JPS60141914A - Roller gate for adjusting stream flow - Google Patents

Abstract

PURPOSE:To prevent a locking phenomenon of a roller gate by a method that short rectifying walls are set up at the lower ends of both sides of the gate to close gate guide groove; locking prevention rollers are fitted; the bottom of a discharge pipe is made low; and a water-tight rubber is set up. CONSTITUTION:A gate 1, upstream discharge pipe 2, downstream discharge pipe 3 and guide groove 4 are set up. Both sides of the gate 1 are opened and closed by being guided in the vertical direction by the guide groove 4. Short baffle walls 5, which are set up at the lower ends of both sides of the gate 1, close guide groove 4 near the lower ends of the gate 1. Locking prevention rollers 7 fitted into the guide groove 4 are fixed to the walls 5 to prevent the gate 1 from producing a locking phenomenon at the time of full-open discharge. By this method, cavitation and vibration caused by high-speed diffusion stream are prevented, and the opening and closing of the gate can be easily carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a roller gate for controlling flow rate of flood control discharge equipment installed in a dam.

[Prior art]

Among gates for flood control discharge pipes installed in dams, those conventionally used as roller gates with skin plates placed on the upstream side include (1) as shown in Figures 1 and 2; General type roller gate with normal door grooves.

(11) As shown in Fig. 4, a span-enlarged roller gate in which the width between the downstream edges of the door groove is increased.

(iii) As shown in Figures 5 to 7, a roller gate with legs that completely blocks the door groove even when the gate is fully opened.

(1v) As shown in Figures 8 and 9, the door groove width reduced type roller gate has the skin plate placed as far upstream as possible from the door groove upstream surface and the door groove upstream edge extended to the vicinity of the roller shaft. .

It is roughly divided into four types.

Among these, the (+) and - pattern roller gates are shown in Figures 1 and 2.
Assuming that the water flow (α) flows from left to right as shown in the figure, the upstream discharge pipe (c) and downstream discharge pipe (d) in Game 1-(b) are both the same. Because the width is (1), the high-speed diffused water flow (g) ejected from both corners of the lower end of the gate (force) collides with the downstream surface (h) of the gate when the water is partially opened. As in, the downstream edge of the doorway (<)
The pressure in the vicinity is significantly lower than atmospheric pressure due to streamline separation, and the area near the downstream edge 1) of the trench is often damaged by cavitation. In addition, as the high-speed diffused water flow (g) collides with the downstream surface (h) of the P groove, intense turbulence with rotation is generated in the gate groove 1j), which causes the gate (b
) may vibrate violently, so it cannot generally be used as a flow control gate.

As shown in Fig. 4, the span-expanding roller gate (11) has a high-speed diffused water flow (g) ejected from the gate (bottom corners V of the gate) that collides with the downstream edge of the door groove <i+. It is a trench that extends approximately 40 degrees from side to side. Therefore, cavitation of the gate (jl) and vibration of the gate (b) caused by the high-speed diffused water flow (g) can be prevented, but the roller (&
), f&) increases, the weight of the gate NI+1 increases, resulting in a very uneconomical design compared to the general type roller gate (1).

(As shown in Figures 5 to 7, the roller gate with 11 legs closes the door groove (j) with the legs (1) provided on both sides of the gate (b) at any opening degree. Therefore, since it is effectively the same as if there were no door groove (j), no diffused water flow would occur from the lower end of the gate (b), but the height of the discharge pipe on both sides of the gate (b) It is necessary to provide two legs (1) for the same length of time, and to provide pits (m) for storing the legs (1) on both sides of the water discharge pipe.For this reason, compared to the general type roller gate in (i), it is less expensive. Not only is this an economical design, but there is a risk that sediment and sludge will form on the bit () → and this will solidify, causing a serious problem in which the gate cannot be fully opened.Also, there is a possibility that the gate (b) side is equipped with watertight rubber. The disadvantage is that it is difficult to achieve complete watertightness, which is one of the most important functions of a gate.

(iv) The door groove width reduction type roller gate is shown in Figs. 8 and 9.
As shown in the figure, the round edge of the upstream discharge pipe (C) side of the door groove (j) is extended to the vicinity of the roller axis (?Z) of the gate (j) to reduce the door groove width (o), and The bottom of the discharge pipe (d) is lowered, the sides are widened, and watertight rubber is attached to the gate (b) side to make it watertight.

Therefore, the skin plate of gate (b) is placed far upstream from the upstream line of door groove (j), and although there is little water flow from the lower end of the gate, the skin plate of door groove (j Therefore, if driftwood or other objects get into the door groove (j), it will be difficult for them to flow down naturally, and this may cause serious problems such as interfering with the opening and closing operations of the gate.Also, watertight rubber should be installed on the gate (b) side. Since the rubber is attached to the door stop or gate (to absorb manufacturing and installation errors), it is difficult to adjust the rubber attachment, making it difficult to achieve complete watertightness. In order to prevent water from spraying from the gate, it is necessary to install a sub-watertight rubber on the upper door stop, making it more complicated.Also, when the water pressure center coincides with the bottom roller axis (n) and the opening is large, the gate ( b) There is a drawback that a rocking phenomenon occurs in which rotational vibration occurs around the center of the lowermost roller shaft (,) due to slight pressure fluctuations in the surrounding area.

