JP2014234668A - High pressure gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high pressure gate for making both compatible in sure water cutoff and reduction in force required for opening-closing a door body.SOLUTION: The high pressure gate is installed in a water discharge passage, and is used as a main gate. The high pressure gate comprises a door stop arranged in the water discharge passage, the door body for blocking up the water discharge passage by abutting on the door stop and capable of opening the water discharge passage by moving from the door stop and low friction rubber 13 installed on the door stop side and abutting on the door body or the door stop when blocking up the water discharge passage. The low friction rubber 13 comprises watertight rubber 12 having a convex part 14 fixed to the door stop or the door body on one side and an ultrahigh molecular weight polyethylene film 45 provided on the convex part 14 of at least the watertight rubber 12.

Description

  The technology disclosed in the present specification relates to a high voltage gate used for a dam or the like.

  Sluice facilities are widely installed in rivers, canals, lakes and reservoirs. Among the sluice facilities, high-pressure gates provided in dams and the like are subjected to a higher pressure when closed compared to sluice facilities for rivers and the like, so higher water stopping capability is required.

  Patent Document 1 discloses a sliding high-pressure radial gate, which is one of high-pressure gates. This high-pressure radial gate has a door body that is slidably supported in the vertical direction with respect to the shaft, a skin plate attached to the convex surface of the door body, and a water stop rubber disposed on the periphery of the sluice gate. (Watertight rubber). The water blocking rubber is arranged in a frame shape and is in sliding contact with the skin plate, so that even when a high pressure is applied to the door body, water leakage can be more reliably suppressed.

  Further, Patent Document 2 is a high-pressure radial gate, in which a large number of water passage holes are provided in the projecting portion on the periphery of the opening of the water discharge channel, and a water stop rubber is provided on the peripheral surface side of the dam opening via a support material. Wearing is disclosed. Patent Document 2 discloses a technique in which a water-stopping rubber is provided in a frame shape and a room for preventing negative pressure from being generated in the water-stopping rubber is disclosed.

Japanese Utility Model Publication No. 57-50366 Japanese Utility Model Publication No.57-6687

  In the high-pressure gate described in Patent Document 1, the water stop rubber can perform water stop well when fully closed. Moreover, in the high-pressure gate described in Patent Document 2, water stoppage efficiency can be improved by putting pressure water into the back surface of the water stop rubber.

  Here, the high-pressure gate has a main gate (see reference numeral 7 in FIG. 1) responsible for a water stop function and a repair gate (sub-gate; see reference numeral 9 in FIG. 1) provided on the upstream side of the main gate. . The sub-gate is a gate for closing the main gate so that water does not enter when the main gate is repaired. After the main gate is repaired, the main gate is closed and the water filling pipe (reference numeral 10 in FIG. 1). Water) is refilled from the dam lake into the water discharge channel. In this state, since water pressure is applied from both the front and rear sides of the door body, a large pressure difference does not occur between the front and rear of the door body when the sub-gate is opened. For this reason, the force required to open and close the sub-gate is relatively small.

  On the other hand, the main gate normally opens and closes with the sub-gate open, so that when the main gate is closed, water exists only on the upstream side of the door body, and the main gate door body has a sub-gate door body. Compared with, very large water pressure is applied. For this reason, when using a high-pressure gate as a main gate, it is necessary to raise and lower the door body in a state in which water-stopping rubber is pressed against the skin plate in order to prevent water leakage, and a large force is required to open and close the door body. It will be.

  Therefore, even when the high-pressure gate described in Patent Documents 1 and 2 is used as the main gate, the frictional force between the water stop rubber and the skin plate becomes too large, and a large force is required when the high-pressure gate is changed from the closed state to the open state. Therefore, further reduction of the frictional force is required. However, simply reducing the frictional force between the water-stopping rubber and the skin plate is likely to cause water leakage when the gate is closed, so it is not easy to solve the problem in a form that can be put into practical use.

  In view of the above-described problems, an object of the present invention is to provide a high-pressure gate that can achieve both reliable water stop and reduction in force required to open and close a door body.

  A high-pressure gate according to an embodiment of the present invention is a high-pressure gate that is installed in a water discharge channel provided in a dam body and is used as a main gate, and is disposed in the water discharge channel or at a downstream opening end of the water discharge channel. A door body that is in contact with the door stop and closes the water discharge passage, and that can be moved from the door stop to open the water discharge passage, and is installed on the door stop side or the door body side. And a low friction rubber that comes into contact with the door body or the door stop when the water discharge passage is closed. Further, the low friction rubber includes a watertight rubber having a convex portion fixed to the door stop or the door body on one side, and an ultra high molecular weight polyethylene provided on at least the convex portion of the watertight rubber. And a membrane.

  The film thickness of the ultra high molecular weight polyethylene film may be 0.1 mm or greater and 1.0 mm or less.

  The film thickness of the ultra high molecular weight polyethylene film may exceed 0.25 mm.

