JP2002206221A - Double sheet pile sea bank - Google Patents
Double sheet pile sea bankInfo
- Publication number
- JP2002206221A JP2002206221A JP2001003388A JP2001003388A JP2002206221A JP 2002206221 A JP2002206221 A JP 2002206221A JP 2001003388 A JP2001003388 A JP 2001003388A JP 2001003388 A JP2001003388 A JP 2001003388A JP 2002206221 A JP2002206221 A JP 2002206221A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- sheet pile
- water
- sheet piles
- landfill
- 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.)
- Withdrawn
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
Landscapes
- Revetment (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、廃棄物処分場など
の埋立地用の護岸に採用されている二重矢板式護岸に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double sheet pile type revetment employed as a revetment for a landfill such as a waste disposal site.
【０００２】[0002]
【従来の技術】埋立地、例えば廃棄物処理場などの護岸
を構築する際には、環境保全の観点から、護岸の内外の
透水を遮断して、廃棄物処理場内の汚染物質が外海など
の外水域に拡散するのを防止する必要がある。この必要
性を満たす従来例として、特開平６−１９３０２８号公
報に開示された沿岸域廃棄物処理場の護岸構造がある。
この護岸構造は、図３に示すように、矢板３１を一定間
隔離して軟弱粘土層３０を通って支持層３２まで至らせ
て外周構造体３１とし、その中に中詰め材料３３を充填
している。そして、中詰め材料３３は、粘性土又はそれ
を主成分とする改良土であって、透水係数が１０-5cm／
sec 以下であることを特徴としている。2. Description of the Related Art When constructing a revetment in a landfill, for example, a waste disposal site, from the viewpoint of environmental protection, the water permeability inside and outside the revetment is cut off, and contaminants in the waste disposal site are removed from the open sea. It is necessary to prevent diffusion to the outside waters. As a conventional example satisfying this need, there is a seawall structure of a coastal waste treatment plant disclosed in Japanese Patent Application Laid-Open No. 6-193028.
In this revetment structure, as shown in FIG. 3, sheet piles 31 are separated from each other by a fixed distance and passed through a soft clay layer 30 to a support layer 32 to form an outer peripheral structure 31, into which a filling material 33 is filled. I have. The filling material 33 is a viscous soil or an improved soil containing the same as a main component, and has a water permeability of 10 −5 cm /
It is characterized by being less than sec.
【０００３】同公報においては、この発明によれば、中
詰め材料として粘性土又はそれを主成分とする改良土で
あって、透水係数が１０-5cm／sec 以下のものを用いる
ので、止水性が優れた構造となるとしている。In this publication, according to the present invention, as a filling material, a viscous soil or an improved soil containing the same as a main component and having a water permeability of 10 −5 cm / sec or less is used. It is said that the structure has excellent water-based properties.
【０００４】また、他の従来例として、特開平７−９０
８２６号公報に開示された拡散防止護岸がある。この拡
散防止護岸は、図４に示すように、多数の鋼矢板４１，
４２の継手を噛み合わせて水底地盤４３に打設して、間
隔をおいて配置された２列の鋼矢板護岸４４，４５を構
成し、その鋼矢板護岸４４，４５間に構造材としての砕
石或いは礫４７を投入し、砕石間の水４９を水ポンプ５
１によって貯水槽５３内に排出するというものである。Another conventional example is disclosed in Japanese Patent Application Laid-Open No. 7-90.
There is an anti-diffusion seawall disclosed in Japanese Patent No. 826. As shown in FIG. 4, this diffusion prevention revetment includes a number of steel sheet piles 41,
The two joints are engaged with each other and driven into the underwater ground 43 to form two rows of steel sheet pile revetments 44, 45 spaced apart, and crushed stone as a structural material between the steel sheet pile revetments 44, 45. Alternatively, gravel 47 is put in, and the water 49 between the crushed stones is
1 discharges into the water storage tank 53.
