How is the working efficiency of Trenchless Drilling Machine?

1. Horizontal Directional Drilling Machine
General working efficiency: Under relatively ideal geological conditions, such as soft sand or clay, the drilling speed of the horizontal directional drilling rig is relatively fast, and it can drill about 50 meters to 150 meters per day, and the pull-back speed is relatively slow, generally completing 30 meters to 80 meters of pipeline pull-back per day. If encountering harder geological conditions such as rock formations, the drilling speed will be greatly reduced, and it may only be able to drill 5 meters to 20 meters per day, and the pull-back speed will also be slowed down to about 10 meters to 30 meters.
Influencing factors:
Geological conditions: As mentioned above, the hardness and stability of the formation have a significant impact on the working efficiency of the horizontal directional drilling rig. The drilling and pull-back efficiency of soft formations is high, while hard rock formations will greatly reduce the working efficiency.
Borehole length and depth: The longer the borehole length and the deeper the depth, the greater the resistance and risk encountered by the drill rig during drilling and backhauling, and the work efficiency will also decrease. For example, in long-distance horizontal crossing projects, as the depth and length of the borehole increase, the friction between the drill rod and the hole wall increases, and the difficulty of mud circulation also increases, thus affecting the drilling and backhauling speed.
Pipe diameter size: The larger the pipe diameter, the greater the force required for back expansion and backhauling, and the lower the work efficiency. Large-diameter pipes encounter greater resistance during backhauling, and require a slower backhauling speed to ensure construction quality and safety, which in turn affects the overall work efficiency.
2. Pipe jacking rig
General work efficiency: The construction speed of the pipe jacking rig is relatively slow, and the daily jacking speed is generally around 5 to 15 meters. However, its construction speed is relatively stable and is relatively less affected by geological conditions, but when encountering particularly hard or complex formations, the jacking speed will also decrease.
Influencing factors:
Pipe diameter and pipe section length: The larger the pipe diameter, the heavier the pipe section, the greater the jacking force required for jacking, and the slower the jacking speed. At the same time, the length of the pipe section will also affect the jacking efficiency. Longer pipe sections are easier to maintain straightness during the jacking process, but the difficulty of jacking is also increased accordingly.
Performance of jacking equipment: The performance parameters of jacking equipment such as the type of jacking machine, the jacking force of the jack, and the power of the oil pump directly determine the efficiency of jacking construction. Jacking equipment with excellent performance can provide greater jacking force, so that the pipe section can be pushed into the soil more smoothly and improve work efficiency.
Construction organization and management: Pipe jacking construction requires a series of complex operations in the working pit, such as pipe section lifting, installation, measurement and correction, etc. The level of construction organization and management has a great impact on work efficiency. Reasonable arrangement of construction process and improvement of connection efficiency between each process can effectively improve the overall work efficiency of the jacking drilling rig.
3. Pipe tamping hammer drill
General work efficiency: Pipe tamping hammer drill has a fast construction speed. In short-distance crossing projects, such as crossing roads or railways, it can generally tamp about 3 to 8 meters per hour. However, since its scope of application is mainly the laying of short-distance and small-diameter steel pipes, its overall efficiency in long-distance projects is relatively limited.
Influencing factors:
Steel pipe diameter and wall thickness: The larger the diameter and the thicker the wall thickness of the steel pipe, the greater the impact force required for tamping, and the slower the tamping speed. At the same time, steel pipes with larger diameters and thicker walls will also cause greater disturbance to the formation during tamping, and it may take more time to deal with formation problems, affecting work efficiency.
Structural conditions: Although pipe tamping hammer drills have strong adaptability to formations, the tamping efficiency under different formation conditions is still different. In soft formations, the tamping speed is relatively fast, while in harder formations, a greater impact force is required to advance the steel pipe, and the tamping speed will be correspondingly slowed down.
Pipe tamping hammer performance: The performance parameters of the pipe tamping hammer, such as the impact force, frequency, and connection method with the steel pipe, have an important impact on the tamping efficiency. A pipe tamping hammer with good performance can more effectively transfer the impact force to the steel pipe, thereby improving the tamping speed and construction efficiency.