JPS6217258A - Vertical trough - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a downpipe with excellent cold resistance.

[Conventional technology]

Traditionally, downpipes were made of polyvinyl chloride resin, aluminum, copper,
These pipes were formed into a cylindrical shape made of steel, etc., but in cold regions such as Hokkaido, if these pipes were installed outside the house, the rainwater flowing into the pipes would freeze during the winter. In order to prevent this, insulation material was wrapped around the outer circumference of the downpipe, but this was also ineffective on extremely cold days and caused the problem of freeze damage. Therefore, in cold regions,
It was common practice not to install downpipes outside the house.

As a way to solve this problem,
As described in Publication No. 4, an antifreeze heater is attached to the downpipe, and as described in Utility Model Application Publication No. 54-110232, in addition to the antifreeze heater, the outer periphery of the downpipe is installed. It is known that a foamed synthetic resin outer tube is laminated on top of the outer tube.

[Problem that the invention seeks to solve]

However, since the above-mentioned conventional downpipe uses a heater for preventing freezing, the structure becomes complicated because it requires a structural ingenuity to efficiently install the heater, and the electric heating cost increases. However, in the event of a power outage, the anti-freeze heater would not work, causing the downpipe to freeze and break.

The present invention has been made for the purpose of solving the above-mentioned problems of the conventional downpipe, and providing a downpipe that has a simple structure and is free from freeze damage.

[Means for solving problems]

In order to achieve the above object, the present invention has the following configurations:
The gutter is formed by inserting a cylindrical foam body with elasticity and a waterproof layer on the inner peripheral surface into the gutter main body.

[Effect]

Rainwater flows along the waterproof layer on the inner peripheral surface of the cylindrical foam.

Even in winter, since the cylindrical foam body is inserted into the gutter body, the rainwater flowing inside the gutter is insulated and kept warm by the air inside the foam body, making it difficult to freeze.

Even if rainwater freezes and expands in volume within the vertical gutter, the elastic foam will absorb this volumetric expansion and will not destroy the vertical bridge body.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a downpipe according to the present invention.

Reference numeral 1 denotes a gutter, and an elastic cylindrical foam 3 is inserted into the gutter main body 2. A waterproof layer 4 is provided on the inner peripheral surface of the cylindrical foam 3.

The gutter body 2 is normally used as a gutter,
For example, hard PVC resin, aluminum, copper,
It is made of iron or other material into a cylindrical shape.

The cylindrical foam 3 has such elasticity that it can absorb rainwater when it freezes and expands within the downpipe 1. When water freezes and becomes ice, it expands in volume by about 9%, so the foam 3 is preferably one in which the foam layer 31 and waterproof layer 4 are compressed by 10% or more and shrink in volume.

In particular, considering the case where rainwater is trapped and frozen within the downpipe 1, it is preferable to use a material that can be compressed by 5% or more in the direction perpendicular to the axial direction (thickness direction) of the downpipe. The foam 3 has a compression set (JIS K 6767) so that it can withstand repeated freezing and thawing of rainwater.
) is preferably 30% or less.

In addition, in order to prevent rainwater from freezing, the foam layer 31 should preferably have a high heat retention property, and if it is made of synthetic resin, the apparent density is in the range of 0.01 to 0.6 g/ct1. Preferably. The cell structure of the foam layer 31 is as follows:
Closed cell foam has better heat retention than open cell foam.
Also, even if the waterproof layer 4 is damaged, rainwater will not penetrate into the foam layer 31, which is preferable.

The waterproof layer 4 is formed inside the foam layer 31, and is a membrane layer that prevents rainwater from penetrating into the foam layer 31 when it flows through the downpipe 1. The thickness of the waterproof layer 31 is as follows:
Because garbage, etc. flows along with rainwater in the downpipe 1, the strength is 10.
Preferably, the thickness is 0 μm or more.

Further, it is preferable that a surface layer similar to the waterproof layer is provided on the outer peripheral surface of the cylindrical foam 1 as well.

The wall thickness of the cylindrical foam 3 is preferably in the range of 2 m to 25 m, considering the above-mentioned freeze expansion absorption and heat retention properties.

To form this cylindrical foam, for example, polyethylene, polypropylene, polystyrene, polyvinyl chloride,
A synthetic resin such as polyurethane or rubber is formed into a cylindrical shape by extrusion foam molding to form an elastic foam.
A skin layer may be formed on the inner peripheral surface and the outer peripheral surface. Then, the skin layer on the inner peripheral surface becomes the waterproof layer 4.

Alternatively, the waterproof layer 3 may be separately extruded and coated on the inner peripheral surface of the foam layer 31 to form the waterproof layer 3 .

Next, we will explain the results of a freeze-fracture experiment conducted after fabricating a vertical trough.

Example 1 Low-density polyethylene was used as the main raw material, fed to an extruder, dichlorotetrafluoroethane was injected as a blowing agent midway through the extruder, extruded from the extruder into a cylindrical shape, and the inner surface was air-filled from the inside. The mixture was extruded and foamed while being cooled to produce a cylindrical foam.

