JP2009052224A - Flexible membrane dam and method of producing flexible membrane dam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible membrane dam which is producible with higher productivity than ever, and to provide a method of producing the flexible membrane dam. <P>SOLUTION: A rubber sheet 20 constituting a rubber dam 10 has an outer skin rubber layer 22, a first reinforcing rubber layer 24, and a second reinforcing rubber layer 26. The first reinforcing rubber layer 24 is formed by arranging a plurality of strip-shaped reinforcing layer structural bodies 36 adjacently to each other in a width direction, and connecting widthwise end vicinal portions to each other. Thus to form the rubber dam, connection of the reinforcing layer structural bodies 36 to each other in a lengthwise direction is dispensed with, and therefore it is producible in a short time, which leads to improved productivity of the rubber dam. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a flexible membrane weir that is installed at the bottom of a water and used as a river weir, sluice, tide barrier weir, tsunami weir, ship gate, harbor cut-off gate, and the like, and a method for manufacturing this flexible membrane weir It is about.

  As a weir such as a river, there is a flexible membrane weir (so-called rubber weir) that can stand up and down by supplying and discharging water and air as required (for example, Patent Document 1). The flexible membrane weir may be required to be large depending on the width of the river and the height of the weir. For this reason, for example, as shown in Patent Document 2, when manufacturing a flexible membrane weir, a plurality of flexible membrane weir parts divided in the circumferential direction or the transverse direction of the flexible membrane weir There is known a method of bonding together by bonding.

  However, in the structure and manufacturing method of the flexible membrane weir described in Patent Document 2, an unvulcanized rubber sheet is further bonded to the vulcanized flexible membrane weir portion (rubber sheet) for bonding. Therefore, it takes time to complete the process and there is room for improvement in productivity.

JP-A-60-219313 JP 58-28362 A

  In view of the above facts, an object of the present invention is to obtain a flexible membrane weir that can be produced with higher productivity than before and a method for producing the flexible membrane weir.

  According to the first aspect of the present invention, there is provided a flexible membrane weir having a bag-like flexible membrane that stands up when a fluid is supplied to the inside thereof and falls down when the fluid inside is discharged. A flexible layer formed of a strip-shaped reinforcing layer structure, and a plurality of the reinforcing layer structures arranged only in a width direction perpendicular to the longitudinal direction and joined to each other; and the reinforcement And an outer skin layer disposed on the outer side in the thickness direction of the layer.

  In the present invention, the flexible film is formed by a reinforcing layer structure formed in a strip shape, and the plurality of reinforcing layer structures are arranged only in the width direction orthogonal to the longitudinal direction and joined to each other. The reinforcement layer is configured with In other words, the length in the longitudinal direction of the reinforcing layer structure has a length sufficient to cover the area where the reinforcing layer is required with a single piece in a state where the flexible membrane weir is formed. ing. And an outer skin layer is arrange | positioned on the thickness direction outer side of a reinforcement layer.

  In this way, since it is not necessary to join the reinforcing layer structure in the longitudinal direction, it can be manufactured in a short time compared to the flexible membrane weir having a structure in which the reinforcing layer structure is joined in the longitudinal direction. It is also possible to increase the nature.

  In addition, since the reinforcement layer structure is not joined to the longitudinal direction, the strength in the longitudinal direction (particularly, the strength when tension is applied) is increased. Even the flexible membrane weir is excellent in strength in the longitudinal direction of the reinforcing layer.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the reinforcing layer constituting bodies are joined to each other in the vicinity of the end in the width direction.

  That is, the reinforcing layer constituting body may be joined so as to overlap each other even in a portion other than the vicinity of the end in the width direction. In this case, the overlapping portion increases and waste occurs. As described in claim 2, if the reinforcing layer structures are joined to each other in the vicinity of the edges in the width direction, useless overlapping portions can be eliminated.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the reinforcing layer structure has a reinforcing cord arranged so as to extend along the longitudinal direction. .

  In this way, the strength of the reinforcing layer structure can be increased with a simple structure in which the reinforcing cord is simply disposed. The strength of the reinforcing layer joined with the reinforcing layer structure can also be increased. Moreover, since the reinforcing cords are arranged so as to extend along the longitudinal direction of the reinforcing layer structure, it is possible to effectively increase the strength in the longitudinal direction of the reinforcing layer structure.

