KR820002183B1 - Collapsibile rubber dam - Google Patents

Abstract

A flexible body in the form of a strip of elastomeric material, has a slit through its thickness reaching from one edge to a predetermined point across its width, and extending lengthways through the strip. The strip can be anchored to a river bed, bank or beach by fastening which close the split so that the strip can be inflated by injecting fluid to form a dam. The elastomeric material may be reinforced by woven fabric cut on the bias, and one or more auxiliary chambers of smaller dia. than the cavity formed in the strip may be provided inside the inflatable chamber and run along its length.

Description

Folding Rubber Dam

1 is a cross-sectional view of a rubber dam composed of rubber sheets in an expanded state.

2 is a cross-sectional view of the rubber dam of FIG. 1 under a relaxed state.

3 is a cutaway perspective view of an embodiment of a flexible plate body having a segment open in accordance with the present invention.

4 and 5 are cross-sectional and perspective views of an embodiment of fixing the flexible plate of FIG. 3 to the riverbed and the river bank, respectively.

6 is an exploded perspective view of an embodiment of an inlet hole for supplying fluid to an expandable chamber of a flexible plate body.

FIG. 7 is a cross sectional view of the expanded state of the flexible plate of FIG. 4 as a collapsible rubber dam. FIG.

8 is a cross-sectional view of an embodiment of a flexible plate secured to a bed in a relaxed state.

9, 11 and 13 are cutaway perspective views of various embodiments of a flexible plate body having a hollow partition in a relaxed state, respectively.

10, 12 and 14 are cutaway perspective views of the flexible plate shown in FIGS. 9, 11 and 13, respectively, in an expanded state.

FIG. 15 is a cutaway perspective view of an example of a relaxed state in which the flexible plate body of FIG. 13 is fixed to a riverbed and a river bank.

Fig. 16A is a cutaway perspective view of an embodiment of a fluid supply inlet hole formed on a flexible plate body and connected to a pipe embedded in a lower part.

FIG. 16B is a cross sectional view taken along X-ray of FIG. 16A; FIG.

Fig. 17 is a cutaway perspective view of another embodiment of a flexible plate body having a plurality of inlet holes in its plate-shaped joint.

18 to 21 are partial cross-sectional views of various embodiments for fixing the angular flexible plate to the bottom.

Fig. 22 is a perspective view of an embodiment of a flexible plate under an expanded state fixed on the bed.

23 and 25 are cross-sectional views of the flexible plate body of FIGS. 11 and 13 respectively fixed to the lower bed in the expanded state.

24 is a partially enlarged cross-sectional view of another embodiment of the flexible plate of FIG.

FIG. 26 is a cross sectional view of an embodiment under an expanded state of a collapsible rubber dam consisting of two mutually timed and flexible plate bodies anchored to the bottom.

Fig. 27 is a perspective view of an embodiment of a folded rubber dam in an expanded state consisting of two flexible plates whose side ends are connected to each other.

FIG. 28 is a cross sectional view of an embodiment of a flexible plate under a relaxed state with both ends secured to a bed;

29A and 29B are cross sectional views of the flexible plate of FIG. 28 under an expanded state during use in forward and backward flows, respectively.

30 is a cross-sectional view of an embodiment of a foldable rubber dam produced by associating the flexible plate of FIG. 9 with the flexible plate of FIG.

Figure 31 is a cross sectional view of an embodiment of a flexible plate according to the present invention.

32A and 32B are cross-sectional views of the flexible plate of FIG. 31 under an expanded state during use in forward and backward flows, respectively.

33 and 34 are schematic perspective views in an expanded state of a flexible plate fixed to a river bed and a river bank by fluid supply, respectively.

35 is a perspective view including a partial cross-sectional view of a flexible plate reinforced with a bis cut weaue fabrlc.

36 is a cutaway perspective view illustrating the expanded state of the flexible plate of FIG.

FIG. 37 is a schematic view from a downstream side illustrating the flexible plate body of FIG. 35 secured to a riverbed and a river bank by fluid supply; FIG.

38 is a schematic view of an example of measuring the degree of shrinkage of a flexible plate reinforced with a knitted fabric.

39 and 40 are schematic perspective views of an example of a flexible plate fixed to a river bed and a river embankment, respectively, filled with a flexible sheet at both ends near the river bed.

41A-41C are cross-sectional views of an embodiment of a flexible plate body having a primary expandable chamber and an auxiliary expandable chamber in an expanded state and a relaxed state, respectively.

FIG. 42 is a perspective view of an embodiment of a piping system for supplying or discharging fluid into the flexible plate of FIG. 41. FIG.

43 and 43B are cross-sectional views of a flexible plate having a primary expandable chamber and a secondary expandable chamber filled with a flow material under expanded and relaxed states, respectively.

44A-44B are cross-sectional views of an embodiment of a flexible plate body having a hollow segment with a plurality of grooves, respectively, in an expanded and relaxed state.

45 is a cross sectional view of another embodiment of a flexible plate.

46 is a cross sectional view of an embodiment of a flexible plate with an open divider and secured to a lower bed.

47A and 47B are cross-sectional views of an alternative embodiment of the flexible plate body with the open end of FIG. 1 fixed to the bottom, respectively.

48 is a cross sectional view of an embodiment of a flexible plate with a dividing wall in an expanded state.

FIG. 49 is a cutaway perspective view of an embodiment of the piping system for flexible plates of FIG. 48; FIG.

50 is a cross sectional view along the Y-Y line of FIG.

51-53 are cross-sectional views of modified embodiments of flexible plates having partition walls, respectively, in an expanded state.

54A and 54B are cross sectional and perspective views, respectively, of an embodiment of a flexible plate with multiple bumps and grooves on its face under relaxed and expanded conditions, respectively.

The present invention relates to the improvement of prefabricated rubber dams used for irrigation water intake dams, storm surge protectors, seawater fence barrier dams, etc.

Background Art Conventionally, steel automatic conducting fences have been well known as fences for adjusting the water level of irrigation intakes or seawater dams in estuaries. However, such a steel fence is operated by a hydraulic cylinder or the like, it is very difficult to operate the guard, it was impossible to install on a weak foundation.

Recently, a so-called prefabricated rubber dam, which is operated by direct supply of fluids such as air and water, and composed of rubber sheets that are easy to install or maintain, has been developed and used. Such a rubber dam D is usually manufactured by molding a rubber sheet material into a closed bag shape in the field as shown in FIG. 1 and FIG. In this case, however, the thick rubber sheet cannot be used from the viewpoint of workability, so the rubber dam causes damage by the influence of driftwood and rolling rocks.

And, as shown in FIG. 2, when the rubber dam collapses due to the relaxation of the fluid, the fractional downstream portion shown by the mark a is always folded, so that cracks or other defects are likely to occur at that portion, thereby deteriorating durability. It is therefore an object of the present invention to remedy the shortcomings of the corresponding rubber dams described above and to maintain their advantages.