【０００５】２列の鋼矢板護岸４４，４５の間に侵入し
た水は、排水ポンプ５１により貯水槽５３に排水される
ので、２列の鋼矢板護岸４４，４５の間の水位は、各鋼
矢板護岸４４，４５の外側の水位よりも低くなり、した
がって、２列の鋼矢板護岸４４，４５の外側の水は、鋼
矢板４１，４２の継手の間を通って、２列の鋼矢板護岸
４４，４５の間に侵入し、鋼矢板護岸４４，４５付近に
おいては、常に鋼矢板４１，４２の外側から鋼矢板護岸
４４，４５の間を通って、貯水槽５３内に向う水の流れ
が生じるので、汚染物質が拡散することはないというも
のである。[0005] The water that has entered between the two rows of steel sheet pile revetments 44 and 45 is drained by the drainage pump 51 into the water storage tank 53. The water level outside the sheet pile revetments 44, 45 is lower than the water level outside the sheet pile revetments 44, 45, so that the water outside the two rows of steel sheet pile revetments 44, 45 passes between the joints of the steel sheet piles 41, 42, and the two rows of steel sheet pile revetments. In the vicinity of the steel sheet pile revetments 44, 45, the flow of water flowing from outside the steel sheet piles 41, 42 to the inside of the water storage tank 53 always passes between the steel sheet pile revetments 44, 45. Contaminants do not spread out.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記の
従来技術には、以下に示すような問題点がある。まず、
図３に示した特開平６−１９３０２８号公報のもので
は、鋼矢板３１を軟弱粘土層３０を通過して支持層３２
に打設している。しかし、軟弱粘土層３０は不透水では
あるが水平支持力が弱いため、鋼矢板３１に対する支持
力は期待出来ず、鋼矢板３１は支持層３２のみに支持さ
れることになる。しかし、このような支持層３２のみで
鋼矢板３１を支持する構造では、汚染物質の処理場から
の拡散防止はできるとしても護岸としての安定性に欠け
るため、膨大な費用をかけて護岸としての安定性を確保
しなければならないという問題がある。一方、海底地盤
が水平支持力のある砂礫層の場合には透水性が高いた
め、同公報の構造では、砂礫層に設置した鋼矢板３１の
継手部から汚水が鋼矢板３１間に侵入し、その後海側に
侵出して、外水域を汚染してしまうという問題がある。However, the above-mentioned prior art has the following problems. First,
In Japanese Unexamined Patent Publication No. 6-193028 shown in FIG. 3, a steel sheet pile 31 passes through a soft clay layer 30 and a support layer 32 is formed.
Has been cast. However, the soft clay layer 30 is impervious to water, but has a weak horizontal supporting force, so that the supporting force for the steel sheet pile 31 cannot be expected, and the steel sheet pile 31 is supported only by the support layer 32. However, in such a structure in which the steel sheet pile 31 is supported only by the support layer 32, even though the diffusion of the contaminants from the treatment plant can be prevented, the stability as a revetment is lacking. There is a problem that stability must be ensured. On the other hand, when the seabed ground is a gravel layer having a horizontal bearing capacity, the water permeability is high. After that, there is a problem that it intrudes to the sea side and pollutes the outer water area.
【０００７】また、特開平７−９０８２６号公報の発明
では、鋼矢板４１，４２の水没している継手部から鋼矢
板護岸４４，４５間に水が侵入するため、多量の水が護
岸間に入ってくることになり、この水を排水して水位を
コントロールする必要がある。そのため、大雨などの気
象変動に備えて大容量のポンプ及び汚水貯留池を設置し
なければならず設備コストがかかるという問題がある。
また、同公報では海底地盤の性状については触れられて
おらず、軟弱地盤の場合には前記特開平６−１９３０２
８号公報と同様に護岸の安定性に欠けるという問題があ
る。In the invention of Japanese Patent Application Laid-Open No. Hei 7-90826, water enters between the steel sheet pile revetments 44 and 45 from the submerged joints of the steel sheet piles 41 and 42, so that a large amount of water flows between the revetments. It is necessary to drain this water and control the water level. Therefore, there is a problem that a large-capacity pump and a sewage reservoir must be installed in preparation for weather fluctuations such as heavy rain, which increases the equipment cost.
Further, the publication does not mention the properties of the seabed ground, and in the case of soft ground, the above-mentioned Japanese Patent Application Laid-Open No.
There is a problem that the stability of the revetment is lacking similarly to the publication No. 8.
【０００８】本発明はかかる問題点を解決するためにな
されたものであり、コストが安く汚染物質の外水域への
拡散を防止できる二重矢板護岸を得ることを目的として
いる。また、構造的にも安定している二重矢板護岸を得
ることを目的としている。The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a double sheet pile revetment which is inexpensive and can prevent diffusion of pollutants into an external water area. It is also aimed at obtaining a double sheet pile revetment that is structurally stable.
