JP2013130002A - Metallic transmission type sand control dam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metallic transmission type sand control dam which hardly causes swell-head even when a width of a river bed is wide, is capable of surely capturing debris flow and also suppressing outflow of a large amount of sediment from a grid-like wall, is also inexpensive and is excellent in workability as well.SOLUTION: Extension parts 10b and 11b as holding parts for respectively holding both ends of a first grid-like wall 17 are provided on respective inner side face sides 10a and 11a of left and right non-overflow parts 10 and 11, an extension member 15d extending downwards is provided on a lower end side of the first gird-like wall 17, a distal end of the extension member 15d is fixed to a foundation part 12, diagonal members 50 and 51 extending obliquely upwards are provided from a downstream side of the foundation part 12 to the first grid-like wall 17, and the diagonal members 50 and 51 are fixed to the first grid-like wall 17.

Description

  The present invention relates to a metal transmission-type sabo dam that is suitable for a wide riverbed with an inexpensive configuration.

  Grid-type dams and transmission-type sabo dams have many achievements as debris flow countermeasures. These dams normally supply earth and sand downstream, capture gravel and driftwood when debris flows, and prevent downstream disasters. This utilizes the property that when a debris flow occurs, boulders gather at the tip of the debris flow and entangle with each other.

  A general transmission-type sabo dam is a three-dimensional grid-shaped steel transmission-type sabo dam built up by steel pipes. The steel pipe part assembled in this three-dimensional grid shape receives the load due to debris flow and earth pressure, and consists of a steel pipe. The load is transmitted to the ground by a large number of vertical members.

  However, since the steel transmission type sabo dam with a three-dimensional lattice shape as described above is generally expensive, the following is proposed as a steel transmission type sabo dam with the highest priority on cost. Yes.

  For example, it is provided to cross the water channel between the non-overflowing part made of concrete provided on both the left and right banks and the sheath pipe embedded on the inner side of these non-overflowing parts and both non-overflowing parts. A steel transmission type sabo dam with a steel horizontal member and a slit wall made of a vertical member and configured to insert the end of the horizontal member into the sheath pipe is disclosed (Patent Documents 1 and 2). reference).

JP 2007-277972 A JP 2011-89393 A

  The steel transmission type sabo dams disclosed in Patent Documents 1 and 2 are excellent in that the lateral members can be prevented from buckling due to expansion due to thermal stress. However, if the width of the riverbed becomes wider, the deformation of the slit wall becomes larger, and eventually such a slit wall cannot cope with the strength. Therefore, in the steel transmission type sabo dam using such a slit wall, a concrete partition wall is constructed in the central part (intermediate position between the two non-overflowing parts) across the river bed. It is necessary to shorten the span length of the transverse member of the slit wall respectively installed between the two. Since such measures are taken, there is a problem that the amount of placing concrete is increased and the cost is increased, and workability and time are required and workability is deteriorated.

  In addition, a concrete partition wall is installed in the central part (intermediate position between the two non-overflowing parts) that crosses the river bed, so that the permeability of running water is low, and weiring is likely to occur in the upstream flow. For this reason, the tip part of the debris flow did not reach the slit wall, and there was a problem that the debris flow could not be reliably captured. Furthermore, when weiring is resolved, there is a problem that each piece of earth and sand other than boulders is transported, and as a result, a large amount of earth and sand flows out of the slit wall.

  The object of the present invention is that, even when the width of the riverbed is wide, weiring is difficult to occur, it is possible to reliably capture debris flow, and not only a large amount of sediment discharge from the lattice wall can be suppressed, but also inexpensive. The object is to provide a metal transmission type sabo dam with excellent workability.

In order to achieve this object, the invention according to claim 1 of the present invention provides:
A water channel is formed surrounded by the left and right non-overflow sections (hereinafter referred to as “both non-overflow sections”) and the foundation provided between the non-overflow sections, and a plurality of metal A metal transmission type sabo dam provided so that grid-like walls combined so that rod-shaped members intersect vertically and horizontally cross the water channel,
Each inner surface side facing the water channel of the non-overflow portions has a holding portion for holding both ends of the lattice wall,
A plurality of metal rod-like extending members extending downward (hereinafter referred to as “extending members”) are provided on the lower end side of the lattice wall,
Each distal end of the extending member that is not hidden by both holding portions when viewed from the downstream side of the plurality of extending members is fixed to the base portion,
In order to suppress the deformation of the lattice wall due to the debris flow captured by the lattice wall, a metal support member (hereinafter referred to as “diagonal material) extending obliquely upward from the downstream side of the base portion toward the lattice wall. A metal transmission type sabo dam, characterized in that the diagonal member is fixed to the lattice wall.

