JP3074672B2 - Two-stage gate for sand discharge channel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage gate for opening and closing a sand discharge pipe which drains from the upstream side of a reservoir or the like and discharges sediment deposited in front of a dam such as a water intake.

[0002]

2. Description of the Related Art Sediment shaved in a flow path to a reservoir continually flows into the front of a dam together with flowing water, and is blocked and deposited here. Therefore, if left as it is, the capacity of the reservoir is reduced, and the function of the reservoir is reduced. A major cause of the decline. Therefore, a sand drainage pipe is laid at the bottom of the pond separately from the intake channel, and it is usually closed, but when the sedimentation proceeds at the bottom of the pond, it is opened and the sediment is guided and discharged. is there.

When the gate is opened to open and close the sand discharge pipe, the door body rises and the flow path opens, and the sediment flows out to the downstream side. However, not all the sand on the upstream side is wiped out. It is unavoidable that the earth and sand stay around the bottom of the hill while floating. If a conventional type of gate is used, after the desired sand is discharged, even if the door is lowered to close the flow path, an obstacle is sandwiched because the sediment remaining at the bottom of the pipe remains. In this state, the door body is not completely closed in the gate, so that water leaks continuously through the gap formed at the bottom, which often wastes valuable water resources.

Japanese Utility Model Publication No. 60-16660 discloses a device proposed by the applicant of the present invention to solve this problem. The gist of the device is as shown in FIG. An upper door body 104 and a lower door body 105 are mounted in a hollow case 103 having a downstream communication port 102 opened therein so as to be movable up and down, and rack gears (not shown) provided on the respective side surfaces are mounted on the side walls of the case 103. The two doors 104 and 105 move up and down in directions opposite to each other in response to the operation of the hydraulic cylinder 107 by being screwed with the pinion gear 106. The two doors 104 and 105 have circular openings 108 and 109 which are closed at the center of the case 103. When both openings overlap as shown in the figure, a flow path opens to allow the sediment deposited in the reservoir to flow out. The two doors move up and down in the opposite direction to open and close the flow path instead of the single door moving up and down in one direction as in the past. It is said that the conventional problem that it cannot be solved has been solved.

[0005]

It is undoubted that this prior art has solved to some extent the peculiar problem at the time of discharging the earth and sand by the sand discharge pipe using the principle of the two-stage gate. However, it cannot be denied that there is still room for a more complete solution. The main reason for this is that the sand discharge pipe is normally closed except during sand discharge, and the door faces the upstream side, and usually closes the pipeline communicating with the reservoir. If a large amount of sediment accumulates at the bottom of the pond, the need for sand removal will occur, and the two-stage gate will be fully opened. The opening of the two-stage gate is formed by the upper and lower doors slidably contacting each other in the front and rear directions.
When the door 9 is relatively wide and has almost no slope, it moves up and down together with the door body with the earth and sand placed on the lower half circles of the upstream and downstream opening surfaces. Immediately before the full closure, the earth and sand that has straddled the opening surface is likely to be caught from above and below and cannot be completely closed.

Since the specific gravity of soil is large, it is inevitable that it tends to settle to the bottom through reservoirs and channels. Stagnation always means sedimentation at the bottom, and it goes without saying that it is effective for the bottom of the flow path to be in communication even when the gate is opened for discharge. However, FIG.
In the prior art, the gate must be fully opened in order to communicate with the bottom of the flow path. In other words, since the upper and lower doors simultaneously move up and down in the opposite direction to open the communication port, only the bottom of the flow path is opened and only the sediment is washed away, while the upper half is closed and only the water is prevented from flowing out This is a configuration that cannot be performed. However, today, where chronic shortages of water are expected, such escape of wasteful water resources is often not allowed, and this is an issue that requires strict measures to be taken along with water leakage.

Further, in the prior art shown in the figure, the opening of the upper door must be lowered to a position corresponding to the opening of the lower door in order to fully open the door. In order to take up the storage space for the upper door body when fully closed, the overall height of the gate becomes extremely large, and an increase in the size of the device is inevitable. Due to the nature of the gate of the sand discharge pipe, space is often restricted due to its nature, so that it often becomes one of the problems.

