JP3628438B2 - Fiber reinforced resin unit board - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a unit plate made of fiber reinforced resin, and more particularly, to a unit plate of a shallow box-shaped body integrally formed of fiber reinforced resin, which is used to configure a container, a tank, a cooling tower, and the like.
[0002]
[Prior art]
A large container such as a tank is assembled by using a large number of unit plates. As such a unit plate, what is formed into a shallow box-like body having a flange portion standing on the same side on each side of the quadrilateral substrate portion by being integrally formed with fiber reinforced resin is known. Yes.
[0003]
When assembling a tank or the like using the above unit plates, the unit plate is connected and fixed to each other by aligning the flange portions of adjacent unit plates and fastening them through bolts. By tightening the bolts during assembly, and by filling the tank with water, the flange part is attracted to the outer side. Therefore, at the corner part of the unit plate, a force is applied in the direction in which the intersection angle between the flange parts intersecting each other widens. It is done. Due to this force, a small crack may occur inside the corner of the unit plate, that is, the corner where the adjacent flanges meet.
[0004]
[Problems to be solved by the invention]
It is an object of the present invention to prevent as much as possible the occurrence of cracks inside the corners of the unit plate due to bolt fastening during assembly.
[0005]
[Means for Solving the Problems]
(1) In a unit plate that is integrally molded with fiber reinforced resin and formed into a shallow box-like body having a flange portion standing on the same side on each side of the quadrilateral substrate portion,
A notch in which the width of the unit plate gradually decreases from the edge side of the flange portion toward the substrate portion side at the corner where adjacent flange portions meet and the tip of the unit plate is formed in a curved shape. A unit plate made of fiber reinforced resin, characterized in that a portion is provided .
(2) In a unit plate formed integrally with fiber reinforced resin and formed into a shallow box-like body having a flange portion standing on the same side on each side of the quadrilateral substrate portion,
A notch portion is formed in a band shape from the edge side of the flange portion toward the substrate portion side along the ridgeline of the corner portion where the flange portion intersects at the corner portion where the adjacent flange portion intersects the unit plate. A fiber-reinforced resin unit plate, characterized in that a roundness having a diameter equal to or larger than the width of the notch is provided at the tip of the part .
[0006]
[(1) (2) Fiber Reinforced Resin Unit Board]
In relation to the purpose of the present invention to prevent the occurrence of cracks inside the corner of the unit plate as much as possible, (a) in order to suppress the spread of the crossing angle between the flanges that intersect each other in the unit plate, The glass fiber is reinforced to improve the strength. ( B) In order to reduce the resistance to the expansion of the crossing angle between the flanges that intersect with each other, the corners of the unit plate, that is, the corners where the adjacent flanges meet, are formed thinner than the other parts and bolted (C) A groove-like depression is provided on the inner side surface of the corner where adjacent flanges meet (Japanese Utility Model Publication No. 61-26222). There are technologies (a) to (c) above.
[0007]
However, in the case of (i) above, the reinforcing effect by the glass fiber cannot be expected so much, and the flange portion must be made thicker than necessary to prevent the occurrence of cracks. Further, in (b) and (c) , the occurrence of cracks is reduced by increasing the flexibility with respect to the stress due to bolt fastening, but the cracks still occur due to the thin corners. Therefore, in the present invention, unlike the techniques shown in (a) to (c) above, the above technical means are adopted with a focus on avoiding the occurrence of cracks inside the corner portion. is there. The present invention prevents a crack from occurring inside the corner portion by forming a notch portion at a corner portion where adjacent flange portions intersect and escaping the stress concentration generated in the corner portion to the peripheral portion. is there.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 is a fiber-reinforced resin unit plate 1A perspective view of the (1), FIG. 2 is a perspective view of a fiber-reinforced resin unit plate 1B of (2), 3 (a) is 1 in that the form of (1 ) Is a perspective view of a corner portion of the fiber reinforced resin unit plate 1C, FIG. 3B is a plan view thereof, and FIG. 4A is a view of the fiber reinforced resin unit plate 1D of FIG. The perspective view of a corner part and FIG.4 (b) are the top views. In addition, although the board | substrate part 2 demonstrates a square and the standing of the flange part 3 shows an example of a right angle, it is needless to say that it is not restricted to this.
