JP3352741B2 - Waterway switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inflatable bag made of a flexible film.
The present invention relates to a water channel opening and closing device that opens and closes water channels such as gutter gates and water supply and sewerage systems by contracting.

[0002]

2. Description of the Related Art Conventionally, in opening and closing gutters, water and sewage systems, sediment discharge passages of dams, etc., steel opening and closing devices having gate columns have been mainly used. However, this switchgear is heavy in weight, and requires a great deal of cost for foundation work and the like, and it is difficult to install the switchgear on a site with weak ground. In addition, there were cases where driftwood or the like was caught on the gate poles, or the water passages could not be completely shut off due to earth and sand that could flow into the sluice gates and not be discharged to the outside.

Therefore, as shown in FIGS.
A water passage opening / closing device 01 equipped with a water passage (see JP-A-4-293809) has come to be used. The bag body 02 overlaps a rectangular flexible membrane 03 whose width is set to a width slightly larger than about half the circumference of the water passage 07 on an air-tight sheet 04 formed in the same shape, A pair of sides 03a, 04a having a length of about half of the circumferential length is perpendicular to the longitudinal direction of the water passage 07, and the other pair of sides 03b, 04b is a longitudinal portion of the wall surface 07a facing the water passage 07. In parallel with the water passage 06
After closely adhering and extending along the opposing wall surface 07a and one wall surface 07b sandwiched between the opposing wall surfaces, the ends of the rectangular flexible film 03 and the airtight sheet 04 are pressed against a presser foot 05 and a number of anchors. It is air-tightly fixed with bolts 06 and formed in a bag shape.

When the air is supplied from the blower 09 through the air supply / exhaust pipe 08 into the bag body 02 in a state where the gate valve 010 is opened and the exhaust valve 011 is closed, the water passage opening / closing apparatus 01 is opened. When the bag body 02 expands to fill the inside of the water passage 07 and closes the water passage 07 and the air is discharged from the bag body 02 by opening the gate valve 010 and the exhaust valve 011, the bag body 02 contracts. The water passage 07 is opened.

[0005]

However, in the above-described conventional water passage opening / closing device 01, since the bag body 02 expands in a gentle curved shape, the water passage opening / closing device 01 has a rectangular cross section. When applied to water channel 07, especially as shown in Fig. 11,
In some cases, it is difficult for the bag body 02 to adhere to the corner portion 07c of 07, and a slight gap may be formed. Water leakage is likely to occur from this portion, and the water stopping performance may be poor.

The portion of the bag body 02 fixed to the wall of the water passage 07 by the presser foot 05 bends at a considerable angle when the flexible membrane 03 expands.
There was a case where it was difficult to adhere to 05, and a slight gap might be formed near the holding metal fitting 07d of the water passage 07.

[0007] Further, the bag body 02 allows the water passage to be formed.
In order to close and shut off water 07, pressurized air must be supplied into the bag body 02 until the internal pressure inside the bag body 02 becomes higher than the head pressure of the water level where the water passage 07 is located. Instead, the bag 02 needs to have a strength capable of withstanding the considerable internal pressure, and further requires a blower 09 capable of supplying air at a pressure higher than the internal pressure in the bag 02.

[0008]

SUMMARY OF THE INVENTION The present invention relates to an improvement of a water passage opening / closing device which overcomes the above-mentioned disadvantages. The outer peripheral edge of the flexible membrane is provided airtight by a presser foot, and fluid is supplied and discharged into the flexible membrane bag body constituted by the flexible membrane, and the flexible membrane bag body expands and contracts. Thereby, in the water channel opening / closing device that opens and closes the water channel, the flexible membrane bag body projects from the upper half of the circumferential surface of the opposed water channel in the cross-sectional direction of the water channel toward the center of the water channel. The ridge is projected, and the inner peripheral surface of the ridge that the flexible membrane contacts when the flexible membrane bag is inflated is formed into a gentle curved surface, and the lower end of the ridge is The presser foot is formed in a shape that can be in close contact with the upper half outer peripheral portion and the top edge.

