How should we deal with the abnormal encountered during the construction of rotary drilling and drilling?
When the hole is not serious, the drilling can be continued by adopting the measures of increasing the specific gravity of the mud, heightening the water head and burying the deep protecting cylinder. When the hole is serious, the backfill will be drilled again.When drilling and bending holes occur in the drilling hole, the drill bit of the rotary drill can be raised to the inclined position for repeated hole sweeping until the drilling is upright. In the event of serious bending hole, plum blossom hole, probe stone, the small stone or gravel and clay mixture backfill to deflection, to be heavy filler after re drilling deviation.When drilling, it is not strong lifting. The cause and location of the bit shall be ascertained, and large ropes shall be moved, small bit impact shall be taken, and other measures taken to make the drill loose and brought up.
Is a rotary drill hole construction process operation for building foundation engineering. Widely used in construction engineering to municipal infrastructure construction, highway bridges and high-rise buildings, with different tools, suitable for dry or wet (short spiral), (bucket) and rock (Yan Xinzuan) of the drilling operation, with large installed power, large output torque, axial pressure, flexible rotary drilling rig, high construction efficiency and function characteristics. To adapt to the soil geological conditions in most parts of the rotary drilling rig, the use of a wide range, can basically meet the needs of bridge construction, the use of high-rise building foundation engineering. At present, has been widely applied to various rotary drilling bored piles. Therefore, it is of great significance to make a technical discussion on the construction of the rotary drilling rig and the construction techniques of the commonly used clean water. During the construction, according to different geological conditions of soil, according to the following provisions: the choice of different bit short screw drill, suitable for underground water level above the clay, silt, soil, sand, medium dense above weathered rock. Core auger bit is suitable for crushed stone soil, medium hardness rock and weathered rock formation. Core rotary bucket, applicable to weathered rock and cracked rock.
When drilling occurs, the situation should be dealt with as soon as possible. No entry of personnel into the drilling hole without protective canister or other protection measures. Must enter the protective measures of drilling, should be confirmed that no harmful gas in the drilling hole, and equipped with anti-virus, anti drowning, buried, and other security measures to ensure access to, and set up a special person responsible for on-site command. For the special geological conditions encountered boulder and dissection in the drilling process, the rotary drilling encountered a sandwich, if we can continue to slow down the drilling speed and drilling requirements, prolong drilling time, increase the proportion of mud was used by. When drilling is stopped for some reasons, sufficient water level and relative density and viscosity of the slurry should be kept in the hole, and the drill bit must be taken out of the hole when dealing with the accident in the hole.
When drilling and bending holes occur in the drilling hole, the drill bit of the rotary drill can be raised to the inclined position for repeated hole sweeping until the drilling is upright. In the event of serious bending hole, plum blossom hole, probe stone, the small stone or gravel and clay mixture backfill to deflection, to be heavy filler after re drilling deviation. When the hole is not serious, the drilling can be continued by adopting the measures of increasing the specific gravity of the mud, heightening the water head and burying the deep protecting cylinder. When the hole is serious, the backfill will be drilled again. When drilling, it is not strong lifting. The cause and location of the bit shall be ascertained, and large ropes shall be moved, small bit impact shall be taken, and other measures taken to make the drill loose and brought up.