[Purpose of the invention]

The present invention improves the above-mentioned conventional drawbacks, rectifies the high-speed diffused water flow jetting out from both corners of the lower end of the gate during partial opening discharge, and prevents severe turbulence from occurring in the door groove. The purpose of this is to prevent the occurrence of cavitation on the downstream surface of the doorway due to gate vibration and jet diffusion, and to prevent the locking phenomenon of the gate due to pressure fluctuations in the discharge pipe during wide-open discharge.

[Structure of the invention]

In order to achieve the above object, the present invention provides door grooves vertically on both sides of a discharge pipe, and a short rectifier with a length that closes the door grooves at the lower end of both sides of a gate that goes up and down guided by the door groove to open and close the discharge pipe. A wall is installed, and an anti-locking roller that fits into the door groove is attached to this rectifying wall.The bottom of the discharge pipe is lowered downstream of the gate, and the sides are slightly widened. This is a roller gate for flow rate adjustment with endless watertight rubber that touches the sides.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIGS. 10 to 13, (1) is a gate, (
2) is an upstream discharge pipe, (3) is a downstream discharge pipe, and (4) is a doorway, where the upstream water discharge pipe (2) and the downstream water discharge pipe (3) are
), and both sides of the gate (1) are guided vertically by grooves (4) to open and close. As is clear in Figure 13, the gate (1
) are provided with short rectifying walls (5) at the lower ends of both sides to close the door groove (4) near the lower end of the gate (1). The reason why the rectifying walls (5) are provided at the lower ends of both sides of the gate (1) is to prevent high-speed diffusion that is ejected from both lower corners of the gate (1) when the gate (1) is partially opened and discharges water, as shown in Figure 14. Focusing on the fact that the water flow (6) only occurs near the water surface, in order to rectify the high-speed diffusion water flow (6), only the door groove (4) near the lower end of the gate (1) is closed. .

And the anti-locking roller (
7) (see Figures 10 and 12) is attached to the rectifying wall (5) to prevent the gate (1) from causing a locking phenomenon when the gate (1) is wide open and discharges water.

The shape of the rectifying wall (5) when viewed from the front is shown in Figure 13.
The rectangular one shown in Fig. 15, the one connected to the lower end of the gate (1) through the short hypotenuse (8) as shown in Fig. 16, and the one connected to the lower end of the gate (1) with the long hypotenuse (9) as shown in Fig. 17.
), which connects to the lower end of the arc Q as shown in Figure 18.
A conceivable example is one connected to the lower end of the gate (1) at Q.

To prevent the door groove (4) from becoming bag-like, the bottom αυ of the downstream discharge pipe (3) is lower than the upstream side, as shown in Figure 10, and the side part is lower than the upstream side, as shown in Figure 11. As shown in FIG. 12, it is slightly wider than the upstream side.

Furthermore, the gate lip (A) of the gate (1) is made into a sharp edge to prevent vibrations due to re-deposition of flowing water, and is attached to the end of the upstream discharge pipe (2) so as to be in contact with the upstream surface of the gate (1). The watertight rubber α-Higashi is designed as a frame-like endless frame with four continuous circumferences on the doorstop side, in order to simplify the watertight structure and achieve complete watertightness.

〔Effect of the invention〕

The present invention has the following effects.

(1) Short rectifying walls that close the door grooves near the lower end of the gate are provided at the lower ends of both sides of the gate, so cavitation and vibrations due to high-speed diffused water flow do not occur.

(11) Since the anti-locking roller is attached to the rectifying wall and fitted into the door groove, the locking phenomenon does not occur.

(iii) The bottom of the downstream discharge pipe is low and the sides are slightly widened so that the door groove does not become bag-shaped, so even if garbage gets into the door groove, it will flow out immediately and the gate can be opened and closed. There is no risk of causing any problems.

(1v) Water rubber is attached to the discharge pipe in an endless form that touches the upstream side of the gate, so not only can it be expected to be completely watertight, but the gate lip can also be made with a sharp edge to prevent vibrations caused by the reattachment of flowing water. It can be prevented.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional side view of a conventional general type roller gate;
The figure is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is an explanatory diagram showing the flowing water and its pressure near the door groove in Figure 2, Figure 4 is a plan view of a conventional wide-span type roller gate, Figure 5 is a vertical side view of a conventional roller gate with legs, Figure 6 is a front view of Figure 5, Figure 7 is a sectional view taken along the line ■-■ in Figure 6, and Figure 8 is a conventional narrow door groove type. FIG. 9 is a plan view of FIG. 8; FIG. 10 is a longitudinal side view of an embodiment of the present invention; FIG.
The figure is an enlarged front view of the rectifying wall on the line X-15 of FIG. 10. FIGS. (1) is the gate, (2) is the upstream discharge pipe, (3) is the downstream discharge pipe, (4) is the door groove, (5) is the rectifying wall, (7n is the anti-locking roller, 0υ is the bottom , 03 indicates watertight rubber.Continued from page 1 [Phase] Inventor: Hitoshi Sekino Tsukudasha Tsukuda Office, Chuo-ku, Tokyo [Phase] Inventor: Koji Fujiwara Inside the Hikarimachi 5-chome Factory, Kure City

Claims (1)

[Claims] 1) Door grooves are provided vertically on both sides of the discharge pipe, and short rectifying walls are provided at the lower ends of both sides of the gate, which is guided by the door grooves to go up and down to open and close the discharge pipe, and are long enough to close the door grooves. An anti-locking roller that fits into the door groove is installed on the rectifying wall,
The bottom of the discharge pipe is lowered on the downstream side of the gate, and the side portions are slightly widened, and the discharge pipe is provided with an endless watertight rubber that is in contact with the upstream surface of the gate. Roller gate for flow rate adjustment.