JP3031336B2 - Sheet pile with drainage function, method of mounting filter for sheet pile, and drainage member - Google Patents

Sheet pile with drainage function, method of mounting filter for sheet pile, and drainage member

Info

Publication number
JP3031336B2
JP3031336B2 JP10195297A JP19529798A JP3031336B2 JP 3031336 B2 JP3031336 B2 JP 3031336B2 JP 10195297 A JP10195297 A JP 10195297A JP 19529798 A JP19529798 A JP 19529798A JP 3031336 B2 JP3031336 B2 JP 3031336B2
Authority
JP
Japan
Prior art keywords
sheet pile
drainage
filter
drainage member
ground
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.)
Expired - Fee Related
Application number
JP10195297A
Other languages
Japanese (ja)
Other versions
JPH1171750A (en
Inventor
幸生 才村
修 飯村
毅 飯田
浩 喜田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP10195297A priority Critical patent/JP3031336B2/en
Publication of JPH1171750A publication Critical patent/JPH1171750A/en
Application granted granted Critical
Publication of JP3031336B2 publication Critical patent/JP3031336B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本願発明は液状化のおそれの
ある地盤に構造物を構築する場合などに利用される排水
機能付矢板、そのフィルターの装着方法および排水用部
材に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet pile with a drainage function, which is used when constructing a structure on the ground where there is a possibility of liquefaction, a method of mounting a filter therefor, and a drainage member.

【0002】[0002]

【従来の技術】現用の液状化抑止手段としては、従来か
ら多用されている地盤締固め工法や、砕石ドレーン工法
(特開昭56−100919号公報、実開昭56−116434号公報参
照)があり、液状化の発生が予想される地盤に適用され
ている。さらに、地盤内の間隙水を集排水する目的や液
状化対策として、パイプ周面にフィルターを設けた耐圧
樹脂パイプは従来から用いられていた。また、近年、地
震時などにおける地盤内の過剰間隙水を排水する目的
で、鋼管などからなる杭に多数の孔を穿設し、孔部に土
砂の侵入を阻止する通水性のあるフィルターを設け、排
水効果に加え、杭の強度、剛性をも期待した中空孔あき
杭(特開昭61−146910公報参照)、多孔質コンクリート
パイル(特開昭61− 83711号公報参照)などが開発され
ている。
2. Description of the Related Art As liquefaction suppression means currently in use, there are a soil compaction method and a crushed stone drain method which have been frequently used (see JP-A-56-100919 and JP-A-56-116434). Yes, applied to the ground where liquefaction is expected. Furthermore, pressure-resistant resin pipes provided with a filter on the peripheral surface of the pipe have been conventionally used for the purpose of collecting and draining pore water in the ground and as a measure against liquefaction. In addition, in recent years, in order to drain excess pore water in the ground during an earthquake or the like, a large number of holes have been drilled in a pile made of steel pipe, etc., and a water-permeable filter has been installed in the hole to prevent intrusion of earth and sand. In addition, hollow holed piles (see JP-A-61-146910) and porous concrete piles (see JP-A-61-83711), which are expected to have the strength and rigidity of the pile in addition to the drainage effect, have been developed. I have.

【0003】一方、液状化抑止対策のために鋼矢板の構
造を工夫したものはほとんど発明、考案されておらず、
鋼矢板に排水用鉛直管を添設したもの(特開昭62−1463
15号公報参照)がみられるのみである。
[0003] On the other hand, there have been almost no inventions or ideas devised for the structure of steel sheet piles to prevent liquefaction.
Vertical sheet for drainage attached to steel sheet pile (Japanese Patent Laid-Open No. 62-1463)
No. 15).

【0004】[0004]

【発明が解決しようとする課題】地盤締固め工法は液状
化地盤が軟弱地盤と互層をなす場合に、コスト面で難が
あり、また砕石ドレーン工法は目詰まりなどにより、排
水効果が損なわれ、長期的な機能保持の保証がない。ま
た、特開昭61−146910号の中空孔あき杭や、特開昭61−
83711号の多孔質コンクリートパイルは、排水用の孔に
より構造体としての杭本体の耐荷力が低下することとな
る。耐圧樹脂パイプは強度、剛性が小さいため、地震な
どによる地盤の不可測の側方流動やすべりに抵抗するこ
とはほとんど期待できないし、またパイプの鉛直方向へ
の施工法については、パイプ周囲のフィルターの損傷を
防止するため、従来の砕石ドレーン工法で使われている
ものと同様なケーシングパイプを用いた方法によるな
ど、施工法が限定される。
The ground compaction method is difficult in terms of cost when the liquefied ground alternates with the soft ground, and the crushed stone drain method impairs the drainage effect due to clogging and the like. There is no guarantee of long-term function retention. Further, a hollow holed pile disclosed in JP-A-61-146910,
In the porous concrete pile of No. 83711, the load carrying capacity of the pile body as a structure is reduced due to the holes for drainage. Since pressure-resistant resin pipes have low strength and rigidity, they can hardly be expected to resist unpredictable lateral flow and slippage of the ground due to earthquakes, etc. In order to prevent damage to the construction, the construction method is limited, for example, by using a casing pipe similar to that used in the conventional crushed stone drain method.

【0005】また、特開昭62−146315号の鋼矢板に排水
用鉛直管を添設したものは、鉛直管の下端から上端へ向
け排水するのみであり、液状化地盤の厚さにわたる排水
機能は有しておらず、液状化対策としての効果には疑問
がある。
[0005] Further, in the steel sheet pile of JP-A-62-146315 in which a vertical pipe for drainage is attached, only drainage is performed from the lower end to the upper end of the vertical pipe, and the drainage function over the thickness of the liquefied ground is provided. Does not have this, and its effect as a liquefaction countermeasure is questionable.

【0006】本発明は上述のような従来技術における 長期的な液状化抑止機能 強度、剛性 液状化対策効果 などの各面における問題点を解決した排水機能付矢板を
提供することを目的としたものである。
SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet pile with a drainage function that solves the problems in various aspects such as the long-term liquefaction suppressing function, strength, rigidity and liquefaction countermeasure effect in the above-mentioned conventional technology. It is.

【0007】[0007]

【課題を解決するための手段】本願の請求項1に係る排
水機能付矢板は、矢板の所定区間に、排水用部材として
複数の鉛直方向のリブおよび多数の開口部を有するリブ
付き平板を、矢板本体の少なくとも片面に長手方向に沿
って設け、該リブ付き平板と前記矢板本体とで内側に中
空の排水空間を形成するとともに、該平板には前記開口
部から前記排水空間内への土砂の侵入を防ぐためのフィ
ルターを装着したことを特徴とするものである。
According to a first aspect of the present invention, there is provided a sheet pile with a drainage function, comprising a plurality of vertical ribs and a plurality of openings having a plurality of openings as drainage members in a predetermined section of the sheet pile. Provided along the longitudinal direction on at least one surface of the sheet pile main body, a hollow drainage space is formed inside by the ribbed flat plate and the sheet pile main body, and the flat plate is formed of soil and sand from the opening portion into the drainage space. A filter for preventing intrusion is provided.

【0008】排水用部材の材質は特に限定されず、鋼
材、アルミ材、合成樹脂など本願発明の矢板を地中に設
置する際に損傷により排水機能を失うことのないもので
あればよい。
The material of the drainage member is not particularly limited, and any material such as steel, aluminum, or synthetic resin may be used as long as it does not lose its drainage function due to damage when the sheet pile of the present invention is installed in the ground.

【0009】矢板本体は鋼製のものが一般的であるが、
矢板としての必要な強度を有するものであれば、他の金
属あるいはその他の材料からなるものでもよい。また、
矢板本体の元来の強度を低下させることのないよう、原
則として矢板本体には孔などを穿設していない。
The sheet pile body is generally made of steel.
Any other metal or other material may be used as long as it has the necessary strength as a sheet pile. Also,
In order not to lower the original strength of the sheet pile main body, in principle, no holes or the like are formed in the sheet pile main body.

【0010】フィルターの装着は排水用部材の排水路側
の少なくとも開口部より広い部分に接着剤を利用して、
または各種形状の整形補強材(後述する請求項5に対
応)を利用するなどして、容易に行うことができ、現場
で装着することもできる。
The filter is mounted by using an adhesive on at least a portion of the drainage member on the drainage channel side that is wider than the opening.
Alternatively, it can be easily performed by using a shaping reinforcing material of various shapes (corresponding to claim 5 described later), and can be mounted on site.

【0011】開口部の面積は排水用部材表面積に対して
所定の比率となっている。いうまでもなく、上記フィル
ターは排水用部材の開口部に取付けられるもので、取付
け方法はいかなる方法でもよく、本発明の矢板を地中に
設置する際に、フィルターが損傷しないようなものであ
ればよい。
The area of the opening has a predetermined ratio to the surface area of the drainage member. Needless to say, the filter is attached to the opening of the drainage member, and may be attached in any manner, as long as the filter is not damaged when the sheet pile of the present invention is installed in the ground. I just need.

