JP5364026B2 - Transmission type sabo dam - Google Patents

Description

TECHNICAL FIELD The present invention relates to a permeable sabo dam that captures gravel and driftwood when debris flow occurs while maintaining a sediment control function in a debris flow dangerous mountain stream, and particularly to a large permeable sabo dam with a levee height exceeding 30 m. It is.

  The transmission type sabo dam according to the conventional example including the lattice type dam has many achievements as a debris flow countermeasure work. These dams supply earth and sand downstream during normal times, while gravel and driftwood are captured when debris flows occur to prevent downstream disasters. This utilizes the property that when a debris flow occurs, boulders gather at the top of the debris flow and flow down while intertwining.

  General steel transmission type dams, such as lattice type dams, have a three-dimensional lattice shape formed by steel pipes. Steel pipes receive loads caused by debris flow and earth pressure, and force is applied to the ground with many columns. It has a structure to disperse. On the other hand, until the debris flow countermeasure technical guideline was revised in 2007, the height of the steel permeable dam was effectively limited to less than 15m.

  A conventional example related to such a transmission type dam will be described below with reference to FIG. 10A and 10B relate to a transmission type sabo dam of a conventional example, in which FIG. 10A is a side view thereof, and FIG. 10B is a front view thereof viewed from the downstream side of a river.

  The transmission type dam according to the conventional example includes a three-dimensional frame 21 arranged on a river bed 25, a vertical bar-like member 22 and a horizontal bar-like member 23 laid in a grid shape in a river transverse direction and longitudinal direction. The upstream side of the river along the direction is made higher than the downstream side, and the height from the uppermost river bed 25 to the horizontal bar-like member 23 is set to 2 to 3 times the diameter of the boulder, and the horizontal bar-like member above the height 23 interval is made below the diameter of a boulder (refer patent document 1).

  As a result, the entanglement of the boulders captured above 2 to 3 times the diameter of the boulders is not destroyed by the subsequent flow, so that the captured gravel and earth and sand caused by the destruction of the boulders are not It will not flow again. However, the structure of the transmission type dam according to the conventional example is considered to be applicable to a dam with a levee height of 15 m or more in accordance with the revised debris flow countermeasure technical guidelines. It cannot withstand the strength of a large dam.

Next, a transmission type dam according to another conventional example using a rope will be described with reference to FIG. FIG. 11 is a front view of an embodiment of a debris flow protection net according to another conventional example.
In this debris flow protection net 31 according to another conventional example, the ends of the main rope 32 stretched so as to block the flow of the river are anchored to the side walls of both banks, and a plurality of vertical ropes 36 are provided at intervals on the left and right. The upper end of each vertical rope 36 is connected to the main rope 32 and the lower end is anchored to the river bed a, and a plurality of horizontal ropes 37 are stretched below the main rope 32 with a space in the vertical direction. At the same time, the ends of the horizontal ropes 37 are anchored to the side walls b on both banks, and the intersections of the horizontal ropes 37 and the vertical ropes 36 are combined into a net shape (see Patent Document 2).

  According to the debris flow protection net 31 having such a structure, it is difficult to apply it to a dam with a levee height of 15 m or more in accordance with the revised debris flow countermeasure technical guidelines because of the limit on the strength of the net 31.

JP-A-7-82725 JP 2009-299321 A

  The present invention has been made in order to solve the various problems as described in the background art, and its purpose is to make a steel transmission type dam applicable to a large sabo dam with a high levee height. Is to provide.

  The present invention for achieving the above object comprises a transmission type sabo dam having the following configuration. That is, the means adopted by the transmission-type sabo dam according to claim 1 of the present invention is based on a metal sabo dam main body portion in which a plurality of columnar members made of a metal material are crossed in the vertical and horizontal directions, and a sediment flow. When an external force is applied to the metal sabo dam main body, it is a transmission type sabo dam that has a supporting base for the metal sabo dam to receive the external force.

  At the same time, the metal sabo dam body portion is composed of an upper dam body portion and a lower dam body portion that are separated into two vertically, and the support base portion supports the upper dam body portion. A plurality of columnar members that have sleeve portions on both sides and a bottom portion that supports the lower dam body portion, and among the plurality of columnar members that constitute the upper dam body portion, at least the longitudinal columnar members at both ends are fixedly supported by the sleeve portions On the other hand, among the plurality of columnar members constituting the lower dam main body, at least the lower end portion of the columnar member in the vertical direction is fixedly supported by the bottom portion.

