JP4855509B2 - Clogging prevention device for collecting pipe in groundwater drainage mechanism - Google Patents
Clogging prevention device for collecting pipe in groundwater drainage mechanism Download PDFInfo
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- JP4855509B2 JP4855509B2 JP2009237396A JP2009237396A JP4855509B2 JP 4855509 B2 JP4855509 B2 JP 4855509B2 JP 2009237396 A JP2009237396 A JP 2009237396A JP 2009237396 A JP2009237396 A JP 2009237396A JP 4855509 B2 JP4855509 B2 JP 4855509B2
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Description
本発明は地下水排水機構における集水管の目詰り防止装置に係り、特に地滑り誘起地帯の地下水排水用の集水管に適用して好適な集水管の目詰り防止装置に関する。 The present invention relates to a water collecting pipe clogging prevention device in a groundwater drainage mechanism, and more particularly to a water collecting pipe clogging prevention device suitable for application to a water collecting pipe for groundwater drainage in a landslide-induced zone.
一般的に地滑りの活動は地下水位の上昇と密接な関係があり、融雪期や豪雨時には地滑り面付近の間隙水圧が上昇して地滑りが発生することが多い。 In general, landslide activity is closely related to the rise of groundwater level, and during thawing and heavy rain, pore water pressure near the landslide surface increases and landslides often occur.
かかることから地滑りの発生を抑制するためには滑り面付近の地下水を積極的に排除し、間隙水圧を常に低い値に保っておくことが必要であると云われている。 Therefore, in order to suppress the occurrence of landslides, it is said that it is necessary to positively remove the groundwater near the sliding surface and keep the pore water pressure at a low value at all times.
そこで従来から図6に示すように、地滑りが発生する可能性のある地山(1)に多数本の集水管(2)を擁壁(3)を貫通して並列状に埋入し、この集水管(2)内に地下水を集水してその内部を通じ排出させる地下水排水機構が用いられている。 Therefore, as shown in FIG. 6, conventionally, a large number of water collecting pipes (2) are embedded in parallel in the ground (1) where landslide may occur, through the retaining wall (3). A groundwater drainage mechanism that collects groundwater in the water collecting pipe (2) and discharges it through the inside is used.
上記排水機構に用いられる集水管(2)は、一般に周面に多数の集水孔(4),(4)...が穿設され、これら集水孔(4),(4)...を通じて地下水を集水管(2)内に集め、管端の排出口(2a)から地表の排水溝(5)等に排水させるようになされている。ちなみに上記集水管(2)は、通常口径が40〜50mm、長さは順次接続して約50m程度とされ、複数箇所に埋入施工される。 The water collecting pipe (2) used for the drainage mechanism generally has a large number of water collecting holes (4), (4). . . Are formed, and these water collecting holes (4), (4). . . The groundwater is collected in the water collecting pipe (2) through and drained from the discharge end (2a) at the pipe end to the drainage groove (5) on the ground surface. By the way, the water collecting pipe (2) has a diameter of 40 to 50 mm and a length of about 50 m which are sequentially connected to each other, and is embedded in a plurality of places.
しかして上記従来から用いられている地下水排水機構は、その集水管(2)を地中に埋入施工したのちその管端の排出口(2a)から排出させるので集水管(2)の深部まで空気が入り込み、その結果、集水管(2)の外周が乾燥して図8に示すように土砂や赤褐色のヘドロ状スケール(6)が集水孔(4),(4)...から流入して管内に付着したり、さらには植物の根(7)が入り込んだり苔等が緊殖して管底に堆積し、集水孔(4),(4)...が塞がって集水能力を失うことになる。 The groundwater drainage mechanism that has been used in the past, after the drainage pipe (2) is buried in the ground, is discharged from the outlet (2a) at the end of the pipe. As a result, the outer periphery of the water collecting pipe (2) dries, and as shown in FIG. 8, earth and sand or reddish brown sludge scale (6) becomes the water collecting holes (4), (4). . . From the water and adheres to the inside of the pipe, or the root of the plant (7) enters or moss grows and accumulates on the bottom of the pipe, and the water collecting holes (4), (4). . . Will be blocked and lose its ability to collect water.
