JP4443804B2 - Fender - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to fenders that function as cushioning materials when docking and mooring to a quay such as a ship.
[0002]
[Prior art]
A conventional fender will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 shows the outer shape of the fender 200 having an outer shape obtained by extending the cross-sectional shape in the depth direction (the direction indicated by arrow A in FIG. 5), and FIG. 6 shows the cross-sectional shape in the circumferential direction (FIG. 6). The fender 300 having an outer shape (closed shape: shown in a partial cross section in the figure) developed in the direction indicated by the middle arrow B is shown.
[0003]
A fender 200 shown in FIG. 5 includes an impact receiving portion 205, a support leg 203 and a support leg 204 provided so as to extend in a bifurcated manner from the impact receiving portion 205 to the rear, and the support leg 203. , 204 are attached to a quay or the like, and an attachment leg 201 and an attachment leg 202 are integrally formed of an elastic material. In addition, the impact receiving portion 205 and the mounting leg portions 201 and 202 have a rectangular cross-sectional shape from a reinforcing viewpoint and extend in the direction indicated by the arrow A in the figure, and the impact receiving portion reinforcing plate 205a, leg portion reinforcing plate 201a, 202a is buried.
[0004]
On the other hand, the fender 300 shown in FIG. 6 includes a circular receiving portion 303, a supporting leg portion 302 that extends from the receiving portion 303 to the rear and extends in a cylindrical shape, and a supporting leg portion. Ring-shaped attachment legs 301 for attaching 302 to a quay or the like are integrally formed of an elastic material. In addition, a reinforcing plate 303a having a disk shape is embedded in the impact receiving portion 303 from a reinforcing viewpoint, and a reinforcing plate 301a having a ring shape is embedded in the mounting leg 301 from a reinforcing viewpoint. ing.
[0005]
[Problems to be solved by the invention]
The fender having the above shape is fixedly disposed on a quay or the like for the purpose, and is used for a long time. Therefore, the performance of buffering the impact is the most important, but excellent durability, that is, not breaking is also an important factor in evaluating the fender.
[0006]
As a factor that the fender is broken, the elastic member is broken at the end of the support leg portion of the fender. As a result of further detailed investigation, it was found that the cross-sectional shapes of the reinforcing plates 201a and 202a are rectangular, and that stress is strongly concentrated and acts on the corners formed by intersecting the surfaces. . For example, as shown in FIG. 7, as a result of the bending moment M being applied to the inner region A of the reinforcing plates 201a and 202a, a crack K is generated in the elastic member around the corners of the reinforcing plates 201a and 202a. Thereby, an elastic member is damaged, seawater penetrate | invades into this inside from this damaged location, and rust generate | occur | produces in the reinforcement boards 201a and 202a. As a result, the adhesive force between the elastic member and the reinforcing plates 201a and 202a is reduced, the elastic member is peeled off, and the fender itself may fall off the quay. Similarly, even when a bending moment M ′ is applied to the outer region A ′ of the reinforcing plates 201a and 202a, it is conceivable that the elastic member cracks around the corners of the reinforcing plates 201a and 202a. The same phenomenon can be said for the fender having the shape shown in FIG.
[0007]
Accordingly, an object of the present invention is to provide a fender having a structure capable of preventing the occurrence of cracks in an elastic member caused by a reinforcing plate, in order to solve the above problems.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the inventor has made various studies and found that by optimizing the shape of the reinforcing plate, it is possible to prevent the elastic member from cracking due to the reinforcing plate. .
[0009]
Therefore, in the fender according to the present invention, an impact receiving portion, a support leg portion provided to extend rearward from the impact receiving portion, and an attachment leg for attaching the support leg portion to a quay or the like The fender is a fender integrally formed of an elastic material, and a reinforcing plate is embedded in at least one of the receiving portion and the mounting leg, and two surfaces of the reinforcing plate intersect At least one or all of the corners in the longitudinal direction are chamfered under Condition 1 or Condition 2 shown below.
