JP5204065B2 - Metal transmission type sabo dam - Google Patents

Description

  In the present invention, even in a structure in which a non-overflow portion made of concrete and a lattice wall made of metal are combined, buckling does not occur in the metal lateral member due to expansion due to thermal stress, and simple construction is possible. It relates to a possible metal transmission type sabo dam.

  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.

  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. A large number of longitudinal members transmit these loads to the ground.

  In addition, concrete sabo dams on both the left and right banks and waterways to both these non-overflow areas are suitable for permeable sabo dams, particularly suitable for narrow areas such as debris flow hazardous mountain areas. A steel transmission type sabo dam composed of a horizontal member made of a steel pipe fixed so as to cross the wall and a plane lattice-like wall in which vertical members are combined has been proposed (for example, see Patent Document 1). .

  In addition, it is provided so as to cross the water channel between the non-overflowing parts made of concrete provided on both the left and right banks, the sheath pipe embedded on the inner side of these non-overflowing parts, and both non-overflowing parts. There is also proposed a steel transmission sabo dam that includes a horizontal member made of steel and a slit wall made of a vertical member, and is configured to insert the end of the horizontal member into a sheath pipe (for example, Patent Document 2). See).

JP 2008-266981 A JP 2007-277972 A

  However, in the steel transmission type sabo dam disclosed in the above-mentioned Patent Document 1, since the transverse member made of a steel pipe is simply embedded and fixed in the non-overflow portion made of concrete provided on both the left and right banks, There was a problem that the transverse member buckled due to expansion due to stress.

  Moreover, in the steel transmission type sabo dam disclosed in Patent Document 2, a construction in which a sheath pipe is embedded in advance in a concrete non-overflow portion in order to avoid thermal stress caused by expansion and contraction of the transverse member. There was also a difficulty that had to be carried out.

  The object of the present invention is to prevent the buckling of the metal transverse member due to expansion due to thermal stress even in a structure in which the non-overflow portion made of concrete and the metal lattice-like wall are combined. The object is to provide a metal permeable sabo dam that can be constructed.

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 portions and the base portion provided between the left and right non-overflow portions, and a plurality of metal rod-shaped members are combined so as to intersect vertically and horizontally. A metal transmission type sabo dam provided so that a lattice wall crosses the waterway,
A holding part for holding the lattice wall is formed on the inner surface side of the non-overflow parts facing the water channel,
A plurality of metal rod-like extending members (hereinafter referred to as “extending members”) extending in the vertical direction and downward are provided on the lower end side of the lattice-like wall,
Each distal end of the extending member that is not hidden by the both holding portions when viewed from the downstream side of the plurality of extending members is fixed to the base portion,
In the downstream part of the grid wall hidden by the both holding portions when viewed from the downstream side, the flow direction of the water channel is used to transmit the load due to the debris flow captured by the grid wall to the both holding portions. It is a metal transmission type sabo dam characterized by having a plurality of legs provided so as to face each other.

The invention according to claim 2 is the invention according to claim 1,
The plurality of grid walls have a plurality of grid walls connected by a connecting member facing the flow direction of the water channel, and at least one of the plurality of grid walls has a vertical direction on the lower end side. A plurality of extending members extending downward are provided.

The invention according to claim 3 is the invention according to claim 1 or 2,
The holding portion includes a first extending portion extending in the longitudinal direction in the direction crossing the water channel from the inner surface side and the downstream side of the non-overflow portion, and a lower end side in the longitudinal direction of the first extending portion. And a bottom portion extending toward the upstream side.

The invention according to claim 4 is the invention according to claim 3,
It has the 2nd extension part extended in the vertical direction and upper direction from the upstream of the bottom part, It is characterized by the above-mentioned.

The invention according to claim 5 is the invention according to claim 3 or 4,
A plate for contacting the first extending portion is provided on the downstream side of the leg portion.

The invention according to claim 6 is the invention according to claim 5,
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 7 is the invention according to claim 3 or 4,
The tip of the leg part on the downstream side is embedded in the first extension part.

