What factors need to be considered in the analysis of lifting points for buried pipelines during overall lowering into the trench?
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What factors need to be considered when determining the lifting points for the overall lowering of buried pipelines into the trench? Bending radius, lifting capacity, maximum displacement. . . What else is there? What are the formulas that are used frequently? What is a suitable distance between two lifting points? :P
Based on the condition of fixed supports at both ends, the load capacity is calculated. Using principles of material mechanics, the location of the maximum bending moment is determined, and the bending stress at that point is computed. Then, by applying the deflection formula, the maximum span is calculated: L = 5ql^4/(384EI)/fmax. It is also necessary to take into account the stiffness of the steel tube to ensure that instability does not occur；
To build on what was said above, one should first consider the number of lifting equipment available with the construction company, determine the number of lifting points, and then calculate the maximum span by applying the formula for the maximum deflection under equal concentrated loads arranged at equal intervals across the span, with the deflection occurring at the midpoint of the pipe. The distance between the two lifting points is related to the number of lifting points