1. The construction efficiency is low, mainly due to the high time of lifting the drilling tool and the low efficiency of the drill pipe to transfer the drilling pressure.
the way to deal with a situation:
(1) Increase the length of the drill bit to increase the amount of ballast per drill;
(2) The drill bit is equipped with a vent to lift the drilling speed;
(3) If not into the rock, try to use the friction bar, so as to save the unlock time.
2. The failure rate of the drill pipe rises sharply. After the lengthening of the drill pipe, the slender ratio of the drill pipe is particularly unreasonable, and the construction should bear large torque and pressure, especially the machine lock pipe is frequently unlocked on the ground, so the failure rate of the drill pipe will rise sharply.
the way to deal with a situation:
(1) The working site should be smooth and firm as far as possible to reduce the swing of the drilling rig;
(2) Correct the leveling system regularly to make the drill pipe work vertically;
(3) It is strictly prohibited to jacking the rig during pressurized drilling;
(4) Add a centralizer to the drill pipe.
3. The pile hole deviation, the main reason is the uneven hardness and hardness of the formation, the overall steel reduction after the lengthening of the drill rod, and the cumulative gap of the drill tool after the length of the drill tool.
the way to deal with a situation:
(1) Increase the height of the drilling tools;
(2) Add a holrighizer ring to the drill rod;
(3) Add a counterweight device to the upper part of the drill bit, and use the pressure on the hole bottom, so that the drilling tool has a self-supporting function when drilling.
4. Frequent accidents in the hole, mainly reflected in the unstable collapse of the hole wall.
the way to deal with a situation:
(1) Due to the longer construction time of deep pile, if the wall protection effect is not good, the hole wall will be unstable, and high-quality mud should be prepared;
(2) The drill bit has a vent to reduce the impact and suction on the hole wall when drilling.
Post time: Mar-15-2024