また鉄分の多い地下水が集水管(2)内に流入して長く滞留すると鉄細菌類が培養されてヘドロ状のスケールが形成され、この形成物が水と一緒に集水管(2)の管端の排出口(2a)から自然流速により流出する際にその排出口(2a)付近の集水管底部に沈澱して付着し、時間の経過と共に酸化して集水管(2)が閉塞状態をきたすような事態を招くことになり、延いては排水機能を失うに至るという問題がある(図7参照)。 In addition, when iron-rich groundwater flows into the water collecting pipe (2) and stays for a long time, iron bacteria are cultured to form sludge-like scales, and this formed material together with water forms the end of the water collecting pipe (2). When it flows out from the discharge port (2a) at a natural flow rate, it settles on and adheres to the bottom of the water collection tube near the discharge port (2a), and oxidizes with the passage of time so that the water collection tube (2) becomes blocked. This leads to a problem that leads to a loss of the drainage function (see FIG. 7).
集水管(2)の管端の排出口(2a)が図7のように閉塞してしまうと排出口(2a)からの流出は不可能となり、その結果地下水は擁壁(3)の裏側に停留し、地下水(8)が徐々に奥の方へ逆流する状態になってかえって地滑りを誘発する結果をもたらすことになる。 If the outlet (2a) at the end of the water collecting pipe (2) is blocked as shown in FIG. 7, it will not be possible to flow out of the outlet (2a), and as a result, groundwater will flow behind the retaining wall (3). It will stop and the groundwater (8) will gradually flow back towards the back, which will result in a landslide.
本発明は、地中に埋設されて地下水を集水し排出する集水管の内面に付着堆積する付着物を、集水した地下水の水圧を利用して自動的に剥離除去して排出させ、集水管の目詰りを未然に防止することを課題としてなされたものである。 The present invention automatically removes and deposits deposits deposited and deposited on the inner surface of a water collecting pipe that is buried in the ground and collects and discharges groundwater, using the water pressure of the collected groundwater to discharge it. The object was to prevent clogging of the water pipes.
上記課題を解決する手段として本発明は、地下水を集水して排出させる地下水排水機構において、地中に埋入され周面に多数の集水孔が開設された集水管と、スクリュー羽根を有し、前記集水管内に同心的に回転自在に挿通された土砂排出軸とを備え、前記集水管内を流れる水流の水圧によって土砂排出軸が回転することによりそのスクリュー羽根で集水管内に浮遊してその内壁に付着堆積しようとする付着物を剥離除去し、水流に乗せて自動的に排出するようにしたことにある。 As means for solving the above-mentioned problems, the present invention provides a groundwater drainage mechanism for collecting and discharging groundwater, and has a water collection pipe embedded in the ground and having a number of water collection holes on its peripheral surface, and a screw blade. And a sediment discharge shaft that is concentrically rotatably inserted into the water collection pipe, and the sediment discharge shaft is rotated by the water pressure of the water flowing through the water collection pipe, so that the screw blades float in the water collection pipe. Then, the deposits which are to be deposited and deposited on the inner wall are peeled and removed, and are automatically discharged on a water stream.
上記地下水排水機構は、地滑りが発生することを危惧される地帯に設置するのに好適である。 The groundwater drainage mechanism is suitable for installation in a zone where landslides are a concern.
前記土砂排出軸は、放射方向に突設された複数枚の羽根を1組とするスクリュー羽根を有し、これを軸方向に所要の間隔を置いて複数組配設する構成、スクリュー羽根を螺旋状としてこれを断続的に配設する構成、さらにはこのスクリュー羽根を連続的に配設する構成とする態様を選択することができる。 The earth and sand discharge shaft has screw blades each having a plurality of blades protruding in the radial direction, and a plurality of screw blades arranged in the axial direction at a predetermined interval. It is possible to select a configuration in which the screw blades are disposed intermittently as a shape, and further, a configuration in which the screw blades are continuously disposed.
本発明によれば、地中の埋設して地下水を集水する集水管の内面に付着堆積する付着物を該管内に流入して管端の排出口に至る水流による圧力によって自己回転する土砂排出軸のスクリュー羽根により剥離除去して水流に乗せて地表に排出させるので、外部から何らかの駆動力(エネルギー)を付与することなく簡単な構成の下で自己完結機能によって目詰りを確実に防止することができ、メンテナンスも不要とすることができる。 According to the present invention, the sediment discharged by self-rotation by the pressure of the water flow that flows into the pipe and reaches the discharge port at the end of the pipe while depositing and depositing on the inner surface of the water collecting pipe buried in the ground and collecting groundwater. Since it is peeled and removed by the screw blades of the shaft, it is put on the water stream and discharged to the ground surface, so that clogging is reliably prevented by a self-contained function under a simple configuration without applying any driving force (energy) from the outside. And maintenance is unnecessary.
