JPS58195617A - Gate with siphon - Google Patents

Abstract

PURPOSE:To prevent the occurrence of noise as well as secure the sufficient effluence capacity of a gate by a method in which a siphon-type water channel is provided from the middle of the upstream side of the gate door to the downstream side through the upper end and water sucked up from the middle of the upstream side is discharged to the downstream side. CONSTITUTION:The door 1 of a falling gate is supported in a freely rising and manner on a bearing (not illustrated) provided to the river bed 2 by using a shaft 4, and a siphon-type water channel 5 of an angular cross section is provided bendwise from the middle of the upstream side of the door 1 to the downstream side through the upper end. When the water level on the upstream side rises under the condition that the door 1 is in maximumly risen state, water flows into the water channel 5 from an inlet 8, and the water level in the water channel 5 rises as the water level on the upstream side rises. When the water level exceeds the horizontal line L, overflow starts inside the water channel 5 and water coming from the inlet 8 is discharged from an outlet 6. When the water level is further raised, the water channel 5 also becomes filled with water from the lower side, a siphonic action starts, and effluent amount is abruptly increased. However, noise caused by falling of water does not occur because of small head.

Description

[Detailed description of the invention] In a tipped gate installed as a weir on a river, the water level on the upstream side is a constant value (generally 0.3
~0.5 m) The gate remains upright until the water reaches a high specified water level to allow water to overflow, and when the water level on the upstream side rises above the specified water level due to flooding, the gate is lowered to allow water to flow out.

Therefore, in normal times, water is allowed to overflow from -L of the door body in the upright state for a long time, resulting in a large head, which often causes noise pollution due to the sound of falling water.

In order to solve the drawbacks of the tilting gate as described above, this invention uses a siphon to discharge water from a low position to the downstream side, thereby preventing noise and ensuring sufficient discharge capacity. The purpose of this invention is to provide a gate, but it can be used not only for a tilting gate but also for a vertically lifting type roller gate.

The details of this invention will be explained below based on an embodiment shown in the accompanying drawings.

In Figs. 1 and 2, 1 is the gate body of the tipping gate, the lower end of which is supported in a bearing provided in the river bed 2 by means of a support 4, and this part is kept watertight by a seal 3. There is.

Reference numeral 5 denotes a siphon-type flow path, and in the illustrated example, the cross section 2140 is rectangular as shown. As shown in Fig. 1, this flow path 5 starts from the middle part of the upstream side of the door body 1, passes through the upper end of the door body 1, is provided along the downstream side, and flows toward the downstream side near the lower end of the downstream side of the door body 1. It is bent and opened to form a discharge port 6.

In addition, the lower end of the upstream portion of the flow path 5 is tied by the end plate 7, and a portion 9 [18] slightly beyond this lower end is provided, and furthermore, the door body 1 is erected to the maximum. In this state, a wallet-on breaker hole 9 is provided in a portion close to a horizontal line passing through the top end of the door body 1.

In the illustrated case, a large number of siphon-type channels 5 are provided at regular intervals as shown in FIG. Prevent overflow from areas without water.

Note that the siphon type flow path 5 may be provided along the entire length of the door body 1. In addition, in the case of the embodiment shown in FIG.
The end plate 7 can be omitted and the spout 8 can be made as shown in FIGS. 3 and 4, which will be described later.

The gate with a siphon of the present invention has the above-mentioned construction, and the raising and lowering of the gate body 1 is carried out by raising and lowering it by means of a hydraulic cylinder provided on the river bed on the downstream side.

Now, when the door body 1 is in its maximum upright position as shown in Fig. 1, as the water level on the upstream side rises, water flows into the channel 5 from the spout 8, and the water level on the upstream side rises. At the same time, the water level in the channel 5 also rises by 1, and when the water surface exceeds the horizontal line shown in Figure 1, overflow begins in the channel 5, and the water entering from the channel 5 passes through the channel 5 and is discharged. It is discharged downstream from the outlet 6.

