The use of spun concrete piles under geological layer that has the thick soft soil layer reveals many flaws, many incidents of tilting pile or broken pile have occurred during construction process in many projects, cause great damage to the cost of the project as well as the slow construction progress. In this paper, the author analyzes the causes inclined piles during construction of spun concrete piles, as well as provide the method to determine the inclination of the pile along the pile body. | PROBLEMS OF SPUN CONCRETE PILES CONSTRUCTED IN SOFT SOIL IN HCMC AND MEKONG DELTA VIETNAM Nguyen Thanh Trung Civil Engineering Faculty Ho Chi Minh City University of Technology HUTECH ABSTRACT In recent years the use of spun concrete piles for foundation of high buildings in HCMC and provinces in Mekong Delta is popular. Because of the advantage that the length of each segments of pile is longer the number of joints is reduced as well as load bearing capacity under material strength is greater and total cost is reduced for the Client. However the use of spun concrete piles under geological layer that has the thick soft soil layer reveals many flaws many incidents of tilting pile or broken pile have occurred during construction process in many projects cause great damage to the cost of the project as well as the slow construction progress. In this paper the author analyzes the causes inclined piles during construction of spun concrete piles as well as provide the method to determine the inclination of the pile along the pile body. Keywords Incident inclinometer soft soil spun concrete pile tripot. 1. INCIDENT OF PILE INCLINATION Figure 1. Photos of pile tilt at project in District 2 HCMC During the construction process in order to shorten the construction period contractor often uses Robot compressor which is 600 tons and 900 tons of Robot weight and compressing load. During the pile construction process the robot will apply the load and move above between the pile positions. With such heavy loads Robot even moves on the thick sand layer around to 2m there is still able to create the sliding surface causing the tilt of the previous pre-constructed piles. 472 Figure 2. The appearance of sliding surface during pressing Apart from the case of the piles are inclined due to the appearance of sliding surface during the pile pressing construction there are also some reasons cause the pile inclination as follows Piles are inclined during deflected pile pressing .
