JPH0995933A - Liquefaction preventing device for ground - Google Patents
Liquefaction preventing device for groundInfo
- Publication number
- JPH0995933A JPH0995933A JP25265395A JP25265395A JPH0995933A JP H0995933 A JPH0995933 A JP H0995933A JP 25265395 A JP25265395 A JP 25265395A JP 25265395 A JP25265395 A JP 25265395A JP H0995933 A JPH0995933 A JP H0995933A
- Authority
- JP
- Japan
- Prior art keywords
- casing
- sheet pile
- ground
- steel
- drain
- 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.)
- Granted
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、地震時に砂質地盤
に発生する液状化を防止し、各種構造物の液状化被害を
防止することのできる地盤の液状化防止装置に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground liquefaction prevention apparatus capable of preventing liquefaction generated in sandy ground during an earthquake and preventing liquefaction damage of various structures.
【0002】[0002]
【従来の技術】砂質地盤の液状化防止対策としては種々
提案されているが、その一例として特公平6−1199
0号公報(以下従来技術1という)に記載された発明が
ある。この発明は、振動を利用してケーシングを砂質地
盤にその砂質地盤を締固めつつ打込む工程と、地盤の所
定圧力に対する耐圧性を有し周壁に透水用の孔を開設し
たパイプに透水性フィルタを被せてなるドレーンパイプ
をケーシングに挿入する工程と、ケーシングを砂質地盤
から引抜いて砂質地盤にドレーンパイプを残留させる工
程とを有し、砂質地盤中の過剰間隙水圧をドレーンパイ
プを用いて低下させるようにした砂質地盤の液状化防止
工法に関するものである。2. Description of the Related Art Various measures have been proposed to prevent liquefaction of sandy ground.
There is an invention described in Japanese Patent Publication No. 0 (hereinafter referred to as Prior Art 1). The present invention relates to a process of driving a casing into a sandy ground by using vibration while compacting the sandy ground, and a method of permeating a pipe having a pressure resistance against a predetermined pressure of the ground and having a hole for water permeation formed in a peripheral wall. Inserting a drain pipe covered with a porous filter into the casing, and withdrawing the casing from the sandy ground to leave the drain pipe in the sandy ground, and draining excess pore water pressure in the sandy ground. The present invention relates to a method for preventing liquefaction of sandy ground which is reduced by using the method.
【0003】また、特開平2−225712号公報(以
下従来技術2という)に開示された発明は、矢板本体の
長手方向に沿った所定区間に、多数の開口部とこの開口
部からの地盤の侵入を防止するためのフィルタを備えた
排水用部材を1条又は複数条、少なくとも矢板本体の片
面に設けたものである。The invention disclosed in Japanese Patent Application Laid-Open No. 2-225712 (hereinafter referred to as "prior art 2") has a large number of openings in a predetermined section along the longitudinal direction of the sheet pile body and the ground from the openings. One or a plurality of drainage members provided with a filter for preventing intrusion are provided on at least one surface of the sheet pile body.
【0004】[0004]
【発明が解決しようとする課題】従来技術1の発明は、
ドレーンパイプと矢板を別々に施工しなければならない
ので、施工時間に制約がある場合は対応が困難であり、
施工性に問題がある。また、従来技術2の発明は、あら
かじめ排水用部材を取付けた鋼矢板を打設するようにし
ているため施工時間の短縮を図ることができるが、施工
時間の短縮による効果以上に排水用部材の加工及び鋼矢
板への取付けにコストがかかり、経済性の面で問題があ
る。DISCLOSURE OF THE INVENTION The invention of the prior art 1 is
Since the drain pipe and sheet pile must be constructed separately, it is difficult to cope if there are restrictions on the construction time,
There is a problem in workability. Further, the invention of the prior art 2 is capable of shortening the construction time because the steel sheet pile to which the drainage member is previously attached is cast, but the drainage member can be reduced more than the effect of shortening the construction time. Processing and mounting on steel sheet piles are costly and have problems in terms of economy.
【0005】本発明は、上記の課題を解決すべくなされ
たもので、矢板に排水機能を付加することにより施工時
間を短縮でき、その上安価で施工が容易な地盤の液状化
防止装置を得ることを目的としたものである。The present invention has been made to solve the above-mentioned problems, and by adding a drainage function to the sheet pile, the construction time can be shortened, and a liquefaction prevention device for the ground which is inexpensive and easy to construct is obtained. This is the purpose.