  In the low friction rubber, a radius of curvature of a contact portion with the door body or the door stop may be 15 mm or less.

  The high-pressure gate described above may be a high-pressure radial gate or a high-pressure roller gate.

  According to the high-pressure gate according to an embodiment of the present invention, the frictional force between the low-friction rubber and the door body or the door stop is greatly reduced by providing the low-friction rubber having the ultrahigh molecular weight polyethylene film. Therefore, the energy required for opening and closing the door can be greatly reduced, and the opening and closing device can be downsized. Furthermore, when the convex part of watertight rubber is fixed to the door stop or door body on one side, the convex part can be somewhat displaced, and both sides of the convex part are fixed Compared to the water tightness, the water tightness can be improved. Thus, according to the high-pressure gate according to one embodiment of the present invention, reliable water stop and reduction of the force required for opening and closing can be realized in a well-balanced manner.

  Moreover, if the film thickness of the ultra high molecular weight polyethylene film is 0.1 mm or more and 1.0 mm or less, the ultra high molecular weight polyethylene film has sufficient practical durability, and the ultra high molecular weight polyethylene film is damaged. Thus, it is possible to reduce the possibility that the force required for opening and closing the gate will rise rapidly. Further, it is possible to make it difficult to peel off the ultrahigh molecular weight polyethylene film.

  In addition, if the film thickness of the ultra high molecular weight polyethylene film is larger than 0.25 mm, the ultra high molecular weight polyethylene film is less likely to be entrapped during transportation when manufacturing low friction rubber or when opening and closing the door body. The fall of sex can be effectively prevented.

  Moreover, since the curvature radius of the contact part with a door body or a door stop in a low friction rubber is 15 mm or less, since the sealing pressure of the low friction rubber in the said contact part can fully be raised, it is preferable. .

FIG. 1A is a cross-sectional view showing the structure of a dam provided with a high-voltage gate according to the first embodiment of the present invention, and FIG. 1B is a front view of the dam. FIG. 2 is a perspective view showing a door-to-door configuration in the high-pressure radial gate according to the first embodiment. FIG. 3 is a perspective view illustrating a configuration of a door body in the high-pressure radial gate according to the first embodiment. FIG. 4 is a perspective view illustrating a configuration of a door body in the high-pressure radial gate according to the first embodiment. FIG. 5 is a cross-sectional view showing the shape of the low friction rubber in the high pressure gate of the present embodiment. FIG. 6 is a diagram showing a change in the coefficient of friction when watertight rubber and low friction rubber are used. FIG. 7A is a photographic view showing the vicinity of a lip portion when watertight rubber is used as the subject rubber, and FIG. 7B is a photograph showing the lip portion when low friction rubber is used as the subject rubber. FIG. FIG. 8A is a photograph showing the corner portion of the low friction rubber when the film thickness of the ultrahigh molecular weight polyethylene film is 0.25 mm, and FIG. 8B is the film thickness of the ultrahigh molecular weight polyethylene film. It is a photograph figure which shows the corner part of the low friction rubber at the time of setting to 0.5 mm. FIG. 9 is a cross-sectional view showing the structure of a dam having a high-pressure radial gate according to a modification of the first embodiment. FIG. 10 is a sectional view showing the structure of a dam having a high-voltage gate according to the second embodiment of the present invention. FIGS. 11A and 11B are a plan view and a cross-sectional view showing a configuration of a high-pressure roller gate that is a high-pressure gate according to the second embodiment.

  The high-pressure gate according to each embodiment of the present invention is disposed in the water discharge channel provided in the dam body or at the downstream opening end of the water discharge channel, and is used as the main gate. Examples of the type of high-pressure gate include, but are not limited to, a radial gate and a roller gate. Hereinafter, the high voltage gate according to each embodiment will be described.

(First embodiment)
−Configuration of high voltage gate−
FIG. 1A is a cross-sectional view showing the structure of a dam provided with a high-voltage gate according to the first embodiment of the present invention, and FIG. 1B is a front view of the dam. FIG. 1A shows a longitudinal section passing through the water discharge channel 5, but the illustration of the emergency water discharge channel 4 is omitted in the figure.

  As shown in FIGS. 1 (a) and 1 (b), a water discharge channel 5 penetrating from the upstream dam lake to the downstream side is provided at the lower part of the dam body 1 that dams the water 3. An emergency water discharge channel 4 is provided at the upper part. Although there may be one water discharge channel 5, a plurality of water discharge channels 5 may be provided. Further, the dam body 1 is provided with a filling pipe 10 that leads from the dam lake to the inside of the water discharge channel 5, and a filling valve 6 that is disposed on the path of the filling pipe 10. As described above, the water filling pipe 10 is provided to introduce the water 3 into the water discharge channel 5 after the repair of the main gate. Therefore, the charging valve 6 is closed at normal times.

