JP2008202291A - Permeable check dam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permeable check dam which dispenses with large-scale facilities, and has both a high permeable function exerted in normal times, i.e. without the concern of a flood, and a high debris catching function exerted during a flood. <P>SOLUTION: The permeable check dam 10 is formed of a lattice-shaped wall 16A and a gap forming members 18 arranged in upper areas of the lattice-shaped wall except for a lowermost area 24 of the same. The lowermost area 24 is openable/closable by an opening/closing member 30 which has a shape capable of blocking gaps of the lowermost area 24, and is switched to a closing location for blocking the gaps during a flood, for instance, while switched to an opening location for opening the gaps in normal times, for instance. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a transmission-type sabo dam for capturing earth and sand that rapidly flows out in a mountain stream or a stream in a mountainous area.

  In general, many sabo dams are installed as a means to prevent the devastation of mountainous areas due to a sudden outflow of sediment and the deterioration of the water storage function due to stagnant sand. This sabo dam is also expected to be installed in order to protect private houses, facilities, roads, etc. from damage from debris flows caused by heavy rain such as rainy season and typhoon.

  In recent years, a transmission type sabo dam has been developed as such a sabo dam. This transmission type sabo dam allows small gravel and mud flowing in the normal state to pass downstream, while capturing gravel and driftwood (hereinafter referred to as “bulb” etc.) that flow down when debris flow occurs, and damage downstream. For example, it is possible to maintain a more stable gravel function than an impervious sabo dam composed of concrete walls. Specifically, the impervious sabo dams dam up fine gravel and earth and sand (hereinafter referred to as “fine gravel etc.”), so at least two to three years after completion of the dam While the function as a sabo dam is often lost due to the accumulation of gravel, etc., the transmission type sabo dam avoids the rapid sedimentation of the sediment due to its transmission function, thereby generating an important debris flow. It is possible to maintain the dam function until time.

As such a transmission type sabo dam, Patent Document 1 discloses one having a grid-like wall. This grid-like wall is a combination of a vertical bar-shaped member made of steel pipe and a horizontal bar-shaped member. It is installed in a water channel, and captures boulders that are larger than the grid of the grid when debris flow occurs. On the other hand, during normal use, it allows permeation of medium pebbles and fine pebbles smaller than the lattice.
JP-A-7-82725

  The transmission-type sabo dam described in Patent Document 1 has a problem that it is difficult to capture fine gravel and sediment (hereinafter referred to as “fine gravel”) included in the initial flow of flood preceding the debris flow. is there. In general, at the beginning of the flood, the pebbles and the like are contained in the muddy water and reach the transmission type sabo dam, and then the debris flow reaches the transmission type sabo dam and the boulders and the like contained in the debris flow are transmission type. Captured at the bottom of the sabo dam. Since the lowermost gap is set to be large so as to allow the passage of the mud flow in the normal time as described above, the gap is also allowed to pass the fine gravel contained in the flow in the early stage of the flood. Resulting in.

  The fine pebbles and the like may interfere with the normal flow of the water channel by being accumulated or flooded on the downstream side after passing through the transmission type sabo dam. As means for avoiding such inconvenience, the passage cross section on the downstream side of the transmission type sabo dam is prevented in order to prevent the accumulation of pebbles, and a large sand basin for receiving the pebbles is passed through the permeation. Although measures such as providing downstream of the sabo dam can be considered, each measure requires special construction and space downstream of the transmission sabo dam.

  In addition, when the gap at the bottom is set small so that the bottom of the transmission type sabo dam can capture the fine gravel, etc., the transmission decreases, so that the transmission type at normal time without flooding. There is a risk of sedimentation on the sabo dam.

  In view of such circumstances, an object of the present invention is to provide a transmission type sabo dam that has both a high permeation function in a normal state without a flood and a high gravel capture function in a flood without requiring a large facility. And

  As a means for solving the above-mentioned problems, the present invention is a transmission type sabo dam installed in a waterway having a specific width, and is erected so as to cross the waterway in the width direction in the waterway. A lattice-shaped wall having a plurality of rod-shaped members combined so as to cross each other vertically and laterally, and a shape capable of locally closing the lowermost portion of the gap formed by the lattice-shaped wall, An opening / closing member capable of switching between a closed position for closing the gap and an open position for opening the gap is provided.

