JP2000120050A - Method for scouring sedimentary sand on bottom and device therefor - Google Patents
Method for scouring sedimentary sand on bottom and device thereforInfo
- Publication number
- JP2000120050A JP2000120050A JP10297759A JP29775998A JP2000120050A JP 2000120050 A JP2000120050 A JP 2000120050A JP 10297759 A JP10297759 A JP 10297759A JP 29775998 A JP29775998 A JP 29775998A JP 2000120050 A JP2000120050 A JP 2000120050A
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- JP
- Japan
- Prior art keywords
- pipe
- water
- sand
- sediment
- scour
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えばダム貯水池
などの水底の堆砂の排出方法およびその装置に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for discharging sediment from a water bottom such as a dam reservoir.
【０００２】[0002]
【従来の技術】ダムには、発電用、灌漑用、洪水調節用
など種々のものがあるが、いずれのダムでも堆砂が発生
している。この堆砂は、ダム上流域の土砂が河川によっ
て下流域に流され、河川の勾配の減少、流速の減少に応
じて粒径の大きなものから順に堆積したものが、洪水時
に河川流速が増すと、大粒径の土粒子も河床から離れて
移動し（浮遊）、掃流（河床を転がりながら移動）状態
でダム貯水池付近まで運搬されることで発生する。2. Description of the Related Art There are various types of dams, such as those for power generation, irrigation, flood control, etc., but all of them generate sediment. The sediment in the upstream area of the dam is washed down by the river into the downstream area, and the sediment is deposited in descending order of the particle size according to the decrease in the gradient of the river and the flow velocity. Large-sized soil particles also move away from the riverbed (float) and are transported in the form of updrafts (moving while rolling on the riverbed) to the vicinity of the dam reservoir.
【０００３】すなわち、土砂を伴った洪水流がダム貯水
池に近づくと、河川横断面が急激に増すため流速が落
ち、粒径の大きい砂礫分が貯水池の入口付近に堆積す
る。かかる堆砂は貯水量の低下を招くだけでなく、これ
を放置しておくと、堆砂は次第に上流に向かって発達
し、洪水時には上流域において水位上昇を来たし、冠水
被害を発生させることもある。[0003] That is, when a flood flow accompanied by sediment approaches the dam reservoir, the river cross section sharply increases, so that the flow velocity decreases, and large-grained gravel is deposited near the entrance of the reservoir. Not only does such sedimentation cause a decrease in the amount of stored water, but if left unchecked, sedimentation will gradually develop upstream, and during floods, the water level will rise in the upstream basin, causing flood damage. is there.
【０００４】また、ダム下流域では河川の河床が洗掘さ
れ、橋梁基礎や堤防護岸に悪影響が生じたり、細粒分の
流出による動植物への悪影響も発生し、さらに、海岸に
おいても砂の供給量が減少することで海岸線の後退によ
る砂浜の消失や護岸の破壊などが発生する。In the downstream area of the dam, the riverbed of the river is scoured, adversely affecting the foundation of the bridge and the embankment, adversely affecting flora and fauna due to the outflow of fine particles, and furthermore, the supply of sand to the coast. Decrease in the amount will cause loss of sandy beach and destruction of revetment due to retreat of coastline.
【０００５】そこで、ダム湖内の堆砂を排出する必要が
あり、その方法としては従来、種々のものがある。その
一つは、グラブ式浚渫船、バックホー式浚渫船、ポンプ
式浚渫船などの浚渫機械を使用するもので、グラブ式浚
渫船はグラブバケットで水底の土砂を掴み上げる非航式
のものであって一次輸送には土運船を使用する。[0005] Therefore, it is necessary to discharge the sediment in the dam lake, and various methods have hitherto been used. One of them uses a dredging machine such as a grab-type dredge, a backhoe-type dredge, or a pump-type dredge.The grab-type dredge is a non-navigation type that grabs the sediment at the bottom of the water with a grab bucket and is used for primary transportation. Uses an earth transport ship.
