JPH0455076Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is installed on the riverbed in areas where debris flows are expected to occur, and is used to separate and stop large-sized stones from the debris flows that occur, thereby reducing debris flows. This article relates to a debris flow separator for preventing or stopping debris flows.

[Prior art]

Conventionally, as shown in FIG. 6, a debris flow separator installed on a river bed has a support structure 6 with a large number of support girders 7 extending in a direction perpendicular to the debris flow direction.
A structure is known in which the screen members 8 are constructed and fixed at intervals in the debris flow direction, and a large number of screen members 8 extending in the debris flow direction are constructed and fixed across each support girder 7.

The spacing between the screen materials 8 is determined by the particle size of the stones that are to be captured and deposited among the debris in the debris flow, and water and debris with a smaller particle size are allowed to fall from between the screen materials 8. The water is then allowed to flow downstream along the river bed slope.

[Problem that the invention attempts to solve]

Conventionally, as the screen material 8, old rail 8A shown in FIG. 7, angle iron 8B shown in FIG.
A square steel pipe 8C with a square cross section as shown in the figure is generally used, but when these screen materials are used, the following problems occur.

(1) Stones with a particle size approximately equal to the distance between the screen materials are stuck between the screen materials and cannot be removed, resulting in clogging of the screen and deterioration of its original separation function.

(2) After the debris flow has stopped, it is necessary to remove the debris above and below the screen in order to restore the screen's functionality; It is difficult to remove dirt and stones because it is difficult to remove.

[Purpose of the invention, structure]

The purpose of this invention is to provide a debris flow separator for riverbeds that can advantageously solve the above-mentioned problems. This river bed debris flow separator is characterized in that a girder 2 is constructed and a large number of screen members 3 having an inverted trapezoid cross section are constructed and fixed at intervals in the longitudinal direction of the support girder.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

Figures 1 to 4 show an embodiment of this invention, in which on both sides in the width direction of the inclined groove bottom plate 4 which slopes downward from the upstream side to the downstream side,
A vertical groove side plate 10 and an inclined groove side plate 11 are successively installed in a continuous manner so as to move upwardly and outwardly, and the inclined groove bottom plate 4 is set at a slope such that soil and stones naturally slide; An intermediate support plate 12 perpendicular to the widthwise center of the inclined groove bottom plate 4 is integrally connected to constitute a concrete groove-shaped support structure 1, and furthermore, at the downstream end of the support structure 1, ,
A concrete-built reservoir 5 is provided with a bottom plate 13 located at a lower level than the downstream end of the inclined groove bottom plate 4 and a downstream side plate 14 whose upper part is inclined in a direction in which it falls down downstream. A bottom plate 4 and a vertical groove side plate 1 of the support structure 1 are integrally arranged in series.
0 and the reservoir 5 are buried in the river bed ground 16.

A large number of support girders 2 made of I-beams or H-beams extending in the river width direction are arranged at intervals in the debris flow direction, and are connected to the girder receiving surface at the upper end of the vertical groove side plate 10 and the upper end of the intermediate support plate 12. Each support girder 2 is connected to the vertical groove side plate 10 and the intermediate support plate 12 by anchor bolts (not shown).
A plurality of connecting girders 17 are arranged which are fixed by and extend in the debris flow direction across the webs of the support girders 2 adjacent in the debris flow direction, and the connecting girders 17 and the support girders 2 are connected by welding, or Or they are connected by connecting fittings and bolts (not shown).

A large number of screen members 3 made of square steel pipes with an inverted trapezoid cross section whose width gradually decreases from the upper end to the lower end are arranged so as to extend in the debris flow direction and are arranged at regular intervals in the river width direction, Support girder 2
The screen material 3 is constructed over the top surface of the
are fixed to the support girder 2 by welding or the like, and each of the screen materials 3 constitutes a river bed screen.