  With this transmission type sabo dam, it is possible to achieve both a sufficient transmission function during normal times and an improvement in gravel capture function during floods by only partial opening and closing of the grid-like walls by the opening and closing members. For example, in normal times when there is no flood, the opening and closing members are switched to the open position to open the lower part of the gap formed by the lattice wall, so that muddy water and the like can pass smoothly through the opened gap. it can. On the other hand, when a flood occurs, the opening and closing member is switched to the closed position from the beginning to close the lowermost part of the gap, so that gravel and the like reaching the transmission type sabo dam before the debris flow can be captured. it can. It is the same as before that boulders and medium pebbles contained in the subsequent debris flow are also captured by the lattice wall.

  Since the opening / closing member only needs to open and close only the lowermost portion of the gap formed by the grid-like wall, no large-scale equipment is required, and a large space is not required for the installation. In addition, since the boulders and the small and medium gravel are captured by the lattice wall and the gap forming member as in the prior art, the strength burden on the opening / closing member is small. Therefore, compared with a gate type that opens and closes the entire dam, for example, a simple and small facility for opening and closing is sufficient.

  Here, the said lowest part means the part which exists in the height area | region from the bottom face of the said water channel to predetermined height, The predetermined height is arbitrarily set according to a specification. More preferably, the gap portion where the opening and closing member opens and closes from the height position of the bottom surface of the water channel to a height position equal to or lower than the height position of the lowermost horizontal rod-shaped member of the rod-shaped members. Good part. It is very effective for the clogging and the like to be captured that the opening / closing member closes such a portion, that is, a portion where no horizontal bar-like member exists.

  In the present invention, a gap forming member that is provided in a region above the region that is opened and closed by the opening and closing member in the lattice wall and that forms a gap smaller than the maximum dimension of the lattice of the lattice wall. It is more preferable to comprise. This gap forming member enables trapping of small and medium pebbles smaller than boulders or the like that can be captured by the lattice wall.

  As this gap forming member, for example, a member including at least one of a ring net, an expanded metal, a plurality of H-shaped steels arranged in parallel to each other, and a steel plate in which a large number of through holes are formed is suitable.

  The opening / closing member is installed so as to be rotatable around an axis extending in the width direction at a bottom portion of the water channel or in the vicinity thereof, and by the rotation, the closed position where the body falls along the bottom portion of the water channel and the It may be switched to a closed position standing up from the bottom of the water channel, and may be rotated around an axis extending in the vertical direction at the positions at or near both ends of the lattice wall in the width direction. There may be a pair of left and right door members provided, and these door members may be switched between a closed position intersecting the flow direction of the water channel and an open position along the flow direction by rotation thereof. . In any case, the opening / closing member can be switched between the open position and the closed position with a simple structure that only rotates around a predetermined axis, and in the open position, the opening and closing member can be smoothly moved at the bottom. Does not impede current flow.

  In the present invention, it is more preferable to further include an opening / closing device that moves the opening / closing member between a closed position and an open position. The provision of this opening and closing device significantly reduces the burden of opening and closing the opening and closing member by the operator. In addition, as described above, the opening / closing member may be small and does not require a large driving force to open and close, so the opening / closing device should be covered with a relatively simple and small facility such as one using air pressure. Is possible.

  More preferably, the opening / closing device holds the opening / closing member in the closed position by pressing the opening / closing member against the lattice wall. In this configuration, the closed position of the opening / closing member can be stabilized using an existing grid-like wall.

  Further, in the case of providing a lock mechanism that locks the opening / closing member in the closed position by detachably coupling the opening / closing member switched to the closed position to the lattice wall, the opening / closing member is more reliably closed. It is possible to maintain the position.

  The lattice wall may be singular, but may be juxtaposed in a plurality of stages in the flow direction of the water channel. In this way, in the case of having a plurality of grid walls, the opening and closing member is provided on the downstream side of the grid wall on the most upstream side, and the grid shape on the downstream side of the grid wall on the most upstream side. It is preferable that the opening / closing member is held at the closed position by pressing the opening / closing member against the wall from the upstream side. In such an arrangement, the flow pressure acts on the opening / closing member in the closed position in a direction in which the opening / closing member is further pressed against the lattice-like wall, thereby further maintaining the closed position of the opening / closing member. to be certain. Further, since the pressure is supported by the lattice wall against which the opening / closing member is pressed, the load of the opening / closing device for holding the closed position is further reduced. Further, the opening / closing member itself is effectively protected from boulders and the like by a lattice-like wall installed upstream of the opening / closing member.

