Chinese fir is a timber tree species that is widely cultivated in the Yangtze River Basin and south of the Qinling Mountains in my country, grows quickly, and has high economic value. The cultivation area starts from the southern slope of the Qinling Mountains in the west, Tongbai Mountain in Henan, Dabie Mountain in Anhui, Jurong and Yixing in Jiangsu in the north, and Jurong and Yixing in Jiangsu in the south. Xinyi of Guangdong, Yulin of Guangxi, Jinlong of Yunnan, Guangnan of Yunnan, south to Malipo, Pingbian, Kunming, Huize, Dali, east to Zhejiang, northern and western mountainous areas of Fujian, west to Sichuan Dadu River Basin and southwest Anning river basin.

The upper limit of vertical distribution often changes with different terrain and climatic conditions. The Dabie Mountains in the east are below 700 meters above sea level, Daiyun in Fujian is below 1000 meters above sea level, Mount Emei in Sichuan is below 1800 meters above sea level, and Dali in Yunnan is below 2500 meters above sea level.

Under normal circumstances, before the river piling project, the engineer will design the distance between two adjacent pine piles during construction, and will also give the corresponding pine pile size. The project manager only needs to purchase according to the requirements given in the design plan. That's it, but some designs sometimes don't have specifications for pine piles, so we can choose pine piles with a diameter of about 100MM and L=6 m.

The first is the issue of verticality. When using fir piles as river piles, the verticality is good, so the effect is remarkable. During construction, care must be taken to ensure the verticality of fir piles, otherwise their service life will be greatly reduced.

Secondly, the order of pile pressing is a problem. If the pile pressed first is skewed, it will make the fir tree piles behind it even more skewed, causing the fir tree pile equipment to fail. When digging pile holes, you should also pay attention to the consistency of the pile holes, and do not let the pile holes affect the quality of the fir piles. vertical shape.