JP5205146B2 - Blockage prevention device - Google Patents

Description

  The present invention relates to a clog prevention device, and more particularly to a clog prevention device for preventing clogging of a drain hole of a sabo dam.

  FIG. 14 is a side view of a sabo dam provided with the drainage hole regulating drainage blocking device disclosed in Patent Document 1, and FIG. 15 is an enlarged front view seen from the arrow XV shown in FIG.

  With reference to these drawings, the sabo dam 2 is formed with a drain hole 3 penetrating the sabo dam 2 in the horizontal direction. The clogging prevention device is installed on the upstream side of the sabo dam 2, and has an inner frame 63 extending from the vicinity of the drainage top end 61 to the drainage hole 3, and from the vicinity of the drainage top end 61 to the drainage hole 3. The outer frame 64 extends further downward by about 1 m, and the perforated pipe 67 is located inside the inner frame 63 and extends from the vicinity of the water passage top end 61 to the drain hole 3.

  The inner frame 63 is a vertically divided cylindrical lattice piece having a semicircular cross section, and is constituted by an arch-shaped groove steel 76 and a steel pipe 78. The outer frame 64 is a vertically-divided cylindrical lattice piece having a semicircular cross section, and is composed of an arch-shaped groove steel 66 and a steel pipe 68. The lattice spacing in the outer frame 64 is the same as that in the inner frame 63. It is set to be larger than the lattice spacing.

  The inner frame 63 secures a constant water channel from which the flowing water reaches the drain hole 3, and the outer frame 64 waters only small rocks, earth and sand, etc. that should flow out of the drain hole 3 by normal flowing water. In addition to being sent to the vicinity of the hole 3, the inner frame 63 is protected from impacts caused by driftwood, rocks and the like during a flood. Further, the perforated pipe 67 is for forcibly washing away clogged earth and sand when the water guide path formed by the inner frame 63 or the drain hole 3 is closed.

  FIG. 16: is a side view concerning the partial fracture | rupture which shows the example of installation to the sabo dam of the blockage | blocking prevention apparatus of the drainage hole for drainage sediment control disclosed by patent document 2. FIG.

  The blockage preventing apparatus shown in FIG. 16 is basically the same as that shown in FIG. 14, and the difference will be mainly described.

  Referring to the figure, the blocking prevention device shown in FIG. 16 includes an inner frame 63 formed in a fine lattice shape by a semicircular cross member 82 and a straight vertical member 81, a semicircular cross member 72 and a straight. And an outer frame 64 formed in a coarse lattice shape with a vertical member 71. The effect of the inner frame 63 and the outer frame 64 on preventing the drainage hole 3 from being blocked is the same as that of the blockage preventing device shown in FIG. 14, but the outer frame 64 has a sectional fan shape (center angle 180 °). The two vertical members to be positioned at 30 ° and 150 ° are omitted, and the remaining vertical members 71 are fixed to the horizontal member 72 at equal intervals. This is a difference from the blocking prevention device shown in FIG.

  17 is a cross-sectional view taken along the line XVII-XVII shown in FIG. 16, and shows the operation of the occlusion prevention device shown in FIG. (A) shows the state at the beginning of the water-reduction period when the sediment runoff is large, and (b) shows the state where functional recovery is performed by omitting a part of the longitudinal members.

  Referring to (a), a boulder wall is formed on the outer periphery of the outer frame 64 at a narrow portion of the outer frame 64 at the time of flooding, but earth and sand and boulders flow out at a wide portion of the outer frame 64. However, the boulder wall is formed in the narrow part of the vertical space, so the sediment outflow function is not so active. After that, the same phenomenon as described above continues for a while even when the water reduction period begins.