According to the present invention, the collapsible rubber dam is made of a resilient rubber and is composed of a flexible plate having at least one divided portion at a predetermined position along a thickness direction and a longitudinal direction, wherein the divided body is provided with the divided portion during fluid supply. It is hermetically fixed to river banks and riverbeds with attachment members for use as expandable chambers.

In an embodiment of the present invention, the division is a hollow division. And the expandable chamber was also reinforced with knit fabric.

In a second embodiment of the present invention, an auxiliary expandable chamber having a diameter smaller than the diameter of the expandable chamber is provided along the longitudinal direction in the expandable chamber. The auxiliary expandable chamber contains a flowable substance that solidifies at room temperature.

Alternatively one or more grooves are formed in the inner wall of the inflatable chamber.

In the third embodiment of the present invention, a rigid coupling member is tightly inserted between the divided portion and the quantum end portion formed in the flexible plate body in one or more longitudinal directions.

In a fourth embodiment of the present invention, one or more separation walls are arranged in association with the inflatable chamber to divide the chamber into one or more chamber portions.

In the sixth embodiment of the present invention, one or more portions of the outer surface of the flexible plate body are roughened along the longitudinal direction.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In Fig. 3, reference numeral 1 denotes a flexible rubber plate body made of elastic rubber and having an open divided part 2, and is formed at a predetermined position in the longitudinal direction and the thickness direction. The plate is reinforced with a canvas if necessary.

The manufacture of the flexible plate 1 is performed as follows.

For example, two raw rubber sheets are piled up and placed on a thermal face plate of a molding press. Then, an anti-stick material is inserted between the raw rubber sheets along the longitudinal direction of the rubber sheet so that only the end of the sheet remains in contact. Thereafter, the raw and unassembled assembly is compressed under the vulcanization temperature to produce a flexible plate 1 having an open partition 2. In this case, the canvas or knitted fabric may be appropriately embedded in the raw rubber sheet to obtain a desired reinforcement layer.

Since the plate 1 thus manufactured can be manufactured according to a predetermined length, it is very suitable as a foldable rubber dam of rivers, streams, channels and the like having respective widths. And since a board body is manufactured by the press molding of a rubber sheet, the thickness of a board body can be selected freely.

The flexible plate 1 is fixed to riverbeds and river banks as shown in FIGS. 4 and 5.

First, the open end of the flexible plate body 1 is arranged towards the upstream of the stream (in this case, the direction of the flow is shown by arrow A). The holes drilled in the open ends (not shown) respectively fit into the foundation bolts 5 previously embedded in the lower bed 4. Thereafter, the open side end of the flexible plate body 1 is hermetically fixed to the lower bed 4 via the press plate 6 which is extended and opened with the nut 7 as shown in FIG.

On the other hand, the open end of the flexible plate (1) is cut inclined at an angle given toward the downstream of the river and the base bolt (5), the pressing plate (6) and the nut (7) to the river bank with airtightness as shown in FIG. Fix it.

An inlet opening or an expandable main chamber 9 for supplying fluid to the divider 2 after fixing to the riverbed and the river bank is arranged at a suitable position of the flexible plate 1. For example, such an inlet opening is composed of a flanged nipple 10 and a set of pressing members 11 each having a semi-circular curved portion as shown in FIG. In this case, the flanged nipple 10 is inserted at an appropriate position in the main expandable chamber and is hermetically fixed to both sides by the pressing member by bolts and nuts. In order to fix more tightly, as shown in FIG. 6, the flexible packing 13, which is inclined gradually from the top to the bottom in the vertical direction perpendicular to the nipple center axis, and symmetrical with respect to the center axis, is flanged nipple 10 It can also be provided in the circumference. And the position of the inlet opening to be arrange | positioned in a flexible board body is preferable the edge part of the board body fixed to a river bank.

FIG. 7 shows the expanded state of the flexible plate 1 in which fluid such as air water is supplied to the division 2 forming the main expandable chamber 9 to form a rubber dam.

In this case, the rubber dam hardly suffers from driftwood or the like caused by the thickness of the thick plate forming the rubber dam. Then, the joint 12 of the plate body acts as a throating, so that the vibration of the rubber dam and the fatigue phenomenon accompanying it do not occur, resulting in the development of a stable dam effect.

On the other hand, in the relaxed state as shown in FIG. 4, the flexible plate body is flattened around the joint 12, so that the rubber dam body 1 does not generate special stress on the lower bed 4, and is disposed flat. As described above, the rubber dam main body does not exhibit cracking due to the stress generated in the rubber dam of the use made of the rubber sheet material. In addition, since the rubber dam body is thick, damage caused by rolling rocks is reliably prevented in a relaxed state.

FIG. 8 shows that the upper free end of the flexible plate 1 'with the divider 2' protrudes considerably more than its lower free end and both ends are fixed to the lower bed 4 in the same manner as in FIGS. Another embodiment is shown.

The present invention will now be described with reference to the case where one or more divided portions formed in the flexible plate body make a hollow portion by closing between the open free ends thereof.

FIG. 9 shows in FIG. 11 and FIG. 13, 20, 30, and 40, respectively, are flexible rubber bodies, which are reinforced with canvas 3 or the like, even though they are made of elastic rubber, respectively.

The flexible plate body 20 of FIG. 9 has the hollow part 20a which comprises an expandable chamber, and the plate-shaped joint part 20b extended along the longitudinal direction of the plate body.

On the other hand, each of the flexible plate body 30 or 40 in FIGS. 11 and 13 has two hollow portions 30a and 30a 'or 40a and 40'a, unlike in the case of FIG. That is, it has one open division part 30'a or 40'a and plate-shaped junction part 30b or 40b.

These flexible plate bodies 20, 30 and 40 are manufactured by the press molding described in the case of FIG. Knitted fabrics are also used for shape reinforcement.

The confidentiality of this flexible plate is achieved as follows. For example, each open end of the flexible plate 20 is previously bonded by vulcanization during plate production. However, since the lower body or the like employing the flexible plate as a folding rubber dam usually has a different width, it is desired to cut the flexible plate to a length corresponding to the river width. In this case, after vulcanization, each cut end of the flexible plate is inserted between a set of push members, and is tightened by a bolt and nut, or the cut end of the flexible plate 40 is attached to the bolt and nut as shown in FIG. By the pressing member 6 is directly fixed to the river bank (8).

In this way, a flexible plate with a length corresponding to the width of the river to be installed is simply and conveniently manufactured as a highly air-tight folding rubber dam, compared with the case of forming rubber sheet material in the form of a closed bag in the field. The work efficiency is much improved.

