JPH09111972A - Structure of gutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost, and to utilize space effectively by forming a recessed falling port having determined inside diameter and depth to the base of a gutter for drainage and connecting a distributing pipe having an inside diameter smaller than the falling port and being extended to a lower section to the base of the falling port. SOLUTION: A gutter 10 is formed in an upward opened U shape in a cross- sectional view, and a falling port 11 is formed at the specified place of a base 10a. The falling port 11 is formed in an approximately cylindrical shape having specified inside diameter D1 and depth. The inside diameter D1 is set at a value smaller than the width of the base 10a of the gutter 10. An opening section is formed at the central section of the base 11a of the falling port 11, and the upper end section of a drain pipe 12 having an inside diameter smaller than the inside diameter D1 of the falling port 11 and being extended to a lower section is connected into the opening section. Rainwater, etc., flowing into the gutter 10 from a roof are flowed into the drain pipe 12 from the falling port 11, and drained. Rainwater flowing into the falling port 11 generates a siphon phenomenon in the falling port 11 and flows into the drain pipe 12 at that time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a drainage gutter provided along, for example, a peripheral portion of a roof of a building.

[0002]

As is well known, in order to drain rainwater and the like,
For example, gutters are installed around the periphery of the roof of the building.
As shown in FIG. 5, such a gutter 1 is installed so as to extend along a direction orthogonal to the drawing and be inclined at a predetermined angle, and a drain pipe 2 extending downward is provided on the bottom surface 1a at the lowest position. It has a connected structure. Then, rainwater and the like that have flowed into the gutter 1 from the roof flow downward along the inclination and are discharged from the drainage pipe 2.

[0003]

However, the conventional gutter structure as described above has the following problems. That is, in order to increase the flow rate of water that can be treated in the gutter 1, it is necessary not only to increase the sectional size of the gutter 1 itself, but also to increase the diameter of the drainage pipes 2 and increase the number thereof. However, these cause problems such as an increase in cost and a decrease in appearance. Furthermore, in particular, the drainage pipe 2 must be arranged so as not to interfere with various columns, beams, equipment, etc. arranged under the roof, so it is space-saving to increase the diameter and the number of pipes. It can be difficult to achieve. The present invention has been made in consideration of the above points, and provides a gutter structure capable of reducing the cost and effectively utilizing the space and increasing the processing flow rate without deteriorating the appearance. The task is to do.

[0004]

The invention according to claim 1 is
A structure for a drainage gutter, wherein a recess-shaped outlet having a defined inner diameter and depth is formed on the bottom surface of the gutter, and an inner diameter smaller than the outlet is formed on the bottom surface of the outlet. It is characterized in that a drain pipe extending downwardly is connected.

According to a second aspect of the present invention, in the structure of the gutter according to the first aspect, a drain member for preventing foreign matter from flowing into the drain pipe is provided on a bottom surface of the outlet. There is.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, examples of the first and second embodiments of the structure of the gutter according to the present invention will be described with reference to FIGS. 1 to 4.

[First Embodiment] As shown in FIG.
The gutter 10 is arranged along a peripheral edge of a roof (not shown) or the like at a predetermined inclination angle in a direction orthogonal to the drawing. The gutter 10 is, for example, U-shaped in cross section and has an opening 11 formed at a predetermined position on its bottom surface 10a. The outlet 11 has a substantially cylindrical shape having a predetermined inner diameter (cross-sectional dimension) D1 and depth, and the inner diameter D1 is set smaller than the width of the bottom surface 10a of the gutter 10. An opening is formed at the center of the bottom surface 11a of the drop opening 11, and the upper end of the drain pipe 12 having an inner diameter smaller than the inner diameter D1 of the drop opening 11 and extending downward is provided there. It is connected.

