A method of crossing river and laying cables by using horizontal directional drilling technology

Abstract

The invention discloses a method for crossing a river channel and laying a cable by using horizontal directional drilling technology. The steps include: S1: Calculate the top elevation of the first steel pipe according to the minimum navigable water level, the water depth of the planned channel, the thickness of the river bed, the elevation of the bottom of the river bed, and the pre-embedded depth. and the top elevation of the second steel pipe, select the minimum value between the two as the minimum value of the actual steel pipe top elevation; S2: Select the steel pipe for laying cables and its quantity, the MPP pipe built in the steel pipe and its quantity, according to the actual steel pipe top The minimum value of the elevation, the radius of curvature of the steel pipe, the penetration of the steel pipe through the stratum, the entry point and the exit point of the horizontal directional drilling determine the crossing route of the horizontal directional drilling; S3: Calculate the traction force and lateral pressure during cable laying according to the crossing route, and judge whether it meets the requirements of construction Requirements; S4: Use horizontal directional drilling to form pilot holes in the river channel, drag steel pipes back and pass through MPP pipes, lay cables, and use steel pipes to cross the river to complete the laying of cables between substations on both sides of the river after accurate parameter calculation. The project cost is low. The construction period is short and the implementation is difficult and 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...

AI Technical Summary

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 the river is called underwater laying. The trench excavation at the bottom, the construction process is long and requires a lot of manpower and material resources

Images