【0012】なお、排水用部材として平板を用いた場
合、平板の剛性が小さければ、矢板の施工時や供用時に
地盤の水平圧力により、平板が水平方向にたわむおそれ
があるが、本願の請求項1に係る発明ではリブ付き平板
を用いており、リブの補剛効果によって水平方向のたわ
みを抑え、多数の部屋に仕切った形で排水空間を確保し
ている。
When a flat plate is used as a drainage member, if the rigidity of the flat plate is low, the flat plate may bend in the horizontal direction due to the horizontal pressure of the ground during the construction or operation of the sheet pile. In the invention according to the first aspect, a flat plate with a rib is used, the horizontal deflection is suppressed by the stiffening effect of the rib, and the drainage space is secured in a form partitioned into a number of rooms.

【0013】本願の請求項2に係る排水機能付矢板は、
矢板の所定区間に、排水用部材として複数の鉛直方向の
縦リブとこれに交差する横板状部材とをそれぞれ所定間
隔をおいて格子状に組合せて、多数の開口部を形成して
なる格子状排水用部材を、矢板本体の少なくとも片面に
長手方向に沿って設け、該格子状排水用部材と前記矢板
本体とで内側に中空の排水空間を形成するとともに、該
格子状排水用部材には前記開口部から前記排水空間内へ
の土砂の侵入を防ぐためのフィルターを装着したことを
特徴とするものである。
The sheet pile with drainage function according to claim 2 of the present application is:
A grid formed by combining a plurality of vertical ribs as drainage members and horizontal plate-shaped members intersecting the vertical ribs at predetermined intervals in a predetermined section of the sheet pile at predetermined intervals to form a large number of openings. The drainage member is provided on at least one surface of the sheet pile main body along the longitudinal direction, and a hollow drainage space is formed inside the lattice-shaped drainage member and the sheet pile body, and the lattice-shaped drainage member is A filter for preventing intrusion of earth and sand from the opening into the drainage space is provided.

【0014】機能的には請求項1に係る排水機能付矢板
と同様であるが、成形時に開口部を形成するための孔空
け加工などが不要となる。
Functionally, it is the same as the sheet pile with drainage function according to the first aspect, but it does not require a hole forming process for forming an opening at the time of molding.

【0015】請求項3は、請求項1または2に係る排水
機能付矢板について、排水用部材と矢板本体との接触面
の間に止水剤を介在させた場合である。
A third aspect of the present invention relates to the sheet pile with a drainage function according to the first or second aspect, wherein a water stopping agent is interposed between a contact surface between the drainage member and the sheet pile body.

【0016】排水用部材は必ずしも矢板本体の全長にわ
たって接合しなくてもよく、請求項3はそのような場合
において、隙間からの土砂の浸入を防ぐため、接触面に
止水剤を介在させるようにしたものである。
The drainage member does not necessarily have to be joined over the entire length of the sheet pile body. In such a case, a water blocking agent is interposed in the contact surface in order to prevent intrusion of earth and sand from a gap. It was made.

【0017】本願の請求項4に係る排水機能付矢板は、
矢板の所定区間に、排水用部材として1対の平板間に複
数の鉛直方向のリブを設けて、内側に複数の箱形の中空
の排水用空間を形成するとともに、前記平板の少なくと
も一つに多数の開口部を形成してなるリブ付き箱形構造
板を、矢板本体の少なくとも片面に長手方向に沿って設
け、該箱形構造板には前記開口部から前記排水空間内へ
の土砂の侵入を防ぐためのフィルターを装着したことを
特徴とするものである。
The sheet pile with drainage function according to claim 4 of the present application is:
In a predetermined section of the sheet pile, a plurality of vertical ribs are provided between a pair of flat plates as a drainage member to form a plurality of box-shaped hollow drainage spaces inside, and at least one of the flat plates A box-shaped structural plate with ribs formed with a large number of openings is provided on at least one surface of the sheet pile main body along the longitudinal direction, and intrusion of earth and sand into the drainage space from the opening into the box-shaped structural plate. It is characterized by having attached a filter for preventing.

【0018】請求項4に係る排水機能付矢板も、機能的
には請求項1、2のものと同様であるが、このような構
成とすることで、軽量でかつ剛性の高い排水機能付矢板
を得ることができる。
The sheet pile with drainage function according to the fourth aspect is functionally the same as that of the first and second aspects, but by adopting such a configuration, the sheet pile with the drainage function having light weight and high rigidity is obtained. Can be obtained.

【0019】請求項5は、請求項1、2、3または4記
載の排水機能付矢板について、フィルターの装着を、該
フィルターの形状を保持するための整形補強材を用いて
行っている場合である。
According to a fifth aspect of the present invention, in the sheet pile with drainage function according to the first, second, third or fourth aspect, the filter is mounted using a shaping reinforcing material for maintaining the shape of the filter. is there.

【0020】整形補強材を用いた場合、矢板本体および
排水用部材によって、あるいは排水用部材単独で形成さ
れる排水空間に、フィルターを取り付けた整形補強材を
長手方向から挿入することで、接着剤などを使用しなく
てもフィルターの装着を容易に行うことができる。
When a shaping reinforcing material is used, the shaping reinforcing material with a filter is inserted from the longitudinal direction into a drainage space formed by the sheet pile body and the draining member, or into a drainage space formed solely by the draining member. Mounting of the filter can be easily performed without using such a device.

【0021】請求項6に係る排水機能付矢板用フィルタ
ーの装着方法は、請求項5に係る排水機能付矢板へのフ
ィルターの装着を、矢板を地盤に打設した後、整形補強
材によって形状を保持したフィルターを現場で排水空間
内に挿入して行うことを特徴としたものである。
According to a sixth aspect of the present invention, in the method of mounting a filter for a sheet pile with a drainage function according to the fifth aspect, the filter is mounted on the sheet pile with a drainage function according to the fifth aspect, after the sheet pile is driven into the ground, and shaped by a shaping reinforcement. This is characterized in that the held filter is inserted into the drainage space on site to perform the operation.

【0022】請求項7に係る排水用部材は、本願の請求
項1に係る排水機能付矢板に使用することができる排水
用部材であって、長手方向に延びる複数のリブおよび前
記リブ間に多数の開口部を設けてなるリブ付き平板の、
少なくとも前記開口部位置に土砂の侵入を防ぐためのフ
ィルターを装着したことを特徴とするものである。
A drainage member according to a seventh aspect is a drainage member which can be used for the sheet pile with a drainage function according to the first aspect of the present invention, wherein a plurality of ribs extending in the longitudinal direction and a large number of ribs are provided between the ribs. Of a flat plate with ribs provided with an opening of
At least at the opening position, a filter for preventing intrusion of earth and sand is mounted.

【0023】請求項8に係る排水用部材は、本願の請求
項4に係る排水機能付矢板に使用することができる排水
用部材であって、1対の平板間に長手方向に延びる複数
のリブを設けて、内側に複数の箱形の中空の排水用空間
を形成するとともに、前記平板の少なくとも一つに多数
の開口部を形成するとともに、少なくとも前記開口部位
置に土砂の侵入を防ぐためのフィルターを装着したこと
を特徴とするものである。
The drainage member according to claim 8 is a drainage member that can be used for the sheet pile with drainage function according to claim 4 of the present application, and includes a plurality of ribs extending in a longitudinal direction between a pair of flat plates. To form a plurality of box-shaped hollow drainage space inside, and to form a large number of openings in at least one of the flat plate, and to prevent intrusion of earth and sand into at least the opening position It is characterized by attaching a filter.

【0024】土留め用などの目的で地盤に設置された矢
板については、地震時にその地盤が液状化すれば、地盤
は矢板の支持機能を失なう。地盤の特に液状化しやすい
箇所は地盤に異種の部材が入っている部分、すなわち矢
板近傍の地盤部分である。矢板の支持機能は矢板近傍の
地盤部分にほとんど依存している。
With respect to sheet piles installed on the ground for the purpose of earth retaining, etc., if the ground liquefies during an earthquake, the ground loses its support function. The portion of the ground that is particularly liable to be liquefied is a portion where different kinds of members are contained in the ground, that is, a ground portion near the sheet pile. The support function of the sheet pile depends mostly on the ground near the sheet pile.

【0025】したがって、矢板の地盤に接触している部
分に液状化対策を施せばよい。地盤の液状化は地盤を構
成する土砂粒子間に過剰間隙水圧が発生し、その土砂粒
子間の有効応力がなくなることによって起こる現象であ
り、この過剰間隙水圧を消散させれば液状化を抑止でき
る。過剰間隙水圧を消散させるためには、土砂粒子間の
間隙水を液状化のおそれのある地盤の外へ排出すればよ
い。
Therefore, a liquefaction countermeasure may be applied to the portion of the sheet pile that is in contact with the ground. Liquefaction of the ground is a phenomenon that occurs when excess pore water pressure is generated between the soil particles constituting the ground and the effective stress between the soil particles is lost, and liquefaction can be suppressed by dissipating this excess pore water pressure . In order to dissipate the excess pore water pressure, the pore water between the sediment particles may be discharged out of the ground where liquefaction may occur.

