JPH09158164A - Ground fluidization preventive method and water passing cylinder and burying method thereof - Google Patents
Ground fluidization preventive method and water passing cylinder and burying method thereofInfo
- Publication number
- JPH09158164A JPH09158164A JP34992895A JP34992895A JPH09158164A JP H09158164 A JPH09158164 A JP H09158164A JP 34992895 A JP34992895 A JP 34992895A JP 34992895 A JP34992895 A JP 34992895A JP H09158164 A JPH09158164 A JP H09158164A
- Authority
- JP
- Japan
- Prior art keywords
- water
- ground
- cone
- tip
- tip cone
- 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.)
- Pending
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Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、地震の際の地盤液状化
防止方法とそれに用いる通水筒及びその埋設方法につい
てのものであり、さらに詳しくは、地震の際に液状化し
やすい地盤に、通常は地下水を汲み上げないが、地震時
の振動により過剰間隙水が発生し地下水圧が上昇した
際、地下水が地表面に上昇できる通水路を有する通水筒
を地表面に対し垂直または斜め方向に埋設しておくこと
により、地震の際の地盤の液状化を防止する方法とその
ための特殊な構成からなる通水筒及びこの通水筒を地盤
中に埋設する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing ground liquefaction in the event of an earthquake and a water pipe used therefor and a method for burying it. Does not pump up groundwater, but when excessive pore water is generated due to vibration during an earthquake and groundwater pressure rises, a water pipe with a water passage that allows groundwater to rise to the ground surface is buried vertically or diagonally to the ground surface. The present invention relates to a method for preventing liquefaction of the ground in the event of an earthquake, a water pipe having a special structure for that purpose, and a method for burying this water pipe in the ground.
【０００２】[0002]
【従来技術】暗渠排水によって地中の水を排水すること
は良く知られており、そのためのプラスチックからなる
排水材料があり、各地で実施されている。しかし、この
様な暗渠排水設備では地表に近い地中の水を排水するだ
けで、地中の奥深い部分の地下水を排出するものではな
いし、ましてや地震の際に早期に地下水を地表に排出し
て地盤の液状化を防止できるものではなかった。そのた
め、地震の際に早期に地下水を地表に排出し、地盤の液
状化を防止するために、地盤に縦穴を掘りそこに砕石を
つめた砕石ドレーンを形成することにより地震時の振動
により生じる過剰間隙水を汲み上げることが行われてい
る。BACKGROUND ART It is well known that underground water is drained by underdrain drainage, and there is a drainage material made of plastic for that purpose, which is practiced in various places. However, such an underdrain drainage system does not discharge the groundwater deep inside the ground simply by draining the underground water close to the surface, let alone discharge the groundwater to the surface early in the event of an earthquake. It did not prevent the liquefaction of the ground. Therefore, in order to prevent groundwater liquefaction by discharging groundwater to the surface early in the event of an earthquake, by forming a crushed stone drain with vertical holes dug in the ground and crushed stones there, excessive vibration caused by the earthquake occurs. Pore water is pumped up.
【０００３】しかし従来の砕石ドレーンは、地震が起き
るまでの長い期間中に砕石ドレーンの石の間に土砂が詰
まり、いざ地震というときに十分な排水ができない状態
になっていることが多かった。そのため定期的に石を堀
り出し、石の間に溜まった土砂を除去し埋め戻すという
メンテナンスが必要だったし、メンテナンスの直前に地
震が起きると、目詰まりのため地下水の排水速度が遅
く、十分な液状化防止が出来なかった。However, in the conventional crushed stone drain, it was often the case that during the long period until an earthquake occurred, the stones in the crushed stone drain were clogged with earth and sand, and in the event of an earthquake, sufficient drainage was not possible. Therefore, it was necessary to regularly excavate the stone, remove the soil accumulated between the stones and backfill it, and if an earthquake occurs just before the maintenance, the drainage rate of groundwater will be slow due to clogging, It was not possible to prevent sufficient liquefaction.
【０００４】[0004]
【解決すべき課題】そこで本発明では、設置のための工
事が簡単で、通常時には土砂による目詰まりによるメン
テナンスの必要がなく、しかも地震時には大量の地下水
を素早く地上に排水でき、地盤の液状化を確実に防止で
きるような地盤の液状化防止方法、そのための通水筒及
びそれを地盤中に埋設するための埋設方法を開発するこ
とが解決すべき課題である。Therefore, in the present invention, construction for installation is simple, there is no need for maintenance due to clogging with earth and sand during normal times, and a large amount of groundwater can be quickly drained to the ground during an earthquake, and the ground is liquefied. The problem to be solved is to develop a method for preventing the liquefaction of the ground that can reliably prevent the above, a water pipe for that purpose, and an embedding method for burying it in the ground.