  As described above, according to the present invention, it is a simple facility only having an opening / closing member that locally opens and closes a gap formed by the lowermost portion of the gaps formed by the grid-like wall, and is usually free from floods. A high permeation function at the time and a high gravel capture function at the time of flooding can be achieved.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  1 to 4 show an overall structure of a transmission type sabo dam 10 according to a first embodiment of the present invention. The transmission type sabo dam 10 is installed in a water channel 14 that is recessed at the top of a dam 12 made of concrete, for example. A bottom wall 13 is driven under the water channel 14, and the transmission type sabo dam 10 is erected on the bottom wall 13.

  The transmission type sabo dam 10 includes an upstream lattice wall 16A and a downstream lattice wall 16B juxtaposed in the flow direction of the water channel 14, and a gap forming member 18 provided on the upstream lattice wall 16A. Prepare.

  Each of the lattice-like walls 16A and 16B is erected in the water channel 14 so as to cross the water channel in the width direction thereof, and includes a plurality of support columns 20 that are vertical bar-shaped members, and a horizontal direction. The plurality of connecting rods 22 are rod-shaped members, and these are combined in a lattice shape. The respective columns 20 are erected so as to be arranged in the width direction orthogonal to the flow direction of the water channel 14 at intervals, and the lower ends thereof are embedded in the bottom wall 13. The connecting rod 22 connects the struts 20 in the width direction. In this embodiment, the connecting rod 22 is disposed so as to cross the upper end portion and the intermediate portion of the struts 20 in the width direction. . Therefore, in the lattice-like walls 16A and 16B according to this embodiment, a pair of upper and lower lattices are formed between the columns 20 adjacent to each other.

  The gap forming member 18 is provided in a region above the upstream side lattice-like wall 16A except the lowermost portion 24, and has a gap smaller than the maximum dimension of the lattice of the lattice-like wall 16A. Form. Here, the lowermost portion 24 means a portion existing in a height region from the upper surface of the bottom wall 13 to a predetermined height, and the predetermined height is arbitrarily set according to specifications. More preferably, from the height position of the bottom surface of the water channel 14 (that is, the height position of the upper surface of the bottom wall 13), the height of the lowermost connection rod 22 among the connection rods 22 that are horizontal rod-shaped members. It is good that it is a part to the height position below the height position.

  The gap forming member 18 according to this embodiment is composed of a plurality of crosspieces 26 arranged side by side at an interval in the vertical direction. The crosspieces 26 are joined to the columns 20 by welding or the like so as to cross the columns 20 in a posture extending in the width direction of the water channel 14. The presence of the gap forming member 18 reduces the gap in the arrangement region. In other words, a large gap is left locally only in the lowermost portion 24 where the gap forming member 18 does not exist in the upstream lattice wall 16A.

  The size of each gap can be appropriately set based on the gravel capturing function and the transmittance required for the transmission-type sabo dam 10. In general, the size of the gap formed by the lowermost portion 24 is a size that prevents passage of boulders contained in the debris flow described later but allows passage of medium pebbles (usually below the wave height of the debris flow or maximum gravel). It is set to a dimension that is not more than twice the diameter; for example, 1000 mm. The size of the gap formed by the gap forming member 18 is set to a size (for example, 300 mm) that prevents the passage of the medium pebbles but allows the passage of smaller pebbles (fine gravel or earth and sand). Is set.

  The gap forming member 18 may also be provided on the downstream lattice wall 16B. Further, when there is a single grid wall, the gap forming member may be provided on the grid wall. Alternatively, the gap forming member itself may be omitted as will be described later.

  The illustrated transmission-type sabo dam 10 includes appropriate reinforcing materials in addition to the lattice-like walls 16A and 16B and the gap forming member 18. This reinforcing material includes a rod-shaped connecting member 27 that connects the upstream lattice-like wall 16A and the downstream lattice-like wall 16B in the front-rear direction, and a rod-like member that further supports the downstream lattice-like wall 16B from the downstream side. The diagonal material 28 etc. are included.