Next, referring to (b), when water reduction starts from the state of (a), the vertical member is removed, and sediment discharge starts from a wide interval. That is, the sediments that support the boulders c collapse, and when the boulders c are sucked, the sediments that support the adjacent boulders d collapse, and the boulders d are in the same state as the boulders c. By such an operation, the boulder wall formed in the outer frame 64 collapses, so that the sediment discharge function becomes active.
Japanese Utility Model Publication No. 60-62535 JP-A-9-310327

  In the conventional blockage prevention device as described above, since the members constituting the frame are made of steel, they are directly subjected to impacts caused by collisions such as earth and sand gravel during floods, and the amount of impact energy absorbed is small, and the frame is It was fragile.

  The present invention has been made to solve the above-described problems, and provides a blockage prevention device in which components are hard to break by increasing the amount of absorption of impact energy due to collision of sediments during floods. For the purpose.

In order to achieve the above object, the invention according to claim 1 is a clogging prevention device installed upstream of a drainage hole in order to prevent clogging of the drainage hole of the sabo dam. A vertical member and a horizontal member arranged in a lattice shape so as to cover the hole, and a shock absorber provided on at least a part of the outer surface of at least one of the vertical member and the horizontal member, at least a part of which is a steel chain The shock absorbing material includes an elastic body that embeds the steel chain in a loosened state, and at least one of the longitudinal member and the cross member adjacent to both sides of the steel chain has rigidity .

If comprised in this way, the impact by the collision of the earth and sand gravel etc. to a vertical material or a horizontal material will be transmitted to a vertical material or a horizontal material through a buffer material. In addition, due to the collision of earth and sand, the steel chain first extends together with the elastic body, and then a tensile force is transmitted to the steel chain. Furthermore, it is possible to reliably prevent passage of sand and gravel having a size larger than a certain size by a pair of rigid longitudinal members or cross members.

The invention according to claim 2 is a clogging prevention device installed on the upstream side of the drainage hole in order to prevent clogging of the drainage hole of the sabo dam, and is formed in a lattice shape so as to cover the drainage hole. with the placed longitudinal members and transverse members, at least one of at least a portion of the longitudinal member and transverse member are have a flexible, at least one of each of the longitudinal members and transverse members which are adjacent to both sides of at least a portion It has rigidity .

If comprised in this way, the part of the flexible vertical member or horizontal member will bend by collision of the earth and sand gravel etc. to a vertical member or a horizontal member. In addition, it is possible to reliably prevent passage of sand and gravel having a size larger than a certain size by a pair of longitudinal members or cross members having rigidity.

According to a third aspect of the present invention, in the configuration of the second aspect of the present invention, at least a part includes a steel chain and an elastic body in which the steel chain is embedded in a loosened state.

  When configured in this manner, due to the collision of earth and sand or the like, the longitudinal member or the transverse member including the steel chain and the elastic body is such that the steel chain first extends together with the elastic body, and then the tensile force is applied to the steel chain. Communicated.

According to a fourth aspect of the present invention, in the structure of the first aspect of the present invention, at least a part is detachably joined.

  If comprised in this way, it will become possible to change the member space | interval formed with at least one part vertical material or horizontal material.

According to a fifth aspect of the present invention, in the configuration of the invention according to any one of the first to fourth aspects, a part of the longitudinal member is detachably joined to the transverse member.

  If comprised in this way, it will become possible to remove a specific vertical member by canceling | releasing removal | desorption of the vertical member joined so that attachment or detachment is possible.

According to a sixth aspect of the invention, in the configuration of the invention according to any one of claims 1 to 5, a portion of the longitudinal member are those comprising adjusting means capable of extending the attachment distance between its ends.

  If comprised in this way, it will become possible to loosen the tension | tensile_strength state of the vertical member containing an adjustment means.

As described above, according to the first aspect of the present invention, the impact energy caused by the collision of the earth and sand gravel etc. is transmitted because the impact caused by the impact of the earth and sand gravel on the vertical material or the horizontal material is transmitted to the vertical material or the horizontal material through the buffer. The amount to absorb increases. In addition, the steel chain extends together with the elastic body due to the collision of earth and sand gravel, etc., and then the tensile force is transmitted to the steel chain, so that the amount of impact energy absorbed by the collision of earth and sand gravel further increases. . Furthermore, since the passage of sand and gravel of a certain size or larger can be reliably prevented by a pair of rigid vertical or horizontal members, the possibility of blocking drain holes is reduced and reliability is reduced. Will improve.