  The means adopted by the transmission type sabo dam according to claim 2 of the present invention is the transmission type sabo dam according to claim 1, wherein the lower dam body portion is supported diagonally from below the dam downstream side. The upper end portion of the oblique support portion is joined to the vertical columnar member on the downstream side of the dam constituting the lower dam main body portion, and the lower end portion thereof is fixedly supported to the support base portion. It is characterized by being made.

  The means adopted by the transmission type sabo dam according to claim 3 of the present invention is the transmission type sabo dam according to claim 2, wherein the diagonal support portions are arranged obliquely from below the dam downstream side. It consists of an oblique direction columnar member, and is provided with the protection member on the upper surface side of the outermost oblique direction columnar member.

The means adopted by the transmission type sabo dam according to claim 4 of the present invention is that a plurality of columnar members made of a metal material cross each other in the vertical and horizontal directions, and an external force due to a sediment flow or the like. A transmission-type sabo dam having a base part for supporting a metal sabo dam to receive the external force when added to the metal sabo dam main body.
At the same time, the metal sabo dam body portion is configured by connecting an upper dam body portion and a lower dam body portion, and the support base portion includes sleeve portions on both sides that support the upper dam body portion. A plurality of columnar members constituting the upper dam body part, and at least the longitudinal columnar members at both ends are fixedly supported by the sleeves, Previous
Of the plurality of columnar members constituting the lower dam body portion, at least the lower end portion of the columnar member in the vertical direction is fixedly supported by the bottom portion.
The means adopted by the transmission type sabo dam according to claim 5 of the present invention is the transmission type sabo dam according to claim 4, wherein the lower dam main body is supported diagonally from below the dam downstream side. The upper end portion of the oblique support portion is joined to the vertical columnar member on the downstream side of the dam constituting the lower dam main body portion, and the lower end portion thereof is fixedly supported to the support base portion. It is characterized by being made.
The means adopted by the transmission type sabo dam according to claim 6 of the present invention is the transmission type sabo dam according to claim 5, wherein the oblique support portions are arranged in a plurality of directions obliquely from below the dam downstream side. It consists of an oblique direction columnar member, and is provided with the protection member on the upper surface side of the outermost oblique direction columnar member.

  According to the transmission type sabo dam according to claim 1 of the present invention, a metal sabo dam main body portion in which a plurality of columnar members made of a metal material are crossed in the vertical and horizontal directions, and an external force due to a sediment flow or the like is applied to the metal. A transmission-type sabo dam with a base for supporting a metal sabo dam to receive the external force when added to the sabo dam main body, wherein the metal sabo dam main body is The upper dam body portion and the lower dam body portion that are separated into two in the upper and lower directions, and the supporting base portion includes sleeve portions on both sides that support the upper dam body portion, and the lower dam body portion. Of the plurality of columnar members constituting the upper dam body portion, and at least the vertical columnar members at both ends are fixedly supported by the sleeve portions, while the lower dam body portion is constituted. Out of multiple columnar members Also the lower end of the longitudinal direction of the columnar member is fixedly supported on the bottom.

  As a result, when an external force due to debris flow or the like is applied to the sabo dam body, the external force transmission path includes sleeves on both sides that support the upper dam body, and a bottom that supports the lower dam body. Therefore, it can also be applied to large-scale transmission-type sabo dams that generate a large external force due to sediment flow. In addition, workability is good, and construction over a plurality of years is possible.

  Moreover, according to the transmission type sabo dam according to claim 2 of the present invention, the lower dam main body has an oblique support portion supported from an oblique lower side on the downstream side of the dam, and an upper end portion of the oblique support portion. Is joined to the vertical columnar member on the downstream side of the dam that constitutes the lower dam body, and its lower end is fixedly supported by the support base, so that it can resist even greater external forces. A transparent sabo dam can be realized.

  Furthermore, according to the transmission type sabo dam according to claim 3 of the present invention, the oblique support portion is composed of a plurality of oblique columnar members arranged obliquely from below the dam downstream side, and the outermost oblique direction. Since the protective member is provided on the upper surface side of the columnar member, it is possible to prevent the oblique columnar member from being damaged by gravel falling from the top end of the metal sabo dam main body.

