Research On The Methods Of The Long-Distance Transport Of The Thin & Long Large- Diameter Cylinders

At present, the construction technology of the large-diameter cylinders are mostly adopt handy prefabrication and fixing principles at home or abroad, therefore, most of the researches and engineering practices are aiming to the short-distance transporting problems of the large-diameter cylinders. As the promotion of large-diameter cylinders applied technology, the precast yard can be far away from the fixing place where the raw material supply is abundant. This calls for feasible methods to transport large-diameter cylinders between long distances. However, the study on this field is still at the primary stage, especially the thin&long cylinders which has the most complex situation during transporting.This paper departing from the angle of satisfying real engineering, has designed a method of the transport of the large-diameter cylinders between long distances which the cylinders are lied down before they are loaded on the carrier to avoid the attack of wind, wave and flow during the transportation. The way to lie down the cylinders is adding an air cell which has the same shape with the cylinder as well as interlayer. Through contriving the flowing paths and states of the water and air in the interlayer, the centroid of whole installation has been changed to let down or erect the cylinders. The main work of this paper is to design out the specific process of this scheme, which includes lying-down methods of the cylinders, the way cylinders are placed on barge and the way to unload the cylinders. The key point is how to design the interlayer of the air cell which drives the cylinder to topple over. Several methods were given in this paper to fulfill the purpose. The flowing paths and states of the water and air of each method are prescribed respectively. With the finite element software ANSYS, the stress of the cylinders of each method is calculated. Also, qualitatively comparison of these methods was given based on factors like: the smoothness grade of the centroid's moving trail, the equality grade of the cylinder's stress. It shows that the one which makes the water in interlayer distributing equally along the cylinder's circle and has the smallest water volume is the fittest method. The scheme set up in this paper to transport thin&long large-diameter cylinders has obvious advantages and is feasible in theory.