  Further, the transmission type sabo dam 10 is characterized by a pair of left and right opening / closing members 30 for opening and closing a gap formed by the lowermost portion 24 among the gaps formed by the upstream lattice wall 16A, And an opening / closing device 32 for opening and closing the member 30.

  Each opening / closing member 30 is made of a plate material in this embodiment, and has a front shape capable of locally closing only the gap formed by the lowermost portion 24. The size does not necessarily have to be a size that covers all the gaps formed by the lowermost portion 24, and may be any size as long as it closes the gaps as shown in the figure. The degree of blockage is set according to the diameter of the gravel that needs to be captured.

  Each of the open / close members 30 is closed to stand so as to close the gap formed by the lowermost portion 24 as shown in FIGS. 3 and 4, and opens the gap as shown in FIGS. Thus, it is installed so as to be able to undulate between the open position where it lies down, and is stored in the bottom wall 13 at the open position. Specifically, a recess 34 as shown in FIGS. 5 (a) and 5 (b) is provided at a position immediately downstream of the upstream lattice wall 16 A in the upper part of the bottom wall 13. A support shaft 36 extending in the width direction of the water channel 14 is provided, and the opening / closing member 30 is installed so as to be rotatable about the support shaft 36. As shown in FIG. 5A, the open position of the opening / closing member 30 is a position where the open / close member 30 is laid down so as to be accommodated in the recess 34, and the closed position is the recess 34 as shown in FIG. 5B. Is a position along the support column 20 in the upstream lattice wall 16A.

  In this embodiment, the opening / closing device 32 opens and closes the opening / closing member 30 using air pressure and elasticity of rubber, and includes an elastic rope 38, an opening / closing device body 40, and a compressor 42. .

  The elastic rope 38 is for urging the opening / closing member 30 toward the closed position, and is made of a material that can be elastically deformed elastically, such as rubber. The elastic rope 38 includes a portion of the opening / closing member 30 that is separated from the support shaft 36 and a fixed plate 44 that is fixed to a downstream end (the right end in FIGS. 5A and 5B) in the recess 34. Are arranged to tie. The elastic force of the rubber rope 38 in the expansion / contraction direction urges the opening / closing member 30 to be pulled toward the closed position.

  The opening / closing device main body 40 includes a base 46 and an elastic bag body 48. The base 46 is fixed on the bottom surface of the recess 34, and the elastic bag body 48 is fixed thereon. The elastic bag body 48 rotates the opening / closing member 30 to the closed position side by its expansion. Specifically, the base 46 has an air pressure inlet (not shown), and the inside of the elastic bag body 48 communicates with the air pressure inlet. When high-pressure air is supplied into the elastic bag body 48 from the air pressure inlet, the elastic bag body 48 expands, and the opening / closing member 30 is moved from the closed position shown in FIG. 5A to the elastic rope. It is pushed up to the closed position shown in FIG.

  The compressor 42 is for supplying compressed air into the elastic bag body 48, and is connected to the air pressure inlet of the base 46 via an electromagnetic on-off valve 52 and a regulator 51. The compressed air discharged from the compressor 42 is depressurized to a predetermined pressure by the regulator 51 and is press-fitted into the elastic bag body 48 through the electromagnetic on-off valve 52 and the air pressure inlet. The electromagnetic open / close valve 52 is used to enable remote operation of open / close switching by the open / close device 32, and performs valve opening and closing operations according to command signals input from the outside.

  In the present invention, the specific configuration of the switchgear is not limited. The opening / closing device may be, for example, a device that drives the opening / closing member 30 by an actuator that uses air pressure or other fluid pressure, or may use an electric actuator. The present invention also includes a mode in which the opening / closing device 32 is omitted and the opening / closing member 30 is manually switched.

  The closed position of the opening / closing member 30 may be a position in contact with the support column 20 of the upstream lattice wall 16A. In other words, the opening / closing device 32 may hold the opening / closing member 30 in the closed position by pressing the opening / closing member 30 against the support column 20. This makes it possible to further stabilize the closed position of the opening / closing member 30 by effectively using the support column 20.

  Furthermore, by providing a lock mechanism represented by the latch 53 shown in FIG. 6, the holding of the closed position becomes more reliable. The latch 53 is pivotally attached to the column 20 of the upstream lattice wall 16A, and releases the pivot end of the opening / closing member 30 that has been switched to the closed position as shown in the figure. Switched to position. The locking of the opening / closing member 30 by the latch 53 locks the opening / closing member 30 in the closed position against the pressure of debris flow as will be described later, and reduces the driving load of the opening / closing device 32.