In the structure of the gutter 10 as described above, rainwater or the like flowing from the roof (not shown) into the gutter 10 flows according to its inclination, and flows into the drain pipe 12 from the outlet 11 to be drained. Has become. At this time, the rainwater that has flowed into the outlet 11 causes a siphon phenomenon in the outlet 11 and flows into the drain pipe 12. The siphon phenomenon here means that the rainwater that has flowed in is the outlet 11
If it accumulates in the drainage pipe 12, it becomes difficult for air to flow into the drainage pipe 12, so that the water in the drainage pipe 12 becomes close to a vacuum state that does not contain air bubbles. This is a phenomenon in which the force of pulling water increases and water easily flows.

[Second Embodiment] Next, an example of a second embodiment of the structure of the gutter according to the present invention will be described. As shown in FIG. 2, similarly to the gutter 10 shown in FIG. 1, the gutter 20 is arranged at a predetermined inclination angle along the peripheral portion of the roof (not shown), and the gutter 20 is provided at a predetermined position on the bottom surface 20a thereof. An outlet 21 having an inner diameter D1 smaller than the width of the bottom surface 20a of 20
The drainage pipe 12 having an inner diameter D2 smaller than the inner diameter D1 of the drop opening 21 is connected to the bottom surface 21a of the drop opening 21. And the bottom surface 21 of the outlet 21
A drain member 22 such as a so-called roof drain is provided in a so as to cover the upper end of the drain pipe 12 and prevent foreign matter from flowing in. That is, the gutter 20 shown here
1 and the structure of the gutter 10 shown in FIG. 1 are different only in the presence or absence of the drain member 22.

Even in such a structure of the gutter 20, rainwater or the like flowing from the roof (not shown) into the gutter 20 flows into the drainage pipe 12 through the drain port 22 through the drain 21 and is drained. ing. At this time, outlet 2
The rainwater flowing into 1 causes a siphon phenomenon in the outlet 21 and flows into the drain pipe 12.

[Experimental Example] Next, in order to confirm the treatment performance of rainwater and the like in the gutter 10 of the first embodiment shown in FIG. 1 and the gutter 20 of the second embodiment shown in FIG. The experiment results were shown below. In this experiment, the inner diameter D1 of the outlets 11 and 21 was set to D1 = 0.2 (m), and the depth of the outlets 11 and 21, that is, the outlet 11,
21 from the bottom surface 11a, 21a to the gutter 10, 20 bottom surface 10
The height H1 between a and 20a was set to H1 = 0.15 (m), and the inner diameter D2 of the drain pipe 12 was set to D2 = 0.048 (m). Further, since it is difficult to measure the flow rate with the gutters 10 and 20 having a normal shape, instead of the gutters 10 and 20, a water tank 10 ′ having a horizontal cross-sectional dimension of 1.1 m × 0.6 m. , 20 'were used. Then, under such conditions, the outlets 11, 21 from the water tanks 10 ', 20'
Water is drained to the drain pipe 12 via the
The height from the bottom surfaces 11a, 21a of 21 to the water surface) is 0.
The time required to decrease from 35 m to 0.25 m was measured.

Then, as a result of the experiment, as shown in FIG.
In any case of the gutters 10 and 20, in other words, the water head h is 0.35 regardless of the presence or absence of the drain member 22.
It took 6.5 seconds to decrease from m to 0.25 m.

The flow coefficient was calculated based on the results of this experiment. Here, the relationship between the flow rate Q flowing into the pipe and the flow rate coefficient C is generally expressed by the following equation. Q (m ³ / S) = C · A · V = C · A · (2gh) ^1/2 where C is the flow coefficient, A is the cross-sectional area of the drainage pipe 12 (m ² ), V is the flow velocity (m / s), g; acceleration of gravity (m /
S ² ), h; head (m)

In the water tanks 10 'and 20', the water amount when the head h falls from 0.35 m to 0.25 m is 1.1.
Since m × 0.6 m × 0.1 m = 0.066 (m ³ ), the flow rate Q at this time is Q = 0.066 ÷ 6.5 = 0.010 (m ³ / S). In addition, the cross-sectional area A of the drainage pipe 12 under the above conditions
Is A = 0.018 (m ² ). Further, the water head h is averaged at the start and end of the measurement to be h = 0.3 (m). Then, the above values are used as the flow rate Q and the flow rate coefficient C.
Substituting into the relational expression of and, C = 2.31 is calculated.