[0010]
Condition 1: [Reinforcement plate thickness (t) / 100] ≦ Chamfer radius (R) ≦ [Reinforcement plate width (L) × 100]
Condition 2: [tan ⁻¹ (t / 100 L)] ≦ chamfer angle (θ) ≦ [tan ⁻¹ (100 t / t)]
In this way, by chamfering the corners of the reinforcing plate satisfying the above conditions, the stress concentration on the elastic member at the corners of the reinforcing plate is alleviated and cracking of the elastic member can be prevented. It becomes.
[0011]
As more preferable conditions, the above conditions 1 and 2 are preferably the following condition 3 or condition 4 or a combination thereof.
[0012]
Condition 3: [Reinforcement plate thickness (t) / 10] ≦ Chamfer radius (R) ≦ [Reinforcement plate width (L) × 10]
Condition 4: [tan ⁻¹ (t / 10L)] ≦ chamfer angle (θ) ≦ [tan ⁻¹ (10 t / t)]
By adopting this condition, the stress concentration on the elastic member at the corners of the reinforcing plate can be effectively relieved, and the occurrence of cracks in the elastic member can be prevented.
[0013]
Preferably, in the above invention, the reinforcing plate is provided on the mounting leg portion, and the reinforcing plate is disposed so that the end face portions are opposed to each other, and in the longitudinal direction of the reinforcing plate at the opposed position on the inside. The chamfer is applied to the corner. More preferably, chamfering is performed on the receiving portion side of the corner portion of the reinforcing plate. In this way, by concentrating and chamfering at the corners of the reinforcing plate where cracks are likely to occur, the stress concentration on the elastic member at the corners of the reinforcing plate is effectively and effectively reduced. It is possible to prevent cracks from occurring.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the structure of the fender in one embodiment based on this invention is demonstrated with reference to FIG. In addition, FIG. 1 is a perspective view which shows the whole structure of the fender 100 in this Embodiment.
[0015]
Referring to FIG. 1, fender 100 in the present embodiment has basically the same structure as fender 200 in the prior art described with reference to FIG. A support leg 103 and a support leg 104 provided so as to extend in a bifurcated manner from the receiving part 105 toward the rear, and an attachment leg 101 and an attachment leg for attaching the support legs 103 and 104 to a quay or the like 102 are integrally formed of an elastic material. Further, the impact receiving portion 105 and the mounting leg portions 101 and 102 have a rectangular cross-sectional shape from the viewpoint of reinforcement, and extend in the direction indicated by the arrow A in the figure, the impact receiving portion reinforcing plate 105a, the leg portion reinforcing plate 101a, 102a is buried.
[0016]
Here, the characteristic structure of the fender 100 in the present embodiment lies in the shape of the leg reinforcing plates 101 a and 102 a embedded in the fender 100. As the shape of the leg reinforcing plates 101a and 102a, the corners on the receiving portion 105 side of the leg reinforcing plates 101a and 102a at positions facing each other inside the leg reinforcing plates 101a and 102a (X1, in the figure). A predetermined chamfer is applied to the area surrounded by X2. Here, the corner portion of the leg portion reinforcing plate is an angle at which the surfaces of the six surfaces M1 to M6 constituting the leg portion reinforcing plate 101a intersect as shown in FIG. 2 when the leg portion reinforcing plate 101a is described. Means corners C1 formed by crossing M1 and M2, corners C2 formed by crossing M1 and M4, and corners formed by crossing M1 and M3 Corner C4 formed by crossing parts C3, M1 and M5, Corner C5 formed by crossing M6 and M2, and Corner C6 formed by crossing M6 and M4 , M6 and M3 intersect with each other, corner C7, M6 and M5 intersect with each other, corner C8, M2 and M5 intersect with each other, corners C9, M2 And M4 intersect In the case of the present embodiment, the corner C10 formed by the intersection of M4 and M3, and the corner C12 formed by the intersection of M3 and M5 are included. In the leg portion reinforcing plate 101a, a predetermined chamfer is applied to the corner portion C4. Similarly, in the leg portion reinforcing plate 102a, a corner portion is present, and a chamfer is applied to a position corresponding to the corner portion C2. . The reason why the corners of the leg reinforcing plates 101a and 102a on the side of the receiving portion 105 are chamfered is that stress is considered to be concentrated most in these portions.