Although the embodiment of FIG. 15 is hermetically closed at the cut end of FIG. 13 and the flexible plate 40, similar results are also achieved in FIGS. 9 and 11.

The flanged nipple 10 and the pressing member 11 are provided at a given position of the flexible plate to form an inlet opening for the expandable chamber for supplying a fluid such as air or water to the expandable chamber of the flexible plate. Is placed.

Alternatively, the pipes 23 previously embedded in the lower bed 40 as shown in FIGS. 16A and 16B are directly connected to the openings 21 formed on the flexible plate body 20 'installed on the lower bed via the flange 22. Connected.

As shown in FIG. 17, a plurality of inlet openings 24 for supplying fluid may be formed along the longitudinal direction at appropriate intervals in the plate-shaped joint portion 20 ″ b of the flexible plate body 20 ″.

Next, fixing the flexible plate on the bed is explained with reference to FIGS. 18 to 21.

18 to 21 only show the equation of fixing the flexible plate 20 shown in FIG. 9 to the lower bed 4.

In the embodiment of FIG. 18, the flexible plate 20 reinforced with the steel cord or the bead line embedded in the plate joint 20b is pressed to suppress the movement of the bead line 13 inside the plate joint 20b. The plate-shaped joint portion 20b of the flexible plate body 20 is squeezed along the longitudinal direction by the member 6 ', and the bottom plate is fixed by fixing the foundation bolt 5 and the nut 7 which are previously embedded in the lower bed 4. It is fixed to (4). In this case, the airtightness of the fixed part of the flexible plate can be improved by inserting a sealing agent or the like between the lower bed 4 and the plate-shaped joint 20b.

In the embodiment of FIG. 19, the flexible plate 20 is a kawaii plate 20 having a plurality of flutes on the outer surface of the plate-shaped connecting portion 20b along the longitudinal direction.

The plate-shaped joint 20b of the flexible plate body 20 uses a pressing member 6 'having a plurality of protrusions that fit into the longitudinal grooves 20'b through the foundation bolt 5 and the nut to lower the bed 4. Is fixed to.

The formation of the longitudinal grooves 20'b is expected to make the flexible plate body sufficiently resistant to hydraulic pressure by enabling an increase in the coefficient of friction at the fixing portion of the flexible plate body.

In the embodiment of FIG. 20, the flexible plate 20 is passed through the washer 27 through the washer 27 to the foundation bolt 5 and the nut 7 without using a special pressing member 6 'or 6 ". It is fixed to).

In this embodiment, the spring steel 28 is embedded longitudinally as a reinforcement in the plate-shaped joint 20b. And, to protect the nut 7, the curved protective metal member 27 'is welded on the washer 27 surface.

The embodiment of FIG. 21 differs from the embodiment of FIGS. 18 to 20 in which the foundation bolt 5, which is embedded in advance, is fixed with a flexible plate on the lower side. This is fixed in advance through the washer 27, the bolt 5 'and the nut 7 to the plate-shaped joint 20b of the flexible plate 20 reinforced with the steel, canvas or spring steel at suitable intervals. do.

The plate is temporarily placed on the bed in order to secure the flexible plate with the shaped steel to the bed, after which the steel is appropriately embedded in the bed in the usual manner. And this embedding is very good workability.

Although it is often required to transport the flexible plate with the length corresponding to the width of the river to the work site, the flexible plate 20, in particular the plate-shaped joint 20b, is used for the bead wire, steel cord, canvas, Even if it is reinforced with spring steel or the like as shown in Figs. 18 to 21, it is preferable that the flexible plate is manufactured so as to contain the entire flexibility even in such a reinforcing layer.

The flexible plate is fixed on the bottom as described above.

Similarly, both ends of the flexible plate can be fixed to the river bank in appropriate manner without damaging the airtightness, respectively.

According to the present invention, the flexible plate body having an excellent airtightness and used as a folding rubber dam is fixed to the riverbed and the river bank differently from the conventional method of forming the rubber sheet material into a hermetic bag shape in the field. This independently promotes the airtightness of the dam body or the expandable chamber. Since only one side of the flexible plate (that is, the plate-shaped joint) is sufficient, the workability is improved compared to the fixing of the sheet material, and the reliability of the airtightness is very high.

FIG. 22 is an expanded state of the flexible plate of FIG. 9, and the flexible plate is secured with a degree of flexibility (not 0 ° to 90 °) by the foundation bolt 5 or the like, and the fluid is fixed to the expandable chamber 20a. By supplying, a folding rubber dam is formed.

The fluid to be supplied to the expandable chamber 20a is usually air, water, or the like. Folding rubber dams, however, are sometimes deployed in areas with power sources. In this case, it is also preferable to use the exhaust gas generated from the automobile as a fluid. Since the pressure of the exhaust gas is usually about 0.7 kg / m 2 pressure, it is possible to inflate the folding rubber dam to a height of about 7 m by supplying the exhaust gas.

Figures 23 and 25 show the expanded state of the flexible plate body with two expandable chambers as shown in Figures 11 and 13, respectively, after being anchored to the bottom.

In the embodiment of FIG. 23, the plate-shaped joint 30b of the flexible plate body 30 is connected to the foundation bolt 5 so that the connecting portion 30 "b between the expandable chamber 30a and 30'a faces the upstream of the stream. And the nut 7 and the like are fixed to the lower bed 4, and the connection portion 30 ″ b is fixed to the lower bed 4 by the chain 31 and the like, so that the safety of the flexible plate in the expanded state is significantly improved.

In fixing the connection part 30 "b to the lower phase 4, the iron plate 33 etc. is embedded in the projection part 32 of the junction part 30" b, and it protrudes in the position extended in the longitudinal direction and given in the longitudinal direction. (32) The inner circle 34 is disposed, and the free end of each chain 31 is connected thereto as shown in FIG.

The provision of the iron plate 33 may increase the rigidity of the connecting portion, keep the height of the rubber dam constant, and reduce the number of chains to be connected.

And, the plate-like junction 30b of the flexible plate 30 can be disposed upstream and secured to the bottom, thereby advantageously reducing this material caught between the bottom and the bottom inflatable chamber. In this case, it is desired to fix the tongued poriton 30'b with the chain 31.

In the embodiment of FIG. 25, the flexible plate 40 shown in FIG. 13 is fixed to the lower bed 4 with the foundation bolt 5, the washer 27 and the nut 7, and is expanded by the supply of fluid. do.

In the embodiment of FIGS. 23 to 25, a flexible plate body, each having a plurality of expandable chambers and manufactured by press molding, is used as a collapsible rubber dam, but a plurality of separate plate bodies are placed on only one position as shown in FIG. The other one is stacked.