In connection with this, when opening and closing the gate,
Due to the wide sliding range between the upper and lower doors, the frictional resistance during sliding increases sharply once small sand particles enter the interface between the two doors. Abrasion of the sliding surface and an unexpectedly large load on the driving source occur, which hinders smooth lifting and lowering of the door body, and in some cases, concerns that may cause a failure cannot be wiped out.

In order to solve the above-mentioned problems, the present invention is designed to prevent the door from being opened and closed by the soil that moves and accumulates in the water. It is an object of the present invention to provide a two-stage gate having a compact configuration having a function that can be adjusted so that sand can be efficiently discharged according to the requirements.

[0010]

According to the present invention, there is provided a two-stage gate of a sand discharge channel, which is capable of independently moving upward and downward within a hollow case 3 having an upstream communication port 1 and a downstream communication port 2 opened. Assuming that the body 4 and the lower door body 5 are slidably provided, the lower door body 5 is almost completely fitted into the bottom storage chamber 31 recessed at a position lower than the bottom surfaces of the two communication ports. The closing plate 50 is suspended from the upstream side via a side beam 52 fitted into the side surface of the case 3 and a part or all of the top surface of the closing plate 50 is at least the angle of repose of the earth and sand flowing down the flow path. upper door 4 at an inclination angle θ formed by the inclined surface 51 descending to the upstream side is adjacent said lower door body 5 and a downstream side, its
So that the bottom surface 48 is between the upper surface of the downstream communication port 2 of the case 3 to the seat 32 which is laterally placed approximately its mid-height
It is characterized by being suspended . Since the angle θ of this inclined surface is not less than the angle of repose at which sediment in the flow path cannot be retained, it is impossible for the sediment to accumulate on this inclined surface, and all of the material slides down to the upstream side. Touch is assured and complete flow path closure is maintained. At the same time, the upper door body and the lower door body are individually lifted and lowered by separate driving sources. For example, the upper door body is partially lowered while being lowered to the lowest position in the receiving seat, and the sediment accumulated flow path Opening only the lower half allows efficient sand removal and minimizes the escape of water. Further, the lowering limit of the upper door body is limited to the seat provided in the middle of the communication port, and the ascending / descending range is almost half of that of the conventional technology. At the same time, the area where the upper and lower doors overlap and the sides contact each other remains in a very limited narrow range when fully closed, so there is very little opportunity for earth and sand to enter the boundary between both doors. However, since the distance of mutual sliding is small, the fear of a sudden increase in frictional resistance disappears. As described above, all the above-mentioned problems are solved at once.

In the above basic configuration, the inclination angle θ is 25 to
A 45 ° angle is an empirically desirable embodiment. In this case, the sediment deposited in the flow channel has a unique angle of repose depending on various factors such as the particle size, shape, amount of deposition, water speed at the time of sand discharge, and water volume, but at least 25 ° is required. However, the higher the angle, the sharper the edge of the opening, and the more cavitation is concerned. Therefore, it is necessary to avoid tilting more than necessary.
It is desirable to set 5 °.

In the first or second aspect, the lower door body 5 slides in a watertight manner in the closing plate 50 and the side storage chamber 37 which projects laterally further from both sides of the communication port of the case 3. An opening 57 is formed by the upper beam 53 connecting the side spar 52 at the upper end, and the inclined surface 51 of the closing plate 50 rises to a position exceeding the bottom surface of the receiving seat 32 of the case. It is desirable that the structure 58 remains in the bottom storage chamber 31. According to this aspect, even when fully closed, a part of the lower door body is stored in the bottom storage chamber 31 in a watertight state, thereby preventing earth and sand from flowing into the bottom storage chamber. Are stored without any trouble and play a part in solving the problem.