The invention according to claim 2 is the invention according to claim 1,
A plurality of diagonal members are provided in a plane perpendicular to the upper surface of the base part and parallel to the flow of the water channel while being spaced apart upward from the base part.

The invention according to claim 3 is the invention according to claim 2,
Of the plurality of diagonal members, at least the uppermost diagonal member is connected to the grid-like wall by a connecting member facing the flow direction of the water channel.

The invention according to claim 4 is the invention according to claim 2 or 3,
A plurality of sets of the diagonal members are provided toward the lattice wall.

The invention according to claim 5 is the invention according to any one of claims 1 to 4,
In order to transmit the load due to the debris flow captured by the lattice wall to the both holding portions, the downstream side portions of both ends of the lattice wall hidden by the both holding portions when viewed from the downstream side A plurality of leg portions are respectively provided so as to face the flow direction, and the plurality of leg portions are respectively held by the holding portions.

The invention according to claim 6 is the invention according to claim 5,
Plates are provided on the downstream side of the plurality of leg portions, respectively, and are in contact with or fixed to the holding portions via these plates.

The invention according to claim 7 is the invention according to claim 6,
The plate has a through hole, and a bolt is inserted into the through hole and the plate is fastened to a holding portion having a female screw portion.

The invention according to claim 8 is the invention according to claim 5 or 6,
The distal ends of the plurality of leg portions are embedded in the holding portion.

The invention according to claim 9 is the invention according to any one of claims 1 to 8,
The cross-sectional shape parallel to the upper surface of the base portion of the holding portion is L-shaped.

The invention according to claim 10 is the invention according to any one of claims 1 to 9,
There are a plurality of grid walls, and the plurality of grid walls are connected by a connecting member facing the flow direction of the water channel, and extend downward to the lower end side of at least one of the plurality of grid walls. Further, a plurality of extending members are provided.

The invention according to claim 11 is the invention according to any one of claims 1 to 6,
The cross-sectional shape parallel to the upper surface of the base portion of the holding portion is a U-shape.

The invention according to claim 12 is the invention according to claim 11,
There are a plurality of grid walls, and the plurality of grid walls are connected by a connecting member facing the flow direction of the water channel, and extend downward to the lower end side of at least one of the plurality of grid walls. Further, a plurality of extending members are provided.

As described above, according to the metal transmission type sabo dam according to the present invention,
A water channel is formed surrounded by both non-overflow portions and the foundations provided between these non-overflow portions, and a lattice shape in which a plurality of metal rod-shaped members are combined to intersect vertically and horizontally A metal transmission type sabo dam provided so that a wall crosses the waterway,
Each inner surface side facing the water channel of the non-overflow portions has a holding portion for holding both ends of the lattice wall,
A plurality of extending members extending downward are provided on the lower end side of the lattice wall,
Each distal end of the extending member that is not hidden by both holding portions when viewed from the downstream side of the plurality of extending members is fixed to the base portion,
In order to suppress the deformation of the lattice wall due to the debris flow captured by the lattice wall, an oblique material extending obliquely upward from the downstream side of the base portion toward the lattice wall is provided. Because it is a configuration fixed to the lattice wall,
Even when the width of the riverbed is wide, weiring is unlikely to occur, it is possible to reliably capture debris flow, and a large amount of debris flow from the grid wall can be suppressed, and it is inexpensive and workable. In addition, it is possible to realize an excellent metal transmission type sabo dam.