The invention according to claim 2 absorbs impact energy due to collision of earth and sand gravel and the like because a portion of flexible vertical and horizontal material is bent by collision of earth and sand and gravel on the vertical and horizontal members. The amount increases. In addition, it is possible to reliably prevent passage of sand and gravel with a certain size or larger by a pair of rigid vertical or horizontal members, reducing the possibility of clogging drain holes and increasing reliability. Will improve.

In addition to the effect of the invention described in claim 2, the invention described in claim 3 is such that the steel chain and the horizontal member including the steel chain and the elastic body are first formed by the steel chain due to collision of earth and sand. Since it extends together with the elastic body and then a tensile force is transmitted to the steel chain, the amount of impact energy absorbed by collision of earth and sand gravel further increases.

In addition to the effects of the invention according to any one of claims 1 to 3 , the invention described in claim 4 can change the interval between members formed by at least a part of vertical members or cross members. Therefore, it becomes possible to adjust the size of the passing gravel by detaching the members.

In addition to the effects of the invention according to any one of claims 1 to 4 , the invention described in claim 5 removes a specific longitudinal member by releasing the removal of the longitudinal member joined in a detachable manner. Therefore, it becomes easy to replace a specific longitudinal member.

In addition to the effect of the invention according to any one of claims 1 to 5 , the invention according to claim 6 can loosen the tension state of the vertical member including the adjusting means. Quick removal work such as trapped driftwood becomes possible.

  FIG. 1 is a side view of a blockage preventing device according to a first embodiment of the present invention installed on a sabo dam.

  Referring to the figure, a sabo dam 2 having a trapezoidal side surface includes a drain hole 3 formed horizontally in the direction of water flow. And the blocking | blocking prevention apparatus 1 is installed in the upstream of the drain hole 3 so that the drain hole 3 may be covered. The blockage preventing device 1 prevents the drainage hole 3 from being blocked due to outflow of sediments and the like during a flood.

  2 is an enlarged view of a portion X shown in FIG. 1, FIG. 3 is a sectional view taken along line III-III shown in FIG. 2, and FIG. 4 is an enlarged sectional view taken along line IV-IV shown in FIG.

  Referring to these drawings, the blocking prevention device 1 includes an elastic bar 5 and shackle 22 and turnbuckle 11, which are vertical members, elastic bars 6a and 6b, steel pipes 7a and 7b, and a steel base 8a which is a horizontal member. ˜8c, 12 are arranged mainly in a grid pattern. The structures of the elastic bars 5, 6a, 6b and the turnbuckle 11 will be described later.

  One end of each of the plurality of elastic bars 5 is connected to the shackle 21 on the gantry 12 installed on the sabo dam 2 by anchors 31a, 31b, 31c (not shown) and 31d (not shown) at the top. The turnbuckle 11 and the shackle 22 are joined to each other, and the other end is located at the lower part of the gantry 12 and is controlled by anchors 32a, 32b, 32c (not shown) and 32d (not shown). 2 is joined to the gantry 8a having a semi-cylindrical cross section through the shackle 23 so that the joining intervals are substantially equal. Therefore, the plurality of elastic bars 5, the shackle 22 and the turnbuckle 11 are formed in a fan shape.

  Below the gantry 8a, a gantry 8b having the same shape as the gantry 8a is installed in the sabo dam 2 by anchors 33a, 33b, 33c, 33d (not shown). Further, below the gantry 8b, a gantry 8c having the same shape as the gantry 8a is installed on the sabo dam 2 by anchors 34a, 34b, 34c (not shown) and 34d (not shown).

