According to different piling methods, it can be divided into manual piling and mechanical piling. Commonly used piling machines include hand windlass and diesel piling machine. Hydraulic excavators are mostly used for piling. When piling with a hydraulic excavator, two people hold the pile. position, the tipping bucket buckles the pile upside down and presses the pile into the foundation to stabilize itself at a certain depth. Then let the pile supporter go away and the excavator presses down the pine pile. Generally, the pile can be driven every 35 minutes, and the work efficiency is high. In order to To achieve good compaction results and improve the bearing capacity of the foundation, piles must be driven from the periphery of the foundation to the inner ring. The arrangement of the piles should be in a plum blossom shape, and the distance between piles should not be less than 3 times the pile diameter. After driving the piles, the pile heads should be cut according to the designed elevation. Level, so that the top of each pile is basically kept on the same level. The mud squeezed out during the piling process should be excavated, and a 20-30cm thick graded sand cushion should be laid on the top of the pile and compacted, and then concrete should be poured on the bottom plate. , to ensure that the foundation transfers part of the load to the soil between piles through the cushion, and adjusts the pile-soil sharing effect. Setting a cushion under the foundation can reduce the pile-soil stress ratio, play the role of the soil between piles, increase the value, and reduce the stress ratio of the foundation. Stress concentration at the bottom. By changing the thickness of the cushion, the thinner the cushion, the higher the load the piles bear as a percentage of the total load, and vice versa. Without the cushion, the soil between the piles cannot be used.

Pine stakes are made of pine wood and are mainly used for treating soft foundations and river banks. Please note when using:

1. Pine stakes are made of "logs" and should not be cut into other shapes. In particular, they cannot be cut in half to become semicircles. Semicircular stakes will quickly bend strongly and lose their effectiveness.

2. The design method of pine pile composite foundation is similar to that of ordinary composite foundation, except that the distance between piles is often very small.

3. It is necessary to consider the pile driving impact force that the pine pile can withstand. The pile driving impact energy is within 300kg\/m; even a log with a tail diameter of 16cm cannot withstand it no matter how large it is.

4. The horizontal resistance of the foundation soil in the silt area is very small, and the upper ends of the pine pile groups are prone to overall horizontal displacement, damaging the ground facilities; therefore, even if the horizontal load of the earthquake is not considered, a layer of stone must be laid between the pine piles as much as possible. It is possible to increase the level of the pile group. The stone layer can only be laid manually, and try to squeeze the pine piles one by one.