JP3822715B2 - Backflow prevention gate for soot pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-powered gate installed for the purpose of preventing backflow at the outlet of a pipe or the like provided in a river.
[0002]
[Prior art]
Conventionally, a non-powered gate installed for the purpose of preventing a backflow at a soot tube outlet or the like is generally an upper hinge type flap gate, and is often employed.
[0003]
9 and 10 are a longitudinal sectional view and a front view showing the structure of a conventional non-powered backflow prevention gate. In the figure, reference numeral 21 denotes a door body installed at the outlet of the tub tube so that it can be opened and closed by a hanging metal fitting 22, and 23 is a door stop. In this gate, when the upstream water level> the downstream water level, the water is drained to such an extent that the door body 21 is slightly opened by the water pressure, so that the upstream dust is not completely removed and accumulates in the part a. When the side water level becomes high, the door body 21 is not completely closed due to dust or the like, and is flowing backward. Further, when the door body 21 is closed, there is a problem that lagoon soil accumulates in the portion b on the downstream side, and the door body 21 does not open even if the upstream water level becomes high.
[0004]
In this way, the advantage of the gate is that it does not require artificial operation (non-powered type), but because it is installed in a normally closed state (covering the cross section of the drainage pipe), The condition is not necessarily good, and it is easy to cause incomplete occlusion or inability to open and close by slight impurities.
[0005]
[Problems to be solved by the invention]
The present invention is intended to solve the following problems with respect to the conventional technique. 1. Improve normal drainage conditions (ensuring normally open).
When the upstream water level is higher than the downstream water level, the gate is opened in a Kannon manner to discharge the upstream water.
In addition, when the downstream water level is extremely low, a good drainage environment is created by making the fully open state.
[0006]
2. Minimize opening and closing problems caused by foreign objects.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the reverse flow prevention gate for dredging pipes of the present invention is provided with a gate composed of two upper and lower door bodies that can be opened and closed with a horizontal axis as a fulcrum at the upper and lower parts of the main river side outlet of the dredging pipe. An upper torque arm is fixed to the upper door body so as to be rotatable around an upper horizontal axis, and a lower torque arm is fixed to the lower door body so as to be rotatable around a lower horizontal axis. The upper torque arm and the lower torque arm are connected by an interlocking arm so that when the lower door body is opened to the main river side, the upper door body is also opened to the main river side.
[0008]
In this gate, the counter weight is fixed to the upper door body so as to be rotatable around the upper horizontal axis, and the balance weight is fixed to the lower door body so as to be rotatable around the lower horizontal axis. It can be.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described with reference to examples.
FIG. 1 is a side view showing the embodiment of the present invention when the door is closed, FIG. 2 is a front view thereof, and FIGS. 3 and 4 are side and side portions of the door bodies 3 and 4 in the daytime portion. It is an enlarged view. In these drawings, 1 is an upper hinge, 2 is a lower hinge, 3 is an upper door body, 4 is a lower door body, 5 is a door support, 6 is an upper arm, 7 is a lower arm, and 8 is an upper weight (counter weight). , 9 is a lower weight (balance weight), 10 is a connecting arm, 11 is an upper door, 12 is a lower door, 13 is an upper watertight rubber, 14 is a lower watertight rubber, 15 is an intermediate watertight rubber, and 16 is a side watertight. A plate, 17 is a side watertight rubber, 18 is an upper and lower shaft, 19 is a watertight frame, and 20 is a rotating side watertight rubber.
[0010]
In this embodiment, the upper and lower door bodies 3 and 4 are fixed to the side arms 7 and 8, and the two door bodies 3 and 4 are connected by connecting the arms 7 and 8 with the connecting arm 10 and rotating them. Is a mechanism that can be opened and closed at a fixed angle to each other in a kannon style.
[0011]
In the gate of the above mechanism, the weights 8 and 9 are respectively attached to the upper and lower arms 7 and 8 at a fixed angle, and the upper and lower door bodies 3 are adjusted according to the weight of the door bodies 3 and 4. , 4 is adjusted.
[0012]
FIG. 5 is a side view when the door body is closed, and FIG. 6 is a side view when the door body is fully opened.
[0013]
By providing such an adjustment mechanism, the rotational force of the upper and lower door bodies 3 and 4 is appropriately adjusted, and the gate can be opened and closed automatically and without power according to the fluctuation of the water level on the upstream and downstream sides of the pipe. To do.