  In the water discharge channel 5, for example, a high-pressure radial gate 7 is provided as a main gate, and a high-pressure roller gate 9 having a general shape is provided upstream of the high-pressure radial gate 7 as a repair gate (sub-gate). It has been. The high-pressure radial gate 7 is installed so that it can rotate around the trunnion pin 21a as a rotation axis. In the water discharge channel 5, a space 11 for retracting the door body when the water discharge channel 5 is opened is formed above a portion where the high-pressure radial gate 7 is installed.

  FIG. 2 is a perspective view showing a door-to-door configuration in the high-pressure radial gate according to the first embodiment, and is an enlarged view of a portion A shown in FIG. 1 (a). FIG. It is a perspective view which shows the structure of the door body in the high voltage | pressure radial gate which concerns on embodiment. FIG. 4 is a perspective view showing the configuration of the door body in the high-pressure radial gate according to the first embodiment, and is a view seen from a direction different from FIG.

  As shown in FIGS. 2 to 4, the high-pressure radial gate 7 according to the present embodiment includes a door stop 15 disposed in the water discharge channel 5, a contact with the door stop 15, and closing the water discharge channel 5. It has a door body 8 that can rotate and move from the hit 15 to the upper space 11 to open the water discharge channel 5.

  The door body 8 includes a trunnion pin 21a serving as a rotation shaft, a trunnion hub 21b through which the trunnion pin 21a passes, a skin plate (plate member) 31 having an arcuate longitudinal section, a trunnion pin 21a, and a trunnion hub 21b. Legs 23 for connecting the skin plate 31 are provided. The vertical direction here means a vertical direction parallel to the water flow direction.

  In the example shown in FIG. 3, two upper and lower legs 23 extend from each of the two trunnion hubs 21b. The trunnion pin 21a is fixed to the downstream side of the skin plate 31 that receives water when closed. The skin plate 31 is made of a general structural steel material, for example, a metal such as stainless steel. The length of the upper and lower sides of the skin plate 31 is about 5 m to 10 m, and the length of the left and right sides is about 5 m to 10 m. The length of the leg part 23 is about 5m-10m.

  The door body 8 is further supported by the horizontal main girder 25 that reinforces the leg 23, the plurality of vertical auxiliary girder 29 that supports the skin plate 31 from the back side, the upper girder 33, and the lower girder. 35 and a side roller 27 installed on a side surface of the vertical auxiliary girder 29 located at both ends of the plurality of vertical auxiliary girder 29. As shown in FIG. 4, an opening / closing device such as a hydraulic cylinder 41 is connected to an arc-shaped portion (for example, the upper girder 33) of the door body 8.

  The opening of the water discharge channel 5 provided with the door stop 15 (the boundary portion at the portion where the width becomes wider in the water discharge channel 5) has a shape that matches the arc surface of the door body 8, and the door contact 15 And the door body 8 can be in contact with each other with a low-friction rubber 13 described later interposed therebetween. For example, the dam main body 1 includes an upper door contact member 22, a lower door contact member 20, and a pair of left and right side door contact members 18 which are respectively installed in portions surrounding the opening. FIG. 2 shows only the right side door contact member 18 as viewed from the downstream side among the one side door contact members 18, but the left side of the opening is also symmetrical with the right side door contact member 18. A side door contact member 18 having an arbitrary shape is provided. A space (air box 17) may be formed inside the lower door contact member 20 and the pair of side door contact members 18 as necessary.

  In addition, although the example where the shape of the water discharge channel 5 seen from the upstream side is a quadrangle is shown here, the shape of the water discharge channel 5 is not limited to this, and the shape of the door stop member also depends on the shape of the opening. Can be changed as appropriate. The size of the water discharge channel 5 can be arbitrarily changed depending on the design of the dam. For example, when the upstream opening is a quadrilateral, one side is about 3.0 m to 6.0 m.

  FIG. 5 is a cross-sectional view showing the shape of the low friction rubber in the high pressure gate of the present embodiment. This figure shows a cross section in the thickness direction of the watertight rubber.

  In the high-pressure radial gate 7 of the present embodiment, a low friction rubber 13 that abuts against the door body 8 or the door stop 15 when the water discharge channel 5 is closed is provided on the door stop 15 side or the door body 8 side. The low friction rubber 13 includes a watertight rubber 12 having a convex portion 14 and an ultra-high molecular weight polyethylene film 45 provided on at least the convex portion 14.

  The ultra high molecular weight polyethylene film 45 is bonded onto the upper surface of the convex portion 14 by a method such as vulcanization bonding. The ultra high molecular weight polyethylene film 45 contacts either the door body 8 (specifically, the skin plate 31) or the door stop 15 when the door body 8 is closed.

  In the example shown in FIGS. 2 and 5, the low friction rubber 13 is provided on the door stop 15 side, that is, on the peripheral portion of the opening in the dam body 1, or on the upper door contact member 22 or the lower door contact member 20. It has been. The watertight rubber 12 is made of, for example, natural rubber. Here, the low friction rubber 13 is integrally provided with an upper low friction rubber 13a, a lower low friction rubber 13c, and a pair of side low friction rubbers 13b, and has a frame-like planar shape. In this case, the planar shape of the ultrahigh molecular weight polyethylene film 45 in the low friction rubber 13 is also a frame shape. Note that the ultrahigh molecular weight polyethylene film 45 may not cover the entire top surface of the convex portion 14. For example, a plurality of ultrahigh molecular weight polyethylene films are spaced apart from each other in the direction in which the ridge line of the convex portion 14 extends. 45 may be provided.