【０００６】また、バックホー式浚渫船は台船上にバッ
クホーを搭載したもので、船体をスパッドで固定して浚
渫を行い、浚渫土砂の一次輸送には土運船やパイプライ
ンによる空気圧送を用いる。ポンプ式浚渫船は、船内の
ポンプで汲み口から水とともに土砂を吸い上げ、パイプ
ラインにより一次輸送したり、水中サンドポンプを組立
台船から懸垂して浚渫するものである。A backhoe-type dredger has a backhoe mounted on a barge. The hull is fixed with spuds to perform dredging, and the primary transport of dredged soil is carried out by pneumatic pumping using a soil carrier or pipeline. A pump-type dredger uses a pump onboard to suck up water and sediment with water from a pumping port, and transports it by a pipeline, or dredges a submersible sand pump from an assembling barge.
【０００７】他の方法としては、ダムに排砂用ゲートを
設置して、堆砂の放流、放出を行うものもあり、さらに
他の方法としては出願人が先に提案した特開平9-21127
号公報に記載のようなサイホン式の排砂方法がある。こ
のサイホン方式のものは、堆積土排出管の一端の吸い込
み部をダム貯水池の湖底に開口し、他端の放水部をダム
下流の河川に開口し、サイホン作用によりダム貯水池内
の水と土砂を汲み上げ、ダム下流に流下させるものであ
り、吸い込み部はフロートで構成する作業基地に設置
し、作業基地は陸上に設置したアンカーを利用してウイ
ンチ操作によって設置位置を決定している。As another method, there is a method in which a sand discharge gate is installed in a dam to discharge and discharge sediment. Another method is disclosed in Japanese Patent Application Laid-Open No. 9-21127 which was previously proposed by the applicant.
There is a siphon-type sand discharging method as described in Japanese Patent Application Laid-Open No. H10-260, 1988. In this siphon type, the suction part at one end of the sediment discharge pipe is opened at the bottom of the lake of the dam reservoir, the water discharge part at the other end is opened at the river downstream of the dam, and the water and sediment in the dam reservoir are siphoned. Pumping and flowing down the downstream of the dam, the suction part is installed at a work base composed of a float, and the work base determines the installation position by winch operation using an anchor installed on land.
【０００８】[0008]
【発明が解決しようとする課題】浚渫機械による方法
は、機械を駆動するために多量のエネルギーを要するだ
けでなく、運搬費も嵩む。また、排砂用ゲートを設置す
る方法は、既設のダムに設置する場合には多大の費用を
要する。この点、サイホン式のものはエネルギーを節減
でき、低コスト化を図ることが可能ではあるが、堆砂に
礫が混入している場合に、礫は粒径が大きいためにこれ
をうまく吸い込むことができない。また、堆砂は湖底の
広範囲にわたっていることが多いが、吸い込み部の位置
を効率よく移動することが困難である。The method using a dredging machine not only requires a large amount of energy to drive the machine, but also increases transportation costs. In addition, the method of installing a gate for sand discharge requires a great deal of cost when it is installed on an existing dam. In this regard, the siphon type can save energy and reduce cost, but if gravel is mixed in sediment, the gravel has a large particle size, so it should be sucked well. Can not. In addition, the sediment is often spread over a wide area of the lake bottom, but it is difficult to move the position of the suction part efficiently.
【０００９】本発明の目的は前記従来例の不都合を解消
し、排砂作業に要するエネルギーとコストとの低減を図
るべく、サイホン式の排砂方法を採用する場合に、簡単
な構造で堆砂に混入している礫も排砂管内をスムーズに
輸送することができて、礫混じりの堆砂にも対応でき排
砂を確実に行うことができ、また、湖底の広範囲にわた
っている堆砂に対して吸い込み部の移動も容易に行えて
効率よく排砂できる水底の堆砂排出方法およびその装置
を提供することにある。An object of the present invention is to eliminate the disadvantages of the prior art and reduce the energy and cost required for sand removal work by using a simple structure for sand deposition using a siphon-type sand removal method. The gravel mixed in the sand can be transported smoothly through the sand drainage pipe, it can cope with the sediment mixed with gravel, and the sand can be reliably drained. It is an object of the present invention to provide a method and an apparatus for discharging sediment at the bottom of a water bottom, which can easily move the suction portion and efficiently discharge sand.