Since the first aspect of the present invention is configured as described above, the fluid in the flexible membrane bag is discharged, and the flexible membrane bag is contracted in the contracted state. The flexible membrane is in close contact with the lower half of the peripheral surface of the water passage, and only the presser foot for bringing the outer peripheral edge of the flexible membrane into close contact with the peripheral surface of the water passage slightly projects into the water passage. Is extremely low. And, in the upper half of the water channel peripheral surface, even if a ridge is provided to project toward the center of the water channel across the flow channel direction of the water channel, the flow cross-sectional area of the flow channel is not so large as to the left. At the time of normal water flow of less than half, the flow path resistance of the portion provided with the water passage opening / closing device is as low as the flow passage resistance of the water passage not provided with the water passage opening / closing device. Further, even when the water flow rate is large, the inner peripheral surface of the ridge is formed into a gentle curved surface, and the lower end of the ridge is formed on the upper half outer peripheral surface and the top edge of the presser foot. Since the protrusions are formed in a shape that can be in close contact with each other, the protrusion amount of the ridge is small, and the increase in water passage resistance is not so remarkable.

Further, according to the first aspect of the present invention, the inner peripheral surface of the ridge contacting the flexible membrane when the flexible membrane bag is inflated is formed into a gentle curved surface, Since the lower end portion is formed in a shape that can be in close contact with the upper half outer peripheral portion and the top edge of the presser foot, the flexible membrane is closed in a water passage closed state by supplying a fluid to the flexible membrane bag body. Even if the fluid pressure in the bag-making body is not increased so much, the flexible membrane can be in close contact with the gentle inner peripheral surface of the ridge in a watertight manner, and the flexible membrane can be provided at the place where the presser foot exists. It is possible to make watertight contact with the ridge, and it is possible to reliably avoid water leakage and to reliably block the water passage.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in FIGS. 1 to 8 will be described below. The water channel opening and closing device 1 includes a bag body 2 composed of a flexible membrane 3 and an airtight sheet 4, a presser foot 5, an anchor bolt 6, a water channel 7, a ridge 8, a supply / exhaust pipe 9, a gate valve 10,
It comprises an exhaust valve 11 and a blower 12.

The flexible membrane 3 and the airtight sheet 4 are formed in a substantially rectangular shape with four corners slightly wider than about half of the circumference of the water passage 7 obliquely omitted. The airtight sheet 4
Of both sides of the airtight sheet 4 is placed slightly higher than the center of the vertical height of the side walls 7a of the water passage 7
4b is disposed below the bottom surface 7b of the water passage 7 and the side wall surface 7a adjacent thereto.

After the flexible film 3 having the same shape as the airtight sheet 4 is overlaid on the airtight sheet 4, the side edges 3a, 4a of the flexible film 3 and the airtight sheet 4 are removed. The edges 3b, 4b of the flexible membrane 3 and the airtight sheet 4 are applied to the bottom wall 7b of the water passage 7 by applying pressure to both side wall surfaces 7a of the water passage 7 and being pressed by the holding bolts 6 with the presser foot 5, respectively. Sticks tightly. Thus, the bag 2 is formed by the flexible film 3 and the airtight sheet 4.

A supply / exhaust pipe 9 is connected to the bag body 2 via a joint (not shown). A gate valve 10, an exhaust valve 11, and a blower 12 are connected to the supply / exhaust pipe 9 as shown in FIG. I have.

Further, the water passage 7 is provided at a position substantially half of the longitudinal direction of the bag body 2 over the circumferential direction of the water passage 7.
Projections directed in the circumferential direction of the water passage 7 as shown in FIG. 3 are formed on the wall surface where the bag body 2 is not disposed, that is, on the upper half of the side wall 7a on both sides of the water passage 7 and the top floor wall 7c of the water passage 7. A ridge 8 is provided integrally with the water passage 7. The ridge 8 is a water channel 7
Of the flexible film 3 when the bag 2 is inflated.
The inner peripheral surface 8a with which is contacted is formed as a gentle curved surface as shown in FIG. The lower end 8b of the ridge 8 is formed in a gentle arc so that the flexible film 3 does not bend at a considerable angle when expanded.