  Further, in a state where the door body 8 is closed, that is, in a state where the door body 8 and the door stop 15 are completely in contact with each other, the low friction rubber 13 surrounds the water discharge passage 5 as a whole (a four-way watertight state can be secured). If so, each portion of the low friction rubber 13 may be provided separately. For example, the upper low friction rubber 13a, the side low friction rubber 13b, and the lower low friction rubber 13c may be provided on the door body 8 side. Alternatively, the lower low friction rubber 13c may be provided on the door stop 15 side, and the upper low friction rubber 13a and the side low friction rubber 13b may be provided on the door body 8 side.

  The low friction rubber 13 is a so-called “P-type rubber”. The watertight rubber 12 in the low friction rubber 13 has a convex portion 14 fixed to a door stop 15 on one side. That is, the convex portion 14 is fixed on the door stop 15 by fixing the fixing portion 16 extending from the convex portion 14 to one side by the fixing member 19 such as a bolt. The top of the convex portion 14 is a curved surface, and the radius of curvature of the cross section of the top in the direction parallel to the width direction (short direction) and the thickness direction of the low friction rubber 13 is in contact with the door body 8. It is preferable that it is 15 mm or less in the state which is not. It is more preferable that the radius of curvature of the top of the convex portion 14 is 12 mm or less because the water tightness is further improved. In addition, the thickness of the fixing | fixed part 16 is about 25 mm, for example.

  Moreover, it is preferable that the ultra high molecular weight polyethylene film 45 has a film thickness of 0.1 mm or more and 1 mm or less. When the film thickness of the ultra high molecular weight polyethylene film 45 is less than 0.1 mm, the door body 8 is easily damaged by sand or the like, and when the film thickness of the ultra high molecular weight polyethylene film 45 exceeds 1 mm, the film is extremely high. The molecular weight polyethylene film 45 is easily peeled off from the watertight rubber 12.

  Furthermore, it is more preferable that the film thickness of the ultrahigh molecular weight polyethylene film 45 is larger than 0.25 mm. Thereby, when the door body 8 is slid, it becomes difficult for wrinkles to enter the ultrahigh molecular weight polyethylene film 45, and as a result, the ultrahigh molecular weight polyethylene film 45 can be made more difficult to break.

  In the high-pressure radial gate 7 having the above-described configuration, the skin plate 31 side of the door body 8 is rotated upward or downward by the hydraulic cylinder 41, thereby closing or opening the water discharge channel 5 according to the amount of stored water or the weather. The flow rate can also be adjusted.

-Effect of high-pressure gate-
According to the high-pressure radial gate 7 of the present embodiment, the low friction rubber 13 has a four-way watertight structure that surrounds the water discharge channel 5 when the water discharge channel 5 is closed, and thus is higher than a radial gate for rivers having a three-way watertight structure. Watertightness can be ensured. If the low-friction rubber 13 has a frame shape, each portion of the low-friction rubber 13 (particularly water-tight rubber) is not cut, so that higher water-tightness can be ensured.

  In the high-pressure radial gate 7 of the present embodiment, an ultrahigh molecular weight polyethylene film 45 is provided on the convex portion 14 of the watertight rubber 12. Since the ultra high molecular weight polyethylene film 45 is excellent in wear resistance and has self-lubricating properties, the ultra high molecular weight polyethylene film 45 is provided on the contact surface of the low friction rubber 13 with the door body 8. As a result, the frictional force when sliding the door body 8 can be greatly reduced. Therefore, in the high-pressure radial gate 7 of the present embodiment, the opening / closing device of the door body 8 can be downsized, and energy saving can also be achieved.

  When the skin plate 31 is made of a stainless steel plate, the sliding friction coefficient between the watertight rubber made of natural rubber and the skin plate 31 is 0.7 when wet, whereas the low friction rubber of the present embodiment. The sliding friction coefficient between 13 and the skin plate 31 decreases to about 0.1 in a wet state. Further, it has been found from the test results independently conducted by the inventors of the present application that the sliding friction coefficient between the low friction rubber 13 and the skin plate 31 decreases as the water pressure applied to the door body 8 increases.

  When the ultra-high molecular weight polyethylene film 45 is used, the above-mentioned effect can be obtained, but a very large pressure is applied to the door body 8 of the high-pressure gate as compared with the radial gate installed at the upper part of the river gate or the dam. Therefore, there is a risk that water leakage may occur due to a decrease in frictional force. Further, since the pressure applied to the water-tight rubber 12 is increased, when the door body 8 is opened and closed, the ultrahigh molecular weight polyethylene film 45 may be wrinkled or easily damaged, and long-term reliability may be lowered. Come. For this reason, there has been almost no example of using an ultrahigh molecular weight polyethylene film in a conventional high-pressure gate. Further, since the skin plate 31 of the radial gate is a curved surface having a circular cross section, it is difficult to apply an ultrahigh molecular weight polyethylene film on a watertight rubber having a shape corresponding to the curved surface without causing wrinkles or deflection.

