JPH04192Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a down pipe with excellent cold resistance.

[Conventional technology]

Traditionally, downpipes were made of polyvinyl chloride resin, aluminum, copper, iron, etc. in a cylindrical shape, but in cold regions such as Hokkaido, when these downpipes are installed outside the house, In the winter, rainwater flowing into the downpipes freezes and expands, destroying the downpipes. In an attempt to prevent this, insulation material was wrapped around the outer circumference of the downpipe, but
This was also ineffective on extremely cold days, resulting in freezing and destruction. Therefore, in cold regions, it was common not to install downpipes outside houses.

As a way to solve this problem,
As described in Publication No. 9614, an antifreeze heater is installed on the downpipe, and
As described in the above publication, in addition to antifreeze heaters, there is also known a structure in which a foamed synthetic resin outer pipe is laminated around the outer periphery of a downpipe.

[Problem that the invention attempts to solve]

However, since the above-mentioned conventional downpipe uses a heater for preventing freezing, the structure becomes complicated as 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.

This invention was made with the aim of solving the above-mentioned problems of the conventional downpipe, and providing a downpipe with a simple structure and no fear of freeze damage.

[Means for solving problems]

In order to achieve the above object, this invention has a configuration in which a plurality of holes are opened in a staggered manner along the longitudinal direction of the downpipe main body, and the plurality of holes have a diameter of 4 cm to 40 cm.
A cold-resistant downpipe with holes spaced at cm intervals and an inner diameter of 1 mm to 20 mm was prepared.

[Effect]

Even if rainwater freezes and expands in volume within the downpipe, the multiple holes absorb this volumetric expansion.

In other words, freeze failure of a downpipe occurs when the upper and lower parts of the downpipe freeze first, and when unfrozen rainwater is contained in the middle part, when the rainwater in the middle freezes, there is no place for volumetric expansion to escape. This was often caused by pushing the gutter outwards and destroying the gutter.

With this design, even if the inside of the top and bottom of the downpipe freezes first, the rainwater in the middle will flow out through the multiple holes, so the rainwater will not be contained and will not freeze. However, the downpipe will not be destroyed. In addition, since the vertical intervals between the plurality of holes are set in a range of about 1 cm to 40 cm, the strength of the main body of the trough does not decrease and freeze damage does not occur. and,
Since the inner diameter of the hole is in the range of 1 mm to 20 mm, the strength of the main body of the downpipe is not reduced, and the outflow of contained rainwater is not obstructed. In addition, since the holes are formed in a staggered pattern, there is no need to worry about the strength of the gutter body decreasing.

〔Example〕

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 1 is a rear view showing an embodiment of the downpipe of this invention.

Reference numeral 1 denotes a vertical gutter, and a plurality of holes 3 are opened in a vertical gutter main body 2 along its longitudinal direction.

The gutter main body 2 is normally used as a gutter, and is formed into a cylindrical shape from, for example, hard polyvinyl chloride resin, aluminum, copper, iron, or the like.

As shown in FIG. 3, the gutter main body 2 has a substantially octagonal horizontal cross section, and the four corners thereof are recessed inward in an arc shape to form a recess 21. Of this recess 21, a plurality of holes 3, 3... are formed in a staggered manner in two recesses 21, 21 on the side of the outer wall 4 of the building.

A plurality of holes 3, 3, .

The vertical distance between the multiple holes 3, 3 is approximately 1 cm ~
It is made in a range of 40cm. If the interval between the holes 3 is too narrow, the strength of the gutter body 2 will be reduced, and if the interval is too wide, the effect of preventing freeze damage of the gutter 1 will be reduced.

The inner diameter of the hole 3 is in the range of 1 mm to 20 mm. If the inner diameter of the hole 3 is too small, there is a risk of impeding outflow when rainwater is trapped in the gutter body 2, and if the inner diameter of the hole 3 is too large, the strength of the gutter body 2 will be reduced.

As described above, the holes 3 are formed in a staggered manner in the gutter body 2 in order to prevent the outflow of rainwater and the strength of the gutter body 2.

When water freezes and turns into ice, it expands in volume by about 9%, so it is better to use a non-circular polygonal shape, such as the approximately octagonal horizontal cross section, for the downpipe main body 2. It is preferable because it has enough room to absorb volumetric expansion within its elastic deformation range.

The downpipe 1 configured as described above is attached to a house as shown in FIG. 2.

