Patent ID: 8939678
Filing Date: 2015-01-27
Classification: E02F,F16L

Abstract:
1. A method of laying underwater pipelines in a bed of a body of water, the method comprising the steps of: laying an underwater pipeline along a given path on the bed of the body of water; breaking up a ground mass in the bed along said path by using two ground-working tools; and fluidifying the broken ground mass beneath the underwater pipeline to sink the underwater pipeline into the fluidified ground mass; wherein the broken ground mass comprises adjacent ground particles, and wherein the step of fluidifying the broken ground mass comprises maintaining hydrodynamic suspension of said adjacent ground particles in the water in a first area beneath the underwater pipeline; wherein the maintaining hydrodynamic suspension of said adjacent ground particles in the water in the first area beneath the underwater pipeline comprises: wherein a majority of the broken ground mass is not raised above the bed of the body of water.