In the embodiment of FIG. 26, the first flexible plate 50 has its expandable chamber 50'a while its plate-shaped joint 50b is fixed to the lower bed 4 with a foundation bolt 5, a nut 7, and the like. The second flexible plate body 50 'in such a manner that the free end of the plate flat joint 50'b is disposed at a position facing the upstream side above the plate joint 50b so as to be disposed on the expandable chamber 50a. The joint 50'b is fixed to the lower side with a foundation bolt 5, a nut 7 and the like.

When each expandable foil is expanded by fluid supply, the expandable chamber 50'a of the second plate 50 is disposed directly above or slightly downstream of the expandable chamber 50a of the first plate 50, and the first expandable chamber 50a. Is covered by the elongated plate-like junction 50'b of the second plate body 50'a, thereby easily achieving a two-stage folding rubber dam.

Then, a suitable position of the plate-shaped joint portion 50'b to allow water to penetrate into the spaces S ₁ and S ₂ formed of the first plate body 50, the second plate body 50 ', and the lower bed 4 is provided. It is desired that the second flexible plate 50 'under the expanded state be stabilized by drilling a hole (not shown) in the hole.

In consideration of the reverse flow, it is preferable to fix the tongue portion 50 "b of the second plate body 50 'to the lower bed 4 with the chain 31.

As in the example of FIG. 27, two or more flexible opposite ends are connected by bolts 5 'and nuts 7 to form a multistage folding rubber dam.

As described above, a collapsible rubber dam of the required height is easily manufactured by stacking a plurality of expandable chambers so that the function of the dam is sufficiently retained by the other expandable chamber even if one of the expandable chambers is relaxed by damage. In addition, since the dam height of the n + 1 stage is adjustable when using n expandable chambers, the dam level is effectively adjusted.

In addition, the time required for expansion or relaxation of the expandable chamber is considerably shortened in the multistage rubber dam, as compared with the single-chamber commercial dam in which the multistage folding rubber dam as described above is made of the same height rubber sheet material. Is established.

V ₀ ＞ V ₁ + V ₂

P ₀ ＞ P ₁ + P ₂

Where V ₀ and P ₀ are the volume and internal pressure of the commercial stage chamber dam, respectively, and V ₁ and P ₁ are the volume and internal pressure of the first expandable chamber of the two-stage dam according to the invention, respectively, V _2. And P ₂ indicate the volume and internal pressure of the second expandable chamber of the two-stage dam, respectively.

When using a flexible plate body having two or more expandable chambers connected to each other as shown in Figs. 23, 25 and 27, the operation for fixing the bed is fairly simple and the local work is excellent.

As described above, each flexible plate body is fixed at the upstream or downstream side of the lower end thereof, so that they can exhibit a dam effect desired for normal use of forward flow.

When they are located at the junction between the mainstream and the stream or near the mouth of the stream, if there is a temporary reflux during the flood, there is a risk of causing damage due to excessive force.

Figures 28-32B now show examples of collapsible rubber dams capable of retaining a stable dam height for both front and rear flows.

In the embodiment of FIG. 28, the collapsible rubber dam is a flexible plate body 60 having a hollow splitting part or an expandable chamber 60a and two joining parts 60b and 60c.

As shown in FIG. 28, the plate-shaped joint 60b is located upstream and the plate-shaped joint 60b is located downstream. Thus, the flexible plate 60 has a foundation bolt 5, a pressing member 6, and a nut 7. It is fixed to the lower bed 4.

FIG. 29 shows the flexible plate 60 in an expanded state with a fluid supply used for forward flow. In this case, the amount of foreign matter between the bed and the dam is very small. Further, since the sheet-shaped portion 60d extends from the expanded portion 60a to the plate-shaped joint portion 60b on the downstream side, the water flows upward along the dam 60d along the sheet-shaped portion 60d without falling down on the lower and upper lower sides. As a result, excavation of the bed is completely prevented.

When the collapsible rubber dam is designed from the flexible plate body 60 of FIG. 28, if the height of the dam and the positions of the plate-shaped joints 60b and 60c to be fixed on the lower surface are determined in advance, the plate-shaped joint 60c and the sheet are determined. The total length L of the shaped portion 60d is measured by the following equation based on FIG. 28 and FIG.

의 관계를 가진다.First of all, Length L is

Has a relationship with

의관계가 성립되며, 제29a도에서 피타고라스 정리로부터On the other hand, in FIG.

Relation is established, and from Pythagorean theorem in

Relationship is established. If the values of L ₁ , L ₄ and S are determined in advance, the values of L ₂ and L ₃ are measured from this relationship.

The expanded rubber dam 60 of FIG. 29a changes to the same state as that of FIG. 29b upon inducing a backflow during flooding. In this case, since the plate-shaped junction 60c is connected to the taut chamber 60a through the sheet-like portion 60d, the rubber dam 60 itself is not pushed upstream, and as a result, excessive force is applied to the fixing portion of the rubber dam. It doesn't work.

By combining the flexible plate 60 of FIG. 28 and the flexible plate 20 of FIG. 9 as shown in FIG. 30, a multi-stage folding rubber dam having a high dam height is simply produced.

In the embodiment of FIG. 31, the collapsible rubber dam is made of a flexible plate body 70 having a hollow partition or expandable chamber 70a, plate-shaped joints 70b and 70c and tongue 70d, and a plate-shaped joint. 70c projects beyond the tongue portion 70d toward the downstream side from the center position of the lower surface of the expandable chamber 70a. This flexible plate body 70 is simply manufactured similarly to the formula described in manufacture of the flexible plate body 1 of FIG.

32a and 32b show the flexible plate 70 of FIG. 31 fixed to the lower bed 4 in the expanded state by the fluid supply, respectively, and FIG. 32a shows the expanded state under forward flow, and FIG. 32b shows the rear flow under The expansion state of is shown.

In the embodiment of FIG. 32, the sheet-like plate-like junction 70c protects the lower bed from damage due to the falling of the flood and thus does not cause excavation downstream of the lower bed. In the embodiment of FIG. 32B, the tongue 70d protruding from the pointed end of the expandable chamber 70a effectively serves as a backflow preventing plate. And the flexible plate 70 of FIG. 31 has a remarkable effect as an adjuvant etc. to prevent backflow completely.

The flexible plate body of FIGS. 28 and 31 forms a set of plate-shaped joints which are fixed on the lower side of the downstream and upstream shafts by press molding, and expandable chambers which extend between each other are very easy to fix on the bottom, and hinder the flow of water. Flat in a relaxed state.

On the other hand, even if a backflow occurs during flooding, since the plate-like joint portion is connected to the expandable chamber on the downstream side, the backflow can be completely prevented because the excessive force does not act on the fixing part of the flexible plate body.