【０００９】[0009]
【課題を解決するための手段】本発明に係る二重矢板護
岸は、鋼矢板を２列状態で複数連結して水底地盤に立設
してなるものにおいて、２列の鋼矢板間に充填された不
透水性の中詰め材と、前記鋼矢板間の水底地盤に連通す
る通路と、該通路に圧縮空気を供給するための圧縮空気
供給手段とを備えたものである。A double sheet pile revetment according to the present invention is constructed by connecting a plurality of steel sheet piles in a two-row state and standing upright on an underwater ground, and is filled between two rows of steel sheet piles. And a passage communicating with the underwater ground between the steel sheet piles, and compressed air supply means for supplying compressed air to the passage.
【００１０】また、一端側が鋼矢板間の水底地盤に連通
すると共に、他端側が埋立地側の想定される最高地下水
位よりも高い位置まで延出する水路と、該水路の上部に
設けられた水栓とを備えたものである。In addition, one end communicates with the underwater ground between the steel sheet piles, and the other end extends to a position higher than the assumed maximum groundwater level on the landfill side, and is provided above the water passage. It is provided with a faucet.
【００１１】また、一端側が鋼矢板間の水底地盤まで連
通すると共に、他端側が想定される埋立地側の最高地下
水位よりも高い位置まで延出する水路と、該水路内の水
位を検出する第１水位検出手段と、埋立地の地下水位を
検出する第２水位検出手段と、これら第１，２水位検出
手段の検出値に基づいて圧縮空気供給手段を駆動制御し
て前記水路内の水位が前記埋立地の水位より高い位置に
保持されるようにしたものである。In addition, one end communicates with the underwater ground between the steel sheet piles, and the other end extends to a position higher than the assumed maximum groundwater level on the landfill side, and a water level in the water passage is detected. A first water level detection means, a second water level detection means for detecting a groundwater level in the landfill, and a drive level of the compressed air supply means based on a detection value of the first and second water level detection means to control a water level in the waterway. Is maintained at a position higher than the water level of the landfill.
【００１２】また、鋼矢板が立設される水底地盤は、支
持力を有するように砂もしくは砂礫を敷設することによ
って、または、砂杭もしくは砂礫杭を打設することによ
って改良された改良地盤であることを特徴とするもので
ある。[0012] The undersea ground on which the steel sheet piles are erected is improved ground by laying sand or gravel so as to have a supporting force, or by laying sand piles or gravel piles. It is characterized by having.
【００１３】[0013]
【発明の実施の形態】実施の形態１．図１は本発明の実
施の形態１の説明図であり、本実施の形態に係る二重矢
板護岸の断面を示している。この護岸構造においては、
鋼矢板１，３が配置される外水域である外海４と埋立地
６の境界部の海底の軟弱粘土層５は、ＳＣＰ（Sand Com
paction Pile）工法などによって地盤改良された水平支
持力のある改良地盤７になっている。ここにＳＣＰ工法
とは、締まった砂杭を地盤に比較的狭い間隔で鉛直方向
に造成し、砂杭周辺の地盤の締固め改良を行う工法であ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is an explanatory view of the first embodiment of the present invention, and shows a cross section of a double sheet pile revetment according to the present embodiment. In this revetment structure,
The soft clay layer 5 on the seabed at the boundary between the open sea 4 which is the open water area where the steel sheet piles 1 and 3 are placed and the landfill 6
The ground has been improved by a paction pile method and the like, and the improved ground 7 has a horizontal bearing capacity. Here, the SCP method is a method in which a compacted sand pile is vertically formed at relatively narrow intervals on the ground to improve the compaction of the ground around the sand pile.
【００１４】この改良地盤７を貫通して鋼矢板１，３が
２列状態で支持地盤９に至るまで打設されている。した
がって、鋼矢板１，３は支持地盤９に支持されると共に
改良地盤７によっても両側部をしっかりと支持されてお
り、水平抵抗力に優れた安定した構造となっている。た
だ、改良地盤７は締まった砂杭からなるものであり、透
水性が高く、そのため鋼矢板１，３の継手部を介して鋼
矢板１，３間に水が侵入することになるが、この点の対
策については後述する。The steel sheet piles 1 and 3 are driven into the support ground 9 in two rows by penetrating the improved ground 7. Therefore, the steel sheet piles 1 and 3 are supported by the supporting ground 9 and both sides are firmly supported by the improved ground 7 as well, and have a stable structure with excellent horizontal resistance. However, the improved ground 7 is made of a tight sand pile and has high permeability, so that water enters between the steel sheet piles 1 and 3 through the joints of the steel sheet piles 1 and 3. The point measures will be described later.
