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G219线新藏公路改建整治工程第四合同段项目路线所处区域属青藏高原,这里人烟稀少,空气稀薄,属于季节性冻土及高海拔多年冻土,相对于钻孔灌注桩,人工挖孔桩有之其独特的有利因素,它具有设备简单、作业面易于开展、施工效率高、质量容易保证等优点,因而在当今诸多钻孔灌注桩受限制的地方人工挖孔桩得到了广泛应用。依据人工挖孔桩的特点,从施工前的准备、挖孔、钢筋笼、浇筑混凝土及成桩等几个方面阐述人工挖孔桩在施工中的具体应用,并提出相应的质量控制和安全措施。
G219 Line Reconstruction Project of Xinzang Highway Reconstruction Project The fourth contract section of the project belongs to the Qinghai-Tibet Plateau, where is sparsely populated and of thin air. It belongs to seasonal frozen soil and permafrost at high altitude. Compared with bored pile, With its unique advantages, it has the advantages of simple equipment, easy operation of the working surface, high construction efficiency and easy quality assurance. Therefore, artificial digging pile has been widely used in many places where many bored piles are limited. According to the characteristics of manual digging piles, the concrete application of manual digging piles in construction from several aspects such as preparation, digging holes, steel cage, pouring concrete and piling before construction, and put forward corresponding quality control and safety measures .