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Brand Name:	TOP
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Product Info:Trenchless pipeline construction, pipeline deformation preventive measures:
(1) using extrusion expansion type reaming drill, reamer drill on the cutting blade to the soil cutting into powder.
(2) when the reaming if encounter obstacles to guide hole, avoid the obstacles and ensure the reaming reaming bits do not contact with its.
(3) not using the czochralski method of black hole, hole cleaning by reaming drill rotary method, reaming drill bit rotation continuous pumping drilling fluid.
(4) after enlarge the hole if stop for a long time, must be effectively before drawn tube hole cleaning.
(5) the use of wall thickness material of plastic pipe.