  The elastic bar 6a and the steel pipe 7a are joined to the gantry 8a so that one end of each of the elastic bar 6a and the steel pipe 7a is alternately semicircular. The other end of the elastic bar 6a passes through the mount 8b and is joined to one end of the elastic bar 6b via a shackle 25 (not shown). The other end of the elastic bar 6b is one end of the elastic bar 6a. It is joined to the mount 8c in the same manner as described above. Further, like the elastic bars 6a and 6b, one end of the steel pipe 7a is joined to the gantry 8a and the other end is joined to the gantry 8b by bolts 44a to 44d, etc. Details of each joining method will be described later. To do.

  FIG. 5 is a partially broken perspective view showing a schematic configuration of each elastic bar shown in FIG.

  Referring to the drawing, the elastic bar 5 is composed of a steel chain 42 in a relaxed state and an elastic body 41 such as rubber formed so as to be embedded therein. Therefore, the elastic body 41 is also filled in the gap 15 between the chains. As a result, the elastic bar 5 becomes a structure having flexibility and an absorption energy larger than the absorption energy of the chain 42 alone that does not include the elastic body 41. In addition, since the elastic body 41 serves as a cushioning material for the chain 42 and dirt and gravel do not directly collide with the chain 42, the durability of the chain 42 is improved and it is difficult to break.

  FIG. 6 is a diagram showing the relationship between the displacement and the load for explaining the phenomenon of increase in the absorption energy of the elastic bar shown in FIG. 2, wherein (1) is based only on the steel chain, and (2) is the elasticity. It is by the elastic bar which combined the body and the steel chain.

  Referring to the figure, the vertical axis represents the load F, and the horizontal axis represents the displacement L. The rupture load X is shown on the vertical axis, and when a load greater than or equal to the rupture load X acts on the steel chain, the steel chain breaks and breaks.

  Referring to (1), in the case of only a steel chain, the amount of energy absorbed until the breaking load X is applied corresponds to the hatched area Sa.

  Next, referring to (2), in the case of an elastic bar that is a combination of an elastic body and a steel chain, when a load is applied, the steel chain is configured to be loose at the initial stage. And the steel chain will extend first. When a further load is applied, the steel chain is in tension and reaches the breaking load X. That is, the amount of energy absorbed until the elastic bar breaking load X is applied corresponds to the hatched area Sb. Comparing Sa and Sb, it can be seen that the amount of energy absorbed by the elastic bar is significantly greater than the amount of energy absorbed by the steel chain alone. This increase in the amount of absorbed energy is in the blockage prevention apparatus 1 shown in FIG. 1, leading to an increase in the amount of absorbed impact energy due to collision of earth and sand. That is, it becomes a structural member which is hard to break.

  FIG. 7 is an enlarged view of a portion A shown in FIG.

  Referring to the figure, the eyebolt 48 is joined by a nut 49 and a washer 50 through an opening 52 formed in the gantry 8a. The shackle 24 is connected to the eyebolt 48, and the shackle 24 is connected to the chain 42 in the elastic bar 6a. The shackle 24 makes the elastic bar 6a and the gantry 8a detachable. The elastic bar 6a is removable because both ends are connected by shackles. Therefore, it is easy to replace the members of the elastic bar 6a.

  Further, when a driftwood or the like is captured during a flood, the lattice spacing is widened by removing the elastic bar 6a, so that the driftwood or the like can be easily and reliably removed.

  FIG. 8 is an enlarged view of a portion B shown in FIG.

  Referring to the drawing, both ends of steel pipe 7a are formed in a flange shape, and flange portion 57 and gantry 8a are joined. The flange portion 57 and the gantry 8a are joined by engaging a bolt 44a and a nut 45a through an opening 53a formed in the gantry 8a and an opening 54a formed in the flange portion 57, and the bolt 44a. Washers 46a and 47a are interposed in the nut 45a. The same configuration as this is formed at the four corners of the flange portion 57. Therefore, the steel pipe 7a and the gantry 8a are detachable. Moreover, since the both ends of the steel pipe 7a are joined by the structure shown in the figure, it can be removed. Therefore, member replacement of the steel pipe 7a is facilitated.