【００１５】鋼矢板１，３間における水底面（改良地盤
７の上面）より上の部分には土砂とセメント系固化材の
混合物からなる不透水性の中詰め材１１が充填されてい
る。このようにセメント系固化材の混合物からなる中詰
め材１１を充填することで、強度の高い中詰めが得ら
れ、剛性の高い土留め壁となる。このため、護岸の幅を
縮小したり、鋼矢板や鋼管矢板の断面を縮小でき、工事
費を低減できる。なお、中詰め材１１の透水係数は１０
-5cm/sec以下である。The portion above the water bottom surface (the upper surface of the improved ground 7) between the steel sheet piles 1 and 3 is filled with an impermeable middle filling material 11 made of a mixture of earth and sand and a cement-based solidifying material. By filling the filling material 11 made of the mixture of the cement-based solidification material in this way, a filling with high strength is obtained, and a rigid retaining wall is obtained. Therefore, the width of the revetment can be reduced, and the cross section of the steel sheet pile or the steel pipe sheet pile can be reduced, and the construction cost can be reduced. Note that the permeability of the middle filling material 11 is 10
-5 cm / sec or less.
【００１６】鋼矢板１，３間には、中詰め材１１を貫い
て水底面（改良地盤７の上面）に連通する通路１５が形
成されている。そして、通路１５の上部には通路１５に
圧縮空気を送るエアコンプレッサ１７が設置されてい
る。また、通路１５と並んで水路１９が設けられてお
り、水路１９は中詰め材１１を貫通して、一端側が水底
面（改良地盤７の上面）に連通すると共に、他端側が埋
立地６側の想定される最高地下水位よりも高い位置まで
延出している。そして、水路１９の上部には水路１９内
の水の有無を確認するための水栓２１が設置されてお
り、水栓２１の高さ位置は埋立地６の想定される最高地
下水位より高い位置になっている。A passage 15 is formed between the steel sheet piles 1 and 3 to penetrate the middle filling material 11 and communicate with the water bottom surface (the upper surface of the improved ground 7). An air compressor 17 that sends compressed air to the passage 15 is provided above the passage 15. In addition, a water channel 19 is provided alongside the passage 15, and the water channel 19 penetrates the filling material 11, and has one end communicating with the water bottom surface (the upper surface of the improved ground 7) and the other end having the landfill 6 side. It extends to a position higher than the assumed maximum groundwater level. A faucet 21 for confirming the presence or absence of water in the waterway 19 is installed at an upper part of the waterway 19, and the height position of the water faucet 21 is a position higher than the assumed maximum groundwater level of the landfill 6. It has become.
【００１７】以上のように構成された本実施の形態の作
用について説明する。鋼矢板１，３間における海底面よ
り上の部分は不透水性の中詰め材１１が充填されている
ので、この部分には外海４及び埋立地６からの浸水はな
い。一方、鋼矢板１，３間における海底面より下の部分
は改良地盤７からなり、この部分には鋼矢板１，３の継
手部を介して外海４又は埋立地６からの浸水があり地下
水が存在する。したがって、後述するエアコンプレッサ
１７による圧縮空気の送り込みがない場合には、通路１
５内の水位はこの地下水の水頭に相当する高さを呈する
ことになる。The operation of the present embodiment configured as described above will be described. Since the portion between the steel sheet piles 1 and 3 above the sea bottom is filled with the impermeable filling material 11, there is no inundation from the open sea 4 and the landfill 6 in this portion. On the other hand, the portion below the sea bottom between the steel sheet piles 1 and 3 is made of the improved ground 7, and in this part there is inundation from the open sea 4 or the landfill 6 through the joints of the steel sheet piles 1 and 3, and groundwater is discharged. Exists. Therefore, when there is no compressed air sent by the air compressor 17 described later, the passage 1
The water level in 5 has a height corresponding to the head of this groundwater.
