JP7118709B2 - Weirs and traps - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dam installed in a river or the like and a capture body provided on the dam.

Sabo dams are known for preventing sediment-related disasters in mountain streams and the like. As shown in FIG. 6, the conventional erosion control dam 100 has a pair of non-overflow parts (sleeves) 110 that block overflows such as debris flows flowing from the upstream side, and a pair of non-overflow parts (sleeves) 110. and a capturing body 130 formed of a steel pipe and provided in the transmitting portion 120 .

JP 2014-173232 A

By the way, in a river where a disaster such as a debris flow has occurred, sediment and the like may continue to flow from upstream to downstream for a predetermined period of time, for example, several days to several years after the occurrence of the disaster. The flowing earth and sand could not be caught by the catcher in the permeable part of the dam and deposited on the downstream side of the river. For this reason, there have been requests for dams to dam earth and sand from upstream after a disaster occurs.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a dam that can dam earth and sand and prevent the earth and sand from passing through the permeable part.

In order to solve the above problems, the present invention has an upstream wall portion facing upstream and a downstream wall portion facing downstream, a pair of sleeve portions extending from both banks of a river, and the pair of and an impermeable wall portion detachably provided on the upstream wall portion of the sleeve portion to cover the opening on the upstream side of the permeable portion and block earth and sand. , is provided.

In addition, the impermeable wall portion includes a plurality of horizontal beam members that span the pair of sleeve portions at predetermined intervals in the height direction on the upstream wall portion side, and the horizontal beam members at predetermined intervals. It is preferable to have a plurality of vertical beam members provided to intersect the vertical beam members, and a wall surface member attached between the vertical beam members.

In addition, it is preferable that the permeation section is provided with a capture body that captures an object flowing from the upstream and causes the running water to flow. A supporting member having one end fixed to the impermeable wall portion and the other end fixed to the capturing body is provided, and the supporting member extends downward from the impermeable wall side toward the capturing body. is preferably slanted to

The pair of non-overflow portions has a side wall portion extending between the upstream wall portion and the downstream wall portion, and the capturing body has one end fixed to the permeable portion, and the trapping body is fixed to the permeable portion, and the trapping body is downstream as it goes upward. a first leg inclined to the side, and a second leg having one end fixed to the transmission part and the other end fixed to the first leg, and inclined upstream as it goes upward. a plurality of pillars, a plurality of beams connecting the pillars, one end fixed to the pillar, the other end fixed to the side wall, and the pair of sleeves and the catcher It is preferable to provide a connecting portion that connects the and.

Moreover, it is preferable that the pillar portion has a fixing portion that fixes one end of the connecting portion, and the side wall portion has an accommodating portion that accommodates the other end of the connecting portion.

Furthermore, in order to solve the above problems, the present invention provides an upstream wall facing upstream, a downstream wall facing downstream, and a side wall extending between the upstream wall and the downstream wall. and a pair of non-overflow parts extending from both banks of a river, and a permeable part that allows flowing water to pass between the pair of non-overflow parts, provided in the permeable part a first leg that is fixed to the permeable part at one end and inclined downstream as it goes upward; a plurality of pillars having a second leg fixed to the transmission part, the other end fixed to the first leg, and inclined upstream as it goes upward; and a plurality of connecting the pillars. and a connecting portion having one end fixed to the pillar and the other end fixed to the side wall to connect the pair of sleeves and the capture body. .

ADVANTAGE OF THE INVENTION According to this invention, the earth and sand can be dammed up, and it can suppress that earth and sand pass through a permeation|transmission part.

It is the perspective view which looked at the sabo dam which concerns on one embodiment from the upstream. It is the top view which looked at the permeation|transmission part in a sabo dam. It is a front view of a capture body for explaining the capture body. It is the figure which looked at the permeation|transmission part in a sabo dam from the side. It is the figure which looked at the permeation|transmission part in the sabo dam which concerns on other embodiment from the side. It is the figure which looked at the conventional sabo dam from the upstream.