  The term “along the longitudinal direction” as used herein includes, of course, a configuration in which each extending direction of the reinforcing cord is arranged so as to completely coincide with the longitudinal direction of the reinforcing layer constituting body. Further, the extending direction of each reinforcing cord has a component in the longitudinal direction of the reinforcing layer constituting body (the reinforcing cord is inclined at an angle other than 90 degrees with respect to the longitudinal direction of the reinforcing layer constituting body). Including.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the reinforcing cord is continuous from one end to the other end in the longitudinal direction of the reinforcing layer structure. It is characterized by being.

  In this way, the reinforcing cord is continuous from one end to the other end in the longitudinal direction of the reinforcing layer structure, whereby the reinforcing cord has no seam in the longitudinal direction of the reinforcing layer structure. For this reason, it becomes possible to raise intensity | strength more.

  The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the reinforcing layer is laminated in the thickness direction.

  Thus, a higher intensity | strength can be obtained by laminating | stacking a reinforcement layer in the thickness direction.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the reinforcing cords are laminated such that the reinforcing cords cross each other when viewed in the laminating direction of the reinforcing layers.

  In this way, the reinforcing cords cross each other when viewed in the lamination direction of the reinforcing layer, so that the reinforcing direction of the reinforcing layer (the direction in which the strength is increased) also intersects, and the overall direction dependency of the strength is reduced. it can.

  The invention according to claim 7 is the method for manufacturing the flexible membrane weir according to any one of claims 1 to 6, wherein the reinforcing layer constituents are arranged in the width direction to each other. It has the joining process which joins and comprises a reinforcement layer, and the outer skin layer sticking process which sticks an outer skin layer on the thickness direction outer side of the said reinforcement layer joined by the said joining process, It is characterized by the above-mentioned.

  In the present invention, in the joining step, a plurality of reinforcing layer constituents formed in a strip shape are arranged only in the width direction orthogonal to the longitudinal direction and joined to each other to constitute a reinforcing layer. And in a skin layer sticking process, a skin layer is arrange | positioned on the thickness direction outer side of a reinforcement layer.

  Thus, since the reinforcing layer structure is not joined in the longitudinal direction, it can be manufactured in a short time compared to the manufacturing method of the flexible membrane weir that joins the reinforcing layer structure in the longitudinal direction. It can also be increased.

  In the flexible membrane weir manufactured according to the present invention, since the reinforcing layer constituting body is not joined in the longitudinal direction, the strength in the longitudinal direction (particularly the strength when tension is applied) is increased. As the flexible membrane weir, one having excellent strength in the longitudinal direction of the reinforcing layer constituting body is obtained.

  Since this invention was set as the said structure, the flexible membrane weir which can be produced with productivity higher than before, and the manufacturing method of this flexible membrane weir are obtained.

  The flexible membrane weir according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partial perspective cross-sectional view of a standing state of a flexible membrane weir arranged to cross a river. 2 and 3 are partial cross-sectional views of the flexible membrane. In particular, FIG. 3 is a cross-sectional view of the flexible membrane weir cut along the flow direction of the river, and shows the standing and lying state of the flexible membrane weir. In addition, the arrow C in a figure shows the flow direction of a river, and the flow direction of a river has shown the direction which flows from the upstream of a river to the downstream.

  As shown in FIG. 1, a river bed 14 of a river 12 where a flexible membrane weir (in this embodiment, a rubber weir 10) is constructed has a flat surface and slopes 16 (one side) located on both sides of the river 12. The slope of () is not shown) is inclined at a certain angle with respect to the river bed 14. In the present embodiment, the river bed 14 and the slope 16 are made of concrete or the like. The rubber weir 10 extends in a straight line from one slope 16 to the other slope 16 and crosses the river 12.

  The rubber weir 10 has a rubber sheet 20 formed in a bag shape as a whole by binding at a bag binding portion 20A. The rubber weir 10 can adjust the flow rate of the river by raising the rubber sheet 20 by supplying fluid (for example, air, water, etc.) into the rubber sheet 20. Further, by discharging the fluid inside the rubber sheet 20, the rubber sheet 20 falls down and the river flow is released. In FIG. 3, the standing rubber weir 10 is indicated by a solid line, and the lying rubber weir 10 is indicated by a two-dot chain line.

