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

Exclusion method of sediment of transmission type sabo dam Download PDF

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Publication number
JP4673515B2
JP4673515B2 JP2001248241A JP2001248241A JP4673515B2 JP 4673515 B2 JP4673515 B2 JP 4673515B2 JP 2001248241 A JP2001248241 A JP 2001248241A JP 2001248241 A JP2001248241 A JP 2001248241A JP 4673515 B2 JP4673515 B2 JP 4673515B2
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Japan
Prior art keywords
dam
sediment
transmission type
type sabo
showing
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Expired - Lifetime
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JP2001248241A
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Japanese (ja)
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JP2003055942A (en
Inventor
精次 若松
俊彦 美野輪
広保 白浜
脩 福知
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JFE Metal Products and Engineering Inc
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JFE Metal Products and Engineering Inc
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Priority to JP2001248241A priority Critical patent/JP4673515B2/en
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Description

【0001】
【発明の属する技術分野】
この発明は、ダムの構成部材の一部を撤去して、ダムのスリット純間隔(柱材純間隔)を拡げ、ダムの上流側に堆積した土砂、土石等の堆積物を自然流水により下流側に押し流して排除する、透過型砂防ダムの堆積物の排除方法に関するものである。
【0002】
【従来の技術】
透過型砂防ダムは、土石流を阻止し、平常時および中小洪水時には土砂を下流側に流下させて、計画的にダムの空容量を確保し、且つ、自然の摂理に合致する等、土砂を流下させない不透過型ダムにはない利点を有している。
【0003】
鋼管を主要構成部材とする透過型砂防ダムの一つに、図1に示される鋼管製透過型砂防ダムが知られている。
【0004】
この透過型砂防ダムは、基礎コンクリート1上に渓流方向と直角方向に間隔をあけて固定された上下に2分割された鋼管製柱材2と、柱材2間を連結するつなぎ梁材3と、柱材2と基礎コンクリート1間に配された傾斜梁材(図示せず)とからなっている。
【0005】
この種の透過型砂防ダムによれば、土石流の巨礫の衝突エネルギーは、柱材2およびつなぎ材3の凹み変形や塑性曲げ変形等によって吸収される。
【0006】
【発明が解決しようとする課題】
土石流を捕捉した砂防ダムは、ダム上流側に捕捉された堆積物が堆積した状態となる。こうした堆積物のうち、後続の洪水(流水)によって少量且つ小径のものは下流側に押し流されるが、大半は堆積した状態で残る。従って、ダム本来の機能を回復させるには、堆積物を全て排除する必要があるが、これを全て機械力によって行うとすると、莫大な費用と労力がかかる。
【0007】
そこで、本願発明者等は、ダム上流側の堆積物の排除を費用および労力をかけず容易に行う手段を得べく、鋭意検討を重ねた。その結果、ダムのスリット純間隔を拡げ、自然流水によって堆積物を下流側に押し流せば、堆積物の排除に費用と労力がかからないといった知見を得た。
【0008】
【課題を解決するための手段】
この発明は、上記知見に基きなされたものであって、下記を特徴とする。
【0009】
請求項1記載の発明は、透過型砂防ダムの上流側の堆積物を下流側に排除する方法において、ダムの構成部材の一部を撤去して、ダムのスリット純間隔を拡げる工程と、撤去した構成部材の両側の構成部材間をつなぎ梁材によって連結する工程と、自然流水によって前記堆積物を下流側に押し流して排除する工程と、を有することに特徴を有するものである。
【0013】
【発明の実施の形態】
次に、この発明の透過型砂防ダムの堆積物排除方法の一実施態様を、図面を参照しながら説明する。
【0014】
図2は、柱材の一部を撤去した透過型砂防ダムを示す概略正面図、図3は、堆積物が堆積した状態を示す概略断面図、図4は、捕捉された柱材側上層堆積物を掘削した状態を示す概略断面図、図5は、上部柱材を撤去した状態を示す概略断面図、図6は、上層堆積物が流水により押し流された状態を示す概略断面図、図7は、捕捉された柱材側下層堆積物を掘削した状態を示す概略断面図、図8は、下部柱材を撤去した状態を示す概略断面図、図9は、下層堆積物が流水により押し流された状態を示す概略断面図、図10は、柱材を取り付けた状態を示す概略断面図である。
【0015】
図2に示すように、ダムの構成部材の一部である柱材2を一部、撤去して、ダムの透過部のスリット純間隔(L1)を(L2)に拡げる。透過型砂防ダムの機能を支配するのはスリット純間隔である。洪水時の土石流を完全に捕捉するスリット純間隔は、設計上の礫径の1.0〜1.5倍程度であるが、柱材2を一部、撤去することによってスリット純間隔を、例えば、2.5〜4.0程度に拡げる。これによって、ダム上流側の土砂、土石等の堆積物を自然流水によって下流側に押し流すことが可能となる。柱材2の一部を撤去した後は、柱材2間を新たにつなぎ梁材4によって連結し、ダム全体を補強する。
【0016】
さらに詳しくは、図3に示すように、堆積物が堆積している状態から、図4に示すように、つなぎ梁材3によって連結された柱材側上層堆積物を掘削排除する。次に、図5に示すように、撤去する柱材の上部の締結ボルトを外して上部柱材2Aを撤去し、撤去した柱材の両側の柱材間を他のつなぎ梁材4によって連結する。このようにして、上部スリット純間隔を拡げたら、図6に示すように、自然流水によって上流側の上層堆積物が下流側に押し流されるのを待つ。
【0017】
次に、図7に示すように、柱材側下層堆積物を掘削排除する。次に、図8に示すように、撤去する柱材の下部の締結ボルトを外して下部柱材2Bを撤去し、撤去した柱材の両側の柱材間を他のつなぎ梁材4によって連結する。このようにして、下部スリット純間隔を拡げたら、図9に示すように、自然流水によって下流側の下層堆積物が下流側に押し流されるのを待つ。このようにして、堆積物が下流側に押し流され、排除されたら、図10に示すように、上部柱材2A、下部柱材2Bおよびつなぎ梁材3を元の状態に組み立てる。
【0018】
上述したように、この発明によれば、ダムのスリット純間隔を拡げることによって、自然流水により堆積物を下流側に押し流すことができるので、堆積物の排除に費用と労力がかからない。
【0019】
上述の例は、上部柱材2Aを撤去した後、下部柱材2Bを撤去するものであるが、上部柱材2Aおよび下部柱材2Bを同時に撤去しても良い場合がある。
【0020】
なお、柱材、梁材等のダム構成部材は、撤去可能なようにボルト等により連結することが好ましい。また、上記例は、柱材とつなぎ梁材とからなる透過型砂防ダムの場合であるが、基礎コンクリートと柱材との間に傾斜梁材を設けたダム等、他の構造の透過型砂防ダムにも適用できることは言うまでもない。
【0021】
【発明の効果】
以上説明したように、この発明によれば、ダムの構成部材の一部を撤去して、ダムのスリット間隔を拡げることによって、自然流水により堆積物を下流側に押し流して排除することができるので、堆積物の排除に費用と労力がかからないといった有用な効果がもたらされる。
【図面の簡単な説明】
【図1】鋼管製透過型砂防ダムを示す概略正面図である。
【図2】柱材の一部を撤去した透過型砂防ダムを示す概略正面図である。
【図3】堆積物が堆積した状態を示す概略断面図である。
【図4】捕捉された柱材側上層堆積物を掘削した状態を示す概略断面図である。
【図5】上部柱材を撤去した状態を示す概略断面図である。
【図6】上層堆積物が流水により押し流された状態を示す概略断面図である。
【図7】捕捉された柱材側下層堆積物を掘削した状態を示す概略断面図である。
【図8】下部柱材を撤去した状態を示す概略断面図である。
【図9】下層堆積物が流水により押し流された状態を示す概略断面図である。
【図10】柱材を取り付けた状態を示す概略断面図である。
【符号の説明】
1:基礎コンクリート
2:柱材
2A:上部柱材
2B:下部柱材
3:つなぎ梁材
4:他のつなぎ梁材
[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)

