Defects in the Construction Quality of the Bored Cast-in-Place Piles and the Treatment Method

Nowadays, in the civil engineering industry, the concrete bored cast-in-place piles, because of the characteristics of the easy construction, the low costs, and the wide applicability and so on, have become the most commonly used form of the piles in the construction industry. But the bored cast-in-place piles belong to the concealed engineering, the forming process of the piles is in the underground beyond the sights. And the craft of the construction of the bored cast-in-place piles is complex, with various procedures, and the qualities of the construction personnel are uneven, and the advanced degrees of the construction equipment are different, and therefore, the pile foundations are prone to have the quality defects. In the engineering, there are the necking down, the tube diameter expansion, the wall collapse of the hole, the bottom deposition of the hole, the honeycomb, the intercalated mud, the broken pile, the short pile, the clip mud, and the segregation and other quality defects, resulting in the reduction of the bearing capacity of the pile foundation, which will affect the safety of the engineering structures. In this paper, aiming at the different piles with the quality defects, we should analyze the causes of the defects, and then take the appropriate measures to carry out the prevention and treatment according to the local conditions. Since the entering of the new century, along with the rapid development of the industry of the civil engineering construction in China, in the large construction projects, the wide application of the pile foundation has become a very important form of the foundation in the civil engineering construction in our country. And in all the types of the pile foundation, the bored Cast-in-place pile is used most widely. In the fine words, the bored cast-in-place pile is most widely used in the engineering. How the construction units of the pile foundation carry out the construction to ensure the quality is the formation of the project entities, and is also the critical stage to determine the quality of the building products. To improve the quality of the pile foundation engineering, we must strictly control the quality of the construction, actively study the processes and the ways of the quality control in the construction of the pile foundation, and prevent the accidents as early as possible, so as to lay a solid foundation for the reliable quality of the whole project.