Furthermore, according to the transmission type sabo dam according to claim 4 of the present invention, since the upper dam body portion and the lower dam body portion are connected, the height of the boulders collected and accumulated by the dam is high. Even if the height does not exceed the height of the lower dam body, the external force due to sediment flow loaded on the metal transmission sabo dam is transmitted not only to the lower dam body but also to the upper dam body. As a result, the bottom and sleeve portions of the support base are more effectively distributed and supported.
Moreover, according to the transmission type sabo dam according to claim 5 of the present invention, the lower dam body has an oblique support portion supported from an obliquely lower side on the downstream side of the dam, and an upper end portion of the oblique support portion. Is joined to the vertical columnar member on the downstream side of the dam that constitutes the lower dam body, and its lower end is fixedly supported by the support base, so that it can resist even greater external forces. A transparent sabo dam.
Furthermore, according to the transmission type sabo dam according to claim 6 of the present invention, the oblique support portion is composed of a plurality of oblique columnar members arranged obliquely from below the dam downstream side, and the outermost oblique direction. Since the protective member is provided on the upper surface side of the columnar member, it is possible to prevent the oblique columnar member from being damaged by gravel falling from the top end of the metal sabo dam main body.

It is the elevation sectional view which looked at the metallic sabo dam main-body part of the transmission type sabo dam according to Embodiment 1 of the present invention from the downstream side of the mountain stream. It is the arrow line view which looked at FIG. 1 from the AA arrow including the diagonal support part. It is the top view which planarly viewed FIG. 1 including the diagonal support part. It is the elevation sectional view which looked at the metal sabo dam main-body part of the transmission type sabo dam according to Embodiment 2 of the present invention from the downstream side of a mountain stream. It is the arrow line view which looked at FIG. 4 from the BB arrow including the diagonal support part. It is the top view which planarly viewed FIG. 4 including the diagonal support part. It is the elevation sectional view which looked at the metallic sabo dam main-body part of the transmission type sabo dam according to Embodiment 3 of the present invention from the downstream side of a mountain stream. It is the arrow line view which looked at FIG. 7 including the diagonal support part by CC. It is the top view which planarly viewed FIG. 7 including the diagonal support part. It is related with the transmission type sabo dam of a prior art example, a figure (a) is the side view, and a figure (b) is the front view seen from the river downstream. It is a front view of the Example of a debris flow protection net concerning another prior art example.

  A transmission type sabo dam according to Embodiment 1 of the present invention will be described below with reference to FIGS. 1 is an elevational sectional view of a metal sabo dam main body portion of a transmission type sabo dam according to Embodiment 1 of the present invention as viewed from the downstream side of a mountain stream, and FIG. 2 includes FIG. FIG. 3 is a plan view of FIG. 1 in plan view including an oblique support portion.

  The transmission type sabo dam according to Embodiment 1 of the present invention is a transmission type sabo dam having a metal sabo dam main body 2 and a support base 4 that supports a metal sabo dam 1 described later. . The metal sabo dam main body 2 has a structure in which a plurality of vertical columnar members 5 and horizontal columnar members 6 made of a metal material such as a steel pipe are joined to cross each other in the vertical and horizontal directions. ing.

  The supporting base 4 is a concrete structure that fixes and supports the metal sabo dam 1 in order to receive the external force when an external force such as a sediment flow is applied to the metal sabo dam 1. It is constructed transversely to the flow in the mountain stream or river bedrock. And the metal sabo dam 1 which concerns on Embodiment 1 of this invention is comprised from the metal sabo dam main-body part 2 and the diagonal support part 3 mentioned later.

  Further, the metal sabo dam main body 2 is composed of an upper dam main body 2a and a lower dam main body 2b which are separated into two in the vertical direction. On the other hand, the support base 4 has sleeve portions 4a, 4a that support the upper dam body 2a from both sides in the mountain stream opening, and a bottom 4b that supports the lower end of the lower dam body 2b. .

  Still further, among the plurality of columnar members constituting the upper dam body 2a, that is, the longitudinal columnar member 5 and the lateral columnar member 6, at least the longitudinal columnar members 5a and 5a at both ends are respectively formed by the sleeve portions 4a and 4a. On the other hand, among the plurality of columnar members 5 and 6 constituting the lower dam body 2b, at least the lower end 5b of the vertical columnar member 5 is fixedly supported on the bottom 4b of the support base 4 while being fixedly supported. .