  Anchor bolts 30 planted at predetermined intervals on the riverbed 14 and the slope 16 penetrate the bag binding portion 20A. Further, the washer and the nut 34 are fastened to the anchor bolt 30 in a state where the bag binding portion 20 </ b> A is pressed by the presser fitting 32, and the rubber weir 10 is fixed to the river bed 14 and the slope 16. Note that, by fastening the anchor bolt 30 and the nut 34, the bag binding portion 20 </ b> A is strongly sandwiched between the riverbed 14 and the slope 16 and the presser fitting 32, so that the inside of the rubber sheet 20 is sealed.

  The rubber sheet 20 includes an outer rubber layer 22 disposed on the outermost layer, a first reinforcing rubber layer 24 disposed on the inner side of the outer rubber layer 22, and a second reinforcing member disposed on the inner side of the first reinforcing rubber layer 24. And a rubber layer 26. In addition, in the rubber sheet 20 of this embodiment, it is set as the structure by which the 1st reinforcement rubber layer 24 and the 2nd reinforcement rubber layer 26 are each arrange | positioned, However It is not necessary to be limited to this structure, Each is multiple layers. It may be arranged.

  As shown also in FIG. 4, the 1st reinforcement rubber layer 24 is comprised by the some reinforcement layer structure 36 formed in strip shape (rectangular shape by planar view). The reinforcing layer constituting body 36 is formed by embedding a plurality of first reinforcing cords 24A continuously extending from one end to the other end in the longitudinal direction in a covering rubber. Then, the plurality of reinforcing layer constituting bodies 36 are arranged adjacent to each other in the direction (width direction) orthogonal to the longitudinal direction, and the portions in the vicinity of the edges in the width direction are joined to each other, so that a first size having a predetermined size is obtained. One reinforcing rubber layer 24 is formed. In each drawing, a linear joint portion (seam) is indicated by a symbol JL.

  Similarly, the 2nd reinforcement rubber layer 26 is also comprised by the reinforcement layer structure 38 formed in strip shape. The internal structure of the reinforcing layer constituting body 38 constituting the second reinforcing rubber layer 26 is the same as the reinforcing layer constituting body 36 constituting the first reinforcing rubber layer 24, but is longer (long in the longitudinal direction). It is made into a shape. Then, the plurality of reinforcing layer constituting bodies 38 are arranged adjacent to each other in the direction (width direction) orthogonal to the longitudinal direction, and the portions in the vicinity of the edges in the width direction are joined to each other, thereby having a second size having a predetermined size. A reinforcing rubber layer 26 is formed.

  Here, as shown in FIG. 1, the first reinforcing rubber layer 24 has a shape for constituting the rubber weir 10 by binding the bag at each longitudinal end of the reinforcing layer constituting body 36. It has become. In other words, each of the reinforcing layer constituting bodies 36 has a length in the longitudinal direction sufficient to form a bag binding shape in this way. Therefore, although the plurality of reinforcing layer constituting bodies 36 are joined to each other in the width direction, the first reinforcing rubber layer 24 can be constituted without joining in the longitudinal direction.

  On the other hand, the reinforcing layer constituting body 38 constituting the second reinforcing rubber layer 26 has a length in the longitudinal direction sufficient for the respective longitudinal end portions to reach the slopes 16 on both sides of the river 12. Yes. Therefore, although the plurality of reinforcing layer constituting bodies 38 are joined to each other in the width direction, the second reinforcing rubber layer 26 can be constituted without joining in the longitudinal direction.

  As shown in FIG.2 and FIG.4, the 1st reinforcement rubber layer 24 and the 2nd reinforcement rubber layer 26 are laminated | stacked in the direction where a mutual reinforcement cord orthogonally crosses. In particular, in this embodiment, as can be seen from FIG. 1, the extending direction of the first reinforcing cord 24A of the first reinforcing rubber layer 24 is made to coincide with the river flow direction. Thereby, even when a large tension acts in the flow direction due to, for example, a river flow, sufficient strength can be obtained. In the present embodiment, the extending direction of the second reinforcing cord 26A of the second reinforcing rubber layer 26 is made to coincide with the width direction of the river. Thereby, sufficient strength can be obtained even when a large tension acts in the width direction of the river.

