Reasons for general damage to wharf or bridge rubber fenders

Reasons for general damage to wharf or bridge rubber fenders

Rubber fenders are commonly used in docks. The amount of use is large, the probability of damage is also large, and the quality is a problem, and some are considered damage. Today, rubber fender experts have comprehensively analyzed the main reasons for damage to the rubber fenders of bridge terminals.

First, it exceeds the rubber fender capacity and the ship is overloaded.

This type of damage often occurs in rubber fenders , especially some old rubber fenders, which tend to crack in thin parts of the structure. The crack is generally in the length direction of the rubber fender. Type D and V-type fenders are more common. The primary cause of cracking of the rubber fender is that the kinetic energy of the ship hitting the fender is too large to exceed the acceptable load on the rubber fender . The reason for the excessive kinetic energy of the ship's impact is that it depends on the speed of the ship and the view point of the ship. In particular, when the ship's viewpoint is large, the bow touches the dock and the rubber fender in the middle of the hull, forming a strong impact kinetic energy concentrated on one or several fenders, causing damage to the rubber fender. The formation of the ship's impact function is too large. In addition to the above reasons, there are ships with docks that are larger than the planned ship type and tonnage, and the impact of wind waves on the ships.

Second, the anchoring of the pier and the installation of the rubber fender are not strong.

This situation has occurred in various types of bridge projects or dock rubber fenders. Rubber fenders are loose, off-position, and fall into the sea and other abnormal phenomena. The primary cause of this phenomenon is that the skills such as the bolts or chains that anchor the fenders are not good enough, or the repairs and maintenance are not keeping up. Metal materials such as anchor bolts and chains of fixed fenders are extremely rusted in the marine environment and are not easily replaced, resulting in poor rubber fenders , which seriously affects the normal operation of the fenders. Some anchor bolts are not too ambitious in practice because they take into account the conditions of replacement. For example, V-type rubber fender anchor bolts are in the form of pre-embedded bolt boxes. The original planning purpose is to facilitate the repair and replacement of the anchor bolts. However, in actual use, it cannot be replaced due to corrosion of the iron parts, deformation of the bolts, etc., and then affects the quality of the rubber fenders and forms the fall and damage of the fenders.

Third, the damage caused by the collision of the ship's high speed on the rubber fender .

This condition generally occurs in fixed V- and D-type rubber fenders . The fenders are mainly damaged by falling angles, cracks, and external abrasions. The primary cause of this damage is that the conflict between the rubber fender and the vessel is too great. When the vessel is docked at a large tangential speed, the rubber fender and the hull touch portion are forced to move forward together with the vessel due to excessive collision force, forming the fender sheared and damaged. In addition, during mooring operations, the vessel sometimes needs to move back and forth, as well as the left or right side of the vessel formed by waves, currents, and so on. In this case, when the coefficient of conflict between the vessel and the rubber fender is 0.4 (if the cable is pulled too tight), it is possible to cause damage to the fender.

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