【００１８】鋼矢板１，３間の改良地盤７の部分への浸
水は、鋼矢板１，３自体が不透水性であることから鋼矢
板１，３の継手部のみからの浸水となり、また、浸水が
生ずるのは海底地盤以下の部分（中詰め材１１の下面よ
り下方の部分）であり、かつ一般に鋼矢板の継手部の透
水係数は１０-4cm/sec程度であることから鋼矢板１，３
間への浸水量はごくわずかである。The infiltration into the portion of the improved ground 7 between the steel sheet piles 1 and 3 is caused only by the joint portions of the steel sheet piles 1 and 3 because the steel sheet piles 1 and 3 themselves are impermeable. The inundation occurs in the portion below the seabed ground (the portion below the lower surface of the middle padding material 11), and the permeability of the joint of the steel sheet pile is generally about 10 -4 cm / sec. , 3
The amount of water infiltration is very small.
【００１９】このように、鋼矢板１，３間には地下水が
存在するものの外部からのあるいは外部への浸水はごく
わずかであり、略閉じた領域になっている。したがっ
て、通路１５にエアコンプレッサ１７によって圧縮空気
を供給して、鋼矢板１，３、中詰め材１１及び不透水の
支持地盤９に囲まれた領域の地下水の水圧を埋立地６側
の地下水の水圧よりも高くすることが可能な状態になっ
ている。以上を前提として、通路１５に圧縮空気を供給
すると、鋼矢板１，３間の地下水の水圧は、図２の説明
図に示すように、埋立地６側の地下水の水圧よりも高く
なる。よって、埋立地６側の地下水が鋼矢板１，３間に
流入することがなく、その結果として汚水が外海４に浸
出するのを防ぐことができる。As described above, although there is groundwater between the steel sheet piles 1 and 3, there is very little inundation from or into the outside, and the area is a substantially closed area. Therefore, compressed air is supplied to the passage 15 by the air compressor 17, and the pressure of the groundwater in the area surrounded by the steel sheet piles 1, 3, the filling material 11, and the impermeable support ground 9 is used to reduce the groundwater pressure in the landfill 6. It is in a state where it can be higher than the water pressure. Assuming the above, when compressed air is supplied to the passage 15, the water pressure of the groundwater between the steel sheet piles 1 and 3 becomes higher than the water pressure of the groundwater on the landfill site 6 side as shown in the explanatory diagram of FIG. Therefore, the groundwater on the landfill 6 side does not flow between the steel sheet piles 1 and 3, and as a result, it is possible to prevent the sewage from leaching into the open sea 4.
【００２０】なお、通路１５に圧縮空気を供給すること
によって鋼矢板１，３間の地下水の水圧が高くなると水
路１９の水位が上昇する。そして、水栓２１を開いて地
下水が出れば鋼矢板１，３間の地下水の水圧が埋立地６
の地下水の水圧より高いことが目視確認できる。また、
水栓２１から出る水の水質を検査することで、鋼矢板
１，３間の水質を検査でき、埋立地６側の汚水が鋼矢板
１，３間側に侵入していないかどうかを確認できる。When the pressure of the groundwater between the steel sheet piles 1 and 3 is increased by supplying compressed air to the passage 15, the water level of the water passage 19 rises. Then, if the faucet 21 is opened and the groundwater comes out, the pressure of the groundwater between the steel sheet piles 1 and 3 is reduced to the landfill 6.
Can be visually confirmed to be higher than the groundwater pressure. Also,
By inspecting the water quality of the water coming out of the faucet 21, the water quality between the steel sheet piles 1 and 3 can be inspected, and it can be confirmed whether or not the wastewater on the landfill 6 side has entered the steel sheet piles 1 and 3 side. .
【００２１】以上のように、本実施の形態の構造によれ
ば、安定した二重矢板護岸であると共に海洋汚染の心配
のないものが得られる。しかも、通路１５に圧縮空気を
送るだけの簡単な構成であり、コストも低減できる。As described above, according to the structure of the present embodiment, it is possible to obtain a stable double sheet pile revetment and one which is free from marine pollution. In addition, the structure is simple enough to send compressed air to the passage 15, and the cost can be reduced.