  However, in the high-pressure radial gate 7 of the present embodiment, since the ultrahigh molecular weight polyethylene film 45 having a film thickness of 0.1 mm or more and 1 mm or less is provided on the watertight rubber 12, the ultrahigh molecular weight polyethylene film 45 is at least an actual film. It has durability enough to withstand use, and it is possible to reduce the possibility that the ultrahigh molecular weight polyethylene film 45 is broken and the force required for opening and closing the gate is rapidly increased.

  When the ultra high molecular weight polyethylene film 45 is thin, the corner portion is finely opened or closed during the transportation of the ultra high molecular weight polyethylene film 45 before the production of the low friction rubber 13 or after the high pressure radial gate 7 is installed. It is easy to get nails. If wrinkles enter the ultrahigh molecular weight polyethylene film 45, the water tightness of the low friction rubber 13 may be reduced.

  On the other hand, by making the film thickness of the ultrahigh molecular weight polyethylene film 45 larger than 0.25 mm, the ultrahigh molecular weight polyethylene film 45 can be provided on the watertight rubber 12 without causing wrinkles and the like. It is possible to effectively suppress wrinkles on the ultrahigh molecular weight polyethylene film 45 during opening and closing. For this reason, the water tightness of the low friction rubber 13 can be further improved.

  Furthermore, according to this configuration, the ultrahigh molecular weight polyethylene film 45 can be given sufficient strength, so that the ultrahigh molecular weight polyethylene film 45 can be more reliably prevented from being damaged, and the high-pressure radial gate 7 can be prevented from being damaged for a long time. Reliability can be improved.

  Moreover, the curvature radius of the contact part (and convex part 14) with the door body 8 or the door stop 15 in the low friction rubber 13 is 15 mm or less. When the door body 8 is pressed with the same pressure, the smaller the radius of curvature of the abutting portion can reduce the area of the abutting portion, so that the sealing pressure can be increased. Therefore, according to the above configuration, the seal pressure at the contact portion can be increased as compared with the case where the radius of curvature of the contact portion is greater than 15 mm. For this reason, according to the high-pressure radial gate 7 of the present embodiment, the gate can be closed without causing water leakage even under high water pressure.

  Moreover, since the radius of curvature of the contact portion (and the convex portion 14) of the low friction rubber 13 with the door body 8 or the door stop 15 is 12 mm or less, the water tightness can be further improved. Even when the molecular weight polyethylene film 45 is provided to reduce the frictional force when the door body 8 is opened and closed, it is possible to effectively suppress water leakage when the water discharge channel 5 is closed.

  Further, in the high-pressure radial gate 7 of the present embodiment, each portion of the low friction rubber 13 (upper low friction rubber 13a, side low friction rubber 13b, and lower low friction rubber 13c) is fixed only on one side of the convex portion 14. As a result, the convex portion 14 is somewhat displaceable. Therefore, according to this configuration, water tightness can be improved as compared with the case where the low friction rubber 13 is fixed on both sides of the convex portion 14.

  By having the above configuration, the high-pressure radial gate 7 of the present embodiment reduces the energy required to move the door body 8 while maintaining high water tightness when the water discharge channel 5 is closed, and downsizing the switchgear. Can also be achieved.

  If water leakage does not occur when the water discharge channel 5 is closed even if the water tightness is somewhat reduced, the door is fixed on the door stop 15 or the door body 8 (skin plate 31) on both sides of the convex portion 14. A so-called caisson type watertight rubber may be used.

-Test of low friction rubber-
Below, the effect confirmation test about the low friction rubber which the present inventors conducted is demonstrated.

<Friction coefficient comparison test>
The inventors of the present application slid the door body in the state where the subject rubber and the door body are in contact with each other in the presence of water, using a test apparatus that can reproduce the use conditions in an actual high-pressure gate. The force required for sliding the body (that is, the opening / closing force of the door body) was measured. Further, the sliding friction coefficient between the subject rubber and the door body was calculated from the measured opening / closing force. The initial pressing amount (the amount of deformation in the thickness direction of the subject rubber in the initial state) was 2 mm.

  As the specimen rubber, measurement was performed using the low-friction rubber 13 of the present embodiment shown in FIG. 5 and a water-tight rubber having the same shape as the low-friction rubber 13 and not provided with the ultrahigh molecular weight polyethylene film 45. It was. In the low friction rubber 13, the ultra high molecular weight polyethylene film 45 has a thickness of 0.25 mm, and the convex portion 14 has a curvature radius of 18 mm. The low friction rubber 13 and the water-tight rubber used here were commonly used in the subsequent tests.