When a debris flow occurs, stones with a particle size larger than the distance between the tops of adjacent screen materials 3 are deposited on the screen, and stones with a particle size smaller than the distance between the tops of adjacent screen materials 3, earth and sand, and water are deposited on the screen. , after passing through the screen and falling into the support structure 1,
The water flows down on the inclined groove bottom plate 4 and flows into the reservoir 5, and the water overflows from the reservoir 5 and flows downstream,
The soil and stones that have passed through the screen are stored in a reservoir 5.

After the debris flow has stopped, the stones on the screen are removed by mechanical force and the debris 19 in the reservoir 5 is removed.
is also discharged by mechanical force.

The bottom plate 18 at the bottom of the screen in the conventional river bed debris flow separator has a gentle slope that prevents debris from sliding naturally.
Even if the debris on the downstream side of the screen is discharged, the debris accumulated on the bottom slab 18 remains, and when the debris accumulated on the bottom slab 18 is discharged, the space between the screen and the screen material 8 However, in the case of the above-mentioned embodiment of this invention, the debris deposited in the inclined groove bottom plate 4 is removed after the debris flow has stopped. When discharging the soil and stones in the reservoir 5, the soil and stones on the inclined groove bottom plate 4 slide into the reservoir 5, so the inclined groove bottom plate 4
The soil and stones accumulated thereon can be automatically guided into the reservoir 5 whose upper part is open, and can be easily and efficiently discharged by mechanical force.

FIG. 5 shows another example of a screen material that can be used in this invention, in which a strip steel plate is bent to form a screen material 3 having an inverted trapezoidal downward opening groove-shaped cross section.

When implementing this idea, the entire cross section of the screen material 3 is not made into an inverted trapezoid, but the upper part of the screen material is made into an inverted trapezoidal cross section, and a constant width part having parallel vertical sides is connected to the lower part of the inverted trapezoidal cross section. A cross-sectional screen material may also be used.

[Effect of idea]

According to this invention, a large number of support girders 2 are constructed on a support structure 1 installed on a river bed, and a large number of screen materials 3 having an inverted trapezoidal cross section are constructed and fixed at intervals in the longitudinal direction of the support girders. The distance between the side surfaces of adjacent screen materials 3 gradually increases from the upper end to the lower end of the screen materials 3, so that stones do not get caught between the screen materials 3 and cannot be removed, so that the screens do not become clogged. The original separating function of the screen can be maintained, and when stones need to be removed from the screen after the debris flow has stopped, the stones can be easily removed from the screen by simply removing the stones on the screen. , the function of the screen can be restored, and other effects can be obtained.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of this invention, in which Figure 1 is a longitudinal sectional front view of a debris flow separator for riverbeds, Figure 2 is a longitudinal sectional front view showing a part of it, and Figure 3 is a vertical sectional front view showing a part of it. The figure is a plan view of the river bed debris flow separator, and Figure 4 is a vertical side view thereof. FIG. 5 is a longitudinal sectional front view showing another example of the screen material that can be used in this invention. FIG. 6 is a longitudinal sectional front view showing a conventional river bed debris flow separator, and FIGS. 7 to 9 are longitudinal sectional front views showing examples of screen materials in the conventional river bed debris flow separator. In the figure, 1 is a support structure, 2 is a support girder, and 3 is a support structure.
is a screen material, 4 is a sloped groove bottom plate, 5 is a storage pond,
10 is a vertical groove side plate, 11 is an inclined groove side plate, and 12 is an intermediate support plate.

Claims (1)

[Claims for Utility Model Registration] (1) A large number of support girders 2 are erected on a support structure 1 installed on a river bed, and a large number of screen materials 3 having an inverted trapezoidal cross section are erected at intervals in the longitudinal direction of the support girders. A river bed debris flow separator characterized by being fixed. (2) The support structure 1 has a groove-shaped cross section with an inclined groove bottom plate 4 that becomes lower toward the downstream side, and a reservoir 5 is connected to the downstream end of the support structure 1. A river bed debris flow separator according to claim 1 of the utility model registration claim, characterized in that: