JPH0786211B2 - Inclined slide type scour prevention device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inclined slide type scour preventive device for preventing scour of a river bed ground downstream of a dam structure or scour of a water bottom ground near a revetment structure.

[0002]

2. Description of the Related Art Conventionally, (1) In order to prevent scouring of the river bed ground on the downstream side of the dam structure or to prevent scouring of the water bottom ground near the revetment structure, the river bed ground at the scouring prevention place is used. Alternatively, a scour prevention means for mounting a scour prevention box configured by filling a water-permeable steel box body with stones on the water bottom ground is adopted.

In the case of the above-mentioned conventional scour prevention means, when the riverbed ground below the scour prevention box or the water bottom ground below the scour prevention box is scourd, the bottom of the scour prevention box is The scouring of the ground spreads. Also, as the scour of the ground below the scour prevention box spreads, the part of the scour prevention box that is not supported by the ground expands, so a large load of a large amount of stones causes bending force on the water-permeable steel box. Acts as. (2) As disclosed in Japanese Patent Laid-Open No. 55-95706, a bolt or a connecting member is attached between connecting brackets arranged inside and outside a steel box body filled with stones, It is also known that steel boxes are connected to each other.

[0004]

In the case of the conventional scour preventive means of the above (1), it is impossible to prevent the scour of the ground from spreading below the scour preventive box, and the scour preventive box. When the scouring of the ground below spreads, a large load due to a large amount of stones acts on the water-permeable steel box body as a bending force, and the water-permeable steel box body may be damaged. Further, in the case of (2), since it is necessary to dispose the connecting bracket inside the steel box body filled with stones, when the adjacent steel box bodies move up and down, the steel box A connecting bracket in the body,
The stones filled in the steel box may interfere with each other, and the steel boxes may not move up and down.

[0005]

In order to advantageously solve the above-mentioned problems, in the inclined slide type scour preventive device of the present invention, the fixed scour preventive box 4 is provided on the downstream side or offshore side from above to below. Is provided with an inclined vertical guide member 2 having a groove 15 inclined so as to be deviated toward the downstream side or the offshore side, and the movable scour prevention box 7 is located close to the downstream side or the offshore side of the fixed scour prevention box 4. The guide member 8 fixed to the upper portion of the movable scour prevention box 7 on the upstream side or the land side is fitted in the groove 15 of the inclined vertical guide member 2 so as to be inclined and descendable.

[0006]

1 to 8 show a first embodiment of the present invention, and FIGS. 1 to 5 show a state before scour,
6 to 8 show the state after scour. The steel main frame member 10 and the steel front main frame member 11 and the steel intermediate frame rod 12 which are inclined so as to be displaced downward from the upper side to the lower side are joined by welding or bolts 13, The water-soluble steel box body 1 is configured, and the web of the inclined member 14 made of cut T-shaped steel is provided at the center of the front surface (downstream surface) of the front main frame member 11 in the water-permeable steel box body 1. The front main frame member 11 and the inclined member 14 are fixed by welding, and an inclined vertical guide member 2 that is inclined so as to be displaced from the upper side to the lower side toward the downstream side is configured. The grooves 15 of the inclined vertical guide member 2 are arranged at intervals in the river width direction (horizontal direction), open in the horizontal direction, and a stopper 16 is fixed to the lower end portion of the inclined vertical guide member 2 by welding. From the expanded metal on the front of the water-permeable steel box 1. That wire mesh 17 is secured by welding, also stones such third stone or concrete mass or the like is filled in the water permeability steel box body 1, fixed scour preventive box 4 is constituted. A steel rear frame member 18, a steel front frame member 19, a steel main frame member 20, a steel intermediate frame rod 21, and a steel side plate 22, which are inclined from the upper side to the lower side so as to be displaced toward the downstream side. Are joined together by welding or bolts 23 to form a water-permeable steel box body 6
And the stones 3 are filled in the water-permeable steel box body 6 to form the movable scour prevention box 7. The base end of a steel bracket 24 protruding toward the upstream side is fixed by welding to the upper portion of the rear frame member 18 in the movable scour prevention box 7, and the inclined vertical guide member 2 is attached to the tip of the bracket 24. Guide member 8 made of a steel plate inclined at an equal angle to
Is fixed by welding, and the guide member 8 is fitted in the side opening groove 15 of the inclined vertical guide member 2 so as to be inclined downward. The fixed scour prevention box 4 is placed close to the downstream side of the dam structure 5 and placed on the riverbed 25, and the large number of movable scour prevention boxes 7 are located downstream of the fixed scour prevention box 4. Are placed side by side in the river width direction and placed on the riverbed ground 25, and stones 26 are filled between the upper end of the fixed scour prevention box 4 and the dam structure 5.

The riverbed ground 25 on the downstream side of the inclined slide type scour prevention device is scour, and the scour is movable.
6 to 8, the downstream movable scour preventive box 7 descends diagonally forward with respect to the upstream movable scour preventive box 7 as shown in FIGS. On the other hand, when the movable scour preventive box 7 is lowered, the movable scour preventive box 7 is bent downward and connected to the downstream side of the fixed scour preventive box 4, so that the movable scour preventive box 7 prevents the fixed scour preventive box 7. The scouring of the riverbed ground 25 below the box 4 is prevented. When the scouring of the riverbed ground 25 proceeds toward the upstream side, the scouring part proceeds with the upstream end of the sloping portion being inclined, but is guided by the inclined vertical guide member 2 and the guide member 8. As the movable scour prevention box 7 descends diagonally toward the downstream side,
The movable scour prevention box 7 can be promptly opposed to the inclined end on the upstream side of the scour part.