【0006】[0006]
(1)本発明に係る地盤の液状化防止装置は、地盤に打
設される矢板と、該矢板に取付けられる端面保護部材
と、筒状又はほぼU字状に形成され、先端部が前記端面
保護部材に着脱自在に連結されるケーシングと、前記端
面保護部材に連結されたケーシングを前記矢板とほぼ平
行に保持する取付け部材と、吸水性又は透水性を有し、
前記ケーシング内又はケーシングと矢板の間に形成され
た筒状部内に装入される棒状又は筒状のドレーン部材と
からなるものである。(1) A ground liquefaction prevention apparatus according to the present invention is a sheet pile that is driven into the ground, an end face protection member that is attached to the sheet pile, and is formed in a tubular shape or a substantially U shape, and the tip portion is the end surface. A casing removably connected to the protection member, a mounting member for holding the casing connected to the end face protection member substantially parallel to the sheet pile, and having water absorption or water permeability,
It comprises a rod-shaped or tubular drain member that is inserted into the casing or a tubular portion formed between the casing and the sheet pile.
【0007】また、上記(1)の地盤の液状化防止装置
において、(2)矢板が、鋼矢板、H形鋼、矢板付きH
形鋼、鋼管、矢板付き鋼管又はコンクリート杭の何れか
であり、(3)端面保護部材が、ケーシングの内面に嵌
合する内面嵌合部又はケーシングの外面に嵌合する外面
嵌合部の何れか一方又は両者を備えたものである。Further, in the ground liquefaction prevention device of (1) above, (2) the sheet pile is a steel sheet pile, an H-shaped steel, or a sheet pile H
It is either a shaped steel, a steel pipe, a steel pipe with a sheet pile, or a concrete pile, and either (3) the end face protection member is an inner face fitting part fitted to the inner face of the casing or an outer face fitting part fitted to the outer face of the casing. One or both are provided.
【0008】さらに、(4)ケーシングが、鋼管、ほぼ
U字状又はほぼV字状の形鋼の何れかであり、(5)ド
レーン部材が、合成樹脂製又は金属製の穴あき耐圧管で
あり、地盤中において液状化現象の原因となる過剰間隙
水圧を低下させる機能を有するものである。Further, (4) the casing is a steel pipe, or a substantially U-shaped or V-shaped steel, and (5) the drain member is a perforated pressure resistant pipe made of synthetic resin or metal. It has a function of lowering the excessive pore water pressure that causes a liquefaction phenomenon in the ground.
【0009】[0009]
【発明の実施の形態】図1は本発明の一実施形態を示す
もので、(a)は正面図、(b)はそのA−A断面図、
図2は図1の分解斜視図である。また、図3は図1
(a)のB−B拡大断面図、C−C拡大断面図及びD−
D拡大断面図である。図において、1は鋼矢板、2は角
鋼管21からなり鋼矢板1より短いケーシング、3は鋼
矢板1の内面下部に固定され、ケーシング2の下部が連
結される端面保護部材、4,4は鋼矢板1の内面上部に
固定され、ケーシング2を保持する取付け部材、5,5
は例えばポリエチレン製の穴あき耐圧管からなるドレー
ン部材である。以下上記各部材についてそれぞれ詳細に
説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. (A) is a front view, (b) is a sectional view taken along line AA,
FIG. 2 is an exploded perspective view of FIG. FIG. 3 shows FIG.
(A) BB enlarged sectional view, CC enlarged sectional view and D-
It is a D expanded sectional view. In the figure, 1 is a steel sheet pile, 2 is a casing made of square steel pipes 21 and shorter than the steel sheet pile 1, 3 is an end face protection member that is fixed to the lower inner surface of the steel sheet pile 1, and the lower portion of the casing 2 is connected, 4, 4 Mounting members fixed to the upper inner surface of the steel sheet pile 1 and holding the casing 2, 5, 5
Is a drain member made of, for example, a perforated pressure resistant pipe made of polyethylene. Hereinafter, each of the above members will be described in detail.
【0010】鋼矢板1は、図1〜図3では断面ほぼコ字
状の鋼矢板1を用いた場合を示したが、例えば、図6に
示すH形鋼11、図7(a)に示す矢板付きH形鋼1
2、(b)図に示すような鋼管13、(c)図に示すよ
うな矢板付き鋼管14などを用いてもよく、さらには、
コンクリート杭、既製の鉄筋コンクリート杭、プレスト
レスコンクリート杭、鋼管コンクリート杭など(以下こ
れらを一括してコンリート杭という)であってもよい。
以下本明細書においては、上述の各種矢板、鋼管、杭な
どを総称して矢板という。The steel sheet pile 1 shown in FIGS. 1 to 3 is a case where the steel sheet pile 1 having a substantially U-shaped cross section is used. For example, the H section steel 11 shown in FIG. 6 and FIG. 7 (a) are shown. H-section steel with sheet pile 1
2, a steel pipe 13 as shown in FIG. 2 (b), a steel pipe 14 with a sheet pile as shown in FIG. 2 (c), etc. may be used.