【0026】つまり、矢板の液状化地盤に接する部分に
排水機構を設ければ、矢板に対する地盤の支持機構は地
震時でも確保され、矢板自体の強度、剛性により地盤の
拘束効果も得られ、液状化対策としては極めて効果的で
ある。
In other words, if a drainage mechanism is provided at the portion of the sheet pile that is in contact with the liquefied ground, the ground support mechanism for the sheet pile can be ensured even during an earthquake, and the strength and rigidity of the sheet pile itself can provide the effect of restraining the ground. It is extremely effective as a countermeasure for the development

【0027】地震時の間隙水は排水用部材の開口部より
侵入し、排水用部材内の間隙、または矢板本体と排水用
部材間の間隙を通って排水され、矢板周辺地盤の液状化
が抑止される。このとき、土砂の侵入は開口部のフィル
ターにより阻止される。また、矢板本体については、強
度、剛性の低下がなく、地盤を拘束し、さらに地盤の側
方流動やすべりなどにも抵抗することができる。
[0027] The pore water during the earthquake enters through the opening of the drainage member and is drained through the gap in the drainage member or the gap between the sheet pile body and the drainage member, thereby suppressing liquefaction of the ground around the sheet pile. Is done. At this time, intrusion of earth and sand is prevented by the filter at the opening. Further, the sheet pile main body does not decrease in strength and rigidity, restrains the ground, and can further resist lateral flow, slip, and the like of the ground.

【0028】また、本願発明の排水機能付矢板を粘性土
質の地盤に用いた場合には、ドレーン材として機能し、
該地盤の圧密沈下を促し、地盤改良効果および矢板の地
盤支持機能を期待することができる。
Further, when the sheet pile with drainage function of the present invention is used for clayey soil, it functions as a drain material,
The consolidation settlement of the ground is promoted, and the ground improvement effect and the ground support function of the sheet pile can be expected.

【0029】[0029]

【発明の実施の形態】図1は、本願の請求項1に係るリ
ブ付き平板を用いた排水機能付矢板の一実施形態におけ
る水平断面を示したもので、この例では、矢板本体1の
凹部を利用して、リブ付き平板13aと矢板本体1との
間に中空の排水路5を形成している。
FIG. 1 shows a horizontal section of an embodiment of a sheet pile with a drainage function using a flat plate with ribs according to the first aspect of the present invention. In this example, a recess of a sheet pile body 1 is shown. The hollow drainage channel 5 is formed between the ribbed flat plate 13a and the sheet pile main body 1 by utilizing the above.

【0030】リブ付き平板13aは、平板に矢板の長手
方向に適当数、縦リブ15を設けたもので、矢板の施工
時や供用時の地盤の水平圧力に対する剛性が確保され、
水平方向のたわみを防止することができる。
The ribbed flat plate 13a is provided with an appropriate number of vertical ribs 15 in the lengthwise direction of the sheet pile, so that the rigidity against horizontal pressure of the ground at the time of sheet pile construction or operation is ensured.
Horizontal deflection can be prevented.

【0031】リブ付き平板13aの矢板本体1への取付
けは、平板13aが鋼製であれば、平板13aと矢板本
体1が接する部分を溶接などにより接合すればよく、平
板13aの縦リブ15と矢板本体1とが接する部分は、
上述のような接合手段によらず、ただ接触するだけの構
造にしておくことも可能である。
When the flat plate 13a is made of steel, the portion where the flat plate 13a and the sheet pile main body 1 are in contact with each other may be joined by welding or the like. The part that comes into contact with the sheet pile body 1
Instead of using the above-described joining means, it is also possible to adopt a structure that only makes contact.

【0032】リブ付き平板13aの平板部分には多数の
孔3が穿設されており、孔3は個々の孔の面積の和が孔
を穿けた部分の表面積の3〜5%程度以上となるように
設ければよい。排水路5の横断面の大きさは液状化地盤
の特性、排水抵抗などを考慮して決めればよい。
A large number of holes 3 are formed in the flat plate portion of the ribbed flat plate 13a, and the sum of the areas of the holes 3 is about 3 to 5% or more of the surface area of the holed portion. What is necessary is just to provide. The size of the cross section of the drainage channel 5 may be determined in consideration of the characteristics of the liquefied ground, drainage resistance, and the like.

【0033】また、リブ付き平板13aと矢板本体1で
形成される排水路5頂部は、例えば金属製や合成樹脂製
のネットとフィルターを重ね合せたり、ネットやフィル
ターを単独で用いたりして、土砂などの排水路5への侵
入を防ぐ構造とする。また、排水路5頂部に管を連結さ
せて、矢板から離れて間隙水を排出することもできる。
The top of the drainage channel 5 formed by the ribbed flat plate 13a and the sheet pile body 1 is formed by, for example, laminating a metal or synthetic resin net with a filter, or using the net or filter alone. The structure is such that earth and sand are prevented from entering the drainage channel 5. Further, a pipe can be connected to the top of the drainage channel 5 to discharge pore water away from the sheet pile.

【0034】土砂流入防止用のフィルター4としては、
ステンレス製のフィルターを用いてもよく、合成繊維製
のものや合成樹脂製のものを用いてもよい。発錆の懸念
があるときは、後者のフィルターの方が好ましく、例え
ばナイロン製、ポリエチレンモノフィラメント製、ポリ
エステル製などの経編布や、ポリプロピレン製、ポリエ
ステル繊維製などの不織布などを用いることができる。
As the filter 4 for preventing inflow of sediment,
A stainless steel filter may be used, or a synthetic fiber filter or a synthetic resin filter may be used. When there is a concern about rusting, the latter filter is preferable, and for example, a warp knitted fabric made of nylon, polyethylene monofilament, polyester, or the like, or a nonwoven fabric made of polypropylene, polyester fiber, or the like can be used.

【0035】また、合成繊維どうし、合成樹脂どうし、
あるいは合成繊維と合成樹脂を組み合わせたり、重ね合
せたりして、フィルターとしてもよい。例えば、薄い経
編布や不織布からなる合成繊維製のフィルターの片面ま
たは両面に、この合成繊維製フィルターより厚く、メッ
シュの大きい合成樹脂製のフィルター、または合成繊維
製フィルターより厚く、そのメッシュより大きい小孔を
多数有する合成樹脂製のネットを重ね合せて補強したフ
ィルターを用いることもできる。
Further, synthetic fibers, synthetic resins,
Alternatively, a filter may be formed by combining or overlapping synthetic fibers and a synthetic resin. For example, on one or both sides of a synthetic fiber filter made of a thin warp knitted cloth or nonwoven fabric, a synthetic resin filter thicker than this synthetic fiber filter, a mesh larger, or thicker than a synthetic fiber filter, larger than the mesh A filter reinforced by laminating synthetic resin nets having many small holes can also be used.

【0036】フィルター4としての経編布や不織布、ま
たはステンレス製フィルターなどのメッシュ間隔または
間隙は、液状化防止などの対象とする地盤(一般には砂
地盤)の土の粒径分布を勘案して、土砂によるフィルタ
ー4の目詰まりを起こさないように設定するのがよい。
The mesh spacing or gap of the warp knitted fabric, nonwoven fabric, stainless steel filter or the like as the filter 4 is determined in consideration of the particle size distribution of the soil (generally sand ground) to be subjected to liquefaction prevention or the like. It is preferable to set the filter 4 so as not to cause the filter 4 to be clogged with earth and sand.

【0037】このメッシュ間隔または間隙は、液状化の
可能性のある地盤で、土の粒径が特別大きく、比較的均
一に分布している地盤では1〜3mm程度に大きく設定す
ることも可能であるが、こうした地盤は少なく、液状化
の可能性のある一般的な地盤では1〜3mm程度よりかな
り小さく設定するのがよい。
The mesh spacing or gap can be set as large as about 1 to 3 mm in the ground where liquefaction is likely, and in the ground where the grain size of the soil is particularly large and relatively uniformly distributed. However, there are few such grounds, and it is better to set the ground to be considerably smaller than about 1 to 3 mm in general ground which may be liquefied.

【0038】液状化対策におけるフィルター4の透水係
数は、液状化対策杭1などの設置地盤にもよるが、一般
に10-2cm/sec 〜10-1/sec 程度以上のものが好ま
しい。
The permeability of the filter 4 in the liquefaction countermeasure depends on the installation ground of the liquefaction countermeasure pile 1 and the like, but is generally preferably about 10 -2 cm / sec to 10 -1 / sec or more.

【0039】フィルター4は孔3部分のみに装着しても
よいが、孔が多数穿設されている場合には、排水用部材
の内側(排水路5側)穿孔部分に全面的に装着する方が
合理的である。
The filter 4 may be mounted only on the hole 3 portion. However, if a large number of holes are formed, the filter 4 should be entirely mounted on the inside of the drainage member (drainage channel 5 side). Is reasonable.

【0040】フィルター4は排水用部材の内側に合成樹
脂系接着剤などで貼付してもよい。また、フィルター4
は排水用部材の形状に合うよう整形すれば必ずしも排水
用部材の内側に合成樹脂系接着剤などで貼付しなくても
よい。
The filter 4 may be attached to the inside of the drainage member with a synthetic resin adhesive or the like. Filter 4
It is not always necessary to attach the inside of the drainage member with a synthetic resin adhesive or the like as long as it is shaped to match the shape of the drainage member.