In the winter, if the lower part of the downspout 1 is sealed and frozen due to snow accumulation, rainwater will flow into the downpipe 1 after that, but the holes 3, 3, etc. in the downpipe 1 are Since the holes 3, 3, etc. are open, there is no possibility that the water will flow out from the holes 3, 3, and become contained. Therefore, the downpipe 1 will not be destroyed due to volumetric expansion due to freezing of rainwater.

In the above embodiment, the holes 3, 3... are connected to the gutter body 2.
The holes 3, 3... may be formed only in the middle part of the gutter body 2, where freeze failure often occurs.

Next, we will explain the results of constructing a vertical trough and performing freeze-fracture experiments.

The downpipe main body 2 has a horizontal cross section as shown in Fig. 3, an outer diameter of 60 mm in Fig. 1, and a wall thickness of 1.1 mm.
mm hard polyvinyl chloride resin, holes 3 with an inner diameter of 5 mm were alternately opened in the two recesses 21 in a staggered manner at a vertical interval of 20 cm (for one recess 21, the vertical interval was 40 cm). Gutter 1 (Example 1) was prepared.

Further, a gutter body 2 made of aluminum was used to prepare a gutter 1 (Example 2) having the same shape as that of Example 1 described above.

On the other hand, as Comparative Example 1, a gutter without holes in the gutter body 2 used in Example 1 was prepared,
As Comparative Example 2, a gutter without holes in the gutter body 2 used in Example 2 was prepared, and Comparative Example 3
We prepared a vertical pipe made of hard vinyl chloride resin with a circular horizontal cross section, an outer diameter of 60 mm, and a wall thickness of 1.1 mm.
As Comparative Example 4, the horizontal cross section is circular and the outer diameter is
An aluminum downpipe with a length of 60 mm and a wall thickness of 1.0 mm was prepared.

Then, put these 1 m long downpipes into a container 5 filled with water, stand them vertically, and heat them at -50℃ for 2 hours.
After leaving it for a while, the bottom 20cm of the downpipe was frozen.
Next, a polyethylene foam (apparent density 0.04 g/cm ³ ) with a width of 40 mm was placed on the outside of the central part of the downpipe as an insulating material.
A 3mm thick tube was wrapped around 8 times (approximately 24mm thick) and water was poured into the pipe until it was full. Comparative Examples 1 to 4 were filled with water, but in Examples 1 and 2, water was gradually flowing out from the holes 3, and the water continued to decrease.

Then, the product in this state was left in a -50°C freezer for 17 hours.

As a result, the water in the downpipe freezes starting from the top and ending with the insulation.
There was no escape for the volumetric expansion caused by freezing of the insulation material, and the hard PVC resin pipe of Comparative Example 3 burst into pieces, and the aluminum pipe of Comparative Example 4 burst at the part where the insulation material was wrapped. did. In the downpipes of Comparative Example 1 and Comparative Example 2, the heat insulating material part was whitened and deformed and cracked.

However, in the downpipes of Examples 1 and 2, although the water in the upper part of the inside of the downpipe flowed out and the lower part was frozen, no abnormality was observed on the outer peripheral surface of the downpipe. 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.

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 the downpipes of Comparative Examples 3 and 4 burst due to freezing.

[Effect of idea]

As described above, in the gutter of this invention, a plurality of holes are opened in a staggered manner along the longitudinal direction of the gutter body, the plurality of holes are spaced at intervals of 4 cm to 40 cm, and the inner diameter of the holes is 1 mm. Since the diameter is 20 mm, rainwater will not be trapped inside the downpipe, and therefore the downpipe will not be destroyed due to volumetric expansion due to freezing of rainwater.

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

[Brief explanation of the drawing]

Fig. 1 is a rear view showing an embodiment of the gutter of this invention, Fig. 2 is a side view showing the gutter of Fig. 1 installed in a house, and Fig. 3 is indicated by the - line in Fig. 2. FIG. 1... Downpipe, 2... Downpipe main body, 21... Recessed part,
3...hole.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A plurality of holes are opened in the main body of the downpipe in a staggered manner along its longitudinal direction, and the plurality of holes are 4 cm to 40 cm long.
A cold-resistant downpipe whose holes are spaced apart and have an inner diameter of 1 mm to 20 mm. (2) The cold-resistant gutter according to claim 1, wherein the gutter body has a horizontal cross-sectional shape of a polygon.