Concrete piles, ready-made reinforced concrete piles, prestressed concrete piles, steel pipe concrete piles, and the like (hereinafter collectively referred to as “concrete piles”) may be used.
Hereinafter, in the present specification, the above-described various sheet piles, steel pipes, piles, and the like are collectively referred to as sheet piles.
【0011】ケーシング2は、図には断面長方形の鋼管
21を用いた場合を示したが、鋼板を溶接して断面長方
形状又は断面ほぼU字状、V字状などに形成してもよ
く、あるいは、図4に示すような断面ほぼU字状の溝形
鋼22や断面ほぼV字状の形鋼、図5に示すような断面
円形の鋼管23を用いるなど、適宜の断面形状の部材を
用いることができる。The casing 2 is shown in the drawing as a case where a steel pipe 21 having a rectangular cross section is used, but a steel plate may be welded to form a rectangular cross section or a substantially U-shaped or V-shaped cross section. Alternatively, a member having an appropriate cross-sectional shape, such as a channel steel 22 having a substantially U-shaped cross-section as shown in FIG. 4, a shape steel having a substantially V-shaped cross-section or a steel pipe 23 having a circular cross-section as shown in FIG. Can be used.
【0012】端面保護部材3は、図2及び図3〜図5の
(c)に示すように、その内形がケーシング2の外形と
ほぼ等しく、ケーシング2の外面が内側に嵌入しうる大
きさで、かつ上部が開口された平面ほぼコ字状の外面嵌
合部31を有し(外袋タイプ)、下部には船の舳先のよ
うに三角形状又は三角錐状などにより尖鋭部が形成され
ている。As shown in FIGS. 2 and 3 to 5C, the end surface protection member 3 has an inner shape substantially equal to the outer shape of the casing 2, and a size such that the outer surface of the casing 2 can be fitted inside. In addition, it has an outer surface fitting portion 31 having a substantially U-shape in plan view with an open upper portion (outer bag type), and a sharp portion is formed in the lower portion by a triangular shape or a triangular pyramid shape like a bow of a ship. ing.
【0013】また、この端面保護部材3は、図8に示す
ように、その外形をケーシング2の内形とほぼ等しく、
ケーシング2の内面が外側に嵌合しうる大きさで、かつ
断面ほぼコ字状の内面嵌合部32を有し(内袋タイ
プ)、例えば、その両側壁の下方に丸棒などを溶接して
当接部33,33を設け、あるいは、さらに、前面にL
字状の保持板34を溶接して前壁との間にケーシング2
の嵌合部35を形成するなど、ケーシング2の下端部が
その外側に嵌合しうるように形成してもよい。As shown in FIG. 8, the end face protecting member 3 has an outer shape substantially equal to the inner shape of the casing 2,
The inner surface of the casing 2 has an inner surface fitting portion 32 having a substantially U-shaped cross section and having a size capable of fitting to the outer side (inner bag type). For example, a round bar or the like is welded below both side walls thereof. Abutment parts 33, 33 are provided, or L
The holding plate 34 in the shape of a letter is welded to form the casing 2 between it and the front wall.
The lower end portion of the casing 2 may be formed so that it can be fitted to the outside thereof, for example, by forming the fitting portion 35 of FIG.
【0014】さらに、端面保護部材3を円筒状に形成し
た場合は、上記と同様に平滑な外面嵌合部31又は内面
嵌合部32を設けてもよく、あるいは、外面嵌合部31
の内周にめねじを設け、又は内面嵌合部32の外周にお
ねじを設けると共に、ケーシング2の下部にこれに対応
するおねじ又はめねじを設けてねじ結合するようにして
もよい。上記の説明では、端面保護部材3の下部を尖鋭
に形成した場合を示したが、平坦に形成してもよい。Further, when the end face protecting member 3 is formed in a cylindrical shape, a smooth outer surface fitting portion 31 or inner surface fitting portion 32 may be provided as described above, or the outer surface fitting portion 31.
A female thread may be provided on the inner periphery of the casing 2, or a screw may be provided on the outer periphery of the inner surface fitting portion 32, and a male screw or a female screw corresponding to the female screw may be provided on the lower portion of the casing 2 for screw connection. In the above description, the case where the lower portion of the end face protection member 3 is formed to be sharp is shown, but it may be formed to be flat.
【0015】このような端面保護部材3は、コ字状の開
口部を矢板1の下部内面に当接して溶接により固定し、
あるいは、ボルト・ナットにより着脱可能に取付けられ
る。なお、円筒状の端面保護部材3の場合は、直接又は
取付腕を介して溶接により矢板1に固定され、又はボル
ト・ナットにより着脱可能に矢板1に取付けられる。In such an end face protecting member 3, the U-shaped opening is brought into contact with the lower inner surface of the sheet pile 1 and fixed by welding,
Alternatively, it is detachably attached with bolts and nuts. In the case of the cylindrical end face protection member 3, it is fixed to the sheet pile 1 by welding directly or through the mounting arm, or detachably attached to the sheet pile 1 with bolts and nuts.
