JPH0254015A - Flexible membrane weir - Google Patents

Abstract

PURPOSE:To prevent, without the need for a specific retainer, effect of excessive force to a flexible membrane at a place around an opening when the level of a river becomes higher at the downstream-side than the upstream-side by placing the opening for supply and exhaust pipings at a fixed position in the vicinity of a toe of slope. CONSTITUTION:Supposing a triangle T, of which two sides are respectively formed of a line extending, from a point P where toe of slope (n), forming a boundary between a river-bed surface 5a and a side slope 6a, intersects retainers 7, toward the downstream-side in a length (0.3l) in 30% of the fell- down width of a membrane dike and a line extending, from the point P, across the river in a length (0.3l), a port 10a for pipings for supply and exhaust of air, installed in the inside of the river-bed concrete, is opened to the inside of a bag of the rubber dike within the area of said triangle.

Description

[Detailed Description of the Invention] L! FIELD OF THE INVENTION The present invention relates to a flexible membrane weir that is laid across a river, etc., and that rises when fluid is introduced and collapses when it is discharged, and particularly relates to the connection between the membrane weir body and fluid piping. .

As shown in Figure 1, the rice and yam flexible membrane weir 01 is constructed by folding a flexible membrane in two, aligning both edges, positioning it on the upstream side, and laying it along the width of the river. Hold both end edges 01a with the presser foot 0
4, it is integrally attached to the river bed concrete 02, and the flexible l1111 is attached to the river slope concrete 03.
The left and right end edges 01b of 901 are integrally attached in a bag shape.

The ends of the fluid supply and discharge pipes 05 arranged in the riverbed concrete 02 are provided with fluid supply and discharge openings 06 at appropriate intervals where the riverbed surface 02a and the flexible membrane weir 01 come into contact. The fluid flows through the flexible WAiII pipe 05.
The flexible membrane dam 01 stands up, and the fluid is discharged through the same pipe 05 and falls down.

FIG. 2 is a sectional view showing a normal flexible membrane weir in an upright state.

A substantially horizontally buried pipe 05 rises at a suitable location, passes through the downstream part of the flexible membrane weir, and communicates with the interior of the membrane weir.

The membrane around the opening of the pipe 05 is the flange 07 at the mouth of the pipe.
is fixed from above by a dowel bolt 08.

Since the upstream water level is usually high, the flexible membrane weir 01 is pressed from the upstream side and has the shape shown in Figure 2, and the flexible membrane weir is supported by the attachment part on the upstream edge. There is.

Therefore, no load is placed on the flexible membrane around the opening 06 of the pipe 05.

However, if the water level on the downstream side rises for some reason and becomes higher than the water level on the upstream side, the flexible membrane weir 01 is agitated from the downstream side and moves and deforms upstream, as shown in FIG. This will apply unreasonable force to the membrane around the opening 06 of the pipe 05.

The flexible membrane in the same area will be stretched, and in the worst case, there is a risk that it will be damaged.

Therefore, as shown in FIG. 4, it is conceivable to fix the flexible membrane to the river bed from inside the flexible membrane dam 01 downstream of the pipe opening 06 using a presser foot 09, but this increases the cost.

The present invention by Ruta was made in view of this point, and its purpose is to prevent excessive force from being applied to the periphery of the pipe opening by providing the pipe opening at a predetermined position near the slope of the river bed. The object of the present invention is to provide a flexible membrane weir at a low cost that can prevent problems such as breakage.

That is, the present invention provides a flexible membrane weir in which a long flexible membrane is folded in two and both edges are aligned and fixed to a river bed and slope with both edges facing upstream. Openings for fluid supply and discharge piping are placed inside a triangle on the riverbed surface whose two sides are lines extending approximately 30% of the membrane weir collapse width from the fixed part of the flexible membrane to the downstream side and the opposite bank. This is a flexible membrane weir.

The upstream side edge of the flexible membrane weir is fixed to the slope in a straight line diagonally downstream from the foot of the slope, so even if it is stirred from the downstream side, the flexible membrane near the fixed part will be fixed. The weir never leaves the river bed.

Therefore, since the piping opening is provided in such a portion, no load is always applied to the periphery of the piping opening, and problems such as breakage do not occur.

Furthermore, since the opening position of the piping is devised, there is no increase in cost, and the fixing of the flexible membrane around the opening does not have to be very robust, so it is possible to reduce costs.

Support 1 An embodiment of the present invention illustrated in FIGS. 5 to 11 will be described below.