[0017]
Here, as conditions for chamfering applied to the corners of the leg reinforcing plates 101a and 102a, the following condition 1 or condition 2 can be mentioned. Condition 1 shows the chamfer radius (R) of the corner shown in FIG. 3A, and Condition 2 shows each chamfer (θ) of the corner shown in FIG. 3B (L1 = 5 mm in the figure). , T1 = 16 mm). In the conditions, t represents the thickness of the leg reinforcing plate, and L represents the width of the leg reinforcing plate.
[0018]
Condition 1: [Reinforcement plate thickness (t) / 100] ≦ Chamfer radius (R) ≦ [Reinforcement plate width (L) × 100]
Condition 2: [tan ⁻¹ (t / 100 L)] ≦ chamfer angle (θ) ≦ [tan ⁻¹ (100 t / t)]
In the above condition 1, a chamfer radius (R) that satisfies the following condition 3 is selected as a more preferable condition, and in the above condition 2, a chamfer angle (θ) that satisfies the following condition 4 is selected as a more preferable condition. It is also possible to set a condition that satisfies both condition 3 and condition 4 at the same time.
[0019]
Condition 3: [Reinforcement plate thickness (t) / 10] ≦ Chamfer radius (R) ≦ [Reinforcement plate width (L) × 10]
Condition 4: [tan ⁻¹ (t / 10L)] ≦ chamfer angle (θ) ≦ [tan ⁻¹ (10 t / t)]
(Example)
(Fender 100)
Next, an example of the fender 100 that has been chamfered to satisfy the above condition 1 and the results of repeated compression tests on the fender 100 will be described with reference to FIG. The dimensions of the mounting legs 101 and 102 of the fender 100 and the dimensions of the leg reinforcing plates 101a and 102a embedded in the mounting legs 101 and 102 are as shown in FIG. t) = 16 mm, width (L) = 258 mm, depth length (H) = 960 mm, chamfer radius (R) = 5 mm, and steel plate equivalent to SS400 is used as the material of the leg reinforcement plate It is done. Here, the chamfer radius (R) = 5 mm is a value satisfying [16 mm / 10] ≦ chamfer radius (R) ≦ [258 mm × 10]. In addition, as an elastic member used for the fender 100, a rubber member blended with natural rubber and butadiene rubber was used. Moreover, as a dimension of the fender 100, height is 400 mm and length is 100 mm.
[0020]
(Repetitive compression test)
A compression test was repeatedly performed by comparing the fender 100 embedded with the leg reinforcing plate satisfying the above specifications and the fender 200 having a conventional shape without chamfering. In addition, as a repetitive compression test, a fender is used until the compression ratio reaches 50% [compression ratio = ((pre-deflection fender height−deformation fender height) / pre-deflection fender height) × 100] The endurance compression continuous test was repeated 10,000 times in order to compress and displace the receiving portion side toward the mounting leg side and then gradually return the displacement to the original compression rate of 0%.
[0021]
(Compression test result)
When the number of times that the fender is broken is compared, in the case of the fender 200 having a conventional shape that is not chamfered, a broken portion (crack) is generated about 3000 times. On the other hand, in the case of the fender 100 based on the present example which has been chamfered, no fractured portion (crack) occurred even after the test was repeated 10,000 times.
[0022]
(Action / Effect)
As described above, in the fender according to the present embodiment, a predetermined chamfering process is performed on predetermined portions of the corners of the leg reinforcing plates 101a and 102a embedded in the fender 100, so that an external force is applied to the impact receiving unit 105. Even when F is applied and a rotational moment M is applied to each inner region of the mounting leg 101 and the mounting leg 102, the stress concentration at the corners is alleviated and the leg reinforcing plates 101a and 102a are reduced. By preventing the elastic member from peeling off, it is possible to greatly improve the durability of the fender.