FIG. 6 shows the results of this test. As shown in the figure, when the low friction rubber 13 is used, the sliding friction coefficient is about 1/5 and the water pressure is less than that when the watertight rubber is used under the condition that the water pressure is 0 (N / mm ² ). 1 (N / mm ² ) was confirmed to be about 1/6 to 1/5. Since the water pressure of 1 (N / mm ² ) corresponds to the water pressure at a water depth of 100 m, the force required for opening and closing the door body can be greatly reduced by using low friction rubber even in an actual high pressure gate. Conceivable.

The sliding friction coefficient between the watertight rubber and the door body under the condition that the water pressure is 0 (N / mm ² ) is almost the same as the value (0.7) described in “Technical Standard for Dam / Weir Facilities”. It was.

<Door sliding test>
Using the test apparatus used in the “coefficient of friction comparison test”, the door body was moved in the horizontal direction in a state where the door body and the subject rubber (the low friction rubber 13 or the watertight rubber) were in contact with each other. However, the water pressure was 1.0 (N / mm ² ). When sliding the door body, the low-friction rubber and the water-tight rubber in contact with the lip portion (inclined portion of the door body end portion) 94 of the door body were photographed to confirm the deformation behavior of both rubbers.

  FIG. 7A is a photographic view showing the vicinity of the lip portion 94 when watertight rubber is used as the subject rubber, and FIG. 7B is a lip portion 94 when low friction rubber 13 is used as the subject rubber. FIG.

  As shown in FIG. 7A, when the watertight rubber was used alone, it was confirmed that a large number of ridges 90 entered the watertight rubber when passing through the lip portion 94. On the other hand, as shown in FIG. 7B, no noticeable wrinkles were observed when the low friction rubber 13 was used. If water enters the water-tight rubber, the water-tightness may be reduced. However, if the low-friction rubber 13 is used, not only can the sliding friction coefficient with the door body be significantly reduced, but also the water-tightness is reduced due to the generation of water. Was thought to be suppressed.

  In addition, although the film thickness of the ultrahigh molecular weight polyethylene film 45 in the low friction rubber 13 used here is 0.25 mm, the film thickness of the ultrahigh molecular weight polyethylene film 45 is made larger than 0.25 mm, thereby reducing the low friction. It is considered that fine wrinkles can be prevented from entering the rubber 13 more reliably.

<Watertightness test>
Using the above-described test apparatus, the water stoppage by the subject rubber was confirmed in a state where the subject rubber provided on the watertight plate was in contact with the door body. The test rubber was set to have a pressing amount of 2 mm, 5 mm, 7 mm, and 10 mm, and in each case, the water pressure was changed from 0 (N / mm ² ) to 1 (N / mm ² ).

As a result, when watertight rubber is used, no leakage of water is observed in the range of 0 (N / mm ² ) to 1 (N / mm ² ) regardless of the pressing amount of 2 mm, 5 mm, 7 mm, and 10 mm. It was. On the other hand, when the low friction rubber 13 is used, the water pressure is 0 (N / mm ² ) to 0.1 (N / mm ² ) regardless of whether the pressing amount is 2 mm, 5 mm, 7 mm, or 10 mm. A small amount of water oozed out in the range. However, the amount of water that exudes decreased as the amount of pressing increased. It was confirmed that water leakage occurred mainly at the corners of the low friction rubber 13.

Although the low friction rubber 13 has the ultra high molecular weight polyethylene film 45 on the surface, the friction coefficient between the low friction rubber 13 and the door body can be greatly reduced, but the water tightness is considered to be slightly lowered. For this reason, water leakage was able to be significantly reduced over the perimeter of the low friction rubber 13 by making the curvature radius of the top part of the convex-shaped part 14 into 15 mm or less. Furthermore, water leakage over the entire circumference could be eliminated by setting the radius of curvature of the top of the convex portion 14 to 12 mm or less.

  FIG. 8A is a photograph showing the corner portion of the low friction rubber 13 when the film thickness of the ultrahigh molecular weight polyethylene film 45 is 0.25 mm, and FIG. It is a photograph figure which shows the corner part of the low friction rubber | gum 13 when a film thickness is 0.5 mm.

  As shown in FIG. 8A, in the corner portion of the low-friction rubber 13 used in this test, the ultrahigh molecular weight polyethylene film 45 has a fineness extending in the width direction (the direction from the inside to the outside of the corner portion). Nagisa 48 was seen. From this, it was estimated that this ridge 48 reduced the water tightness in the corner portion.

  Therefore, when the inventors of the present invention set the film thickness of the ultrahigh molecular weight polyethylene film 45 to 0.5 mm, no wrinkles occurred in the corner portion of the low friction rubber 13 as shown in FIG. From this result, by making the film thickness of the ultrahigh molecular weight polyethylene film 45 in the low friction rubber 13 larger than 0.25 mm, it is possible to suppress the generation of wrinkles at the corners and more reliably suppress the occurrence of water leakage. It was considered.