【００１０】[0010]
【課題を解決するための手段】本発明は前記目的を達成
するため、第１に、方法としては、排砂管の一端の吸引
管を水底に開口し、他端の放水管を下流の放水路に開口
し、排砂管のサイホン作用により水底の水と堆砂を汲み
上げ、放水路に放流する水底の堆砂排出方法において、
前記排砂管内に渦流を発生させ、この渦流による遠心分
離作用で空気を管内の中心部に、堆砂中の礫を管内円周
部へ分布させることを要旨とするものである。In order to achieve the above object, the present invention firstly opens a suction pipe at one end of a sand discharge pipe to the bottom of the water and connects a water discharge pipe at the other end to a downstream discharge pipe. In the method of discharging sediment at the water bottom that opens into the water channel and pumps up water and sediment at the bottom by the siphon action of the sand discharge pipe and discharges it to the water discharge channel,
The gist of the invention is to generate a vortex in the sand discharge pipe, and to distribute air to the center of the pipe and gravel in the sediment to the inner circumference of the pipe by centrifugal action of the vortex.
【００１１】第２に、水底は、ダム貯水池の湖底である
こと、第３に、吸引管は位置調整手段により水底に対し
て最適勾配に保持すること、第４に、吸引管は移動自在
な作業台船に設置すること、第５に、排砂管はフレキシ
ブルスパイラルパイプで形成することを要旨とするもの
である。Secondly, the bottom of the water is the lake bottom of the dam reservoir. Thirdly, the suction pipe is held at an optimum gradient with respect to the bottom of the water by position adjusting means. Fourth, the suction pipe is movable. Fifth, it is intended to be installed on a workboat, and that the sand drainage pipe is formed by a flexible spiral pipe.
【００１２】第６に装置としては、排砂管の一端の吸引
管を水底に開口し、他端の放水管を下流の放水路に開口
し、排砂管のサイホン作用により水底の水と堆砂を汲み
上げ、放水路に放流する水底の堆砂排出装置において、
前記排砂管内に渦流を発生させる突条を内壁にスパイラ
ル状に設けたことを要旨とするものである。Sixth, as a device, a suction pipe at one end of a sand discharge pipe is opened to the water bottom, and a water discharge pipe at the other end is opened to a downstream water discharge passage, and the water at the water bottom is collected by the siphon action of the sand discharge pipe. In the bottom sediment discharge device that pumps up sand and discharges it to the discharge channel,
The gist of the invention is that a ridge for generating a vortex in the sand discharge pipe is provided in a spiral shape on the inner wall.
【００１３】請求項１記載の本発明によれば、排砂管の
サイホン作用によって水底の水と堆砂を汲み上げる場合
に、排砂管の内部に発生した渦流による遠心分離作用で
空気は管内の中心部に集まり、礫は管内の周面部に移動
するから、礫まじりの堆砂の管内輸送がスムーズに行え
て効率よく容易に排砂できる。According to the first aspect of the present invention, when water and sediment on the bottom of the water are pumped up by the siphon action of the sand discharge pipe, air is centrifugally separated by the vortex generated inside the sand discharge pipe, and the air in the pipe is removed. Since the gravel gathers at the center and the gravel moves to the peripheral surface inside the pipe, the sediment mixed with gravel can be smoothly transported in the pipe, and the sand can be efficiently and easily discharged.
【００１４】請求項２記載の本発明によれば、前記作用
に加えて、ダム貯水池の湖底に堆積している礫まじりの
土砂を効率よく下流に排出でき、貯水量の低下を防止で
きるだけでなく、ダム下流域での河川の河床の洗掘を防
止して、橋梁基礎や堤防護岸へのに悪影響を防ぎ、細粒
分の流出による動植物への悪影響も防止し、さらに、海
岸においても砂の供給量の減少が原因での海岸線の後退
による砂浜の消失や護岸の破壊なども防止できる。According to the second aspect of the present invention, in addition to the above-mentioned effects, it is possible to efficiently discharge the gravel-bearing sediment deposited on the lake bottom of the dam reservoir downstream, thereby preventing a decrease in the amount of stored water. In addition, it prevents the scouring of riverbeds downstream of the dam, prevents adverse effects on bridge foundations and embankments, and also prevents adverse effects on flora and fauna due to the release of fine particles. Loss of the sandy beach and destruction of seawalls due to the retreat of the shoreline due to the decrease in supply can be prevented.