  Next, the operation of the transmission type sabo dam 10 will be described.

  In a normal time when no flooding occurs, the opening / closing member 30 is switched to the open position as shown in FIGS. Specifically, the air supply to the elastic bag body 48 is shut off by closing the electromagnetic opening / closing valve 52 of the opening / closing device 32. At this time, the opening / closing member 30 is pulled to the open position by the elastic rope 38.

  In the open position, the opening / closing member 30 opens the gap formed by the lowermost portion 24 of the upstream lattice wall 16 </ b> A (the gap between the columns 20) and is housed in the recess 34 of the bottom wall 13. The opening of the gap also allows passage of fine gravel or the like (fine gravel or earth and sand) contained in the water flowing through the water channel 14. However, since the flow of water at this normal time is slow, rapid accumulation of the fine gravel does not occur.

  On the other hand, when the occurrence of a flood is notified, the opening / closing member 30 is quickly switched to the closed position. Specifically, when the electromagnetic on-off valve 52 of the opening / closing device 32 is opened, supply of high-pressure air from the compressor 42 into the elastic bag body 48 is permitted. The high-pressure air inflates the elastic bag body 48 and raises the opening / closing member 30 to the closed position against the elastic tensile force of the elastic rope 38. Furthermore, when the transmission type sabo dam 10 includes a latch 53 as shown in FIG. 6, the opening / closing member 30 is additionally locked by the latch 53.

  The opening / closing member 30 in this closed position effectively closes the gap formed by the lowermost portion 24 of the upstream lattice wall 16A, and prevents passage of fine pebbles and the like that arrive at the early stage of the flood. Thereafter, when a main debris flow arrives, boulders and the like gathering at the head of the debris flow are captured by the support column 20 in the lowermost portion 24, and medium pebbles are separated from the lattice wall portions and gaps above the lowermost portion 24. Captured by the forming member 18. Thereby, the debris flow is effectively blocked.

  FIG. 7 shows an example of a time change of a typical flood flow. As shown in the figure, in a general flood, muddy water, fine gravel, etc. reach prior to the arrival of the debris flow to the transmission type sabo dam 10. After that, boulders and medium gravels included in the debris flow arrive in this order.

  Without the opening / closing member 30, the muddy water, fine gravel, etc. preceding the debris flow pass directly through the gap formed by the lowermost portion 24 of each of the grid walls 16A, 16B. In addition, the flow rate is larger than normal without floods. Therefore, the fine pebbles and the like may rapidly accumulate on the downstream side after passing through the gap, and hinder the good flow in the normal time later. Moreover, the recovery is difficult.

  On the other hand, when the opening / closing member 30 is switched to the closed position from the beginning of the flood, the opening / closing member 30 prevents the gravel and the like from passing therethrough and captures them. As a result, rapid accumulation of pebbles and the like on the downstream side of the transmission-type sabo dam 10 is prevented, and recovery of the pebbles after the flood is facilitated. Further, since the rugged lattice-like walls 16A and 16B or the gap forming member 18 prevent the passage of the subsequent boulders and the small pebbles, the load applied to the opening / closing member 30 is greatly reduced. This enables simplification and miniaturization of the opening / closing member 30 and the opening / closing device 32 for opening / closing the opening / closing member 30.

  In the present invention, the opening / closing switching timing of the opening / closing member 30 is not particularly limited. This timing may be determined based on the water level in the water channel 14. For example, the opening / closing member 30 may be switched to the closed position from that point when it is determined that the water level has reached a predetermined height or more as a sign of occurrence of a debris flow suddenly. Thereafter, when it is found that the rise in the water level is not caused by debris flow, the opening / closing member 30 may be returned to the open position even if the water level is high. The same applies when the debris flow notification is found to be false.

  In the present invention, the opening / closing mode of the opening / closing member 30 is not limited. As shown in FIG. 8 as the second embodiment, the left and right opening / closing members 30 may be configured as door members that open and close like a so-called double door.

