What should be paid attention to when driving piles on steel rod foundation: 1. Pop out the middle line and size line on the miniature steel pipe pile, so as to control the driving depth; 2.Be prepared to have full lifting capacity of lifting equipment;Offshore operations use instruments to determine the position of piling from both directions.
Second, the order of piling.Due to pile driving, the soil will be compacted. For soft soil, the lateral or upward flow and gushing of soil will be caused by the sharp increase of pore water pressure caused by pile driving. Therefore, the order of pile driving should be adjusted according to the situation.
For driving closed mouth pile or cloth pile is too dense, when the central part is pushed behind, the central foundation will be crowded, which will make it difficult to enter the pile, and at the same time, the surrounding pile will be subjected to harmful bending stress, in order to solve this situation should be from the center to the surrounding or one side of the drive, parallel.Also may use the construction method in the form of excavation (suitable for auger etc.).
Three, piling essentials.Before formal driving, it is necessary to make a predrive, and then drive formally after determining the central position and Angle of the pile.If the pile is inclined and the inclination Angle is large, if the pile is driven quickly, the center of gravity of the pile driving frame will move violently. Therefore, it is necessary to start to play lightly.If the pile cap is inclined at the depth of 2-3m, it should be taken out for correction or pulled out and struck again.
4. Pile extension.In addition to the pile extension height that makes the pile extension easy to be in place, the remaining height of the lower section pile is generally the best 50-80cm in order to facilitate welding operations.
