Pipeline Lifting Mechanics Research of Horizontal Directional Drilling

Abstract

During lifting pipeline of horizontal directional drilling (HDD), the rotation angle of pipeline is determined by such parameters as the location of lifting point, axial force, and length of pipeline. The continuous beam theory is used to analyze the mechanical behaviour of pipeline during lifting construction, and the mechanical model of pipeline during lifting construction process is established. The analysis results show that the lifting height of gondola 1 varies linearly with the length of pipeline. The lifting height of gondola 2 varies linearly with axial force and pipe gravity. The longer the spanning pipeline is, the higher the lifting height is. The lifting height of gondola 2 varies curve trend with the axial force and pipe stiffness. When the length of pipeline is small, the lifting height of gondola 2 is approximately 0.

Dynamic Analysis of Pipeline Lifting Operations for Different Current Velocities and Wave Heights

“…Wu et al [13] tested the pipeline's mechanical behavior in the pipeline laying process through experimental methods, and the experiment test results are compared with the theoretical results. Guo et al [9] used the continuous beam theory to analyze the mechanical behavior of pipelines during lifting construction and implemented the mechanical model of pipelines during the lifting construction process. The analysis showed that the lifting height varies linearly with the pipeline length.…”

Inflectional Heavy Elastica with Unilateral Contact constraint: Analytical Solution through the Curvilinear Abscissa Mapping approximation

“…This problem leads to a Heavy Elastica of variable length supported on a ground. Some studies dedicated to this topic are: [4,15,17,18,27,28]. All previous authors employ a numerical approach to address this issue.…”