  In the second embodiment, the open / close members 30 constituting the left and right door members can be rotated around an axis extending in the vertical direction at positions immediately downstream of both ends in the width direction of the upstream lattice wall 16A. It is provided to become. Then, by the rotation, the position is switched between a closed position (FIG. 8B) intersecting the flow direction of the water channel 14 and an open position (FIG. 8A) along the flow direction. Then, it is stored in the dam side wall 54.

  Specifically, the dam side wall 54 is located on the left and right of the water channel 14 and has a recess 56 at a portion facing the water channel 14. A support shaft 36 extending in the vertical direction is provided at the upstream end in the recess 56, and the left and right opening / closing members 30 are installed so as to be rotatable about the support shaft 36. The open position of the opening / closing member 30 is a position along the flow direction so as to be accommodated in the recess 56 as shown in FIG. 8 (a), and the closed position is the position as shown in FIG. 8 (b). It is a position that protrudes from the recess 56 into the water channel 14 and intersects the flow direction, and is along the column 20 in the upstream lattice wall 16A. It is more preferable that the closed position is a position pressed against the support column 20 as in the first embodiment.

  The lattice-like wall against which the opening / closing member 30 is pressed in the closed position is not limited to the upstream-side lattice-like wall 16A, and may be, for example, the downstream-side lattice-like wall 16B. In the third embodiment shown in FIG. 9, the opening / closing device 32 is provided at a position downstream of the upstream lattice wall 16A and upstream of the downstream lattice wall 16B, and the opening / closing member 30 is disposed on the opening member 30. By pressing against the downstream grid wall 16B from the upstream side, the opening / closing member 30 is held in the closed position. Similarly to the above-described embodiment, the opening / closing member 30 does not change the gap between the lowermost portions 24 of the upstream lattice wall 16A as viewed from the front.

  In this embodiment, the pressure of the flow applied to the opening / closing member 30 in the closed position acts in a direction in which the opening / closing member 30 is further pressed against the downstream lattice wall 16B (leftward in FIG. 9). This makes it possible to hold the closed position of the opening / closing member 30 more reliably and reduce the driving load for holding the closed position of the opening / closing device 32. Moreover, the switchgear 32 itself is effectively protected from boulders and the like by the upstream lattice wall 16A.

  This effect can, of course, be obtained even in a transmission type sabo dam having three or more grid walls. In that case, the grid-like wall against which the opening / closing member 30 is pressed may be the second and subsequent stages counted from the upstream side, and the opening / closing device 32 is positioned downstream of the most upstream grid-like wall (generally, It suffices if it is provided at a position immediately upstream of the grid-like wall against which the opening / closing member 30 is pressed.

  In the present invention, the specific shape and structure of the gap forming member are not limited. As elements that can constitute the gap forming member other than the crosspiece 26, for example, a ring net, an expanded metal, a steel plate in which a large number of through holes are formed, or a plurality of these elements are combined. Things.

  FIG. 10 shows an example in which the gap forming member 18 is formed of a ring net as a fourth embodiment. The ring net includes a large number of annular bodies 60. These annular bodies 60 form a net as a whole by being connected to each other vertically and horizontally. Each annular body 60 is made of, for example, a high-strength hard steel wire that is wound in a ring shape a plurality of times and bundled at a plurality of locations aligned in the circumferential direction. When the annular body 60 is formed, the annular bodies 28 adjacent to each other are connected to each other, whereby a ring net having a desired overall area and overall shape is efficiently manufactured.

  In the present invention, the gap forming member can be omitted as appropriate. For example, as shown in FIG. 11 as the fifth embodiment, even in the transmission type sabo dam 10 having no gap forming member, the lowermost part 24 of the lattice wall 16 (in the example shown in FIG. The opening / closing member is installed so as to be able to locally close only the gap formed by the height portion of the bottom surface to the height position of the lowermost connecting rod 22). Is realized.

