JP5782734B2 - Wall sheet with liquefaction measures and steel sheet pile with liquefaction suppression function - Google Patents

Wall sheet with liquefaction measures and steel sheet pile with liquefaction suppression function Download PDF

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JP5782734B2
JP5782734B2 JP2011029905A JP2011029905A JP5782734B2 JP 5782734 B2 JP5782734 B2 JP 5782734B2 JP 2011029905 A JP2011029905 A JP 2011029905A JP 2011029905 A JP2011029905 A JP 2011029905A JP 5782734 B2 JP5782734 B2 JP 5782734B2
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steel sheet
sheet pile
liquefaction
drainage member
opening
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JP2012167496A (en
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幸生 才村
幸生 才村
和孝 乙志
和孝 乙志
彰久 亀山
彰久 亀山
小林 洋一
洋一 小林
田中 宏征
宏征 田中
輝樹 西山
輝樹 西山
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Nippon Steel Corp
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Description

本発明は、地震時に液状化が発生する恐れのある地盤に設ける、または設けられた盛土状構造物、各種地中構造物、護岸等の液状化対策を施すための壁体、および該壁体に用いることができる液状化抑止機能を有する鋼矢板に関するものである。   The present invention provides a wall for providing liquefaction countermeasures such as embankment-like structures, various underground structures, revetments, etc., provided on or in a ground where liquefaction may occur during an earthquake, and the wall The present invention relates to a steel sheet pile having a liquefaction inhibiting function that can be used in the manufacturing process.

埋立地その他、地震時に液状化が発生する恐れのある地盤においては、液状化対策として、地盤中に排水機能のあるドレーン材を打設したり、あるいは矢板や杭等に排水部材を取り付けて打設し、地震時にこれらの排水部材を通じて過剰間隙水圧を逸散させることで液状化を抑制する技術が各種開発されている(例えば、特許文献1〜7参照)。   In landfills and other grounds where liquefaction may occur during earthquakes, drainage materials with drainage function can be placed in the ground, or drainage members can be attached to sheet piles or piles as countermeasures for liquefaction. Various technologies have been developed to suppress liquefaction by dissipating excess pore water pressure through these drainage members during an earthquake (see, for example, Patent Documents 1 to 7).

また、護岸としての矢板壁については、矢板壁で締め切られることにより地下水の流れが遮断され、水辺の自然環境が損なわれるのを防止するため、矢板壁本体に透水孔を設けたものが知られている(例えば、特許文献8参照)。   In addition, as for the sheet pile wall as a revetment, in order to prevent the flow of groundwater from being blocked by the sheet pile wall and damaging the natural environment of the waterside, a sheet pile wall body provided with a water permeable hole is known. (For example, refer to Patent Document 8).

その他、特許文献9には、液状化対策用の鋼矢板において、地震時の過剰間隙水圧を中空の排水部材内へ誘導し、逸散させるための通水孔を矢板本体に設けたものが記載されている。   In addition, Patent Document 9 describes a steel sheet pile for liquefaction countermeasures in which a water passage hole is provided in the sheet pile main body to induce and dissipate excess pore water pressure during a earthquake into a hollow drainage member. Has been.

特開昭55−142815号公報JP-A-55-142815 実開昭56−116434号公報Japanese Utility Model Publication No. 56-116434 特公平06−011990号公報Japanese Patent Publication No. 06-011990 特開平11−158862号公報Japanese Patent Laid-Open No. 11-158862 特開平02−225712号公報Japanese Patent Laid-Open No. 02-225712 特開平10−168868号公報JP-A-10-168868 特開平11−117284号公報Japanese Patent Laid-Open No. 11-117284 特開2003−336252号公報JP 2003-336252 A 特開平09−242100号公報JP 09-242100 A

背景技術の項で述べたように、盛土、護岸等に液状化対策用の壁体を設置する場合、例えば図8に示すように、液状化抑止用の排水部材33を取り付けた多数の鋼矢板32を、継手を介して連結して壁体31を構築するが、その壁体31が透水性の高い地盤34に設けられた場合、常時において地下水の円滑な流れを阻害するため、壁体背後の地点では、井戸枯れや図の右側に示すような形で水位低下を引き起こす恐れがある。   As described in the background art section, when installing a liquefaction countermeasure wall on embankment, revetment, etc., as shown in FIG. 8, for example, a number of steel sheet piles attached with drainage members 33 for liquefaction suppression 32 are connected via a joint to construct the wall body 31. When the wall body 31 is provided on the ground 34 having high water permeability, the smooth flow of groundwater is obstructed at all times. At this point, there is a risk that the water level will drop in the form as shown in the right side of the figure.

また、同じく背景技術の項で述べたように、液状化抑止の目的ではなく、矢板壁によって地下水の流れが遮断され、水辺の自然環境が損なわれるのを防止するために、矢板壁本体に透水孔を設けたものが知られており、常時はその目的を果たすが、地震時に液状化が発生すると、砂が流体のように挙動するため、透水孔から土砂が壁体の向こう側に流れ出て液状化対策の効果が著しく低下することになる。   Also, as described in the background section, the sheet pile wall body is not designed to prevent liquefaction, but to prevent the groundwater flow from being blocked by the sheet pile wall and damaging the natural environment of the waterside. The one with holes is known, and it always serves its purpose, but when liquefaction occurs during an earthquake, the sand behaves like a fluid, so the earth and sand flows out from the water-permeable hole to the other side of the wall. The effect of liquefaction countermeasures will be significantly reduced.

一例として、盛土の法尻に、排水機能がなく透水孔のある壁体を設けた場合、地盤の液状化時には、盛土の上載圧により盛土側地盤の過剰間隙水圧が盛土反対側地盤のそれより高いので、壁体の透水孔を通じて土砂が盛土側からその反対側に移動する。同時に土砂も当該開口部を通じて盛土反対側に流れるので、盛土が大きく沈下しうる。   As an example, when a wall body without drainage function and water permeability is provided at the bottom of the embankment, when the ground is liquefied, the excess pore water pressure of the embankment side ground is higher than that of the ground opposite to the embankment due to the overload pressure of the embankment Since it is high, the earth and sand moves from the embankment side to the opposite side through the water-permeable holes in the wall. At the same time, the earth and sand also flows to the opposite side of the embankment through the opening, so that the embankment can sink greatly.

また別の例として、地中構造物の保護対策として排水機能がなく開口のある壁体を設置する場合を想定する。地中構造物(例えば地中に埋設された地下共同溝等)は、地盤の液状化時浮上り被害を受けやすいため、この対策として、当該構造物両側に壁体を設置して地盤を締め切り、構造物の下方への土砂の回り込みを阻止するのが効果的である。   As another example, a case is assumed where a wall body having an opening without a drainage function is installed as a protection measure for underground structures. Underground structures (such as underground underground trenches buried in the ground) are susceptible to floating damage when the ground is liquefied, so as a countermeasure against this, install walls on both sides of the structure to close the ground. It is effective to prevent the earth and sand from going around the structure.

しかし、単に透水孔を壁体に設けただけであれば、壁体の外側地盤の方が構造物側地盤よりも過剰間隙水圧が高いので、土砂は壁体外側から地中構造物側に開口部を通じて移動し、構造物の浮き上がりを招きうる。   However, if the permeable holes are simply provided in the wall body, the excess ground water pressure is higher on the outer ground of the wall than on the structure-side ground, so the earth and sand opens from the outer side of the wall to the underground structure side. It moves through the part and can cause the structure to rise.

