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When the piercing to a depth of 27 m, 28m near 29.04 m design depth then appear the phenomenon as follows: machine stop, and restart the system continuously, vibrating piercing not add anymore because the ground is too hard. Curved-walled pipes can lead to cracked to a broken pipe, tube head squeezed tend hượng slipping on the horizontal plane below the pressure effects of vibrating makes the tilt of the tube wall, cannot be guaranteed.
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