)부에서 구겨지는 현상이 발생된다. 이런 현상은 절첩식 고무댐이 이완된 상태에서 하상과 하천제방에 밀접하게 접촉하지 않으면 안되는 설계조건에 의해 불가피한 것이다.Obvious in FIGS. 33 and 34 when the flexible plate 20 is stretched between the river banks, fixed to the river banks and the river banks and expanded by fluid supply to form a collapsible rubber dam as shown in FIG. As such, the expansion chamber in the vicinity of the intersection between the riverbed and the riverbank (

Crumpling occurs at the part. This phenomenon is inevitable due to the design conditions that must be in intimate contact with the riverbed and the river bank with the folded rubber dam relaxed.

)에서 감소하며, 결과적으로 상류측으로부터 하류측으로 댐의 물의 누설이 그런 규겨진 부분(

)에서 발생하므로 댐 효과는 만족스럽게 달성되지 못하기도 한다. 그리고, 구겨진 부분 (

)와 그 부근이 직접 태양에 노출될때 균열이 발생하기 쉽고 따라서 댐의손상을 유발한다.Now, when the wrinkling occurs in the expanded state of the flexible plate, the dam height

) And consequently the leakage of water from the dam from upstream to downstream

), The dam effect may not be satisfactorily achieved. And crumpled portions (

) And its surroundings are likely to crack when exposed directly to the sun, thus damaging the dam.

In order to prevent the occurrence of wrinkles, the expandable chamber of the flexible plate is reinforced with a knitted fabric as shown in FIG. 35 as described above.

In the embodiment of FIG. 35, the flexible plate body 80 is associated with a hollow split or expandable chamber 80a, an expandable chamber, and embedded in a reinforcement material in the plate-like joint 80b and the expandable chamber extending in the longitudinal direction thereof. It consists of a knitted fabric 3, which is the modified embodiment of FIG.

By cutting the expandable chamber 80a as a reinforcing knitted fabric, by cutting a plain fabric made of synthetic fibers such as nylon tetron at a given bias angle, and dropping a superior tire cord normally used as a tire reinforcing material at a given declination angle. It is by the thing.

The declination of the knitted fabric 3 is determined by the rise of the river bank, but it is desired to be 54 ° 44 'or less.

The flexible plate 80 is fixed to the river bank 8 and the river bed 4 in the manner described above with bolts and nuts, expanded by fluid supply, and contraction of the knitted fabric 3 as shown in FIG. A folding rubber dam is formed in which there is no crumpled portion.

As described above, the declination angle of the knitted fabric to be embedded for producing the folded rubber dam without the crumpled portion is determined as follows. That is, the wrinkling is caused by the fact that the government length L of the dam is different from the total length of the dam fixed on the river bed and the river bank (l ₁ + l ₂ + w). Thus, if the declination is determined to absorb the difference between the government length and the total length ((l ₁ + l ₂ + W) -L), no wrinkling occurs. In other words, since the length to be shrunk is determined from the elevation of the river bank and the dam height, the declination angle is selected so that the shrunk length can be balanced.

For example, the rising α of the river bank is tan α = 1/2, and the declination angle is about 45 °.

The degree of shrinkage of the flexible plate 80 reinforced with the knitted fabric 3 will be described with reference to the following experiment.

A collapsible rubber dam comprising five model scale flexible plates of about 30 cm high and about 3 m long with a knitted fabric consisting of nylon fibers buried at an angle of 45 ° with respect to the horizontal direction around the inflatable chamber 80a. ) Was provided.

Four measurement points were substantially determined in advance in the center of the rubber dam of FIG. 38, and the change in distance between the measurement points with respect to the internal pressure of the expandable chamber was measured to obtain a result as shown in Table 1 below.

[Table 1]

At the same time as the internal pressure increases from the measurements in Table 1, the declination approaches the angle of repose (54 ° 44 '), the distances A and B in the longitudinal direction of the dam are extracted, and the distances C and D in the height direction. E) is elongated to increase the dam height (H). This indicates that the knit fabric contributes to preventing wrinkling.

When the flexible plate 80 of FIG. 35 is inflated by fluid supply, the tongue 80c forms wrinkles by the contraction phenomenon of the knitted fabric 3 of FIG. These corrugations have the effect of cutting the dams, resulting in suppressed vibrations of the dams themselves, improving noise suppression and durability.

According to the present invention, wrinkling, which was unavoidable at the end of the war, is completely prevented by reinforcing at least the expandable chamber with the knitted fabric as described above. As a result, the occurrence of cracks occurring in the crumpled portion and leakage from the upstream side to the downstream side In addition, maintenance of the appropriate dam height and weather resistance are improved.

를 포함하는 고무 댐의 양단부는 각각 제39도와 제40도에 도시된 가요성 시이트(81)를 국부적으로 씌워진다. 즉, 상류측에 위치하는 가요성 시이트(81)의 단부는 제5도에서 서술된 가요성 판체(80)의 판형 접합부와 함께 하상(4)와 하천제방(8)에 고정되며(제40도 참조) 가요성 판체(80)의 구겨진 부분(

)를 씌우기 위하여 하류측을 향해 가요성 시이트(81)의 타단부는 자유롭게 늘어져 있다(제39도 참조). 이경우 하류유동의 표면과 가요체 시이트(81)의 자유단부만이 접촉하는 것이 소망된다.Even if the expandable chamber is reinforced with a knitted fabric, wrinkles can occur if the bank banks are excessively inclined. In this case, each crumpled portion near the river bank

Both ends of the rubber dam comprising a local cover is locally covered with the flexible sheet 81 shown in FIG. 39 and FIG. 40, respectively. That is, the end of the flexible sheet 81 located upstream is fixed to the lower bed 4 and the river embankment 8 together with the plate-shaped joint of the flexible plate body 80 described in FIG. Crumpled portion of flexible plate 80

), The other end of the flexible sheet 81 is freely stretched toward the downstream side (see FIG. 39). In this case, it is desired that only the free end of the flexible sheet 81 contacts the surface of the downstream flow.

)를 완전히 씌우며, 고무댐의 이완시에 구겨짐 없이 평탄한 형상으로 하상과 하천 제방에 밀착할 수 있다. 그리고, 본 발명은 제41a도 내지 제41도의 가요성 판체를 참고로 설명될 것이며, 여기서 가요성 판체(90)은 공급되는 유체를 팽창성 챔버로 좀더 원활하게 송출하기 위하여 주 팽창성 챔버(90a)와 보조 팽창성 챔버(91)을 가진다.That is, the flexible sheet 81 is a crumpled portion under the expansion of the rubber dam (

), It is completely covered and can be in close contact with river and river banks in a flat shape without wrinkling when the rubber dam is relaxed. And, the present invention will be described with reference to the flexible plate of FIGS. 41a to 41, wherein the flexible plate 90 and the main expandable chamber 90a to more smoothly deliver the supplied fluid to the expandable chamber. It has a secondary expandable chamber 91.