透過型砂防ダムの上流側の堆積物を下流側に排除する方法において、
ダムの構成部材の一部を撤去して、ダムのスリット純間隔を拡げる工程と、撤去した構成部材の両側の構成部材間をつなぎ梁材によって連結する工程と、自然流水によって前記堆積物を下流側に押し流して排除する工程と、を有することを特徴とする、透過型砂防ダムの堆積物の排除方法。
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.
JP2001248241A 2001-08-17 2001-08-17 Exclusion method of sediment of transmission type sabo dam Expired - Lifetime JP4673515B2 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09228348A (en) * 1996-02-23 1997-09-02 Nippon Zenisupaipu Kk Debris barrier and sand control method
JPH1150435A (en) * 1997-08-05 1999-02-23 Kawatetsu Steel Prod Corp Semi-permeation-type erosion control dam
JP2001303538A (en) * 2000-04-20 2001-10-31 Marutoku Tekko:Kk Sedimental control dam of steel
JP2002121728A (en) * 2000-10-17 2002-04-26 Nippon Steel Corp Column line type steel slit dam structure
JP2002121727A (en) * 2000-10-12 2002-04-26 Nippon Steel Corp Steel slit dam structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09228348A (en) * 1996-02-23 1997-09-02 Nippon Zenisupaipu Kk Debris barrier and sand control method
JPH1150435A (en) * 1997-08-05 1999-02-23 Kawatetsu Steel Prod Corp Semi-permeation-type erosion control dam
JP2001303538A (en) * 2000-04-20 2001-10-31 Marutoku Tekko:Kk Sedimental control dam of steel
JP2002121727A (en) * 2000-10-12 2002-04-26 Nippon Steel Corp Steel slit dam structure
JP2002121728A (en) * 2000-10-17 2002-04-26 Nippon Steel Corp Column line type steel slit dam structure

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