BRIEF DESCRIPTION OF THE DRAWINGS It is a metal transmission type sabo dam of Embodiment 1 which concerns on this invention, Comprising: (a) is a front view (thing seen from the downstream), (b) is the same top view, (c) is (a). AA sectional drawing, (d) is BB sectional drawing of (a), (e) is the A section detail drawing of (b). It is the metal transmission type sabo dam of Embodiment 2 which concerns on this invention, Comprising: (a) is a front view (what was seen from the downstream), (b) is the same top view, (c) is (a). AA sectional drawing, (d) is BB sectional drawing of (a), (e) is the A section detail drawing of (b). It is the metal transmission type sabo dam of Embodiment 3 which concerns on this invention, Comprising: (a) is a front view (those seen from the downstream side), (b) is the same top view, (c) is (a). AA sectional drawing, (d) is BB sectional drawing of (a), (e) is the B section detailed drawing of (b). It is the metal transmission type sabo dam of Embodiment 4 which concerns on this invention, Comprising: (a) is a front view (those seen from the downstream side), (b) is the same top view, (c) is (a). AA sectional drawing, (d) is BB sectional drawing of (a), (e) is C section detail drawing of (b). It is the metal transmission type sabo dam of Embodiment 5 which concerns on this invention, Comprising: (a) is a front view (what was seen from the downstream), (b) is the same top view, (c) is (a). AA sectional drawing, (d) is BB sectional drawing of (a), (e) is D section detail drawing of (b). It is the metal transmission type sabo dam of Embodiment 6 which concerns on this invention, Comprising: (a) is a front view (what was seen from the downstream), (b) is the same top view, (c) is (a). AA sectional drawing, (d) is BB sectional drawing of (a).

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 shows a metal transmission type sabo dam according to Embodiment 1 of the present invention, where (a) is a front view (viewed from the downstream side), (b) is the same plan view, and (c) is ( (a) AA sectional drawing, (d) is BB sectional drawing of (a) (however, a basic part is abbreviate | omitted), (e) is the A section detail drawing of (b). Hereinafter, in the present embodiment, the vertical direction is the plus / minus (±) direction of the Z axis shown in FIG. 1A, the horizontal direction is the ± direction of the X axis shown in FIG. 1, and the upstream direction is the same figure. The + direction of the Y axis shown and the downstream direction are defined as the-direction of the Y axis shown in FIG.

  In FIG. 1, 10 and 11 are concrete left and right non-overflow portions viewed from the downstream side, 10 a and 11 a are left and right inner side surfaces of the non-overflow portions 10 and 11, and 12 is a non-overflow portion 10 and 11. A concrete base portion provided between the left and right non-overflow portions 10, 11 and a water channel surrounded by the base portion 12 and 10b parallel to the upper surface (XY plane) of the base portion 12. The cross-sectional shape of the left-side holding portion having an L-shape {in the direction crossing the water channel 13 from the inner side surface 10a and the downstream side (minus side of the Y-axis) of the left non-overflow portion 10, and The extending portion 10c extending in the vertical direction, 10c is a bottom portion extending from the lower end in the vertical direction (minus side of the Z axis) of the extending portion 10b toward the upstream side (plus side of the Y axis), and 11b is the base portion 12. A cross-sectional shape parallel to the upper surface (XY plane) constitutes a right-side holding portion having an L-shape {right non-transitive In the direction crossing the water channel 13 from the inner surface side 11a and the downstream side of the portion 11 and extending in the longitudinal direction, the extending portion 11c extends from the longitudinal lower end side of the extending portion 11b toward the upstream side. The bottom part, 15a, 15b, 15c are vertical members constituted by connecting steel flanged pipes, 16 is a transverse member constituted by connecting steel flanged pipes, and 17 is one vertical member 15a. A first grid-like wall 25 provided on the downstream side for capturing a debris flow in which nine vertical members 15b, one vertical member 15c and four horizontal members 16 are combined so as to intersect vertically and horizontally, In order to transmit the load due to the debris flow captured by the first lattice wall 17 to the extension portions 10b and 11b, a water channel is formed in the first lattice wall 17 hidden by the left and right extension portions 10b and 11b when viewed from the downstream side. 13 flow direction (minus Y axis) ) Are provided with four legs each facing 30), 30 is a plate provided on the downstream side of the leg 25 to contact the extension parts 10b and 11b, and 50 is orthogonal to the upper surface of the base part 12. And, in a plane parallel to the flow of the water channel 13, the steel extends obliquely upward from the downstream side of the base portion 12 toward the center in the X-axis direction (lateral direction) of the lattice wall 17 and the vicinity of the upper end side in the vertical direction. An oblique member 51 made of a flanged pipe, 51 is located in the above-mentioned plane and spaced downward from the oblique member 50 while being centered in the X-axis direction (lateral direction) center and longitudinal direction of the lattice wall 17 from the downstream side of the base portion 12. An oblique member made of a steel flanged pipe extending obliquely upward toward the vicinity, 52 is a connecting member made of a steel pipe for connecting the oblique member 50 and the lattice wall 17.