<Compression transfer test>
For the purpose of examining the wear state of the ultra-high molecular weight polyethylene film when the door body was repeatedly opened and closed, a test was performed in which the skin plate was slid with the low friction rubber 13 compressed. In this test, using a compression and movement tester, the skin plate was slid in the horizontal direction and the perpendicular direction to the assumed water flow direction with respect to the low friction rubber 13 having the shape shown in FIG. The change in the film thickness of the ultrahigh molecular weight polyethylene film 45 was examined. The total number of sliding of the skin plate was 25000 times corresponding to actual use for 10 years. The ultrahigh molecular weight polyethylene film 45 has a thickness of 0.25 mm.

  As a result, the amount of decrease in the film thickness of the ultrahigh molecular weight polyethylene film 45 after the compression movement test is about 1.6% of the entire film thickness, and the wear amount of the ultrahigh molecular weight polyethylene film 45 due to sliding is very small. It was confirmed. From this, it can be seen that the low friction rubber 13 has sufficient durability.

-Modification of the first embodiment-
FIG. 9 is a cross-sectional view showing the structure of a dam having a high-pressure radial gate according to a modification of the first embodiment. The high-pressure radial gate 61 shown in the figure is a tensile radial gate, and a trunnion pin 21 a that serves as a rotation shaft of the door body 62 is fixed upstream of the skin plate 64 in the water discharge channel 5. In the high-pressure radial gate 7 of the first embodiment shown in FIG. 1, the arc surface of the door body 8 (specifically, the skin plate 31) faces the upstream side when the water discharge channel 5 is closed. In such a high-pressure radial gate 61, the arc surface of the door body 62 (specifically, the skin plate 64) faces the downstream side.

  In the high-pressure radial gate 61 according to this modification, as in the high-pressure radial gate 7 of the first embodiment, a low-friction rubber (not shown) having a four-way water-tight structure is provided when the water discharge channel 5 is closed. An ultra high molecular weight polyethylene film is formed on one of the contact surface with the rubber door and the contact surface with the low friction rubber door body 62 (specifically, the skin plate 64). The film thickness of the ultrahigh molecular weight polyethylene film is preferably 0.1 mm or more and 1 mm or less, and if it exceeds 0.25 mm and 1 mm or less, generation of wrinkles can be prevented more effectively, and the ultrahigh molecular weight polyethylene film can be prevented. Is more preferable because it is difficult to cause peeling.

  In the high-pressure radial gate 61 of the present embodiment, the skin plate 64 is pressed by water pressure from the back side and pressed against the door. For this reason, when the door 62 is opened and closed, a very large pressure is applied not only to the skin plate 64 but also to the watertight rubber.

  However, in the high-pressure radial gate 61 according to this modification, the ultrahigh molecular weight polyethylene film is disposed on the watertight rubber, so that the frictional force between the low friction rubber and the door stop or the door body is greatly reduced, Even when the door stop or the skin plate 64 includes a curved portion, wrinkles are unlikely to occur in the ultrahigh molecular weight polyethylene film. In addition, the ultrahigh molecular weight polyethylene film is less likely to be damaged, and the ultrahigh molecular weight polyethylene film is less likely to be peeled off.

  Further, the water-tight rubber is so-called P-type, and the radius of curvature of the convex portion is 15 mm or less, so that the water at the time of closing the water discharge channel 5 can be greatly reduced while the frictional force when opening and closing the door body 62 is greatly reduced. Leakage can be effectively reduced.

(Second Embodiment)
FIG. 10 is a sectional view showing the structure of a dam having a high-voltage gate according to the second embodiment of the present invention. Moreover, Fig.11 (a), (b) is the top view which shows the structure of the high voltage | pressure roller gate which is a high voltage gate of this embodiment, and sectional drawing in the XIb-XIb line. In addition, the top view in the same figure is the figure which looked at the high voltage | pressure roller gate which is a main gate from the upstream (water discharge channel 5 side). In FIG. 11A, illustration of the fixing member 69 is omitted.

  As shown in FIGS. 10 and 11 (a) and 11 (b), a second high-pressure roller gate 63 may be provided as a main gate at the downstream opening end of the water discharge channel 5. The second high-pressure roller gate 63 includes a door (skin plate 71), rollers 67 provided on both sides of the opening of the water discharge channel 5, and upward from both sides of the opening of the water discharge channel 5. And a rail (not shown) that extends and slides the roller 67.

  The size of the door of the second high-pressure roller gate 63 is, for example, about 5 m to 10 m in length and about 5 m to 10 m in width, similarly to the high-pressure roller gate 9 on the upstream side that is a sub-gate.

  A winding wire or the like is connected to the upper portion of the door body in the second high-pressure roller gate 63, and when the water discharge channel 5 is opened from the closed state, the door body is used using a hoisting machine connected to the wire. Is moved upward. Moreover, when closing the water discharge channel 5, the door body is slid downward using the dead weight of the door body and brought into contact with the door stop.

