JPS6286213A - Flexible film dam - Google Patents

Abstract

PURPOSE:To smoothen the flow of river water by providing any one or both of a recessed line and a projected line on the river bed where a flexible film dam is set. CONSTITUTION:When air in a flexible film dam 23 is discharged, curved portions 26 and 27 of a flexible film 24 are closed in a clasped form, and the lower part of the film 24 comes to follow a recessed line 21 and a projected line 22 formed on the river bed 20. The dam 23 can thus be fallen down under a condition that the rising portion of the film 24 is reduced. By providing one or both of a recessed portion and a projected portion on the river bed to lengthen the whole length of the river bed, the size of the film 24 to be floated in water can be minimized and the flow of river water can be smoothened when falling down the dam 23.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flexible membrane 1137 laid across a river, erected by supply of air, and lowered by discharge,
In particular, it relates to a flexible membrane weir installed at a location with a water level on the downstream side.

Flexible membrane weirs, commonly referred to as rubber weirs, are easy to construct and inexpensive to produce, and are widely used for agricultural water intake and as tide control weirs at estuaries.

In such flexible membrane weirs, a long flexible membrane (made of rubber or soft resin) is folded in half, both edges are aligned, and both edges are directed upstream. Either press it on the 1100 line pointing in the same width direction and fix it to the river bed surface to form a closed bag-like body, or in addition to the above structure, set an appropriate distance from the fixing position of both end edges. , the flexible membrane is held in a straight line parallel to the fixing line from inside the bag-like body. The latter flexible membrane weir, in which flexible membranes are fixed in two rows on the upstream and downstream sides, is particularly installed where there is deep water on the downstream side.

However, in a two-row fixed type flexible membrane weir, it can be raised and lowered by supplying and discharging air (venting);
In particular, the following problems occur when lodging in a place where there is deep water downstream.

ff16 Figure (a) shows the lodging process of the two-row fixed type flexible membrane 11ii02 laid on the river bed concrete 01 as a longitudinal side view, and the flexible membrane weir 02 is shown in Figure (a). As shown in the figure, the upstream side fixed line A and the downstream side fixed line B are fixed to the river bed concrete 01 and installed. Moreover, in the inner chamber of the flexible membrane weir 02 installed in this way, the river bed concrete 1'0 of the inner chamber of the flexible membrane weir 02 is installed.
1 or a vibrator and spacer for supplying and exhausting air onto the flexible membrane at the part where the flexible membrane extends from the fixed line B and reaches the fixed line A and is fixed = 03
and a structure in which a plurality of spacers S are attached at predetermined intervals along the inner circumferential direction of the flexible membrane weir 02 on the upstream side of the river and in the longitudinal direction of the flexible membrane weir 02. flexible membrane 9
02 is often used.

However, unlike the water-type flexible membrane weir, the flexible membrane weir 02 constructed in this way is different from the water-type flexible membrane weir, and when the filled air is vented at the time of lodging, at the initial stage, As shown in Fig. 6 <b), the flexible membrane weir 02 is gently deformed inwardly in the upper vicinity of fixed lines A and B fixed to the river bed concrete 01 due to river water pressure and air removal. to form curved portions 05.06. As the filled air is further discharged, the curved part 05.06 formed in the flexible membrane dam 02 is pressed against it and eventually becomes the flexible membrane dam 02 in a state of palms together, deviating from its function as a dam. It becomes possible to lie down.