  Here, the portions where the upper dam body 2a is fixedly supported by the sleeves 4a and 4a are not limited to the longitudinal columnar members 5a and 5a at both ends. For example, the upper dam body 2a Any number of the transverse columnar members 6 constituting the projection may protrude from the longitudinal columnar members 5a and 5a at both ends and be fixedly supported on the sleeve portions 4a and 4a, respectively. In addition, the portion where the lower dam body 2b is fixedly supported by the bottoms 4b and 4b is not limited to the lower end 5b of the vertical columnar member 5, and for example, simultaneously forms the lower dam body 2b. Any number of the horizontal columnar members 6 may protrude from the vertical columnar members 5 and 5 at both ends and be fixedly supported on the sleeve portions 4a and 4a, respectively.

  And the grid-like meshes of the metal sabo dam main body 2 formed by intersecting the vertical columnar members 5 and the horizontal columnar members 6 in the vertical and horizontal directions are not uniform as described below. . That is, in the upper dam main body portion 2a, a plurality of vertical columnar members 5 and horizontal columnar members 6 allow a pure interval w in the vertical and horizontal directions, that is, between adjacent vertical columnar members 5 and 5, or a horizontal columnar shape. The inner dimensions between the members 6 and 6 are arranged so as to be equal to or less than the diameter dmax of the boulders, and the small lattice cells 7 are formed.

  In the lower dam main body 2b, the lowermost horizontal columnar member 6a is laid from the bottom 4b to a height that is 1 to 2 times the diameter dmax of the boulder, and the horizontal columnar member 5 and the lowermost horizontal direction. Large lattice meshes 8 are formed by the columnar members 6a. Also, on the upper side of the lowermost horizontal columnar member 6a, a plurality of horizontal columnar members 6 are laid horizontally so that the pure interval w is equal to or less than the diameter dmax of the boulder, like the upper dam body portion 2a. Small lattice cells 7 smaller than the large lattice cells 8 are formed.

  As a result, in the transmission type sabo dam according to Embodiment 1 of the present invention, when an external force due to a sediment flow or the like is applied to the entire sabo dam body 2, the transmission path of the external force is the upper dam body 2 a. Since it can disperse | distribute to the sleeve part 4a of the both sides which support the bottom part 4b which supports the said lower dam main-body part 2b, it can oppose a big external force. In addition, workability is good, and construction over a plurality of years is possible.

  The longitudinal columnar member 5 and the lateral columnar member 6 constituting the metal sabo dam main body 2 are preferably steel pipes having a closed cross section such as round steel pipes or square steel pipes, but are made of steel shapes such as H-shaped steel and L-shaped steel. It is also possible to use it.

  Furthermore, in the transmission type sabo dam according to Embodiment 1 of the present invention, the lower dam body portion 2b has an oblique support portion 3 supported from an oblique lower side on the downstream side of the dam. And this diagonal support part 3 is comprised from the several diagonal direction columnar member 9 which consists of metal materials, such as a steel pipe, and the upper end part 9a is the vertical direction columnar member of the dam downstream side which comprises the lower dam main-body part 2b. While being joined to 5, the lower end portion 9b is fixedly supported by the supporting base portion 4b. For this reason, it is possible to compete with a greater external force. In addition, the said diagonal support part 3 may be formed not only from the several diagonal direction columnar member 9, but from several plate-shaped members etc. parallel to the flow of a mountain stream.

  Next, the operation of the transmission type sabo dam according to such a configuration will be described. First, in the case of a medium-scale flood, gravel and muddy water of a size that does not cause a disaster flow downstream through the large lattice grid 8 formed in the lowermost stage of the lower dam body 2b.

  On the other hand, when the debris flow occurs, the boulders at the beginning of the debris flow are captured by the plurality of vertical columnar members 5 arranged vertically in the large lattice grid 8 and accumulated on the upstream side of the lower dam body 2b. After that, the subsequent stream consisting of mud mixed with gravel flows down, but when the height of the captured and accumulated boulders becomes 1 to 2 times the diameter dmax of the boulders, Is captured by the horizontal columnar member 6 that is horizontally mounted so that the diameter becomes less than the diameter dmax of the boulder. In this case, as long as the height of the boulders collected and accumulated does not exceed the height of the lower dam body portion 2b, the external force due to the debris flow added to the metal transmission type sabo dam 1 is the lower dam body portion 2b. As a result, it is supported by the bottom 4b of the support base 4 as a result.