【0016】取付け部材4,4は、図2〜図4に示すよ
うに、ほぼL字状の金具からなり、一方の片41,41
に設けたねじ挿通穴43に挿通したボルト6を矢板1に
設けたねじ挿通穴11に挿通し、他方の片42,42の
間にケーシング2を挟持してナット61で着脱自在に固
定し、ケーシング2を強固に保持する。この場合、取付
け部材4,4の一方の片41,41を矢板1に溶接して
固定してもよく、また、他方の片42,42とケーシン
グ2とをボルト・ナットで固定してもよい。さらに、一
方の片41,41に設けたねじ挿通穴43,43を長穴
にすれば、ケーシング2の挟持が容易である。As shown in FIGS. 2 to 4, the mounting members 4 and 4 are substantially L-shaped metal fittings, and one of the pieces 41, 41.
The bolt 6 inserted into the screw insertion hole 43 provided in the insert is inserted into the screw insertion hole 11 provided in the sheet pile 1, the casing 2 is sandwiched between the other pieces 42, 42, and the nut 61 is detachably fixed, Hold the casing 2 firmly. In this case, one piece 41, 41 of the mounting members 4, 4 may be welded and fixed to the sheet pile 1, or the other piece 42, 42 and the casing 2 may be fixed with bolts and nuts. . Further, if the screw insertion holes 43, 43 provided in the one piece 41, 41 are elongated holes, the casing 2 can be easily clamped.
【0017】また、ケーシング2に鋼管23を用いた場
合は、図5に示すように、取付部材4をほぼΩ状に形成
し、ケーシング2の外周を保持部材45,45を介して
包囲し、その腕部44,44をボルト6とナット61に
より矢板1に着脱自在に固定すればよい。なお、取付け
部材4は上記の構造に限定するものではなく、ケーシン
グ2の形状に応じて適宜変更することができる。When the steel pipe 23 is used for the casing 2, as shown in FIG. 5, the mounting member 4 is formed in a substantially Ω shape, and the outer periphery of the casing 2 is surrounded by the holding members 45, 45. The arms 44, 44 may be detachably fixed to the sheet pile 1 with the bolt 6 and the nut 61. The mounting member 4 is not limited to the structure described above, and can be appropriately changed according to the shape of the casing 2.
【0018】ドレーン部材5は、例えば、ポリエチレン
の如き合成樹脂製の耐圧管の周壁に多数の穴51を設け
た吸水性又は透水性を有する棒状又は筒状のもので、必
要に応じて、穴51から土砂の侵入を防止するために、
例えば、図8に示すように、吸水性又は透水性及び耐食
性を有する合成繊維製、合成樹脂製、ステンレス製など
のフィルタ52で被覆してもよい。なお、このドレーン
部材5は合成樹脂製に限定するものではなく、ステンレ
スの如き耐食性を有する金属管で構成してもよい。The drain member 5 is, for example, a water-absorbing or water-permeable rod-shaped or tubular member having a large number of holes 51 formed in the peripheral wall of a pressure-resistant tube made of synthetic resin such as polyethylene. In order to prevent the infiltration of earth and sand from 51,
For example, as shown in FIG. 8, the filter 52 may be covered with a filter 52 made of synthetic fiber, synthetic resin, stainless steel, or the like having water absorption or water permeability and corrosion resistance. The drain member 5 is not limited to the synthetic resin, and may be a metal tube having corrosion resistance such as stainless steel.
【0019】上記のような各部材からなる本発明におい
ては、図1〜図3に示すように、矢板1の内面下部に端
面保護部材3を溶接、ねじ止め等により取付け、ケーシ
ング2を矢板1の内面に沿って配設し、その下端部を、
端面保護部材3の外面嵌合部31に、尖鋭部の内壁に当
るまで嵌入する。ついで、ケーシング2の上部を矢板1
に取付けた取付け部材4,4により矢板1とほぼ平行に
固定し、最後にケーシング2内にドレーン部材5,5を
装入すれば、各部材を一体化することができる。In the present invention comprising the above-mentioned members, as shown in FIGS. 1 to 3, the end face protection member 3 is attached to the lower inner surface of the sheet pile 1 by welding, screwing or the like, and the casing 2 is attached to the sheet pile 1. Arranged along the inner surface of the
The end face protection member 3 is fitted into the outer fitting portion 31 until it hits the inner wall of the sharpened portion. Then, place the upper part of the casing 2 on the sheet pile 1.