[Sabo dam structure]
An embodiment of the sabo dam will be described with reference to FIGS. 1 to 4. FIG. FIG. 1 is a perspective view of the sabo dam viewed from the upstream side. FIG. 2 is a top plan view of the transmissive portion of the erosion control dam, with the crown protection member partially removed. FIG. 3 is a front view of the trapping body for explaining the trapping body, and the impermeable wall portion is not shown. FIG. 4 is a side view of the permeable part of the erosion control dam.
The erosion control dam (dam) 1 includes a pair of non-overflow portions (sleeves) 10 protruding from both banks of the river toward the center of the river, and a permeable portion 20 formed between the non-overflow portions 10. , a trapping body 30 provided in the permeable section 20, and an impermeable wall section 40 covering the opening of the permeable section 20 on the upstream side.

<Non-overflow part>
The pair of non-overflow parts 10 are provided on the foundation concrete 11 to prevent the overflow of the debris flow flowing from the upstream side of the river. The non-overflow portion 10 has an upstream wall portion 12 , a downstream wall portion 13 , a side wall portion 14 and a crown protection member 15 .
In the space surrounded by the upstream wall portion 12, the downstream wall portion 13, the side wall portion 14, and the crown protection member 15, the locally generated earth and sand generated when the foundation concrete 11 is installed, and cement/cement milk are removed. The filling material 16, which is a soil cement manufactured by stirring and kneading, is placed. Due to the solidification of the filling material 16, the weight of the filling material 16 receives the impact of the debris flow.

(upstream wall)
The upstream wall portion 12 faces the upstream of the river, is a wall portion that receives the impact of running water and debris flow from the upstream, and is adjacent to the bank of the river.
The upstream wall portion 12 is constructed by connecting a plurality of rectangular plate-like steel panels each having a corrugated cross section. The steel panels are connected to each other by bolts and nuts, and sealing tape or the like may be applied to the joints to stop water. The steel panels forming the upstream wall portion 12 are each formed in a corrugated shape, but the entire wall portion is formed in a substantially flat shape when viewed as a whole. The upstream wall portion 12 is constructed so as to form a slope sloped downward toward the upstream side from the upper end to the lower end.
Predetermined mounting portions (not shown) are formed at a plurality of locations on both upstream wall portions 12 at positions to which horizontal beam members 41 of the impermeable wall portion 40 to be described later are mounted. The attachment portion may be, for example, a bolt or the like attached to the steel panel.

(downstream wall)
The downstream wall portion 13 faces the downstream side of the river, is arranged at a predetermined distance from the upstream wall portion 12, and is adjacent to the bank of the river.
The downstream wall portion 13 is constructed by connecting a plurality of rectangular plate-like steel panels each having a corrugated cross section. The steel panels are connected to each other by bolts and nuts, and sealing tape or the like may be applied to the joints to stop water. The steel panels forming the downstream wall portion 13 are each formed in a corrugated shape, but the entire wall portion is formed in a substantially flat shape when viewed as a whole.
The downstream wall portion 13 is constructed so as to slope downward toward the downstream side from the upper end to the lower end. In addition, the downstream wall part 13 may replace with a steel panel and may use a concrete panel.

(side wall)
The side wall portion 14 faces the permeable portion 20 and extends between the upstream wall portion 12 and the downstream wall portion 13 in the river flow direction. The side wall portion 14 is constructed by connecting a plurality of rectangular plate-like steel panels each having a corrugated cross section. The steel panels are connected to each other by bolts and nuts, and sealing tape or the like may be applied to the joints to stop water. The steel panels forming the side wall portion 14 are each formed in a corrugated shape, but the entire wall portion is formed in a substantially flat shape when viewed as a whole. The side wall portion 14 is constructed so as to stand upright on the upper surface of the foundation concrete 11 .
A connection portion of the side wall portion 14 that is continuous with the upstream wall portion 12 is formed as a curved portion 14a. Since the curved portion 14a has a curved surface, for example, when the impermeable wall portion 40 is not constructed and a huge rock or driftwood collides with it, the curved portion 14a is less likely to be damaged. When a debris flow or the like flows into the transmission section 20, a vortex flow is less likely to occur.
A concave portion (accommodating portion) 14b, for example, is formed in a portion of the side wall portion 14 that accommodates a connecting portion 33 of a capture body 30, which will be described later. The recess 14 b is formed by cutting and removing the steel panel of the side wall 14 and removing the filling material 16 .