[0014]
Normally, the upper and lower gates are both open and opened and closed by a slight water level difference between the main river and the tributaries. Prevent backflow to the side.
[0015]
FIG. 7 shows the operating state of the gate when the water level on the main river side decreases. When the water level on the main river side decreases, water pressure is applied to the lower door body 4, and the lower door body 4 tilts toward the main river side. When the lower door body 4 is inclined, the upper door body 3 is also opened by the connecting arm 10. When the water level on the main river side decreases, the door bodies 3 and 4 are finally fully opened as shown in FIG.
[0016]
FIG. 8 shows the operating state of the gate when the water level on the river side rises. When the water level on the main river side slightly rises as shown in FIG. 8B, buoyancy acts on the lower door body 4 and the lower door body 4 rises from the fully open state to the closing direction. In conjunction with this, the upper door 3 is also lowered by the action of the connecting arm 10. When the main river side water level further rises, the lower door body 4 rises along with it, and the upper door body 3 also descends to close the gate. When a water level difference of a certain level or more occurs, the fully closed state is obtained as shown in FIG.
[0017]
【The invention's effect】
As described above, according to the present invention, the upper and lower door bodies are both open at all times, and are opened / closed by a slight difference in water level between the main river and the tributaries, and when the water flows out (when the water level on the main river side rises) Is in a fully closed state, and it is possible to reliably prevent backflow to the tributary (mineral pipe) side.
[0018]
1) When the main river side water level is low at all times, ensure a good drainage function by opening it.
Even if there is a slight difference in water level, the lower / floating type overturning gate can be drained in an overflow state, so that no dust remains in the soot pipe.
[0019]
2) By properly securing the weight balance between the upper and lower gates, the valve can be closed reliably with a slight difference in water level, and at the same time, when the main river side water level exceeds the inner water level, the fully closed state is always secured. be able to.
[0020]
3) Even when foreign matter or the like remains on the hinge portion or the like of the lower gate, it can be easily removed by natural drainage or the like, and a gate shape / structure that does not hinder the opening / closing operation can be obtained.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an embodiment of the present invention.
FIG. 2 is a front view of an embodiment of the present invention.
FIG. 3 is an enlarged view of a side watertight portion of the door body middle portion.
FIG. 4 is an enlarged view of an upper and lower side watertight part of the middle part of the door body.
FIG. 5 is a side view when the door body is closed in the embodiment.
FIG. 6 is a side view when the door body is fully opened in the present embodiment.
FIG. 7 is a flowchart showing an operation when the water level on the river side decreases in the embodiment.
FIG. 8 is a flowchart showing an operation when the water level on the main river side rises in the present embodiment.
FIG. 9 is a side view showing the structure of a conventional gate.
FIG. 10 is a front view showing a structure of a conventional gate.
[Explanation of symbols]
1 upper hinge, 2 lower hinge, 3 upper door body, 4 lower door body, 5 door support, 6 upper arm, 7 lower arm, 8 upper weight (counter weight), 9 lower weight (balance weight), 10 connecting arm, 11 Upper door contact, 12 Lower door contact, 13 Upper watertight rubber, 14 Lower watertight rubber, 15 Intermediate watertight rubber, 16 Side watertight plate, 17 Side watertight rubber, 18 Top and bottom shaft, 19 Watertight frame, 20 Rotating side Watertight rubber

Claims (2)

A gate consisting of two upper and lower doors that can be opened and closed with the horizontal axis as a fulcrum is provided at the upper and lower parts of the main river side outlet of the culvert pipe, and the upper door rotates around the upper horizontal axis. The upper torque arm is freely fixed, the lower torque arm is fixed to the lower door body so as to be rotatable around the lower horizontal axis, and the lower torque body is connected to the upper torque arm and the lower torque arm. A reverse flow prevention gate for a soot pipe characterized by being connected by an interlocking arm so that the upper door body is also opened to the main river side when opened to the main river side. A counterweight is fixed to the upper door body so as to be rotatable around the upper horizontal axis, and a balance weight is fixed to the lower door body so as to be rotatable around the lower horizontal axis. The reverse flow prevention gate for a soot tube according to claim 1.

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