As described above, according to the metal transmission type sabo dam according to the present invention,
A water channel is formed surrounded by the left and right non-overflow portions and the base portion provided between the left and right non-overflow portions, and a plurality of metal rod-shaped members are combined so as to intersect vertically and horizontally. A metal transmission type sabo dam provided so that a lattice wall crosses the waterway,
A holding part for holding the lattice wall is formed on the inner surface side of the non-overflow parts facing the water channel,
A plurality of metal rod-like extending members (hereinafter referred to as “extending members”) extending in the vertical direction and downward are provided on the lower end side of the lattice-like wall,
Each distal end of the extending member that is not hidden by the both holding portions when viewed from the downstream side of the plurality of extending members is fixed to the base portion,
In the downstream part of the grid wall hidden by the both holding portions when viewed from the downstream side, the flow direction of the water channel is used to transmit the load due to the debris flow captured by the grid wall to the both holding portions. Because it is a configuration with multiple legs each facing the
Even in a structure where a non-overflow section made of concrete and a metal grid wall are combined, the metal cross member does not buckle due to expansion due to thermal stress, and it can be easily constructed A transmission type sabo dam can be realized.

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 B section detailed 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 C section detail 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 D 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).

  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 of (a), (d) is BB sectional drawing of (a), (e) is 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. It is defined as the + direction of the Y axis shown.

  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 is an inner side surface 10a of the left non-overflow portion 10. And the extension part 10c which comprises the holding part extended in the direction which crosses the water channel 13 from the downstream side (minus side of a Y-axis) and the vertical direction is the vertical direction lower end side (Z-axis) of the extension part 10b. The bottom portion 11b constituting the holding portion extending from the minus side of the non-overflow portion toward the upstream side (the plus side of the Y-axis) crosses the water channel 13 from the inner side surface 11a of the right non-overflow portion 11 and the downstream side. The extending portion 11c constituting the holding portion extending in the vertical direction and in the vertical direction, 11c of the extending portion 11b 15a, 15b, 15c is a vertical member formed by connecting a steel flanged pipe, and 16 is a steel flanged pipe. A horizontal member 17 connected to each other, 17 is a debris flow in which one vertical member 15a, nine vertical members 15b, one vertical member 15c, and four horizontal members 16 are combined so as to intersect vertically and horizontally. The first grid wall 25 provided on the downstream side to be captured is a left and right side 25 as viewed from the downstream side in order to transmit the load caused by the debris flow captured by the first grid wall 17 to the extending portions 10b and 11b. Four legs each provided on the first grid-like wall 17 hidden by the extending parts 10b and 11b so as to face the flow direction of the water channel 13 (minus direction of the Y axis), 30 is downstream of the leg part 25 The extension parts 10b and 11b A plate provided for.

  In addition, on the lower end side of the first grid-like wall 17, a portion that is not hidden by the left and right extending portions 10 b and 11 b when viewed from the downstream side (that is, a portion corresponding to the water channel 13) is vertically and downward (Z Seven extending members 15d made of steel pipes extending in the negative direction of the shaft 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 in the vertical direction and downwards and also serves as an extending member. The ends of the vertical members 15a and 15c extending downward in the vertical direction are fixed to the bottom portions 10c and 11c, respectively.

  As can be seen from FIGS. 1 (a) and 1 (b), the distal ends of the vertical members 15a and 15c and the distal end of the extending member 15d are fixed to the bottom portions 10c and 11c and the base portion 12, respectively. Since the plates 30 provided on the abutment are respectively in contact with the extending portions 10b and 11b, gravel and driftwood can be efficiently captured when debris flow occurs, and the load from the debris flow is applied to the bottom portions 10c and 11c, the base portion 12 and the The parts 10b and 11b can be distributed 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 worry of destroying the left and right non-overflow sections 10 and 11.

(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), (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. 2B and 2E, through holes 30a are provided on 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. However, the absorption effect of the energy of expansion and contraction in the transverse member 16 and the leg portion 25 itself is maintained. Therefore, there is no worry of destroying the left and right non-overflow portions 10 and 11.

(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 of (a), (d) is BB sectional drawing of (a), (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. 3B and 3E, 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 in right and left extension part 10b, 11b as it is. Therefore, not only can the left and right extension portions 10b and 11b of the concrete non-overflow portions 10 and 11 be integrated with the steel portion, but the load of the load due to the debris flow is the same as in the second embodiment. The stability of the is further improved.