(top protection material)
The crown protection member 15 covers the upper surface of the placed filling member 16 and is made of concrete. The crown protection member 15 functions as a protective layer (water blocking layer) for the filling member 16 .

<Transmission part>
The permeable portion 20 is provided between the pair of non-overflow portions 10 and allows the running water to pass therethrough. The transmission section 20 has a base concrete 21 provided at the bottom of the river.

<Capture body>
The trapping body 30 is installed on the foundation concrete 21 of the transmitting part 20 and is formed as a railing made of steel pipes or steel or concrete columns. The trapping body 30 allows river water and small earth and sand to pass through, and traps huge rocks and driftwood when a debris flow occurs.
The trapping body 30 has a plurality of pillars 31 , beams 32 spanning between the pillars 31 , and connecting portions 33 that connect the trapping body 30 to the side wall portion 14 of the non-overflow portion 10 .
The column portion 31 has a first leg portion 31a which is embedded in the basic concrete 21 at one end and inclined downstream toward the other end (upward), and a first leg portion 31a which is embedded in the basic concrete 21 at one end and has the other end ( upward) and two second legs 31b inclined upstream. The two second legs 31b are provided at a predetermined distance from each other in the river flow direction, and the other end of each second leg 31b is connected to the first leg 31a. there is The two second legs 31b are connected to each other by steel pipes.
The first leg portion 31a has a fixing portion (not shown) to which a connecting portion 33 (to be described later) is fixed in the vicinity of its upper end. The fixed portion is provided at the position of the first leg portion 31 a facing the side wall portion 14 of the non-overflow portion 10 .
A plurality of beams 32 are provided at predetermined intervals in the height direction of the capture body 30 .

The connecting portions 33 are provided between the column portions 31 provided at both ends in the width direction among the plurality of column portions 31 and the side wall portions 14 of the respective non-overflow portions 10, and connect the capture bodies 30 to the non-overflow portions. connected to 10. The connecting portion 33 is formed of, for example, a steel pipe, one end of which is detachably attached to the fixing portion of the first leg portion 31a by, for example, a bolt and a nut, and the other end of which is a concave portion 14b of the side wall portion 14. and fixed to the non-overflow portion 10 by, for example, soil cement or the like. The connecting portion 33 is located at the same height position as the uppermost beam portion 32 in the height direction of the capture body 30 .

<Impermeable wall part>
The impermeable wall part 40 is provided to cover the opening on the upstream side of the permeable part 20, and in the impermeable state, it blocks the running water and earth and sand from the front.
The impermeable wall portion 40 has horizontal beam members 41 , vertical beam members 42 , wall surface portions 43 , and support members 44 . The horizontal beam member 41 is made of H-shaped steel and spans the transmission part 20 of the dam 1 . Specifically, the horizontal beam member 41 spans from one upstream wall portion 12 to the other upstream wall portion 12 so as to traverse the transmitting portion 20 .
A plurality of horizontal beam members 41 are provided at predetermined intervals in the height direction of the dam 1, and can be detachably attached to a predetermined mounting portion of the upstream wall portion 12 on one side of a pair of H steel flange portions. installed. Specifically, one of the flange portions is formed with a hole through which a bolt is inserted, which is an attachment portion of the upstream wall portion 12. By fitting a nut to the bolt, the horizontal beam member 41 is attached to the upstream wall portion. Attached to portion 12 . Therefore, the horizontal beam member 41 is detachably attached to the upstream wall portion 12 .
Further, one flange portion of the horizontal beam member 41 is formed with a plurality of holes to which one end of a support member 44 to be described later is attached. A hole (not shown) is formed in the other flange portion of the horizontal beam member 41 at a position overlapping with the vertical beam member 42 to be described later.