The members can be integrated by fixing them substantially parallel to the sheet pile 1 by the mounting members 4 and 4 mounted on the casing 2, and finally inserting the drain members 5 and 5 into the casing 2.
【0020】また、図4に示すように、ケーシング2と
して溝形鋼22又は断面V字状の形鋼などを用いた場合
は、開口部側を矢板1に当接し、その下部を端面保護部
材3に嵌合して上部を取付け部材4で固定し、矢板1と
ケーシング2との間に形成された筒状部にドレーン部材
5,5を装入すればよい。さらに内面嵌合部32を有す
る端面保護部材3の場合は、ケーシング2をその下端部
が当接部等33に当るまで嵌合すればよく、端面保護部
材3及びケーシング2の下端部にねじを設けた場合は、
このねじを螺合して両者を連結すればよい。Further, as shown in FIG. 4, when a grooved steel 22 or a V-shaped steel section is used as the casing 2, the opening side is in contact with the sheet pile 1 and the lower part thereof is an end face protection member. 3 and the upper part is fixed by the attachment member 4, and the drain members 5 and 5 may be inserted into the tubular portion formed between the sheet pile 1 and the casing 2. Further, in the case of the end surface protection member 3 having the inner surface fitting portion 32, the casing 2 may be fitted until the lower end portion of the end surface comes into contact with the contact portion 33 or the like, and a screw is attached to the end surface protection member 3 and the lower end portion of the casing 2. If provided,
These screws may be screwed together to connect the two.
【0021】なお、各部材を一体化するにあたっては、
矢板1に端面保護部材3を取付け、これにあらかじめド
レーン部材5を装入したケーシング2を取付け、あるい
は、端面保護部材3を取付けたケーシング2にドレーン
部材5を装入し、これを矢板1に取付けてもよく、さら
には、あらかじめドレーン部材5を装入したケーシング
2に端面保護部材3を取付け、これを矢板1に取付ける
など、適宜変更することができる。Incidentally, in integrating each member,
The end face protection member 3 is attached to the sheet pile 1, and the casing 2 in which the drain member 5 is previously attached is attached thereto, or the drain member 5 is placed in the casing 2 in which the end face protection member 3 is attached, and this is attached to the sheet pile 1. The end face protection member 3 may be attached to the casing 2 in which the drain member 5 is inserted in advance, and the end face protection member 3 may be attached to the sheet pile 1.
【0022】このようにして一体化された矢板1、ケー
シング2、端面保護部材3、取付け部材4,4及びドレ
ーン部材5,5は、矢板1を地盤に打設することにより
一体的に地盤中に埋設される。そして、打設が終ったと
きは、取付け部材4,4を外すか又は緩め、矢板1、端
面保護部材3及びドレーン部材5,5を地盤中に残置し
た状態でケーシング2を引抜く。この場合、ケーシング
2を矢板1から離脱させてもよく、あるいは、ケーシン
グ2を途中まで引上げてその位置で保持するようにして
もよい。なお、ケーシング2を取付けた状態で矢板1を
打設し、打設が終ったのちドレーン部材5,5をケーシ
ング2内に装入し、ついで、ケーシング2を引抜いても
よい。The sheet pile 1, the casing 2, the end face protection member 3, the mounting members 4, 4 and the drain members 5, 5 which are integrated in this way are integrally formed in the ground by driving the sheet pile 1 into the ground. Buried in. When the driving is finished, the mounting members 4 and 4 are removed or loosened, and the casing 2 is pulled out while the sheet pile 1, the end face protection member 3 and the drain members 5 and 5 are left in the ground. In this case, the casing 2 may be detached from the sheet pile 1, or the casing 2 may be pulled up partway and held at that position. Alternatively, the sheet pile 1 may be driven with the casing 2 attached, and after the driving is completed, the drain members 5 and 5 may be inserted into the casing 2 and then the casing 2 may be pulled out.
【0023】ところで、ケーシング2を引抜く際に、ド
レーン部材5,5も一緒に上ってしまう(供上り)おそ
れがある。そこで、本発明においては、次のような供上
り防止対策を講じた。すなわち、図8に示すように、端
面保護部材3に内面嵌合部32を形成し、その上端部に
フック37を有するキャップ36を取付ける。そして、
ドレーン部材5,5に被覆した合成繊維製のフィルタ5
2,52の下端部をこのフック37に巻付けて固定する
ようにした。これにより、ケーシング2を引抜いてもド
レーン部材5,5は端面保護部材3に保持され、供上り
することはない。By the way, when the casing 2 is pulled out, the drain members 5 and 5 may also go up (up). Therefore, in the present invention, the following supply prevention measures are taken. That is, as shown in FIG. 8, the inner surface fitting portion 32 is formed on the end surface protecting member 3, and the cap 36 having the hook 37 is attached to the upper end portion thereof. And
Filter 5 made of synthetic fiber coated on drain members 5 and 5
The lower ends of 2, 52 are wound around the hook 37 to be fixed. As a result, even if the casing 2 is pulled out, the drain members 5 and 5 are held by the end face protection member 3 and do not come up.