【０００５】[0005]
【解決するための手段】本発明では上記課題を解決する
ために、先端に金属やプラスチックのような堅い物質で
形成された先端コーンがあり、該コーンの後方に、多数
の入水口が設けられており、該入水口に連通して地表方
向に通水路が形成されている地震などの地殼変動によっ
ても押し潰されたり折れ曲がったりしない程度の剛性を
有する筒状体であって、該通水路は毛細管現象を起こさ
ない程度に大きい断面積を有するものである通水筒と、
その筒の外周を覆う透水シートとが設けられている地盤
液状化防止のための先端コーン付き透過通水筒を、地震
の際に液状化しやすい地盤中に適宜間隔で地表面に対し
垂直又は斜め方向に埋設したことを特徴とする地盤液状
化防止方法を開発した。In order to solve the above problems, the present invention provides a tip cone formed at the tip with a hard material such as metal or plastic, and a large number of water inlets are provided behind the cone. It is a tubular body having rigidity that does not crush or bend due to a change in the ground such as an earthquake in which a water passage is formed in the surface direction in communication with the water inlet, and the water passage is A water tube having a large cross-sectional area that does not cause a capillary phenomenon,
A permeation pipe with a tip cone for preventing ground liquefaction, which is provided with a water permeable sheet that covers the outer circumference of the cylinder, is installed in the ground that is easily liquefied in the event of an earthquake at a proper interval in the vertical or diagonal direction to the ground surface. We have developed a ground liquefaction prevention method characterized by being buried in
【０００６】また本発明ではそのための通水筒として、
地盤に埋設され、地震の際に地盤が液状化する前に地下
水を地上に逃がす通路となるものであって、先端に金属
やプラスチックのような堅い物質で形成された先端コー
ンがあり、該コーンの後方に、多数の入水口が設けられ
ており、該入水口に連通して地表方向に通水路が形成さ
れている地震などの地殼変動によっても押し潰されたり
折れ曲がったりしない程度の剛性を有する筒状体であっ
て、該通水路は毛細管現象を起こさない程度に大きい断
面積を有するものである通水筒と、その筒の外周を覆う
透水シートとが設けられている地盤液状化防止のための
先端コーン付き透過通水筒を開発した。Further, in the present invention, as a water pipe for that purpose,
It is buried in the ground and serves as a passage for groundwater to escape to the ground before the ground liquefies in the event of an earthquake, and there is a tip cone formed of a hard material such as metal or plastic at the tip. A large number of water inlets are provided in the rear of the, and a water passage is formed in communication with the water inlets in the direction of the surface of the earth. It has a rigidity that does not cause it to be crushed or bent due to changes in the ground such as an earthquake. In order to prevent ground liquefaction, the water passage is a tubular body, and the water passage has a large cross-sectional area that does not cause a capillary phenomenon, and a water-permeable sheet that covers the outer circumference of the pipe. Has developed a permeation tube with a tip cone.
【０００７】さらに本発明では、地震の際に地盤が液状
化する前に地下水を地上に逃がす通路となるものであっ
て、先端に金属やプラスチックのような堅い物質で形成
された先端コーンがあり、該コーンの後方に、多数の入
水口が設けられており、該入水口に連通して地表方向に
通水路が形成されている地震などの地殻変動によっても
押し漬されたり折れ曲がったりしない程度の剛性を有す
る筒状体であって、該通水路は毛細管現象を起こさない
程度に大きい断面積を有するものである通水筒と、その
筒の外周を覆う透水シートとが設けられている先端コー
ン付き透過通水筒を地中に埋設する際に、（ａ）前記透
水シートの外側を保護筒で覆い、（ｂ）保護筒で覆われ
た先端コーン付き透過通水筒を、先端コーンを先にして
振動機、チャックハンマー等の打込機によって地中に挿
入し、（ｃ）挿入後、上記保護筒を抜き去ることを特徴
とする地盤液状化防止のための先端コーン付き透過通水
筒の埋設方法と、それとは別の埋設方法として、あらか
じめ地盤に穴を掘っておき、そこに先端コーン付き透過
通水筒を埋設する方法を開発した。Further, according to the present invention, there is provided a tip cone which is made of a hard material such as metal or plastic at the tip, which serves as a passage for releasing groundwater to the ground before the ground is liquefied in the event of an earthquake. , A number of water inlets are provided at the rear of the cone, and a water passage is formed in the direction of the surface of the earth that communicates with the water inlets, so that it is not submerged or bent by crustal movements such as an earthquake. With a tip cone provided with a rigid tubular body, the water passage having a cross-sectional area large enough not to cause a capillary phenomenon, and a water permeable sheet covering the outer circumference of the tube. When the permeation water pipe is buried in the ground, (a) the outside of the water-permeable sheet is covered with a protection pipe, and (b) the permeation water pipe with a tip cone covered with the protection pipe vibrates with the tip cone first. Machine, chuck A method for burying a permeation water pipe with a tip cone for preventing ground liquefaction, which is characterized in that the protection cylinder is removed by inserting it into the ground with a hammer or the like, and (c) inserting it, and what is it? As another burying method, we developed a method of digging a hole in the ground in advance and burying a permeate water pipe with a tip cone in it.