  Thus, even when the configuration in which the tip of the leg portion 25 is embedded in the left and right extending portions 10b and 11b is adopted, the left and right end portions of the lateral member 16 are left and right as in the case of the first embodiment. Since it is not directly fixed to the inner side surfaces 10a and 11a of the non-overflow portions 10 and 11, the absorption effect of the expansion and contraction energy in the transverse member 16 and the leg portion 25 itself is maintained. Therefore, there is no worry of destroying the left and right non-overflow portions 10 and 11.

(Embodiment 4)
4A and 4B show a metal transmission type sabo dam according to Embodiment 4 of the present invention, in which FIG. 4A is a front view (viewed from the downstream side), FIG. (a) AA sectional drawing, (d) is BB sectional drawing of (a), (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 in FIGS. 4A to 4D, 18a, 18b and 18c are vertical members formed by connecting steel flanged pipes, and 19 is one vertical member 18a and 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, on the lower end side of the second grid-like wall 19, it extends in the vertical direction and downward in a portion that is not hidden by the left and right extending portions 10 b and 11 b when viewed from the downstream side (that is, a portion corresponding to the water channel 13). Seven extending members 18d made of steel pipes are provided. The ends of the extending members 18d are fixed to the base portion 12, respectively. Instead of the seven extending members 18d being provided, the seven extending members 15d are eliminated. It suffices if the extending member is configured to extend vertically and downward to 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 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). 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. 5 (a) to 5 (c), an extending portion 10 b extending in the direction crossing the water channel 13 from the inner side surface 10 a and the downstream side of the left non-overflow portion 10 and in the vertical direction; A bottom portion 10c extending from the lower end in the longitudinal direction toward the upstream side of the extending portion 10b and an extending portion 10d extending from the bottom portion 10c in the vertical direction and upward (in the positive direction of the Z axis) are provided. The groove is configured. Further, an extension part 11b extending in the direction crossing the water channel 13 from the inner side surface 11a and the downstream side of the right non-overflow part 11 and upstream from the lower end side in the vertical direction of the extension part 11b. A bottom portion 11c extending toward the side and an extending portion 11d extending from the bottom portion 11c in the vertical direction and upward are provided, and these constitute a right groove.

  Since the left and right ends of the first grid-like wall 17 are accommodated in the left and right grooves, the earth and sand can be prevented from directly hitting the place where the plate 30 contacts the extending portions 10b and 11b.

  In the first to fifth 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 walls 20: connecting members 25, 25a: legs 30: Plate 30a: Through hole 40: Washer 41: Bolt

Claims (7)

A water channel is formed surrounded by the left and right non-overflow portions and the base portion provided between the left and right non-overflow portions, and a plurality of metal rod-shaped members are combined so as to intersect vertically and horizontally. A metal transmission type sabo dam provided so that a lattice wall crosses the waterway,
A holding part for holding the lattice wall is formed on the inner surface side of the non-overflow parts facing the water channel,
A plurality of metal rod-like extending members (hereinafter referred to as “extending members”) extending in the vertical direction and downward are provided on the lower end side of the lattice-like wall,
Each distal end of the extending member that is not hidden by the both holding portions when viewed from the downstream side of the plurality of extending members is fixed to the base portion,
In the downstream part of the grid wall hidden by the both holding portions when viewed from the downstream side, the flow direction of the water channel is used to transmit the load due to the debris flow captured by the grid wall to the both holding portions. A metal transmission type sabo dam with a plurality of legs provided to face each other.   The plurality of grid walls have a plurality of grid walls connected by a connecting member facing the flow direction of the water channel, and at least one of the plurality of grid walls has a vertical direction on the lower end side. The metal transmission type sabo dam according to claim 1, wherein a plurality of extending members extending downward are provided.   The holding portion includes a first extending portion extending in the longitudinal direction in the direction crossing the water channel from the inner surface side and the downstream side of the non-overflow portion, and a lower end side in the longitudinal direction of the first extending portion. The metal transmission type sabo dam according to claim 1 or 2, further comprising a bottom portion extending toward the upstream side.   The metal transmission type sabo dam according to claim 3, further comprising a second extending portion extending vertically and upward from the upstream side of the bottom portion.   The metal transmission type sabo dam according to claim 3 or 4, wherein a plate for contacting the first extension portion is provided on the downstream side of the leg portion.   6. The metal transmission type sabo dam according to claim 5, wherein 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 metal transmission type sabo dam according to claim 3 or 4, wherein the downstream end of the leg portion is embedded in the first extension portion.

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