What Are The Requirements For The Use Of Cylindrical Rubber Fender Docks?

Cylindrical rubber fender features low reaction force, small surface pressure, reasonable energy absorption; strong adaptability to ship roll and pitch when berthing, not affected by ship size, wide application, convenient installation and maintenance, especially suitable for On the old pier.

The performance is improved by forming the rubber pad portion (where the position and length are specified) in the region adjacent to the buckling peripheral line of the rubber bearing portion, wherein the inner and outer surfaces are formed in a frusto-conical shape.

The cylindrical fender is composed of a rubber bearing part 2 and a rubber mounting part 3, in which the inner and outer surfaces are formed into a truncated cone shape, and a ring-shaped iron plate is embedded in the rubber fender mounting part, and a collision receiving section 4, in which the Annular iron plate 5 is arranged.

The height of the fender is set to H, h1 = 0.6H-0. 95H is kept at the position h1 of the buckling peripheral line P formed on the outer surface of the bearing part 2, while the rubber pad part 9 is formed near the line P, and 11<0.5H is kept in the length of the rubber pad part 9. h2 = 0.2 H-0.6H is kept at the position h2 of the buckling peripheral line L formed on the inner surface of the bearing part 2 as needed, the rubber pad part 9o is formed near the line L, and 12<0.75H keeps the length of the rubber pad part 9o.

At the time of collision reception, the entire surface is in contact without forming space to bend in line P, L in the fender, and energy loss is reduced. Therefore, a reduction in response can be prevented.

What are the requirements for the use of rubber fenders for cylindrical docks?

It is difficult for cylindrical wharf fenders to meet the application requirements in terms of energy absorption; under normal ship berthing conditions, drum fenders can meet the application requirements in terms of energy absorption. However, in order to avoid shear damage to drum fenders, steel chains should be installed at appropriate positions.

Cylindrical pier fenders hang from the pier apron, constrained only by the upward pull of the chain and the vertical force of the pier wall. If considering the conflict between the fender and the wharf apron wall and the hull, it is also constrained by the horizontal force along the wharf wall. According to the material, rubber cylindrical fenders and polyurethane cylindrical dock fenders are now used. Because the friction coefficient of the polyurethane fender is small (only 0.12), the horizontal direction along the pier wall is the axis direction of the cylindrical fender, and the shear damage caused by the collision force will not be very large, so only the vertical compression force needs to be considered.

For the rubber fender of the drum dock, due to its large volume and large vertical compression, its energy absorption is very large among the existing fenders, but the disadvantage is that it is easy to be hit by the side of the hull and generate a large shear force. strength. Therefore, it is very necessary to consider its horizontal force. Due to the large size of the ship, the fenders of the drum dock follow certain rules when placed, so the fenders of the drum dock are unlikely to be directly affected by the horizontal thrust, and are mainly affected by the shear force generated laterally.

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