JPS6187009A - Inverted radial gate - Google Patents

Abstract

PURPOSE:To prevent vibration of a gate, by a method wherein the end of a leg disposed to the outer side of an effluent pipe is coupled to a trunnion located up a flow from the outlet of the effluent pipe, a gate body part is attached to the forward end of the leg, and an opening and closing device is coupled to the upper pat of the gate body part. CONSTITUTION:A trunnion anchor part 4 is located to both sides up a flow from the outlet of an efluent pipe 1, and the anchor part 4 is secured to the efluent pipe 1 through efluent pipe stiffeners 3. A leg 6, rotatably coupled to the anchor part 4 through a trunnion 5, is located to the outside of the stiffeners 3, and a gate body part 7, formed with a skin plate 8 and beams 9, is attached to the forward end of the leg 6. A suspension part 13 is mounted to the upper part of the gate body part 7, and an opening and closing device 14, located to the upper part of a weir body, is coupled with the suspension part 13. When, with the opening and closing device 14 actuated, a gate is opened centering around the trunnion 5, the gate effects circular movement along a side roller 10 to open the outlet of the efluent pipe 1.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a reverse radial gate that is installed at the outlet of a discharge pipe and used as a flow rate control gate of a flood control discharge facility installed on a dam body. be.

[Conventional technology]

The radial gate located at the downstream end of the discharge pipe installed in the dam is usually attached to a part of the trunnion anchor (b) fixed at an appropriate position downstream from the outlet of the discharge pipe (α), as shown in Figure 3. , the end of the pedestal (c) is attached via a trunnion (d) so that it can rise and fall freely, and the door body has a skin plate (1) on the front surface having a curved surface with a radius R centered on the trunnion (d). (1) is attached to the tip of the pillar (c), and by rotating the door body part (1) around the trunnion (d) using an opening/closing device (not shown), the discharge pipe (α) is installed.
The outlet of the system is opened and closed to release or cut off water.

[Problem that the invention seeks to solve]

However, when there is a water level on the outlet side of the discharge pipe (α), that is, when there is a backwater level, if the conventional radial gate shown in Fig. 6 is used, when the gate is opened and discharge is started, the water will be submerged. As shown in the figure, the high-speed flow that flows out may wrap around the back side of the gate body portion and collide with the pillar (1), thereby inducing vibrations in the gate. In addition, if a roller gate is used instead of a radial gate, in which the door body moves up and down along the door groove, the diffusion angle becomes larger, so there are problems such as direct intrusion of the jet into the door groove and accumulation of earth and sand. Occur.

The present invention eliminates the possibility of the water flow colliding with the pillars even if a radial gate is used when there is a backwater level at the outlet of the discharge pipe, thereby eliminating the possibility of inducing vibration of the gate, and also eliminating the need for door grooves. The aim is to provide a gate that provides a

[Failure to solve the problem]

In the present invention, the legs of the radial gate are located upstream of the gate body, and the trunnion anchor is located upstream of the outlet of the discharge pipe and outside the discharge pipe. The ends of the legs are connected via a trunnion,
The front (inside) of the door body is used as a skin plate so that it can be opened and closed by an opening/closing device.

[For production]

When the opening/closing device rotates the gate around the trunnion and lifts it upward in an arc, the outlet of the discharge pipe is opened and the upstream water flows out in a high-speed stream. The legs pass through the outside of the discharge pipe and are pivotally attached to the trunnion on the upstream side of the discharge pipe, so even if the high-speed flow that has submerged and flowed out goes around to the rear of the gate body, it will not collide with the legs and will cause the gate to be photographed. There is no such thing.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show an embodiment of the present invention, in which a frame-shaped watertight rubber (
2), and a discharge pipe stiffener (5) is provided on the outside of the discharge pipe (1). Trunnion anchor parts (4) are positioned on both outer sides of the upstream side of the outlet of the discharge pipe (1), and the trunnion anchor parts (4) are connected to the discharge pipe through the discharge pipe stiffener (3). A leg (6) fixed to the trunnion anchor (4) and rotatably connected to the trunnion anchor (4) via the trunnion (5) is disposed on the outside of the discharge pipe stiffener (3), and the skin plate (8) and a girder (9) are integrally attached to the tip (downstream end) of the leg (6), and the skin plate (8) is centered around the trunnion (5). When the skin plate (8) is fully closed, the front surface (inner surface) of the skin plate (8) comes into close contact with the watertight rubber (2) at the outlet of the discharge pipe (2), making it possible to shut off water.

A side roller (QO) is attached to the side of the door body (7) to prevent it from swinging to the left and right when it rotates, so that it can be moved on the rail α2 laid on the embankment body αυ, and the upper part of the door body A mountain portion (13) is provided at the gate, and the opening/closing device (for example, a hydraulic cylinder) αa installed on the upper part of the embankment body is connected to the hanging portion α, so that the gate can be opened and closed by the opening/closing device (14).

Now, when the opening/closing device αa is activated and the gate is opened with the trunnion (5) as the center, the gate moves in an arc without swinging from side to side with the side rollers α0) on both sides, and the outlet of the discharge pipe (1) is opened. . The gate can be set to any desired opening position between the fully closed position shown by the solid line in FIG. 1 and the fully open position shown by the broken line in FIG. 1, and the flow rate can be adjusted. When the outlet of the discharge pipe (υ) is slightly open, the water in the discharge pipe (υ) becomes a high-speed flow and flows out, and due to the existence of a backwater level, the high-speed flow that flows out goes around the back of the door body. However, since the leg (6) is located on the upstream side of the door body and outside the discharge pipe, the water flow that has gone around will not collide with the leg (6).

Note that the reverse radial gate of the present invention is not limited to the above-mentioned embodiments. For example, a case is shown in which a part of the trunnion anchor (4) is joined to the discharge pipe (1), but this is not necessarily necessary. Instead, a trunnion anchor may be provided separately from the discharge pipe (1), and the load may be supported by an anchor girder, tension beam, PC material, etc. Also, the opening/closing device (14) may be a hydraulic cylinder. Alternatively, a hoist may be used.

〔Effect of the invention〕

As described above, according to the reverse radial gate of the present invention,
The trunnion is moved upstream from the discharge pipe outlet, the legs are placed outside the discharge pipe, and the ends are connected to the trunnion, so that the door body moves in an arc to open and close the discharge pipe outlet. , the following excellent effects can be achieved.

(1) Since the water flowing out from the outlet of the discharge pipe does not directly collide with the legs, there is no possibility of vibration of the gate.

(11) Conventional radial gates have legs on the downstream side of the outlet of the discharge pipe, which act as a pest control object, but in the present invention there are no obstacles, so even if driftwood, rocks, etc. there is no problem.

(iii) Since the legs serve as tension members, there is no need to increase the cross-sectional area in consideration of buckling.

(iv) Since there is no trunnion on the downstream side of the outlet of the discharge pipe, there is no need for civil engineering work for the trunnion sump, as in the conventional system.

(v) There is no need for door grooves.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of the reverse radial gate of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a side view of a conventional radial gate. (1) is the discharge pipe, (2) is watertight rubber, (4) is a part of the trunnion anchor, (5) is the trunnion, (6) is the leg, (7
) indicates the door body, ■ indicates the opening/closing device. Figure 1

Claims (1)

[Claims] 1) A trunnion is located outside the discharge pipe on the upstream side of the discharge pipe outlet, the ends of the legs arranged outside the discharge pipe are connected to the trunnion, and a door body is attached to the tips of the legs. A reverse radial gate characterized by an opening/closing device connected to the upper part of the door body.