【００１５】請求項３記載の本発明によれば、前記作用
に加えて、排砂管の先端の吸引管を位置調整手段により
湖底に対して最適勾配に保持することで、水底の傾斜面
などにそって傾斜して堆積している土砂に対して最適な
一定勾配に吸引管の先端を開口でき、効率よく吸引でき
る。According to the third aspect of the present invention, in addition to the above-described operation, the suction pipe at the tip of the sand discharge pipe is held at an optimum gradient with respect to the lake bottom by the position adjusting means, so that the inclined surface of the water bottom is used. The tip of the suction pipe can be opened at an optimum constant gradient with respect to the sediment deposited obliquely along the slope, and efficient suction can be performed.
【００１６】請求項４記載の本発明によれば、前記作用
に加えて、作業台船を移動することにより吸引管を所望
位置に自由に移動でき、水底の広範囲にわたっている堆
砂に容易に対処できる。According to the fourth aspect of the present invention, in addition to the above-mentioned operation, the suction pipe can be freely moved to a desired position by moving the workboat, and it is possible to easily cope with sediment over a wide range of the water bottom. it can.
【００１７】請求項５記載の本発明によれば、前記作用
に加えて、排砂管はフレキシブルスパイラルパイプで形
成することにより、作業台船によって吸引管を移動する
際に、作業台船の移動に対して排砂管も容易に追随し、
吸引管の移動がスムーズに行える。According to the fifth aspect of the present invention, in addition to the above operation, the sand discharging pipe is formed by a flexible spiral pipe, so that when the suction pipe is moved by the work boat, the movement of the work boat is required. Sand pipes easily follow
The suction tube can be moved smoothly.
【００１８】請求項６記載の本発明によれば、排砂管の
内壁にスパイラル状に突条を設けるだけの簡単な加工を
加えるだけの構造で管内に渦流を容易に発生させること
ができる。According to the sixth aspect of the present invention, a vortex can be easily generated in the pipe by a simple structure in which only a spiral ridge is provided on the inner wall of the sand discharge pipe.
【００１９】[0019]
【発明の実施の形態】以下、図面について本発明の実施
の形態を詳細に説明する。図１は本発明の水底の堆砂排
出方法およびその装置の実施形態を示す正面図、図２は
同上平面図で、図中１は排砂管を示し、一端を吸引管３
に形成し、他端を放水管４に形成したもので、吸引管３
を水底としてダム貯水池５の湖底に開口し、放水管４を
ダム下流の放水路６に開口し、途中を堤体であるダム本
体２の上面に添わせ、このダム本体２の頂部位置で排砂
管１に管内のエア抜き用のポンプ７を配設した。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view showing an embodiment of a method and an apparatus for discharging sediment on a water bottom according to the present invention, and FIG. 2 is a plan view of the same, wherein 1 shows a sand discharging pipe and one end thereof is a suction pipe 3.
And the other end is formed in the water discharge pipe 4.
Is opened at the lake bottom of the dam reservoir 5, and the water discharge pipe 4 is opened at the water discharge channel 6 downstream of the dam. The sand pipe 1 was provided with a pump 7 for bleeding air from the pipe.
【００２０】排砂管１はフレキシブルスパイラルパイプ
で構成し、途中の適宜箇所にフロート８を取り付けて、
ダム貯水池５の水上に浮設し、管径はダム貯水池５に布
設するものを細く、放水路６側に布設するものを太く形
成する。また、排砂管１の内壁には図４に示すように、
管内に渦流を発生させる例えば断面三角形状の突条９を
スパイラル状に設けた。The sand discharging pipe 1 is composed of a flexible spiral pipe, and a float 8 is attached at an appropriate position in the middle thereof.