A rubber ring 1, which is a type of flexible membrane weir, extends across the width of the river between the riverbed surface 5a of the riverbed concrete 5 and the slope concrete 6.
It is watertightly attached to the slope 6a of

The rubber ring 1 described above is made by impregnating raw rubber into a reinforcing layer made of one or more belt-like woven fabrics or fiber cords made of synthetic fibers, etc., and then folding the layers in half and superimposing them, and then vulcanizing and molding them. The main component is a belt-shaped rubber sheet 2.

Using such a band-shaped rubber sheet 2, a rubber ring 1 is laid on a river bed concrete 5 and a slope concrete 6 in the steps shown below.

First, as shown in FIGS. 5 to 9, at both longitudinal ends 2a of the band-shaped rubber sheet 2 corresponding to the slope 6a of the slope concrete 6, both ends 3a of the overlapping side edges 3 are is cut diagonally toward the bent portion 4 of the band-shaped rubber sheet 2, and the riverbed surface 5a of the riverbed concrete 5 and the slope concrete 6 are cut with the overlapping side edge 3 of the band-shaped rubber sheet 2 located on the upstream side. A presser foot 7 is applied over the slope 6a of the riverbed concrete 5 and the slope concrete 6.
The overlapping side edge 3 and the presser foot 7 are fitted to the anchor bolt 8 implanted in the anchor bolt 8, and the nut 9 is inserted into the anchor bolt 8.
are screwed together and tightened.

In the plan view illustrated in FIG.
A line segment with a length of about 30% of the membrane weir lodging width 1 to the downstream side along the slope n, and a line segment with a length of about 0.3JI from the intersection P to the opposite shore with the same width. Considering a triangular part molecule (shown with diagonal lines) having two sides, the tip opening 10 of the supply/exhaust pipe 10 disposed inside the river bed concrete 5 in the triangular part molecule.
A is opened inside the bag.

The base end of this supply/exhaust pipe 1G is located in the operation chamber 16 and is connected to a blower (not shown) via a base end valve 12. By opening this pulp 12 and operating the blower, The rubber weir 1 can be erected by introducing air into the rubber weir 1.

As shown in FIG. 8, the structure of the opening portion of the supply and exhaust pipe 10 is such that the supply and exhaust pipe 1G arranged in the concrete floor 5 is curved upward to the downstream side of the rubber sheet 2 in the triangular part molecule. A 7 flange 11 formed at the tip of the supply/exhaust pipe 10 passes through an oval hole provided in the piece 2b, and the rubber sheet 2
The periphery of the circular hole is pressed down from above.

A bolt 13 planted in the river bed concrete 5 at the peripheral edge of the circular hole of the belt-shaped rubber sheet 2 penetrates the downstream piece 2b of the rubber sheet 2 and the flange 11 and protrudes upward. 14 are screwed together and the band-shaped rubber sheet 2 is tightened and fixed.

In the membrane weir bag body, two communication lines 1115 are provided above the opening 12a, parallel to the presser foot 7, extending from one slope to the other slope in the direction of rotation. A gap extending in the opposite direction is always formed to prevent the piping opening from being clogged and the end of the pipe from being clogged, thereby avoiding the formation of air pockets.

6 to 9 show the upright state of the rubber weir 1 when the water level on the upstream side is full and the water level on the downstream side is zero, and FIG. 8 is a sectional view taken along the line ■-■ in FIG. It shows the upright state near the foot of the slope n, and FIG. 9 is a sectional view taken along line IX-IX in FIG. 6, showing the upright state of the central part of the river.

In the vicinity of the slope n (see Fig. 8), the contact width of the portion where the downstream piece 2b of the rubber sheet is in contact with the riverbed surface is approximately 0.45 J, assuming that the width of the membrane weir collapse is 1.

Therefore, the triangular part molecule in which the piping opening 10a is located is included in the part that is in contact with the riverbed surface 5a.

In addition, in the central part of the river (see FIG. 9), the length of the part in contact with the riverbed surface 5a is 0.35.11.

Next, FIGS. 10 and 11 illustrate a situation where the downstream water level is full and the upstream water level is approximately zero.

Rubber weir 1 is pushed upstream by the pressing force on the downstream side, but
As shown in Figure 10, the standing state near the foot of the slope is the riverbed surface 5a.
is in contact with the pipe opening 10a with a length of 0.3 Jl.
matches or contains a certain triangular submolecule.

This is because both ends 3a of the band-shaped rubber sheet 2 are fixed to the slope concrete 6, which prevents the rubber dam 1 from moving upstream.

Since the above-mentioned regulation does not work in the center of the river, the movement due to stirring upstream is large, and as shown in FIG. 11, the contact width of the downstream piece 2b of the rubber sheet with the river bed surface 5a is
It has a length of s 1 to 0.1A.

As described above, since the triangular part molecule having the pipe opening 10a is always in contact with the river bed surface, no excessive tensile force is applied to the rubber sheet around the periphery of the pipe opening 10a inside, so that the rubber sheet is not damaged. There are no problems.