【0024】また、ドレーン部材5,5の下端部にフッ
ク付きのキャップを取付け、このフックを端面保護部材
3に設けた止め金具に係止させるようにしてもよく、あ
るいは、ケーシング2が例えば図4に示すように溝形鋼
22からなる開断面の場合は、矢板1のドレーン部材
5,5の頂部と対応する位置に、ドレーン部材5,5側
に突出する押え部材を取付け、ドレーン部材5,5の供
上りを阻止するようにしてもよい。A cap with a hook may be attached to the lower end portions of the drain members 5 and 5, and the hook may be engaged with a stopper provided on the end face protection member 3, or the casing 2 may be, for example, as shown in FIG. As shown in FIG. 4, in the case of the open cross section made of the channel steel 22, a holding member projecting to the drain member 5, 5 side is attached at a position corresponding to the top of the drain member 5, 5 of the sheet pile 1. , 5 may be blocked.
【0025】さらに、ドレーン部材5,5の下端部がキ
ャップなどで閉塞されている場合は、例えば、ドレーン
部材5,5の内径より細い棒鋼からなり、上部にワイヤ
などを取付けた重りをドレーン部材5,5内に挿入して
先端部を着底させ、ケーシング2を引抜く際に反力とし
て作用させて供上りを防止し、ケーシング2の引抜きが
終ったときは重りを引上げるようにしてもよい。また、
ドレーン部材5,5の下端部が閉塞されていない場合
は、重りの上部に直接又はワイヤ等を介してドレーン部
材5,5の外形より大きい板材を取付け、重りをドレー
ン部材5,5内に挿入して板材をその頂部に載置し、反
力として作用させるなど、適宜の手段を用いることがで
きる。Further, when the lower ends of the drain members 5 and 5 are closed by a cap or the like, for example, a weight made of steel bar having a diameter smaller than the inner diameter of the drain members 5 and 5 and having a wire or the like attached to the upper portion thereof is used as the drain member. Insert the inside of the casing 5 and 5 to set the tip to the bottom, and act as a reaction force when pulling out the casing 2 to prevent it from rising, and pull up the weight when the casing 2 is pulled out. Good. Also,
When the lower ends of the drain members 5 and 5 are not closed, a plate material larger than the outer shape of the drain members 5 and 5 is attached to the upper portion of the weight directly or via a wire, and the weight is inserted into the drain members 5 and 5. Then, an appropriate means such as placing the plate member on the top of the plate member and acting it as a reaction force can be used.
【0026】上記のように構成した本発明装置において
は、矢板1に近接してドレーン部材5を設け、両者を同
時に地盤中に打設するようにしたので、施工が容易で工
期を短縮することができる。また、矢板1の打設に際し
て、矢板1、ケーシング2及び端面保護部材3により周
囲の地盤の土止め、締切り、締固めが並行して行われる
ので、地盤の液状化に対する強度を増加することができ
る。さらに、ドレン部材5に地下水を流入させて地盤中
に発生する過剰間隙水圧を消散させると共に、これに近
接して強度の大きい矢板1を設けたので、各種構造物の
液状化被害を防止することができる。In the apparatus of the present invention constructed as described above, the drain member 5 is provided close to the sheet pile 1 and both of them are simultaneously driven into the ground, so that the construction is easy and the construction period is shortened. You can In addition, when the sheet pile 1 is driven, the sheet pile 1, the casing 2 and the end face protection member 3 simultaneously perform soil stopping, closing and compaction of the surrounding ground, so that the strength against liquefaction of the ground can be increased. it can. In addition, groundwater flows into the drain member 5 to dissipate excess pore water pressure generated in the ground, and a strong sheet pile 1 is provided close to it to prevent liquefaction damage of various structures. You can
【0027】上記の実施形態では、矢板1の内面側にケ
ーシング2、端面保護部材3及び取付部材4を設けて、
ケーシング2内に1本又は2本のドレーン部材5を挿入
した場合を示したが、これら各部材は矢板1の外面側に
設けてもよく、あるいは内面側と外面側の両方に設けて
もよい。また、ドレーン部材5の数は適宜増減すること
ができる。さらに、図6及び図7に破線で示すように、
矢板1の種類、形状に応じて、適宜の場所に適宜数のド
レーン部材5を設けることができる。In the above embodiment, the casing 2, the end face protection member 3 and the mounting member 4 are provided on the inner surface side of the sheet pile 1,
Although the case where one or two drain members 5 are inserted into the casing 2 is shown, these respective members may be provided on the outer surface side of the sheet pile 1, or may be provided on both the inner surface side and the outer surface side. . Further, the number of drain members 5 can be appropriately increased or decreased. Further, as shown by the broken lines in FIGS. 6 and 7,
Depending on the type and shape of the sheet pile 1, an appropriate number of drain members 5 can be provided at appropriate locations.