  Similarly to the elastic bar 6a shown in FIG. 7, when driftwood is captured during a flood, the steel pipe 7a is removed to widen the lattice spacing, so that driftwood can be easily and reliably removed. is there.

  FIG. 9 is a diagram illustrating a state in which the occlusion prevention device illustrated in FIG. 1 has captured driftwood and the like, and FIG. 10 is a diagram illustrating a state in which the driftwood and the like captured in the occlusion prevention device illustrated in FIG.

  First, the removal of the driftwood 20a captured by the elastic bars 5a and 5b will be described.

  Referring to FIG. 9, when the driftwood 20 a collides with the blockage preventing device 1 due to flooding and is sandwiched between the elastic bars 5 a and 5 b, the flexible steel chain and the elastic body in the elastic bars 5 a and 5 b Due to the effect, the elastic bars 5a and 5b are bent, and the driftwood 20a is captured in a state where the distance between them is increased.

  In this state, the elastic bars 5a and 5b are in a tension state, and it is not easy to remove the driftwood 20a, but the driftwood 20a can be removed as described below.

  Referring to FIG. 10, a turnbuckle 11 is connected to the elastic bar 5a at the upper portion thereof, and the turnbuckle 11 serves as an adjusting means, and the vertical member including the elastic bar 5a extends from the gantry 12 to the gantry 8a. It is possible to extend the mounting distance between them. By extending the attachment distance, it is possible to increase the bending of the elastic bar 5a and loosen the tension state of the longitudinal member. Therefore, since the gap 16a is formed by bending the elastic bar 5a in the direction of the arrow in the figure, it is possible to remove the driftwood 20a more quickly than the removal of the driftwood 20a by removing the vertical member described above.

  Next, the removal of the driftwood 20b captured by the elastic bar 6a and the steel pipe 7a will be described.

  Referring to FIG. 9, when driftwood 20b collides with blockage preventing device 1 due to flooding and is sandwiched between elastic bar 6a and steel pipe 7a, the flexible steel chain and elastic body in elastic bar 6a The elastic bar 6a is bent by the effect, and the driftwood 20b is captured in a state where the interval between them is widened.

  In this case, since there is no adjusting means like the turnbuckle 11, the tension state of the elastic bar 6a cannot be loosened. Therefore, the driftwood 20a can be removed as described below.

  Referring to FIG. 10, one end of elastic bar 6 a is joined to gantry 8 a via shackle 24 at the top. Since it is joining via the shackle 24, the elastic bar 6a and the gantry 8a are joined detachably. When the joining of the elastic bar 6a and the gantry 8a is released, the other end of the elastic bar 6a is joined to the elastic bar 6b via the shackle 25 (not shown), so that the shackle 25 (not shown) is centered. It becomes free to play as. Therefore, since the clearance 16b is formed when the elastic bar 6a is moved in the direction of the arrow in the figure, it is possible to remove the driftwood 20b more quickly than the removal of the driftwood 20b by removing the vertical member described above.

  As described above, the elastic bars 6b and the steel pipes 7b and 7d are alternately arranged. Therefore, the vertical members adjacent to both sides of the elastic bar 6b are the steel pipes 7b and 7d and have rigidity. The elastic bar 6b has elasticity (flexibility). For example, when a slightly larger earth and sand gravel passes between the steel pipe 7b and the elastic bar 6b, the elastic bar 6b bends. This earth and sand gravel passes through the blocking prevention device 1. Here, paying attention to the steel pipes 7b and 7d, these are members having rigidity, and are members which are not easily deformed by collision of earth and sand gravel. Therefore, since the vertical members adjacent to both sides of the elastic bar 6b are the rigid steel pipes 7b and 7d, the passage of sand and gravel having a size larger than that between the steel pipes 7b and 7d is reliably prevented. And since the space | interval below the magnitude | size of the drain hole is set between the steel pipes 7b and 7d, the earth and sand gravel, driftwood, etc. larger than the drain hole do not pass the obstruction | occlusion prevention apparatus 1. FIG. Therefore, the possibility of blocking the drain hole is reduced, and the reliability of the blocking prevention device 1 is improved. Furthermore, in the earth and sand gravel that can pass through the drain hole, the elastic bar 6b passes through the blocking prevention device 1 by bending, so that sedimentation of sand and gravel on the front surface of the blocking prevention device 1 can be prevented. . The effects as described above are the same for the elastic bar 6a and the steel pipes 7a and 7c.