Therefore, even if the flexible membrane dam 02 is evacuated and laid down 14, there is still a large amount of water inside the flexible membrane dam 02 as shown in FIG. 6(C). The inner chamber upper portion C of the flexible membrane dam 02 is deformed and curved within the range of the flexible membrane curvature, and the flexible membrane is formed by stacking and bonding two sheets, and the curvature of the flexible membrane is The junction part is deformed and curved within the range of , and the flexible @membrane j [! i02 is folded together and a gap is formed around the top part E formed within the range of the curvature of the flexible membrane dam 02 or the spacer S provided on the inner wall of the flexible membrane dam 02. Since an air chamber is formed in each of the spaces, each air chamber is formed by the spacer S provided in the longitudinal direction of the flexible membrane dam 02 and in the circumferential direction of the upstream inner wall of the flexible membrane 11i02. Filling air remains. Therefore, the buoyant force of the air remaining in this air chamber exceeds the underwater weight of the flexible membrane weir 02, making it difficult for the flexible membrane weir 02 to be forcibly collapsed, and the flexible membrane weir 02 becomes underwater. Floating on.

Therefore, the present invention relates to a new flexible membrane weir which overcomes these difficulties, and which is suitable for rivers with a water level on the downstream side. across the river, separate both edges of the flexible membrane and fix it to the riverbed to supply air.
In a flexible membrane weir that rises and collapses due to discharge, the riverbed surface sandwiched between both side edges of the flexible membrane is covered with either a convex surface or a concave surface oriented in a direction parallel to the both side edges. When the flexible membrane weir is collapsed, the upright flexible membrane of the flexible membrane weir is formed on one or both of the convex and concave surfaces of the riverbed surface. The total circumference of the river bed portions formed on one or both of the riverbed portions accommodates the circumference of the flexible membrane, so that the flexible membrane can be completely laid down without being suspended in water.

child's father-in-law DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below using illustrated embodiments.

Figure 1 shows the lodging process of the first embodiment in which convex stripes are formed on the river bed surface of a flexible membrane weir, and Figure 1 (a)
, reference numeral 1 denotes a riverbed section dyed with concrete or the like, and on the riverbed section 1 there are flexible membranes fixed to fixed lines A and B of the riverbed section 1 with both side edges of the flexible membrane 4 separated. sexual membrane weir 3
are laid so that they can be raised and lowered by supplying and discharging air (ventilation), and on the surface of the river bed section 1 sandwiched between both side edges of the flexible membrane 4. A plurality of cross sections oriented in parallel directions are formed with semicircular convex stripes 2 spaced apart from each other.

Further, the flexible film 4 is formed on the surface of the small number of convex stripes 2.
The downstream side of the bag is fixed by a fixed line B and extends to cover the flat riverbed 1 and the convex surface 2, and is fixed by a fixed line A to form the inner chamber of the bag-like body. Such an interior room is
This is an air chamber when the flexible membrane dam 3 is erected.

Furthermore, the flexibility II! A spacer 8 is attached to the upstream inner wall surface of the flexible membrane 4 over approximately half of the circumferential direction of the flexible membrane 4, and the spacer S is oriented toward one side edge of the flexible membrane 4. When the air filling the flexible membrane dam 3 is evacuated to prevent the flexible membrane dam 3 from collapsing, the flexible membrane dam 3 is provided with a This is a means of forming an air passage.

Furthermore, at the lower corner of the inner chamber of the flexible membrane weir 3, there is provided a supply/exhaust pipe 5 for supplying air into the flexible membrane weir 3 or discharging air from the inside of the flexible membrane weir 3. We are prepared.

FIG. 1(b) is a sectional view illustrating the initial air evacuation state, and when the air evacuation starts, the upper side of the fixed line △, B is connected to the water pressure on the upstream and downstream sides, and the filling As the air decreases due to air evacuation, they begin to curve inward in a substantially symmetrical manner to form curved portions (occlusion portions) 6.7 which are curved and deformed. FIG. 1(C) is a cross-sectional side view showing the collapsed state, and as air is removed from the inner chamber of the flexible membrane 4, the curved portions 6, 7
becomes a closed state, and eventually the convex surface 2
The upright flexible membranes 4 of the flexible membrane dam 3 are oriented in a direction parallel to the convex stripes 2 of the river bed 1, that is, both side edges of the flexible membranes 4, and are arranged at equal intervals. A plurality of convex stripes (in this example, two stripes) 2.2 are symmetrically oriented at the midpoints thereof and sandwiched between the circumferential length of the convex stripes and both side edges of the flexible membrane 4, respectively. The flexible membrane 4 is suspended in water so that the total peripheral circumference of the flexible membrane 4 during the closed period is within the total circumference of the flat part of the river bed 1, which is 81. ing.

