JPS5953402B2 - Barrier material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fencing member, and in particular has flanges at both ends of a hollow cylindrical body wall for installation on a quay and flanges for attaching an impact receiving member. We are proposing an improvement to the so-called cell-type fender, which is made of rubber or rubber-like elastic material with reinforced ring-shaped rigid plates and fillet reinforcement at the large corners of the base of the flange for each attachment on the body wall. It is something.

This type of cell-type protection material maintains an almost constant reaction force after the shell diameter expands and deforms under the contact load of the shell wall, the rate of increase in reaction force decreases, and a nearly constant reaction force is maintained. The buckling deformation region exhibits contact impact mitigation characteristics as shown in the solid line hole in Figure 1, which is included during the subsequent mutual contact between the inner surfaces of the shell wall and the compressive deformation, and reduces the absorbed energy. Because of its great value, it has been widely used not only in Japan but also overseas, and has been well received and prized.

However, in order to induce the above-mentioned buckling deformation accurately, conventionally, a pair of annular grooves were provided near the boundary of the initial expansion diameter region of the via barrel shape caused by an upright load on a right cylindrical body wall. do.

In other words, in Fig. 2, 1 is a trunk wall, 2 is a flange used for installing a fencing material or an impact plate, and 3
is an annular groove, 4 is an annular rigid plate 5 provided in the flange 2, is a fillet reinforcement provided at the thick corner of the flange 2, and 6 is a bolt hole of the flange 2.

As shown in FIG. 3, the final posture of the conventional cell-type protection material after compression deformation is such that the buckling deformation is limited by the annular grooves 3, so that right cylindrical portions 1 are formed near both ends of the shell wall 1. 'a
After that, the characteristic curve A in Fig. 1 shifts to a simple compressive deformation that rises steeply. is compressed to a value obtained by subtracting the deformation amount δ1, but there was a disadvantage that the deformation stroke of the shell wall 1 was limited by the annular groove 3.

Therefore, in order to guide the deformation of the body wall over almost its entire length, the present invention has developed an area adjacent to the fillet reinforcement provided at the large corner of the base of both flanges 2, as shown in an embodiment in FIG. There is an annular groove 3 inside that extends all the way around the trunk wall.
′ is transferred and the buckling deformation is forcibly caused from that part, so that the deformation process in the final posture of the flattened deformation of the cell type brace material corresponding to FIG. 3 is shown in FIG. 5 as δ2.
As a result, the energy characteristic curve becomes
This is an improvement as shown by the broken line B in the figure.

Here, the annular groove is adjacent to the fillet reinforcement, and one groove is formed at each end of the shell wall in an adjacent area where the distance from the flange is within 0.07 to 0.2 times the flange surface spacing H. With this arrangement, the flange surface spacing H, which is the standard dimension of the cell-type fencing material, is 1450 mm, and the body diameter is 1360 mm.
mm, body wall thickness T is 225 mm, flange diameter is 1850 m
In the example for the case of m, the total compressive strain is increased by about 5%,
As a result, the absorbed energy can be increased by 10% to 15%.

In addition, regarding the tubular fender of the above size provided with a plurality of annular grooves (Japanese Patent Application Laid-open No. 54-129696),
As a result of the comparison, the superiority of this invention was confirmed.

This will be described in detail following an experiment.

In other words, prepare 7 pieces of test material with the above size, and first, calculate the value of the ratio of the distance of the position of the annular groove 3' measured from the surface of flange 2 to the flange surface spacing H for each material with one annular groove. The antifungal properties of various test products 1 to 5 below were compared within the range of 0.03 to 0.25.

Test product 1 Position of outer edge of annular groove 45mm (0,03
H) Dimensions of annular groove Semicircle test product 2 with a radius of 25 mm Position of the outer edge of the annular groove 3' 100 mm (0,0
7H) Dimensions of annular groove 3' Semicircular test product 3 with a radius of 20 mm Center position of annular groove 3' 200 mm (0,1
4H) Dimensions of annular groove 3' Semicircle test product 4 with a radius of 15 mm Position of inner edge of annular groove 3' 290 mm (0,2
H) Dimensions of annular groove 3' Semicircle test product 5 with a radius of 10 mm Center position of annular groove 360 mm (0,25
H) Dimensions of annular groove A compression test was conducted for each semicircular test product with a radius of 5 mm, and the strain-reaction force curve (thick solid line) shown in FIG. 6 was obtained.

Based on this graph, the absorbed energy is calculated and shown in the same figure.
As shown by the broken line A, since the maximum value of the reaction force is 75 tons in the strain-reaction force curve, we determined the usage range up to 76 tons, where the absorbed energy per unit reaction force is the maximum, and for each test product, The absorbed energy can be read from Figure 6 for test product 1 29. Oton-mete
r test product 2 33. Oton-me
ter test product 3 32. Oton-
Meter test product 4 30,8 to
n-meter test product 5 28.3
This is a ton-meter, and here is the test item 2. 3.
4 has significantly higher absorbed energy than test product 5, which is a conventional product, and compared to test product 1, which has an annular groove located on fillet reinforcement 5. 9% to 1 compared to conventional products corresponding to 5.
resulting in an increase of 7%.