  The first reinforcing cord 24A and the second reinforcing cord 26A are not particularly limited as long as the cord diameter and the cord material are sufficiently strong to withstand the water pressure received from the river and the internal pressure of the rubber sheet 20. As the material of the cord, it is preferable to use a monofilament or multifilament of metal and fiber. Specific examples thereof include steel, nylon, and kevlar.

  The outer rubber layer 22 may be subjected to a large impact by driftwood or rolling stones from the upstream side of the river, and may be exposed to sunlight for a long time. Therefore, in consideration of these, a rubber material having high durability is used.

  Next, the manufacturing method of the rubber sheet 20 used for the rubber weir 10 of this embodiment is demonstrated according to FIG.5 and FIG.6.

  First, the reinforcing layer structure 36 is manufactured. A plurality of first reinforcing cords 24A continuously extending in a certain direction are arranged in parallel and covered with unvulcanized rubber. The reinforcing layer structure 36 and the reinforcing layer structure 38 only differ in shape, and the internal structure is the same. Therefore, the reinforcing layer structure 38 can also be manufactured by substantially the same manufacturing method as the reinforcing layer structure 36 (only the cut dimensions in the final process are different). These reinforcing layer constituting bodies 36 and 38 are wound in a roll shape along the extending direction of the respective reinforcing cords to constitute rolls 40 and 42 (see FIG. 5).

  Next, as shown to FIG. 5 (A), the some reinforcement layer structure 38 is unwound from the roll 42 so that these may adjoin in the width direction. And the edge part vicinity part of the width direction of the reinforcement layer structure 38 is joined together, or it overlaps | superposes slightly and joins. At this time, it is preferable that adjacent reinforcing layer structures 38 do not overlap each other. The plurality of bonded reinforcing layer structures 38 are integrally wound to form a roll 44.

  Next, as shown in FIG. 5 (B), the reinforcing layer constituting body 38 is unwound from the roll 44 so as to be partially planar. The reinforcing layer constituting body 36 is unwound from the roll 40 and disposed on the flat portion. The direction of the reinforcing layer structure 36 is a direction in which the longitudinal directions of the reinforcing layer structure 38 are orthogonal to each other. Moreover, the some reinforcement layer structure 36 is unwound from the roll 40 so that it may adjoin by the width direction. And the edge part vicinity part of the width direction of the reinforcement layer structure 36 is joined together, or it overlap | superposes slightly and joins (joining process). At this time, similarly to the reinforcing layer structure 38, it is preferable that adjacent reinforcing layer structures 38 do not overlap each other. In this manner, the roll 46 is configured by being integrally wound in a state where the reinforcing layer constituting body 38 and the reinforcing layer constituting body 36 are laminated.

  Next, as shown in FIG. 5C, the laminated reinforcing layer constituting bodies 36 and 38 are unwound from the roll 40, and the outer rubber layer 22 is bonded (outer layer bonding step). In FIG. 5C, the outer rubber layer 22 is attached only to the upper surface, but actually, it is also attached to the lower surface. At this stage, the outer rubber layer 22 is also unvulcanized like the reinforcing layer constituting bodies 36 and 38.

  Thus, a laminate of the unvulcanized reinforcing layer structure 36 (first reinforcing rubber layer), the unvulcanized reinforcing layer structure 38 (second reinforcing rubber layer), and the unvulcanized outer rubber layer 22, that is, An unvulcanized rubber sheet 20M is manufactured. In addition, in this embodiment, although the lamination | stacking procedure as mentioned above was shown, in addition, for example, an unvulcanized skin rubber layer, an unvulcanized reinforcement layer structure 36, an unvulcanized reinforcement layer structure They may be stacked in the order of 38. Also, these manufacturing procedures need not be limited to the above-described procedures.

  Then, as shown in FIG. 6, after the unvulcanized rubber sheet 20 </ b> M is wound around the feed roll 52, the feed roll 52 is set in the vulcanizer 50. The feed roll 52 sequentially feeds the unvulcanized rubber sheet 20M through the press portion 56A of the vulcanizing press 56 to the take-up roll 54 side (so-called conveyance direction (arrow X direction)). The take-up roll 54 sequentially takes up the rubber sheets 20 vulcanized by the vulcanizing press 56. In the vulcanizing press machine 56, the unvulcanized rubber sheet 20M is vulcanized. The high pressure press by the vulcanizing press machine 56 increases the adhesive strength between the rubber and the rubber of the rubber sheet 20M and the cord and the rubber, so that a stable quality can be maintained against aging and sufficient strength can be secured. become able to. The vulcanizing press 56 vulcanizes the unvulcanized rubber sheet 20M by a predetermined length and vulcanizes the whole. Further, the unvulcanized rubber sheet 20M is set in the vulcanizer so that the conveying direction of the unvulcanized rubber sheet 20M is the same as the longitudinal direction of the unvulcanized reinforcing layer constituting body 38.

