In recent years, due to the introduction of rotary drilling rigs and the development of domestic models, this type of drilling rig has been widely welcomed by people for its high efficiency and flexibility in clay, sandy soil, and soft rock layers, and is also widely used in highway construction. This article introduces the precautions for drilling holes with rotary drilling rigs
(1) The surface casing must be set up under any circumstances. And the top end of the casing must be at least 30cm above the ground to ensure that the hole is not affected by the external environment.
(2) The surface casing must be reamed with the drill bit if the designed depth is not reached.
(3) During the drilling process, the iron door at the bottom of the bucket must be kept closed at all times to avoid the entry of sand and other debris that may cause mud contamination and deterioration.
(4) During the drilling process, the speed of the drill bucket rising and falling should be determined according to the soil conditions in the hole. Avoid rising and falling at too fast a speed, which will cause water to flow out from the outside of the drill bucket and wash the hole wall. It is very easy to cause the hole wall to collapse and create a dangerous situation, affecting the drilling construction.
(5) During the drilling process, the number of revolutions of the drill bucket should be set according to the resistance of the borehole and other considerations.
(6) The drill bucket should be lifted slowly to avoid the suction of the drill bucket causing the pile end bearing layer to loosen. When drilling in the pile end bearing layer, if the pile end bearing layer is tilted, in order to prevent the drill bucket from tilting, a slight pressure should be applied during drilling.
(7) After drilling, the hole wall has no support, so the water level in the hole should be higher than the groundwater level by more than 2m to avoid collapse.
(8) Ensure the verticality of the drill rod, which is an important basis for ensuring the verticality of the hole.
During the drilling process, ensure that the drill rig is vertical and that the drill rod is always vertical to the ground during the drilling process. Before the formal drilling, the verticality of the drill rig and drill rod should be calibrated according to the construction standard requirements.
After the calibration is completed, the drill rig should be fixed. In addition, during the drilling process, attention should be paid to the control of verticality, and the supervision of drilling construction should be strengthened. If problems such as drill rod vibration or loose joints are found, they should be adjusted in time to avoid affecting the verticality of the hole, and at the same time, problems such as hole deviation can be effectively avoided.
(9) The drill bit should be selected reasonably. The selection of the drill bit is also the key to the application of rotary drilling construction technology. Therefore, the drill bit should be selected reasonably. The selection of the drill bit should be based on the soil quality, and the appropriate drill bit should be selected in combination with the soil quality. In addition, attention should be paid to the control of the drill bit speed. The control of the drill bit speed needs to be based on the geological conditions. Different speeds should be selected for different geological conditions.
Only by ensuring that the drill bit is selected reasonably and the speed control is scientific can the construction effect be ensured. This not only affects the efficiency and quality of drilling construction but also helps to improve the environmental protection and energy-saving effect of drilling construction. Therefore, it should be given high attention.
In addition, during the drilling process, attention should be paid to controlling the lifting speed of the drill bit. Reasonable lifting speed is the key to ensuring the quality of drilling construction. If the drill bit is raised and lowered too slowly, it will not only greatly affect the efficiency of drilling construction, but also cause a large amount of mechanical energy waste, which is not conducive to energy conservation and environmental protection of construction.
If the drill bit is raised and lowered too quickly, it is easy to cause accidents such as hole collapse. It can be seen that during construction, attention should be paid to controlling the raising and lowering speed of the drill bit.
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