JP2009024364A - Permeable check dam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent downstream side posts constituting a permeable check dam body, from being damaged by gravel falling over the permeable check dam body in a flood by providing the top part of the permeable check dam body with a hood extending downstream. <P>SOLUTION: This permeable check dam has the permeable check dam body 1 comprising the downstream side posts 3 inclining upstream, and the hood 9 provided at the top part of the permeable check dam body 1 and extending downstream. The hood 9 prevents the downstream side posts 3 from being damaged by gravel falling over the permeable check dam body 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is provided with a transmission type sabo dam, and in particular, a rod that can reliably prevent the downstream strut of the transmission type sabo dam body from being damaged by gravel falling over the transmission type sabo dam body during a flood. It relates to the transmission type sabo dam.

  The transmission-type sabo dam prevents gravel and driftwood flowing from the upstream side during a major flood, and allows sediment to flow downstream during normal and small and medium floods, ensuring the planned capacity of the dam, and It has various advantages not found in impervious dams that do not allow sediment to flow down, such as meeting natural providence.

  Conventionally, as a transmission type sabo dam, there is one disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 7-82725). Hereinafter, this transmission type sabo dam is called a conventional transmission type sabo dam, and will be described with reference to the drawings.

  FIG. 5 is a side view showing a conventional transmission type sabo dam.

  As shown in FIG. 5, the conventional transmission type sabo dams are constructed on a concrete foundation 13 by three-dimensionally assembling a pillar 11 and a beam 12 made of steel pipe, and the upper part of the downstream pillar 11A is Inclined toward the upstream side.

JP-A-7-82725

  However, the conventional transmission-type sabo dam has a problem in that the downstream column 11A inclined toward the upstream side is damaged by gravel falling over the transmission-type sabo dam during a flood. This problem becomes prominent when the transmission sabo dam is enlarged and the dam height is increased, so that the gravel fall energy increases in proportion to the gravel fall height. If the downstream strut 11A is damaged, the strength of the entire dam may be reduced, so it is necessary to replace the damaged strut with a new strut. It is not easy to change the struts. Therefore, in some cases, the entire dam had to be rebuilt.

  Accordingly, an object of the present invention is to provide a transmission-type sabo dam that can reliably prevent damage to a downstream column due to the fall of gravel during a flood.

  The invention according to claim 1 includes a transmission-type sabo dam body provided with a downstream support column inclined toward the upstream side, and a ridge provided on the top of the transmission-type sabo dam body, extending toward the downstream side. And the saddle is characterized by preventing damage to the downstream strut due to gravel falling over the transmission type sabo dam body.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the hook is provided detachably with respect to the transmission type sabo dam body.

  The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the hook is inclined downward toward the downstream side.

  A fourth aspect of the invention is characterized in that, in the invention according to any one of the first to third aspects, the hook protrudes downstream from the most downstream end of the downstream column. is there.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein an opening is formed in the ridge, and the width of the opening is a gravel that damages the downstream column by dropping. It is characterized by being less than the minimum diameter.

  The invention described in claim 6 is characterized in that, in the invention described in any one of claims 1 to 5, the ridge is reinforced by a reinforcing material.

  A seventh aspect of the invention is characterized in that, in the invention according to any one of the first to sixth aspects of the invention, the ridge is composed of a beam material assembled in a lattice shape.

  According to the present invention, the following effects are brought about.

  (1) Downstream struts that make up the permeable sabo dam body by gravel falling over the permeable sabo dam body during a flood by providing a trough extending toward the downstream side at the top of the permeable sabo dam body Can be reliably prevented from being damaged.

  (2) By attaching the reed to the transmission type sabo dam body so as to be detachable, the reed can be easily exchanged, and the reed can be easily attached to the existing transmission type sabo dam body.

  (3) By tilting the dredging downward toward the downstream side, the gravel on the dredging can be naturally dropped without depositing the gravel on the dredging, so the maintenance of the dam becomes easy.

  (4) By making the width of the opening formed in the cage less than the minimum diameter of the gravel that damages the downstream column by dropping, the gravel that does not damage the downstream column by dropping can be dropped from the cage in advance. This makes it easy to maintain the dam.

  (5) The strength of the rod can be increased by providing a reinforcing rod-like reinforcing material between the rod and the downstream column.

  Next, one embodiment of the transmission type sabo dam according to the present invention will be described with reference to the drawings.

  1 is a side view showing a transmission type sabo dam according to the present invention, FIG. 2 is a plan view showing the transmission type sabo dam according to the present invention, and FIG. 3 is a side view showing a heel portion reinforced by a reinforcing material. 4 is a side view showing a flange portion inclined downward.

  1 and 2, reference numeral 1 denotes a transmission type sabo dam main body, and an upstream column 2, a downstream column 3, an upstream beam 4, a downstream beam 5, a side beam 6, and an intermediate column 7 are connected to a concrete foundation 8. It is made up of things assembled in a bowl shape on top.

  The upstream support column 2 is inclined toward the downstream side, and the downstream support column 3 is inclined toward the upstream side. The upstream beam 4 is horizontally disposed between the upstream columns 2, and the downstream beam 5 is horizontally disposed between the downstream columns 3. The side beam 6 is horizontally disposed between the upstream column 2 and the downstream column 3. The intermediate strut 7 is inclined and disposed between the concrete foundation 8 and the upstream strut 2.

  9 is a gutter attached to the top of the transmission type sabo dam main body 1 and extending horizontally toward the downstream side. The protruding length (L) of the flange 9 is a length that protrudes downstream from the most downstream end of the downstream column 3. In this way, by increasing the length of the rod 9, the flow speed of the debris flow is slow, and even if the gravel falls almost vertically from the tip of the rod due to free fall, damage to the downstream column 3 can be prevented.