本発明は、このような課題の解決を図ったものであり、地震時に液状化の恐れが高く、常時には透水性の良い砂層を有する地盤において、液状化抑止用に排水機能を付与するとともに、地下水流への阻害を小さくする透水孔を設けた壁体および鋼矢板を提供することを目的としたものである。   The present invention is intended to solve such problems, and is highly liable to liquefaction during an earthquake, and in a ground having a sand layer with good water permeability at all times, while providing a drainage function for liquefaction suppression, An object of the present invention is to provide a wall body and a steel sheet pile provided with a water permeable hole for reducing the hindrance to the groundwater flow.

本願の請求項1に係る液状化対策を施した壁体は、壁方向に連設した鋼矢板からなり、少なくとも片面に液状化抑止用の排水部材を取り付けた連続壁体において、前記排水部材は、鋼矢板本体に取り付けられた通水孔を有する溝形状鋼材からなり、前記鋼矢板本体に平常時における地下水の透水用の開口部を設けてあり、前記開口部前記排水部材の鋼矢板本体への設置範囲外に、排水部材を挟んで千鳥状になるように設けるとともに、前記排水部材を鋼矢板本体に溶接で接合することで、前記開口部による鋼矢板本体の断面欠損による強度低下を補うようにしたことを特徴とするものである。 The wall body subjected to the liquefaction countermeasure according to claim 1 of the present application is made of a steel sheet pile arranged continuously in the wall direction, and the drainage member is a continuous wall body attached with a drainage member for suppressing liquefaction on at least one side. consists groove shape steel having an attached water passing holes on the steel sheet pile body, is provided with an opening for permeability of groundwater in normal times in the steel sheet pile body, steel sheet pile body of the drainage member said opening Outside the installation range, the drainage member is provided in a zigzag shape, and the drainage member is joined to the steel sheet pile main body by welding, thereby reducing the strength due to the cross-sectional defect of the steel sheet pile main body due to the opening. It is characterized by supplementing .

本発明の対象となる壁体本体は、最も一般的には鋼矢板壁であり、鋼矢板の両端に形成された継手により多数の鋼矢板を連設し、盛土、地中構造物の液状化対策用壁体、あるいは護岸、岸壁等としての壁体が構成される。   The wall body that is the subject of the present invention is most commonly a steel sheet pile wall, and a large number of steel sheet piles are connected by joints formed at both ends of the steel sheet pile, and embankment, liquefaction of underground structures A wall for countermeasures or a wall as a revetment or quay is constructed.

鋼矢板の場合、U型鋼矢板、左右非対称継手により同じ向きで接続可能なハット形鋼矢板、Z形鋼矢板、直線形鋼矢板、それらの組合せ鋼矢板、軽量鋼矢板、あるいはH形鋼とハット形鋼矢板の組合せ鋼矢板、ないしはH形鋼とSM−Jパイル(商品名)を組合せた組合せ鋼矢板、鋼管矢板等があるが、特に限定されない。 In the case of steel sheet piles, U-shaped steel sheet piles, hat-shaped steel sheet piles that can be connected in the same direction by left and right asymmetric joints, Z-shaped steel sheet piles, linear steel sheet piles, their combined steel sheet piles, lightweight steel sheet piles, or H-shaped steel and hats combination sheet pile of shaped steel sheet pile, or a combination sheet pile which combines H-beams and SM-J pile (trade name), there is a steel sheet pile, etc., have such limited.

状化は地表から20m以内程度の深さにおいて間隙水が飽和状態の比較的ゆるい砂地盤や砂質土地盤、あるいは、シルト質砂地盤、礫混り砂質地盤等において生じる可能性が高く、液状化対策のための排水部材も現地地盤に応じて液状化の恐れの高い範囲に取り付ければよい。また、開口部も地下水流のある透水性の高い層に設けるのが効率よい。液状化の恐れの高い地盤は一般に透水性の高い地盤でもあるので、排水部材の取付範囲と透水用開口部を設ける範囲とはほぼ同じである場合が多い。 Liquefaction is relatively loose sand soil and sandy land Release of interstitial water saturation at a depth of within about 20m from the ground, or silty sand soil, likely occur in Tsubute混Ri sandy soil, etc. Also, drainage members for liquefaction measures may be attached within a high risk of liquefaction according to the local ground. It is also efficient to provide the opening in a highly permeable layer with a groundwater flow. Since ground with high risk of liquefaction is generally ground with high water permeability, the attachment range of the drainage member and the range in which the opening for water permeability is provided are often almost the same.

常時には、壁体本体に透水用の開口部が形成されていることで、地下水の円滑な流れが阻害されることなく、従来、課題であった壁体背後における井戸枯れや水位低下の問題が解決される。   At all times, the wall body is formed with a water-permeable opening so that the smooth flow of groundwater is not hindered. Solved.

一方、地震時には、従来の液状化対策工と同様、壁体表面あるいは近傍の排水部材を通じて、過剰間隙水圧が逸散され、壁体周囲の地盤の液状化が抑止され地盤を構成する土が泥水状になることがない。そのため、単に地下水の流れが遮断され、水辺の自然環境が損なわれるのを防止するために矢板壁に開口部のみを設けた場合のように、開口部から土砂が流れ出て液状化対策の効果を失なわせるといった恐れもない。 On the other hand, in the event of an earthquake, as with conventional liquefaction countermeasures, excess pore water pressure is dissipated through the drainage members on the surface of the wall or in the vicinity, and liquefaction of the ground around the wall is suppressed, and the soil that constitutes the ground is muddy water. It does not become a shape. Therefore, the earth and sand flows out from the opening to prevent the liquefaction countermeasures, as in the case where only the opening is provided in the sheet pile wall in order to prevent the flow of groundwater from being blocked and the natural environment of the waterside from being damaged. fear not name, such as causing lost.

水部材が壁体本体に取り付けられている場合、壁***置での液状化抑止効果が確実となり、また運搬や地盤への打設作業において効率がよい。 If drainage member is attached to the wall body, liquefaction deterrent at wall position is ensured, also it is efficient at hitting設作industry to transport and ground.

排水部材は全部が壁体本体に取り付けられている必要はなく、一部が地盤中で壁体本体から離れて配置されていてもよく、排水部材の分散配置により、効率のよい液状化対策が可能となる。   The drainage members need not all be attached to the wall body body, and some of them may be placed away from the wall body body in the ground. It becomes possible.

請求項2は、請求項1に係る液状化対策を施した壁体において、前記鋼矢板は左右非対称継手により同じ向きで接続可能なハット形鋼矢板またはSM−Jパイルであり、前記開口部をフランジまたはウェブに設けてあることを特徴とするものである。   Claim 2 is a wall body to which countermeasures against liquefaction according to claim 1 are applied, wherein the steel sheet pile is a hat-shaped steel sheet pile or SM-J pile that can be connected in the same direction by a left-right asymmetric joint, and the opening portion is It is provided in a flange or a web.

