Main technical parameters and performance of the equipment
The impact frequency of the reverse circulation drilling rig is 40 times/min, the lifting capacity of the main and auxiliary winches is 30kN, the motor power is 45kW, and the reverse circulation 6BS pump is not included. The weight of the impact drill bit is 4t, and the drill bit is cast as a whole, with impact resistance, large impact volume and high drilling efficiency. It is suitable for reverse circulation impacting piles with a diameter of 800-1500mm. CJF-20 type impact reverse circulation drilling rig. The lifting capacity of the main and auxiliary hoists is 50kN, the maximum drilling rig diameter is 2.0m, the drilling depth is 80m, the hoisting stroke is 1.5-3.0m, the impact frequency is 46 times/min, the main machine power is 75kW, and the reverse circulation pump set is 3PNL and 6BS pumps can be matched Hydraulic walking vertical and horizontal displacement, the drill bit is welded with steel plates over 50mm except the impact tip which is wear-resistant material. It can also be equipped with drill bits of various specifications. This series of impact reverse circulation drilling rigs is suitable for pebble, gravel, cemented eggs It is widely used in the construction of complex foundation engineering such as gravel and rock socket, and is widely used in bridge bored piles and underground diaphragm wall foundation engineering.
Construction Technology
The crushing mechanism of the impact reverse circulation breaking into the rock process is to use the impact drill to impact the rock with a high frequency to break the rock, and then use the reverse circulation slag discharge method to promptly discharge the broken debris out of the hole. The impact drill is balanced by two steel ropes, so it is very convenient to start or lower the drill, which greatly shortens the auxiliary time.
Therefore, the percussion reverse circulation bit is the main tool for percussion drilling, and the rationality of its structure directly affects the drilling efficiency and quality. In the process of percussion drilling, the key is whether the impact and slag absorption are matched, and it is also the most basic and most important condition to ensure the stable and normal drilling of the hole wall. During the drilling process, the slag suction work should be determined according to the drilling stratum and conditions. Buried drilling accident occurred. In addition, during the impact process, the wear of the wire rope and the flexibility of the steering device and the firmness of the connection must be checked frequently to prevent the wire rope from being broken or twisted due to ineffective steering, resulting in a drill drop accident.
According to the geological conditions, the drill bit output should be checked frequently when lifting the abrasive material. Generally, the drill should be checked at least once in each sub-class. The number of drill bit lifting in complex formations should be increased, and the bottom volume and the output volume of the drill bit are often worn in the sand, pebbles and bedrock. It is serious, so it should be repaired in time, which increases the paving time for repairing the drill bit, reduces the pure drilling impact time, and reduces the auxiliary time for repairing the drill bit. When approaching the bottom of the protective tube, slowly lift the drill bit to prevent collision with the orifice protective tube, so as to avoid the collapse of the bottom of the protective tube or the dislocation or deformation of the protective tube.
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