It is a front view which shows the state by which the opening-and-closing member was switched to the open position in the transmission type sabo dam according to the 1st embodiment of the present invention. It is a side view which shows the state by which the opening-and-closing member was switched to the open position in the transmission type sabo dam according to the first embodiment of the present invention. It is a front view which shows the state by which the opening-and-closing member was switched to the closed position in the transmission type sabo dam according to the first embodiment of the present invention. It is a side view which shows the state by which the opening-and-closing member was switched to the closed position in the transmission type sabo dam according to the first embodiment of the present invention. It is a sectional side view showing an opening and closing device provided in the transmission type sabo dam, (a) is a view showing a state in which the opening and closing member is in the open position, (b) is a state in which the opening and closing member is in the closed position. It is a figure which shows a state. It is a side view which shows the example to which the latch for opening-and-closing member latching was added in the transmission type sabo dam shown in FIG. It is a graph which shows the general example of the time distribution of the flood flow which can generate | occur | produce in a transmission type sabo dam. (A) is a cross-sectional top view which shows the opening / closing apparatus in the 2nd Embodiment of this invention, (a) is a figure which shows the state in which the said opening / closing member exists in the said open position, (b) is the said opening / closing member It is a figure which shows the state which exists in the said closed position. It is a side view which shows the principal part of the transmission type sabo dam according to the 3rd Embodiment of this invention. It is a perspective view which shows the external appearance of the transmission type sabo dam according to the 4th Embodiment of this invention. It is a front view which shows the external appearance of the transmission-type sabo dam according to the 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Transmission type sabo dam 12 Dam 13 Bottom wall 14 Water channel 16A Upstream grid-like wall 16B Downstream grid-like wall 18 Gap formation member 20 Support | pillar (vertical rod-shaped member)
22 Connecting rod (horizontal bar)
24 Lowermost part of upstream lattice wall 26 Crosspiece 30 Opening / closing member 32 Opening / closing device 36 Support shaft 60 Annular body

Claims (10)

A transmission type sabo dam installed in a channel with a specific width,
A grid-like wall having a plurality of rod-like members which are erected so as to cross the water channel in the width direction in the water channel and are combined so as to cross each other vertically and horizontally;
The gap formed by the lattice wall has a shape capable of locally closing the gap formed by the lowermost portion thereof, and can be switched between a closed position for closing the gap and an open position for opening the gap. A transmission type sabo dam characterized by comprising a member. In the transmission type sabo dam according to claim 1,
The portion of the gap where the opening and closing member opens and closes is a portion from the height position of the bottom surface of the water channel to a height position equal to or lower than the height position of the lowermost horizontal rod-shaped member of the rod-shaped members. Transmission type sabo dam characterized by In the transmission type sabo dam according to claim 1 or 2,
A gap forming member that is provided in a region above the region that is opened and closed by the opening and closing member in the lattice wall and that forms a gap smaller than the maximum dimension of the lattice of the lattice wall is provided. Transmission type sabo dam. In the transmission type sabo dam according to any one of claims 1-3,
The opening / closing member is installed so as to be rotatable around an axis extending in the width direction at a bottom portion of the water channel or in the vicinity thereof, and by the rotation, the closed position where the body falls along the bottom portion of the water channel and the A transmission type sabo dam characterized by being switched to a closed position rising from the bottom of a waterway. In the transmission type sabo dam according to any one of claims 1-3,
The opening / closing member has a pair of left and right door members provided so as to be rotatable about an axis extending in the vertical direction at positions at or near both ends of the grid-like wall in the width direction. A transmission type sabo dam characterized by being switched between a closed position intersecting the flow direction of the water channel and an open position along the flow direction by the rotation. In the transmission type sabo dam according to any one of claims 1 to 5,
A transmission type sabo dam comprising an opening / closing device for moving the opening / closing member between a closed position and an open position. In the transmission type sabo dam according to claim 6,
The transmission type sabo dam, wherein the opening / closing device holds the opening / closing member in the closed position by pressing the opening / closing member against the lattice wall. In the transmission type sabo dam according to claim 7,
A transmission type sabo dam comprising a lock mechanism for removably coupling the open / close member switched to the closed position to the lattice wall to lock the open / close member in the closed position. In the transmission type sabo dam according to claim 7 or 8,
The lattice walls are juxtaposed over a plurality of stages along the flow direction of the water channel,
The opening / closing member is provided on the downstream side of the lattice wall on the most upstream side, and presses the opening / closing member from the upstream side to the lattice wall on the downstream side of the lattice wall on the most upstream side. A transmission type sabo dam that holds the opening and closing member in the closed position. In the transmission type sabo dam according to any one of claims 1-9,
The gap forming member includes at least one of a plurality of crosspieces arranged side by side vertically, a ring net, an expanded metal, and a steel plate in which a large number of through holes are formed. Transmission type sabo dam.

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