, generally by hammering or vibration, water supplement, and control the water content and time. Water pressure and flow rate are determined according to geological conditions, pile driving tools, the depth of pile sinking, the diameter of pipe and the number of pipes.These are the common pile foundation construction methods and advantages and disadvantages.
