Method for crossing riverway and laying cables by using horizontal directional drilling technology

Abstract

The invention discloses a method for crossing a riverway and laying cables by using a horizontal directional drilling technology. The method comprises the following steps: S1, calculating a top elevation of a first steel pipe and the top elevation of a second steel pipe according to the lowest navigation water level, a planned channel water depth, riverbed undercutting thickness, a riverbed bottomelevation and a pre-buried depth, and selecting the minimum value between the two values as the minimum value of the actual steel pipe top elevation; S2, selecting steel pipes for laying cables, thenumber of the steel pipes, MPP pipes arranged in the steel pipes and the number of the MPP pipes, and determining a crossing route of the horizontal directional drill according to the minimum value ofthe actual top elevation of the steel pipes, a curvature radius of the steel pipes, a steel pipe crossing stratum, and a buried point and an unearthed point of the horizontal directional drill; S3, calculating a traction force and side pressure during cable laying according to the crossing route, and judging whether the traction force and the side pressure meet construction requirements or not; and S4, forming a guide hole in the riverway by using the horizontal directional drill, dragging back the steel pipes, penetrating the MPP pipes and laying the cables, and penetrating the riverway by using the steel pipes after accurate parameter calculation to complete laying of the cables between the transformer substations on the two banks of the riverway. Engineering cost is low, a constructionperiod is short and implementation difficulty is easy.

Description

technical field [0001] The invention relates to the field of cable laying, more specifically, to a method for crossing a river channel and laying cables by using horizontal directional drilling technology. Background technique [0002] Horizontal directional drilling rig is a construction machine for laying various underground utilities (pipes, cables, etc.) without excavating the ground surface. In paving construction, it is suitable for sandy soil, clay, and other ground conditions, and it can be constructed in most non-hard rock areas in my country if the groundwater level is high and the pebble stratum is not suitable. The working environment temperature is -15℃~+45℃. Horizontal directional drilling technology is a new construction technology that combines directional drilling technology in the petroleum industry with traditional pipeline construction methods. It has the advantages of fast construction speed, high construction precision, and low cost. It is widely used i...

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Problems solved by technology

[0003] In urban cable laying projects, sometimes there are substations on both sides of the river and the cable must be laid across the river. Laying cables in t

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