【0041】ただし、後者の場合、フィルター4の整形
には何らかの整形補強材を用いるのがよい。整形補強材
としては合成樹脂製のネットや金網などを用いることが
できる。すなわち、合成樹脂製のネットや金網などを排
水用部材の形状に合うよう整形しておいてそれを骨組と
して合成繊維製のフィルター4をネットや金網に装着し
てフィルターを整形することができる。
However, in the latter case, it is preferable to use some kind of shaping reinforcing material for shaping the filter 4. As the shaping reinforcing material, a net or a wire net made of a synthetic resin can be used. That is, it is possible to shape a synthetic resin net or wire mesh so as to conform to the shape of the drainage member, use the frame as a framework, and attach the synthetic fiber filter 4 to the net or wire mesh to shape the filter.

【0042】以上の整形されたフィルターは必ずしも全
長にわたって排水用部材内面に貼付する必要はなく、本
発明の液状化抑止矢板の供用時に、排水用部材の穿孔部
の内面にほぼ密着していて、また矢板の運搬、施工時に
おいても排水用部材の穿孔部からずれないようにする必
要がある。
The above-shaped filter does not necessarily need to be stuck to the inner surface of the drainage member over its entire length. When the liquefaction-preventing sheet pile of the present invention is put into service, the filter is almost in close contact with the inner surface of the perforated portion of the drainage member. In addition, it is necessary to prevent the sheet from being displaced from the perforated portion of the drainage member even during transportation and construction of the sheet pile.

【0043】したがって、整形されたフィルターを排水
用部材に貼付によって固定しない場合には、排水用部材
内に留め金具などによりフィルター整形補強材の上下端
などを固定して矢板の運搬時、施工時などにフィルター
がずれないようにすればよい。
Therefore, when the shaped filter is not fixed to the drainage member by sticking, the upper and lower ends of the filter shaping reinforcing material are fixed in the drainage member by fasteners or the like to transport the sheet pile or to perform the construction. What is necessary is just to make sure that the filter does not shift.

【0044】排水用部材としてのリブ付き平板13aの
材質は、鋼のみならずポリエチレン系、ポリエステル系
(FRPなど)、塩化ビニール系、エポキシ樹脂系、ポ
リプロピレン系、ナイロン系などの合成樹脂、ステンレ
ス、アルミなどいずれでもよい。
The material of the flat plate with ribs 13a as a drainage member is not only steel but also synthetic resins such as polyethylene, polyester (FRP, etc.), vinyl chloride, epoxy resin, polypropylene, nylon, stainless steel, and the like. Any such as aluminum may be used.

【0045】リブ付き平板13aの矢板本体1への取付
けは、溶接接合、接着剤による接着接合、ろう付け、留
め金具などを利用した機械的接合などによることができ
る。排水用部材は矢板本体と全長にわたって接合されて
いる必要はなく、矢板の地盤への打設時にリブ付き平板
13aが矢板本体1から離脱しないよう接合されていれ
ばよい。
The attachment of the ribbed flat plate 13a to the sheet pile main body 1 can be performed by welding, adhesive bonding with an adhesive, brazing, mechanical bonding using fasteners, or the like. The drainage member does not need to be joined to the sheet pile main body over the entire length, and may be joined so that the ribbed flat plate 13a does not separate from the sheet pile main body 1 when the sheet pile is driven into the ground.

【0046】この場合、リブ付き平板13aの両側端と
矢板本体1の接触面には両者の不整から隙間ができ易
い。この隙間ができると、ここから排水路5内に地盤の
土砂が流入して排水路をふさぐ懸念が生じる。また、地
盤の液状化時、地盤の間隙水が排水用部材内の排水路を
通じて排出されるとき、間隙水の一部がこの間隙から流
出し、排出水流に乱れが生じ、排水抵抗が大きくなる懸
念もある。
In this case, a gap is likely to be formed between both ends of the ribbed flat plate 13a and the contact surface of the sheet pile body 1 due to irregularities between the two. When this gap is formed, there is a concern that earth and sand from the ground may flow into the drainage channel 5 from here and block the drainage channel. Also, when the ground is liquefied, when the interstitial water of the ground is discharged through the drainage channel in the drainage member, part of the interstitial water flows out of the gap, the turbulence occurs in the discharged water flow, and the drainage resistance increases. There are also concerns.

【0047】このような間隙を防ぐため、溝形鋼2と鋼
矢板本体1の接触面に合成樹脂またはスチレンブタジエ
ンゴムまたはアスファルトを主成分とする止水剤を塗布
すれば、簡易に排水機構として十分な水密性を保つこと
ができる(請求項3に対応)。
In order to prevent such a gap, if a waterproofing agent containing synthetic resin or styrene-butadiene rubber or asphalt as a main component is applied to the contact surface between the channel steel 2 and the sheet pile main body 1, a drainage mechanism can be easily formed. Sufficient watertightness can be maintained (corresponding to claim 3).

【0048】止水剤のうち、より高い水密性が得られる
のは吸水膨潤性の止水剤である。この種の止水剤は、特
殊ウレタンなどの合成樹脂を主成分とするもので、止水
剤を所定の部分に、スプレー、または刷毛で塗布するだ
けでよい。塗膜は、淡水や海水に浸漬することにより膨
潤し、厚みが8倍〜10倍程度に増加する性質がある。
液状化の可能性のある地盤には、必ず水が存在するの
で、この吸水膨潤性が効果を発揮することとなる。
Among the water-stopping agents, the one having higher watertightness is a water-absorbing and swelling water-stopping agent. This type of water-stopping agent is mainly composed of a synthetic resin such as special urethane, and it is only necessary to apply the water-stopping agent to a predetermined portion by spraying or brushing. The coating film swells when immersed in fresh water or seawater, and has a property of increasing the thickness by about 8 to 10 times.
Since there is always water in the ground that may be liquefied, this water absorption and swelling property is effective.

【0049】また、止水剤としては粘弾性的に固結し
た、上記と同様の材質の、吸水膨潤性をもつ、平板状と
した止水剤を排水用部材と矢板本体の接触面間に用いる
ことができる。この場合においても、上述の場合と同様
の止水効果が得られる。止水剤としては、スチレンブタ
ジエンゴムやアスファルトを主成分とするものでも、排
水用部材と鋼矢板の接触面の水密性が得られる。この種
の止水剤も所定の部分に塗布し、その後、排水用部材を
圧接して矢板本体に取付ければよい。また、粘弾性的に
固結した平板を排水用部材と矢板本体の接触面間に用
い、その後、排水用部材を圧接して矢板本体に取り付け
てもよい。
As the water-stopping agent, a viscoelastically solidified, water-absorbing and swellable, plate-shaped water-stopping agent made of the same material as described above is provided between the draining member and the contact surface of the sheet pile body. Can be used. In this case, the same water stopping effect as in the above case can be obtained. Even if the waterstopping agent is mainly composed of styrene-butadiene rubber or asphalt, the watertightness of the contact surface between the drainage member and the steel sheet pile can be obtained. This type of waterproofing agent may also be applied to a predetermined portion, and then the drainage member may be pressed against and attached to the sheet pile body. Alternatively, a viscoelastically consolidated flat plate may be used between the contact surface of the drainage member and the sheet pile body, and then the drainage member may be pressed against and attached to the sheet pile body.

【0050】上記の平板の材質は、ゴムやアスファルト
などを主成分とする粘弾性を有するものが望ましいが、
これと同様に水密性が得られるものならいずれの止水剤
を用いてもよい。
The material of the above-mentioned flat plate is desirably a material having viscoelasticity mainly composed of rubber, asphalt and the like.
Similarly, any water-stopping agent may be used as long as watertightness can be obtained.

【0051】図2は縦リブ15の付いた平板13aを取
付けた構造の他の実施形態を示したもので、矢板本体1
の反対側の面にも両端に縦リブ15を有する同様な平板
13bを取付けて排水路5aを確保したものである。
FIG. 2 shows another embodiment in which a flat plate 13a having a vertical rib 15 is attached.
A drainage channel 5a is secured by attaching a similar flat plate 13b having vertical ribs 15 at both ends to the opposite surface.

【0052】次に、上述した図1および図2の実施形態
に比べ、より細かに多数の縦リブを矢板の長手方向にも
つ平板、または平板間に多数の縦リブをもつ箱形構造板
を排水用部材として矢板本体の片面または両面に取付け
た例を示す。
Next, as compared with the embodiment shown in FIGS. 1 and 2 described above, a flat plate having many vertical ribs in the longitudinal direction of the sheet pile or a box-shaped structural plate having many vertical ribs between the flat plates is used. An example in which the sheet pile is attached to one or both sides of a sheet pile main body as a drainage member is shown.

【0053】図3に多数の縦リブ17をもつリブ付き平
板16の例を示す。孔3は縦リブ17間に設けられてい
る。個々の孔3の面積の和は孔の穿けられた平板部分の
面積の3〜5%程度以上となつている。小さい孔が多数
一様に分布するよう穿けられているのが望ましい。
FIG. 3 shows an example of a flat plate 16 with ribs having a number of vertical ribs 17. The holes 3 are provided between the vertical ribs 17. The sum of the areas of the individual holes 3 is about 3 to 5% or more of the area of the flat plate portion having the holes. Desirably, many small holes are drilled so as to be evenly distributed.

