JPS64465Y2 - - Google Patents

Description

[Detailed description of the invention] (Prior art) As a method for draining rainwater etc. during rainfall on road bridges such as elevated roads, water on the road surface is drained onto the road shoulder.
One method is to guide this to a drainage basin, the other is to install a guard part as a tire support part on the front upper part of the roadside, and guide it to a steel drainage ditch made of a hollow steel cylinder with a water channel formed inside. is well known.

The former method has been used for a long time, but the latter method was developed by the present inventor in Utility Model No. 48-45443, Utility Model No. 30106-1980, Utility Model No. 30184-1984, and Utility Model Number 50-30184.
It started to be used after proposals for automatic guard and drainage ditches were made in various publications such as No. 30185.

According to the former method, the water to be drained is within the side band V of the road shoulder U as shown in Fig. 4, and flows along the road shoulder with a constant water flow width W, but the water flow rate flowing here is , differs depending on the structure of the road bridge.

The water flow rate of the road shoulder flow is calculated using the Manning formula, and is Q ₁ = 1/n・R ^2/3・I ^1/2・A・f・.

Q ₁ ...Water flow rate ^m3 /sec n...Roughness coefficient Pavement 0.013 R...Diameter depth = Cross-sectional area/Water edge I...Road vertical slope A...Water flow cross-sectional area f...Water flow safety factor Normally 0.8 This road shoulder flow is , the water is guided to a drainage basin installed on the road shoulder, but the size of drainage basin
Because of the positional relationship shown in the figure, the rate of water falling into the drainage basin is usually 0.6 of the water flow rate _Q1 .
That is, the flow rate that can be treated in the drainage basin is Q ₂ =1/n・R ^2/3・I ^1/2・A・f・C.

Q ₂ ...Flow rate that can be treated in the drainage basin ^m3 /sec C...Drainage basin fall rate 0.6 On the other hand, as shown in Figure 6, a guard part as a tire support part is provided at the upper part of the front surface installed on the road shoulder, and a waterway part is installed inward. In the method of guiding rainwater, etc. to a steel drainage ditch Y made of a steel hollow cylindrical body, the flow rate of water flowing through the waterway part of this drainage ditch is: Q ₃ = 1/n・R ^2/3 I ^1/2・A・f.

Q ₃ ... Water flow rate m ³ /sec n... Roughness coefficient SteelZn 0.011 Then, at the end of this water flow, as shown in Figure 7, the end of the drainage channel is covered to stop the flow and drain outlet Z is closed. Since the water can be discharged through the water, the formula for a large-diameter orifice can be applied, and the flow rate flowing down to the drain port Z can be made larger than the water flow rate.

Q ₄ =C・a√2・₀ .

Q ₄ ＞Q ₃ Q ₄ ...Downstream of the end pipe C...Orifice coefficient a...Cross-sectional area of the end pipe (adjustable) g...Gravity acceleration 9.8m/sec H ₀ ...Water depth at the end (adjustable) Therefore, when comparing these two, the water flow rate,
It can be seen that drainage using steel drainage ditches is superior to drainage using road shoulder flow in terms of the amount of flow that can be treated.

(Problems to be solved by the invention) However, in any case, when the water comes into contact with rainfall exceeding the flow rate or the flow rate that can be treated, drainage of the road surface will be hindered. In particular, when a steel drain is used as shown in Figure 7, when the steel drain becomes full, the 8th
As shown in the figure, this will hinder the drainage of water flowing on the road shoulder.

The present invention has been devised to deal with such problems.

[Structure of the idea]

(Means for solving the problem) The above problem can be solved by using both the shoulder flow and the steel drainage ditch. A drainage pipe is installed at the bottom of one end of the steel drainage ditch, which is made of a steel hollow cylinder that forms the waterway, and the water is collected across the flat part above the waterway, which is formed to be almost flush with the road surface. This problem can be solved by providing a steel drainage ditch with a transverse water collection hole, which is characterized by having a transverse water collection hole as a part and protruding together with the hollow part toward the road shoulder side strip.

