JPH0611986B2 - Fender - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fender device for cushioning a shock of a ship or a floating structure in a harbor or ocean.

2. Description of the Related Art In the conventional general fender, as shown in FIGS. 7 and 8, the fender body 01 has a hollow cylindrical shape, and the fender body 01 has a front end on the surface of one receiving end 03. The impact plate 02 is attached, and the other attachment end 04 is fixed to a quay or the like.

The fender main body 01 is formed of a rubber elastic body, and its cross-sectional shape is a donut shape as shown in FIG.

When a fender with such a cross-sectional shape is compressed, the relationship between the reaction force and the compressive strain is about 50%, as shown in Fig. 9.
The degree is the maximum strain, and it is up to this point that the cushioning function is present and the compression strain is up to 55%.

Problems to be Solved by the Invention Generally, in order to increase the reaction force while maintaining the cushioning function, it is necessary to increase the cross-sectional area in the cross section parallel to the impact surface, and in order to increase the maximum strain, It is necessary to reduce the thickness.

Therefore, in order to improve the performance of the fender, it is possible to increase the size of the fender itself.

However, considering the economic efficiency of the port facility, how to reduce the installation space of the fender and how much absorbed energy is important is an important issue, which contradicts the increase in the size of the fender to improve its performance. It was supposed to be.

The present invention has been made in view of the above points, and an object of the present invention is to provide a small-sized and high-performance fender in which the cross-sectional shape of the fender is corrugated.

Means for Solving the Problems and Actions The present invention relates to a fender having a cylindrical elastic body side wall or parallel elastic body side walls facing each other, and a side wall section parallel to the impact receiving surface is formed in a corrugated shape. By increasing the cross-sectional area in the cross section parallel to the impact receiving surface and making the wall thickness appropriate, the performance can be improved without increasing the size of the fender.

Embodiments Embodiments according to the present invention shown in FIGS. 1 to 4 will be described below.

FIG. 1 is a partially cutaway perspective view of the fender body 1 according to the present embodiment. The fender body 1 is made of a rubber elastic body and has an impact receiving end 2 at an upper end and a mounting end 4 at a lower end. It is composed of a cylindrical supporting portion 3 which is tapered from the upper end to the lower end and widens toward the end, and the supporting portion 3 has a corrugated cross-sectional shape as shown in FIG.

The receiving end 2 and the mounting end 4 are formed with flanges 5 and 6 between the waves of the corrugated supporting portion 3 and the receiving end 2 and the mounting end 4 including the flanges. , Metal plates 7 and 8 having an annular disc shape are embedded in the interior (see FIG. 2).

The flange 5 of the impact receiving end 2 has a bolt hole 9, and an impact receiving plate (not shown) is attached to the end face of the impact receiving end 2 and is fixed by a bolt.

A mounting hole 10 is also provided in the flange 6 of the mounting end 4,
The fender body 1 is fixed to the quay with bolts or the like.

The fender body 1 of this embodiment has a corrugated cross section in order to obtain a large cross-sectional area in a small space.

If the number of waves is too large, the area of the flange becomes small and it becomes insufficient to mount the front plate, and if it is too small, the directionality for shear deformation becomes a problem.

Therefore, in consideration of the above, in order to form the corrugated cross section with a uniform wall thickness without difficulty, the number of waves is set to 8 and the wall thickness is set to about 1/3 of the amplitude of the wave.

The reaction force against compressive strain of the fender thus formed is as shown in FIG.

Since the cross-sectional area is large and the lateral and vertical stiffnesses are high, when the compression strain is small, the reaction force rises sharply almost in proportion to the compression strain, and when it exceeds the peak at about 20% compression strain, the reaction force exceeds a certain level. It retains strength and shows flat performance, and since the wall thickness is thin, the maximum strain reaches about 70%.

Compared with the performance of the conventional fender (Fig. 7), the mounting space is almost the same, and the cushioning function is maintained up to 70% of the compression strain due to a constant reaction force, and the performance is remarkably improved.

In addition, as the compressive strain increases, the reaction force does not rise excessively and becomes flat after passing a certain peak, so the reaction force does not become too large and forcefully pushes back the vessel, etc. Can work effectively as.

Further, since the cross-sectional area can be increased without increasing the wall thickness, the heat generated by repeated compression is small and the durability of the rubber elastic body is good.

In the present embodiment, the fender body 1 had a substantially conical shape,
Next, another embodiment of the fender having parallel side walls will be described with reference to FIGS. 5 and 6.

The fender body 20 has a plate-like shape with a corrugated surface, and is positioned in parallel with a pair of left and right sides. Flanges 23 and 24 are formed on the impact receiving end 21 and the mounting end 22, and a metal plate is embedded inside them.

The flange 23 of the impact receiving end 21 is formed with a bolt hole 25 for tightening a bolt for mounting the impact receiving plate between the ridges of the waves on the outer surface of the fender body 20.

Further, the flange 24 of the mounting end 22 is also formed with a mounting hole 26 for fixing to the quay or the like at a position facing the bolt hole 25.

Such a pair of parallel fender main bodies 20 are combined by attaching one front impact plate to the impact receiving surface, and by fixing to the quay etc., the horizontal and vertical directions despite the small installation area. In addition, a fender with high rigidity can be obtained.

EFFECTS OF THE INVENTION The present invention makes it possible to reduce the mounting area while maintaining high performance of the cushioning function by corrugating the side wall of the fender, thus enabling miniaturization.

In addition, since the cross-sectional area is large despite the small mounting area of the fender, the rigidity can be increased in both the horizontal and vertical directions.

Furthermore, since the elastic body of the fender is made thin,
The maximum strain of about 65% to 70% can be obtained, and the internal heat generation is small so that the durability can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment according to the present invention, FIG. 2 is a longitudinal sectional view thereof, FIG. 3 is a transverse sectional view thereof, and FIG. 4 shows the performance of the fender of the same embodiment. FIG. 5 is a characteristic view, FIG. 5 is a perspective view of another embodiment according to the present invention, FIG. 6 is a cross sectional view thereof, FIG. 7 is a perspective view showing an example of a conventional fender, and FIG. FIG. 9 is a transverse sectional view and FIG. 9 is a characteristic diagram showing the performance of the conventional fender. 1 ... Fender main body, 2 ... Impact end, 3 ... Support part, 4 ... Mounting end, 5,6 ... Flange, 7, 8 ... Metal plate, 9 ... Bolt hole, 10 ...... Mounting hole, 20 …… Fender body, 21 …… Impact end, 22 …… Mounting end, 23, 24 …… Flange, 25 …… Bolt hole, 26 …… Mounting hole.

Claims (1)

[Claims] 1. A fender having a tubular side wall of an elastic body or a parallel side wall of an elastic body facing each other, wherein the side wall has a corrugated cross-section parallel to the impact receiving surface. Material.