1, custom vermeer drive chuck construction principle: Drilling guide hole is the use of directional drilling equipment at the entrance to start directional drilling, drilling process through monitoring and control means to make the drilling according to the design track extension. And from the other end drilled out of the surface to complete the construction of the guide hole. If the pipeline to be installed by the drilling rig is large and cannot complete the reaming and backhauling operations at the same time, the reaming shall be carried out step by step, and the diameter of each reaming shall be determined according to the equipment capability, formation conditions, and site conditions. Generally, pull back reaming can be used. Pipeline backhauling means that the directional drilling rig connects the pipeline to the drill pipe through the pullback head and the reaming drill bit and the transfer case at the exit, and uses the drilling equipment to turn and pull back, while conveying the washing liquid to the drill bit through the drill pipe, and the reaming backhauling process is continuous. No long non-work pauses are allowed in the middle.

2, directional drilling technology is an advanced technology developed from the field of oil drilling, is the use of rock drilling, directional drilling measurement and control and other technical means, in the case of surface excavation and formation structure damage is minimal, such as water supply, gas, natural gas, sewage, telecommunications cables and other public pipelines laying construction technology. Directional drilling machine is suitable for a wide range of applications, can use the bottom of the hole motor or rigid drill pipe to drive the drill bit to turn into a hole, in hard rock or pebble layer can also be constructed.

3. Precautions: First of all, according to the geological conditions through, choose the appropriate drill bit and guide plate or underground mud motor, start the mud pump aligned with the soil point for drilling, directional drilling construction, the drill bit in the thrust of the drill driven by the rotary cutting formation, constantly moving forward, after each drilling to measure the position, in order to adjust the drilling direction in time. Ensure that the completed drilling guide curve meets the requirements of the design, so repeated operation until the drilling is completed, so as to avoid the problem of the machine's efficiency due to the position of the drill bit deviation. Under normal circumstances, when using a small drill, when the straight diameter is greater than 200 mm, it is necessary to carry out pre-reaming, when using a drill, when the product pipeline diameter is greater than 350mm, it is necessary to carry out pre-reaming, the scope and number of pre-reaming, depending on the drill model and geological conditions. This use of horizontal directional drilling reduces resistance and protects the pipeline's anticorrosive layer. The cost of construction is saved, and the working efficiency of the machine is improved.

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