【0054】図4には2枚以上の平板間に多数の縦リブ
19をもつ箱形構造板18の例を示す(請求項4に対
応)。孔3は縦リブ19間において、いずれか一方の平
板に設けられている。または、両側の平板とも孔3が穿
けられた構造であってもさしつかえない。同様に個々の
孔の面積の和は、孔の穿けられた平板部分の面積の和が
3〜5%程度以上となっており、比較的小さい孔が多数
一様に分布するよう穿けられているのが望ましい。
FIG. 4 shows an example of a box-shaped structural plate 18 having a number of vertical ribs 19 between two or more flat plates (corresponding to claim 4). The hole 3 is provided in one of the flat plates between the vertical ribs 19. Alternatively, both flat plates may have a structure in which the hole 3 is formed. Similarly, the sum of the areas of the individual holes is such that the sum of the areas of the flat portions where the holes are formed is about 3 to 5% or more, and a relatively large number of relatively small holes are drilled so as to be uniformly distributed. Is desirable.

【0055】上述の図3、図4に示したように、排水用
部材に多数の縦リブを設けた場合、軽量にして剛性のよ
り高い排水用部材が得られる。剛性の高い部材であれば
これを矢板本体に一体的に取付けたとき、この矢板を地
盤に設置した後、地盤の水平圧力を受けても排水用部材
の水平たわみが抑えられる。このことにより、上述の排
水用部材を矢板本体に取付けると、施工時でも排水路が
地盤圧力により押しつぶされることもなく、矢板の供用
時でも排水路を確保しながら地盤反力を確実にとれるの
で、強固な壁体を築造できる。
As shown in FIGS. 3 and 4, when a large number of vertical ribs are provided on the drainage member, a lightweight and highly rigid drainage member can be obtained. When a rigid member is integrally attached to the sheet pile main body, the horizontal deflection of the drainage member can be suppressed even when the sheet pile is installed on the ground and then subjected to the horizontal pressure of the ground. Thus, when the above-described drainage member is attached to the sheet pile body, the drainage channel is not crushed by the ground pressure even during construction, and the ground reaction force can be reliably obtained while securing the drainage channel even when the sheet pile is in service. You can build a strong wall.

【0056】排水用部材の材質は特に限定されず、ポリ
エチレン系、ポリエステル系、塩化ビニール系、エポキ
シ樹脂系、ポリプロピレン系、ナイロン系などの合成樹
脂、繊維強化合成樹脂(FRP)、鋼、ステンレス、ア
ルミなどいずれでもよい。
The material of the drainage member is not particularly limited, and synthetic resins such as polyethylene, polyester, vinyl chloride, epoxy resin, polypropylene, and nylon, fiber-reinforced synthetic resin (FRP), steel, stainless steel, Any such as aluminum may be used.

【0057】排水用部材の製造方法としては、図3、図
4に示す形態にするにはポリエチレン、ポリエステル、
塩化ビニール、ポリプロピレン、ナイロン、エチレン−
酢酸ビニル共重合体などの熱可塑性合成樹脂を連続的に
押出し成形することによって可能である。押出し成形
後、合成樹脂の比較的柔らかいときに、尖端状の鋼棒を
多数有する治具などを圧接することなどにより容易に穿
孔できる。また、硬くなったときでもドリル、せん断加
工機などで容易に穿孔できる。
As a method for producing the drainage member, polyethylene, polyester,
Vinyl chloride, polypropylene, nylon, ethylene
This is possible by continuously extruding a thermoplastic synthetic resin such as a vinyl acetate copolymer. After the extrusion molding, when the synthetic resin is relatively soft, it can be easily perforated by pressing a jig having a number of pointed steel bars or the like. Further, even when it becomes hard, it can be easily drilled with a drill, a shearing machine or the like.

【0058】また、排水用部材が前述の熱可塑性樹脂の
場合には、図7に示すように縦リブ21と横板状部材2
2をそれぞれ間隔をあけて格子状に組合せ、互いの交点
を熱溶着、樹脂系溶接、または接着接合することにより
多数の孔3b(間隙)のある格子状排水用部材20を製
造することができる。
When the drainage member is made of the above-mentioned thermoplastic resin, as shown in FIG.
2 are arranged in a grid at intervals, and the intersections of the grids are heat-welded, resin-based, or bonded to form a grid-shaped drainage member 20 having a large number of holes 3b (gap). .

【0059】さらに、この格子状排水用部材20が鋼、
ステンレスなどの場合には、該交点を溶接接合して図7
に示す構造を得ることができる。さらに、排水用部材が
アルミなどの場合には、該交点を溶接接合またはろう付
けによって図7に示す構造を得ることができる。
Further, the grid-like drainage member 20 is made of steel,
In the case of stainless steel or the like, the intersection is welded and joined as shown in FIG.
Can be obtained. Further, when the drainage member is aluminum or the like, the structure shown in FIG. 7 can be obtained by welding or brazing the intersection.

【0060】図3、図4に示したリブ付き平板16また
は箱形構造板18を矢板本体1の片面(凹部)に取付け
た例を図5および図6に示す。図7に示した格子状排水
用部材20も図5、図6と同様に取付けることができ
る。図5では、排水用部材を矢板本体1のフランジ部ま
で取付けているが、矢板本体1中央部のウェブ部のみで
もよい。
FIGS. 5 and 6 show an example in which the flat plate 16 with ribs or the box-shaped structure plate 18 shown in FIGS. 3 and 4 is attached to one surface (recess) of the sheet pile main body 1. The drainage member 20 shown in FIG. 7 can be attached similarly to FIGS. In FIG. 5, the drainage member is attached up to the flange portion of the sheet pile main body 1, but it may be only the web portion at the center of the sheet pile main body 1.

【0061】また、これらの排水用部材は図8に示すよ
うに、矢板本体1の凸面に取付けてもよいし、図9に示
すように矢板本体1の両面に取付けてもよい。
These drainage members may be mounted on the convex surface of the sheet pile main body 1 as shown in FIG. 8, or may be mounted on both sides of the sheet pile main body 1 as shown in FIG.

【0062】排水用部材の先端には図5に示すように、
特に矢板の施工時に排水用部材が矢板本体1から離脱し
ないよう先端をくさび状とする先端保護プレート14を
設ける。さらに、排水用部材の上端は排水路に土砂など
が侵入しないように、ネットまたはフィルター、あるい
はフィルターとネットを重ね合わせたもの設ければよ
い。
At the tip of the drainage member, as shown in FIG.
In particular, a tip protection plate 14 having a wedge-shaped tip is provided so that the drainage member does not detach from the sheet pile main body 1 when the sheet pile is constructed. Further, the upper end of the drainage member may be provided with a net, a filter, or a combination of a filter and a net so that soil and the like do not enter the drainage channel.

【0063】また、排水用部材に設けた多数の孔3から
土砂が侵入しないよう排水用部材の排水路側には、図1
0に示すようにフィルター4を貼付すればよい。この場
合、フィルター4は排水用部材としてのリブ付き平板1
6にあらかじめ樹脂系接着剤などで貼付しておき、この
リブ付き平板16を矢板本体1に取付けることができ
る。
Further, in order to prevent earth and sand from entering through a large number of holes 3 provided in the drainage member, the drainage member side of the drainage member is provided with a structure shown in FIG.
The filter 4 may be attached as shown in FIG. In this case, the filter 4 is a flat plate with ribs 1 as a drainage member.
6, the ribbed flat plate 16 can be attached to the sheet pile main body 1 in advance with a resin adhesive or the like.

【0064】また、フィルター4の別の装着方法として
は、排水路空間に適合するような形状にした整形補強材
8aを製作し、整形補強材8aの少なくともリブ付き平
板16の孔3の設けられた側にフィルター4を取付けて
おく。整形補強材8aは金網や合成樹脂製のネツトなど
で作ることができる。
As another mounting method of the filter 4, a shaping reinforcing member 8 a having a shape adapted to the drainage space is manufactured, and at least the hole 3 of the ribbed flat plate 16 of the shaping reinforcing member 8 a is provided. The filter 4 is attached to the side. The shaping reinforcing member 8a can be made of a wire net or a net made of a synthetic resin.

【0065】図11に整形補強材8aとフィルター4の
装着例を示す。この例ではフィルター4を整形補強材8
aの周囲に装着している。もちろん少なくとも、排水用
部材の孔部に相当する、整形補強材の面以上にフィルタ
ーが装着されていればよい。
FIG. 11 shows an example of mounting the shaping reinforcing material 8a and the filter 4. In this example, the filter 4 is made of a shaping reinforcing material 8.
a. Of course, it is only necessary that the filter is attached to at least the surface of the orthopedic reinforcing material corresponding to the hole of the drainage member.

【0066】整形補強材8aを用いてフィルター4を装
着した例を図12、図13に示す。この場合、排水用部
材を矢板本体1に取付けた後、フィルター4を装着した
整形補強材8aを、排水用部材と矢板本体1で囲まれる
空間に挿入してもよい。また、排水用部材としてのリブ
付き平板16または箱形構造板18の縦リブ間にフィル
ター4を装着した整形補強材8aを取付けておき、この
処置をした排水用部材を矢板本体1に取付けてもよい。
FIGS. 12 and 13 show an example in which the filter 4 is mounted using the shaping reinforcing material 8a. In this case, after attaching the drainage member to the sheet pile body 1, the shaping reinforcing material 8 a to which the filter 4 is attached may be inserted into a space surrounded by the drainage member and the sheet pile body 1. In addition, a shaping reinforcing material 8a having a filter 4 attached thereto is attached between the ribs of the flat plate 16 with ribs or the box-shaped structural plate 18 as a drainage member, and the drainage member thus treated is attached to the sheet pile body 1. Is also good.

