JP2518837B2 - Discharge facility for circular pipe - Google Patents

Description

TECHNICAL FIELD The present invention relates to a discharge facility for a circular pipe.

[Prior Art] Conventionally, in water discharge facilities, emergency discharge facilities, small flood discharge facilities, etc., when the flow velocity at the time of full opening is high (10 m / s or more), certainty of the flow cutoff, Stability,
In consideration of measures against cavitation, generally, as shown in FIG. 5, a rectangular opening type high pressure slide gate (ordinary high pressure slide gate, narrow slot type high pressure slide gate) is adopted as the sub-gate a, or Sixth
As shown in the figure, a ring follower gate is adopted as the sub-gate a '. In both types, a jet flow gate (or a hollow jet valve or a fixed cone valve as a main valve) is used as the main gate b. In FIGS. 5 and 6, c is an air valve, d is an air pipe, and e is a drive device.

[Problems to be Solved by the Invention] However, in the system shown in FIG. 5, since the door f of the sub-gate a and the bonnet g are congonal, if the discharge pipe h is circular, the sub-gate a An expensive transition i in which the cross section of the pipe changes from a circular shape to a rectangular shape is required between the discharge pipe h and the discharge pipe h, which is not economical. Further, since the transition i is provided, the distance between the main gate b and the sub gate a becomes long, which leads to the enlargement of the gate chamber j, which has been mentioned as one of the disadvantageous conditions in terms of the civil engineering structure.

On the other hand, in the system shown in FIG. 6, the bonnet g of the sub-gate a'which requires precise machining becomes large in size, which makes it extremely expensive. In addition, it lacks maintainability and has problems such as sedimentation and sedimentation in the lower bonnet part g ′ that protrudes largely downward from the discharge pipe h, and this condenses, which impairs the water flow blocking function and the water stopping function. There was a risk.

Further, the jet flow gate used as the main gate b of both types shown in FIG. 5 and FIG. 6 has an excellent function as a flow rate control device, but on the other hand, it is a full-open type that affects the equipment scale. There was a problem in this point because the hourly flow coefficient was about 0.8.

The present invention has been made to solve these problems.

[Means for Solving the Problems] In the present invention, the door body has a short shape, and the downstream edge of the door groove for receiving the door body is made wider than the upstream edge so that the opening shape when fully opened is circular. Skin plate type high pressure slide gate,
It is installed as a main gate at the end of the circular discharge pipe, and the bottom door contact surface has a three-sided structure that circumscribes the bottom inner surface of the discharge pipe, and the door body has a structure corresponding to the bottom door contact surface. A rear skin plate type high-pressure slide gate whose opening shape is circular is installed as a sub-gate in the middle of the discharge pipe located upstream of the main gate, and further downstream of the main gate from the discharge pipe. The downstream pipe having a wide cross-sectional area is connected to the downstream edge of the door groove.

[Operation] When the sub-gate is opened, the sediment, dust, etc. contained in the running water flows with the running water without accumulating on the bottom door contact surface. or,
When the main gate is opened, running water is discharged without exerting water pressure on the bonnet.

[Examples] Examples of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, the present invention comprises a main gate 1, a sub-gate 2, a downstream pipe line 3 and the like, and is applied to a circular discharge pipe 4.

The main gate 1 is a front skin plate type high-pressure slide gate in which the opening shape of the passage 5 when fully opened is circular, and a watertight rubber 8 is provided on the upstream door contact surface of the bonnet 6 (the end side of the discharge pipe 4). Is attached in a circumferential frame shape, and the door body 7 which slides on the watertight rubber 8 has a short shape.
The slip of the door body 7 is slightly bent downstream so as to avoid damage to the watertight rubber 8. Further, the shape of the door groove 9 is such that the downstream edge is wider than the upstream edge so that the main vein at the time of partial opening does not collide with the downstream edge of the door groove 9 (shown by θ ₁ in FIG. 2). Incidentally, 10 is a hydraulic cylinder as a drive device for raising and lowering the door body 7.

The sub-gate 2 is a rear skin plate type high pressure slide gate in which the opening shape of the passage 11 at the time of fully opening is circular, and the bottom door contact 13 at the bottom of the bonnet 12 has the shape of the lower inner surface of the circular discharge pipe 4. It is composed of three circumscribing bent plates, for example, in the range of 30 ° (shown by θ ₂ in FIG. 4) 15 ° to the left and right from the center of the passage 11 or the discharge pipe 4 with respect to the vertical axis of the door 14. Is a horizontal plane portion 13a, and the range from both ends of the horizontal plane portion 13a to the bonnet 12 side portion is inclined plane portions 13a and 13b inclined upward by 30 ° (shown by θ ₃ in FIG. 4). On the other hand, the door body 14 has a bottom shape corresponding to the bottom door stop 13, a gate-shaped watertight plate 15 is attached to the downstream surface from the upper part to the side part, and the lower end (or bottom part) of the door body 14 is further installed. A bottom watertight rubber 16 is attached to the door stop 13). A sub-watertight rubber 17 having a structure that slides on the downstream surface of the bonnet 12 is attached to a position above the watertight plate 15 of the door body 14. In addition, 20 is a side door contact formed on the side of the bonnet 12,
Reference numeral 18 is a hydraulic cylinder as a drive device for moving the door 14 up and down.