Since the first embodiment shown in FIG. 1 is constructed as described above, when the air filled in the upright flexible membrane dam 3 is evacuated and the flexible membrane 4 is collapsed, the Flexible membrane weir 3
The symmetrical curved portions 6.7 of the flexible membrane 4, which begin to close due to water pressure and air evacuation, are closed in a state of palms together, and the flexible membrane 4 in the lower portion of the curved portion (occlusion portion) 6.7 The membrane 4 can be laid down in a state in which the membrane 4 is aligned with the flat part of the river bed section 1 and the peripheral surface of the convex striped surface 2, and the remaining length of the flexible membrane 4 is minimized.

Figure 2 shows the lodging process of a second embodiment in which grooved surfaces are formed on the river bed surface of a flexible membrane weir, and Figure 2 (a)
, reference numeral 10 denotes a riverbed section dyed with concrete or the like, and on the riverbed section 10 there are flexible membranes fixed to fixed lines A and B of the riverbed section 10 with both side edges of the flexible membrane 13 separated. A flexible membrane weir 12 is installed so that it can be raised and lowered by supplying and discharging air (air extraction), and the flexible membrane 12 is installed on the surface of the riverbed section 10 sandwiched between both side edges of the flexible membrane 13. The flexible membrane 13 is oriented in a direction parallel to both side edges of the flexible membrane 13 .
Concave surface 11 with a curved surface oriented in the opposite direction to the upright state of
will be established.

Furthermore, while the downstream side of the flexible film 13 is fixed to the peripheral surface of the grooved surface 11 with a fixing line B, the grooved surface 11 is
It covers and extends and is fixed at a fixing line A to form the inner chamber of the bag-like body. Such an inner chamber is formed by the flexible membrane dam 12.
It is an air chamber when standing up.

Further, a suberly 8 is attached to the upstream inner wall surface of the flexible film 13 over approximately half of the circumferential direction of the flexible film 13, and the spacer S is attached to the inner wall surface of the flexible film 13 on the upstream side. In the direction pointing towards one side edge of ? ! Two or more IIQ IIs are provided spaced apart from each other, and when the air filled in the flexible membrane dam 12 is evacuated and the flexible membrane dam 12 is laid down, the inner chamber of the flexible membrane dam 12 is This is a means of forming air passages.

In addition, in the vicinity of the upstream fixed line A of the inner chamber of the flexible membrane 1[12, air is supplied to the inner chamber of the flexible membrane @12 or the inner chamber of the flexible membrane weir 12 is supplied. It is equipped with a sleeve for releasing air and a discharge pipe 14.

FIG. 2(b) is a cross-sectional side view illustrating an initial air removal state, and in FIG. 2(b), the flexible membrane dam 13 is
When air removal begins, the upper sides of fixed lines A and B begin to curve inward in a nearly symmetrical manner as the water pressure and air on the upstream and downstream sides decrease due to ventilation, resulting in a curved part (occlusion part).15. form 16.

FIG. 2(C) is a sectional view showing the collapsed state, and FIG.
In C,), as the air in the interior of the flexible membrane 13 progresses, the curved portion 15.16 becomes closed, and
Ultimately, the convex surface 11 is relative to the deepest part of the concave surface 11 where the flexible film 13 is oriented in a direction parallel to both side edges of the flexible film 13. The top and upstream and downstream sides are bent within the range of the curvature of the flexible film 13 while along the flexible film 13 attached to the circumferential surface of the four-striped surface 11. The circumferential length of the flexible membrane 13, 13 excluding the palm-clasped portion is formed so that it can be easily accommodated by the weight of the flexible membrane 13 in water.