土砂排出軸のスクリュー羽根を螺旋翼が断続または連続する構成とすれば、これら螺旋翼の回転により管内付着物の剥離機能に加えスクリューコンベア機能が加味されて一層土砂類の排出効果を高めることができる。 If the screw blades of the earth and sand discharge shaft are configured so that the spiral blades are intermittent or continuous, the rotation of these spiral blades will add to the function of removing the deposits in the pipe and add to the screw conveyor function to further increase the sediment discharge effect. it can.
図1は本発明における集水管の目詰り防止装置の一実施形態を示し、一部を斜視的に示す断面図で、集水管(2)自体は従来のものと同様、その周面に多数の集水孔(4),(4)...が穿設されており、内径40〜50mm程度のパイプ材で構成されている。 FIG. 1 shows an embodiment of a water collecting pipe clogging prevention device according to the present invention, and is a sectional view partially showing a perspective view. The water collecting pipe (2) itself has a large number of peripheral surfaces as in the prior art. Water collecting holes (4), (4). . . Is made of a pipe material having an inner diameter of about 40 to 50 mm.
本発明においては上記集水管(2)内にこれと同心的に土砂排出軸(10)が回転自在に挿入されている。 In the present invention, the earth and sand discharge shaft (10) is rotatably inserted into the water collecting pipe (2) concentrically therewith.
上記土砂排出軸(10)は、シャフト(11)にその軸線方向に所要の間隔を置いてスクリュー羽根(12),(12)...が取り付けられている。 The earth and sand discharge shaft (10) has screw blades (12), (12),. . . Is attached.
図1に示す実施形態におけるスクリュー羽根(12)は、図2に図1のA−A矢視図として示すようにプロペラ状に撚られた状態の3枚の羽根(12a),(12a),(12a)が放射方向に等間隔に突設されたもので、その先端は集水管(2)の内周面に可及的近接する長さを有している。 The screw blade (12) in the embodiment shown in FIG. 1 has three blades (12a), (12a) in a state of being twisted in a propeller shape as shown in FIG. (12a) is projected at equal intervals in the radial direction, and its tip has a length as close as possible to the inner peripheral surface of the water collecting pipe (2).
前記土砂排出軸(10)のシャフト(11)は軸受部材(13)に挿通され、この軸受部材(13)は等間隔に3本の脚(13a),(13a),(13a)を有し、これら脚(13a),(13a),(13a)の先端が集水管(2)の内周面に接触してシャフト(11)を安定状態に支えるようになっている。 The shaft (11) of the earth and sand discharge shaft (10) is inserted through a bearing member (13), and this bearing member (13) has three legs (13a), (13a), (13a) at equal intervals. The tips of the legs (13a), (13a), and (13a) come into contact with the inner peripheral surface of the water collecting pipe (2) to support the shaft (11) in a stable state.
なお前記軸受部材(13)は、集水管(2)の内面にそって圧入する構成とするときは軸受部材(13)に対しシャフト(11)が自由に回転できるようにされ、軸受部材(13)の脚(13a),(13a)...を集水管(2)の内面に圧接させない場合にはシャフト(11)と共に回転できるようにされるが、いずれの構成とするかは任意である。 When the bearing member (13) is configured to be press-fitted along the inner surface of the water collecting pipe (2), the shaft (11) can be freely rotated with respect to the bearing member (13). ) Legs (13a), (13a). . . Can be rotated together with the shaft (11) when it is not brought into pressure contact with the inner surface of the water collecting pipe (2), any configuration is arbitrary.
図3および図4は、前記スクリュー羽根(12)の構成を螺旋翼形態とした場合の実施形態を示すもので、図3は螺旋翼(12b)を断続状に軸(11)に設けたものであり、図4は螺旋翼(12b)を連続状に軸(11)に設けたものである。いずれの形態の場合も、螺旋翼(12b),(12b)が剥離された土砂類の下流方向へ搬送する機能が強化され、一層土砂類の排出効果が高められる。 3 and 4 show an embodiment in which the configuration of the screw blade (12) is in the form of a spiral blade, and FIG. 3 shows an embodiment in which the spiral blade (12b) is provided intermittently on the shaft (11). FIG. 4 shows a spiral blade (12b) continuously provided on the shaft (11). In any case, the function of conveying the earth and sand from which the spiral blades (12b) and (12b) have been peeled is enhanced, and the effect of discharging earth and sand is further enhanced.