41A to 41, the diameter of the auxiliary expandable chamber 91 is smaller than the diameter of the main expandable chamber 90a and forms a thick portion of the main expansion chamber 90a along its longitudinal direction.

To supply fluid to the flexible plate 90 to expand the collapsible rubber dam, for example, there is a piping system for supplying and discharging fluid as shown in FIG. 42, and 93 adds the fluid to the main expandable chamber 90a. Supply pipe 94 denotes a pipe for supplying fluid to the auxiliary expandable chamber, denoted V ₁ , V ₂ , V ₃ dimmed V ₄ denotes a valve, denoted E as an injector, denoted p as a pump or air extruder.

When the flexible plate 90 expands as shown in FIG. 41A, the valves V ₁ are opened, the valves V ₂ , V ₃ and V ₄ are closed, and fluids such as air and water By operation of the pump p, it is pumped into the main expandable chamber 90a through the pipe 93. In this case, expansion of the auxiliary expandable chamber 91 by the fluid supply is not necessary.

When the expanded rubber dam relaxes, only the valve V ₂ is opened to release the fluid that was filled in the main expansion chamber into the atmosphere. However, it is desired to operate the pump p with the valves V ₁ , V ₂ and V ₃ open and the valve V ₄ closed in the piping system of FIG. 42.

In the latter case, the fluid filled in the main expandable chamber 90a is forcibly discharged from the valve V ₃ by the action of the injector E, and the auxiliary chamber 91 is inside the main expansion chamber 90a. Inflated to protrude. The expanded rubber dam then begins to relax quickly into the main expandable chamber portion which unbalances the relationship between the main expansion chamber 90a and the externally actuated hydraulic pressure.

In a commercial rubber dam made from rubber sheet material, when the inlet hole for fluid supply is disposed in the first end of the dam as shown in Fig. 42, if the relaxation starts from near the center of the dam in the longitudinal direction, the opposite inner walls of the expandable chamber are separated from each other at the The close contact makes it impossible to pump the fluid filled in the space between the loose end and the other end of the dam without the inlet hole, resulting in abnormal relaxation of the dam.

In order to prevent abnormal relaxation, a plurality of inlet holes are opened on the side facing the lower bed, and are hermetically connected to the pipe buried in the lower bed. Thus, piping work is usually very complicated in the production of rubber dams.

On the contrary, even when the rubber dam according to the present invention starts to relax at any position in the longitudinal direction, the auxiliary expandable chamber 91 protrudes inside the main expandable 90a to form a continuous gap 92 as shown in FIG. 41B. Opposite inner walls of the primary expandable chamber 90a do not adhere to each other by hydraulic pressure. Further, since the continuous spacing 92 extends in the longitudinal direction along the auxiliary expandable chamber 91 to the inlet hole, the fluid staying in the main expandability 90a is completely transferred from the inlet hole to the atmosphere through the continuous spacing 92. Is released.

In general, the fluid staying in the main expandable chamber 90a moves toward the downstream side under the influence of the flow of the water in a relaxed state, so that the auxiliary expandable chamber 91 is disposed downstream to form the continuous spacing 92 on the downstream side. It is desirable to deploy. Thus, the rubber dam itself is fully relaxed with the auxiliary expandable chamber 92 intact.

The diameter of the secondary expandable chamber 91 is significantly smaller than that of the primary expandable chamber 90a so that the secondary expandable chamber 91 does not interfere with water flow even under the expanded state. Then, the fluid filled in the auxiliary expandable chamber 91 is discharged to the atmosphere for a long time by opening the valve V ₄ .

Alternatively, the fluid filled in the auxiliary expandable chamber closes valves V ₁ and V ₃ , opens valves V ₂ and V ₄ , and is forced out through the operation of pump p. You can also Then, the fluid filled in the auxiliary expandable chamber 91 can be quickly released by installing an air permeable canvas in the auxiliary expandable chamber 91. Thus, the rubber dam is completely relaxed as shown in Fig. 41C.

According to the present invention, the expansion and relaxation of the rubber dam is performed simply and completely by arranging the inlet hole at the end of the dam without using a plurality of inlet holes connected to the pipe buried in the lower bed, so that the operability and operability are excellent. Do.

And since the thicker and highly rigid flexible plate 90 can be easily manufactured by press molding as described above, the continuous spacing 92 can be reliably formed by the auxiliary expandable chamber 91. The auxiliary expandable chamber 91 may be formed in a thick portion of the main expandable chamber 90a as shown in FIG. 41C, but may be formed separately on the inner wall surface of the main expandable chamber 90a. In the latter case, the auxiliary expandable chamber 91 may be adhered to its inner circumference with the inner wall of the main expandable chamber 90a separated by an adhesive.

If the stiffness of the main expandable chamber 90a is sufficient, one of the auxiliary expandable chambers 91 adheres to the inner wall of the main expandable chamber 90a by means of an adhesive or does not use a fixing agent, but the main expandable chamber 90a It is placed inside.

The plurality of auxiliary auxiliary expandable chambers 91 are connected to each other.

In the embodiment of FIGS. 43A and 43B, the secondary expandable chamber 101 of the flexible plate 100 fills the solidified flowable material 102 at room temperature instead of the fluid.

As the fluid material 102, chemical substances such as asphalt, thermoplastic resins, oil in water, paraffin, or other chemicals such as liquid rubber cement, urethane resins, and epoxy resins are used.

Fluid 102 is preferably pumped to one end of chamber 101 to fill the secondary expandable chamber and solidify at room temperature.

Expansion and relaxation of the flexible plate 100 are performed using a piping system as shown in FIG. 42 except that the piping 94 is omitted.

When the expanded rubber dam 100 as shown in FIG. 43a is relaxed in the state as shown in FIG. 43b, the auxiliary expandable chamber 101 holding the flow material 102 protrudes into the main expandable chamber 100a. 103 is formed inside the main expandable chamber 100a along the longitudinal direction.

As a result, even when water pressure is applied to the main expandable chamber 100a from the outside, opposite inner walls of the main expandable chamber 100a do not adhere to each other. Thus, the flexible plate 100 is completely relaxed by releasing the fluid that has stayed in the main expandable chamber 100a from the inlet hole through the continuous spacing 103 to the atmosphere.

According to the present invention, one or more grooves extending in the longitudinal direction may be formed in the inner wall of the expandable chamber or hollow division of the flexible plate instead of having an auxiliary expandable chamber as in the example of FIGS. 44A and 44B. have.

In the embodiment of FIGS. 44A and 44B, six grooves 111 are formed in the inner wall of the expandable chamber 110a of the flexible plate 110.

In the manufacture of the flexible plate body 110, the groove forming member is inserted at a given position to form the expandable chamber 110a between the two raw rubber sheets along the longitudinal direction prior to the press forming.