【0067】排水用部材の矢板本体への取付方法として
は例えば以下の方法を採用することができる。 (1) 排水用部材が例えばポリエチレン樹脂からなる場合
は、排水用部材を取付けようとする鋼矢板本体の少なく
とも片面の、排水用部材と鋼矢板本体の接触する適当な
部分にプライマー処理し、鋼矢板本体を予熱する。予熱
された鋼矢板本体に、予熱された排水用部材を鋼矢板本
体と排水用部材の間に接着剤を用いて圧接すれば鋼矢板
本体と排水用部材は強固に一体となる。
As a method of attaching the drainage member to the sheet pile body, for example, the following method can be adopted. (1) When the drainage member is made of, for example, polyethylene resin, at least one side of the steel sheet pile main body to which the drainage member is to be attached, a suitable portion of the steel sheet pile body that comes into contact with the drainage member is subjected to a primer treatment, Preheat the sheet pile body. If the preheated drainage member is pressed against the preheated steel sheet pile main body using an adhesive between the steel sheet pile main body and the drainage member, the steel sheet pile main body and the drainage member are firmly integrated.

【0068】(2) 排水用部材が例えば鋼、ステンレス、
アルミからなる場合は排水用部材を取付けようとする鋼
矢板本体の少なくとも片面の、排水用部材と鋼矢板本体
の接触する適当な部分に溶接またはろう付けを施して接
合させ、鋼矢板本体と排水用部材を強固に一体化するこ
とができる。
(2) The drainage member is, for example, steel, stainless steel,
When made of aluminum, at least one side of the steel sheet pile body to which the drainage member is to be attached is welded or brazed to an appropriate portion where the drainage member and the steel sheet pile body are in contact with each other, and the steel sheet pile body is connected to the drainage member. Member can be firmly integrated.

【0069】(3) 排水用部材はいかなる材質であっても
機械的に鋼矢板本体に取付けることができる。例えば、
図14に示すようにナット24を鋼矢板本体1の適当な
位置に溶接接合しておき、排水用部材を取付けようとす
る鋼矢板本体1の面に接触させ、排水用部材の孔3を利
用してボルト25と座金26で排水用部材を取付けるこ
とができる。このボルトを利用した取付け方法は、単独
で採用することもできるし、上記(1) 、(2) に述べた取
付け方法と併用することもできる。
(3) The drainage member of any material can be mechanically attached to the steel sheet pile main body. For example,
As shown in FIG. 14, the nut 24 is welded to an appropriate position of the steel sheet pile main body 1 and brought into contact with the surface of the steel sheet pile main body 1 to which the drainage member is to be attached, and the hole 3 of the drainage member is used. Thus, the drainage member can be attached with the bolt 25 and the washer 26. The mounting method using the bolt can be used alone or in combination with the mounting methods described in (1) and (2) above.

【0070】(4) 前述の取付け方法において止水剤を利
用することもできる。すなわち、排水用部材と矢板本体
の接触面において止水剤を用いることができる。例え
ば、排水用部材の取付けに溶接接合を利用でき、平板の
排水用部材を矢板本体の凹面に取付ける場合、必ずしも
平板と矢板本体の接触面部分全長にわたり溶接する必要
はない。このとき、溶接しない部分、あるいは溶接する
部分においても平板と矢板本体の接触面において止水性
が懸念されれば、その接触面に止水剤を用いて排水用部
材で形成される排水路の水密性を図ることができる。
(4) A waterproofing agent may be used in the above-described mounting method. That is, a waterproof agent can be used on the contact surface between the drainage member and the sheet pile main body. For example, welding can be used to attach the drainage member, and when the flat drainage member is attached to the concave surface of the sheet pile main body, it is not necessary to weld over the entire contact surface portion between the flat plate and the sheet pile main body. At this time, if there is concern about the water stoppage at the contact surface between the flat plate and the sheet pile body even at the portion not to be welded or at the portion to be welded, the watertightness of the drainage channel formed by the drainage member using the water stoppage agent at the contact surface. Nature can be achieved.

【0071】本願発明の液状化抑止矢板としての排水機
能付矢板を地盤に設置した例を図15に示す。排水機構
は、少なくとも地盤の液状化層31の層厚以上の長さに
わたって矢板Aに設ければよい。地震時に、液状化層3
1に過剰間隙水圧が発生したとき矢板A周囲の地盤の間
隙水は排水用部材内に流入し上方へ排出される。したが
って、矢板周囲地盤の液状化防止ができる。
FIG. 15 shows an example in which a sheet pile with a drainage function as a liquefaction-preventing sheet pile of the present invention is installed on the ground. The drainage mechanism may be provided in the sheet pile A over at least the length of the liquefied layer 31 of the ground. Liquefaction layer 3 during earthquake
When excessive pore water pressure is generated in 1, the pore water in the ground around the sheet pile A flows into the drainage member and is discharged upward. Therefore, liquefaction of the ground around the sheet pile can be prevented.

【0072】本発明の液状化抑止矢板としての排水機能
付矢板を盛土へ適用した例を図16に示す。この矢板
は、最も液状化の可能性の高い盛土斜面法尻付近に設け
ている。この場合、地震時に盛土34が崩れようとして
も液状化が防止された地盤に設置された剛性のある矢板
Aによって盛土崩壊を阻止することができる。
FIG. 16 shows an example in which the sheet pile with drainage function as the liquefaction-preventing sheet pile of the present invention is applied to embankment. This sheet pile is provided near the slope slope of the embankment where liquefaction is most likely to occur. In this case, even if the embankment 34 is about to collapse during an earthquake, the collapse of the embankment can be prevented by the rigid sheet pile A installed on the ground where liquefaction is prevented.

【0073】本発明の液状化抑止矢板としての排水機能
付矢板を土留壁に適用した例を図17、図18に示す。
これらの図に示すとおり、土留壁の前後において液状化
層の層厚が異なる場合においても、排水機構は少なくと
も地盤の液状化層31,31aの層厚以上の長さにわた
って矢板Bに設けられていればよい。すなわち、排水用
部材は液状化層31aの上端より上にはなくてもよい。
本願発明の矢板を用いることによって地震時にも強固な
鋼矢板壁を作ることができる。
FIGS. 17 and 18 show examples in which the sheet pile with drainage function as the liquefaction-preventing sheet pile of the present invention is applied to a retaining wall.
As shown in these figures, even when the layer thickness of the liquefied layer is different before and after the retaining wall, the drainage mechanism is provided on the sheet pile B at least over the layer thickness of the liquefied layer 31, 31a of the ground. Just do it. That is, the drainage member may not be above the upper end of the liquefied layer 31a.
By using the sheet pile of the present invention, a strong steel sheet pile wall can be made even during an earthquake.

【0074】なお、以上述べた本発明の排水機能付矢板
は、液状化地盤以外の地盤に使用することにより、地盤
の圧密沈下などを促進するためのドレーン(排水)機能
を備えた矢板として利用することもできる。
The above-described sheet pile with a drainage function of the present invention is used as a sheet pile having a drain (drainage) function for promoting consolidation settlement of the ground, etc., by being used on the ground other than the liquefied ground. You can also.

【0075】例えば、粘性土質の地盤においては、液状
化は生じ難いが、地盤改良のため、各種ドレーン材を使
用して地盤の圧密沈下を促進することが行われている。
しかし、このような地盤においては、ドレーン材の施工
機械の制約上、土留めなどのために打設された矢板に近
接させてドレーン材(サンドドレーン、ペーパードレー
ン、プラスチックドレーンなど)を設置することができ
ない。
For example, liquefaction is unlikely to occur in a viscous soil, but for the purpose of improving the ground, consolidation settlement of the ground is promoted by using various drain materials.
However, in such ground, drain materials (sand drains, paper drains, plastic drains, etc.) must be installed in close proximity to the sheet piles that have been cast for earth retaining, etc. due to the limitations of the drain material construction machine. Can not.

【0076】この場合、矢板自体に排水機能を持たせる
ことにより地盤の圧密沈下を均質に促進させることがで
き、地盤改良効果および矢板の地盤支持機能を高めるこ
とができる。なお、この排水機能を有する矢板において
は、液状化時のように地盤の間隙水を速く排出する必要
は小さいので、液状化抑止用の矢板に比べて、排水路の
横断面は小さくすることも可能であり、また排水用部材
の開孔率も小さくすることも可能である。
In this case, by making the sheet pile itself have a drainage function, the consolidation settlement of the ground can be uniformly promoted, and the ground improvement effect and the ground support function of the sheet pile can be enhanced. In addition, in the sheet pile having this drainage function, it is not necessary to quickly discharge the interstitial water of the ground as in the case of liquefaction, so the cross section of the drainage channel may be made smaller than the sheet pile for preventing liquefaction. It is possible, and it is also possible to reduce the porosity of the drainage member.

