According to the different methods of driving pine piles, they can be divided into manual pile driving and mechanical pile driving. Commonly used pile driving machines include hand winches and diesel pile drivers. Hydraulic excavators are also often used to drive piles. Hydraulic excavators are used to drive piles. Two people are required to hold the piles in place, turn the bucket upside down to hold down the wooden piles, and press the wooden piles into the foundation to a certain depth to stabilize themselves. Then let the pile-holding people go away, and the excavator will push down the pine wood piles, usually every 3- A pile can be driven in 5 minutes, which is highly efficient.

In order to achieve a good squeezing effect and improve the bearing capacity of the foundation, piling must be driven from the 4th perimeter of the base to the inner ring. The layout of the piles is preferably in a plum blossom shape, and the distance between piles should not be less than 3 times the pile diameter. After piling is completed, it should be according to the design Saw the pile heads at a high altitude so that the top of each pile is basically at the same level. Remove the silt squeezed out during pile driving, lay a 20-30cm thick graded sand and gravel mattress on the top of the pile and compact it, and then Pour the bottom slab concrete to ensure that the foundation transmits part of the load to the soil between the piles through the cushion layer, and adjust the pipe sharing effect between the piles and the soil.

Setting up a cushion layer under the foundation can reduce the pile-soil stress ratio and give full play to the effect of the soil between the piles, which can increase the value and reduce the stress concentration on the bottom surface of the foundation. By changing the thickness of the cushion layer, the distribution of the pile vertical load can be adjusted The thinner the cushion, the higher the load the piles bear as a percentage of the total load, and vice versa. If there is no cushion, the effect of the soil between the piles cannot be exerted.

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