JPS6027149Y2 - Tipping gate device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tipping type gate device installed between piers or dams of rivers, waterways, etc.

Conventionally, in this type of gate device, the lower part of the gate body is rotatably supported on the floor level difference between the dams or piers of waterways, rivers, etc. An operating arm is fixed to the rotating shaft, and a rod end of a hydraulic cylinder installed in the machine room is pivotally attached to the end of the operating arm, and a spoiler is attached to the upper edge of the door body. It is generally known that the

In other words, in an overturning gate, cavitation occurs because negative pressure is generated or interrupted by water overflow on the downstream side of the gate body, so in order to prevent this, the upper end of the gate body is Attempts have been made to provide spoilers on the edges to eliminate the generation of negative pressure.

However, even with this spoiler, the generation of negative pressure cannot be completely eliminated, and therefore cavitation cannot be prevented.

This invention was made in view of the above-mentioned circumstances with the purpose of preventing negative pressure from being generated on the downstream side of the door body and preventing cavitation.

That is, in this invention, an overturning gate is arranged so as to be able to move up and down on a level difference in the floor of a waterway, river, etc., and the overturning gate rotation axis is exposed in a machine room installed in a dam or pier. The base end of an operating arm is fixed to this rotating shaft, and the rod end of a hydraulic cylinder installed in the machine room is pivotally attached to the tip of this operating arm, and an air supply pipe is provided below the step. The pipe is buried so that the downstream side is exposed, and a plurality of air circulation ports are provided in the exposed part of the pipe, and the air supply pipe is communicated with a vent-type hole provided in a dam or pier whose upper end is open to the atmosphere through a communication path. It is characterized by

According to this invention, the downstream space of the overturning gate is communicated with the atmosphere through the air supply pipe and the vertical hole even when water is flowing over the upper edge of the overturning gate, so negative pressure can be maintained. It never becomes.

Therefore, there is no need to provide a spoiler or the like, and the generation of negative pressure in the downstream space of the overturning gate can be completely prevented, cavitation can be completely prevented, and vibration of the overturning gate can also be prevented.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the structure of an embodiment of this invention will be described in detail with reference to the drawings.

In the drawing, 1 is the waterway, 2 is the pier, 3 is the waterway bed,
A stepped portion 3A is provided in the waterway floor 3, and the downstream floor 3B is lower than the upstream side, and the overturning gate 4 is mounted on the stepped portion 3A via a bearing 5 and rotation shafts 6, 7 so as to be able to rotate and raise and lower. supported.

One rotation shaft 6 faces into a machine room 8 provided in the pier 2, and the base end of a gate undulation operation arm 9 is wedged to the end of this rotation shaft.

In the machine room 8, there is a hydraulic cylinder 1 for raising and lowering the gate.
The base end of the hydraulic cylinder 10 is swingably attached to a bearing stand 12 via a horizontal shaft 11, and the piston rod 1 of this hydraulic cylinder 10
The third end is pivotally connected to the free end of the operating arm 9 via a horizontal shaft 14.

15 is a bottom water stop rubber, 16 is a side water stop rubber, 17 is a side water stop plate, 18 is a cover of a letter manhole provided at the top of the machine room 8, and 19 is a gate pedestal.

An air supply pipe 20 having a hollow rectangular cross section is buried below the stepped portion 3A in parallel with the rotation axis 6 of the overturning gate 4 so that the downstream side surface 20A is exposed. A plurality of air circulation ports 21 are opened.

The pier 2 is provided with a ventilation hole 22 whose upper end is open to the atmosphere on the upstream side of the machine room 8.
The lower end of 2 is connected to the air supply pipe 20 via a ventilation pipe 23.

According to the embodiment of this invention, when ice is discharged from the upper edge of the overturning gate 4, the air on the downstream side of the overturning gate 4, that is, the back space is entrained by the flowing water, and this back space is connected to the air supply pipe. 20, it is communicated with the atmosphere through the ventilation pipe 23 and the ventilation hole 22, so that atmospheric pressure is maintained.

Therefore, the back space of the overturning gate 4 does not become a negative pressure, there is no possibility of cavitation occurring, and stable discharge can be performed without the gate vibrating.

Furthermore, by introducing water from the upper end opening of the ventilation hole 22 using a pump or the like, the earth and sand accumulated on the downstream floor 3B of the overturning gate 4 can be washed away downstream.

In addition, in order to enhance the sand removal effect, the shape and number of the air flow ports 21 may be appropriately selected.

Furthermore, the air supply pipe 20 may have a circular cross section, and the vent hole 22 and the vent pipe 23 may also have a circular cross section.

In the overturning gate device according to this invention, as described above, the space behind the gate and the atmosphere above the top of the pier are communicated via the air supply pipe 20, the ventilation hole 22, and the ventilation pipe 23, so the gate Even when the back space is covered with overflow water, negative pressure does not occur, so cavitation does not occur, scour caused by erosion does not occur, and the vibration of the overturning gate is prevented. This has the effect of allowing stable overflow to continue.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, and FIG. 1 is a perspective view with the right bank side pier removed, and FIG. 2 is a longitudinal sectional view of the main part. 1 is the waterway, 2 is the pier, 3 is the waterway floor, 3A is the step, 4
is an overturning gate, 5 is a bearing, 6 and 7 are rotating shafts, 8 is a machine room, 9 is an operating arm, 10 is a hydraulic cylinder, 13 is a piston rod, 20 is an air supply pipe, 2OA is a downstream exposed surface, 21 22 is a vent hole, and 23 is a vent pipe.

Claims (1)

[Scope of utility model registration request] The overturning gate is installed on a level difference in the floor of a waterway, river, etc. so that it can be rotated up and down. An operating arm is fixed to the operating arm, and a rod end of a hydraulic cylinder installed in the machine room is pivotally connected to the end of the operating arm, and an air supply pipe is buried below the step so that the downstream side is exposed. In addition, a plurality of air circulation ports are provided in the exposed portion, and the air supply pipe is connected to a vent hole provided at the dam or pier, the upper end of which is open to the atmosphere.