The downstream pipe line 3 is connected to the downstream edge of the door groove 9 in the main gate 1 and has a stepped portion 19 formed to have a wider cross-sectional area than the passage 5, that is, the discharge pipe 4, and has a square shape or a semi-cylindrical shape.

In the figure, reference numeral 21 is an air valve provided so as to communicate with the portion immediately downstream of the sub-gate 2, and reference numeral 22 is an air pipe provided immediately downstream of the main gate 1.

In the discharge facility for a circular pipe of the present invention, since the passage 11 of the sub-gate 2 is circular as described above, it can be used by attaching it to the middle portion of the discharge pipe 4 which is a circular pipe without using a transition. it can.

In the sub-gate 2, when the door 14 is lowered to the lowermost position by the operation of the drive device 18, the watertight plate 15 comes to the side door contact 20 and the bonnet downstream surface, and the bottom watertight rubber 16 comes to the bottom door contact 13. The passages 11 are blocked by closely contacting each other.

On the other hand, when the door body 14 is lifted to open the passage 11, flowing water from the upstream discharge pipe 4 side flows downstream through the passage 11. At this time, the bottom door contact 13 has a bent shape tangentially along the inner surface shape of the discharge pipe 4, and the bottom door contact 13 surface and the passage 11
Since there is no groove formed between the bottom and the bottom, the sand and dust contained in the running water will flow with the running water and hit the bottom door.
It does not accumulate on the 13th surface.

Therefore, as described above, when the door body 14 is lowered to the lowest position, no sand or the like is interposed between the bottom watertight rubber 16 and the bottom door contact surface 13, and a completely closed state can be obtained.

In addition, the main gate 1 is designed so that the downstream edge of the door groove 9 is wider than the upstream edge so that water pressure does not act on the bonnet, and the downstream pipe line 3 is also discharged so as to be continuous with the downstream edge of the door groove 9. Since the step is formed with a cross-sectional area wider than that of the pipe 4, the flow coefficient when fully opened is 1.0. This makes it possible to control the flow rate in a stable manner and prevent abnormal noise and damage due to cavitation. Furthermore, since the downstream pipeline 3 is wide, maintenance of the watertight rubber 8 and the like of the main gate 1 is easy.

The present invention is not limited to the above-described embodiment, and the main and sub gate doors may be driven by a spindle system, and various modifications can be made without departing from the scope of the invention. .

[Effects of the Invention] As described above, according to the discharge facility for a circular pipe of the present invention, (i) the sub-gate can be installed without using a transition, so that the interval between the main and sub-gates can be shortened.

(Ii) The main gate has a flow coefficient of 1.0 when it is fully opened, and stable controlled discharge is possible, so no abnormal noise or damage due to cavitation occurs.

(Iii) The sub-gate can ensure stability and safety when the flow is fully open, and can reliably shut off running water.

(Iv) Excellent in water stopping function.

(V) Maintenance is easy.

(Vi) It is highly economical.

And so on.

[Brief description of drawings]

FIG. 1 is a schematic side view of a discharge facility for a circular pipe according to the present invention.
1 is a plan view in section of FIG. 1, FIG. 3 is an explanatory view of a main gate, the right half is a view taken along the line AA of FIG. FIG. 4 is an explanatory view of the sub-gate, and the right half is a view taken along the line CC of FIG. 1, the left half is a view taken along the line D-D of FIG. 1, and FIGS. FIG. 1 is a main gate, 2 is a sub-gate, 3 is a downstream pipe, 4 is a discharge pipe, 5 is a passage, 7 is a door, 9 is a door groove, 11 is a passage, 12 is a bonnet, 13 is a bottom door contact, 14 Indicates a door, and 19 indicates a step.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuzo Mitani 12 Nishiki-cho, Naka-ku, Yokohama City Yokohama Works, Ltd. (72) Toshiharu Nakata 1-6-14 Edobori, Nishi-ku, Osaka City Hitachi Shipbuilding Co., Ltd. (72) Inventor Katsumi Izuhara 118 Futatsuka, Noda City, Kawasaki Heavy Industries Ltd. Noda Factory (72) Inventor Yukihiko Ueda 1-19-10 Mori, Koto-ku, Tokyo Ishikawa Shima Harima Heavy Industries, Ltd. Koto Office (56) Reference References: 60-85322 (JP, U) 58-54432 (JP, U)

Claims (1)

(57) [Claims] 1. A front skin plate type high pressure slide gate in which a door body is short, a downstream edge of a door groove for receiving the door body is wider than an upstream edge, and an opening shape when fully opened is circular. It is installed as a main gate at the end of the circular discharge pipe, and the bottom door contact surface has a three-sided structure that circumscribes the bottom inner surface of the discharge pipe, and the door body has a structure corresponding to the bottom door contact surface. A rear skin plate type high-pressure slide gate whose opening shape is circular is installed as a sub-gate in the middle of the discharge pipe located upstream of the main gate, and further downstream of the main gate from the discharge pipe. A discharge facility for a circular pipeline, wherein a downstream pipeline having a wide cross-sectional area is connected to a downstream edge of the door groove.