In some cases, it is necessary to keep the long flexible plate in a wound state without drawing the molding member. For this reason, it is desired to use a rubber body with a leading rod or a fully packed rubber body as a molding member.

When using such a molding member, it is necessary to cover the molding member with an anti-sticking agent for preventing adhesion to the raw rubber sheet, and as a result, it is easier to pull out the molding member after press molding.

Expansion and relaxation of the flexible plate 110 are performed in the same manner as described above.

When the expanded rubber dam 110 of FIG. 44A relaxes from any position along the longitudinal direction in the same manner as in FIG. 44B, the opposite inner walls of the expanded chamber 110a adhere to each other by hydraulic pressure acting from the outside. Since the groove 111 exists in the inner wall of the expandable chamber 110a in the longitudinal direction, the fluid settling in the expandable chamber 110a is completely discharged from the inlet hole to the atmosphere through the groove 111. As a result, the rubber dam 110 is completely relaxed as shown in Figure 44b without abnormal relaxation.

In the embodiment of FIG. 44, the groove 111 has a rectangular cross section, but the cross section of the groove may be made semi-circular.

In the latter case, since a molding member having a circular cross section can be used, the drawing becomes easier. In addition, as shown in FIG. 45, the circular groove 121 may be located at both ends of the relaxed expandable chamber 120a of the flexible plate 120.

In this embodiment, since the circular groove 121 can reduce strain occurring at the end of the expandable chamber 120a during expansion, the expandable chamber 121a is more durable.

The number of grooves may be arbitrarily selected, but is not limited thereto. And although it is desired to collect the grooves near the inlet hole, it is actually sufficient to substantially extend the grooves over the total length of the rubber dam without collecting them.

In the embodiment of FIG. 46, the flexible plate body 130 having the open partition 130a having a longer width than the lower sheet portion is based on its free end such that the free ends of the upper and lower sheets abut. The bolt 5, the pressing member 6 and the nut 7 are fixed to the lower bed 4. As a result, the space 131 is always formed inside the expandable chamber 130a of the divided portion or the rubber dam 130 under the relaxed state.

Therefore, abnormal relaxation of the rubber dam can be prevented even when the inlet hole for supplying fluid to the expandable chamber is located at only one end of the rubber dam.

In addition, the space 131 serves to cushion the impact of the rock, such as the rock.

As shown in FIG. 46, the channel 133 having the arc-shaped cross section is further disposed near the junction 132 between the upper and lower sheet portions, so that the effect of releasing the fluid filled in the expandable chamber is further secured during relaxation of the rubber dam.

In addition, since the channel 133 serves to disperse the strain around the junction 132 during the expansion of the rubber dam, the durability of the rubber dam is considerably improved. And the formation of the channel 133 is performed simply by arrange | positioning a nylon rod near the junction part between upper and lower sheet parts at the time of manufacture of the flexible plate body 130. FIG. In this case, the nylon rod is easily removed because there is an open powder part.

47A and 47B are examples of fixing the flexible plate body shown in FIG.

In the embodiment of FIG. 47A, the free end 1a of the flexible plate 1 faces upstream and is disposed above the lower bed 4.

The U-shaped metal coupling member 15 is then free along with the sealing material (not shown) along the longitudinal direction of the flexible plate 1 to form an expandable chamber 9 which develops a good air tightness under expansion. It is inserted between the ends 1a. That is, the coupling member 15 forms part of the expandable chamber 9 of the collapsible rubber dam. Subsequently, the foundation bolt 5, which is embedded in the lower bed 4 in advance, is pressed against the pressing member through a hole opened at a given position of the flexible plate 1 and the coupling member 15 near the free end 1a. 6) and nuts (7).

Thus, the flexible plate body 1 is hermetically fixed to the lower bed 4, and the continuous spacing 16 is formed by the coupling member 15 inserted in the longitudinal direction between the free ends.

In the embodiment of FIG. 47A, the expansion and relaxation of the rubber dam during the supply or discharge of the fluid is performed because the coupling member 15 also acts as a mounting member at the portion fixed to the lower bed 4 of the flexible plate 1. Undisturbed Thus, the coupling member 15 extends to a given position of the river embankment 15. And, the coupling member 15 is sufficiently part of the expandable chamber and thus can be disposed at any position of the expandable chamber as is apparent in the following example, but the coupling member is fixed at the position fixed to the lower bed 4 as shown in FIG. 47A. It is desired to arrange 15.

In the latter case, the fixing operation of the flexible plate 1 becomes more advantageous.

In the embodiment of FIG. 47B, the free end 1a of the flexible plate 1 faces downstream, and the tongue portion 12 of the plate 1 has a base bolt (1) on the upstream lower top 4 as described above. 5), the pressing member 6 and the nut (7) is fixed. In this case, the U-shaped metal coupling member 15 is inserted between the free ends 1a and tightened by the bolt 5, the pressing member 6 and the nut 7.

In this embodiment, expansion and relaxation of the dam may not be performed smoothly when the coupling member 15 is present over the total length of the rubber dam 1. Therefore, it is desired to insert the coupling member 15 only between the free ends 1a commonly used in the lower bed 4.

And although the U-shaped metal coupling member 15 is used as a rigid coupling member in the Example of FIG. 47B, plastics, rigid rubber, the rubber which embedded various reinforcement materials, etc. can be used. In any case, the coupling member is generally rigid enough to withstand hydraulic pressure in a relaxed state.

According to the present invention, since the thick flexible plate is easily manufactured by press molding as compared to a commercial sheet material, it is excellent in durability and weather resistance of the plate when used as a folding rubber dam.

In particular, the rubber dam is required to have a certain safety against collapse from the viewpoint of river flow restriction.

The invention will now be described with reference to examples of flexible plates with improved safety as folding rubber dams.

In the embodiment of FIG. 48, a separating wall 141 is disposed in the hollow partition of the flexible plate 140 or the expandable chamber to divide the expandable chamber into two chamber portions 140a and 140a '. In this case, the dividing wall 141 has a width substantially equal to the circumferential length half of the inflatable chamber. And, a plurality of separation walls, each having an arbitrary width, are used to divide the inflatable chamber into the desired chamber portion.

The flexible plate 140 can be easily manufactured by press molding starting with a suitable number of raw rubber sheets and an anti-sticking agent. The plate 140 can be expanded to a state like FIG. 48 using a piping system such as FIGS. 49 and 50.

As shown in FIG. 50, two flanged nipples 10 and 10 'are inserted into one end of the flexible plate body 140 so that the expandable chamber portions 140a and 140'a are in contact with each other. The separating wall 140 is inserted around the top and bottom of the, and then the end portions of the plate bodies with nipples are inserted between the sets of pressing members 11 'each having a semicircular curved portion, and tightened with bolt nuts.

