JP2003055942A - Eliminating method of sediment for permeable check dam and permeable check dam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the elimination of sediment without requiring much cost and labor. SOLUTION: The component of a dam is partially removed to extend the slit pure space (L2 ) of the dam, whereby the sediment is washed away to the downstream side by natural flowing water and eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing deposits of a transmission type erosion control dam and a transmission type erosion control dam, and in particular, by removing a part of the constituent members of the dam, the pure gap of the dam (column material pure Space) and the sediment deposited on the upstream side of the dam,
The present invention relates to a method for removing sediments of a transmission type sabo dam and a transmission type sabo dam, which removes deposits such as debris by flushing them to the downstream side with natural running water.

[0002]

2. Description of the Related Art Permeable sabo dams prevent debris flow and allow sediment to flow downstream during normal times and during small and medium floods.
It has advantages over the impermeable dam that does not allow sediment to flow down, such as ensuring the empty capacity of the dam systematically and conforming to the natural providence.

As one of the transmission type sand control dams having a steel pipe as a main component, the transmission type sand control dam made of steel pipe shown in FIG. 1 is known.

This transmission type erosion control dam is a steel pipe pillar member 2 which is fixed on a concrete foundation 1 at intervals in a direction perpendicular to the stream direction and is divided into two parts, and a connecting beam connecting the pillar members 2. It is made up of a material 3 and an inclined beam material (not shown) arranged between the pillar material 2 and the foundation concrete 1.

According to this type of transmission type erosion control dam, the collision energy of the boulders of the debris flow is absorbed by the concave deformation and plastic bending deformation of the column member 2 and the connecting member 3.

[0006]

The erosion control dam that has captured the debris flow is in a state in which the captured sediment has accumulated on the upstream side of the dam. Of these deposits, a small amount and small diameter are washed away by the subsequent flood (runoff),
Most remain in the deposited state. Therefore, in order to restore the original function of the dam, it is necessary to remove all the deposits,
If all this is done by mechanical power, it will take enormous cost and labor.

[0007] Therefore, the inventors of the present application have made extensive studies in order to obtain a means for easily removing deposits on the upstream side of the dam without any expense and labor. As a result, we found that it would not cost and labor to remove the sediments by expanding the slit spacing of the dam and pushing the sediments downstream by natural running water.

[0008]

The present invention is based on the above findings and is characterized by the following.

According to the first aspect of the present invention, in the method of removing the deposit on the upstream side of the permeable erosion control dam to the downstream side, some of the dam constituent members are removed to widen the slit slit spacing of the dam. The feature is that the sediment is pushed down to the downstream side by natural flowing water to be removed.

The invention according to claim 2 is characterized in that a part of the constituent members of the dam can be removed.

The invention according to claim 3 is characterized in that the removable component member is a pillar member.

The invention according to claim 4 is characterized in that the removable component members are a column member and a beam member.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the method for removing deposits of a transmission type erosion control dam of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic front view showing a transmission type erosion control dam in which a part of the pillar material is removed, FIG. 3 is a schematic sectional view showing a state in which deposits are accumulated, and FIG. 4 is a captured pillar material. FIG. 5 is a schematic cross-sectional view showing a state in which the upper-side deposit has been excavated, FIG. 5 is a schematic cross-sectional view showing a state in which the upper pillar material has been removed, and FIG. 6 is a schematic cross-sectional view showing a state in which the upper-layer deposit has been washed away by running water. , Fig. 7
Is a schematic cross-sectional view showing a state in which the trapped pillar-side lower layer deposit is excavated, FIG. 8 is a schematic cross-sectional view showing a state in which the lower column member is removed, and FIG. 9 is a schematic diagram showing the lower-layer deposit being washed away by running water. FIG. 10 is a schematic cross-sectional view showing a state in which a column member is attached.

As shown in FIG. 2, a part of the pillar 2 which is a part of the dam constituent member is removed to widen the slit pure interval (L1) of the dam transmission part to (L2). The pure spacing of slits controls the function of the transmission type erosion control dam. The slit pure interval for completely capturing the debris flow at the time of flood is about 1.0 to 1.5 times the designed gravel diameter, but by removing part of the pillar material 2, the slit pure interval can be set to, for example, , 2.5
Expand to about 4.0. As a result, sediment such as earth and sand and debris on the upstream side of the dam can be flushed to the downstream side by natural running water. After removing a part of the pillar material 2, the pillar materials 2 are newly connected by a connecting beam material 4 as needed, and the whole dam is reinforced.