  The eaves 9 are made of a steel pipe beam 9B assembled in a lattice shape, and the width of the opening (S) is less than the minimum diameter of gravel that damages the downstream column 3 due to falling. By doing in this way, since the gravel which does not damage the downstream support | pillar 3 by fall can be dropped beforehand by the dead weight from the opening (S) of the eaves 9, maintenance of a dam becomes easy.

  The eaves 9 is composed of beams 9A and 9B assembled in a lattice shape, and is attached to the beam 9C which is fixed by projecting to the upper side of the upstream column 2 of the dam body 1 by a flange or the like by means of a flange or the like. It is fixed freely. By forming the ridges 9 in a lattice shape, the size of the gravel to be dropped can be easily adjusted. By attaching the reed 9 to the transmission type sabo dam body 1 so as to be detachable, even if the reed 9 is damaged or destroyed, it can be easily replaced. Moreover, the replacement work can be performed safely and easily because it can be performed at the top of the dam body 1.

  On the other hand, in the case of a conventional transmission type sabo dam with no wrinkles, the struts will be replaced. However, as described above, the struts are firmly constructed by being embedded in the foundation concrete of the riverbed. The replacement work is not easy. In addition, by making the rods 9 detachable, the lattice spacing of the rods 9 and the length of the rods 9 can be easily changed by exchanging the rods 9 in accordance with the debris flow conditions of the river that constructs the dam.

  In addition, you may provide gravel fall assistance members, such as an expanded metal with a mesh smaller than a grid | interval space | interval, and a lattice metal net, on the cage | basket 9. By providing such a gravel dropping auxiliary member, the size of the gravel dropped from between the lattices of the cage 9 can be easily adjusted without exchanging the cage 9.

  Moreover, the strength of the rod 9 can be further increased by providing the reinforcing member 10 having a tension bar shape between the rod 9 and the downstream column 3. By increasing the strength of the ridge 9 with the reinforcing material 10, damage and destruction of the ridge 9 due to the impact energy of the gravel flowing over and the gravel on the ridge 9 can be reliably prevented.

  In addition, as shown in FIG. 4, the gravel on the reed 9 can be naturally dropped without causing the gravel to accumulate on the reed 9 by tilting the reed 9 downward toward the downstream side. This eliminates the need to remove the dam and facilitates maintenance of the dam. Further, if the ridge 9 is inclined, acceleration is applied and the gravel can be dropped further away, so that damage to the downstream column 3 can be more reliably prevented.

  Furthermore, the gravel 9 can capture gravel even when the debris flow velocity is slow or when gravel accumulates on the upstream column 2 and becomes full. Moreover, the function which captures the gravel which damages downstream can also be provided. In this case, it is more effective to increase the protrusion length of the flange 9.

  The beam material of the eaves 9 may be H-shaped steel, L-shaped steel, or the like other than steel pipes, or may be a material other than steel.

  The above is the application of the present invention to a transmission type sabo dam assembled in an inverted V shape, but it is of course possible to apply it to a transmission type sabo dam having a shape as shown in FIG.

  As described above, according to the present invention, by providing a ridge extending toward the downstream side at the top of the transmission-type sabo dam body, the transmission-type sabo is prevented by gravel falling over the transmission-type sabo dam body during a flood. It can prevent reliably that the downstream support | pillar which comprises a dam main body is damaged.

  In addition, the heel can be easily replaced by detachably attaching the ridge to the transmission type sabo dam body.

  Moreover, since the gravel on the ridge can be naturally dropped by inclining the ridge downward toward the downstream side, dam maintenance is facilitated.

  Furthermore, by making the width of the opening formed in the cage less than the minimum diameter of the gravel that damages the downstream column by dropping, the gravel that does not damage the downstream column by dropping can be dropped in advance from the cage. So dam maintenance becomes easy.

It is a side view which shows the transmission type sabo dam of this invention. It is a top view which shows the transmission type sabo dam of this invention. It is a side view which shows the collar part reinforced with the reinforcing material. It is a side view which shows the collar part inclined downward. It is a side view which shows the conventional transmission type sabo dam.

Explanation of symbols

1: Transmission type sabo dam body 2: Upstream column 3: Downstream column 4: Upstream beam 5: Downstream beam 6: Side beam 7: Intermediate column 8: Concrete foundation 9: 庇 9A: Beam 9B: Beam Material 9C: Beam material 10: Reinforcement material 11: Column 11A: Downstream column 12: Beam 13: Concrete foundation

Claims (7)

  A transmission-type sabo dam body provided with a downstream column inclined toward the upstream side; and a ridge provided on the top of the transmissive sabo dam body, extending toward the downstream side, wherein A transmission type sabo dam that prevents damage to the downstream strut due to gravel falling over the main body of the sabo dam.   2. The transmission type sabo dam according to claim 1, wherein said ridge is provided detachably with respect to said transmission type sabo dam body.   The transmission type sabo dam according to claim 1, wherein the ridge is inclined downward toward the downstream side.   The transmission type sabo dam according to any one of claims 1 to 3, wherein the ridge protrudes downstream from the most downstream end of the downstream column.   5. The method according to claim 1, wherein an opening is formed in the ridge, and the width of the opening is less than a minimum diameter of gravel that damages the downstream support column by dropping. Transmission sabo dam.   The transmission type sabo dam according to any one of claims 1 to 5, wherein the ridge is reinforced by a reinforcing material.   The transmission type sabo dam according to any one of claims 1 to 6, wherein the eaves are composed of beams assembled in a lattice shape.

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