【0077】この他、例えば圧密沈下の生ずる粘性土質
の層の上に、液状化の発生するおそれのある砂質土など
の層がある場合にも、本発明の排水機能付矢板を用いる
ことにより、圧密促進効果と液状化抑止効果および矢板
としての機能を併せて発揮させることも可能である。
In addition to this, for example, when there is a layer of sandy soil or the like where liquefaction may occur on a layer of viscous soil where consolidation settlement occurs, the sheet pile with drainage function of the present invention is used. It is also possible to exert the effect of promoting consolidation, the effect of suppressing liquefaction, and the function as a sheet pile.

【0078】[0078]

【発明の効果】 本願発明の排水機能付矢板を用いれば、地震時矢板
周囲の地盤の液状化が抑止できるので、耐震性能の高い
矢板構造物を提供することができる。また、排水機能付
矢板は液状化を抑止するだけでなく、地震時の不可測の
地盤の側方流動やすべりなどにも抵抗することができる
ので、盛土の補強材としても使うことができる。
EFFECT OF THE INVENTION Since the liquefaction of the ground around the sheet pile during an earthquake can be suppressed by using the sheet pile with a drainage function of the present invention, a sheet pile structure having high seismic performance can be provided. In addition, the sheet pile with drainage function not only prevents liquefaction, but also resists unintended lateral flow and slippage of the ground during an earthquake, and can be used as a reinforcing material for embankment.

【0079】 排水用部材としてリブ付き平板、箱形
構造板、格子状排水用部材などを用いることで、排水空
間が容易に確保され、かつリブの剛性により矢板施工時
や供用時の地盤からの水平圧力に対処でき、また製造も
容易である。
By using a flat plate with ribs, a box-shaped structural plate, a grid-like drainage member, or the like as the drainage member, a drainage space can be easily secured, and the rigidity of the rib allows the sheet pile to be removed from the ground during construction or operation. It can handle horizontal pressure and is easy to manufacture.

【0080】 排水用部材に多数の縦リブを設けた場
合、軽量で、剛性の高い排水用部材が提供でき、矢板本
体に一体的に取付けて地盤に設置した後、地盤の水平圧
力を受けても水平たわみが抑えられる。
When a large number of vertical ribs are provided on the drainage member, a lightweight and highly rigid drainage member can be provided. After the drainage member is integrally mounted on the sheet pile body and installed on the ground, it receives the horizontal pressure of the ground. Even horizontal deflection is suppressed.

【0081】 本願発明の排水機能付矢板は、地盤へ
の設置に当って従来の施工機器(バイブロハンマー、圧
入機など)を利用することができ、排水機構が矢板と一
体的に設けられているので、砕石などの排水手段を矢板
の施工後に矢板周辺に投入する必要もなく、液状化対策
を施した矢板を得るに当って施工能率が良好である。
The sheet pile with drainage function of the present invention can use conventional construction equipment (vibrohammer, press-fitting machine, etc.) for installation on the ground, and the drainage mechanism is provided integrally with the sheet pile. Therefore, it is not necessary to put drainage means such as crushed stones around the sheet pile after the sheet pile has been constructed, and the construction efficiency is good in obtaining a sheet pile with liquefaction measures.

【0082】 排水用部材と矢板本体で形成される中
空の排水路には地盤の土砂の侵入を阻止する所定のフィ
ルターが備えられているので、排水路が詰まって、液状
化抑止機能を損なうという心配がない。
Since the hollow drainage channel formed by the drainage member and the sheet pile body is provided with a predetermined filter for preventing soil from entering the ground, the drainage channel is clogged and the liquefaction inhibiting function is impaired. Don't worry.

【0083】 鋼矢板本体と排水用部材との間は吸水
膨潤性の止水剤を用いるなどして、簡易にかつ効果的に
止水することができ、両者の接触面からの土砂の侵入を
防止し、液状化時における排水路からの排水効果を維持
することができる。
The water can be easily and effectively stopped between the steel sheet pile main body and the drainage member by using a water-absorbing and swelling water-stopping agent, for example. Thus, the effect of drainage from the drainage channel during liquefaction can be maintained.

【0084】 フィルターは金網その他の格子状整形
補強材を用いて、容易に装着することができ、また現場
で排水路内へ挿入、充填することもできる。
The filter can be easily mounted using a wire mesh or other lattice-shaped reinforcing material, and can also be inserted and filled into the drainage channel on site.

【0085】 通常の矢板で構成される護岸や土留壁
では、その背後地盤を液状化抑止のために振動棒やサン
ドコンパクションパイルで締固めようとしても、護岸や
土留壁の数メートル以内は矢板に過大な応力が発生した
り、矢板がはらみ出して、締固めることができない。し
たがって、現状では護岸や土留壁近くには砕石ドレーン
をやむなく打設しているが、液状化防止対策の点からは
十分ではない。ところが、こうした護岸や土留壁に本願
発明の排水機能付矢板を用いれば、矢板近くの地盤の液
状化が確実に防止できるので、耐震製のある護岸や土留
壁が得られるという多大の利点がある。
In a seawall or earth retaining wall composed of ordinary sheet piles, even if an attempt is made to compact the ground behind with a vibrating rod or a sand compaction pile in order to suppress liquefaction, a sheet pile within a few meters of the seawall or earth retaining wall is used. Excessive stress is generated or the sheet pile protrudes and cannot be compacted. Therefore, at present, crushed stone drains are unavoidably installed near revetments and earth retaining walls, but this is not sufficient in terms of measures to prevent liquefaction. However, if the sheet pile with drainage function of the present invention is used for such a revetment or earth retaining wall, since the liquefaction of the ground near the sheet pile can be reliably prevented, there is a great advantage that a revetment or an earth retaining wall having earthquake resistance is obtained. .

【0086】 圧密沈下する粘性土質の地層を含む地
盤に矢板が設けられている場合、圧密沈下促進のため、
この地盤に従来のドレーン材が打たれることが多い。し
かし、矢板近傍地盤にはドレーン材を施工する機械の制
約上、ドレーン材を打つことができない。こうした場合
に本願発明の矢板を用いれば、地盤改良効果および矢板
の地盤支持機能を高めることができる。
When a sheet pile is provided on the ground including a viscous soil layer that consolidates and settles, in order to promote consolidation settlement,
A conventional drain material is often struck on this ground. However, the drain material cannot be hit on the ground near the sheet pile due to the restriction of the machine for constructing the drain material. In such a case, the use of the sheet pile of the present invention can improve the ground improvement effect and the ground support function of the sheet pile.

【図面の簡単な説明】[Brief description of the drawings]

【図1】請求項1に係るリブ付き平板を用いた排水機能
付矢板の水平断面図である。
FIG. 1 is a horizontal sectional view of a sheet pile with a drainage function using a flat plate with ribs according to claim 1;

【図2】図1の実施形態に対する変形例を示す水平断面
図である。
FIG. 2 is a horizontal sectional view showing a modified example of the embodiment shown in FIG. 1;

【図3】多数の縦リブを形成した排水用部材の一実施形
態を示す斜視図である。
FIG. 3 is a perspective view showing one embodiment of a drainage member formed with a number of vertical ribs.

【図4】排水用部材としての箱形構造板の一実施形態を
示す斜視図である。
FIG. 4 is a perspective view showing one embodiment of a box-shaped structural plate as a drainage member.

【図5】多数の縦リブを有するリブ付き平板または箱形
構造板を用いた液状化抑止矢板の一例を示す斜視図であ
る。
FIG. 5 is a perspective view showing an example of a liquefaction-inhibiting sheet pile using a ribbed flat plate or a box-shaped structural plate having a number of vertical ribs.

【図6】図5の実施形態に対応する平面図である。FIG. 6 is a plan view corresponding to the embodiment of FIG. 5;

【図7】請求項2に係る格子状排水用部材の一実施形態
を示す斜視図である。
FIG. 7 is a perspective view showing an embodiment of a grid-like drainage member according to claim 2;

【図8】図5の実施形態の変形例を示す平面図である。FIG. 8 is a plan view showing a modification of the embodiment of FIG. 5;

【図9】図5の実施形態の他の変形例を示す平面図であ
る。
FIG. 9 is a plan view showing another modification of the embodiment of FIG. 5;

【図10】フィルターの排水空間への装着方法の一例を
示す水平断面図である。
FIG. 10 is a horizontal sectional view showing an example of a method of mounting a filter in a drainage space.

【図11】整形補強材を用いたフィルターの排水空間へ
の装着方法の一例を示す斜視図である。
FIG. 11 is a perspective view showing an example of a method of mounting a filter using a shaping reinforcing material in a drainage space.

【図12】整形補強材を用いたフィルターの排水空間へ
の装着方法を示す水平断面図である。
FIG. 12 is a horizontal sectional view showing a method of mounting a filter using a shaping reinforcing material in a drainage space.

【図13】整形補強材を用いたフィルターの排水空間へ
の装着方法の他の例を示す水平断面図である。
FIG. 13 is a horizontal sectional view showing another example of a method of mounting a filter using a shaping reinforcing material in a drainage space.

【図14】排水用部材の取付けの一例を示す水平断面図
である。
FIG. 14 is a horizontal sectional view showing an example of attachment of a drainage member.