求項1または2に係る液状化対策を施した壁体において、排水部材鋼矢板本体に取り付けられた通水孔を有する溝形状鋼材からなる。 In wall subjected to liquefaction measures according to Motomeko 1 or 2, wastewater member ing from the groove-shaped steel having a water-passing hole which is attached to a steel sheet pile body.

剛性の高い溝形状鋼材が排水部材として鋼矢板本体と一体化しているので、打設が容易であるとともに鋼矢板本体の開口による強度低下を補える効果を持つ。   Since the highly rigid groove-shaped steel material is integrated with the steel sheet pile main body as a drainage member, it is easy to place and has an effect of compensating for strength reduction due to the opening of the steel sheet pile main body.

請求項は、請求項1または2に係る液状化対策を施した壁体において、前記開口部の一部を、前記排水部材の壁体本体への設置範囲内に設けることにより、前記排水部材からの前記開口部を通じての排水も可能としてあることを特徴とするものである。 Claim 3 is a wall body to which countermeasures against liquefaction according to claim 1 or 2 are applied, wherein a part of the opening is provided within an installation range of the drainage member on the wall body, whereby the drainage member It is also possible to drain water from the opening through the opening.

排水部材と壁体本体の開口部を連通させることで、地震時の過剰間隙水圧を壁体の開口部からも逸散させ、排水部材を取り付けた側の地盤と反対側の地盤も液状化を抑止することができ、液状化抑止を効率化ならしめることができる。   By connecting the drainage member and the opening of the wall body, excess pore water pressure at the time of the earthquake is dissipated from the opening of the wall body, and the ground on the side opposite to the ground where the drainage member is attached is also liquefied. It can be deterred and liquefaction deterrence can be made more efficient.

排水部材が孔開き溝形状鋼材であって、壁体本体と溝形状鋼材で液状化抑止の排水路を形成し、壁体本体開口部が溝形鋼取り付け幅範囲に設ける場合には、開口部にもフィルターを取り付けるなどの処置をして液状化時土砂浸入防止のため措置を講じておくのがよい。これにより、常時の透水性の維持を図り、地震時には壁体両側の液状化を抑止することができ効率的である。   When the drainage member is a perforated groove-shaped steel material, and the wall body body and the groove-shaped steel material form a drainage channel for preventing liquefaction, and the wall body body opening is provided in the grooved steel mounting width range, the opening In addition, it is recommended to take measures such as attaching a filter to prevent the invasion of sediment during liquefaction. As a result, maintenance of water permeability at all times can be achieved, and liquefaction on both sides of the wall body can be suppressed during an earthquake, which is efficient.

請求項、請求項1、2または3に係る液状化対策を施した壁体において、前記開口部の面積の総和が、壁体投影面積の0.1〜2%となるようにしたことを特徴とするものである。 In the wall body which applied the countermeasure against liquefaction concerning Claim 4 , Claim 1, 2, or 3 , The total of the area of the said opening part was made into 0.1 to 2% of a wall body projected area. It is a feature.

壁体投影面積に対する開口部の面積の総和の比率(開口率)は、鋼矢板等からなる壁体本体の強度が低下させないためには、必要最小限であることが好ましく、かつ必要な透水流量を確保する必要がある。   The ratio of the total area of the openings to the wall projection area (opening ratio) is preferably the minimum necessary to prevent the strength of the wall body made of steel sheet piles, etc., and the necessary water flow rate. It is necessary to ensure.

開口率は、大きくすれば壁体設置前後の流量比が大きく支障が少ないが壁体の断面性能が低下する。流量比が大きく取れ断面性能の低下が大きくない範囲が好適である。   If the aperture ratio is increased, the flow rate ratio before and after the wall body installation is large and there are few obstacles, but the cross-sectional performance of the wall body is degraded. A range in which the flow rate ratio is large and the deterioration of the cross-sectional performance is not large is preferable.

開口率は、図8に示すように0.1〜2%以内程度なら、通常の本発明の鋼矢板の適用がふさわしい地盤であれば透水流量の70〜95%程度を確保できる。   As shown in FIG. 8, if the opening ratio is about 0.1 to 2% or less, about 70 to 95% of the water permeation flow rate can be secured if the ground is suitable for application of the steel sheet pile of the present invention.

開口率を0.1%以上とすることで、条件にもよるが、流量比を適用可能な最小限の70%程度以上確保できる。さらに開口率を2%以内とすることで、一般に、鋼矢板の断面係数は70%以上確保でき、かつ断面二次モーメントは95%以上確保できるので、必要な性能を備えつつ鋼矢板壁の型式アップによる重量増大による経済負担を極力抑えることができる。   By setting the aperture ratio to 0.1% or more, although depending on the conditions, it is possible to secure a minimum of about 70% to which the flow rate ratio can be applied. Furthermore, by setting the aperture ratio to within 2%, the section modulus of the steel sheet pile can generally be secured at 70% or more, and the secondary moment of section can be secured at 95% or more. Economic burden due to weight increase due to up can be minimized.

さらにより好ましい範囲は、通常要求される、壁体設置前後の流量比が85%以上の確保が可能で、開口による断面性能の低下の少ない(断面係数が85%以上確保できかつ断面二次モーメントが95%以上確保できる)、開口率0.3〜1%以内の範囲である。   An even more preferable range is a normally required flow rate ratio before and after wall installation of 85% or more, and a decrease in cross-sectional performance due to opening (a cross-section coefficient of 85% or more can be secured and a secondary moment of section). Is 95% or more), and the aperture ratio is within a range of 0.3 to 1%.

開口部の位置は、一般に地盤の透水性のよい層に対応する位置である。   The position of the opening is generally a position corresponding to a water-permeable layer of the ground.

開口部の孔形状は、円形、矩形、長孔、これらの孔の複数連孔など特に限定されないが、対象の透水地盤が一様の透水性を持つ(すなわち均一な地盤)であれば、透水性が一様に確保されるよう、それぞれの孔面積と孔どうしの開孔ピッチがほぼ同程度となるようにするのがよい。   The hole shape of the opening is not particularly limited, such as a circular shape, a rectangular shape, a long hole, and a plurality of continuous holes. However, if the target permeable ground has uniform water permeability (that is, uniform ground), the water permeability It is preferable that the hole area of each hole and the opening pitch between the holes are substantially the same so that the property is ensured uniformly.

請求項に係る液状化抑止機能を有する鋼矢板は、少なくとも片面に液状化抑止用の排水部材が取り付けられた鋼矢板において、前記排水部材は、鋼矢板本体に取り付けられた通水孔を有する溝形状鋼材からなり、前記鋼矢板本体に平常時における地下水の透水用の開口部を設けてあり、前記開口部の少なくとも一部は前記排水部材の鋼矢板本体への設置範囲外に、排水部材を挟んで千鳥状になるように設けるとともに、前記排水部材を鋼矢板本体に溶接で接合することで、前記開口部による鋼矢板本体の断面欠損による強度低下を補うようにしたことを特徴とするものである。 The steel sheet pile having a liquefaction suppression function according to claim 5 is a steel sheet pile in which a drainage member for liquefaction suppression is attached to at least one side, and the drainage member has a water passage hole attached to the steel sheet pile main body. consists groove shape steel, is provided with an opening for permeability of groundwater in normal times in the steel sheet pile body, at least a portion of said opening is outside the installation range to the steel sheet pile body of the drainage member, the drainage member In addition, the drainage member is joined to the steel sheet pile main body by welding to compensate for the strength reduction due to the cross-sectional defect of the steel sheet pile main body due to the opening. Monodea Ru.