More specifically, as shown in FIG. 3, the column material side upper layer deposits connected by the connecting beam members 3 are excavated from the state where the deposits are accumulated, as shown in FIG. Next, as shown in FIG. 5, the fastening bolts on the upper part of the column member to be removed are removed to remove the upper column member 2A, and the column members on both sides of the removed column member are connected by another connecting beam member 4. . In this way, if you expand the upper slit pure interval,
As shown in FIG. 6, it waits for the upper layer sediment on the upstream side to be swept down to the downstream side by the natural flowing water.

Next, as shown in FIG. 7, the pillar material side lower layer deposit is excavated and removed. Next, as shown in FIG. 8, the fastening bolts at the bottoms of the pillars to be removed are removed, the lower pillars 2B are removed, and the pillars on both sides of the removed pillars are connected by another connecting beam 4. . When the lower slit pure interval is expanded in this way, as shown in FIG. 9, it is waited for the lower layer deposit on the downstream side to be swept down to the downstream side by natural running water. In this way, when the deposit is washed away to the downstream side and is removed, as shown in FIG. 10, the upper pillar material 2A and the lower pillar material 2B.
And the connecting beam member 3 is assembled in the original state.

As described above, according to the present invention, by expanding the slit pure gap of the dam, it is possible to push the deposit to the downstream side by the natural running water, so that the deposit is eliminated with no expense and labor.

In the above example, after removing the upper pillar 2A,
Although the lower pillar member 2B is removed, the upper pillar member 2A and the lower pillar member 2B may be simultaneously removed in some cases.

It is preferable that the dam constituent members such as the pillar members and the beam members are connected by bolts so that they can be removed. Further, the above example is a case of a transmission type erosion control dam consisting of a pillar material and a connecting beam material, but a transmission type erosion control material of another structure such as a dam in which an inclined beam material is provided between the basic concrete and the pillar material. It goes without saying that it can also be applied to dams.

[0021]

As described above, according to the present invention, by removing a part of the constituent members of the dam and widening the slit interval of the dam, the sediment is flushed to the downstream side by natural flowing water and eliminated. Therefore, it has a useful effect that it is inexpensive and labor-free to remove the deposits.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a transmission sabo dam made of steel pipe.

FIG. 2 is a schematic front view showing a transmission type erosion control dam in which a part of a pillar material is removed.

FIG. 3 is a schematic cross-sectional view showing a state in which deposits are deposited.

FIG. 4 is a schematic cross-sectional view showing a state in which the trapped pillar material-side upper layer deposit is excavated.

FIG. 5 is a schematic cross-sectional view showing a state in which an upper column member is removed.

FIG. 6 is a schematic cross-sectional view showing a state in which an upper layer deposit is washed away by running water.

FIG. 7 is a schematic cross-sectional view showing a state where the trapped pillar-side lower layer deposit is excavated.

FIG. 8 is a schematic cross-sectional view showing a state in which a lower column member is removed.

FIG. 9 is a schematic cross-sectional view showing a state in which a lower layer deposit is washed away by running water.

FIG. 10 is a schematic cross-sectional view showing a state in which a pillar member is attached.

[Explanation of symbols]

1: Foundation concrete 2: Pillar material 2A: Upper pillar material 2B: Lower pillar material 3: Connecting beam material 4: Other connecting beam materials

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Fukuchi             5-1-11 Kataseyama, Fujisawa City, Kanagawa Prefecture

Claims (4)

[Claims] 1. A method for removing deposits on the upstream side of a permeable erosion control dam to the downstream side, by removing a part of the constituent members of the dam to widen the slit pure gap of the dam, and allowing the deposit to flow by natural running water. A method of removing sediments from a transmission type sabo dam, which comprises flushing away the wastewater to the downstream side. 2. A transmission type erosion control dam, wherein a part of the constituent members of the dam is removable. 3. The transparent erosion control dam according to claim 2, wherein the removable component member is a column member. 4. The transparent erosion control dam according to claim 2, wherein the removable component members are a pillar member and a beam member.