What is the reason for the fracture of the drill pipe of the horizontal directional drilling rig？

1. From a macro perspective, the reasons for the cracking of the drill pipe of the horizontal directional drilling rig mainly include the following aspects:

1. Raw material and processing of drill pipe

1. For drill pipe raw materials, users should not only consider the low price, but also distinguish the amount of pipe raw materials. Customers should purchase standard products from official manufacturers that are produced in strict accordance with international and national standards, so that the quality of the most fundamental steel can be guaranteed.

2. The processing quality mainly refers to the processing specification, processing button type, processing quality, processing accuracy and so on of connecting threaded buttons.

3. Whether the heat treatment process, quenching and tempering and hardening treatment meet the rules and requirements.

2. Problems in horizontal directional drilling rig engineering:

1. The non-excavation drill pipe has been used for too long, the surface is damaged more, and it is close to or exceeds the fatigue life, so replace it with a new drill pipe in time.

2. The radius of curvature of the construction hole exceeds the small radius of curvature of the drill pipe to control the small radius of curvature of the construction hole.

3. Severe scratches on the surface of the drill pipe body (more than 1 mm in depth and in a spiral shape) avoid using drill pipes with scratches.

4. The torque of the horizontal directional drilling machine is greater than the torque accepted by the inclination angle of the drill pipe. Equip the drilling rig with suitable drill pipe.

3. Matters needing attention in the construction of horizontal directional drilling rig:

Before the first operation of the horizontal directional drilling rig, you should read the manufacturer's instructions provided to make the layout, performance and purpose of the main components clear. It is necessary to carefully check the large cutter head with large oil in the reducer, the reducer oil and gears of the screw machine Box gear oil, and add lubricating oil in strict accordance with the specifications and models required by the manual, and replace it regularly.

When the horizontal directional drilling rig is measuring and setting out, the position of the pile should be controlled according to the data given by the design. When setting the line stakes of the pipe jacking machine, the center line should be released, and it should be marked after the setting is completed. For the laying of the construction line, the exact position and size of the sending and receiving pits should be carefully checked.

After the horizontal directional drilling rig arrives at the construction site, the hydraulic oil in the oil tank should be checked first. If the hydraulic oil is not enough, use an electric oil filter to refuel, and add it to the specified scale as required. After refueling, the hydraulic oil in the oil tank needs to be filtered repeatedly through the oil filter. Generally, the filtering time of hydraulic oil in the whole oil tank should not be less than 24 hours. In addition, after each section of pipeline is completed, a minimum of 12 hours of circulating filtration of the hydraulic oil tank is also required.