A plurality of vertical beam members 42 are provided at predetermined intervals in the width direction of the dam 1, and are formed of H-shaped steel. The vertical beam members 42 are provided to extend in the vertical direction so as to intersect the plurality of horizontal beam members 41 that are bridged over. A hole is formed in one of the pair of flange portions of the vertical beam member 42 so as to overlap a hole formed in the other flange portion of the horizontal beam member 41 . A hole formed in one flange portion of the vertical beam member 42 is aligned with a hole formed in the other flange portion of the horizontal beam member 41, a bolt is inserted, and a nut is fitted to the bolt to form a vertical beam member. 42 is attached to the horizontal beam member 41 . Therefore, the vertical beam member 42 is detachably attached to the horizontal beam member 41 .
The other flange portion of the vertical beam member 42 is formed with a plurality of holes along the longitudinal direction through which bolts or the like are inserted for attaching a wall surface member 43a (to be described later) to the vertical beam member 42 .

The wall surface portion 43 is formed of a plurality of rectangular plate-like wall surface materials (wall surface plates) 43a each having a corrugated cross section. A plurality of wall members 43a are inserted between the adjacent vertical beam members 42, and are detachably attached to the other flange portion of the vertical beam member 42 at both ends in the width direction. Although only one wall member 43a is shown between the pair of vertical beam members 42 in FIG.
The wall surface material 43a has a plurality of holes formed along the longitudinal direction at both ends thereof in the width direction, for attaching the wall surface material 43a to the vertical beam members 42, for example, through which bolts or the like are inserted. By aligning a plurality of holes at both ends in the width direction of the wall surface material 43a with holes formed in the other flange portion of the vertical beam material 42, inserting bolts, and fitting nuts to the bolts, the wall surface material 43 a is attached to the vertical beam member 42 . Therefore, the wall surface material 43a is detachably attached to the vertical beam material 42. As shown in FIG.
A plurality of wall members 43a are attached between the longitudinal beam members 42, and the wall members 43a form a wall surface portion 43 so that the transmission portion 20 is completely hidden when the dam 1 is viewed from the front.
The wall surface portion 43 is separated from the permeable portion 20 by at least the horizontal beam member 41, and in the dam 1 provided with the impermeable wall portion 40, most of the sediment flowing from upstream to downstream is While damming, water flows from the sides and below the impermeable wall portion 40 to the permeable portion 20 .
For example, a plate material (not shown) similar to the wall surface material 43a may be provided to prevent the intrusion of running water and earth and sand into the transmission section 20 from the side and below.

The support member 44 is made of a steel pipe. The support member 44 is provided between the impermeable wall portion 40 and the trapping body 30, one end is fixed to the horizontal beam member 41 of the impermeable wall portion 40, and the other end is attached to each column portion of the trapping body 30. 31 is fixed.
One end of the support member 44 has a flange portion in which a plurality of holes are formed. The support member 44 is detachably attached to the horizontal beam member 41 by fitting a nut to the support member 44 . The other end of the support member 44 is detachably fixed to the first leg portion 31a of each column portion 31. As shown in FIG.
A plurality of support members 44 are provided in the height direction and the width direction between the impermeable wall portion 40 and the capture body 30 . The support member 44 extends obliquely downward from the impermeable wall portion 40 toward the capture body 30, and a plurality of support members 44 are fixed to one column portion 31 in a line in the height direction.

<Installation of impermeable walls>
Next, the construction process of the impermeable wall will be described. For example, when a disaster such as a debris flow occurs, the trapping body 30 of the permeable dam 1 captures debris and the like flowing from upstream. After the disaster, debris such as debris is removed from the capture body 30 . In rivers where disasters such as debris flows have occurred, sediment may flow from upstream to downstream after the disaster. The sediment that has been washed away may accumulate on the downstream side, and it is desirable to prevent this sediment from flowing downstream and accumulating.

