Planning, design and construction of dock rubber fender equipment
- 2019-04-23-

The main purpose of the ship's rubber fender system is to prevent the ship from being berthed around the mooring process. When the boat is backed by a boat, it has a commensurate kinetic energy. After hitting the bow, whoever insists on it must be released. Perfunctory in the boat, its debate rushing momentum is low, the process of probation is also less, so the energy released is also very low, perfunctory in the boat, it is necessary for the boat to envision the staff who are facing the mooring impact, It also provides a fender system that can exchange rich energy to prevent damage to the boat and the boat.

Perfunctory in small ship rafts, wood fenders are widely used; although some large-scale ship sterns are also used: the wood fender system is a fruit-grain fiber that is squeezing and deforming, causing all the crushing and absorbing energy, but its energy The ability to collect foreign exchange is very low. When high-energy impulses emerge, the wooden fenders will be damaged due to the large amount of energy added to the sinks. The wooden fender system is often used to change the individual components. Adding a wooden fender to absorb energy first, the more extensive measures are between the traditional wooden fender take-off raft structure, set up equipment to display a series of extruded variant rubber components. In theory, the fender system is not widely used, but its energy distribution skills are still not enough.

The large-scale energy fender system previously studied has led to the growth of gravity fender systems. The theoretical evidence for those fender systems is the law of energy conversion, which converts the kinetic energy of the ship into potential energy through the process of adding the weight of the fender. However, the gravity fenders cost a lot of money, and the amount of training in the structure of the support system is also large. Two or thirty years ago, the fender installation equipment exhibited the use of steel springs as a component of the discharge energy. At this time, it was able to trigger people’s perceptions because of its high energy and high-priced construction. Support its weight. The main achievement is that the components are prone to rust. Following the continuous growth of the rubber fenders, the steel springs were slowly replaced and replaced with them.

The rubber fender is the Leijin-type energy dissipating pad with high energy absorption. It is the reason that the rubber component on the steel pad is sheared and exchanges energy. Even though in the 1960s, there was a phase in the Tianqu area where the Leijin-style energy-dissipating mat was placed. However, in the 1970s, there was another rubber fender that was cheaper, had higher energy absorption, and did not need to be repaired frequently. instead.

First, the fender example

There are many examples of rubber fenders on the market, each with its own unique characteristics and certain advantages. There are several types of types that are widely used outside the fender setting equipment display display:

1. Buckling type;

2. Inflatable type;

3, foam type;

4, side back Mongolian cylinder type (drum type);

5. Perfunctory V type {ie X type):

6, flexible pile type.

Figure 1 illustrates the variation of the reaction forces of the above various examples. Outside the map, all kinds of fenders are having the same amount of energy to absorb. In other words, if the reaction product has a high dot product with a high deformation curve, the energy absorption is different. Nothing from the outside of the picture, the buckling type fender is perfunctory to the given reaction force. The deformation of the energy of the discharge is much smaller than the other ones, even though it borrows some gaps, but the small deformation characteristics still make it a widely used. It is assumed that the large-scale department of the boat-type tonnage will have a reactionary force in the era of the boat-type tonnage, and many of the buckling-type protective perforating boats understand the pressure of forming a proportional, and, in particular, use a plate to put pressure The diffusion is reduced. When the external force of the fender point is not vertical, the ability of the fender to collect the assault energy will be reduced.

Inflatable and foam fenders have different reaction forces - deformation curves. From the outside of the figure, they are more deformed than the buckling fenders. Therefore, the overhanging distance of the display equipment is also required. In the case of the above-mentioned example, the round-shaped floating fenders of the large-sized type have a small contact pressure on the hull. Therefore, it is not necessary to add a slab to the hull. However, it is necessary to add a blank board to the small indirect installation of the fenders on the bow structure. As for the inflatable type, the foam fender is taking advantage of the times, and its reaction force reaches an environment where the anti-force is about to emerge.

Perfunctory in the sky where the energy emission request is not too high, widely used the side-backed Monroe cylinder type (drum type) fender, even if the contact pressure of the perfunctory boat is relatively large and the tightening is more difficult, but Compared with paying a noble price, it still has certain competitiveness. The V-type fenders are taking the above-mentioned different premise. The Tianfang is also very popular in the market. Some V-type fenders are equipped with a single-backing point plate, which makes the dot product of the energy collection even larger.

The flexible pile-type fenders are used for the natural premise of the soil, so that it separates the fenders from the boat members. The energy absorption of the pile depends on its smallness, and the anti-collision system of that type is especially suitable for use outside the deep water.

Two, envisaged procedures

So far, the scale of the protection system of the same seaport (boat) has not been envisaged. In 1978, the International Standing Committee on Shipping Solidarity (PLANC) established an international committee to improve the concept of the fender system, with the aim of creating a document that inspired the display of the fender-set equipment: the members provided the main achievements of the Flint-related concept. The views of the same amount are manned and are being secretly issued in 1984. It serves as a point of view for the more prestigious fenders, the installation of the equipment, the introduction of the literature, and the introduction of the fenders.

In addition to the PIANC academic report, the three basic measures of perfunctory energy absorption calculations are described. That is, mathematical statistics measures; mathematical model methods; dynamic measures. In addition, the use of less work, the more limited is the dynamics method. Its theoretical basis is the kinetic energy equation, that is, the kinetic energy of the object's initiative to generate the explosion {that refers to the mooring kinetic energy) is the object quantity measured by half of the square product of its action rate (E = 1/2mi). However, the full kinetic energy of the boat's initiative cannot be fully collected by the fender system. On weekdays, when we calculate the energy absorption, we multiply the total kinetic energy of the boat by a factor. The coefficient of the person is composed of four departments, namely: the number of centrifuged fruit C. : Added amount of fruit Cm: Softness number C. And the number of fruit cc:f=C. Cm Cs Ce

Centrifugal fruit number resolution in the boat and the impact of the point of influence relative to the position paid to the center of the ship. The measures for calculating Ce in the 20-year premise are very simple, that is, Ce is the square of the inertia radius of the boat, divided by the square of the radius of inertia to take the center of gravity of the boat to the point of debate and influence, and, of course, borrow more It’s a good day, but it’s not needed on weekdays.