  FIG. 11 is a cross-sectional view of the blocking prevention device according to the second embodiment of the present invention, corresponding to FIG. 3 of the first embodiment, and FIG. 12 is the blocking prevention shown in FIG. It is sectional drawing of an apparatus, Comprising: It corresponds to FIG. 4 of 1st Embodiment.

  Since the description is basically the same as that of the first embodiment, the difference will be mainly described.

  With reference to these drawings, in this embodiment, the member configuration of the longitudinal member is different. That is, the steel pipes 7a, 7c and the elastic bars 6a, 6c, 6e provided between the gantry 8a, 8b are not alternately arranged, and the elastic bars 6a, 6c, 6e are not arranged between the steel pipes 7a, 7c. Is arranged. Therefore, the cross members adjacent to both sides of the elastic bars 6a, 6c, and 6e are the steel pipes 7a and 7c, and have rigidity. As in the first embodiment, the distance between the steel pipes 7a and 7c is set to be equal to or smaller than the size of the drain hole. The vertical member provided between the gantry 8b and 8c has the same configuration as described above.

  The effect of such a blocking prevention device 1 will be described.

  FIG. 13 is a view in which a part of the elastic bar in the blockage preventing apparatus shown in FIG. 11 is removed, and corresponds to FIG.

  With reference to a figure, the vertical member between the mounts 8a and 8b is demonstrated first. In this figure, the state which removed the elastic bar 6c is shown. By removing the elastic bar 6c, the minimum interval x1 between the elastic bars 6a, 6c, 6e before the removal is changed to the interval x2 between the elastic bars 6a, 6e. Further, by removing the elastic bar 6b which is a vertical member between the gantry 8b and 8c, the minimum interval y1 between the steel pipe 7b and the elastic bar 6b before the removal is changed to the interval y2 between the steel pipe 7b and the elastic bar 6d. Will do. Thus, it becomes possible to change the member space | interval of a vertical member by removal | desorption of elastic bar 6a-6f. Accordingly, it is possible to adjust the size of earth and sand gravel that passes through the blocking prevention device 1.

  In each of the above embodiments, the vertical member and the cross member have a specific shape as a lattice shape, but may be formed in another lattice shape by the vertical member and the cross member.

  In each of the above embodiments, an elastic bar composed of a steel chain as a vertical member and an elastic body in which the steel chain is loosened is used. Alternatively, a cord-like material having no flexibility may be used as a vertical member, and a simple cylindrical cushioning material or the like may be provided on the outer surface. Or even if there is no thing equivalent to a buffer material, it may have only flexibility. Note that the flexibility in this specification does not include the property of a member that is slightly bent by its own weight, such as a steel pipe.

  Furthermore, in each said embodiment, although the elastic bar is used in the specific location, you may be used for at least one part of at least one of a vertical member and a cross member.

  Further, in each of the above embodiments, the vertical member and the cross member are joined by the shackle or the bolt and the nut, but any member that can be detachably joined may be used.

  Further, in each of the above-described embodiments, the longitudinal member adjacent to both sides of the elastic bar is a rigid steel pipe, but the longitudinal member adjacent to both sides of the flexible portion of at least one of the longitudinal member and the transverse member. And at least one of the cross members may have rigidity.