  Further, on the lower end side of the first grid-like wall 17, a portion (that is, a portion corresponding to the water channel 13) that is not hidden by the left and right extending portions 10 b and 11 b when viewed from the downstream side is below (minus the Z axis). Seven extending members 15d made of steel pipes extending in the direction) are provided. The ends of these extending members 15d are fixed to the base portion 12, respectively.

  Further, on the lower end side of the first grid wall 17, the vertical members 15 a and 15 c constituting the first grid wall 17 are respectively hidden at the positions hidden by the left and right extending portions 10 b and 11 b when viewed from the downstream side. It extends downward and doubles as an extending member. The ends of the vertical members 15a and 15c extended downward are fixed to the bottom portions 10c and 11c, respectively.

  As can be seen from FIGS. 1A, 1B, and 1D, one end side of the diagonal members 50 and 51 is fixed on the downstream side of the base portion 12, and the other end side of the diagonal members 50 and 51 is first. Are respectively fixed to the grid-like walls 17. In spite of such a low-cost and excellent workability, the diagonal members 50 and 51 suppress deformation of the first grid-like wall 17 (particularly, deformation of the lateral member 16). Even when the width of the riverbed is wide, it is possible to employ the first grid-like wall 17 in which the span length of the lateral member 16 is increased without providing a partition wall that would have to be installed. Thus, since the partition wall is not installed in the present invention, the permeability of running water is not lowered. Therefore, when a debris flow is generated, it is difficult for dams to occur, and a reliable debris flow can be captured, and a large amount of debris outflow from the first grid wall 17 can be suppressed.

  In the present embodiment, the configuration in which two diagonal members are provided has been described, but the present invention is not necessarily limited to this. In order to achieve the effects of the present invention as described above, at least one diagonal member may be provided. However, as in the present embodiment, in a plane orthogonal to the upper surface of the base portion 12 and parallel to the flow of the water channel 13 (however, strictly in a plane orthogonal to and parallel to the flow of the water channel 13 A configuration in which a plurality of diagonal materials are provided while being spaced apart upward from the base portion 12 (for example, diagonally). Or at least the uppermost diagonal member (for example, diagonal member 50) of the plurality of diagonal members to the first grid-like wall 17 by the connecting member 52 facing the flow direction of the water channel 13. By connecting them, it is possible to handle larger debris flows. Further, the plurality of diagonal members provided while being spaced apart upward from the base portion 12 are not necessarily in the same plane as described above, and may be shifted from each other with respect to the flow of the water channel 13. Absent.

  Further, as can be seen from FIGS. 1A and 1B, the ends of the vertical members 15a and 15c and the extension member 15d are fixed to the bottom portions 10c and 11c and the base portion 12, respectively. Since the plates 30 provided on the downstream side are in contact with the extending portions 10b and 11b, respectively, gravel and driftwood can be captured efficiently when debris flows are generated, and the load due to the debris flow is applied to the bottom portions 10c and 11c, the base portion 12, The extending portions 10b and 11b can be dispersed and reliably loaded.

  In this way, it is possible to supply sediment and water downstream during normal times, capture gravel and driftwood when debris flow occurs, and prevent downstream disasters.

  In addition, since the plate 30 is provided on the downstream side of the leg portion 25, a debris flow is generated and the plate 30 is generated even if the plate 30 is lightly abutting or separated from the extending portions 10 b and 11 b in the normal state. Even when the contact portions strongly contact the extension portions 10b and 11b, the stress generated at the contact portions with the extension portions 10b and 11b can be reduced. Further, the left and right end portions of the transverse member 16 made of steel pipe are not directly fixed to the inner side surfaces 10a, 11a of the left and right non-overflow portions 10, 11, and are extended through the leg portions 25. Since the structure is brought into contact with 10b and 11b, the lateral member 16 and the leg portion 25 themselves have the effect of absorbing a considerable amount of expansion and contraction energy. In addition, since the left and right end portions of the lateral member 16 and the inner side surfaces 10a and 11a of the left and right non-overflow portions 10 and 11 are not in direct contact with each other, naturally no thermal stress is generated between them. There is no concern that the transverse member 16, the leg 25 or the left and right non-overflow portions 10, 11 will be destroyed.