  In the second high-pressure roller gate 63 of the present embodiment, for example, a low friction rubber 65 is provided on the back surface of the door body (skin plate 71). The low friction rubber 65 includes a water-tight rubber having a convex portion and an ultrahigh molecular weight polyethylene film provided on the convex portion of the water-tight rubber. Also with this configuration, the ultra high molecular weight polyethylene film is disposed on the watertight rubber, so that the frictional force between the low friction rubber and the door stop or the door body is greatly reduced.

  In particular, the film thickness of the ultra-high molecular weight polyethylene film is 0.1 mm or more and 1.0 mm or less, as in the above-described embodiment, etc., so that it can have sufficient durability for actual use, It can be made difficult to peel off from the watertight rubber. Furthermore, if the film thickness of the ultra-high molecular weight polyethylene film is more than 0.25 mm and 1.0 mm or less, it is possible to more effectively prevent the generation of wrinkles in addition to the above-described effects, resulting in more breakage. Therefore, long-term reliability as a high-voltage gate can be improved.

  Further, the convex portion of the water-tight rubber is fixed on the back surface of the door body by the fixing member 69 on one side, and the curvature radius of the convex portion is 15 mm or less, which occurs when the door body 62 is opened and closed. Water leakage at the time of closing the water discharge channel 5 can be effectively reduced while greatly reducing the frictional force.

  The high voltage gate according to the first embodiment described above, its modification, and the second embodiment is an example of the high voltage gate according to the present invention, and the size, shape, film thickness, material, etc. of each member. Can be appropriately changed without departing from the spirit of the present invention. Moreover, the number, size, etc. of the water discharge channel 5 can be variously changed. For example, in the second high-pressure roller gate 63 of the second embodiment, a part or the whole of the low friction rubber 65 having an ultrahigh molecular weight polyethylene film may be provided on the door stop side. Alternatively, in the high-pressure gate according to the first and second embodiments, the ultrahigh molecular weight polyethylene film does not cover the entire convex portion of the water-tight rubber, and covers only a part of the convex portion, thereby providing water tightness. May be improved.

  As described above, the high-pressure gate according to an embodiment of the present invention can be applied to a water storage facility such as a dam.

DESCRIPTION OF SYMBOLS 1 Dam body 3 Water 4 Emergency water discharge channel 5 Water discharge channel 6 Water filling valve 7, 61 High pressure radial gate 8, 62 Door body
9, 63 High pressure roller gate 10 Filling pipe 11 Space 12 Watertight rubber 13, 65 Low friction rubber 13a Upper low friction rubber 13b Side low friction rubber 13c Lower low friction rubber 14 Convex part 16 Fixing part 17 Air box 18 Side door Contact member 19, 69 Fixed member 20 Lower door contact member 21 Trunnion hub 21a Trunnion pin 21b Trunnion hub 22 Upper door stop member 23 Leg 25 Horizontal main beam 27 Side roller 29 Vertical auxiliary beam 31, 64 Skin plate 33 Upper beam 35 Lower Girder 41 Hydraulic cylinder
45 Ultra high molecular weight polyethylene film 48, 90 皺 63 Second high pressure roller gate 67 Roller 71 Skin plate 74 Water 94 Lip portion

Claims (6)

It is a high-pressure gate that is installed in the water discharge channel provided in the dam body and used as the main gate,
A door stop disposed in the water discharge channel or at the downstream opening end of the water discharge channel;
A door body that abuts the door stop and closes the water discharge passage, and that can move from the door stop and open the water discharge passage;
It is installed on the door stop side or the door body side, and comprises a low friction rubber that comes into contact with the door body or the door stop when the water discharge channel is closed,
The low friction rubber includes a watertight rubber having a convex portion fixed to the door stop or the door body on one side, and an ultrahigh molecular weight polyethylene film provided on at least the convex portion of the watertight rubber; Have a high pressure gate. The high voltage gate according to claim 1,
The ultrahigh molecular weight polyethylene film has a thickness of 0.1 mm to 1.0 mm. The high voltage gate according to claim 2,
The ultrahigh molecular weight polyethylene film has a film thickness exceeding 0.25 mm. In the high voltage gate according to any one of claims 1 to 3,
The high-pressure gate characterized in that a radius of curvature of a contact portion of the low friction rubber with the door body or the door stop is 15 mm or less. In the high voltage gate according to any one of claims 1 to 4,
The door body has a rotating shaft provided in the water discharge channel, a plate member having an arcuate longitudinal section, and a leg portion connecting the rotating shaft and the plate member, and from the door stop It is possible to open the water discharge channel by rotating,
The high-pressure gate, wherein the door stop and the door body are provided in the water discharge channel. In the high voltage gate according to any one of claims 1 to 4,
Rollers provided on both sides of the door body;
A rail that extends upward from both sides of the opening of the water discharge channel and slides the roller;
The high-pressure gate according to claim 1, wherein the door body is moved upward along the rail along the rail when the water discharge channel is opened.