Floating above the water in the dam reservoir 5, the pipe diameter is formed thinner in the dam reservoir 5 and thicker in the outlet channel 6. In addition, as shown in FIG.
For example, a ridge 9 having a triangular cross section for generating a vortex in the pipe is provided in a spiral shape.
【００２１】そして、排砂管１の一端の吸引管３をダム
貯水池５を移動自在な作業台船10に位置調整手段11を介
して固定する。この位置調整手段11は、図３に示すよう
に、２本のガイド管12ａ，12ｂをそれぞれ作業台船10に
装着し、このうちの一方のガイド管12ｂを他方のガイド
管12ａよりも長尺に形成し、少なくともこの一方のガイ
ド管12ｂを例えばガイドレール、ローラあるいはボルト
などの組み合わせによるスライド機構14により垂直、水
平方向に移動自在に作業台船10に装着したものである。Then, the suction pipe 3 at one end of the sand discharging pipe 1 is fixed to the work tank 10 which can move the dam reservoir 5 via the position adjusting means 11. As shown in FIG. 3, the position adjusting means 11 mounts two guide tubes 12a and 12b on the workbench 10, respectively, and makes one of the guide tubes 12b longer than the other guide tube 12a. At least one of the guide tubes 12b is attached to the workbench 10 movably in the vertical and horizontal directions by a slide mechanism 14 using a combination of, for example, guide rails, rollers or bolts.
【００２２】そして、この２本のガイド管12ａ，12ｂの
間に掛け渡すようにしてサヤ管13を例えばガイドレー
ル、ローラあるいはボルトなどの組み合わせによるスラ
イド機構14により取付角度調節自在かつ上下動自在に軸
着したもので、このサヤ管13内に吸引管３を挿入し、サ
ヤ管13の両端部位置で直管15を介して吸引管３をサヤ管
13に固定する。The sheath tube 13 is extended between the two guide tubes 12a and 12b by a slide mechanism 14 using a combination of guide rails, rollers or bolts so that the mounting angle can be adjusted and the vertical movement is possible. The suction tube 3 is inserted into the sheath tube 13, and the suction tube 3 is connected to the sheath tube 13 via straight pipes 15 at both end positions of the sheath tube 13.
Fix to 13.
【００２３】また、吸引管３の飲み口部付近に、図示は
省略するが高圧のタービンポンプなどによる水中ポンプ
を設置するとともに、流木やその他の障害物の吸い込み
を防ぐためのスクリーンを設置する。A submersible pump such as a high-pressure turbine pump (not shown) is installed near the mouth of the suction pipe 3, and a screen for preventing suction of driftwood and other obstacles is installed.
【００２４】さらに必要に応じて、堆砂を攪拌するため
のエアコンプレッサを作業台船10に設置するとともに、
堆砂を切り崩すためのカッターを排砂管１の先端に取り
付ける。図中16は、放水路６の発電用放流地点に近い位
置に設置した水門または副ダムを示す。Further, if necessary, an air compressor for agitating the sediment is installed on the workboat 10, and
A cutter for breaking down the sediment is attached to the tip of the sand discharge pipe 1. In the figure, reference numeral 16 denotes a sluice or a secondary dam installed at a position close to the power generation discharge point of the water discharge channel 6.
【００２５】次にかかる装置を使用してダム貯水池５の
堆砂17を排出する方法を説明する。作業台船10を作業位
置に移動し、スライド機構14を動作してガイド管12ａ，
12ｂの水平および垂直位置を調整するとともに、ガイド
管12ａ，12ｂに対するサヤ管13の取付角度を調整して、
サヤ管13の先端に装着されている吸引管３の飲み口部を
堆砂17に対して最適角度に位置させる。Next, a method of discharging the sediment 17 of the dam reservoir 5 using such an apparatus will be described. The work boat 10 is moved to the working position, and the slide mechanism 14 is operated to operate the guide tubes 12a
While adjusting the horizontal and vertical positions of 12b, the mounting angle of the sheath tube 13 with respect to the guide tubes 12a and 12b is adjusted,
The mouth of the suction tube 3 attached to the tip of the sheath tube 13 is positioned at an optimum angle with respect to the sediment 17.
