JPH0439530B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention automatically controls the upstream or downstream backflow of waterways installed on rivers or coasts during abnormal water rises or high tides, thereby preventing flood damage. This invention relates to an automatic backflow prevention device for waterways.

(Conventional technology) Conventionally, this type of automatic backflow prevention device uses an automatic water level adjustment gate to fulfill its role, but since the mainstream is an electric type with a water level detection sensor, it requires large-scale equipment. This requires high construction costs, and has the disadvantage that its functionality may be affected in the event of a power outage due to lightning or other causes.

(Problems to be Solved by the Invention) Conventional electric devices equipped with water level detection sensors that require power require considerable installation costs, and do not function as automatic backflow prevention devices in the event of a power outage due to lightning strikes, etc. equipment costs are high, power is required, and the equipment is affected by power outages. can be mentioned.

(Means for solving the problem) A doorstop is installed in the waterway, and a support arm is provided that is connected to the gate via a bracket and a connecting rod that moves up and down within the doorstop to an arbitrary height. The arm uses a bearing pin as a fulcrum, and is equipped with a gate on one side and a slidable balance weight and float on the other. Under normal conditions, the moment on the balance weight side is increased so that the balance weight is horizontal as shown in Figure 1. In addition to creating a balanced state that can be maintained, a slidable arm member with a float suspended from the support arm is provided, and the float is positioned at the planned water level in a pit communicating with the waterway, in which case it is not affected by buoyancy ( This is an automatic backflow prevention device for waterways formed during normal times.

(Structure of the Invention) One embodiment of the present invention will be described with reference to the drawings.
is the gate, 2,2 is the door stop, 3,3 is the connecting rod 4,
4, 5, 5 are pins of the brackets 3, 3, 6, 6 are support arms that open and close the gate 1 using the bearing pins 7, 7 as fulcrums, 8, 8 are bearings that support the bearing pins 7, 7. Bracket, 9,
9 is a stopper for the support arms 6, 6 that keeps the gate 1 raised at a constant height; 10 and 11 are the beams of the support arms 6, 6; and 12, 12 are connected to the mounting member 13 that holds the balance weight 14. The slideable mounting rods 15, 15 are fixed bolts thereof, and the slider mounting rod 16 is integrally constructed with an arm member 18 from which a float 17 is suspended.

19 is a fixing bolt for the mounting rod 16; 20 is a mounting bracket for fixing the float 17 via a connecting rod 21;
22 is the lock bolt, 23 is the pin that connects the float 17 and the connecting rod 21, 24 is the bracket, 25, 25 are the connecting rods 4, 4 and the support arm 6,
6, the pins 26, 26 are the support arms 6,
This is the reinforcing material of No.6. 27 is a pit communicating with the waterway, 28 and 28 are water inlets provided in the pit 27, 29 and 29 are slabs of the dam, 30 is the bottom of the waterway, H is the upstream side of the gate, and L is the downstream side thereof. , J indicates the flow in the reverse direction at the time of abnormal water rise, A indicates the normal water level, and at that time, gate 1
is at the top position of E (dashed line).

(Operation of the invention) As shown in Figure 1, the doorstop 2 installed on the wall of the waterway,
A rotatable connecting rod 4 is attached to one end of the support arm 6, which serves as a fulcrum 7, 7, and the gate 1 is inserted into and held by the support arm 2.
4 are connected to brackets 3, 3 provided on the gate 1 via pins 25, 25 and pins 5, 5, and the moment is normally applied from the gate 1 side to the other end of the support arms 6, 6 facing the gate 1. A slideable balance weight 14 and a float 17 are attached to increase the size.

The gate 1 is lifted up by the balancing action of the support arms 6, 6, and when it rises and reaches the maximum lifting position, it is stopped by the stoppers 9, 9 of the support arms 6, 6.

Therefore, the rising height of the gate 1 is maintained at the planned height E, and the balance weight 14 serves as a weight at the position E'.

On the other hand, a connecting rod 21 is connected to the pit 27 that communicates with the waterway.
A float is connected to the support arms 6, 6 via a mounting rod 16, and is normally held at a position where no buoyancy acts on the float, that is, slightly above the planned water level.

When the water level is normal, water flows from upstream to downstream in the waterway, fulfilling its role as a waterway. However, when the water level on the downstream side rises and approaches warning water level B, the float 17 receives buoyancy and closes the connecting rod. 21 to push up the support arm 6. At the same time, the support arms 6, 6 with the bearing pins 7, 7 as fulcrums and the gate 1 connected by the connecting rods 4, 4 descend according to the action of buoyancy, and the gate descends to position F.

When the water level further rises and reaches the position C, the float 17 rises to the position C', and the gate 1 descends to the position G (dotted chain line), becoming fully closed.

If the water level decreases, the float 17 will follow the water level due to the weight effect of the balance weight 14.
The position changes from B' to A', and the gate 1 returns to position E (fully open) and is held there.

In this way, due to the effect of buoyancy as the water level rises, the gate opens and closes (up and down movement) following the rise and fall of the water level using the lever principle using the bearing pins 7, 7 of the support arms 6, 6 as fulcrums. be exposed.

Furthermore, since the water inlets 28 and 28 in the pit communicate with the waterway, the water level is always the same as the height of the waterway, and is not directly affected by variable speed flow or waves during reverse flow, so the vertical movement of the float 17 is limited. It is extremely slow, and the opening and closing of the gate is correspondingly slow.

Further, although the present invention has mainly been described as a device for preventing backflow from downstream and from the coast, it is of course also applicable to water intake or water diversion from the upstream side.

(Effects of the invention) As described above, this device has a simple structure and can control the opening and closing of the gate unmanned and without power, so the equipment cost is low and there is no problem in the event of a power outage due to a lightning strike, etc. The main feature is that it has a mechanism that operates reliably by following the water level without causing any damage, and by simply setting only the planned water level position at the beginning, it can be used as a backflow prevention device to fully prepare for flood damage. It also has a remarkable effect when used as a water level adjustment device for water intake from upstream and water diversion to tributaries.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram illustrating the state of the support arm and the opening/closing position of the gate as the water level changes on the downstream side. FIG. 2 is an explanatory plan view of FIG. 1. 1...Gate, 2...Door stop, 4...Connecting rod,
6...Support arm, 14...Balance weight,
17...Float, H...upstream side, L...downstream side.

Claims (1)

[Claims] 1. A non-powered, balance weight opening/closing gate equipped with a pit communicating with a waterway, with a support arm having a fulcrum, one of the support arms having a gate that can be moved up and down via a connecting rod, and the other having a sliding gate. An automatic backflow prevention device for waterways characterized by the installation of a freely adjustable balance weight and float.