求項に係る液状化抑止機能を有する鋼矢板は、請求項に係る鋼矢板において、前記鋼矢板が左右非対称継手により同じ向きで接続可能なハット形鋼矢板またはSM−Jパイルであることを特徴とするものである。 Steel sheet pile having a liquefaction suppression function according to the Motomeko 6, in the steel sheet pile according to claim 5, wherein the steel sheet pile is hat-shaped steel sheet pile or SM-J pile can be connected in the same direction by asymmetrical joint It is characterized by this.

請求項に係る液状化抑止機能を有する鋼矢板は、請求項5または6に係る鋼矢板において、前記開口部の一部を前記排水部材の鋼矢板本体への設置範囲内に設けてあることを特徴とするものである。 It steel sheet pile having a liquefaction suppression function according to claim 7, in which the steel sheet pile according to claim 5 or 6, is provided with a portion of the opening in the installation range of the steel sheet pile body of the drainage member It is characterized by.

これは、開口部の少なくとも一部を排水部材の鋼矢板本体への設置位置に重ねて設けることにより、鋼矢板本体の開口部を通じて、排水部材取り付け側と反対側の地盤の間隙水を排出し液状化を抑止することを可能としたものである。   This is because at least a part of the opening is overlapped at the installation position of the drainage member on the steel sheet pile main body, so that the pore water in the ground opposite to the drainage member mounting side is discharged through the opening of the steel sheet pile main body. It is possible to prevent liquefaction.

請求項に係る液状化抑止機能を有する鋼矢板は、請求項5、6または7に係る鋼矢板において、前記開口部の面積の総和が、前記開口部に位置する鋼矢板の投影面積の0.1〜2%となるようにしたことを特徴とするものである。 A steel sheet pile having a liquefaction inhibiting function according to claim 8 is the steel sheet pile according to claim 5, 6 or 7 , wherein the total area of the openings is 0 of the projected area of the steel sheet pile located in the openings. Ru der which is characterized in that as a .1~2%.

求項5〜8に係る鋼矢板では、常時の透水性を備えつつ壁体両側の地盤の液状化を効率的に抑止することができることに加え、剛性の高い溝形状鋼材が排水部材として鋼矢板本体と一体化しているので、打設が容易であるとともに鋼矢板本体の開口による強度低下を補える効果を持つ。 steel sheet piles according to Motomeko 5-8, in addition to being able to prevent liquefaction of the wall on both sides of the ground efficiently while providing a constant water permeability, the steel as high groove shape steel drainage member rigidity since integrated with sheet pile body, two lifting the effect of compensate strength reduction due to the opening of the steel sheet pile body with a easy pouring.

常時には、壁体本体に通水用の開口部が形成されていることで、地下水の円滑な流れが阻害されることなく、従来、課題であった壁体背後における井戸枯れや水位低下の問題がない。 The flat at all times, that the opening for water flow to the wall body is formed, without smooth flow of ground water is inhibited, conventionally, wither wells in the wall behind it has been a problem and the drawdown there is no problem.

一方、地震時には、従来の液状化対策工と同様、壁体表面あるいは近傍の排水部材を通じて、過剰間隙水圧が逸散され、地盤の液状化が抑止される。そのため、単に地下水の流れが遮断され、水辺の自然環境が損なわれるのを防止するために矢板壁に開口部を設けた場合のように、開口部から土砂が流れ出て液状化対策の効果を低下させるといった恐れもない。   On the other hand, at the time of an earthquake, like the conventional liquefaction countermeasures, excessive pore water pressure is dissipated through the wall surface or the drainage member in the vicinity, and liquefaction of the ground is suppressed. Therefore, the flow of groundwater is simply cut off, and soil and sand flow out from the opening to reduce the effect of liquefaction countermeasures, as in the case where an opening is provided in the sheet pile wall to prevent damage to the natural environment of the waterside. There is no fear of letting it go.

本発明の液状化対策を施した壁体の概要と機能を説明するための鉛直断面図である。It is a vertical sectional view for explaining the outline and function of the wall body to which the liquefaction countermeasure of the present invention is applied. 施例1における鋼矢板の斜視図である。It is a perspective view of a steel sheet pile in the actual Example 1. 施例2における鋼矢板の斜視図である。It is a perspective view of a steel sheet pile in the real施例2. 施例3における鋼矢板を示したもので、(a)、(b)は互いに反対側から見た斜視図である。Shows a steel sheet pile in the real施例3 is a perspective view seen from (a), (b) the opposite sides. 施例3における鋼矢板の変形例を示したもので、(a)は開口部を排水部材を挟んで千鳥状配置にした場合の斜視図、(b)はさらに開口部を3連孔にした実施例の斜視図である。Shows a modification of the steel sheet pile in the real施例3, (a) is a perspective view of the case of the staggered across the drain member opening, (b) further openings in triplicate hole FIG. 矢板と排水部材の例を示したもので、(a)は水平断面図、(b)は立面図である。The example of a steel sheet pile and a drainage member is shown, (a) is a horizontal sectional view, (b) is an elevation view. 矢板と排水部材の例を示したもので、(a)は水平断面図、(b)は立面図、(c)は鋼矢板の斜視図、(d)、(e)は排水部材の断面図を示したものである。 It shows an example of a steel sheet pile and drainage member, (a) is a horizontal sectional view, (b) is an elevation view, (c) is a perspective view of a steel sheet pile, (d), (e) is a drainage member A cross-sectional view is shown. 比較例としての従来の液状化対策を施した壁体の概要と機能を説明するための鉛直断面図である。It is a vertical sectional view for explaining an outline and a function of a wall body to which a conventional liquefaction countermeasure is applied as a comparative example. ある一般的な地盤での壁体の開口率と壁設置前後の流量比の関係を求めたものであり、(a)は解析モデルの図、(b)は開口率と壁設置前後の流量比の関係を示すグラフである。The relationship between the wall opening ratio and the flow ratio before and after wall installation in a general ground was obtained. (A) is an analysis model, and (b) is the opening ratio and flow ratio before and after wall installation. It is a graph which shows the relationship.

以下、本発明と比較例の具体的な実施の形態について説明する。なお、本発明は、以下に説明する実施形態に限定されるものではない。 Hereinafter, specific embodiments of the present invention and comparative examples will be described. Note that the present invention is not limited to the embodiments described below.

図2は、実施例1における鋼矢板11の斜視図であり、実施例1では左右非対称継手により同じ向きで接続可能なハット形鋼矢板、あるいはSM−Jパイル(商品名)からなる鋼矢板11本体のウェブ11aとフランジ11bに囲まれた内側に、排水部材を構成する面状樹脂材13aを取り付けるとともに、鋼矢板11本体のウェブ11aに多数の透水孔12を穿設してある。 Figure 2 is a perspective view of a steel sheet pile 11 in the actual Example 1, steel sheet pile comprising a possible hat-shaped steel sheet pile connected in the same direction by the asymmetric joints in Example 1 or SM-J Pyle (trade name) The sheet resin 13a constituting the drainage member is attached to the inside surrounded by the 11 body web 11a and the flange 11b, and a large number of water permeable holes 12 are formed in the steel sheet pile 11 body web 11a.