【００２６】放水管４の側を閉じて、吸引管３の飲み口
部付近に設けた水中ポンプを作動して排砂管１内に水を
供給して管内を水で充満させる。または、ポンプ７を作
動して排砂管１内のエア抜きを行う。こうして管内のエ
アを除去した後、放水管４の側を開放すれば、サイホン
作用によってダム貯水池５の水と堆砂17が吸引管３から
吸い上げられて排砂管１を通って放水管４から放水路６
に放流される。このとき、放水管４は管径を大きくして
あるから、大きな排水能力が得られる。The water discharge pipe 4 is closed, and a submersible pump provided near the mouth of the suction pipe 3 is operated to supply water into the sand discharge pipe 1 to fill the inside of the pipe with water. Alternatively, the pump 7 is operated to bleed air from the sand discharge pipe 1. After the air in the pipe is removed in this way, if the side of the water discharge pipe 4 is opened, the water and the sediment 17 of the dam reservoir 5 are sucked up from the suction pipe 3 by the siphon action, and pass through the sand discharge pipe 1 and from the water discharge pipe 4. Spillway 6
To be released. At this time, since the water discharge pipe 4 has a large diameter, a large drainage capacity can be obtained.
【００２７】細粒分の多い堆砂17の場合は、過去の渇水
などが原因でこれが固化していることが多く、礫などの
粒径の大きい土砂が混入することが多く、かかる場合は
排砂効率が極端に低下するおそれがある。これに対して
は、吸引管３の先端に取り付けたカッターで固定の土砂
を切り崩したり、エアコンプレッサを作動して水中に圧
縮空気を噴出させ攪拌させてエアーリフト効果を発揮さ
せて土砂の排出効果を高め、管内の摩擦抵抗を低減させ
る。In the case of sediment 17 having a large amount of fine particles, the sediment is often solidified due to a drought in the past, and sediment having a large particle size such as gravel is often mixed. Sand efficiency may be extremely reduced. In response to this, the fixed earth and sand is broken down with a cutter attached to the tip of the suction pipe 3, or the air compressor is operated to blow out compressed air into the water and agitate it to exert an air lift effect, thereby discharging the earth and sand. And reduce the frictional resistance in the pipe.
【００２８】また、排砂管１の内壁には突条９がスパイ
ラル状に設けてあるから、管内の水や土砂に回転流が発
生し、管内遠心分離作用によって空気は排砂管１の中心
部に、粒径の大きい礫は管内周囲部に分布し、礫まじり
の土砂でもスムーズに管内輸送できる。Since the ridges 9 are provided spirally on the inner wall of the sand discharging pipe 1, a rotating flow is generated in the water and the earth and sand in the pipe, and the air is centrifuged in the pipe so that air flows into the center of the sand discharging pipe 1. Gravel with a large particle size is distributed around the inside of the pipe, so that even soil with gravel can be smoothly transported in the pipe.
【００２９】作業の進行にともない、吸引管３の先端の
飲み口部をスライド機構14によって垂直、水平方向に移
動し、また、作業台船10を自由に移動して湖底の堆砂17
を順次排出する。作業台船10の移動に伴い、排砂管１も
移動するが排砂管１はフレキシブルスパイラルパイプで
形成してあるから、作業台船10の移動にスムーズに追随
する。As the work progresses, the drinking mouth at the tip of the suction pipe 3 is moved vertically and horizontally by the slide mechanism 14, and the work boat 10 is freely moved to deposit the sand 17 on the lake bottom.
Are sequentially discharged. The sand discharge pipe 1 also moves with the movement of the work boat 10, but since the sand discharge pipe 1 is formed of a flexible spiral pipe, it smoothly follows the movement of the work boat 10.
【００３０】また、湖底に沈殿している流木その他の障
害物は吸引管３に設けたスクリーンで除去され排砂管１
内に吸い込まれることはない。Driftwood and other obstacles settled on the bottom of the lake are removed by a screen provided on the suction pipe 3 and the sand discharge pipe 1
It will not be sucked inside.