Nipples 10 and 10 'are then connected to piping 142 and 143 in the piping system of FIG. 49, respectively.

When the flexible plate 140 is expanded in the same state as FIG. 48 using the piping system of FIG. 49, the valves V ₁ and V ₂ are open, and the valves V ₃ and V ₄ are open. Is closed.

Thereafter, an air compressor or pump p is operated to supply fluid such as air, water, or the like, to the two expandable chamber portions 140a and 140'a through piping 142 and 143.

In the embodiment of FIG. 48, the fluid is filled with substantially equal internal pressure to each of the expandable chamber portions 140a and 140a ', but the internal pressure within the expandable chamber may be different. And only one expandable chamber may be expanded.

In the rubber dam of FIG. 48, the rubber dam is maintained because the airtightness of the other expandable chamber portion 140a 'is maintained even if one of the expandable chamber portions is damaged by an accidental impact such as driftwood or rolling dark color. Has a certain dam height without complete relaxation.

As a result, downstream flood damage can be prevented from accidental relaxation of the dam. The given dam height may be maintained by further supplying fluid to the expandable chamber portion 140a through the pipe 143 after the expandable chamber portion 140a is broken.

Relaxation of the rubber dam 140 is performed in the manner described in the piping system in FIG.

51 to 53 show a modified embodiment of the flexible plate body 140 with the door wall 141 of FIG. This embodiment has a means for releasing the rubber dam quickly and completely as shown in FIGS. 41A and 44A even when the piping supply and discharge piping system as shown in FIG. 49 is located only at the end of the rubber dam.

In the embodiment of FIG. 51, two auxiliary expandable chambers 145 are formed on the inner walls of the expandable chamber portions 140a and 140a constituting the main expandable chamber of the flexible plate 140, and extend along the longitudinal direction. do.

Since the diameters of the auxiliary expandable chambers 145 and 145 are considerably smaller than the diameter of the main expandable chamber, they may be provided separately on the main expandable chamber differently from FIG.

In the embodiment of FIG. 52, the auxiliary expandable chamber 145 is formed substantially in the center of the dividing wall 41 along the longitudinal direction, unlike FIG. 51.

When relaxing the flexible plate 140 as shown in FIGS. 51 and 52, the auxiliary expandable chamber 145 protrudes into the main expandable chamber under an expanded state to form a continuous gap extending to the inlet hole along the longitudinal direction. Thus, the fluid staying in the main expandable chamber is completely discharged to the atmosphere through the gap without opposing inner walls of the main expandable chamber sticking to each other.

With implantation, the flexible plate 140 of FIGS. 51 and 52 can be fully relaxed without the occurrence of abnormal relaxation.

In the embodiment of FIG. 53, a plurality of grooves 146 are formed in the inner walls of the expandable chamber portions 140a and 140a 'along the length direction instead of the auxiliary expandable chamber 145. In this case, full relaxation can be expected because the groove 146 exerts a similar function as the auxiliary expandable chamber 145. In addition, grooves 146 may be formed on both sides of the separation wall 141 instead of the inner wall of the main inflatable chamber.

In the above embodiment, the dividing wall 141 may be made of an elastic material such as rigid plastic. In this case, the rubber dam can be relaxed more easily.

54A and 54B show a plurality of ridges 151 and grooves 152 provided in at least a portion of the outer surface of the expandable chamber 150a or the closed partition along the longitudinal direction of the flexible plate 150. An embodiment of the flexible plate 150 is shown.

The manufacture of the flexible plate body 150 having a rough surface is carried out in the same manner as the press molding described above except that the rough canvas is inserted between the upper or lower surface of the raw rubber sheet and the surface plate at a predetermined position.

After press molding, the flexible plate body 150 having the ridges 151 and the grooves 152 on its outer surface is manufactured by removing the rough canvas.

It is desired that a plurality of ridges 151 and grooves 152 be provided on at least a portion of the outer surface of the expandable chamber 150a including the area of the maximum dam height under the expanded state as shown in FIG. 54B.

When the ridges 151 and the grooves 152 are formed on the outer surface of the expandable chamber 150a, tensile stress uniformly operated on the entire outer surface of the expandable chamber having a flat and smooth outer surface is dispersed in the raised and grooves, mainly the grooves. Are concentrated within. And, because most of the grooves are raised, they are not directly exposed to the sun's rays.

In general, the smooth outer surface of an expandable chamber is susceptible to cracking in areas exposed to sun light under the influence of tensile stress.

According to the present invention, the area exposed to the sun's rays is reduced by forming bumps and grooves, and since the tensile stress tends to be concentrated in the grooves or the unexposed areas, the occurrence of cracks on the rubber surface due to the exposure of the sunlight is effectively As a result, durability and weather resistance are significantly improved. And there is no risk of causing the loss of the worker walking on the rubber dam under the expanded state of FIG. 54b.

In the embodiment of FIGS. 54A and 54B, the dimensions of the ridge 151 and the groove 152 are as follows. That is, the width of the ridge is 10 mm or less, and the width and depth of the groove are 10 mm or less, respectively.

The width and depth of the ridges and grooves are each about 3 mm desired. In order to effectively prevent the occurrence of cracking, it is desired that the depth of the groove is somewhat longer than the height of the ridge and the groove.

The ridges and grooves are provided on the outer surface of the expandable chamber by a process of roughening the surface after press molding, or a sheet material having a plurality of ridges and grooves is separately attached to the flexible plate body.

According to the present invention, since the flexible plate body as the folding rubber dam is formed in advance in a flat shape corresponding to the relaxed state of the rubber dam by press molding, local work such as folding the sheet material in the fixing operation is unnecessary. In addition, since a thick flexible plate is easily manufactured as compared with a commercial rubber dam made of a rubber sheet material, damage of the rubber dam hardly occurs, and durability and weather resistance are significantly improved. And, under the relaxed state, no special stress concentration occurs in any part of the flexible plate, so that the occurrence of cracks is effectively prevented.

In fixing to the riverbed and river banks, the flexible plate body according to the present invention is directly and tightly fixed to the riverbed and river banks by means of foundation bolts and nuts, and the fixing operation is very easy, and the fixing efficiency is further improved.

In addition, since the airtightness of the plate is sufficiently examined at the manufacturing site when the divided portion of the flexible plate is a hollow division, the fixing operation is significantly improved.

Claims (1)

Extends along the length direction under a relaxed state, and is composed of a flexible plate made of an elastic rubber material having one or more divided portions at predetermined positions in the thickness direction, and a member for hermetically fixing the plate to the riverbed and the river bank. The division is terminated in the flange portion extending in the thickness direction, the flange portion to reduce the cracks and stress under the relaxed state by preventing the folding in the plate body, the partition defines the expandable chamber under the expanded state to supply the expansion fluid Folding rubber dam to hold.

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