(Example) FIG. 1 is a perspective view showing a steel drainage ditch with transverse water collection holes according to the present invention.

1 is a steel drainage steel body with transverse water collection holes;
is a guard part 2 as a tire support part on the front upper part.
A water channel portion 3 is formed inwardly to form a steel hollow cylindrical body as a whole. Reference numeral 4 denotes a flat part formed above the water channel part 3 so as to be substantially flush with the road surface, and a water collection hole 5 is provided in the flat part 4.

Reference numeral 6 denotes a transverse water collection part, which is formed by connecting a flat part 4 formed at one end of the main body 1 so as to be almost flush with the road surface, and making a flat part 8 protrude along with a hollow part 7 in the direction of the roadside belt. A transverse water collection hole 9 is provided in the plane part 8.

Reference numeral 10 denotes a drain port, which is provided at the bottom of one end of the main body 1. This drain port 10 is made large enough to handle the flow rate of water flowing through the water channel 3 of the main body 1 and the flow rate falling from the transverse water collection hole 9 of the transverse water collection part 6.

FIG. 2 is a perspective view showing another embodiment of the steel drainage ditch with transverse water collection holes according to the present invention.

The main body 1, as in the embodiment shown earlier, is formed as a hollow steel cylinder as a whole, with a water channel part 3 on the inside and a guard part 2 as a tire support part on the front upper part.
However, the shape of the guard portion 2 is significantly different.

A transverse water collection section 6 and a drainage pipe 10 are also provided at one end of the main body 1, respectively, similarly to the embodiment shown previously.

In addition, in Fig. 1 and Fig. 2, the drain port 10
is shown in cross section, and reference numeral 11 is an anchor.

(Example of use) The steel drainage ditch 1 with transverse water collection holes made as described above can be used together with the steel drainage ditch without the transverse water collection part 6 on the side of a bridge (road bridge) as shown in Fig. 3. installed, and one end is covered.

[Effect of idea]

Since the present invention is constructed as described above, the use of this steel drainage ditch with transverse water collection holes has the following effects.

In other words, when the flow rate of water in the waterway reaches its full state during rain, etc., the road shoulder flow flowing on the road shoulder is handled by the water collection hole in the cross water collection part, and is directly drained without passing through the waterway part of the drainage ditch. It is possible to cause the water to fall to the drain outlet together with the water that has flowed through the water channel, and it is possible to increase the flow rate or rate of falling to the drain outlet.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention;
Figure 3 is a perspective view showing another embodiment, Figure 3 is a perspective view showing a usage example, Figure 4 is an explanatory diagram showing the concept of the conventional bridge shoulder, and Figure 5 is a perspective view showing the flow from the bridge shoulder. Fig. 6 is an explanatory diagram showing the flow rate of a conventional steel drainage ditch, and Fig. 7 is an explanatory diagram showing the concept of the flow end of a steel drainage ditch. 8
The figure is an explanatory diagram showing running water in a steel drainage ditch and road shoulder flow. In the drawings, 1 is the main body, 2 is the guard part, 3 is the water channel part, 4 is the plane part, 5 is the water collection hole, 6 is the cross water collection part, 7 is the hollow part, 8 is the plane part, 9 is the water collection hole, 10
is the drainage outlet, U is the road shoulder, V is the side strip, and W is the water flow width.

Claims (1)

[Scope of utility model registration request] A guard part as a tire support part is provided at the upper part of the front surface, and a drainage pipe is provided at the bottom at one end of the steel drain groove, which is made of a hollow steel cylinder with a water channel formed inside, and is almost flush with the road surface. A steel drainage with a transverse water collection hole, characterized in that the flat part above the waterway part formed in such a manner is used as a transverse water collection part, and a transverse water collection hole is provided and the hollow part and the hollow part protrude toward the road shoulder side strip. groove.