In the case of carrying out the present invention, a plurality of movable scour prevention boxes 7 are arranged side by side in the river direction, and at the downstream end of the upstream movable scour prevention box, from the upper side to the lower side, the downstream side. A vertical guide member that is inclined so as to be deviated from the vertical guide member is provided, and a guide member fixed to the upstream upper portion of the downstream movable scour prevention box may be fitted to the vertical guide member so as to be inclined and lowered. Good.

FIG. 9 shows a second embodiment of the present invention, in which the fixed scour prevention box 4 is placed close to the revetment structure 9 and placed on the water bottom 27 to prevent movable scour. The box 7 is placed close to the offshore side of the fixed scour prevention box 4 and placed on the subsoil 27, and is attached to the offshore side end of the fixed scour prevention box 4 from the upper side to the lower side. An inclined vertical guide member 2 that is inclined so as to be deviated to a fixed position is fixed, and a guide member 8 is fixed to an upper part of a land side end of the movable scour prevention box 7.
Although it is fitted in the tilted vertical guide member 2 so as to be tilted downward, the other configurations and operations are the same as in the case of the first embodiment. In the case of the second embodiment, as in the case of the first embodiment, a plurality of movable scour prevention boxes 7 may be arranged side by side toward the offshore side. When this invention is implemented, the inclination angle α of the inclined vertical guide member 2 toward the upstream side or the land side is 10 ° to 3
0 ° is preferably set in the range of 12 ° to 18 °.

[0010]

According to the present invention, the river bed ground 25 or the water bottom ground 27 is scourd, and the scrubbing is performed by the movable scour prevention box 7.
When the movable scour preventive box 7 reaches the lower part of the vertical guide member 2, the movable scour preventive box 7 is reliably guided by the groove 15 of the inclined vertical guide member 2 and the guide member 8 fitted therein, and slanted toward the downstream side or the offshore side. Since it descends downward, the wall surface of the movable scour prevention box 7 on the upstream side or on the land side is automatically and promptly opposed to the upstream inclined end or the land side inclined end of the recess formed by the scour. As a result, since a scour prevention barrier consisting of the movable scour prevention box 7 is automatically and quickly formed at the end of the fixed scour prevention box 4, the riverbed below the fixed scour prevention box 4 is formed. It is possible to prevent the ground 25 or the submerged ground 27 from being scoured. Further, since the movable scour prevention box 7 descends with respect to the fixed scour prevention box 4, the movable scour prevention box 4 is movable. Fixed scouring by increasing the downward protrusion amount of digging prevention box 7 Scouring the bottom of the bed foundation 25 or the sea bed soil 27 of the stop box 4 can be reliably prevented. Further, particularly in the case of the present invention, since the guide member 8 on the movable scour prevention box 7 side is fitted in the groove 15 of the inclined vertical guide member 2 in the fixed scour prevention box 4, the guide member 8 is fixed. Since the movable scour prevention box 7 can be reliably moved with respect to the fixed scour prevention box 4 because the movable scour prevention box 7 can be reliably tilted and lowered along the slanting groove 15 of the slanted vertical guide member 2 without interfering with the stones in the scour prevention box 4. It can be tilted down.

[Brief description of drawings]

FIG. 1 is a side view of an inclined slide type scour prevention device before scour.

FIG. 2 is a plan view of an inclined slide type scour prevention device before scour.

FIG. 3 is an enlarged side view showing an inclined slide portion of FIG.

FIG. 4 is an enlarged plan view of an inclined slide portion.

FIG. 5 is a schematic side view showing an initial state of installation of the inclined slide type scour prevention device.

FIG. 6 is a side view of an inclined slide type scour prevention device after scour.

FIG. 7 is a plan view of an inclined slide type scour prevention device after scour.

FIG. 8 is a front view of an inclined slide type scour prevention device after scour.

FIG. 9 is a schematic side view showing an initial state of installation of the inclined slide type scour prevention device.

[Explanation of symbols]

 1 Water-permeable steel box body 2 Inclined vertical guide member 3 Stones 4 Fixed scour prevention box 5 Dam structure 6 Water-permeable steel box body 7 Movable scour prevention box 8 Guide member 9 Revetment structure 14 Inclination member 15 Groove 16 Stopper 24 Bracket 25 Riverbed 27 Waterbed

Claims (2)

[Claims] 1. A groove 15 inclined toward the downstream side of the water-permeable steel box body 1 so as to be displaced downward from the upper side to the lower side.
An inclined vertical guide member 2 having the above is provided, and a fixed scour prevention box 4 composed of the water-permeable steel box body 1 and stones 3 filled in the water-permeable steel box body 1 is provided near the downstream side of the dam structure 5. The movable scour prevention box 7 placed on the riverbed ground and composed of the water-permeable steel box body 6 and the stones 3 filled therein is located close to the downstream side of the fixed scour prevention box 4. A guide member 8 placed on the bed of the riverbed and provided at an upper portion on the upstream side of the movable scour prevention box 7 is fitted in the groove 15 of the inclined vertical guide member 2 so as to be inclined and descendable. Inclined slide type scour prevention device. 2. An inclined vertical guide member 2 having a groove 15 that is inclined so as to be offset from the upper side toward the lower side is provided on the offshore side of the water-permeable steel box body 1. A fixed scouring preventive box 4 composed of a box body 1 and stones 3 filled therein is placed on the water bottom ground near the offshore side of the revetment structure 9, and a water-permeable steel box body 6 is provided. And stones filled in it 3
The movable scour prevention box 7 consisting of the fixed scour prevention box 4
The guide member 8 placed on the bottom of the water close to the offshore side of the shore and provided on the upper part of the movable scour prevention box 7 on the land side is fitted in the groove 15 of the sloping vertical guide member 2 so as to be tiltable and descendable. Sloping slide type scouring prevention device characterized in that