Further, the case 3 has a side storage chamber 37 and a seat 32 projecting in two steps from the side surfaces of the two communication ports, and watertight plates 33 and 34 are attached to the inner surface of the seat 32 so that the upper door 4 is attached. The watertight plates 43 and 44 attached to the both side surfaces and the top surface on the downstream side are slidably pressed against each other, and the watertight plates 35 and
A sliding plate 54 and a watertight plate 56 attached to both sides and a bottom portion of the lower door body 5 on the upstream side of the lower door body 5 are slidably pressed to each other and a watertight plate 41 attached to the upstream bottom portion of the upper door body 4. It is desirable that the watertight plate 55 attached to the downstream top portion of the lower door body 5 be slidably press-contacted. This configuration is a part that guarantees the function of maintaining the watertightness of the entire gate, and particularly from the upstream side to the downstream side, in relation to the upper door body and the lower door body being operated independently by different drive sources, respectively. It shows a specific watertight structure for each door body alone or between both door bodies so that water leakage does not occur. Each sliding part is made of water-tight material such as metal touch with very narrow width or rubber, so it is easy to process, high precision and can be formed with few errors, and has a sealing function to protect it from intrusion of earth and sand. However, it is far superior to the conventional sliding of the entire surface of the door body, is extremely economically advantageous, and has a great advantage in implementation, which leads to spur of solving the problem.

[0014]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention. FIG. 1A shows a state in which a gate is fully opened, and FIG. The hollow case 3 has an upstream communication port 1 on the front surface and a downstream communication port 2 on the rear surface. The case 3 includes a bottom storage chamber 31 and the bottom storage chamber 31 is provided at a position lower than the communication port of the flow path, and the closing plate 5 of the lower door body 5 is provided.
Part or all of 0 (when fully closed) is stored. On the top surface of the case 3, a hydraulic cylinder 6, which is a drive source for raising and lowering the upper door body 4, and a hydraulic cylinder 7, which is a drive source for raising and lowering the lower door body, are placed side by side. Connects to the top surfaces of both doors.

When the door 3 is fully opened as shown in FIG.
Of the lower door body 5, the entire height of the closing plate 50 of the lower door body 5 is set substantially equal to the entire height of the bottom storage chamber 31 of the case 3, so that the entirety thereof fits inside the bottom storage chamber 31. The top surface is lowered to almost the same level as the bottom surface of the flow path. When the gate is fully closed as shown in FIG. 2B, the upper door body 4 is lowered to the seat 32 whose bottom surface 48 is laid on the side surface of the case 3 to close almost half of the total height of the communication port, while the lower door body 5 is closed. Rises to a position beyond the height of the seat 32. The upstream side of the upper door body and the downstream side face of the lower door body overlap in a narrow range, and the communication port is completely closed. Even when the door is fully closed, the bottom surface 58 of the lower door body 5 still stays in the bottom storage chamber 31 to prevent the earth and sand S from flowing into the bottom storage chamber 31. Since the top surface of the closing plate 50 is formed by the inclined surface 51 having an angle θ equal to or greater than the angle of repose of the earth and sand S, it is physically impossible for the earth and sand S on the upstream side to remain on this surface,
All the soil S that has climbed up slides down to the upstream side and cannot bite between the boundary surfaces on which both doors slide.

FIG. 2 is a front view of the upper door body 4, wherein FIG. 2 (A) is a view from the upstream side and FIG. 2 (B) is a view from the downstream side. On the upstream side of the door body, a watertight plate 41 is attached along a bottom surface 48, and on both sides a sliding plate 42 is attached. On the downstream side, a watertight plate 44 is attached along a top surface, and a watertight plate 43 is attached on both sides. ing. Further, as shown in detail in FIG. 3, reference numeral 45 denotes a watertight rubber which comes into contact with the receiving seat 32, and is attached to the upper door body 4 by a presser fitting 46 and a bolt 47.

