[Engineering Version] Daily Question 20180623

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The following statements about the axis control pile method are correct (    ).       A. The elevation can be controlled. B. The position of the axis can be controlled. C. Compared to the gantry board method, mechanical construction tends to cause damage to it. D. The pile positions are generally located at least 4 meters away from the edge of the excavation area. E. The axis can be marked relative to nearby buildings. Answer: BDE 【Explanation】Axis control pile method: The gantry board method requires a large amount of space and uses many materials; it is also prone to damage during construction. Therefore, the axis control pile method is generally used in current projects. Axis control piles are generally installed on the extension line of the axis, 4 meters away from the excavation boundary, and are firmly buried underground. Alternatively, the axis can be projected onto adjacent buildings or structures and marked accordingly as a substitute for axis control piles.