図5は本発明を用いた地下水排水機構の一例を示すもので、集水管(2)を擁壁(3)を貫通して地山(1)に所要長さにわたりやる上昇傾斜させて埋入し、その管端を擁壁(3)外に突出させ、その管端に逆U字形のシール管(14)(トラップ)が接続され、そのシール管(14)のシール部(14a)の手前に排出土砂を集めるタンク(15)が接続されており、このタンク(15)の下部には集められた土砂類を適時に排出させるための土砂類排出用バルブ(16)が設けられている。 FIG. 5 shows an example of a groundwater drainage mechanism using the present invention, in which a water collecting pipe (2) is embedded through a retaining wall (3) and inclined to the ground (1) over a required length. The tube end protrudes outside the retaining wall (3), and an inverted U-shaped seal tube (14) (trap) is connected to the tube end, before the seal portion (14a) of the seal tube (14). A tank (15) for collecting discharged earth and sand is connected to the tank, and a sediment discharge valve (16) for discharging the collected earth and sand in a timely manner is provided at the lower part of the tank (15).
次に作用について説明する。 Next, the operation will be described.
図1、図2に示す実施形態においては、集水管(2)を地滑り地帯の地山に勾配を付けて埋入施工すれば、地山の地下水は集水管(2)の集水孔(4),(4)...から管内に流入し、水流となって管端の排出口(2a)へ向けて流動する。 In the embodiment shown in FIG. 1 and FIG. 2, if the water collecting pipe (2) is embedded in the ground in the landslide area with a gradient, the groundwater in the ground will be collected in the water collecting hole (4) of the water collecting pipe (2). ), (4). . . Flows into the pipe and flows as a water stream toward the outlet (2a) at the pipe end.
集水される水量が増すと、その水流による圧力によりスクリュー羽根(12),(12)...が回転し、その回転により集水管(2)の内壁に付着堆積しようとする土砂類がスクリュー羽根(12),(12)...の先端によって掻き取られ、掻き落された土砂類はスクリュー羽根(12)による推力と集水管(2)内を流れる水流によって管端の排出口(2a)へ向けて流れ、その排出口(2a)から外部に地下水と共に排出される。 When the amount of water collected increases, the screw blades (12), (12). . . And the earth and sand to be deposited and deposited on the inner wall of the water collecting pipe (2) by the rotation of the screw blades (12), (12). . . The earth and sand scraped off by the tip of the pipe flows toward the outlet (2a) at the end of the pipe by the thrust generated by the screw blade (12) and the water flow flowing in the water collecting pipe (2), and the outlet (2a ) To the outside along with groundwater.
図3、図4に示すような螺旋翼(12b)によるスクリュー羽根の構成とすれば、螺旋翼(12b)が前記と同様に水圧を受けて回転すると共に集水管(2)の内壁に付着堆積する土砂類が掻き取られ、掻き取られた土砂類は螺旋翼(12b)によるスクリューコンベアとしての機能により下流方向へ送られ、排出口(2a)から排出される。 If the configuration of the screw blade by the spiral blade (12b) as shown in FIG. 3 and FIG. 4 is used, the spiral blade (12b) rotates by receiving water pressure as described above and adheres to the inner wall of the water collecting pipe (2). The earth and sand to be scraped are scraped off, and the scraped earth and sand are sent in the downstream direction by the function of the screw conveyor by the spiral blade (12b) and discharged from the discharge port (2a).
図4示の実施形態によれば、螺旋状をなすスクリュー羽根(12)が前記実施形態の場合と同様に水圧により回転して堆積土砂類を剥離すると同時にスクリュー羽根(12)によってスクリューコンベアの機能により下流へ運ばれ、排出口(2a)から地上に排出される。 According to the embodiment shown in FIG. 4, the screw blade (12) having a spiral shape is rotated by water pressure in the same manner as in the above-described embodiment to peel off sedimentary sediments and at the same time, the screw blade (12) functions as a screw conveyor. And is discharged downstream from the discharge port (2a).
図5の実施形態を採用すれば、排出土砂が地山外に垂れ流しにならず、タンク(15)内に回収して一括排除することができ、環境を汚すこともない。 If embodiment of FIG. 5 is employ | adopted, discharged earth and sand will not spill out of a natural ground, but it can collect | recover in a tank (15), can be removed collectively, and does not pollute the environment.
2 集水管
2a 排出口
3 擁壁
4 集水孔
5 排出溝
10 土砂排出軸
11 シャフト
12 スクリュー羽根
12a 羽根
12b 螺旋翼
13 軸受部材
14 シール管
2
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