  Further, the subsequent flow, which is muddy water mixed with gravel, passes over the boulders captured so as to be entangled with the lattice grid formed by the vertical columnar members 5 and the horizontal columnar members 6, and the permeable sabo dam can be As it passes, this subsequent flow may destroy the tangle of boulders. However, even in such a case, in the transmission type sabo dam according to the present invention, the pure interval w between the columnar members 6 in the upper dam body portion 2a and the lower dam body portion 2b is less than the diameter dmax of the boulder. In addition to the arrangement, the small lattice grids 7 are formed except for the lowermost stage of the lower dam main body 2b, so that the captured boulders do not collapse and the captured soil and the like do not flow out again.

  And further, when the height of the gravel group trapped and accumulated in this transmission type sabo dam exceeds the height of the lower dam body 2b, the external force due to the sediment flow added to the metal sabo dam body 2 is as follows: Since it acts not only on the lower dam body portion 2b but also on the upper dam body portion 2a, as a result, it is transmitted to the bottom portion 4b and the sleeve portion 4a of the support base portion 4 to be dispersedly supported.

  The diameter dmax of the boulders was determined by examining the sediment deposits between the 200m upstream of the sabo dam and the downstream of the dam site, and examining the frequency distribution of about 200 or more boulders. The diameter is about 95% of the curve.

Next, a transmission type sabo dam according to Embodiment 2 of the present invention will be described with reference to FIGS. 4 is an elevational sectional view of a metal sabo dam body portion of a transmission type sabo dam according to Embodiment 2 of the present invention as viewed from the downstream side of a mountain stream, and FIG. 5 includes FIG. FIG. 6 is a plan view of FIG. 4 including an oblique support portion.
However, the difference between the second embodiment of the present invention and the first embodiment is that there is a difference in the presence or absence of a protective member for the oblique support portion, and the other configuration is exactly the same as in the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and different points will be described.

  That is, in the transmission type sabo dam according to the first embodiment, the lower dam main body 2b constituting the metal sabo dam main body 2 has the oblique support portion 3 to which the protective member is not attached. On the other hand, in the transmission type sabo dam according to the second embodiment, the protective member 10 is attached to the oblique support portion 3 that supports the lower dam body portion 2b. That is, a permeable protective member 10 capable of transmitting a debris flow is attached to the upper surface side of the outermost oblique columnar member 9. Such a protective member 10 can be formed transparently using a steel plate, a steel pipe, a reinforcing bar, a steel rope, a steel net, or the like.

  Protection attached to the upper surface of the outermost oblique columnar member 9 even if the height of the gravel cluster trapped and deposited on such a transmission type sabo dam exceeds the top of the upper dam body 2a. The member 10 prevents the oblique columnar member 9 from being damaged by falling rocks from the top edge of the upper dam body 2a.

Next, a transmission-type sabo dam according to Embodiment 3 of the present invention will be described below with reference to FIGS. FIG. 7 is an elevational sectional view of a metal sabo dam main body portion of a transmission type sabo dam according to Embodiment 3 of the present invention as viewed from the downstream side of a mountain stream, and FIG. 8 includes FIG. FIG. 9 is a plan view of FIG. 7 in plan view including an oblique support portion.
However, the third embodiment of the present invention differs from the first embodiment in that there is a difference in connection between the upper dam main body and the lower dam main body, and the rest is exactly the same as in the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be described.

  That is, in the transmission type sabo dam according to the first embodiment, the metal sabo dam body 2 is composed of an upper dam body 2a and a lower dam body 2b that are separated into at least two in the vertical direction. On the other hand, the transmission type sabo dam according to the third embodiment is configured such that the metal sabo dam body 2 is connected to the lower end of the upper dam body 2a and the upper end of the lower dam body 2b. Yes.

  As a result, according to the transmission type sabo dam according to the third embodiment of the present invention, even if the height of the boulders collected and accumulated by this dam does not exceed the height of the lower dam body 2b, the metal sabo The external force due to the sediment flow added to the dam body 2 is transmitted not only to the lower dam body 2b but also to the upper dam body 2a. As a result, the bottom 4b and the sleeve 4a of the support foundation 4 are obtained. Will be supported in a distributed manner. Therefore, according to the transmission type sabo dam according to Embodiment 2 of the present invention, it is possible to more effectively disperse the external force due to the sediment flow or the like added to the metal sabo dam 1.