【0028】実施例では、図1の装置の場合、矢板1の
長さ10.5m、ケーシング2の長さ約10m、ドレー
ン部材5の長さ約10mでその外径は55mmであっ
た。また、図5に示すように、ケーシング2として鋼管
23を使用した場合の鋼管23の外径は約140mm、
ドレーン部材5の外径は100mmであった。In the embodiment, in the case of the apparatus shown in FIG. 1, the sheet pile 1 has a length of 10.5 m, the casing 2 has a length of about 10 m, the drain member 5 has a length of about 10 m, and the outer diameter thereof is 55 mm. Further, as shown in FIG. 5, when the steel pipe 23 is used as the casing 2, the outer diameter of the steel pipe 23 is about 140 mm,
The outer diameter of the drain member 5 was 100 mm.
【0029】[0029]
【発明の効果】本発明に係る地盤の液状化防止装置は、
地盤に打設される矢板と、該矢板に取付けられる端面保
護部材と、筒状又はほぼU字状に形成され、先端部が前
記端面保護部材に着脱自在に連結されるケーシングと、
前記端面保護部材に嵌合されたケーシングを前記矢板と
ほぼ平行に保持する取付け部材と、吸水性又は透水性を
有し、前記ケーシング内又はケーシングと矢板の間に形
成された筒状部内に装入される棒状又は筒状のドレーン
部材とからなり、これらを一体化して地盤中に打設し、
ドレーン部材を地盤中に残置した状態でケーシングを引
抜くようにしたので、安価で施工が容易であり、工期を
短縮することができる。The ground liquefaction prevention apparatus according to the present invention comprises:
A sheet pile that is driven into the ground, an end face protection member that is attached to the sheet pile, a casing that is formed in a tubular shape or a substantially U shape, and has a tip end portion detachably connected to the end face protection member,
A mounting member that holds the casing fitted to the end face protection member substantially parallel to the sheet pile, and a member that has water absorbability or water permeability and is installed in the casing or a cylindrical portion formed between the casing and the sheet pile. It consists of a rod-shaped or cylindrical drain member to be inserted, and these are integrated and driven into the ground,
Since the casing is pulled out with the drain member left in the ground, the construction is inexpensive and the construction is easy, and the construction period can be shortened.
【0030】また、矢板の打設に際して、矢板及びこれ
と一体化されたケーシング、端面保護部材により、周囲
の地盤の土止め、締切り、締固めが並行して行われるの
で、地盤の耐液状化性を向上させることができる。さら
に、ドレーン部材に地下水を流入させて地盤中に発生す
る過剰間隙水圧を消散させると共に、これに近接して矢
板を設けたので、各種構造物の液状化被害を防止するこ
とができる。Further, at the time of driving the sheet pile, since the sheet pile, the casing integrated with the sheet pile, and the end face protection member simultaneously perform earth stopping, closing, and compaction of the surrounding ground, so that the ground is liquified. It is possible to improve the sex. Furthermore, since groundwater is caused to flow into the drain member to dissipate excess pore water pressure generated in the ground and a sheet pile is provided in the vicinity thereof, liquefaction damage to various structures can be prevented.
【図1】本発明の一実施形態の正面図及びそのA−A断
面図である。FIG. 1 is a front view of an embodiment of the present invention and a sectional view taken along line AA of FIG.
【図2】図1の分解斜視図である。FIG. 2 is an exploded perspective view of FIG.
【図3】図1のB−B、C−C、D−D拡大断面図であ
る。3 is an enlarged cross-sectional view of BB, CC, DD of FIG.
【図4】本発明の他の例の図3に相当する拡大断面図で
ある。FIG. 4 is an enlarged sectional view corresponding to FIG. 3 of another example of the present invention.
【図5】本発明の他の例の図3に相当する拡大断面図で
ある。FIG. 5 is an enlarged cross-sectional view of another example of the present invention, which corresponds to FIG.
【図6】図1の矢板の他の例の模式図である。FIG. 6 is a schematic view of another example of the sheet pile of FIG. 1;
【図7】図1の矢板の他の例の模式図である。FIG. 7 is a schematic view of another example of the sheet pile of FIG.
【図8】図1の端面保護部材及びドレーン部材の他の例
の正面図及び側面図である。FIG. 8 is a front view and a side view of another example of the end face protection member and the drain member of FIG.