In the present embodiment, since the exhaust valve 11 is closed and the gate valve 10 is opened and the blower 12 is operated, air is supplied into the bag body 2 through the supply / exhaust pipe 9 because of the configuration as described above. The bag body 2 expands into a gentle curved surface, and the flexible membrane 3 is pressed tightly in the circumferential direction against the inner peripheral surface 8a of the ridge 8, so that the water passage 7 is closed.

Next, when the gate valve 10 and the exhaust valve 11 are opened, the bag 2 is pushed by the water pressure in the water passage 7, the own weight of the bag 2, the contraction force of the flexible film of the bag 2, and the like. The air in the bag 2 is released into the atmosphere through the exhaust pipe 9 while being crushed and contracted, and the bag 2 contracts and the water passage 7 is opened.

Since the ridge 8 is provided in the water passage 7 as described above, even if the cross section of the water passage 7 is rectangular,
Since the corners of the water passage 7 and the vicinity of the presser foot 5 are closed by the ridges 8, water leakage does not occur from these parts, and the water stopping performance is improved.

Further, as shown in FIG. 8, the internal pressure of the bag 2 and the tension T of the flexible membrane 3 along the longitudinal direction of the water passage 7.
Of the flexible film 3 due to T ₀ (= T cos θ) going outward.
Is pressed against the ridge 8, so that the water passage 7 can be closed even if the internal pressure of the bag body 2 is lower than the head pressure at which the water passage 7 is located. Therefore, it is possible to use the bag 2 whose strength is lower than that of the conventional one, and the required power of the blower 12 is reduced, so that the cost can be reduced.

Further, since the ridge 8 can be formed integrally with the water passage 7, the cost increase is not so large even if the ridge is provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a waterway opening and closing device according to an embodiment of the present invention when a bag is contracted.

FIG. 2 is a perspective view of the water passage opening / closing device of FIG. 1 when a bag is inflated.

FIG. 3 is a front view of the water passageway closing device of FIG. 1;

FIG. 4 is a longitudinal cross-sectional view of FIG. 1;

FIG. 5 is a longitudinal cross-sectional view of FIG. 2;

FIG. 6 is a longitudinal sectional view in the longitudinal direction of FIG. 1;

FIG. 7 is a longitudinal sectional view in the longitudinal direction of FIG. 2;

8 is an enlarged view of a main part of FIG. 7;

FIG. 9 is a perspective view of a conventional water channel opening and closing device.

10 is a longitudinal cross-sectional view of FIG. 9;

FIG. 11 is a longitudinal cross-sectional view of the conventional water passage opening and closing device when the bag is inflated.

FIG. 12 is a longitudinal cross-sectional view in the longitudinal direction when the bag body of the conventional water passage opening and closing device is inflated.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water channel opening / closing apparatus, 2 ... Bag body, 3 ... Flexible membrane, 4 ... Airtight sheet, 5 ... Foot, 6 ... Anchor bolt, 7 ... Water channel, 8 ... Ridge, 9 ... Supply / exhaust pipe , 10 gate valve, 11 exhaust valve, 12 blower

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02B 7/20 103 F16K 7/10

Claims (1)

(57) [Claims] 1. A flexible membrane is provided on the lower half of the circumferential surface of a water passage.
The periphery is airtightly attached by a presser foot to the flexible membrane.
Thus fluid is fed discharged configured flexible film bag body by the flexible membrane bag body is expanded and contracted, the water passage switching device for opening and closing the water conduit, the flexible membrane A ridge protrudes from the upper half of the peripheral surface of the opposed water passage of the bag-making body toward the center of the water passage in the direction of the cross section of the water passage.
Is, the inner peripheral surface of the ridges the flexible film during the expansion of the flexible membrane bag body contact is formed in a gently curved surface Rutotomo
The lower end of the ridge has an upper half outer peripheral portion and a top edge of the presser foot.
A water channel opening / closing device, which is formed in a shape that can be in close contact with the water channel.