【００２２】次に、上記構造の構築方法について説明す
る。まず、港湾や河川など水域に隣接する廃棄物処分場
建設予定地の周囲を、ＳＣＰ（Sand Compaction Pile）
工法などにより地盤改良を行い水平抵抗力に優れた改良
地盤７を形成する。そして、改良地盤７を貫通し、支持
地盤９に至るまで鋼矢板１，３（又は鋼管矢板）を一定
間隔離して２列状態で立設する。次に、水底面より上の
鋼矢板１，３間に土砂とセメントまたはセメント系固化
材を攪拌混合した泥状の混合物を充填して不透水性の中
詰め材１１を形成する。中詰め材１１を貫く通路１５、
水路１９となる管材は、施工時の条件により、中詰め材
１１を形成する前に改良地盤７内に挿入して設置しても
中詰め材１１を形成し、ほぼ固化した後に改良地盤７に
至るまで中詰め材１１を削孔して設置しても良い。な
お、セメントと攪拌混合する土砂として、現地の浚渫土
を使用することにより、資源の有効利用となる。その
後、通路１５となる管材にエアコンプレッサ１７の空気
吐出配管を連結する。さらに、水路１９となる管材に水
栓２１を設置して完成する。Next, a method of constructing the above structure will be described. First, the area around the planned site for constructing a waste disposal site adjacent to the water area, such as a port or river, will be covered by a SCP (Sand Compaction Pile).
The ground is improved by a construction method or the like to form an improved ground 7 having excellent horizontal resistance. Then, the steel sheet piles 1 and 3 (or the steel pipe sheet piles) penetrate the improved ground 7 and reach the support ground 9, and are erected in a two-row state with a certain distance therebetween. Next, a mud-like mixture obtained by stirring and mixing earth and sand and cement or cement-based solidifying material is filled between the steel sheet piles 1 and 3 above the water bottom to form an impermeable middle filling material 11. A passage 15 penetrating the filling material 11,
Depending on the conditions at the time of construction, the pipe material which becomes the water channel 19 forms the middle filling material 11 even if it is inserted and installed in the improved ground 7 before forming the middle filling material 11, and is substantially solidified after being solidified. The middle filling material 11 may be drilled and installed until it is reached. In addition, by using local dredged soil as earth and sand to be mixed and mixed with cement, resources can be effectively used. After that, the air discharge pipe of the air compressor 17 is connected to the pipe material serving as the passage 15. Further, a faucet 21 is installed on the pipe material to be the water channel 19 to complete the process.
【００２３】なお、上記の例では鋼矢板１，３間の地下
水の水圧を確認する手段として水栓２１による目視確認
の例を示したが、これ以外にも次のようにしてもよい。
埋立地６に井戸などを設け、埋立地６の地下水位を検出
するための水位計を設置し、水路１９にも同様の水位計
を設置する。そして、これらの水位計の検出値に基づい
てエアコンプレッサ１７を自動制御して、水路１９側の
水位が埋立地６側の水位よりも高くなるように調整す
る。このようにすることで鋼矢板１，３間の地下水の圧
力を埋立地６側の地下水の圧力よりも常に高くなるよう
に自動制御が可能になる。In the above example, the visual check using the faucet 21 has been described as a means for checking the water pressure of the groundwater between the steel sheet piles 1 and 3, but the following method may be used.
A well or the like is provided in the landfill 6, a water level gauge for detecting the groundwater level in the landfill 6 is installed, and a similar water level gauge is installed in the waterway 19. Then, the air compressor 17 is automatically controlled based on the detection values of these water level gauges, and adjusted so that the water level on the waterway 19 side is higher than the water level on the landfill site 6 side. This makes it possible to automatically control the pressure of the groundwater between the steel sheet piles 1 and 3 to be always higher than the pressure of the groundwater on the landfill 6 side.
【００２４】なお、通路１５及びこれに接続するエアコ
ンプレッサ１７は護岸の大きさ、使用する鋼矢板の幅、
改良地盤の深さ等の諸条件によって複数設けるようにし
てもよい。また、水路１９及び水栓２１は護岸の長手方
向に一定の間隔を離して複数設けるのが好ましく、その
数、間隔は用いる鋼矢板の幅、改良地盤の深さ等の諸条
件によって適宜設計時に決定すればよい。The passage 15 and the air compressor 17 connected to the passage 15 have the size of the revetment, the width of the steel sheet pile to be used,
A plurality may be provided depending on various conditions such as the depth of the improved ground. It is preferable to provide a plurality of water passages 19 and faucets 21 at predetermined intervals in the longitudinal direction of the revetment. You only have to decide.