Furthermore, when the water surface rises and the amount of water flowing through the channel 5 increases, the flow channel 5 starts to become full from the lower part on the downstream side.
Eventually, the entire channel 5 becomes full of water, and discharge by the siphon action begins.

In this case, due to the siphon action, the amount of discharge increases dramatically compared to simple overflow. Therefore, when a large number of channels 5 are provided at regular intervals as in the illustrated example, the total number of channels 5 is l
'' is 5 to 5 of the total length of the door body 1, the discharge amount comparable to the overflow amount when overflowing from the entire length of the conventional door body can be achieved by discharging water only from the flow path 5.

::1.

Next, when the upstream water level decreases and the water level falls below the first siphon breaker hole 9, air is sucked into the channel 5 from here, making it impossible to maintain the full water state in the channel 5, and the siphon action is lost. The discharge will be stopped.

Figures 3 and 4 show an example in which the present invention is applied to a vertically lifting type roller gate, in which 11 is a door body, and the lower end thereof has a hinge 13 that comes into close contact with the riverbed 12 when descending. .

Reference numeral 15 denotes a siphon type flow path, and although the cross section is not shown in the case of FIG. 3, it has a rectangular shape almost the same as the example of FIG. 2, and a plurality of them are arranged at regular intervals. This flow path 15 starts from the spout 17 in the middle of the door body 11σ]- on the flow side, passes through the upper end of the door body 1 (7-), and is provided along the lower end side of the door body 1, as in the example shown in FIG. Discharge port 1 is opened near the lower end on the downstream side.
It is 6.

Although not shown, the cross section of the siphon-type discharge channel 15 in the case of FIG. 4 is provided over the entire length of the door body 11. Similar to the example shown in FIG. A discharge port 16 is opened further downstream.

Reference numeral 18 denotes a siphon-on breaker hole provided at a portion slightly below the top of the door body 11.

Reference numeral 19 in FIG. 3 denotes a water shielding plate identified between each flow path 15 to prevent overflow from a portion where there is no flow path 15, but the siphon type flow path 15 is provided over the entire length of the door body 11. It's also possible. It goes without saying that the spout 8.17 is provided with a screen bar to prevent dust from entering.

In the case of this embodiment as well, when the gasket 13 at the lower end of the door body 11 is in close contact with the riverbed 12 as shown in FIGS. 3 and 4, as the water level on the first stream side rises by -1-, When water flows into the flow path 15 from the spout 17 and exceeds one end of the door body 11, overflow in the flow path begins, and the water that entered the flow path 15 from the spout 17 flows into the flow path 16. It is discharged further downstream.

Furthermore, as the water level rises and the amount of water flowing through the flow path 15 increases, the flow path 15 begins to become full from the lower part, and finally the entire flow path 15 becomes full of water and discharge by the siphon action begins. The amount of discharge increases dramatically.

Next, when the upstream water level drops to below the siphon breaker hole 18, air is sucked into the channel 15 from the hole 18, the siphon action is lost, and the discharge is stopped.

In the gate with a siphon of this invention, the overflow water passes through the siphon type flow path and is discharged downstream from the discharge port at the lower end, as described in 1. Compared to the case where the overflow water is discharged from the upper end of the gate body. The head difference is significantly smaller, and no noise pollution is caused by the sound of falling water even if the water is allowed to overflow for a long time. Furthermore, by utilizing the siphon effect, sufficient discharge capacity can be obtained even though there is little noise.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional side view of a tilting gate in which the present invention is implemented, Fig. 2 is a cross-sectional plan view taken along the line A-A in Fig. 1, and Figs. 3 and 4 are longitudinal cross-sectional views showing an example of implementation in a roller gate. FIG. α 1.11...door body, 5.15...+1. IFON type flow path, 6.16...discharge port, 8.17... spout. Patent Applicant: Kurimoto Iron Works Co., Ltd. Same Agent: Kama 1) Text 2nd 2nd En 193- Go > 10 1'

Claims (1)

[Claims] A gate with a siphon installed along the downstream side from the middle part of the gate body through the -L end of the gate body, and equipped with a siphon-type flow path that discharges water sucked in from the middle part of the stream side to the downstream side. .