Since the second embodiment shown in FIG. 2 is constructed as described above, when the air filled in the upright flexible membrane dam 12 is evacuated and the flexible membrane 13 is collapsed, The flexible membrane dam 12 is a symmetrical musical part (occluding part) Is of the flexible membrane 13 that starts to be closed by water pressure and air removal.
16 is closed in a state of palms together, and the curved part (occluded part) 15
．． The flexible membrane 13 in the lower part of the river bed 10
Along the circumference of the grooved surface 11 formed on the surface, and
The flexible membrane 13 can be easily lowered into the concave surface 11 and laid down with a small surplus length.

Fig. 3 shows the lodging process of a flexible membrane weir of the third embodiment, which has four protruding protrusions and two convex protrusions formed on the river bed. is a riverbed section dyed with concrete or the like, and the riverbed section 20 is provided with a flexible membrane 2.
4 and fixing lines A and B of the riverbed 20.
A flexible membrane 1 (123) fixed to the riverbed section 20 is installed so that it can be raised and lowered by supplying and discharging air (ventilation), and the flexible membrane 1 [123] A grooved surface 21 having a curved surface oriented in a direction parallel to both side edges of the flexible membrane 24 and opposite to the upright state of the flexible membrane 24; A convex strip surface 22 having a semicircular cross section is provided in combination at symmetrical positions in the circumferential direction.

In addition, the flexible film 2
The downstream side of the bag 4 is fixed by a fixing line B and extends to cover the respective peripheral surfaces of the concave striped surface 21 and the convex striped surface 22, and is fixed by a fixing line A, thereby forming the inner chamber of the bag-like body. This inner chamber is an air chamber when the flexible membrane dam 23 is erected.

Further, a spacer 8 is attached to the upstream inner wall surface of the flexible membrane 24 over approximately half the circumference of the flexible membrane 24, and the spacer S is attached to the upstream inner wall surface of the flexible membrane 24. The flexible Il! This is a means for forming an air passage in the interior of the flexible membrane dam 23 when the air filled in the dam 23 is evacuated and the flexible membrane dam 23 is collapsed.

Furthermore, the flexible film Il! Air supply to the inner chamber of the weir 23 or supply for venting the inner chamber of the flexible membrane weir 23;
The discharge pipe 25 is still attached.

FIG. 3(b) is a cross-sectional side view illustrating the initial ventilation state. In FIG. 3(b), the flexible membrane dam 24 moves to the fixed line Δ when air removal begins.

As the water pressure and air on the upstream and downstream sides decrease due to ventilation, the upper side of B starts to curve inward in a nearly symmetrical manner, forming a curved part (occlusion part) 26.27.

Figure 3 (C) shows the collapsed state. 3(C), which is a sectional side view of FIG. 3, as the air in the inner chamber of the flexible membrane 24 progresses, the curved portions 26 and 27 become open base-like ffp, and eventually, Each circumferential surface of the convex striped surface 22 formed symmetrically with the circumferential surface of the grooved striped surface 21 is formed such that the flexible film 24 is oriented in a direction parallel to both side edges of the flexible film 24. The flexible film 24 is oriented relatively to the deepest part of the grooved surface 21 and attached to the circumferential surfaces of the grooved surface 21 and the convex surface 22. The circumferential length of the flexible membrane 24, which is bent within the range of the bending ratio of the flexible membrane 24 and the upstream and downstream sides of the flexible membrane 24°24, can be easily accommodated by the underwater weight of the flexible membrane 24. It is formed like this.

