JPS6253662B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a plate-like body for eaves gutters, in which a corrugated metal plate is embedded in a synthetic resin plate-like body while retaining residual stress.

[Background technology]

In the case of an eave gutter B' formed by roll forming a synthetic resin eave gutter plate A' in which a flat metal plate 1 is embedded than before, the eave gutter B' is formed as shown in Fig. 1. Waviness or bulges, so-called bulges, had formed in the center of the bottom wall and the center of the side walls. This is because when roll forming, the outer side of the corner part of eaves gutter B' stretches and the inner part contracts, causing the corner part to shrink in the longitudinal direction.
This is because the center part of the bottom wall and the center part of the side wall of B' do not shrink. Experience has shown that this phenomenon is noticeable when the width w of the eaves gutter B' and the thickness t of the metal plate 1 are w/t≧750.

[Purpose of the invention]

The present invention enables eaves gutters to be formed without forming so-called bulges in eaves gutters even when formed by roll forming, and even when using a thin metal plate, the eaves can exhibit strength greater than its thickness. An object of the present invention is to provide a plate-like body for a gutter.

[Disclosure of the invention]

(Structure) The plate-like body for eaves gutters of the present invention has a corrugated metal plate 2 formed by corrugating a long metal plate 1 along the width direction over the entire length in the longitudinal direction. The synthetic resin 3 coats the corrugated metal plate 2 onto a long plate-like body 4 made of synthetic resin 3 by coating the corrugated metal plate 2 with synthetic resin.
The corrugated metal plate 2 is buried with residual stress maintained by the resin pressure, and when the eaves gutter B is formed by roll forming due to the residual stress of the corrugated metal plate 2, cracks may also occur. However, the above object of the present invention was achieved.

(Example) 1 is a metal plate such as steel, and the thickness is 0.14 mm.
It is. This metal plate 1 is corrugated in a triangular shape along the width direction to form a corrugated metal plate 2. The height h of the corrugated portion 5 of the corrugated metal plate 2 is 0.5 mm. This corrugated metal plate 2 is embedded in an elongated plate-like body 4 made of synthetic resin 3 such as vinyl chloride resin and having ears 6 at the longitudinal side ends to a thickness of 1.1 mm.
A plate-like body A for eaves gutter of mm is formed. The corrugated metal plate 2 is embedded in the plate-like body 4 by coating both sides of the corrugated metal plate 2 with synthetic resin 3. In this case, due to the resin pressure, the height h of the corrugated portion 5 of the corrugated metal plate 2 is lowered from 0.5 mm in the normal state to h' = 0.3 to 0.4 mm, and after burying the corrugated metal plate 2, the height h of the corrugated portion 5 of the corrugated metal plate 2 is reduced to 0.5 mm. This results in the retention of residual stress that attempts to restore itself. In addition, the synthetic resin 3 to be coated is
The corrugated metal plate 2 can be buried so as to be located at the center of the cross section of the plate-like body 3 by relieving the pressure from both directions of a and the valley 5b, and variations in the thickness of the upper and lower parts of the corrugated metal plate 2 are reduced. The strength increases as well.
The eaves gutter B is formed by roll forming the eaves gutter plate A thus formed. In this case, the corrugated metal plate 2 exhibits strength greater than its actual thickness due to the corrugated portion 5, and the residual stress it maintains increases the bending strength (or buckling stress) of the eaves gutter plate A.
becomes large, and the formed eaves gutter B has no so-called bulges at all. This means that even though the thickness t of the metal plate 1 is 0.14 mm in this embodiment, by corrugating it,
The strength is the same as that of 0.33mm, so w/t=
This can be understood from the fact that 111/0.33=336. Note that if the ridges 5a and troughs 5b of the corrugated portion 5 of the corrugated metal plate 4 are made thicker and the slopes are made thinner, the actual strength will be further increased. FIG. 5 shows another embodiment of the present invention, in which a primary synthetic resin layer 7 is coated along the corrugated portions 5 of the corrugated metal plate 2, and then embedded in a synthetic resin plate-like body 4. A plate-like body A is formed.

〔Effect of the invention〕

In the present invention, by coating a corrugated metal plate formed by corrugating a long metal plate along the width direction with synthetic resin 3, the corrugated metal plate is shaped into a long plate made of synthetic resin. Since it is buried in the body, the synthetic resin that covers it relieves pressure from both the peaks and valleys of the corrugated metal plate and positions the corrugated metal plate at the center of the cross section of the synthetic resin plate. It can be buried uniformly, and even if a thin metal plate is used, it can exhibit strength greater than its thickness, and it can provide a lightweight and strong plate for eaves gutters. Since the board is buried with residual stress maintained by the resin pressure of the synthetic resin that covers the board, the bending strength is increased and so-called bulges do not occur even when eaves gutters are formed by roll forming. It is something.

[Brief explanation of the drawing]

Fig. 1a is a perspective view showing an eaves gutter formed using a conventional example, Fig. 1b is a sectional view taken along line XX in Fig. 1a,
The figure is a partially cutaway perspective view showing one embodiment of the present invention, and FIG. 3 is a perspective view showing a corrugated metal plate in the same as above.
FIG. 4 is a sectional view showing an eaves gutter formed using the same method as above, and FIG. 5 is a sectional view showing another embodiment of the present invention. A... Plate-shaped body for eaves gutter, B... Eaves gutter, 1... Metal plate, 2... Corrugated metal plate, 3... Synthetic resin, 4...
...Plate body.

Claims (1)

[Claims] 1 A corrugated metal plate is formed by corrugating a long metal plate along the width direction over the entire length in the longitudinal direction, and the corrugated metal plate is made of synthetic resin by coating the corrugated metal plate with a synthetic resin. 1. A plate-like body for an eaves gutter, characterized in that the elongated plate-like body is buried in a state where residual stress is maintained by the resin pressure of a synthetic resin coated on the long plate-like body.