1. Since horizontal directional drilling construction is a new production process technology, there is no uniform technical standard and construction acceptance code in my country, resulting in no official basis for engineering design and construction quality control. Once a quality accident occurs, the identification of the responsible party also causes certain difficulties.
2. Due to the use of directional reaming and towing, at the end of the construction, the gap between the pipe and the reaming hole can not be treated by backfilling and tamping like slotting and laying facilities. Therefore, there is a certain risk in the actual use of projects that require high pipe settlement.
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