[0009]
As shown in FIGS. 1 and 2, the fiber reinforced resin unit plates 1 </ b> A and 1 </ b> B form a shallow box-like body having flange portions 3 of the same thickness standing on the same side on each side of the quadrilateral substrate portion 2. And is integrally formed of fiber reinforced resin.
[0010]
A notch portion 5 is formed at a corner portion of the unit plate 1, that is, a corner portion where the adjacent flange portions 3 and 3 intersect. The notch 5 shown in FIG. 1 is formed so that the width thereof gradually decreases from the edge side of the flange 3, 3 toward the substrate 2 at the corner where the flange 3, 3 intersects. The tip is formed in a curved shape to prevent the progress of cracks. Normally, the position of the bolt fastening hole when assembling the unit plate 1 is substantially at the center of the height of the flange portion 3, and a gasket for preventing water leakage is provided at a position below the center of the height of the flange portion 3. Therefore, the height “a” of the notch portion 5 is set to ½ or less of the height “b” of the flange portion 3.
[0011]
The notch 5 shown in FIG. 2 is formed linearly along the ridgeline at the corner where the flanges 3 and 3 intersect, that is, in a strip shape, from the edge side of the flanges 3 and 3 toward the substrate 2 side. It is. The width of the notch 5 is not particularly limited, but a narrow width that is not noticeable when the unit plate 1 is assembled is preferable. Moreover, in order to prevent the progress of a crack, it is desirable to provide the roundness which has a diameter more than the width | variety of the notch part 5 at the front-end | tip of the notch part 5. FIG. As in the case of FIG. 1, the position of the bolt fastening hole when assembling the unit plate 1 is generally at the center of the height of the flange portion 3, and below the center of the height of the flange portion 3. Since a gasket for preventing water leakage is inserted, the height a of the notch portion 5 is set to ½ or less of the height b of the flange portion 3.
[0012]
The notch 5 can be formed by using a molding male mold in which a convex portion corresponding to the notch 5 is formed. Alternatively, the cutout portion 5 may be formed by first obtaining the unit plate 1 having no cutout portion 5 and then mechanically processing it.
[0013]
The integral molding with the fiber reinforced resin can be performed by, for example, molding using BMC (bulk molding compound) or molding by a matched die method in addition to SMC.
[0014]
In the above-described fiber reinforced resin unit plate, the flange portion of the corner portion can be formed thicker than the other flange portions.
The fiber reinforced resin unit plates 1C and 1D shown in FIGS. 3 and 4 are formed so that the thickness t of the flange portion 3 at the corner portion where the notch portion 5 is formed is thicker than the thickness l of the other flange portions 3. It is a thing. Other configurations are the same as those of the unit plates 1A and 1B in the above (1) and (2) . By doing in this way, the corner | angular part where the flange parts 3 and 3 cross is strengthened, and the effect which prevents that a crack generate | occur | produces inside a corner part is further improved. The ratio of the thickness t of the flange portion 3 at the corner portion to the thickness l of the other flange portion 3 is not particularly limited, but may be usually twice or less.
[0015]
【Example】
In a conventional manner, a resin compound containing polyester resin, catalyst, calcium carbonate, etc. is impregnated into glass roving chop fibers (length: 25 mm) to produce uncured SMC, and then the SMC is laminated (950 mm square) 4 layers), a continuous strand glass fiber sheet (1050 mm square, 1 sheet) superimposed on one side of the glass fiber sheet surface in a predetermined unit plate-shaped mold ( The unit plate is placed in contact with the male mold, heated and pressurized for 5 minutes at 130 ° C. and 50 kg / cm ² , and a unit plate having a shape of 1000 mm square and a flange height of 70 mm as shown in FIG. Obtained. This was secondarily mechanically processed to obtain unit plates 1A and 1B having the shapes shown in FIGS.