このような鋼矢板11を左右両側の継手11c、11dを嵌合させながら地盤中に打設することにより、地盤中に液状化対策を施した鋼矢板壁が構築されることになる。   By placing such a steel sheet pile 11 in the ground while fitting the joints 11c and 11d on both the left and right sides, a steel sheet pile wall with a countermeasure against liquefaction in the ground is constructed.

面状樹脂材13aは、内部に通水用の空隙を有するものであり、必要に応じ外面にシート状のフィルターを取り付け、さらに必要に応じその外面に孔穿きプレート、溶接金網あるいはエキスパンドメタル、あるいは網状の樹脂材等からなる保護部材を取り付ける。   The planar resin material 13a has a water passage inside, and a sheet-like filter is attached to the outer surface as necessary, and a hole, a welded wire mesh or expanded metal, A protective member made of a net-like resin material or the like is attached.

図1は、本発明の液状化対策を施した壁体の概要と機能を説明するための鉛直断面図であり、鋼矢板11本体のウェブ11aに透水孔12を設けてあることで、平常時には、地下水の円滑な流れが阻害されることなく、従来、課題であった壁体背後における井戸枯れや水位低下の問題がない。   FIG. 1 is a vertical cross-sectional view for explaining the outline and function of a wall body to which liquefaction measures of the present invention are applied, and by providing a water permeable hole 12 in a web 11a of a steel sheet pile 11 body, The smooth flow of groundwater is not hindered, and there is no problem of well drainage and water level drop behind the wall, which has been a problem in the past.

一方、地震時には、排水部材3を通じて、過剰間隙水圧が逸散され、地盤の液状化が抑止される。 On the other hand, at the time of earthquake, the drain member 3 Through, excess pore water pressure is dissipated, ground liquefaction is suppressed.

図1に示される本発明の機能や原理は、後述する実施例2以下でも同様であるので、実施例2以下において繰返しの説明は省略する。   Since the functions and principles of the present invention shown in FIG. 1 are the same in the second embodiment and later, which will be described later, repeated description will be omitted in the second and subsequent embodiments.

なお、実施例1では、透水孔12を面状樹脂材13aの取付け位置にも設けてあるため、地震時の過剰間隙水圧をこの透水孔12を通じても逸散させることができる。   In the first embodiment, since the water permeable holes 12 are also provided at the mounting position of the planar resin material 13a, the excess pore water pressure during an earthquake can be dissipated through the water permeable holes 12 as well.

図3は、実施例2における鋼矢板の斜視図であり、実施例2においてもハット形鋼矢板からなる鋼矢板11本体のウェブ11aとフランジ11bに囲まれた内側に、排水部材を構成する面状樹脂材13aを取り付けるとともに、鋼矢板本体11のウェブ11aに多数の透水孔12を穿設してある。 Figure 3 is a perspective view of a steel sheet pile in the real施例2, inside surrounded by the web 11a and flange 11b of the steel sheet pile 11 body of hat-shaped steel sheet pile also in Example 2, constituting the drain member A sheet-like resin material 13 a is attached, and a large number of water-permeable holes 12 are formed in the web 11 a of the steel sheet pile main body 11.

必要に応じ外面にシート状のフィルターを取り付けたり、その外面に保護部材を取り付ける点は実施例2の場合と同様である。   The point which attaches a sheet-like filter to an outer surface as needed, or attaches a protection member to the outer surface is the same as that of the case of Example 2.

実施例2では、透水孔12を面状樹脂材13aの取付け位置には設けず、代わりに鋼矢板11本体のフランジ11b部分にも透水孔12を穿設している。   In Example 2, the water permeable hole 12 is not provided at the attachment position of the planar resin material 13a, but instead the water permeable hole 12 is also formed in the flange 11b portion of the steel sheet pile 11 main body.

図4は、実施例3における鋼矢板を示したもので、(a)、(b)は互いに反対側から見た斜視図である。 FIG. 4 shows a steel sheet pile in the real施例3 is a perspective view seen from (a), (b) the opposite sides.

実施例3における排水部材は、フィルター付き通水孔14を有する溝形状鋼材13bからなり、地震時には通水孔14から過剰間隙水が鋼矢板11本体と溝形状鋼材13bで囲まれた内部の中空空間に入り込み、過剰間隙水圧が逸散され、液状化が抑止される。   The drainage member in Example 3 is made of a groove-shaped steel material 13b having a water passage hole 14 with a filter, and in the event of an earthquake, an internal hollow space in which excess pore water is surrounded by the steel sheet pile 11 body and the groove-shaped steel material 13b. It enters the space, the excess pore water pressure is dissipated, and liquefaction is suppressed.

また、常時は、鋼矢板11本体のウェブ11a部分の幅方向両側に形成された透水孔12により地下水の流れが確保される。   Moreover, normally, the flow of groundwater is ensured by the water-permeable holes 12 formed on both sides in the width direction of the web 11a portion of the steel sheet pile 11 body.

図5(a)は、実施例3の鋼矢板の変形例であるが、排水部材を挟んで千鳥状になるように開口を設けたものである。このように、排水部材を挟んで千鳥状に開口すると鋼矢板本体の断面欠損が同じ高さに集中しないので好適である。また、開口した断面欠損部は、溝形状鋼材を鋼矢板本体に溶接等で接合してあると鋼矢板が補強されたことになり、この断面欠損による強度低下を補うことができる。   FIG. 5 (a) is a modified example of the steel sheet pile according to the third embodiment, in which openings are provided so as to be staggered with a drainage member interposed therebetween. Thus, if it opens like a zigzag shape on both sides of a drainage member, since the cross-sectional defect | deletion of a steel sheet pile main body does not concentrate on the same height, it is suitable. Moreover, if the groove-shaped steel material is joined to the steel sheet pile main body by welding or the like in the opened cross-sectional defect portion, the steel sheet pile is reinforced, and the strength reduction due to the cross-sectional defect can be compensated.

したがって、排水部材を鋼矢板本体に溶接などで一体化するとともに、開口部を排水部材取り付け区間内に設ければ、強度低下も最小限で液状化抑止もでき必要な透水性を確保できる合理的な、本発明の鋼矢板および壁体を提供できる。   Therefore, if the drainage member is integrated with the steel sheet pile body by welding, etc., and if the opening is provided in the drainage member mounting section, it is possible to suppress the liquefaction with minimum strength and ensure the necessary water permeability. Moreover, the steel sheet pile and wall of the present invention can be provided.

図5(b)は、他の変形例として、排水部材取付け区間の開口部を複数連ねた、例えば3連孔とした場合である。鋼矢板の種類、型式によっては、ウェブが狭く1孔で必要な面積を確保しようとすれば、長孔や矩形孔では孔長さが長くなり開口手間もコストもかかるので課題があるが、例えば開口が機械的に容易な円形孔を複数(この例では3つ)連ねて開口している。この方法により、1箇所の孔を実質大きくでき開口手間も軽減することができる。   FIG. 5B shows a case where a plurality of openings in the drainage member mounting section are connected, for example, three continuous holes, as another modification. Depending on the type and model of the steel sheet pile, there is a problem because if the web is narrow and one hole is required to secure the required area, the long hole and the rectangular hole will have a long hole length and will require both labor and cost. A plurality of (three in this example) circular holes that are mechanically easy to open are connected in series. By this method, one hole can be substantially enlarged, and the labor for opening can be reduced.