  Next, the effect of the rubber weir 10 of this embodiment is demonstrated.

  As can be seen from FIG. 2 and FIG. 4, the rubber weir 10 includes a plurality of reinforcing layer constituting bodies 36 formed in a strip shape arranged only in the width direction of the reinforcing layer constituting bodies 36, and the first reinforcing rubber. Layer 24 is formed. Since it is not necessary to join the reinforcing layer constituting body 36 in the longitudinal direction, it can be manufactured in a short time and productivity can be improved as compared with the case where the reinforcing rubber layer is constituted by joining in the longitudinal direction. .

  In the rubber weir 10, the second reinforcing rubber layer 26 is also configured by arranging the reinforcing layer constituting bodies 38 formed in a strip shape only in the width direction of the reinforcing layer constituting bodies 38. Therefore, it can be manufactured in a short time and productivity can be improved.

  Moreover, in the present embodiment, the first reinforcement cord 24A and the second reinforcement cord 26A are orthogonal to each other. Although the crossing direction of the first reinforcing cord 24A and the second reinforcing cord 26A is not particularly limited, the rubber weir 10 as a whole can be efficiently reinforced by being orthogonal to each other in this way.

  In particular, the first reinforcing cord 24 </ b> A is continuous in the first reinforcing rubber layer 24. That is, when viewed along the extending direction of the first reinforcing cord 24A, there is no seam of the first reinforcing cord 24A in the first reinforcing rubber layer 24 in this direction. Therefore, it is superior in strength compared to a rubber sheet in which the reinforcing cord is discontinuous, that is, a rubber sheet having a seam in the reinforcing cord.

  The second reinforcing cord 26A is also continuous in the second reinforcing rubber layer 26, and no seam exists in the second reinforcing rubber layer 26 in the extending direction of the second reinforcing cord 26A. Excellent strength compared to rubber sheets.

  In addition, the arrangement direction of the rubber weir 10 in this embodiment is a direction in which the extending direction of the first reinforcing cord 24A coincides with the river flow direction, as can be seen from FIG. In general, since the direction of the main stress acting on the rubber weir 10 is the flow direction of the river from upstream to downstream, the rubber weir 10 can be efficiently reinforced by continuing the first reinforcing cord 24A in the flow direction of the river. . In the present embodiment, the extending direction of the second reinforcing cord 26A coincides with the river width direction, so that the rubber weir 10 is excellent in strength also in the river width direction.

  Of course, the extending directions of the first reinforcing cord 24A and the second reinforcing cord 26A are not limited to those extending in the longitudinal direction of the reinforcing layer constituting bodies 36 and 38, respectively, and are necessary for the rubber weir 10. It only has to satisfy the strength. For example, both the first reinforcing cord 24A and the second reinforcing cord 26A are inclined at an inclination angle other than 90 degrees with respect to the longitudinal direction of the reinforcing layer constituting bodies 36 and 38, and are formed in a mesh shape (a rhombus shape) as a whole. It may be. In this case, both the first reinforcement cord 24A and the second reinforcement cord 26A are inclined with respect to the river flow direction and the river width direction even in the state of being installed in the river.

  Regardless of the configuration, the first reinforcing cord 24A and the second reinforcing cord 26A as a whole are viewed in the thickness direction of the rubber sheet 20 (the stacking direction of the first reinforcing rubber layer 24 and the second reinforcing rubber layer 26). Crossed. Therefore, compared with the structure which does not cross | intersect, the direction dependency of intensity | strength can be decreased and the intensity | strength as a whole can be raised.

  Furthermore, in the present embodiment, the first reinforcing rubber layer 24 is disposed outside the second reinforcing rubber layer 26. For this reason, the bending radius of the bent portion of the first reinforcing cord 24A is larger than that in which the first reinforcing rubber layer 24 is disposed inside the second reinforcing rubber layer 26, and the first reinforcing cord 24A is folded. Song fatigue is relieved. For example, when the rubber weir 10 falls down, the first reinforcing cord 24A is bent, but bending fatigue in this case can be alleviated.