[0016]
In the unit plate 1A, to the height b70mm of the flange portion 3, the height a of the notch 5 10 mm (14% reduction) and the Example 1A (1), the height a of the notch 5 20 mm ( 29% reduction) and the example 1A (2), the height a of the cutout portion 5 have created three 30 mm (43% reduction) and the example 1A (3). Also in the unit plate 1B, with respect to the height b70mm of the flange portion 3, Example 1B (1), which was the height a of the notch 5 10 mm (14% reduction), the height a 20 mm cutout 5 (29 Example 1B (2) , which was reduced by (%), and Example 1B (3) , in which the height a of the notch 5 was 30 mm (43% reduced), were prepared.
[0017]
The strength evaluation of the corner part of the obtained unit plate was performed by fixing one flange part side of the unit plate corner part and bolting the other flange part with a torque wrench, and cracking occurred in the corner part. The measurement was performed by measuring the amount of strain until the process. The results are shown in FIGS. In the unit plate examples 1A (1) to (3) and 1B (1) to (3) , the maximum amount of distortion that causes cracking is the conventional unit plate (processing of notches and the like in the corners of the unit plate). The unit plate which is not applied at all) was 3000 μS, but improved by about 30% or more, exceeding the target strength value of 4000 μS. Furthermore, the strength is expected to be further improved by forming the thickness of the flange portions on both sides of the notch portion to be thicker than the thicknesses of the other flange portions.
[0018]
【The invention's effect】
As described above, according to the fiber reinforced resin unit plate of the present invention, the strength of the corner portion of the unit plate is improved, and cracks are generated inside the corner portion of the unit plate by fastening bolts during assembly. To be reduced. Therefore, it is expected to improve the workability and appearance during tank assembly as well as the quality of the unit plate.
[Brief description of the drawings]
FIG. 1 is a perspective view of a fiber-reinforced resin unit plate 1A of (1).
2 is a perspective view of a fiber-reinforced resin unit plate 1B (2).
3A is a perspective view of a corner portion of a unit plate 1C made of fiber reinforced resin (1) having a different form from FIG. 1, and FIG. 3B is a plan view thereof.
4A is a perspective view of a corner portion of a fiber-reinforced resin unit plate 1D of (2) in a different form from FIG. 2, and FIG. 4B is a plan view thereof.
FIG. 5 is a perspective view of a unit board made of fiber reinforced resin before mechanical processing.
FIG. 6 is a graph showing a relationship between a bolt fastening torque of a unit plate and a generated strain amount.
FIG. 7 is a graph showing a relationship between a bolt fastening torque of a unit plate and a generated strain amount.
[Explanation of symbols]
1A, 1B, 1C, 1D Fiber reinforced resin unit plate 2 Substrate 3 Flange 5 Notch

Claims (2)

In the unit plate formed integrally with fiber reinforced resin and formed into a shallow box-like body having a flange portion standing on the same side on each side of the quadrilateral substrate portion,
A notch in which the width of the unit plate is gradually reduced from the edge side of the flange portion toward the substrate portion side at the corner portion where adjacent flange portions meet and the tip of the unit plate is curved. A unit board made of fiber reinforced resin, characterized in that a portion is provided . In the unit plate formed integrally with fiber reinforced resin and formed into a shallow box-like body having a flange portion standing on the same side on each side of the quadrilateral substrate portion,
A notch portion is formed in a band shape from the edge side of the flange portion toward the substrate portion side along the ridgeline of the corner portion where the flange portion intersects at the corner portion where the adjacent flange portion intersects the unit plate, A fiber-reinforced resin unit plate, characterized in that a roundness having a diameter equal to or larger than the width of the notch is provided at the tip of the portion .

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