[0023]
In the above embodiment, chamfering is performed on the corners in the longitudinal direction on the side of the receiving portion 105 of the reinforcing leg portion strong plates 101a and 102a that are opposed to each other inside the leg reinforcing plates 101a and 102a. Although the case has been described, chamfering that satisfies the above-described conditions 1 to 4 is also applied to other corners where the stress is likely to concentrate (corners selected from the corners C1 to C12 when FIG. 2 is referred to). Can be applied. Further, it is possible to chamfer not only the leg reinforcing plate provided on the mounting leg part but also the receiving part reinforcing plate provided on the receiving part.
[0024]
Further, as for the types of fenders, not only the fenders having the outer shape shown in FIG. 1, but also the receiving part reinforcement provided in the receiving part of the fender having the outer shape shown in FIG. 6 of the conventional structure. Similar effects can be obtained by chamfering the plate and the leg reinforcing plate provided on the mounting leg. In this case, the reinforcing plate width (L) in the conditions 1 to 4 can be set by replacing the reinforcing plate width (L) with the diameter of the reinforcing plate.
[0025]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[0026]
【The invention's effect】
According to the fender according to the present invention, by applying predetermined chamfering to the corners of the reinforcing plate, the stress concentration on the elastic member at the corners of the reinforcing plate is alleviated, so that cracks in the elastic member occur. Generation | occurrence | production is prevented and it becomes possible to improve the durability performance of a fender.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing the structure of a fender 100 according to an embodiment of the present invention.
FIG. 2 is an overall perspective view of a reinforcing plate 101a embedded in a fender 100 according to an embodiment based on the present invention.
FIGS. 3A and 3B are partially enlarged cross-sectional views for explaining chamfering of a reinforcing plate 101a.
FIG. 4 is a partially enlarged cross-sectional view for explaining a dimensional relationship in an example of the fender 100 according to the embodiment of the present invention.
FIG. 5 is an overall perspective view showing the structure of a fender 200 in the prior art.
FIG. 6 is an overall perspective view showing the structure of a fender 300 in the prior art.
FIG. 7 is a schematic view for explaining problems of the fender 200 in the prior art.
[Explanation of symbols]
100 fenders, 101, 102 mounting legs, 103, 104 support legs, 105 receiving parts, 101a, 102a leg reinforcing plates, 105a receiving part reinforcing plates, C1-C12 corners, M1-M6 surfaces.

Claims (4)

An impact prevention part, a support leg provided so as to extend rearward from the impact receiving part, and a mounting leg for attaching the support leg to a quay or the like are integrally formed of an elastic material. It ’s a wood,
A reinforcing plate is embedded in at least one of the receiving part and the mounting leg part,
A fender having at least one or all corners in the longitudinal direction where the two surfaces of the reinforcing plate intersect are chamfered under the following condition 1 or 2 or conditions 1 and 2.
Condition 1: [Reinforcement plate thickness (t) / 100] ≦ Chamfer radius (R) ≦ [Reinforcement plate width (L) × 100]
Condition 2: [tan-1 (t / 100L)] ≦ chamfer angle (θ) ≦ [tan-1 (100t / t)] 2. The fender according to claim 1, wherein the condition 1 and the condition 2 are preferably the following condition 3 or 4 or a combination thereof.
Condition 3: [Reinforcement plate thickness (t) / 10] ≦ Chamfer radius (R) ≦ [Reinforcement plate width (L) × 10]
Condition 4: [tan-1 (t / 10L)] ≦ chamfer angle (θ) ≦ [tan-1 (10t / t)] The reinforcing plate is provided on the mounting leg;
The said reinforcement board is arrange | positioned so that an end surface part may oppose, The said chamfering is given to the said corner | angular part of the longitudinal direction of the said reinforcement board in the position which opposes inside. Firewood.   The fender according to claim 3, wherein the corner portion located on the side of the receiving portion of the reinforcing plate is chamfered.

Images