図4、図5において、鋼矢板本体はU形鋼矢板、ハット形鋼矢板などいずれの種類のものでもよい。   4 and 5, the steel sheet pile main body may be any type such as a U-shaped steel sheet pile and a hat-shaped steel sheet pile.

図6は、鋼矢板と排水部材の例を示したもので、(a)は水平断面図、(b)は立面図である。 FIG. 6 shows an example of a steel sheet pile and a drainage member, where (a) is a horizontal sectional view and (b) is an elevational view.

この例では、排水部材として、立体網状構造体の周囲にフィルターを被せるなどして、外周面にフィルター機能を有する樹脂製の立体網状構造体23aを、U形鋼矢板21本体のウェブ21aとフランジ21bに囲まれた内側に取り付けるとともに、U形鋼矢板21本体のウェブ21aに立体網状構造体23aの内部と連通する多数の透水孔22を穿設してある。   In this example, as a drainage member, a resin-made three-dimensional network structure 23a having a filter function on the outer peripheral surface, for example, a filter is placed around the three-dimensional network structure, and the web 21a and flange of the U-shaped steel sheet pile 21 main body. A large number of water permeable holes 22 communicating with the inside of the three-dimensional network structure 23a are formed in the web 21a of the U-shaped steel sheet pile 21 main body while being attached to the inside surrounded by 21b.

また、立体網状構造体23aは表面に、保護用金網23bを被せてある。また、この保護用金網は、多数の孔を有する保護プレートや筒状体等であってもよい。   The three-dimensional network structure 23a is covered with a protective metal mesh 23b. Further, the protective wire mesh may be a protective plate having a large number of holes, a cylindrical body, or the like.

図7は、鋼矢板と排水部材の他の例を示したもので、(a)は水平断面図、(b)は立面図、(c)は排水部材取り付け側からみた鋼矢板の斜視図、(d)は立体網状構造体25の断面図(網状構造体の網密度が外側で密;すなわち土砂浸入抑止機能を持てるよう密度を調整、内側で疎;すなわち内側は侵入水を抵抗少なく上方に逃がすため疎)、(e)は立体網状構造体の断面図(網状構造体の外側で土砂に排水部材内への侵入を抑止するフィルター機能を有し、内側に中空部を有する。)である。 FIG. 7 shows another example of the steel sheet pile and the drainage member. (A) is a horizontal sectional view, (b) is an elevation view, and (c) is a perspective view of the steel sheet pile as seen from the drainage member mounting side. , (D) is a cross-sectional view of the three-dimensional network structure 25 (the mesh density of the network structure is dense on the outside; that is, the density is adjusted so as to have a function of preventing intrusion of earth and sand; the inside is sparse; (E) is a cross-sectional view of a three-dimensional network structure (having a filter function to prevent the sand and sand from entering the drainage member on the outside of the network structure and having a hollow portion on the inside). is there.

この例では、排水部材として、表面側の網状構造を、周面にわたって、内側の網状構造より密にして周面にフィルター機能を持たせた樹脂製の立体網状構造体25を、ハット形鋼矢板24本体のウェブ24aとフランジ24bに囲まれた内側に取り付けるとともに、ハット形鋼矢板24本体のウェブ24aに立体網状構造体25の内部と連通する多数の透水孔(開口部)22を穿設してある。   In this example, as a drainage member, a three-dimensional network structure 25 made of a resin having a mesh structure on the surface side that is denser than the inner network structure on the peripheral surface and having a filter function on the peripheral surface is used as a hat-shaped steel sheet pile. 24 is attached to the inside surrounded by the web 24a of the main body and the flange 24b, and a plurality of water-permeable holes (openings) 22 communicating with the inside of the three-dimensional network structure 25 are formed in the web 24a of the hat-shaped steel sheet pile 24 main body. It is.

こうした構造では、フィルター機能をもつ排水部材外周囲の網状構造が鋼矢板製作加工時、運搬時、地盤への打設時に実用面から損傷をほとんどなくし得るので、取扱いに優れ、環境にも優しい液状化抑止機能を有する鋼矢板を提供できる。   In such a structure, the network structure around the drainage member that has a filter function can eliminate practically no damage during steel sheet pile manufacturing, transportation, and placement on the ground, so it is easy to handle and environmentally friendly. It is possible to provide a steel sheet pile having a function to suppress the crystallization.

このように、外周面側にフィルター機能を組み込んだ立体網状構造体25は、周囲が摩擦に強く地盤に打設しても液状化抑止機能を保持し実質損傷しないものであれば、表面に保護材料を被せる必要はない。   In this way, the three-dimensional network structure 25 incorporating the filter function on the outer peripheral surface side is protected on the surface as long as the surroundings are resistant to friction and retain the liquefaction suppression function and do not substantially damage even if placed on the ground. There is no need to cover the material.

ただし、この例の鋼矢板24を、固く尖った砕石混じり地盤などに打設する場合においては、この特別な網状構造の周囲、あるいは地盤面側などの一部を金網、孔開き板や孔開き筒状体で保護してもよいし、当該網状構造体25の周囲に網状構造体とは違う樹脂あるいは不織布などのフィルターを設け、その外側に上記のような保護材を設置してもよい。   However, in the case where the steel sheet pile 24 of this example is placed on the ground mixed with hard and sharp crushed stone, a part of the periphery of this special network structure or the ground surface side is made of a metal mesh, a perforated plate or a perforated plate. It may be protected by a cylindrical body, or a filter such as a resin or non-woven fabric that is different from the network structure may be provided around the network structure 25, and the protective material as described above may be installed outside the filter.

この例の排水部材25は、表面側の網状構造を、周面にわたって、内側の網状構造より密にして、排水部外周囲側フィルター機能を持たせたものであるが、地盤の土砂が排水部材内側に侵入することを抑止し、地盤の過剰間隙水圧を逸散させられるフィルター機能をもつ、内側に比べ密な網状層が外側にあればよく、このフィルター機能を持つ層の内側は外側の層より疎とし地中の間隙水の上部への移動抵抗を少なくしてあればよい。   The drainage member 25 in this example has a net-like structure on the surface side that is denser than the inner mesh-like structure over the peripheral surface, and has a drainage part outer periphery side filter function. It is only necessary to have a dense mesh layer on the outside, which has a filter function that prevents intrusion inside and dissipates excess pore water pressure of the ground, and the inside of this layer with this filter function is the outer layer What is necessary is just to make it less sparse and to reduce the resistance to movement of the pore water in the ground.

この密疎の順は、内側に行くにつれ、順次、疎になってもよく、中間部に密な層がありその内側が疎(例えば、最も外側は疎など)であってもよく、いずれの構造でもよい。要は、排水部材としての立体網状構造体において、その外側からの土砂浸入を抑止するため排水部材外側はより密にしてフィルター機能を持たせ、部材内部により疎な空間、すなわち水の移動抵抗の小さい空間を確保できればよい。   The order of this sparseness / sparseness may gradually become sparse as it goes inward, and there may be a dense layer in the middle and sparse inside (eg, sparse on the outermost side). It may be a structure. In short, in a three-dimensional network structure as a drainage member, in order to suppress the intrusion of earth and sand from the outside, the drainage member outer side is made denser to have a filter function, and the inside of the member has a sparse space, that is, the movement resistance of water. It is sufficient if a small space can be secured.