【００３１】[0031]
【発明の効果】以上述べたように本発明のダム貯水池の
堆砂排出方法およびその装置は、排砂作業に要するエネ
ルギーとコストとの低減を図るべく、サイホン式の排砂
方法を採用する場合に、排砂管の内壁に突状をスパイラ
ル状に設けたから、管内の遠心分離作用によって堆砂に
混入している礫を管内周囲部に移動でき、排砂管内をス
ムーズに輸送することが可能となり、礫混じりの堆砂に
も対応でき排砂を確実に行うことができる。また、排砂
管を作業台船で移動するようにしたから、水底の広範囲
にわたっている堆砂に対して吸い込み部の移動も容易に
行えて効率よく排砂できるものである。As described above, the method and apparatus for discharging sediment from a dam reservoir according to the present invention employ a siphon-type sand discharging method in order to reduce the energy and cost required for sand discharging work. In addition, since the protruding shape is spirally formed on the inner wall of the sand discharge pipe, the gravel mixed in the sediment can be moved to the periphery of the pipe by the centrifugal separation action inside the pipe, and the inside of the sand discharge pipe can be transported smoothly It is possible to cope with sediment mixed with gravel, and it is possible to reliably discharge sand. Further, since the sand discharging pipe is moved by the workboat, the suction part can be easily moved for the sediment spread over a wide area of the water bottom, and the sand can be efficiently discharged.
【図１】本発明のダム貯水池の堆砂排出方法およびその
装置の実施形態を示す正面図である。FIG. 1 is a front view showing an embodiment of a method and an apparatus for discharging sediment from a dam reservoir according to the present invention.
【図２】本発明のダム貯水池の堆砂排出方法およびその
装置の実施形態を示す平面図である。FIG. 2 is a plan view showing an embodiment of a method and apparatus for discharging sediment from a dam reservoir according to the present invention.
【図３】本発明のダム貯水池の堆砂排出方法およびその
装置の実施形態を示す要部の正面図である。FIG. 3 is a front view of a main part showing an embodiment of a method and an apparatus for discharging sediment from a dam reservoir according to the present invention.
【図４】本発明のダム貯水池の堆砂排出装置の実施形態
を示す要部の排砂管の縦断正面図である。FIG. 4 is a longitudinal sectional front view of a main part of a sand drainage pipe showing an embodiment of a sand reservoir discharge device for a dam reservoir according to the present invention.
１…排砂管 ２…ダム本体 ３…吸引管 ４…放水管 ５…ダム貯水池 ６…放水路 ７…ポンプ ８…フロート ９…突条 10…作業台船 11…位置調整手段 12ａ，12ｂ…ガイド
管 13…サヤ管 14…スライド機構 15…直管 16…水門または副ダ
ム 17…堆砂DESCRIPTION OF SYMBOLS 1 ... Sand discharge pipe 2 ... Dam main body 3 ... Suction pipe 4 ... Water discharge pipe 5 ... Dam reservoir 6 ... Water discharge passage 7 ... Pump 8 ... Float 9 ... Projection 10 ... Workboat 11 ... Position adjusting means 12a, 12b ... Guide Pipe 13 ... Saya pipe 14 ... Slide mechanism 15 ... Straight pipe 16 ... Sluice or secondary dam 17 ... Sedimentation
───────────────────────────────────────────────────── フロントページの続き (72)発明者 池谷 毅 東京都調布市飛田給二丁目19番１号 鹿島 建設株式会社技術研究所内 Ｆターム(参考） 2D019 AA48 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeshi Ikeya 2-9-1-1, Tobita-Sen, Chofu-shi, Tokyo
Claims (6)
他端の放水管を下流の放水路に開口し、排砂管のサイホ
ン作用により水底の水と堆砂を汲み上げ、放水路に放流
する水底の堆砂排出方法において、前記排砂管内に渦流
を発生させ、この渦流による遠心分離作用で空気を管内
の中心部に、堆砂中の礫を管内円周部へ分布させること
を特徴とする水底の堆砂排出方法。1. A suction pipe at one end of a sand discharging pipe is opened at the bottom of the water,
In the method of discharging the bottom water and sediment by the siphon action of the sand discharge pipe and opening the water discharge pipe at the other end to the downstream water discharge channel, and discharging the sediment to the water bottom discharged to the water discharge channel, the eddy current is formed in the sand discharge pipe. A method of discharging sediment at the bottom of the water, wherein air is generated at the center of the pipe by the centrifugal action of the vortex and the gravel in the sediment is distributed around the circumference of the pipe.
