usepine wood pileSome issues to note:
1,pine wood pileIt is made of "logs" and should not be sawn into other shapes, especially not cut in half to form a semicircle. Semicircular piles will quickly become strongly bent and lose their effectiveness.
2. Do not promote "pine piles" as "cedar piles" or other piles. Most common woods are resistant to water and will quickly turn black, deformed and rotten in water. This is especially true for fir wood, which must not be used. Of course, it is also Some other woods can also be "soaked in water for thousands of years", such as mahogany.
3,pine wood pileThe design method of composite foundation is similar to that of ordinary composite foundation, except that the pile center distance is often very small.
4. It is necessary to consider the impact force of pile sinking that pine piles can withstand. The impact force of pile sinking is within 300kg.m; no matter how large it is, even logs with a tail diameter of 16cm cannot withstand it.
5. The horizontal resistance of foundation soil in silt areas is very small, and the upper ends of the pine pile groups are prone to overall horizontal displacement, causing damage to ground facilities. Therefore, even if the need for earthquake horizontal loads is not considered, most of the time a stone layer is laid between the pine piles as much as possible. Improve the horizontal stiffness of the pile group. The stone layer can only be laid manually, and the pine piles should be squeezed one by one as much as possible.

According to different methods of piling, it can be divided into manual piling and mechanical piling.
Commonly used pile driving machines include hand winches and diesel pile drivers. Hydraulic excavators are also often used to drive wooden piles. When using a hydraulic excavator to drive piles, two people are required to hold the piles in place, turn the bucket upside down, and press the wooden piles. Press the foundation into the foundation to a certain depth to stabilize it, then let the pile helper go away, and the excavator will press down the pine piles. Generally, one pile can be driven every 3-5 minutes, which is more efficient.
In order to achieve a good squeezing effect and improve the bearing capacity of the foundation, piles must be driven from the 4th perimeter of the base to the inner ring. The arrangement of 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, the pile heads should be sawn flat according to the designed elevation so that the pile tops of each pile are basically kept at the same level. The silt squeezed out during pile driving should be excavated, and a 20-30cm thick graded sand and gravel mattress should be laid on top of the piles. It is compacted, and then the bottom slab concrete is poured to ensure that the foundation transmits part of the load to the soil between the piles through the cushion layer and adjusts the sharing effect between the piles and the soil.
Setting up a mattress layer under the foundation can reduce the pile-soil stress ratio and give full play to the role 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 mattress layer, the vertical load-sharing mattress of the piles 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 soil between the piles cannot play a role.