  Further, in each of the above embodiments, the elastic bar is detachably joined, but the elastic bar may not be detachably joined.

  Furthermore, in each of the above embodiments, all of the vertical members are detachably joined to the cross member, but a part of the vertical member may be detachably joined to the cross member. Alternatively, all of the vertical members may not be detachably joined.

  Further, in each of the above-described embodiments, the turnbuckle 11 is used as a means for adjusting the attachment distance of the vertical member, but other means may be used as long as the attachment distance of the vertical member can be adjusted. Or it may not be.

  Furthermore, in each said embodiment, although the turnbuckle 11 is installed in the specific vertical member, you may install in the other vertical member.

It is the side view which installed the blockade prevention device by a 1st embodiment of this invention in a sabo dam. It is an enlarged view of the X section shown in FIG. It is sectional drawing of the III-III line shown in FIG. It is an expanded sectional view of the IV-IV line shown in FIG. It is a partially broken perspective view which shows schematic structure of the elastic bar shown in FIG. It is a figure which shows the relationship between the displacement and load for demonstrating the increase phenomenon of the absorbed energy of the elastic bar shown in FIG. It is an enlarged view of the A section shown in FIG. It is an enlarged view of the B section shown in FIG. It is a figure which shows the state which the occlusion prevention apparatus shown in FIG. 1 capture | acquired driftwood etc. FIG. 10 is a diagram corresponding to the diagram of FIG. 9 and showing a state where captured driftwood and the like are removed. It is sectional drawing of the obstruction | occlusion prevention apparatus by 2nd Embodiment of this invention. It is sectional drawing of the obstruction | occlusion prevention apparatus shown in FIG. It is the figure which removed the elastic bar in the obstruction | occlusion prevention apparatus shown in FIG. It is a side view of the sabo dam which installed the blockage | prevention prevention apparatus of the drainage hole for the conventional runoff sediment control. It is the enlarged front view seen from the arrow XV shown in FIG. It is a side view concerning the partial fracture which shows the example of installation to the sabo dam of the blockade prevention device of the other drainage hole for conventional outflow sediment control. It is a cross section of the XVII-XVII line shown in FIG. 16, and is a figure which shows the action | operation of the other conventional obstruction | occlusion prevention apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blocking prevention apparatus 2 Sabo dam 3 Drain hole 5, 6 Elastic bar 7 Steel pipe 8, 12 Mount 11 Turnbuckle 20 Driftwood 21, 22, 23, 24, 25 Shackle 41 Elastic body 42 Chain 44 Bolt 45, 49 Nut 48 Eye bolt In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (6)

In order to prevent blockage of the drainage hole of the sabo dam, a blockage prevention device installed upstream of the drainage hole,
Vertical members and cross members arranged in a lattice shape so as to cover the drain holes,
A cushioning material provided on at least a part of the outer surface of at least one of the longitudinal member and the transverse member ,
The at least part includes a steel chain, and the cushioning material includes an elastic body that embeds the steel chain in a loosened state;
The at least one of the longitudinal member and the cross member adjacent to both sides of the at least part has rigidity . In order to prevent blockage of the drainage hole of the sabo dam, a blockage prevention device installed upstream of the drainage hole,
A vertical member and a horizontal member arranged in a lattice shape so as to cover the drain hole,
Wherein at least one of at least a portion of the longitudinal member and said transverse member is have a flexible,
The at least one of the longitudinal member and the cross member adjacent to both sides of the at least part has rigidity . The blockage preventing device according to claim 2, wherein the at least part includes a steel chain and an elastic body that embeds the steel chain in a loosened state. The blockage prevention device according to any one of claims 1 to 3, wherein the at least part is detachably joined. The blockage preventing device according to any one of claims 1 to 4 , wherein a part of the longitudinal member is detachably joined to the transverse member. The blockage preventing device according to any one of claims 1 to 5 , wherein a part of the longitudinal member includes an adjusting unit capable of extending a mounting distance between both ends thereof.

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