FIG. 4A is a front view as viewed from the upstream side of the lower door body 5, and FIG. 4B is a side view of FIG. In the figure, the door body is formed by combining an obstruction plate 50, a side beam 52 connecting both side surfaces, and an upper beam 53 connecting the side beams at an upper portion, and forming an opening 57 in a window shape. The closing plate 50 has a top surface formed by an inclined surface 51 and a bottom surface 58 always accommodated in the bottom storage chamber 31 of the case. A sliding plate (also serving as a watertight plate) 54 is attached to both sides on the downstream side of the lower door body 5, and horizontal watertight plates 55 and 56 are attached to upper and lower ends of the closing plate 50, respectively.

FIG. 6 shows a schematic positional relationship of the sliding portion of the case 3 corresponding thereto. When the gate is fully closed, the watertight plate 33 of the case and the watertight plate 44 of the upper door body 4
The watertight plate 34 and the watertight plates 43 on both sides of the upper door 4 are in close contact with each other on both sides of the case. The seat 32 of the case 3 is in contact with the watertight rubber 45 of the upper door 4, and the watertight plate 41 of the upper door is in contact with the watertight plate 55 of the lower door 5. The watertight plates 35 on both sides of the case 3 and the watertight plate 54 of the lower door body 5 are in contact with each other.
The watertight plate 36 and the watertight plate 56 of the lower door body are in contact with each other. In this way, the gate is assured of reliable water stopping by the watertight plate or the watertight rubber. It is also possible to replace a part of the watertight plate with watertight rubber or to attach auxiliary watertight rubber to the watertight plate.

Although FIGS. 1 to 5 disregard the offset processing generally performed on the gate, the offset processing can be performed. Although not shown in the drawings, it is customary to use a guide hardware in order to move the door up and down accurately.

FIG. 7 shows another embodiment of the present invention, which is different from the embodiment shown in FIG. 1 and the like in that a partial inclined surface 51a is provided instead of making the top surface of the closing plate 50 an entire inclined surface. In this case, the slope is limited to the range where sedimentation affects the water stoppage.

[0021]

According to the present invention, as described above, the earth and sand located on the upper surface of the lower door body is going to be lifted as the lower door body is lifted when the gate is closed, but the slope of the top surface of the closing plate flows in. It is physically impossible to stay on the upper surface because it forms a gradient that is greater than the angle of repose of the sediment that has been brought down. Since the chance of being caught between the upper door body and the upper door body is completely lost, the effect is obtained that the gate is securely closed and water leakage is not allowed.

Since the sliding range of the upper door and the lower door is only a very limited range immediately before the fully closed state,
There is very little opportunity for earth and sand to bite between the sliding surfaces, and even if it does, the sliding distance is significantly shortened, so there is no possibility of developing a large frictional resistance. This leads to the elimination of a sudden increase in the load on the hydraulic cylinders that drive the upper and lower doors, and has a significant effect on gate maintenance.

Since the upper door body and the lower door body can be individually raised and lowered independently, it is possible to carry out an operation appropriately adapted to conditions such as the sedimentation state of the soil and the water level of the reservoir, and a wide range of operation conditions can be selected. Be born. For example, when saving water resources is prioritized during the drought season, an operation to open the bottom of the channel narrowly and intensively drain only the sediment is one of the meaningful measures.

In general, when considering the location where a drain pipe is installed, such as a dike or an intake tower of a reservoir, only a very restricted narrow case is often permissible. Significant reduction is a very advantageous condition for implementation. The reduction of the occupied space and the compactness of the device is one of the benefits that can be brought to the design, as well as to the actual use and its maintenance.

Regarding claim 2, the amount and properties of sediment that is scraped off from a river basin in Japan or washed away by a flood and flows to a reservoir has been investigated in detail for each river. The angle of repose for sediments sufficiently mixed with water is seen to be between 25-30 °. According to the present invention, it has been recognized that if the angle is set to 25 to 45 °, the function is sufficiently exhibited, and the angle of inclination is limited. Effect will accompany.