Therefore, there is no need to firmly fix the rubber sheet around the opening to the river bed surface, so it can be provided at a low cost.

In addition, the piping surface 1T11 is attached to the triangular part molecule along the foot of the slope.
By providing 0a, condensation (drain) that occurs inside the bag
If the pipe is sloped downward and extended to the operation chamber 16, when the valve 12 is opened, the drain can be removed together with the expansion medium.

Since the opening of the supply/exhaust pipe 10 is located near the end of the slope, the supply/exhaust pipe 10 can be shortened by providing the operation chamber 16 on the same opening side.

Further, since there is only one circular hole provided in the downstream piece 2b of the band-shaped rubber sheet 2 to match the supply/exhaust port, the airtightness of the bag body is maintained at a high level.

In this embodiment, the connecting portion of the supply/exhaust pipe 10 to the rubber dam is fixed by seven flanges 11 around the circumference of the circular hole in the band-shaped rubber sheet 2, but screw tightening may also be used.

That is, as shown in FIG. 12, the upper end of the upwardly facing supply and exhaust pipe 20 forms a conical opening 21, and
A female thread is formed on the inner periphery of the cylindrical portion that is continuous with the opening.

Then, when the screw 22 passes through the oval hole drilled in the downstream piece 2b of the band-shaped rubber sheet 2 from above and is screwed into the female thread of the supply/exhaust pipe 2G and tightened, the conical opening 22 of the supply/exhaust pipe 20 is tightened. The peripheral edge of the circular hole of the downstream piece 2b of the rubber sheet is sandwiched between the tapered surface of the screw 22 and the tapered surface of the neck of the screw 22 and tightened.

Since the screw 22 that fixes the band-shaped rubber sheet 2 at the pipe opening has a communication hole therein, the inside of the bag of the rubber dam 1 and the inside of the air supply/exhaust pipe 20 are communicated with each other.

Note that a protrusion 21a is formed on the tapered surface of the conical opening 21 of the air supply/exhaust pipe 20, oriented in the circumferential direction, and when the screw 22 is tightened, the protrusion 21a bites into the band-shaped rubber sheet 2. The circumferential edge of the circular hole in the band-shaped rubber sheet 2 is prevented from coming off.

By arranging the opening of the supply/discharge piping at a predetermined position near the bottom of the pipe, the present invention avoids applying excessive force to the flexible membrane around the opening, thereby preventing problems such as damage. This can be prevented from occurring.

In addition, the piping opening position has been devised and no special holding tools are required, so it can be provided at low cost.

Furthermore, in the case of a membrane dam that supplies and discharges gas, it also has the primary effect of removing the drain that accumulates inside the bag.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway perspective view of a conventional rubber weir in a collapsed state;
Figure 2 is a sectional view showing the normal upright state of the rubber weir, Figure 3
The figure is a sectional view showing the upright state of the rubber weir when the downstream water level is higher than the upstream water level, FIG. 4 is a sectional view showing another conventional rubber weir, and FIG. 5 is a sectional view of the rubber weir according to the present invention. FIG. 6 is an explanatory view of the rubber weir in the upright state as seen from the upstream side, FIG. 7 is a plan view of the same, and FIG. ■-■ cross-sectional view of the figure, Figure 9 is I of Figure 6.
X-TX sectional view, Fig. 10 is a sectional view near the foot of the rubber weir when the downstream side is at full water level, Fig. 11 is a sectional view of the rubber weir in the same state at the center of the river, and Fig. 12 is a different embodiment. FIG. 1... Rubber weir, 2... Band-shaped rubber sheet, 2a...
Both ends, 2b...downstream side piece, 2C...upstream side piece, 3...side edge, 4...bent part, 5...riverbed concrete, 5a...riverbed surface , 6... Slope concrete, 6a... Slope, 7... Presser foot, 8... Anchor bolt, 9... Nut, 10... Supply/exhaust pipe, 10
a... Opening, 11... Flange, 12... Pulp, 13... Bolt, 14... Nut, 15...
Communication pipe, 16... Operation room, 20... Supply and exhaust pipe, 21
... Conical face opening, 21a... Projection, 22... Screw. 1st m

Claims (1)

[Claims] In a flexible membrane weir in which a long flexible membrane is folded in half and both edges aligned and fixed to the river bed and slope with both edges facing upstream, the flexible membrane at the foot of the slope is The opening of the fluid supply and discharge piping is placed inside a triangle on the riverbed surface whose two sides are a line segment extending approximately 30% of the membrane weir collapse width from the fixed part to the downstream side and the opposite bank side. Features a flexible membrane weir.