JP4673515B2 - Exclusion method of sediment of transmission type sabo dam - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention removes a part of the dam components, widens the dam slit pure interval (column pure interval), and deposits such as sediment, debris, etc. deposited on the upstream side of the dam downstream by natural running water The present invention relates to a method for removing deposits from a transmission type sabo dam.
[0002]
[Prior art]
The transmission type sabo dam prevents debris flow, and during normal times and during small and medium floods, the sediment flows down to the downstream side to ensure the planned capacity of the dam and to meet the natural providence. It has advantages not found in impervious dams.
[0003]
As one of transmission-type sabo dams having a steel pipe as a main component, a steel-tube permeable sabo dam shown in FIG. 1 is known.
[0004]
This transmission type sabo dam is composed of a steel pipe column 2 divided into two parts on the foundation concrete 1 and spaced in a direction perpendicular to the mountain stream direction, and a connecting beam 3 connecting the column members 2 to each other. , Composed of an inclined beam material (not shown) disposed between the column material 2 and the foundation concrete 1.
[0005]
According to this type of transmission type sabo dam, collision energy of debris boulders is absorbed by dent deformation, plastic bending deformation, and the like of the column material 2 and the connecting material 3.
[0006]
[Problems to be solved by the invention]
The sabo dam that captures the debris flow is in a state where sediment captured on the upstream side of the dam is deposited. Of these deposits, a small amount and a small diameter are swept downstream by the subsequent flood (running water), but most remain deposited. Therefore, in order to restore the original function of the dam, it is necessary to eliminate all the deposits. However, if this is all done by mechanical force, enormous costs and labor are required.
[0007]
Accordingly, the inventors of the present application have made extensive studies in order to obtain means for easily removing deposits on the upstream side of the dam without cost and labor. As a result, it was found that if the net gap between the dam slits was widened and the sediment was washed away by natural water, it would not cost money and effort to eliminate the sediment.
[0008]
[Means for Solving the Problems]
The present invention has been made on the basis of the above findings and is characterized by the following.
[0009]
A first aspect of the present invention, a a method for eliminating the upstream side of the deposits transmission check dams downstream, to remove a portion of the dam of the components, Ru expand the slit net spacing of dam process, It is characterized in that it includes a step of connecting the constituent members on both sides of the removed constituent member by a connecting beam member, and a step of removing the deposit by pushing it downstream with natural running water.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the transmission type sabo dam sediment removal method of the present invention will be described with reference to the drawings.
[0014]
2 is a schematic front view showing a transmission type sabo dam from which a part of the pillar material has been removed, FIG. 3 is a schematic sectional view showing a state in which deposits are deposited, and FIG. FIG. 5 is a schematic cross-sectional view showing a state in which the upper pillar material has been removed, FIG. 6 is a schematic cross-sectional view showing a state in which the upper layer sediment is swept away by running water, and FIG. Fig. 8 is a schematic cross-sectional view showing a state where the captured pillar material side lower layer sediment is excavated, Fig. 8 is a schematic cross-sectional view showing a state where the lower column material is removed, and Fig. 9 is a diagram where the lower layer sediment is washed away by running water. FIG. 10 is a schematic cross-sectional view showing a state in which a column member is attached.
[0015]
As shown in FIG. 2, a part of the pillar material 2 which is a part of the dam constituent member is removed, and the slit pure interval (L1) of the transmission part of the dam is expanded to (L2). Slit net spacing dominates the function of the transmission type sabo dam. The net slit interval that completely captures the debris flow during flooding is about 1.0 to 1.5 times the gravel diameter of the design, but by removing part of the column material 2, the net slit interval is, for example, , And expand to about 2.5 to 4.0 times . As a result, sediments such as sediment and debris on the upstream side of the dam can be swept downstream by natural running water. After a part of the pillar material 2 is removed, the pillar material 2 is newly connected by the connecting beam material 4 to reinforce the entire dam.
[0016]
More specifically, as shown in FIG. 3, the column material side upper layer deposit connected by the connecting beam member 3 is excavated and removed from the state where the deposit is accumulated, as shown in FIG. Next, as shown in FIG. 5, the upper bolt 2 </ b> A is removed by removing the upper fastening bolts of the pillars to be removed, and the pillars on both sides of the removed pillars are connected by other connecting beam members 4. . In this way, when the upper slit pure interval is widened, as shown in FIG. 6, it waits for the upstream upper layer deposit to be pushed downstream by the natural water flow.
[0017]
Next, as shown in FIG. 7, the column material side lower layer deposit is excavated and removed. Next, as shown in FIG. 8, the lower bolt 2B is removed by removing the fastening bolt at the lower part of the column material to be removed, and the column materials on both sides of the removed column material are connected by another connecting beam material 4. . In this way, when the lower slit pure interval is widened, as shown in FIG. 9, it waits for the downstream lower layer sediment to be washed away by the natural running water. In this way, when the deposits are washed away to the downstream side and removed, the upper column member 2A, the lower column member 2B and the connecting beam member 3 are assembled in the original state as shown in FIG.
[0018]
As described above, according to the present invention, deposits can be swept down downstream by natural running water by widening the slit pure interval of the dam, so that cost and labor are not required to eliminate the deposits.
[0019]
In the example described above, the upper pillar 2A is removed, and then the lower pillar 2B is removed. However, the upper pillar 2A and the lower pillar 2B may be removed at the same time.
[0020]
In addition, it is preferable to connect dam components, such as a pillar material and a beam material, with a volt | bolt etc. so that removal is possible. In addition, the above example is the case of a transmission type sabo dam consisting of a column material and a connecting beam material. However, other types of transmission type sabo dams such as a dam with an inclined beam material provided between the foundation concrete and the column material. It goes without saying that it can also be applied to dams.
[0021]
【The invention's effect】
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 can be pushed away by natural flowing water and eliminated. In addition, there is a useful effect that the removal of deposits does not require cost and labor.
[Brief description of the drawings]
FIG. 1 is a schematic front view showing a steel pipe transmission type sabo dam.
FIG. 2 is a schematic front view showing a transmission type sabo dam from which a part of a pillar material has been 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 captured columnar material upper layer deposit is excavated.
FIG. 5 is a schematic cross-sectional view showing a state in which the upper column member is removed.
FIG. 6 is a schematic cross-sectional view showing a state in which the upper layer deposit is washed away by running water.
FIG. 7 is a schematic cross-sectional view showing a state where the captured pillar material 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.
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 where a column member is attached.
[Explanation of symbols]
1: Foundation concrete 2: Column material 2A: Upper column material 2B: Lower column material 3: Connecting beam material 4: Other connecting beam material

Claims (1)

In the method of removing the deposit on the upstream side of the transmission type sabo dam on the downstream side,
And removing the portion of the dam of the components, a step of Ru expand the slit net spacing of the dam, and a step of connecting the beam members connects between the two sides of the components of the removal the component, the deposit by natural flowing water characterized in that it and a step of eliminating by swept away downstream, the method eliminates the transmission check dams sediment.

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