The horizontal directional drilling crossing pipe laying method is the mainstream method in the current trenchless pipe laying technology method. This process method generally goes through three stages: one is the construction of the guide hole, the second is the first or multi-stage pre-expansion, and the third is the finished pipe pulling back. It can be said that after the guide hole is completed, the expansion is a very critical and labor-intensive process. The roller reamer is a necessary tool for expansion, and the key to expansion is to select an efficient and safe reamer according to the actual conditions. The strata to be crossed are complex and changeable. There are not only clay layers and sand layers, but also quicksand layers and even rock layers. For non-rock layers, ordinary reamer (such as plate reamer, barrel reamer, flow channel reamer) can do the job. In the past, rock layers were a restricted area for horizontal directional crossing construction, because ordinary reamers were powerless against rock layers. With the increasing advancement of science and technology, rock reamers have been successfully developed at home and abroad.
Structure:
Rock reamer can be divided into two categories: roller reamer and cone type according to different structural forms. The roller cutter type is only suitable for soft rock to medium hard rock, not for hard rock, and is not convenient for reverse withdrawal. The roller cutter type has high strength, good wear resistance, long service life, good safety, and is suitable for various rock formations, especially for reaming operations of long-distance rock formations. It is also convenient for reverse withdrawal. Therefore, we chose the roller cutter rock reamer as the object of research.
The Significance Of Developing The Roller Cutter Rock Reamer:
(1) At present, the workload of rock formation crossing in domestic horizontal directional drilling is increasing.
(2) Having a high-quality roller reamer can enhance the strength of horizontal directional crossing and have a place in the fierce market competition.
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