(Embodiment 2)
FIG. 2 shows a metal transmission type sabo dam according to the second embodiment of the present invention, where (a) is a front view (viewed from the downstream side), (b) is the same plan view, and (c) is ( (a) AA sectional drawing, (d) is BB sectional drawing of (a) (however, a basic part is abbreviate | omitted), (e) is the A section detail drawing of (b). In the present embodiment, the same components as those in the first embodiment are given the same numbers, and detailed description thereof is omitted, and only different portions will be described in detail.

  As shown in FIGS. 2A, 2B, and 2D, in the present embodiment, the first lattice-like wall 17 is used from the downstream side of the base portion 12 as in the first embodiment. Is not provided so as to extend obliquely upward toward the center in the X-axis direction (lateral direction) and the upper end side in the vertical direction, but from the downstream side of the base portion 12 in the X-axis direction (lateral (Direction) A different characteristic point is that it is provided so as to extend obliquely upward toward the upper end side in the vertical direction and at a position shifted to the left and right from the center. That is, in the plane perpendicular to the upper surface of the base portion 12 and parallel to the flow of the water channel 13 and shifted from the downstream side of the base portion 12 to the left side from the center in the X-axis direction (lateral direction) of the first lattice wall 17. The diagonal members 60 and 61 made of steel flanged pipes are extended obliquely upward while being separated toward the position. The diagonal member 60 and the first lattice wall 17 are connected by a connecting member 62 made of a steel pipe. The X-axis direction of the first grid wall 17 (see, for example, the diagonal members 60 and 61 and the connecting member 62) is viewed from the downstream side of the base portion 12 (see FIG. 2). (Horizontal direction) It is also provided at a position shifted from the center to the right side (for example, composed of diagonal members 70, diagonal members 71 (not shown) and connecting members 72 (not shown)). Thus, by providing a plurality of sets of diagonal members toward the first grid-like wall 17, it is possible to cope with a larger debris flow than in the case of the configuration described in the first embodiment. is there. In addition, as compared with the configuration described in the first embodiment, it is possible to cope with a case where the width of the river bed is wider.

(Embodiment 3)
FIG. 3 is a metal transmission type sabo dam according to Embodiment 3 of the present invention, where (a) is a front view (viewed from the downstream side), (b) is the same plan view, and (c) is ( (a) AA sectional drawing, (d) is BB sectional drawing of (a) (however, a basic part is abbreviate | omitted), (e) is B section detail drawing of (b). In the present embodiment, the same components as those in the first embodiment are given the same numbers, and detailed description thereof is omitted, and only different portions will be described in detail.

  In the present embodiment, as shown in FIGS. 3B and 3E, through holes 30a are provided at both left and right edges of the plate 30 provided on the downstream side of the leg 25, and the through holes 30a are provided. The bolts 41 are inserted through the washers 40, and the plates 30 are fastened to the extending portions 10b and 11b provided with female threads (not shown). Thereby, stability of the burden of the load by a debris flow improves more. Even when such a fastening structure is adopted, the left and right ends of the lateral member 16 are directly fixed to the inner side surfaces 10a and 11a of the left and right non-overflow portions 10 and 11 as in the case of the first embodiment. Therefore, very large thermal expansion stress and thermal contraction stress are not generated in the transverse member 16 and the leg portion 25. Therefore, there is no fear that the transverse member 16, the leg portion 25, or the left and right non-overflow portions 10, 11 will be destroyed.

(Embodiment 4)
FIG. 4 shows a metal transmission type sabo dam according to Embodiment 4 of the present invention, where (a) is a front view (viewed from the downstream side), (b) is the same plan view, and (c) is ( (a) AA sectional drawing, (d) is BB sectional drawing of (a) (however, a basic part is abbreviate | omitted), (e) is C section detail drawing of (b). In the present embodiment, the same components as those in the first embodiment are given the same numbers, and detailed description thereof is omitted, and only different portions will be described in detail.

  As shown in FIGS. 4B and 4E, in the present embodiment, the plate 30 is disposed on the downstream side of the leg portion 25a made of a steel pipe slightly longer than the leg portion 25 shown in FIG. It is the structure which provided and the front-end | tip of the leg part 25a was embed | buried under the extension parts 10b and 11b on either side as it is. Accordingly, the left and right extending portions 10b and 11b of the non-overflow portions 10 and 11 made of concrete can be integrated with the steel portion, and, similarly to the third embodiment, the load caused by the debris flow The stability of the is further improved.