【図15】本願発明の排水機能付矢板の適用例を示した
鉛直断面図である。
FIG. 15 is a vertical sectional view showing an application example of the sheet pile with drainage function of the present invention.

【図16】本願発明の排水機能付矢板の他の適用例を示
した鉛直断面図である。
FIG. 16 is a vertical sectional view showing another application example of the sheet pile with a drainage function of the present invention.

【図17】本願発明の排水機能付矢板のさらに他の適用
例を示した図は断面斜視図である。
FIG. 17 is a sectional perspective view showing still another application example of the sheet pile with drainage function of the present invention.

【図18】本願発明の排水機能付矢板のさらに他の適用
例を示した鉛直断面図である。
FIG. 18 is a vertical sectional view showing still another application example of the sheet pile with a drainage function of the present invention.

【符号の説明】[Explanation of symbols]

A,B…排水機能付矢板、1…矢板本体、3…小孔、4
…フィルター、5,5a…排水路、8a…整形補強材、
13a…リブ付き平板、14…先端保護プレート、15
…縦リブ、16…リブ付き平板、17…縦リブ、18…
箱形構造板、19…縦リブ、20…格子状排水用部材、
21…縦リブ、22…横板状部材、24…ナット、25
…ボルト、26…座金、31,31a…液状化のおそれ
のある地盤、32…盛土、33…排水溝、34…盛土
A, B: sheet pile with drainage function, 1: sheet pile main body, 3: small hole, 4
... Filter, 5,5a ... Drainage channel, 8a ... Shaping reinforcement,
13a: flat plate with ribs, 14: protection plate at the tip, 15
... vertical ribs, 16 ... flat plate with ribs, 17 ... vertical ribs, 18 ...
Box-shaped structural plate, 19: vertical rib, 20: lattice-shaped drainage member,
Reference numeral 21: vertical rib, 22: horizontal plate member, 24: nut, 25
... Bolts, 26 ... Washers, 31, 31a ... Soil that may be liquefied, 32 ... Filling, 33 ... Drain, 34 ... Filling

───────────────────────────────────────────────────── フロントページの続き (72)発明者 喜田 浩 大阪市中央区北浜4丁目5番33号 住友 金属工業株式会社内 (56)参考文献 特開 平1−125413(JP,A) 特開 昭62−146315(JP,A) 特開 昭63−11710(JP,A) 特許2725273(JP,B2) 特許2833036(JP,B2) 特許2668922(JP,B2) 特公 平4−59405(JP,B2) 特公 昭51−36935(JP,B2) (58)調査した分野(Int.Cl.7,DB名) E02D 5/02 - 5/04 E02D 3/10 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Kida 4-33, Kitahama, Chuo-ku, Osaka City Inside Sumitomo Metal Industries, Ltd. (56) References JP-A-1-125413 (JP, A) JP-A Sho 62-146315 (JP, A) JP-A-63-11710 (JP, A) Patent 2725273 (JP, B2) Patent 2833036 (JP, B2) Patent 2689222 (JP, B2) Japanese Patent Publication No. 4-59405 (JP, B2) (JP, B2) (58) Fields surveyed (Int. Cl. 7 , DB name) E02D 5/02-5/04 E02D 3/10

Claims (8)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 矢板の所定区間に、排水用部材として複
数の鉛直方向のリブおよび多数の開口部を有するリブ付
き平板を、前記リブを有する側を矢板本体側に向けて、
矢板本体の少なくとも片面に長手方向に沿って設け、該
リブ付き平板と前記矢板本体とで内側に中空の排水空間
を形成するとともに、該平板には前記開口部から前記排
水空間内への土砂の侵入を防ぐためのフィルターを装着
したことを特徴とする排水機能付矢板。
In a predetermined section of a sheet pile, a ribbed flat plate having a plurality of vertical ribs and a large number of openings as a drainage member, with the side having the rib facing the sheet pile body,
At least one surface of the sheet pile main body is provided along the longitudinal direction, and the ribbed flat plate and the sheet pile main body form a hollow drainage space inside, and the flat plate is formed of soil and sand from the opening to the drainage space. A sheet pile with drainage function, equipped with a filter to prevent intrusion.
【請求項2】 矢板の所定区間に、排水用部材として複
数の鉛直方向の縦リブとこれに交差する横板状部材とを
それぞれ所定間隔をおいて格子状に組合せて、多数の開
口部を形成してなる格子状排水用部材を、矢板本体の少
なくとも片面に長手方向に沿って設け、該格子状排水用
部材と前記矢板本体とで内側に中空の排水空間を形成す
るとともに、該格子状排水用部材には前記開口部から前
記排水空間内への土砂の侵入を防ぐためのフィルターを
装着したことを特徴とする排水機能付矢板。
2. In a predetermined section of a sheet pile, a plurality of vertical ribs as draining members and horizontal plate-like members intersecting the vertical ribs are combined in a grid pattern at predetermined intervals to form a large number of openings. A lattice-shaped drainage member formed is provided on at least one surface of the sheet pile main body along the longitudinal direction, and a hollow drainage space is formed inside the lattice-shaped drainage member and the sheet pile main body, and the lattice-shaped drainage member is formed. A sheet pile with a drainage function, wherein a filter for preventing intrusion of earth and sand from the opening into the drainage space is attached to the drainage member.
【請求項3】 前記排水用部材と矢板本体との接触面の
間に止水剤を介在させたことを特徴とする請求項1また
は2記載の排水機能付矢板。
3. A sheet pile with a drainage function according to claim 1, wherein a water-stopping agent is interposed between a contact surface between the drainage member and the sheet pile main body.
【請求項4】 矢板の所定区間に、排水用部材として1
対の平板間に複数の鉛直方向のリブを設けて、内側に複
数の箱形の中空の排水用空間を形成するとともに、前記
平板の少なくとも一つに多数の開口部を形成してなるリ
ブ付き箱形構造板を、矢板本体の少なくとも片面に長手
方向に沿って設け、該箱形構造板には前記開口部から前
記排水空間内への土砂の侵入を防ぐためのフィルターを
装着したことを特徴とする排水機能付矢板。
4. In a predetermined section of a sheet pile, one member as a drainage member is provided.
A plurality of vertical ribs are provided between a pair of flat plates, and a plurality of box-shaped hollow drainage spaces are formed inside, and a plurality of openings are formed in at least one of the flat plates. A box-shaped structure plate is provided on at least one surface of the sheet pile main body along the longitudinal direction, and the box-shaped structure plate is provided with a filter for preventing intrusion of earth and sand from the opening into the drainage space. Sheet pile with drainage function.
【請求項5】 前記フィルターは該フィルターの形状を
保持するための整形補強材を用いて装着されている請求
項1、2、3または4記載の排水機能付矢板。
5. The sheet pile with drainage function according to claim 1, wherein the filter is mounted using a shaping reinforcing material for maintaining the shape of the filter.
【請求項6】 矢板を地盤に打設した後、現場で前記フ
ィルターを前記排水空間内に装着することを特徴とする
請求項5記載の排水機能付矢板用フィルターの装着方
法。
6. The method according to claim 5, wherein the filter is mounted in the drainage space on site after the sheet pile has been cast on the ground.
【請求項7】 長手方向に延びる複数のリブおよび前記
リブ間に多数の開口部を設けてなるリブ付き平板の、少
なくとも前記開口部位置に土砂の侵入を防ぐためのフィ
ルターを装着した排水機能付矢板の排水用部材。
7. A drainage function provided with a plurality of ribs extending in the longitudinal direction and a flat plate with ribs provided with a large number of openings between the ribs, wherein a filter for preventing intrusion of earth and sand is provided at least at the positions of the openings. Drainage material for sheet pile.
【請求項8】 1対の平板間に長手方向に延びる複数の
リブを設けて、内側に複数の箱形の中空の排水用空間を
形成するとともに、前記平板の少なくとも一つに多数の
開口部を形成するとともに、少なくとも前記開口部位置
に土砂の侵入を防ぐためのフィルターを装着した排水機
能付矢板の排水用部材。
8. A plurality of longitudinally extending ribs are provided between a pair of flat plates to form a plurality of box-shaped hollow drainage spaces inside, and a plurality of openings in at least one of the flat plates. And a drainage member with a drainage function provided with a filter for preventing intrusion of earth and sand into at least the opening position.
JP10195297A 1988-11-11 1998-07-10 Sheet pile with drainage function, method of mounting filter for sheet pile, and drainage member Expired - Fee Related JP3031336B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10195297A JP3031336B2 (en) 1988-11-11 1998-07-10 Sheet pile with drainage function, method of mounting filter for sheet pile, and drainage member

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP63-147058 1988-11-11
JP14705888 1988-11-11
JP10195297A JP3031336B2 (en) 1988-11-11 1998-07-10 Sheet pile with drainage function, method of mounting filter for sheet pile, and drainage member

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP1209810A Division JP2833036B2 (en) 1988-11-11 1989-08-14 Sheet pile with drainage function and method of mounting filter for sheet pile

Publications (2)

Publication Number Publication Date
JPH1171750A JPH1171750A (en) 1999-03-16
JP3031336B2 true JP3031336B2 (en) 2000-04-10

Family

ID=26477723

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Country Link
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