  In addition, when the height of the gravel group captured and accumulated by the transmission type sabo dam exceeds the top end of the upper dam body portion 2a, the oblique columnar member 9 on the downstream side is damaged by the gravel falling from the top end. Therefore, the permeable protective member 10 can be attached to the upper surface side of the oblique columnar member 9 as in the transmissive sabo dam according to the second embodiment.

  As described above, according to the transmission type sabo dam according to the present invention, a transmission type sabo dam comprising a metal sabo dam body portion made of a metal material and a supporting base portion of the metal sabo dam is provided. The metal sabo dam body portion is composed of an upper dam body portion and a lower dam body portion separated into two vertically, and the supporting base portion supports the upper dam body portion. A plurality of columnar members that constitute the upper dam body portion, and at least the longitudinal columnar members at both ends are fixedly supported by the sleeve portions. On the other hand, among the plurality of columnar members constituting the lower dam main body, at least the lower end of the columnar member in the vertical direction is fixedly supported by the bottom.

  As a result, when external force due to sediment flow or the like is applied to the metal sabo dam main body, the external force transmission path has sleeves on both sides that support the upper dam main body, and a bottom that supports the lower dam main body. Therefore, a large-scale transmission-type sabo dam can be realized. In addition, workability is good, and construction over a plurality of years is possible.

w: pure interval,
1: Metal sabo dam,
2: Metal sabo dam body part, 2a: Upper dam body part, 2b: Lower dam body part,
3: Oblique support part,
4: support base, 4a: sleeve, 4b: bottom,
5: Vertical columnar member, 5a: Vertical columnar member at both ends, 5b: Lower end,
6: Horizontal columnar member, 6a: Bottom horizontal columnar member,
7: Small lattice mesh, 8: Large lattice mesh,
9: Diagonal columnar member, 9a: upper end, 9b: lower end,
10: Protection member

Claims (6)

When a metal sabo dam body part is formed by crossing a plurality of columnar members made of a metal material in the vertical and horizontal directions, and external force is applied to the metal sabo dam body part, the external force is received. A transmission-type sabo dam with a base for supporting a metal sabo dam,
The metal sabo dam body part is composed of an upper dam body part and a lower dam body part which are separated into two vertically,
The support base has sleeves on both sides that support the upper dam body, and a bottom that supports the lower dam body.
Among the plurality of columnar members constituting the upper dam body portion, at least the longitudinal columnar members at both ends are fixedly supported by the sleeve portions,
A transmission type sabo dam, wherein at least a lower end portion of a columnar member in a vertical direction among the plurality of columnar members constituting the lower dam main body is fixedly supported by the bottom portion.   The lower dam body portion has an oblique support portion supported from obliquely below the dam downstream side, and the upper end portion of the oblique support portion constitutes the lower dam body side longitudinal columnar member. The transmission type sabo dam according to claim 1, wherein the bottom end portion is fixedly supported by the support base portion.   The oblique support part is composed of a plurality of oblique columnar members arranged obliquely from below the dam downstream side, and includes a protective member on the upper surface side of the outermost oblique columnar member. Item 3. The transmission type sabo dam according to item 2. When a metal sabo dam body part is formed by crossing a plurality of columnar members made of a metal material in the vertical and horizontal directions, and external force is applied to the metal sabo dam body part, the external force is received. A transmission-type sabo dam with a base for supporting a metal sabo dam,
The metal sabo dam body part is configured by connecting an upper dam body part and a lower dam body part,
The support base has sleeves on both sides that support the upper dam body, and a bottom that supports the lower dam body.
Among the plurality of columnar members constituting the upper dam body portion, at least the longitudinal columnar members at both ends are fixedly supported by the sleeve portions,
A transmission type sabo dam, wherein at least a lower end portion of a columnar member in a vertical direction among the plurality of columnar members constituting the lower dam main body is fixedly supported by the bottom portion. The lower dam body portion has an oblique support portion supported from obliquely below the dam downstream side, and the upper end portion of the oblique support portion constitutes the lower dam body side longitudinal columnar member. 5. The transmission type sabo dam according to claim 4, wherein the bottom end portion is fixedly supported by the support base portion. The oblique support part is composed of a plurality of oblique columnar members arranged obliquely from below the dam downstream side, and includes a protective member on the upper surface side of the outermost oblique columnar member. Item 6. The transmission type sabo dam according to item 5.

Images