The main factors affecting the quotation of Horizontal Directional Drilling Machine

1. Directional drilling crossing length and pipe diameter

So far, the longest length traversed by directional drilling is the Hangzhou-Ningbo natural gas pipeline Qiantang River crossing project, with a pipe diameter of 813mm and a crossing length of 2454.15m. The largest pipe diameter crossed is the main channel crossing project of the Weihe River in the east section of the West Second Line, with a pipe diameter of 1219mm and a crossing length of 1240m. The selection of directional drilling crossing length and pipe diameter is directly related to the type of drilling rig used for crossing, and the excavation and backfilling of sending trenches crossing prefabricated pipe sections.

2. The geological conditions of the crossing area

The geology suitable for Horizontal Directional Drilling Machine construction mainly includes three types of geology: Class I soil includes clay layer, sub-clay layer and fine soil layer; Class II soil refers to clay layer, medium-coarse sand layer, sand layer and fine sand layer on the surface layer, clay clay layer and sub-clay layer in the middle, coarse sand layer, gravel layer with gravel diameter less than 30mm and content of 20%; Class III soil refers to rock layer and sandstone layer with hardness below 30MPa. The geological conditions directly affect the success or failure of the construction. The common problems in the construction process of the Horizontal Directional Drilling Machine are that it is difficult to form a hole and control the direction, and it is prone to hole wall collapse, drill sticking, drill pipe breakage, and even back-dripping pipe sections and drilling tools stuck in the hole. internal condition. Therefore, when quoting the Horizontal Directional Drilling Machine, especially the long-distance large-diameter pipe crossing project, it is necessary to carefully analyze the geological conditions and formulate a reasonable construction plan to reduce the risk of quotation.