The upstream wall portion 12 of the dam 1 is provided with attachment portions (for example, bolts) to which the horizontal beam members 41 are attached. First, the horizontal beam member 41 can be attached to each upstream wall portion 12 of the pair of non-overflow portions 10 so as to cross the transmission portion 20 . Specifically, the horizontal beam member 41 spans both upstream wall portions 12 so as to traverse the transmitting portion 20, and bolts of the upstream wall portion 12 are inserted through holes in one flange portion of the horizontal beam member 41. Install the nut.
After a plurality of horizontal beam members 41 are bridged over the height direction, vertical beam members 42 are attached to the horizontal beam members 41 so as to intersect the horizontal beam members 41 . Specifically, the hole of one flange portion of the vertical beam member 42 and the hole of the other flange portion of the horizontal beam member 41 are aligned, the bolt is inserted, and the nut is attached.
Next, the wall material 43a is inserted between the adjacent vertical beam members 42 and attached to the vertical beam members 42. As shown in FIG. The wall surface material 43a is formed by aligning a plurality of holes formed along the longitudinal direction at both ends in the width direction with predetermined holes formed in the other flange portion of the longitudinal beam material 42, and bolts and nuts. It is attached. The wall surface portion 43 is formed by attaching a plurality of wall surface members 43a in the height direction and the width direction.
After forming the impermeable wall portion 40 , a support member 44 is attached between the impermeable wall portion 40 and the capture body 30 . A flange portion at one end of the support member 44 is attached to one flange portion of the horizontal beam member 41 with bolts and nuts, and the other end is detachably attached by a predetermined method.
As a result, the dam 1 having the impermeable wall portion 40 as shown in FIG. 1 is completed.

With the dam 1 as described above, the impermeable wall portion 40 can be easily installed according to the conditions of the river. The impermeable wall part 40 covers the upstream opening of the permeable part 20 with the wall material 43a, dams up the earth and sand, and effectively suppresses the earth and sand from passing through the permeable part 20 and flowing to the downstream side. be able to.

The horizontal beam member 41 constituting the impermeable wall portion 40 is attached to the upstream wall portion 12 of the non-overflow portion 10, the vertical beam member 42 is attached to the horizontal beam member 41, the wall surface member 43a is attached to the vertical beam member 42, and the supporting member. 44 are detachably attached to the trapping body 30 and the impermeable wall portion 40, respectively. It can be a permeable dam.

In addition, since the impermeable wall portion 40 is supported by the trapping body 30 via the support member 44, the structural strength is increased, and even when an excessive external force is applied to the wall portion 43, it is sufficient. can withstand. Since the support member 44 is inclined downward from the impermeable wall portion 40 toward the capturing body 30 , the load applied to the impermeable wall portion 40 acts in the direction of pressing the capturing body 30 against the foundation concrete 21 . Thus, the load applied to the impermeable wall portion 40 can be received by the dam 1 as a whole.

In addition, in the dam 1, the capture body 30 has a fixed portion to which one end of the connecting portion 33 is attached to the first leg portion 31a, and the non-overflow portion 10 has a concave portion 14b for accommodating the other end of the connecting portion 33. Therefore, the trapping body 30 can be easily integrally connected to the non-overflow portion 10, and the existing trapping body 30 can be connected to the non-overflow portion 10 via the connecting portion 33. can be retrofitted.
By integrally connecting the trapping body 30 to the non-overflow portion 10, the structural strength of the trapping body 30 is increased, and the structural strength of the dam 1 is also increased. The dam 1 can receive the components of the excess external force applied to the impermeable wall portion 40 and transmitted through the support member 44 not only at the capture body 30 but also at the dam 1 as a whole.

<Others>
It should be noted that the present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the present invention. For example, as shown in FIG. 4, in the above embodiment, the impermeable wall portion 40 was provided so as to completely cover the transmissive portion 20. However, as shown in FIG. If it is not necessary to cover the whole, the uppermost horizontal beam member 41 may be installed in the middle of the height of the transmission part 20 to partially cover the transmission part 20 to form the partially transparent dam 1. good.