  As described above, even when the configuration in which the tip of the leg portion 25a is embedded in the left and right extending portions 10b and 11b is adopted, as in the case of the first embodiment, the left and right end portions of the lateral member 16 are Since it is not directly fixed to the inner side surfaces 10a and 11a of the non-overflow portions 10 and 11, no very large thermal expansion stress or thermal contraction stress is generated in the transverse member 16 and the leg portion 25a. Therefore, there is no fear that the transverse member 16, the leg portion 25a, or the left and right non-overflow portions 10, 11 will be destroyed.

(Embodiment 5)
FIG. 5 shows a metal transmission type sabo dam according to the fifth embodiment of the present invention, wherein (a) is a front view (viewed from the downstream side), (b) is the same plan view, and (c) is ( (a) AA sectional drawing, (d) is BB sectional drawing of (a) (however, a basic part is abbreviate | omitted), (e) is D section detail drawing of (b). In the present embodiment, the same components as those in the first embodiment are given the same numbers, and detailed description thereof is omitted, and only different portions will be described in detail.

  As shown to Fig.5 (a)-(d), 18a, 18b, 18c is the vertical member comprised by connecting the steel flanged pipe, 19 is one vertical member 18a, nine vertical members 18b, a second grid-like wall provided on the upstream side for capturing a debris flow in which one vertical member 18c and four horizontal members 16 are combined so as to intersect vertically and horizontally, and 20 is a first grid-like wall 17 is a connecting member made of a steel pipe facing the flow direction of the water channel 13 for connecting 17 and the second grid-like wall 19. Thus, since the lattice-like wall has a two-layer structure, the ability to capture gravel and driftwood at the time of debris flow generation is improved as compared with the first embodiment.

  Further, also on the lower end side of the second grid-like wall 19, a steel portion extending downward is provided at a portion (that is, a portion corresponding to the water channel 13) that is not hidden by the left and right extending portions 10 b and 11 b when viewed from the downstream side. Seven extending members 18d made of pipes are provided. The ends of the extending members 18d are fixed to the base portion 12, respectively. In the present embodiment, the example in which the extending members 15d and the extending members 18d are provided on the lower ends of the first and second lattice walls 17 and 19 has been described. However, the present invention is not limited to this. However, it is sufficient if the extending member is configured to extend downward from the lower end side of at least one of the plurality of lattice walls.

  Further, on the lower end side of the second grid-like wall 19, the vertical members 18a and 18c constituting the second grid-like wall 19 are respectively hidden at positions hidden by the left and right extending portions 10b and 11b when viewed from the downstream side. It extends in the vertical direction and downwards and also serves as an extending member. The ends of the vertical members 18a and 18c extending in the vertical direction and downward are fixed to the bottom portions 10c and 11c, respectively. Thereby, the burden capacity of the load by a debris flow improves more.

(Embodiment 6)
FIG. 6 is a metal transmission type sabo dam according to Embodiment 6 of the present invention, where (a) is a front view (viewed from the downstream side), (b) is the same plan view, and (c) is ( (a) AA sectional drawing, (d) is BB sectional drawing (however, a base part is abbreviate | omitted) of (a). In the present embodiment, the same components as those in the first embodiment are given the same numbers, and detailed description thereof is omitted, and only different portions will be described in detail.

  As shown in FIGS. 6A to 6C, 10 d has a cross-sectional shape parallel to the upper surface (XY plane) of the base portion 12 together with the inner surface side 10 a and the extension portion 10 b of the left non-overflow portion 10. The U-shaped left-side holding portion {extends in the direction crossing the water channel 13 from the inner side surface 10a and the upstream side (the Y axis plus side) of the left non-overflow portion 10 and in the vertical direction The extension portion 11d is held on the right side of the right non-overflow portion 11 along the inner side surface 11a and the extension portion 11b, and has a U-shaped cross section parallel to the top surface (XY plane) of the base portion 12. (Extending in the longitudinal direction in the direction crossing the water channel 13 from the inner side surface 11a and the upstream side (the positive side of the Y axis) of the right non-overflow portion 11).