【００２５】また、上記実施の形態においては、海底に
改良地盤７を形成する例を示したが、元々の地盤が砂又
は砂礫の水平抵抗に優れた地盤の場合には改良地盤７を
形成する必要はない。また、改良地盤７を形成する工法
としてＳＣＰ工法を例に挙げたがこれに限られるもので
もない。In the above-described embodiment, an example in which the improved ground 7 is formed on the sea floor has been described. However, when the original ground is ground excellent in horizontal resistance of sand or gravel, the improved ground 7 is formed. No need. Further, the SCP method has been described as an example of the method of forming the improved ground 7, but the method is not limited to this.
【００２６】さらに、上記実施形態においては通路１５
及び水路１９は共に中詰め材１１を貫通して設けている
が、例えば埋立地６側から鋼矢板１，３間の改良地盤７
に亘って配管を設置することによって中詰め材１１を貫
通しない通路１５及び水路１９を設けることも可能であ
る。また、鋼矢板１，３が鋼管矢板の場合、鋼管の内部
空管内に配管を設置することによって中詰め材１１を貫
通しない通路１５および水路１９を設けることも可能で
ある。Further, in the above embodiment, the passage 15
The channel 19 and the water channel 19 are both provided so as to penetrate the filling material 11. For example, the improved ground 7 between the steel sheet piles 1 and 3 from the landfill 6 side
It is also possible to provide a passage 15 and a water passage 19 that do not penetrate the filling material 11 by installing a pipe over the space. When the steel sheet piles 1 and 3 are steel pipe sheet piles, it is also possible to provide a passage 15 and a water passage 19 that do not penetrate the filling material 11 by installing pipes inside the hollow pipe of the steel pipe.
【００２７】[0027]
【発明の効果】以上のように本発明においては、２列の
鋼矢板間に充填された不透水性の中詰め材と、鋼矢板間
の水底地盤まで連通する通路と、該通路に圧縮空気を供
給するための圧縮空気供給手段とを備えたことにより、
通路内に圧縮空気を送り込み鋼矢板間の地下水の圧力を
埋立地の地下水の圧力より高くすることができ、これに
よって埋立地の汚水が二重矢板護岸に侵入するのを防止
でき、その結果として汚水が外水域に浸出することを防
ぐことができる。As described above, according to the present invention, an impervious filling material filled between two rows of steel sheet piles, a passage communicating with the bottom of the floor between the steel sheet piles, and compressed air in the passage. And compressed air supply means for supplying
By sending compressed air into the passageway, the pressure of the groundwater between the steel sheet piles can be higher than the pressure of the groundwater at the landfill, thereby preventing landfill wastewater from entering the double sheet pile revetment, and consequently It is possible to prevent sewage from seeping into the outside water area.
【図１】 本発明の一実施の形態に係る二重矢板護岸の
断面図である。FIG. 1 is a sectional view of a double sheet pile revetment according to an embodiment of the present invention.
【図２】 本発明の一実施の形態の作用を説明する説明
図である。FIG. 2 is an explanatory diagram illustrating the operation of the embodiment of the present invention.
【図３】 従来の二重矢板式護岸の断面図である。FIG. 3 is a sectional view of a conventional double sheet pile type seawall.
【図４】 他の従来の二重矢板式護岸の断面図である。FIG. 4 is a cross-sectional view of another conventional double sheet pile type seawall.
