JPS60123612A - Noise prevention gate - Google Patents

Abstract

PURPOSE:To prevent running water noise by a method that a raceway having an inlet on the top and outlet on the bottom is installed in almost full length of a span on the upper stream side of a door structure, and the raceway is vertically partitioned by many parting boards, and the outlet is open from the bottom of the door structure to the downstream. CONSTITUTION:Providing that a watertight rubber 26 is stuck to a riverbed 2, when a water level in the upper stream rises and crosses a bending line 22, a stream flows into an inlet 21, and flows down through a raceway 20 divided by parting boards 19, and is discharged from an outlet 25 to the downward of a door structure 11. As the stream entirely flows into the raceway 20 through the inlet 21, even in case that the water level rises above the top of the structure 11, an overflow does not occur up to a certain extent. Therefore, noise is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a noise prevention gate that reduces noise in a gate that discharges overflow from the top of the gate body in the event of a small flood.

FIG. 1 shows a general side view of a conventional overflow gate, with reference numeral 1 indicating the gate body, 2 indicating the river bed, and 3 indicating the watertight rubber at the lower end of the gate body 1.

Such an overflow gate is placed on the riverbed 2 in a closed state to store upstream water, and by maintaining the stored water level at a certain fixed water level, the water is taken in from a water intake (not shown) as agricultural water or the like.

In such a case, if the water level rises higher than the top of the gate 1 due to a minor flood, overflow is discharged from the top of the gate 1 to temporarily reduce the minor flood flow without opening the gate. may flow down. In addition, it is possible to increase water intake 11 or secure water intake further upstream by raising the water intake level periodically rather than by flooding.
In such a case, the intake water level becomes higher than the height of the door body 1, causing overflow discharge from the top of the door body 1, and at that time,
Noise is generated, but in urban areas this noise has become a problem as it has a large impact on the environment.

The cause of the noise is that the water that has flowed over the top of the door falls freely from the rear of the top of the door, resulting in a large drop, which increases the falling energy, and the water that is scattered during the fall. However, the ice falls in the form of countless small ice blocks, and when each ice block collides with the riverbed, it makes a collision sound, and this collision sound is generated in the open downstream area and spreads to the left and right and upward, making a large impact sound. This is because it becomes sound and spreads.

Therefore, the most effective means to prevent noise at such gates is to prevent water from overflowing from the top.

In view of the above point, the present invention provides a noise prevention gate that prevents water from overflowing from the top of the gate body even in the event of a small flood.

That is, this invention has an inlet at the upper part on the upstream side of the door body,
A span of a water conduit with an outlet at the bottom.

The water conduit is provided over the entire length of the door, and this water conduit is cut off by a number of longitudinal partition plates, and the opening is opened downstream from the lower part of the door body.

Since the noise prevention gate of the present invention has the above-mentioned configuration, when it is in the grounded state, the watertight rubber at the lower edge of the front plate constituting the headrace is in close contact with the riverbed, and the headrace is located between the bottom plate of the gate body and the riverbed. The drain hole at the bottom of the is connected.

Therefore, water that attempts to overflow over the door body flows into the water conduit from the inlet before reaching the top of the door body, flows down the water conduit, exits from the discharge port at the lower end, and exits the water conduit. It passes through the lower part of the body and flows downstream.

As mentioned above, all the water does not overflow the gate body, but descends in the conduit in a full state, and is rectified by a large number of partition plates before flowing down. Therefore, since there is no free fall from a high head like in the conventional case, the falling energy is reduced, the scattering of water is restricted, and the formation of ice blocks is suppressed.

Furthermore, since the outlet of the water conduit is located on the upstream side of the lower part of the door body, even if a collision sound occurs, this sound will not spread widely.

Therefore, there is a unique effect of extremely quiet discharge.

Embodiments of the noise prevention gate of the present invention will be described below with reference to FIGS. 2 to 4 of the accompanying drawings.

11 is a door body, which includes an upstream plate 12, a top plate 13, a back plate 14,
It has a known structure consisting of a bottom plate 15 and a plurality of frame-shaped reinforcing plates 16 fixed inside.

An outer plate 18 is disposed on the outside of the upstream plate 12 with an appropriate gap, and the dust plate 18 and the upstream plate 12 are integrally connected by a number of partition plates 19. This partition plate 19 is the upstream plate 1
2 and the outer surface plate 18 is divided into a plurality of sections.

The upper end of the outer plate 18 is slightly lower than the upper end of the door body 11 and bent forward as a bent edge 22 to form an inlet 21, and a screen bar is lined up and fixed to this part to prevent the inflow of garbage. A blocking screen 23 is provided.

The lower end of the outer plate 18 is made to protrude below the door body 11 as shown in FIG.
shall be. Further, a water-tight rubber 26 that is in close contact with the river bed X2 is fixed to the lower end of the outer surface plate 1 with a rubber presser, and a deflector 27 is fixed to the upper part of this water-tight rubber 26 by welding or the like.

Reference numeral 28 designates a plurality of reinforcing plates provided from the lower end of the partition plate 19 to the lower surface of the bottom plate 15 of the door body 11.

29 in FIG. 3 is a pier, and rollers 3 are provided on both sides of the door body 11 in vertical guide grooves 30 provided in this pier 29.
Insert 1. Moreover, watertight rubber 32 that closely contacts the pier 29 is provided on both sides of the door body 11.

In the embodiment of the above configuration, as shown in FIG.
6 is in close contact with the riverbed 12, when the water level on the upstream side rises and exceeds the bent edge 22, water flows into the inlet 21. The inflowing water flows down the water conduit 2o divided by the partition plate 19 while being rectified, and is discharged below the door body 11 through the discharge port 25 at the lower end. Therefore, all the water flows into the water conduit 2o from the inlet 21, so even if the water level rises further than the water level shown in Fig. 2 and becomes above the top of the door body 11, it will not exceed within a certain range. There is no flow. Therefore, compared to the gate as shown in FIG. 1, noise is significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a vertical side view showing a conventional overflow gate, FIG. 2 is a vertical side view showing an example of the gate of the present invention, and FIG.
The figure is a partially cutaway plan view of the same as above, and FIG. 4 is a partially cutaway perspective view of the same. 11... Door body, 19... Partition plate, 2o... Water conduit,
21... Inflow port, 25... Outlet port. Figure 1 262728

Claims (1)

[Claims] For overflow gates designed to allow water to overflow from the top of the gate body during minor floods, a water conduit with an inlet at the top and an outlet at the bottom is installed on the upstream side of the gate body for almost the entire length of the span. This conduit is divided by a number of longitudinal partitions,
The first exhaust is a noise prevention gate that opens downstream from the bottom of the door body.