  Since the left and right end portions of the first grid-like wall 17 are accommodated in the left and right holding portions having a U-shaped cross section as described above, the location where the plate 30 contacts the extending portions 10b and 11b You can prevent the earth and sand from hitting directly.

  In the first to sixth embodiments, the vertical and horizontal members constituting the connecting member, the extending member, the legs, and the lattice wall are relatively light and have the same resistance regardless of the direction in which the load acts. The case of a steel pipe having a circular cross section has been described, but the present invention is not necessarily limited thereto. For example, various metal rod-shaped members such as solid bars and square pipes (in this specification, solid bodies, pipes, and the like are referred to as rod-shaped members) can be used.

10, 11: Left and right non-overflow portions 10a, 11a: Left and right inner surface sides 10b, 10d, 11b, 11d: Extension portions 10c, 11c: Bottom portion 12: Base portion 13 : Water channels 15a, 15b, 15c, 18a, 18b, 18c: longitudinal members 15d, 18d: extending members 16: transverse members 17, 19: first and second lattice-like walls 20, 52, 62, 72: connecting members 25, 25a: Leg 30: Plate 30a: Through hole 40: Washer 41: Bolt 50, 51, 60, 61, 70, 71: Diagonal material

Claims (12)

A water channel is formed surrounded by the left and right non-overflow sections (hereinafter referred to as “both non-overflow sections”) and the foundation provided between the non-overflow sections, and a plurality of metal A metal transmission type sabo dam provided so that grid-like walls combined so that rod-shaped members intersect vertically and horizontally cross the water channel,
Each inner surface side facing the water channel of the non-overflow portions has a holding portion for holding both ends of the lattice wall,
A plurality of metal rod-like extending members extending downward (hereinafter referred to as “extending members”) are provided on the lower end side of the lattice wall,
Each distal end of the extending member that is not hidden by both holding portions when viewed from the downstream side of the plurality of extending members is fixed to the base portion,
In order to suppress the deformation of the lattice wall due to the debris flow captured by the lattice wall, a metal support member (hereinafter referred to as “diagonal material) extending obliquely upward from the downstream side of the base portion toward the lattice wall. ), And this diagonal member is fixed to the lattice wall.   2. The metal transmission according to claim 1, wherein a plurality of diagonal members are provided while being spaced apart from the base portion upward in a plane perpendicular to the upper surface of the base portion and parallel to the flow of the water channel. Type sabo dam.   3. The metal transmission type sabo according to claim 2, wherein at least the uppermost diagonal member of the plurality of diagonal members is connected to the grid wall by a connecting member facing a flow direction of the water channel. dam.   The metal transmission type sabo dam according to claim 2 or 3, wherein a plurality of sets of the diagonal members are provided toward the lattice wall.   In order to transmit the load due to the debris flow captured by the lattice wall to the both holding portions, the downstream side portions of both ends of the lattice wall hidden by the both holding portions when viewed from the downstream side The plurality of legs are respectively provided so as to face the flow direction, and the plurality of legs are respectively held by the both holding portions. Metal transmission sabo dam.   The metal transmission according to claim 5, wherein plates are provided on the downstream sides of the plurality of legs, respectively, and are in contact with or fixed to the holding portions via the plates. Type sabo dam.   The metal transmission type sabo dam according to claim 6, wherein the plate has a through hole, a bolt is inserted into the through hole, and the plate is fastened to a holding portion having a female screw portion.   The metal transmission type sabo dam according to claim 5 or 6, wherein the downstream ends of the plurality of leg portions are embedded in the holding portion.   9. The metal transmission-type sabo dam according to claim 1, wherein a cross-sectional shape parallel to the upper surface of the base portion of the holding portion is L-shaped.   There are a plurality of grid walls, and the plurality of grid walls are connected by a connecting member facing the flow direction of the water channel, and extend downward to the lower end side of at least one of the plurality of grid walls. The metal transmission type sabo dam according to any one of claims 1 to 9, wherein a plurality of extending members are provided.   The metal transmissive sabo dam according to any one of claims 1 to 6, wherein a cross-sectional shape parallel to the upper surface of the base portion of the holding portion is a U-shape.   There are a plurality of grid walls, and the plurality of grid walls are connected by a connecting member facing the flow direction of the water channel, and extend downward to the lower end side of at least one of the plurality of grid walls. The metal transmission type sabo dam according to claim 11, wherein a plurality of extending members are provided.