  When the unvulcanized rubber sheet 20M is vulcanized, it may be vulcanized in a folded state. In the present embodiment, the first reinforcing rubber layer 24 is disposed outside the second reinforcing rubber layer 26, and the bending radius of the first reinforcing cord 24A is large. The difference in length between the lengths of the cords 24A is alleviated, and the rubber weir 10 having higher strength can be obtained.

  Further, in the above description, when joining the reinforcing layer constituting body 36, an example is given in which the adjacent reinforcing layer constituting bodies 36 are joined together or slightly overlapped with the vicinity of the edge in the width direction. This is preferable because the reinforcing layer constituting body 36 can be used without waste and unnecessary thick portions are not present in the first reinforcing rubber layer 24 after joining. However, the joining strength may be further increased by joining the regions wider than the vicinity of the width direction end side of the reinforcing layer constituting body 36 so as to partially overlap each other. The same applies to the reinforcing layer structure 38.

  Furthermore, in the above description, the rubber weir 10 using the rubber sheet 20 having a structure in which the first reinforcing rubber layer 24 and the second reinforcing rubber layer 26 are laminated is described. However, the rubber weir 10 is composed of only one reinforcing rubber layer 24. A rubber weir can also be configured using a rubber sheet. When the reinforcing rubber layer is laminated as in the above embodiment, higher strength can be obtained as compared with the structure of only one reinforcing rubber layer.

It is sectional drawing which fractures | ruptures and shows the standing state of the rubber weir of 1st Embodiment of this invention partially. It is sectional drawing which shows partially the rubber sheet which concerns on 1st Embodiment of this invention in the vicinity of the folding | turning part. It is sectional drawing which cut | disconnected the rubber weir of 1st Embodiment of this invention along the flow direction of the river in the standing and lying state. It is sectional drawing which shows partially the state before the rubber sheet which concerns on 1st Embodiment of this invention in return. It is explanatory drawing which shows the manufacturing process of the rubber sheet which concerns on 1st Embodiment of this invention to (A)-(C) in order. It is a perspective view which shows typically the manufacturing method of the rubber weir of 1st Embodiment of this invention.

Explanation of symbols

10 Rubber weir (flexible membrane weir)
12 River 14 Riverbed 16 Slope 20 Rubber sheet 20M Rubber sheet 20A Bag binding part 22 Outer rubber layer (outer layer)
24 First reinforcing rubber layer (reinforcing layer)
24A 1st reinforcement cord 26 2nd reinforcement rubber layer (reinforcement layer)
26A 2nd reinforcement cord 36 Reinforcement layer structure 38 Reinforcement layer structure

Claims (7)

A flexible membrane weir having a bag-like flexible membrane that stands up by supplying fluid therein and falls down by discharging fluid inside;
The flexible film is formed of a strip-shaped reinforcing layer structure,
A plurality of the reinforcing layer constituting bodies arranged only in the width direction orthogonal to the longitudinal direction and joined to each other;
An outer skin layer disposed outside the reinforcing layer in the thickness direction;
A flexible membrane weir characterized by comprising:   The flexible membrane weir according to claim 1, wherein the reinforcing layer constituting bodies are joined to each other in the vicinity of the edge in the width direction.   The flexible membrane weir according to claim 1 or 2, wherein the reinforcing layer structure includes a reinforcing cord arranged to extend along the longitudinal direction.   The flexible membrane weir according to claim 3, wherein the reinforcing cord is continuous from one end to the other end in the longitudinal direction of the reinforcing layer constituting body.   The flexible membrane weir according to any one of claims 1 to 4, wherein the reinforcing layer is laminated in a thickness direction.   6. The flexible membrane weir according to claim 5, wherein the reinforcing cords are laminated such that the reinforcing cords cross each other when viewed in the lamination direction of the reinforcing layers. It is a manufacturing method of the flexible membrane dam according to any one of claims 1 to 6,
A joining step in which the reinforcing layer structure is arranged in the width direction and joined together to form a reinforcing layer;
An outer skin layer attaching step for attaching an outer skin layer to the outer side in the thickness direction of the reinforcing layer joined by the joining step;
A method for producing a flexible membrane weir, comprising:

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