1 矢板 2 ケーシング 3 端面保護部材 31 外面嵌合部 32 内面嵌合部 33 当接部 34 保持板 36 キャップ 37 フック 4 取付け部材 5 ドレーン部材 51 穴 52 フィルタ 1 Sheet Pile 2 Casing 3 End Face Protecting Member 31 Outer Surface Fitting Part 32 Inner Surface Fitting Part 33 Abutting Part 34 Holding Plate 36 Cap 37 Hook 4 Mounting Member 5 Drain Member 51 Hole 52 Filter
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中川 茂 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 (72)発明者 房前 貢 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 (72)発明者 森川 孝義 東京都千代田区内幸町2丁目2番3号 川 崎製鉄株式会社内 (72)発明者 岡 由剛 東京都千代田区内幸町2丁目2番3号 川 崎製鉄株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigeru Nakagawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (72) 1-2-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Tube Co., Ltd. (72) Inventor Takayoshi Morikawa 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Works (72) Inventor Yugo Oka 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Saki Steel Co., Ltd.
Claims (5)
部材に着脱自在に連結されるケーシングと、 前記端面保護部材に嵌合されたケーシングを前記矢板と
ほぼ平行に保持する取付け部材と、 吸水性又は透水性を有し、前記ケーシング内又はケーシ
ングと矢板の間に形成された筒状部内に装入される棒状
又は筒状のドレーン部材とからなる地盤の液状化防止装
置。1. A casing formed in the ground, an end face protection member attached to the sheet pile, and a casing formed in a tubular shape or a substantially U shape, and a tip portion of which is detachably connected to the end face protection member. And an attachment member for holding the casing fitted to the end face protection member substantially parallel to the sheet pile, and having a water absorbing property or a water permeability, in the casing or in a cylindrical portion formed between the casing and the sheet pile. Liquefaction prevention device for the ground, which comprises a rod-shaped or cylindrical drain member to be charged into the ground.
鋼、鋼管、矢板付き鋼管又はコンクリート杭の何れかで
ある請求項1記載の地盤の液状化防止装置。2. The ground liquefaction preventing device according to claim 1, wherein the sheet pile is any one of a steel sheet pile, an H-section steel, an H-section steel with a sheet pile, a steel pipe, a steel pipe with a sheet pile or a concrete pile.
合する内面嵌合部又はケーシングの外面に嵌合する外面
嵌合部の何れか一方又は両者を備えたものである請求項
1記載の地盤の液状化防止装置。3. The end surface protection member is provided with either one or both of an inner surface fitting portion fitted to the inner surface of the casing and an outer surface fitting portion fitted to the outer surface of the casing. Ground liquefaction prevention device.
ぼV字状の形鋼の何れかである請求項1記載の地盤の液
状化防止装置。4. The ground liquefaction prevention device according to claim 1, wherein the casing is one of a steel pipe and a substantially U-shaped or V-shaped steel.
穴あき耐圧管であり、地盤中において液状化現象の原因
となる過剰間隙水圧を低下させる機能を有するものであ
る請求項1記載の地盤の液状化防止装置。5. The ground according to claim 1, wherein the drain member is a perforated pressure resistant pipe made of synthetic resin or metal and has a function of lowering excess pore water pressure which causes a liquefaction phenomenon in the ground. Liquefaction prevention device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25265395A JP2881638B2 (en) | 1995-09-29 | 1995-09-29 | Soil liquefaction prevention device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25265395A JP2881638B2 (en) | 1995-09-29 | 1995-09-29 | Soil liquefaction prevention device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0995933A true JPH0995933A (en) | 1997-04-08 |
JP2881638B2 JP2881638B2 (en) | 1999-04-12 |
Family
ID=17240356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP25265395A Expired - Fee Related JP2881638B2 (en) | 1995-09-29 | 1995-09-29 | Soil liquefaction prevention device |
Country Status (1)
Country | Link |
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JP (1) | JP2881638B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011256592A (en) * | 2010-06-09 | 2011-12-22 | Sumitomo Metal Ind Ltd | Construction method for steel sheet pile with drainage function |
JP2012197653A (en) * | 2011-03-23 | 2012-10-18 | Sumitomo Metal Ind Ltd | Steel sheet pile with drainage function |
-
1995
- 1995-09-29 JP JP25265395A patent/JP2881638B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011256592A (en) * | 2010-06-09 | 2011-12-22 | Sumitomo Metal Ind Ltd | Construction method for steel sheet pile with drainage function |
JP2012197653A (en) * | 2011-03-23 | 2012-10-18 | Sumitomo Metal Ind Ltd | Steel sheet pile with drainage function |
Also Published As
Publication number | Publication date |
---|---|
JP2881638B2 (en) | 1999-04-12 |
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