The results of this experiment and the conventional gutter 1 shown in FIG.
Compare with the performance of. In the conventional gutter 1, the flow coefficient C
Is generally about C = 0.6. Here, since the gutter 1 does not have the outlets 11 and 21, the water head h is 0.2 m to 0.1 m (the outlets 11 and 21).
1 bottom surface 11a, 21a to gutter 10, 20 bottom surface 10
The flow rate Q'when the height H1 (= 0.15 m is subtracted from the height between a and 20a) is calculated. At this time, the inner diameter D2 'of the drainage pipe 2 is set to D2' = 0.048 m like the drainage pipe 12. Further, the water head h to be substituted into the above relational expression is an average at the start and end of the measurement and is set to h = 0.15 (m). Then, Q ′ = C · A · (2gh) ^1/2 = 0.6 × 0.0018 × 1.71 = 0.0019 (m
³ / S).

From the above comparison, it is clear that, as shown in FIG. 5, in the gutters 10 and 20, the flow rate coefficient C and the flow rate Q are significantly increased as compared with the conventional gutter 1.

As is clear from the above experimental results,
Since the gutters 10 and 20 are provided with the outlets 11 and 21 which are smaller than the gutters 10 and 20 and have a larger cross-sectional dimension than the drain pipe 12, the drainage ports 11 and 21 are used for draining.
Due to the siphon phenomenon that occurs in No. 1, the flow rate of water that can be treated can be significantly increased as compared with the conventional case. Therefore, the treatment capacity can be improved without increasing the diameter or the number of the drainage pipes 12, which can prevent problems such as an increase in cost and a decrease in appearance, and can prevent various pillars and beams arranged below. Alternatively, it is possible to effectively utilize the space without interfering with the facilities and the like.

In each of the above embodiments, the gutter 1
Nos. 0 and 20 do not have to be along the peripheral edge of the roof, and the same can be applied to drainage grooves provided along the edge of the veranda. Further, the cross-sectional dimensions and depths of the outlets 11 and 21 are not limited to the numerical values mentioned in each of the above-mentioned embodiments, and may be set appropriately according to the required processing capacity.

[0019]

As described above, according to the structure of the gutter according to the first aspect of the present invention, the recessed outlet having the inner diameter and the depth defined on the bottom surface of the gutter is formed, and the outlet of the outlet is formed. A drain pipe having an inner diameter smaller than that of the outlet and extending downward is connected to the bottom surface. Further, according to the structure of the gutter according to claim 2, the drain member is provided on the bottom surface of the outlet. With such a gutter structure, the flow rate of water that can be treated can be significantly increased compared to the conventional case due to the siphon phenomenon that occurs at the outlet when draining. Therefore, it is possible to improve the treatment capacity without increasing the diameter and number of drainage pipes, suppress the increase in cost and the deterioration of appearance, and interfere with the various columns, beams, equipment, etc. arranged below. It is possible to make effective use of space without doing so.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of a gutter structure according to the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the structure of the gutter according to the present invention.

FIG. 3 is a table showing experimental results of flow rates in the first and second embodiments of the gutter structure according to the present invention.

FIG. 4 is a comparison table of the experimental results.

FIG. 5 is a vertical cross-sectional view showing an example of the structure of a conventional gutter.

[Explanation of symbols]

 10,20 Gutter 11,21 Drop port 12 Drain pipe 22 Drain member

Claims (2)

[Claims] 1. A drainage gutter structure, wherein a recess-shaped outlet having a defined inner diameter and depth is formed on the bottom of the gutter, and the bottom of the outlet is formed from the outlet. The structure of the gutter, which has a small inner diameter and is connected to a drain pipe extending downward. 2. The gutter structure according to claim 1, wherein a drain member for preventing foreign matter from flowing into the drain pipe is provided on a bottom surface of the outlet.