The cylindrical foam has a closed cell structure, has an inner diameter of 58 mm and a wall thickness of 12 m, and has a 200 μm skin layer as a waterproof layer on the inner circumferential surface and a 100 μm skin layer on the outer circumferential surface. Ta. And the compression in the thickness direction of the foam is 75%.
The compression set was 6%, and the apparent density of the foam layer was 0.05 g/cIa.

This cylindrical foam has an outer diameter of 90 mm and is thick.

It was inserted into a 1 m long gutter main body 2 made of hard polyvinyl chloride resin to form a gutter 1.

Example 2 The cylindrical foam of Example 1 had an outer diameter of 90 m and a wall thickness of 1.0 m.
It was inserted into the vertical bridge body 2 made of aluminum of the crane to form the vertical gutter 1.

On the other hand, as a comparative example, only the gutter main body used in Example 1 was prepared as a gutter, as a comparative example 2, only the gutter main body used in Example 2 was prepared as a gutter, and as a comparative example 3. ,
A down pipe made of hard vinyl chloride resin with an outer diameter of 60 m and a wall thickness of 1.1 mm was prepared, and as Comparative Example 4, a pipe with an outer diameter of 60 m and a wall thickness of 1.1 mm was prepared.
We prepared an Otxr aluminum downpipe.

Then, as shown in Figure 2, these downpipes with a length of 1 m were placed in a container 5 containing water and left at -50°C for 2 hours to freeze about 2ocI11 of the lower part of the downpipe. Ta. Next, a polyethylene foam (apparently density 0.04) with a width of 40Ω and a thickness of about 31Ω was placed as a heat insulating material on the outside of the central part of the downpipe.
The seal was wrapped about 8 times (thickness: about 24 fl), the inside of the pipe was filled with water, and it was left in a -50°C freezer for 17 hours.

As a result, the water in the downpipe begins to freeze from the top, and the insulation material freezes last, leaving no place for the volumetric expansion due to freezing of the insulation material to escape, and the water in Comparative Example I and Comparative Example 3. The down pipes made of hard vinyl chloride resin burst into pieces, and the parts of the down pipes made of aluminum in Comparative Examples 2 and 4 burst with the heat insulating material wrapped around them. However, Example 1
In the downpipe of Example 2, no abnormality was observed on the outer peripheral surface. Furthermore, when we tried to melt the ice inside the downpipes of Examples 1 and 2, no abnormality was found on the inner peripheral surfaces.

Therefore, the above-mentioned freezing and thawing experiment was repeated 30 times for the downpipes of Example 1 and Example 2, but no abnormality was observed on the outer circumferential surface, and there were some defects on the inner circumferential surface of the cylindrical foam. The dents were only visible and did not affect the use of the product.

Next, in Sapporo City, Hokkaido, when the vertical gutters of Example 1 and Example 2 and the vertical gutters of Comparative Example 3 and Comparative Example 4 were installed in a house, in the winter of 1960,
No abnormality was observed in the downpipes of Comparative Example 3 and Comparative Example 4, but rupture was observed in the downpipes of Comparative Examples 3 and 4 due to freezing.

In the above embodiment, a waterproof layer made of the same polyethylene was provided on the inner circumferential surface of the foam layer made of low-density polyethylene, but the waterproof layer may be a separate resin layer having excellent waterproof performance.

〔Effect of the invention〕

As described above, the downpipe of the present invention has an elastic cylindrical foam body provided with a waterproof layer on the inner peripheral surface and inserted into the main body of the downpipe, so that the waterproof layer prevents rainwater from flowing inside the downpipe. flows well, and the foam's insulation and heat retention ability alleviates the freezing of rainwater flowing inside the gutter, and the elasticity of the foam absorbs the volumetric expansion of frozen rainwater, destroying the gutter itself. Never.

Therefore, the downpipe of the present invention can be suitably used in cold regions such as Hokkaido.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the downpipe of the present invention;
The figure is a sectional view illustrating a freezing experiment of a downpipe according to the present invention. DESCRIPTION OF SYMBOLS 1... Downpipe, 2... Downpipe body, 3... Cylindrical foam, 31... Foam layer, 4... Waterproof layer.

Claims (1)

[Scope of Claims] 1. A vertical gutter in which a cylindrical foam body having elasticity and having a waterproof layer provided on the inner peripheral surface is inserted into the vertical gutter body. 2. The vertical gutter according to claim 1, wherein the foam can be compressed by 5% or more in the thickness direction from the waterproof layer side. 3. Claim 1, wherein the foam has a compression set of 30% or less in the thickness direction from the waterproof layer side.
The vertical gutter described in paragraph 2 or paragraph 2. 4. The vertical gutter according to claim 1, 2 or 3, wherein the foam has a closed cell structure. 5. The thickness of the foam is in the range of 2 mm to 25 mm, the thickness of the waterproof layer is 100 μm or more, and the thickness of the protective layer is 2 mm.
The vertical trough according to claim 1, 2, 3, or 4, which has a diameter of 00 μm or more.