１，３ 鋼矢板 ５ 軟弱地盤 ７ 改良地盤 ９ 支持地盤 １１ 中詰め材 １５ 通路 １７ エアコンプレッサ １９ 水路 ２１ 水栓 1,3 Steel sheet pile 5 Soft ground 7 Improved ground 9 Supporting ground 11 Filling material 15 Passage 17 Air compressor 19 Waterway 21 Water faucet
───────────────────────────────────────────────────── フロントページの続き (72)発明者 南部 俊彦 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 水谷 慎吾 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 岡田 哲一 東京都千代田区四番町５ 東亜建設工業株 式会社内 (72)発明者 山村 和弘 東京都千代田区四番町５ 東亜建設工業株 式会社内 (72)発明者 岸 真裕 東京都千代田区四番町５ 東亜建設工業株 式会社内 Ｆターム(参考） 2D018 BA15 DA00 4D004 AA46 BB04 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiko Nambu 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Shingo Mizutani 1-2-1-2 Marunouchi, Chiyoda-ku, Tokyo Sun (72) Inventor: Tetsuichi Okada 5, Yonbancho, Chiyoda-ku, Tokyo 5 Toa Construction Industry Co., Ltd. (72) Inventor Kazuhiro Yamamura 5: Yonbancho, Chiyoda-ku, Tokyo 5 Toa Construction Industry Co., Ltd. (72) Inventor Masahiro Kishi F-term (reference) 2D018 BA15 DA00 4D004 AA46 BB04 in Toa Construction Industry Co., Ltd. 5 Yonbancho, Chiyoda-ku, Tokyo
Claims (4)
盤に立設してなる埋立地の二重矢板式護岸において、２
列の鋼矢板間に充填された不透水性の中詰め材と、前記
鋼矢板間の水底地盤に連通する通路と、該通路に圧縮空
気を供給するための圧縮空気供給手段とを備えたことを
特徴とする二重矢板式護岸。1. A double sheet pile type revetment in a landfill where a plurality of steel sheet piles are connected in a two-row state and erected on the underwater ground.
An intermediate impervious filling material filled between the steel sheet piles in the row, a passage communicating with the underwater ground between the steel sheet piles, and compressed air supply means for supplying compressed air to the passage. A double sheet pile type revetment characterized by:
と共に、他端側が埋立地側の想定される最高地下水位よ
りも高い位置まで延出する水路と、該水路の上部に設け
られた水栓とを備えたことを特徴とする請求項１記載の
二重矢板式護岸。2. A waterway having one end communicating with the underwater ground between steel sheet piles and the other end extending to a position higher than an assumed maximum groundwater level on the landfill side, and a waterway provided at an upper portion of the waterway. The double sheet pile type revetment according to claim 1, further comprising a faucet.
ると共に、他端側が想定される埋立地側の最高地下水位
よりも高い位置まで延出する水路と、該水路内の水位を
検出する第１水位検出手段と、埋立地の地下水位を検出
する第２水位検出手段と、これら第１，２水位検出手段
の検出値に基づいて圧縮空気供給手段を駆動制御して前
記水路内の水位が前記埋立地の水位より高い位置に保持
されるようにしたことを特徴とする請求項１記載の二重
矢板式護岸。3. A waterway that has one end communicating with the underground between steel sheet piles and the other end extending to a position higher than the assumed maximum groundwater level on the landfill side, and detecting a water level in the waterway. A first water level detection means, a second water level detection means for detecting a groundwater level in the landfill, and a drive level of the compressed air supply means based on a detection value of the first and second water level detection means to control a water level in the waterway. The double sheet pile type revetment according to claim 1, wherein the water is maintained at a position higher than the water level of the landfill.
を有するように砂もしくは砂礫を敷設することによっ
て、または、砂杭もしくは砂礫杭を打設することによっ
て改良された改良地盤であることを特徴とする請求項１
〜３のいずれかに記載の二重矢板式護岸。4. The underground ground on which the steel sheet pile is erected is a ground improved by laying sand or gravel to have a bearing capacity, or by driving a sand pile or a gravel pile. 2. The method according to claim 1, wherein
A double sheet pile type revetment according to any one of (1) to (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001003388A JP2002206221A (en) | 2001-01-11 | 2001-01-11 | Double sheet pile sea bank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001003388A JP2002206221A (en) | 2001-01-11 | 2001-01-11 | Double sheet pile sea bank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002206221A true JP2002206221A (en) | 2002-07-26 |
Family
ID=18871737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001003388A Withdrawn JP2002206221A (en) | 2001-01-11 | 2001-01-11 | Double sheet pile sea bank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002206221A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007144272A (en) * | 2005-11-25 | 2007-06-14 | World Engineering Kk | Additional construction method of water impervious layer |
| JP2008223291A (en) * | 2007-03-12 | 2008-09-25 | Jfe Engineering Kk | Rigid frame bridge formed integrally with revetment and method of constructing same |
-
2001
- 2001-01-11 JP JP2001003388A patent/JP2002206221A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007144272A (en) * | 2005-11-25 | 2007-06-14 | World Engineering Kk | Additional construction method of water impervious layer |
| JP2008223291A (en) * | 2007-03-12 | 2008-09-25 | Jfe Engineering Kk | Rigid frame bridge formed integrally with revetment and method of constructing same |
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