Moreover, although the dam 1 is provided with the impermeable wall portion 40 in the above embodiment, the dam may be provided without the impermeable wall portion 40 . In this case, the dam is a permeable dam, but since the trapping body 30 is integrally connected to the non-overflow portion 10 via the connecting portion 33, the impact resistance when trapping driftwood, debris, etc. is improving.

In the above embodiment, the connecting portion 33 is at the same height position as the uppermost beam portion 32 in the height direction of the capture body 30 . However, if the connecting portion 33 connects the trapping body 30 and the non-overflow portion 10, even if it is provided at the same height position as the beam portion 32 other than the uppermost stage, the column portion 31 of the trapping body 30 does not move. It may be provided at any position. Furthermore, a plurality of connecting portions 33 may be provided along the height direction of the capture body 30 .

Further, one end of the support member 44 is attached to the horizontal beam member 41 in the above embodiment, but may be attached to the vertical beam member 42 .

1 dam 10 non-overflow part (sleeve)
12 upstream wall portion 13 downstream wall portion 14 side wall portion 14b recess (accommodating portion)
20 transmission part 30 capture body 31 column part 32 beam part 33 connection part 40 impermeable wall part 41 horizontal beam material 42 vertical beam material 43 wall surface part 43a wall surface material 44 support material

Claims (7)

a pair of sleeves extending from both banks of the river, each having an upstream wall facing the upstream side and a downstream wall facing the downstream side;
a permeable part for passing running water between the pair of sleeves;
an impermeable wall portion that is detachably provided on the upstream wall portion of the sleeve portion, covers an opening on the upstream side of the permeable portion, and blocks earth and sand;
with
The impermeable wall portion
a plurality of horizontal beam members bridged over the pair of sleeve portions on the upstream wall side at predetermined intervals in the height direction;
a plurality of vertical beam members intersecting the horizontal beam members at predetermined intervals;
a wall material attached between the longitudinal beams;
A dam characterized by having 2. The weir according to claim 1, further comprising a trapping body for trapping an object flowing from upstream in said permeation section and for allowing flowing water to flow. a support having one end fixed to the impermeable wall and the other end fixed to the trap;
The dam according to claim 2 , wherein the supporting member is inclined downward from the impermeable wall side toward the capturing body. the pair of sleeves have side walls extending between the upstream wall and the downstream wall;
The capture body is
A first leg fixed at one end to the permeable part and inclined downstream as it goes upward, and a first leg fixed to the permeable part and the other end fixed to the first leg, upward a plurality of pillars having a second leg that slopes upstream as it goes;
a plurality of beams connecting the pillars;
a connecting portion having one end fixed to the column portion and the other end fixed to the side wall portion to connect the pair of sleeve portions and the capture body;
The dam according to claim 2 or 3 , characterized by comprising: The pillar portion has a fixing portion that fixes one end of the connecting portion,
The dam according to claim 4 , wherein the side wall portion has an accommodating portion that accommodates the other end of the connecting portion. Extending from both banks of the river, each having an upstream wall facing upstream, a downstream wall facing downstream, and sidewalls extending between said upstream wall and said downstream wall. a pair of non-overflow parts for discharging water, and a permeable part for passing flowing water between the pair of non-overflow parts, wherein the permeable part is provided to catch objects flowing from the upstream to catch the flowing water is a trapping body that flows
A first leg fixed at one end to the permeable part and inclined downstream as it goes upward, and a first leg fixed to the permeable part and the other end fixed to the first leg, upward a plurality of pillars having a second leg that slopes upstream as it goes;
a plurality of beams connecting the pillars;
a connecting portion having one end fixed to the pillar and the other end fixed to the side wall to connect the pair of sleeves and the pillar ;
with
The capturing body , wherein the first leg of the column has a fixing portion to which one end of the connecting portion is detachably attached . Between the first leg portion and an impermeable wall portion detachably provided on the upstream wall portion of the pair of non-overflow portions to cover the opening on the upstream side of the permeable portion and block earth and sand. 7. The support member according to claim 6, which is provided and is detachably fixed to the first leg, the supporting member sloping downward from the impermeable wall side toward the first leg. capture body.

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