Regarding distortion, according to Figure 6, the distortion of the conventional product corresponding to test product 5 is 46%, while the distortion of test products 2 to 4 is 52% to 49%, so it is about 5%. 6%
It is possible to secure an increase close to .

Furthermore, when the shape of the annular groove 3' is made into a semicircle, the minimum R dimension that can force the occurrence of buckling deformation there was determined by experiment, and it was found that the minimum R dimension was 0.07H to 0.2H with respect to the flange surface spacing H. For the annular groove 3' located in the area, a ratio of 0.006 to 0.015 times H is suitable for test product 2.

In addition, the cross-sectional shape of the annular groove 3' is shown in FIGS. 7a to 7d.
As shown in the various modifications, there are trapezoidal grooves with depth A and base width B (a in the same figure), arcuate grooves with depth A and radius R (b in the same figure),
A similar circular arc groove as shown in b has a reduced diameter trunk wall of depth C adjacent to the inner edge (C in the same figure), and a single-width round bottom triangular groove with an inclined wall in contact with the circular groove (d in the same figure). ), and their dimensions are A: 0.005~O, OIH, B: 0.01~
0. LH.

C: 0,001-0. OIH,D: 0.01~0
．． 2H.

R: By selecting from the range of 0.005 to 0.02H, the above-mentioned improvement in the fire prevention performance can be advantageously brought about without any significant problem with the strength of the shell wall.

Next, a similar experiment was conducted on a cylindrical fender having multiple annular grooves of the same size as the test item.

Test product 6 Test product 2 and test product 3 have two annular grooves at each groove position.

Test product 7 Test product 2, test product 3, and test product 4 have three annular grooves at each groove position.

The results of this compression test are as shown in the strain-reaction force curves (single-dot and two-dot chain lines) in Figure 6. As in the previous case, the absorbed energy obtained from this graph is the broken line B,
In the absorbed energy curve shown by C, here, the absorbed energy is calculated using the usage range up to 6 tons of anti-cuff as in the previous time. Test product 6 29. Oton-me
ter test article 7 28.5 ton-meter, and the absorbed energy of test articles 2, 3 and 4 according to the present invention is increased by 14% to 16% compared to test articles 6 and 7 which have multiple annular grooves.

This is because when a cylindrical shield material with multiple annular grooves is compressed, there are multiple annular grooves that lead to outward curvature deformation, so the trunk wall easily expands in curvature, and as a result, the distortion stroke The reaction force is lower over almost the entire area (see Figure 6), resulting in a decrease in absorbed energy.

Furthermore, at the end of the compression deformation, as shown by the dashed line in FIG. , occurs relatively inside, and therefore, when viewed from the cross-sectional shape, the length of the moment arm between the force application point (arrow 9) on the flange 2 is short, so the so-called spring constant is high, and the final rise of compression is If it is sudden and exceeds the range of use, there is a risk of damage to the ship's side and berthing facilities.

Performance characteristics slightly outside this usage range are important, and ships often berth while exceeding the set berthing speed.
Even when looking at the above, since the annular groove 3 was not located near the flange 2, the curvature of the shell wall was not steep, and the mutual contact between the inner surfaces of the shell wall was located relatively inward, resulting in a steep rise in the final stage of compression. .

As shown by the solid line, the product of this invention is bent at one place near the flange 2, so the bend is steep, and therefore, the mutual contact on the inner surface is higher than that of the conventional example, and the load of mutual contact on the outside is As a result, as shown in FIG. 6, the final rise of the compression is gradual, and even if it exceeds the usable range, it will not immediately lead to a dangerous situation.

As described above, according to the present invention, there is one annular structure at each end of the shell wall in the area adjacent to the fillet reinforcement of the flange attachment joist corner of the cell type fencing material, so that the fencing material By directing the bulge-diameter bending deformation caused by the acting upright load closer to the base of the flange, the flange installation can reduce the buckling deformation that occurs after the bulge-diameter deformation described above has progressed without affecting the strength. The compression deformation process of the hull wall including the hull wall has been expanded to almost the entire length of the hull wall, which significantly improves the performance efficiency of the fencing material, and the final rise of compression is more gradual, allowing it to cope with abnormal berthing of ships. can.

□Brief explanation of the drawings Figure 1 is a characteristic diagram of the cellular type insulation material, Figure 2 is a sectional view showing an example of cellular type insulation material in the United States, Figure 3 is an explanatory diagram of its compression deformation behavior, Figure 4 is a sectional view showing an embodiment of this invention;
Figure 5 is an explanatory diagram of the flattening behavior, and Figure 6 is the strain-reaction force (solid line) and strain-absorbed energy (broken line) of each test product.
FIGS. 7a to 7d are characteristic diagrams showing a specific example of an annular groove, and FIG. Part) is a sectional view.

1... Trunk wall, 2... Flange, 3'... Annular groove, 4... Annular rigid plate material, 5... Fillet reinforcement.

Claims (1)

[Claims] 1 At both ends of the hollow cylindrical body wall, there are flanges for installation on the quay wall and flanges for attaching the impact-receiving member, and both flanges are reinforced with annular rigid plates. Each wall attachment consists of a molded body of rubber or elastomer-like material with fillet reinforcements at the large corners at the base of the flange;
A bracing material characterized by having one annular groove at each end of the shell wall in the area adjacent to the fillet reinforcement.