1, the determination of final pressure standard should be based on factors such as trial piling, pile tip entering bearing stratum, piling pressure, etc., combined with the piling experience of adjacent projects, and agreed by relevant units such as survey, design, construction and supervision.
2. When the pipe pile is pressed into the soil to a certain depth, or when the pile tip enters the bearing stratum to a certain depth, the pile pressing can be stopped to meet the design requirements, taking the final pile pressing force as a reference.
3. Static pressure pile sinking method should be adopted for trial pile sinking, and 2 ~ 3 piles should be constructed at representative foundation positions first. If the pile pressing force is still small after entering the design elevation, it should be recompressed with the pile pressing force equal to the design ultimate bearing capacity of the pile after 24 hours. If the pile body is stable, construction can be carried out according to the pile length and elevation of the test pile, otherwise it should be adjusted appropriately. The pile pressing force can be determined according to the data of pile test and the requirement of pile tip entering the bearing stratum.
4. The pile end reaches hard, hard plastic cohesive soil, and the designed bearing layer, such as silt, sandy soil, completely weathered rock and weathered rock with medium density or above, shall be subject to the final pile pressing force.
5. The upper pile body is located in thick saturated soft soil. During pile sinking and pile delivery, the lifting pile frame should not be used as the standard to control the final stop of pile pressing, so as to prevent the pile body from instability, fracture or cracking during lifting. The final pile pressing force should be controlled by the working pressure of the pressure sensor installed on the pile frame or the oil pressure gauge on the pile machine (through the pressure conversion relationship).
The above is the introduction of the final pressure standard of static pressure pile sinking provided by Zhong Da Consulting for construction personnel. For more knowledge of architectural terminology, please pay attention to the architectural knowledge column of Zhong Da Consulting.
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