Since the third embodiment shown in FIG. 3 is configured as described above, when the upright flexible membrane dam 24 is pressed down, the flexible membrane dam 23 is controlled by the water pressure and the air vent. The respective relative curved portions (occluded portions) 26 and 27 of the flexible membrane 24 that start to be occluded are closed in a state of palms together, and the flexible membrane 24 in the lower portion of the curved portions (occluded portions) 26 and 27 The membrane 24 is placed along the combined circumferential surface of the concave striped surface 21 and the convex striped surface 22 formed on the surface of the riverbed section 20, and the flexible membrane 2
With the remaining length of the groove 4 made small, it can be easily fallen onto the combined circumferential surface of the concave surface 21δ and the convex surface 22 and laid down.

FIG. 4 is a sectional side view showing a fourth embodiment of a flexible membrane in which the width of the grooved circumferential surface of the river bed and the flexible membrane falling into the grooved circumferential surface are the same size; In Figure 4(a), 30
is a riverbed section dyed with concrete or the like, and a fixed line A of the riverbed section 30 is attached to the riverbed section 30 by separating both side edges of two flexible membranes 33 cut to the same width and having their palms joined together. ,
A flexible membrane weir 32 fixed to B is installed so that it can be raised and lowered by supplying and discharging air (air extraction). A curved concave surface 31 is formed on the surface of the flexible member 11933 in a direction opposite to the upright state of the flexible member 11933.

The circumference of the grooved surface 31 is the same as that of the flexible membrane 3 that stands up.
3 is formed to have approximately the same dimension as the circumferential length of the lodging deformation.

Further, on the circumferential surface of the grooved surface 31, one of the flexible membranes 33 is laid along the circumferential surface, and the other one is laid along the circumferential surface of the one flexible membrane 33. It is attached to both side edges with its palms together and fixed at fixing lines A and B on the plane of the river bed 30 to form an inner chamber of the bag-like body.

This inner chamber is an air chamber when the flexible membrane dam 32 is erected.

Further, spacers S are provided on the inner wall surface of the flexible bamboo membrane 33 described in 6a in the same manner as in the first to third actual flow examples described above, and spacers S are provided in the inner chambers of the flexible membrane 33 as well. Similarly to the third embodiment, supply and discharge pipes 34 for supplying and discharging air are respectively attached or provided, and the spacer S and the supply and discharge pipes 34 are connected to the first to third embodiments described above. Since there is no substantial difference from the third example, a description of its operation will be omitted.

FIG. 4(b) is a cross-sectional side view showing the collapsed state of the flexible membrane dam 32, and in FIG. 4(b), the flexible IFJ
33 In the final stage of venting the inner chamber, the upright flexible membrane 33 falls down along the circumferential surface of the flexible membrane 33, one of which is attached to the grooved surface 31. Form a prostrate state with your palms clasped together.

Since the fourth embodiment shown in FIG. 3 is constructed as described above, when the upright flexible membrane 33 is brought down,
The circumferential length of the flexible membrane 33 to which the flexible membrane 33 is deformed is the concave surface 3.
1, the flexible membrane 33 which was standing upright is attached to the concave surface 31, and the flexible membrane 33 is placed on one of the flexible membranes 33 with its palms together. Since the flexible membrane 33 is laid down while forming the flexible film 11Q33.33, it can be laid down in a stable state without leaving any extra length on the flexible membrane 33 that had been upright.

FIG. 5 shows a modification of the first embodiment in which a structural member is provided to form a convex strip on the flexible membrane on the plane of the river bed of a two-row fixed type flexible membrane weir. In Fig. 5, 40 is a river bed dyed with concrete, etc., 41 is a flat river bed sandwiched between both edges of the flexible membrane, 42 is a flexible membrane weir, and 43 is a riverbed portion of the flexible membrane weir 42. The flexible membrane 45 has two strips placed and adhesively fixed on the surface of the flexible membrane 43 sandwiched between both side edges of the flexible membrane 43 in parallel to both side edges of the flexible membrane. is a structural member such as a vibrator (made of iron or hard resin) with a circular cross section, and the structural member 45 is placed on the inner surface of the flexible membrane 43 on the river bed plane part 41 and fixed. Since there is no substantial difference from the first embodiment shown in FIG. 1, the explanation of its structure and operation will be omitted.