極端な場合は、図7(e)に示すように、当該排水部材25bの内部側が中空であってもよい。内部側が中空であれば、排水抵抗が小さくなるので、液状化抑止機能に優れる。この場合、耐圧性はやや落ちるが実用的にはほとんど差し支えない。   In an extreme case, as shown in FIG. 7 (e), the inner side of the drainage member 25b may be hollow. If the inner side is hollow, the drainage resistance is reduced, so that the liquefaction suppression function is excellent. In this case, the pressure resistance is slightly lowered, but practically no problem.

なお、液状化抑止機能を持つ排水部材がいずれの構造であっても、その排水部材の内部に中空部を有することは、液状化時、地盤上方への排水抵抗が少なく液状化抑止機能を上げることができるとともに、常時においても、被圧水層のある背面地盤あるいは前面地盤の場合など、水圧を速やかに逸散させ、常時においても鋼矢板壁への悪影響を常時緩和することができる。   In addition, regardless of the structure of the drainage member having a liquefaction suppression function, having a hollow part inside the drainage member increases the liquefaction suppression function when the liquefaction is less due to drainage resistance above the ground. In addition, it is possible to dissipate the water pressure promptly and always alleviate the adverse effects on the steel sheet pile wall even in the case of the back ground or the front ground with the pressurized water layer.

この例においては、排水部材25の鋼矢板本体への設置範囲に鋼矢板本体の開口部が設けられているので、排水部材25設置側地盤と反対方向の液状化も抑止できるのは図6の例と同じである。   In this example, since the opening of the steel sheet pile main body is provided in the installation range of the drainage member 25 to the steel sheet pile main body, the liquefaction in the direction opposite to the drainage member 25 installation side ground can also be suppressed as shown in FIG. Same as example.

また、常時においては、鋼矢板本体の開口部から排水部材を通して反対側地盤への地盤透水性を保持することができる。   Moreover, normally, the ground water permeability to the opposite ground can be maintained from the opening of the steel sheet pile main body through the drainage member.

図7(d)あるいは(e)に示す排水部材(立体網状構造体)の断面形状については、加工・運搬の点から、また地盤への打設性から外側が矩形状で高さがあまり高くないものがよい。図7(c)に示すように、排水部材の損傷防止、地盤への貫入性から、先端の加工を工夫するとともに、排水部材防護材を取り付けるなどの対策を施してもよい。   Regarding the cross-sectional shape of the drainage member (three-dimensional network structure) shown in Fig. 7 (d) or (e), the outer side is rectangular and the height is too high from the viewpoint of processing and transportation, and from the ease of placing on the ground. Nothing is good. As shown in FIG. 7 (c), in order to prevent damage to the drainage member and to penetrate into the ground, measures such as attaching the drainage member protective material may be taken while devising the processing of the tip.

なお、当該排水部材25を有する矢板は、その他にU形鋼矢板、Z形鋼矢板、直線形鋼矢板、軽量鋼矢板、コンクリート矢板など、特に限定されない。また、矢板本体に設ける開口部は、図7のように全数あるいは一部を排水部材取り付け範囲内に所定の面積比率で設けてもよく、逆に排水部材取り付け範囲外に所定の面積比率で設けてもよい。   In addition, the sheet pile having the drainage member 25 is not particularly limited, such as a U-shaped steel sheet pile, a Z-shaped steel sheet pile, a linear steel sheet pile, a lightweight steel sheet pile, and a concrete sheet pile. In addition, as shown in FIG. 7, all or a part of the openings provided in the sheet pile body may be provided in a predetermined area ratio within the drainage member attachment range, and conversely, provided in a predetermined area ratio outside the drainage member attachment range. May be.

地盤の液状化のない条件においても、背後地盤からの常時の水抜きが必要な鋼矢板擁壁において、この例のように、土砂の内側への侵入を防止するフィルター機能をもつ、矩形状の立体網状構造体を鋼矢板本体に接して背後地盤側に取り付け、その取り付け範囲内に鋼矢板本体の開口部を設けた場合には、当該開口部はフィルターを取り付けなくても開口部からの水抜きは図れ、開口部からの土砂の抜け出しを止めることができるとともに、投影面積の広い排水部材が背後地盤の集水を効率的に行うので、好適な鋼矢板擁壁を提供できる。   In the case of a steel sheet pile retaining wall that requires constant drainage from the ground even under conditions where the ground is not liquefied, a rectangular shape with a filter function that prevents intrusion of soil and sand, as in this example. When a three-dimensional network structure is attached to the back ground side in contact with the steel sheet pile main body, and the opening of the steel sheet pile main body is provided within the attachment range, the opening does not have a filter attached to the water from the opening. The drainage can be stopped, the escape of earth and sand from the opening can be stopped, and the drainage member having a large projected area efficiently collects water from the back ground, so that a suitable steel sheet pile retaining wall can be provided.

次に、開口部の面積について説明する。図8は、ある一般的な地盤において、壁体設置前後に流量比に対する壁体の開口率の影響を示したものである。   Next, the area of the opening will be described. FIG. 8 shows the influence of the opening ratio of the wall body on the flow rate ratio before and after installing the wall body in a certain general ground.

流量比には開口率だけでなく壁体(鋼矢板)の板厚も影響する。しかし、鋼矢板の板厚は通常50mm以内であり、常時の透水性に、通常、大きな支障が出ない範囲である、壁体を設けない場合の流量の7割以上の流量を確保するには、開口率が壁体の面積(投影面積)の0.1%以上あるのが好ましい。   Not only the aperture ratio but also the wall thickness (steel sheet pile) affects the flow rate ratio. However, the thickness of the steel sheet pile is usually 50 mm or less, and in order to ensure a flow rate of 70% or more of the flow rate when the wall body is not provided, which is a range in which a large hindrance is not normally caused in normal water permeability. The aperture ratio is preferably 0.1% or more of the wall area (projected area).

より好ましくは、流量比が0.85以上確保できるよう開口率は0.3%以上とするのがよい。開口率が2%で流量比は0.95以上となり、それ以上の開口率としても流量比の増加割合が少なく一定値に収束していく傾向があるので、2%以下とするのが好ましい。   More preferably, the aperture ratio should be 0.3% or more so that the flow rate ratio can be secured to 0.85 or more. When the aperture ratio is 2%, the flow rate ratio is 0.95 or more, and even when the aperture ratio is higher than that, the rate of increase in the flow rate ratio tends to be small and converge to a constant value.

本発明の液状化対策を施した壁体および液状化抑止機能を有する鋼矢板は、地震時に液状化が発生する恐れのある地盤において、盛土、堰堤、擁壁等の液状化対策工(耐震補強工)、あるいはアンダーパス、掘割道路、地中トンネル、沈砂池含む上下水道施設、水路、揚排水機場施設、洞道、地中埋設管などの地中構造物、および護岸、岸壁等に適用することができる。   The liquefaction-preventing wall body and steel sheet pile with liquefaction suppression function according to the present invention are used for liquefaction countermeasures such as embankments, dams, retaining walls, etc. on the ground where liquefaction may occur during an earthquake. ), Or underpass, digging roads, underground tunnels, water and sewage facilities including sand basins, waterways, pumping and drainage station facilities, tunnels, underground structures such as underground pipes, revetments, quay walls, etc. be able to.