According to the third and fourth aspects, the mutual sliding portion between the upper door body and the lower door body is limited, thereby simplifying the work, improving the accuracy of the sliding surface, reducing the load on the driving source, and improving the convenience of maintenance. It is difficult to overlook the point that various advantages are enjoyed while using the gate.

[Brief description of the drawings]

FIG. 1 is a fully opened state (A) and a fully closed state (B) of an embodiment of the present invention.
It is a front view with a partially broken view of FIG.

FIG. 2 is a front view (A) and a rear view (B) of an upper door body of the present embodiment.

FIG. 3 is an enlarged view of a main part of FIGS. 2A and 2B.

FIG. 4 is a front view (A) and a side sectional view (B) of the lower door body of the present embodiment.

FIG. 5 is a front view (A) and a partial cross-sectional view (B) of the case of the present embodiment.

FIG. 6 is an exploded perspective view showing a positional relationship between a case, an upper door body, and a lower door body.

FIG. 7 is a partial cross-sectional view of a lower door body showing another embodiment of the present invention.

FIG. 8 is a longitudinal sectional front view showing an example of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upstream communication port 2 Downstream communication port 3 Case 4 Upper door body 5 Lower door body 6 Hydraulic cylinder 7 Hydraulic cylinder 31 Bottom storage room 32 Receipt 33 Watertight plate 34 Watertight plate 35 Watertight plate 36 Watertight plate 37 Side storage room 41 Watertight plate 42 Sliding plate 43 Watertight plate 44 Watertight plate 45 Watertight rubber 48 Bottom 50 Closure plate 51 Slope 52 Side girder 53 Top beam 54 Sliding plate 55 Watertight plate 56 Watertight plate 57 Opening 58 Bottom θ Slant angle S Sediment

Claims (4)

(57) [Claims] 1. A two-stage gate slidably provided with an upper door body 4 and a lower door body 5 which can be individually raised and lowered in a hollow case 3 having an upstream communication port 1 and a downstream communication port 2 opened. In the lower door body 5, the closing plate 50 which fits almost completely into the bottom storage chamber 31 recessed at a position lower than the bottom surface of the two communication ports is inserted through the side girder 52 fitted to the side surface of the case 3. While hanging on the upstream side, a part or all of the top surface of the closing plate 50 is formed by an inclined surface 51 descending to the upstream side at an inclination angle θ of at least the repose angle of the earth and sand flowing down the flow path, The upper door body 4 adjacent to the lower door body 5 on the downstream side is
The bottom surface 48 is located between the upper surface of the downstream communication port 2 of the case 3 and the receiving seat 32 which is laid at about half the height .
A two-stage gate in the sand discharge channel, which is suspended . 2. The method according to claim 1, wherein the inclination angle θ is 25 to 4.
A two-stage gate for a sand discharging channel, which is at 5 °. 3. The lower door body 5 according to claim 1, wherein
Is a closing plate 50, a side girder 52 sliding in a watertight manner in a side storage chamber 37 projecting laterally from both sides of the communication port of the case 3, and an upper beam connecting the side girder 52 at an upper end. 53
The opening 57 is formed by the inclined surface 51 of the closing plate 50.
The bottom gate 58 of the closing plate still stays in the bottom storage chamber 31 when is raised to a position beyond the bottom surface of the receiving seat 32 of the case. 4. The case according to claim 1, wherein the case includes a side storage chamber extending in a stepwise manner from the side surfaces of the two communication ports and a receiving seat, and the watertight plate is provided on an inner surface of the receiving seat.
3 and 34 are slidably pressed against sliding plates 43 and 44 attached to both sides on the downstream side of the upper door body 4 and the top surface, and watertight plates 35 and 36 are attached to the inner surface of the side storage chamber 37. And a sliding plate 54 and a watertight plate 56 attached to both sides and a bottom portion on the upstream side of the lower door body 5 in a slidable manner, and a watertight plate 41 attached to the upstream bottom portion of the upper door body 4. A two-stage gate for a sand discharge channel, wherein a watertight plate 55 attached to a downstream top portion of the lower door body 5 is slidably pressed against the watertight plate 55.