The concave surface 11.21 sandwiched between both side edges of the flexible membrane of the river bed section 10.20, illustrated and explained in FIGS. 2 and 3 above, is the flexible membrane weir 12. When the flexible membrane weir 12.23 is in a high sitting height, the depth of the grooved surface 11.21 is adjusted and the height of the grooved surface 11.23 is lowered.
．． It is preferable to form the circumferential length of 21 to be long.

Further, each of the flexible membrane weirs 3.12.23.32.42 is laid across the river, and is sandwiched between the end side edges of the flexible membranes 4, 13.24.33.43. The flexible membrane 4゜13,
24.33.43 The flexible membrane is attached to the slope by forming a convex surface or four-striped surface such as the convex surface 2 or the concave surface 11 oriented in a direction parallel to both side edges of 43. 4.13.2
It is preferable that flexible membranes (not shown) at both ends of 4.33.43 be laid down along the convex striped surfaces or depressed on the four striped surfaces.

As described above, in the present invention, the river bed surface sandwiched between both side edges of the flexible membrane of the flexible membrane weir is provided with a convex strip surface J3 oriented in a direction parallel to the both side edges. The flexible membrane of the flexible membrane weir is formed on one or both of the convex and concave surfaces, so that the flexible membrane of the flexible membrane weir is formed on one or both of the convex and concave surfaces. Since the flexible membrane of the flexible membrane weir does not float in the water and obstruct the flow of the river, the lodging height can be lowered or completely lowered. Even in tide protection weirs and the like where the water level on the downstream side is high, it is possible to ensure a fully collapsed flexible membrane weir that facilitates the flow of rivers.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view showing the lodging process of a flexible membrane weir according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional side view showing the lodging process of a flexible membrane weir according to a second embodiment of the present invention. 3 is a sectional side view showing the lodging process of a flexible membrane weir according to a third embodiment of the present invention, and FIG. 4 is a sectional side view showing a flexible membrane weir according to a fourth actual flow example according to the present invention. Fig. 5 is a cross-sectional side view showing the standing and lying states of the
FIG. 6 is a cross-sectional side view showing a modification of the figure, and FIG. 6 is a cross-sectional side view showing a conventional flexible membrane weir in a collapsed state. DESCRIPTION OF SYMBOLS 1... Riverbed part, 2... Convex stripe surface, 3... Flexible membrane weir, 4... Flexible membrane, 5... Supply and discharge pipe, 6.7...
・Curved part (occlusion part), 10... Riverbed part, 11... Concave surface, 12... Flexible membrane weir, 13... Flexible membrane, 14... Supply, 1 no. 1 outlet pipe, 15.16... curved part (occlusion part), 20... riverbed part, 21... concave stripe surface, 22... convex stripe surface, 23... flexible membrane weir, 24...Flexible membrane, 25
...Sleeve, discharge pipe, 26.27...Curved part (occluded part)
, 30... River bed section, 31... Concave surface, 32... Flexible membrane weir, 33... Flexible membrane, 34... Supply, initial pipe, 40... River bed section , 41... Riverbed flat part, 42...
Flexible membrane weir, 43... Flexible FI membrane, 45... 8i structural member, Δ, B... Fixed line, S... Spacer.

Claims (1)

[Claims] In a flexible membrane weir that crosses a river with water level on the downstream side, separates both edges of the flexible membrane, fixes it to the river bed, and raises and collapses as air is supplied and discharged, both sides of the flexible membrane are fixed to the riverbed. 1. A flexible membrane weir, characterized in that a riverbed surface sandwiched between the edges is formed into one or both of a convex surface and a concave surface oriented in a direction parallel to the both side edges.