1…壁体、2…鋼矢板、3…排水部材、4…液状化の恐れのある地盤、5…盛土、
11…鋼矢板、11a…ウェブ、11b…フランジ、11c、11d…継手、
12…透水孔(開口部)、13a…面状樹脂材、13b…溝形状鋼材、14…フィルター付き通水孔、
21…U形鋼矢板、21a…ウェブ、21b…フランジ、21c、21d…継手、
22…透水孔(開口部)、23a…立体網状構造体、23b…保護用金網、
24…ハット形鋼矢板、24a…ウェブ、24b…フランジ、25…本発明の
立体網状構造体、25a…本発明の立体網状構造体(立体網状構造の外側密(フィルター機能あり)、かつ内側密)、25b…本発明の立体網状構造体(立体網状構造の外側がフィルター機能持ち、かつ内側に中空部あり)、
31…壁体、32…鋼矢板、33…排水部材、34…透水性の高い地盤、35…盛土
DESCRIPTION OF SYMBOLS 1 ... Wall body, 2 ... Steel sheet pile, 3 ... Drainage member, 4 ... Ground in danger of liquefaction, 5 ... Embankment,
11 ... Steel sheet pile, 11a ... Web, 11b ... Flange, 11c, 11d ... Joint,
12 ... Water-permeable hole (opening), 13a ... Planar resin material, 13b ... Groove-shaped steel material, 14 ... Water passage hole with filter,
21 ... U-shaped steel sheet pile, 21a ... Web, 21b ... Flange, 21c, 21d ... Fitting,
22 ... Water-permeable holes (openings), 23a ... Three-dimensional network structure, 23b ... Protective wire mesh,
24 ... Hat-shaped steel sheet pile, 24a ... Web, 24b ... Flange, 25 ... Three-dimensional network structure of the present invention, 25a ... Three-dimensional network structure of the present invention (three-dimensional network structure outer dense (with filter function), inner dense ), 25b ... the three-dimensional network structure of the present invention (the three-dimensional network structure has a filter function on the outside and a hollow portion on the inside),
31 ... Wall body, 32 ... Steel sheet pile, 33 ... Drainage member, 34 ... Ground with high water permeability, 35 ... Embankment

Claims (8)

壁方向に連設した鋼矢板からなり、少なくとも片面に液状化抑止用の排水部材を取り付けた連続壁体において、前記排水部材は、鋼矢板本体に取り付けられた通水孔を有する溝形状鋼材からなり、前記鋼矢板本体に平常時における地下水の透水用の開口部を設けてあり、前記開口部の少なくとも一部は前記排水部材の鋼矢板本体への設置範囲外に、排水部材を挟んで千鳥状になるように設けるとともに、前記排水部材を鋼矢板本体に溶接で接合することで、前記開口部による鋼矢板本体の断面欠損による強度低下を補うようにしたことを特徴とする液状化対策を施した壁体。 In a continuous wall body comprising steel sheet piles arranged in a wall direction and having a liquefaction-suppressing drainage member attached to at least one surface, the drainage member is made of a groove-shaped steel material having water passage holes attached to the steel sheet pile body. The steel sheet pile main body is provided with an opening for water permeability of groundwater in normal times, and at least a part of the opening is staggered across the drainage member outside the installation range of the drainage member on the steel sheet pile main body. A liquefaction countermeasure characterized in that the drainage member is joined to the steel sheet pile main body by welding to compensate for strength reduction due to a cross-sectional defect of the steel sheet pile main body due to the opening. Wall body which we gave. 前記鋼矢板は左右非対称継手により同じ向きで接続可能なハット形鋼矢板またはSM−Jパイルであり、前記開口部をフランジまたはウェブに設けてあることを特徴とする請求項1記載の液状化対策を施した壁体。   2. The liquefaction countermeasure according to claim 1, wherein the steel sheet pile is a hat-shaped steel sheet pile or SM-J pile that can be connected in the same direction by a left-right asymmetric joint, and the opening is provided in a flange or a web. Wall body given. 前記開口部の一部を、前記排水部材の壁体本体への設置範囲内に設けることにより、前記排水部材からの前記開口部を通じての排水を可能としてあることを特徴とする請求項1または2記載の液状化対策を施した壁体。 A portion of the opening, by providing within the installation range of the wall body of the drainage member, according to claim 1 or 2, characterized in that you have allow drainage through the opening from the drainage member Wall body with the liquefaction countermeasures described. 前記開口部の面積の総和が、壁体投影面積の0.1〜2%となるようにしたことを特徴とする請求項1、2または3記載の液状化対策を施した壁体。 The wall body subjected to liquefaction countermeasures according to claim 1, 2 or 3, wherein the total area of the openings is 0.1 to 2% of the projected area of the wall body. 少なくとも片面に液状化抑止用の排水部材が取り付けられた鋼矢板において、前記排水部材は、鋼矢板本体に取り付けられた通水孔を有する溝形状鋼材からなり、前記鋼矢板本体に平常時における地下水の透水用の開口部を設けてあり、前記開口部の少なくとも一部は前記排水部材の鋼矢板本体への設置範囲外に、排水部材を挟んで千鳥状になるように設けるとともに、前記排水部材を鋼矢板本体に溶接で接合することで、前記開口部による鋼矢板本体の断面欠損による強度低下を補うようにしたことを特徴とする液状化抑止機能を有する鋼矢板。 In the steel sheet pile to which a drainage member for suppressing liquefaction is attached on at least one side, the drainage member is made of a groove-shaped steel material having a water passage hole attached to the steel sheet pile main body, and the steel sheet pile main body in normal groundwater And at least a part of the opening is provided outside the installation range of the drainage member on the steel sheet pile main body so as to have a staggered shape with the drainage member interposed therebetween, and the drainage member. A steel sheet pile having a liquefaction suppression function characterized in that, by joining the steel sheet pile body by welding, the strength reduction due to a cross-sectional defect of the steel sheet pile body due to the opening is compensated . 前記鋼矢板は左右非対称継手により同じ向きで接続可能なハット形鋼矢板またはSM−Jパイルであることを特徴とする請求項記載の液状化対策を施した鋼矢板。 6. The steel sheet pile with anti-liquefaction measures according to claim 5, wherein the steel sheet pile is a hat-shaped steel sheet pile or SM-J pile that can be connected in the same direction by a left-right asymmetric joint. 前記開口部の一部を、前記排水部材の鋼矢板本体への設置範囲内に設けてあることを特徴とする請求項5または6記載の液状化抑止機能を有する鋼矢板。 The steel sheet pile having a liquefaction inhibiting function according to claim 5 or 6 , wherein a part of the opening is provided within a range of installation of the drainage member on the steel sheet pile main body. 前記開口部の面積の総和が、前記開口部に位置する鋼矢板の投影面積の0.1〜2%となるようにしたことを特徴とする請求項5、6または7記載の液状化抑止機能を有する鋼矢板。 The liquefaction suppression function according to claim 5, 6 or 7 , wherein the total area of the openings is 0.1 to 2% of the projected area of the steel sheet pile located in the openings. Steel sheet pile with
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