１記載の水底の堆砂排出方法。2. The method according to claim 1, wherein the bottom is a lake bottom of a dam reservoir.
て最適勾配に保持する請求項１または請求項２記載の水
底の堆砂排出方法。3. The method according to claim 1, wherein the suction pipe is held at an optimum gradient with respect to the water bottom by the position adjusting means.
請求項１から請求項３のいずれかに記載の水底の堆砂排
出方法。4. The method according to claim 1, wherein the suction pipe is installed on a movable work platform boat.
で形成する請求項１から請求項４のいずれかに記載の水
底の堆砂排出方法。5. The method according to claim 1, wherein the sand discharging pipe is formed by a flexible spiral pipe.
他端の放水管を下流の放水路に開口し、排砂管のサイホ
ン作用により水底の水と堆砂を汲み上げ、放水路に放流
する水底の堆砂排出装置において、前記排砂管内に渦流
を発生させる突条を内壁にスパイラル状に設けたことを
特徴とする水底の堆砂排出装置。6. A suction pipe at one end of a sand discharging pipe is opened at the bottom of the water,
The other end of the water discharge pipe is opened in the downstream water discharge channel, and the bottom of the water and sediment is pumped up by the siphon action of the sand discharge pipe, and the sediment discharge device of the water bottom discharged to the water discharge path has a vortex in the sand discharge pipe. A sediment discharge device at the bottom of a water, wherein a ridge to be generated is provided in a spiral shape on an inner wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29775998A JP4173932B2 (en) | 1998-10-20 | 1998-10-20 | Bottom sediment discharge method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29775998A JP4173932B2 (en) | 1998-10-20 | 1998-10-20 | Bottom sediment discharge method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000120050A true JP2000120050A (en) | 2000-04-25 |
| JP4173932B2 JP4173932B2 (en) | 2008-10-29 |
Family
ID=17850814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29775998A Expired - Fee Related JP4173932B2 (en) | 1998-10-20 | 1998-10-20 | Bottom sediment discharge method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4173932B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100408854B1 (en) * | 2000-10-12 | 2003-12-06 | 레인보우스케이프주식회사 | Apparatus for inhale removing sludge by using siphon principle and method for controlling moving thereof |
| JP2015135056A (en) * | 2010-12-22 | 2015-07-27 | 大成建設株式会社 | Device and method for accumulating dam sediment |
| CN105887768A (en) * | 2015-01-12 | 2016-08-24 | 刘广 | Water impounding reservoir at estuary |
| KR20190036957A (en) * | 2017-09-28 | 2019-04-05 | (주)스타라이트 | Marine organism restrain habitation device of intake |
| KR102002792B1 (en) * | 2017-09-28 | 2019-07-23 | (주)스타라이트 | Marine organism restrain habitation device of intake |
| CN107513986A (en) * | 2017-10-09 | 2017-12-26 | 安徽理工大学 | A kind of multi-level cone shape sand discharge energy dissipator |
| CN109183889A (en) * | 2018-10-30 | 2019-01-11 | 贵州大学 | A kind of Accrete clearing device for small hydropower station |
| CN109183889B (en) * | 2018-10-30 | 2024-03-26 | 贵州大学 | A desilting device for small-size hydropower station |
| JP2020200583A (en) * | 2019-06-05 | 2020-12-17 | 一般財団法人水源地環境センター | Discharge system and method of sediment |
| JP7280753B2 (en) | 2019-06-05 | 2023-05-24 | 一般財団法人水源地環境センター | Sediment discharge system and method |
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| Publication number | Publication date |
|---|---|
| JP4173932B2 (en) | 2008-10-29 |
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