【０００８】[0008]
【実施例】図１と図２、図３と図４、および図５と図６
は、いずれも請求項２記載の発明である先端コーン付き
透過通水筒の実施例を示すものであるが、この先端コー
ン付き透過通水筒は請求項１、３及び４の発明でも用い
られる。図１と図２は、その先端コーン付き透過通水筒
の第１実施例を示すもので、地震時の過剰間隙水を地表
に上昇させる通水筒として内部に補強体がある筒体を用
いたものを示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2, FIGS. 3 and 4, and FIGS.
Shows an embodiment of a permeation water pipe with a tip cone, which is the invention of claim 2, and this permeation water pipe with a tip cone is also used in the inventions of claims 1, 3 and 4. FIG. 1 and FIG. 2 show a first embodiment of the permeation water pipe with a tip cone, in which a tubular body having a reinforcing body inside is used as a water pipe for raising excess pore water at the time of an earthquake to the ground surface. Is shown.
【０００９】図１はその縦断面図であり、図２は図１に
おけるＡ−Ａ断面図である。これらの図において、１が
先端コーン付き透過通水筒であって、２は先端コーンで
ある。この先端コーン２は、金属やプラスチックなどの
堅い物質から出来ており、その形状は、先の尖った円錐
または角錐などの錐形または半円球をしたものが良く、
後端には、最大径になっている後端部３がある。しか
し、土質によっては先端が平らな円盤や板状物でも良
い。FIG. 1 is a vertical sectional view thereof, and FIG. 2 is a sectional view taken along line AA in FIG. In these figures, 1 is a permeation water pipe with a tip cone, and 2 is a tip cone. The tip cone 2 is made of a hard material such as metal or plastic, and its shape is preferably a cone having a pointed cone or a pyramid, or a semi-spherical shape,
At the rear end, there is a rear end portion 3 having the largest diameter. However, depending on the soil quality, a disk or plate with a flat tip may be used.
【００１０】先端コーンの後方には通水筒４が設けられ
ており、この通水筒４は硬質のプラスチック又は金属で
形成されている。そしてそれは円筒形をしており、該円
筒には全面に渡って内外に通じた多数の入水口５があ
り、その入水口５に連なって通水路６が形成されてお
り、この通水路６は通水筒４の軸方向に全長に渡って伸
びており、後端（図において右側）で即ちそれが埋設さ
れたときに地表面に接するところで開口している。この
通水筒４は地震などの地殻変動によっても押し潰された
り折れ曲がったりしない程度の剛性を有する筒状体であ
って、中心部に向かって補強体７がある。この通水筒４
は、先端コーンに連結されており、その外周面は透水シ
ート８で覆われている。A water pipe 4 is provided behind the tip cone, and the water pipe 4 is made of hard plastic or metal. And, it has a cylindrical shape, the cylinder has a large number of water inlets 5 communicating with the inside and the outside over the entire surface, and a water passage 6 is formed in connection with the water inlet 5 and this water passage 6 is It extends over the entire length in the axial direction of the water pipe 4 and opens at the rear end (right side in the figure), that is, where it comes into contact with the ground surface when it is buried. The water passage 4 is a tubular body having rigidity such that it is not crushed or bent due to crustal movements such as an earthquake, and has a reinforcing body 7 toward the center. This water pipe 4
Is connected to the tip cone, and the outer peripheral surface thereof is covered with the water permeable sheet 8.
【００１１】そして、この透水シート８も先端コーン２
に連結されている。しかし、通水筒４および透水シート
８の先端コーン２への連結は、いずれか一方でも良く、
また一方か先端コーン２に連結されているとき他方はそ
れに連結されていても良い。また、先端コーン２の後方
には、先端コーン付き透過通水筒１の挿入の際に使用さ
れる管または棒状の操作棒１１が連結されていてもよ
い。The water permeable sheet 8 is also used in the tip cone 2
It is connected to. However, either one of the water pipe 4 and the water permeable sheet 8 may be connected to the tip cone 2,
Also, when one is connected to the tip cone 2, the other may be connected to it. Further, behind the tip cone 2, a pipe-shaped or rod-shaped operation rod 11 used when inserting the permeation water cylinder 1 with the tip cone may be connected.
【００１２】図３と図４は、地震時に地下水を地表に排
水するための通水筒としてプラスチックの線状物を蛇行
させて互いに絡み合わせ筒状にしたものを用いた実施例
２で、図３はその縦断面図であり、図４は、図３におけ
るＢ−Ｂ断面図である。これらの図において、１は先端
コーン付き透過通水筒で、２は先端コーンであって、こ
れは実施例１と変わらない。その後方には複数本のプラ
スチックの線状物を蛇行させて互いに絡み合わせ筒状に
した通水筒１４が設けられている。この通水筒１４の各
線状物は緩く絡み合っているので空隙部が多くあり、そ
の外周面には全面に渡って多数開口がありそれが入水口
１５となる。FIG. 3 and FIG. 4 show a second embodiment in which a plastic pipe is meandered and entangled with each other to form a water pipe for draining groundwater to the surface during an earthquake. Is a vertical sectional view thereof, and FIG. 4 is a BB sectional view in FIG. In these figures, 1 is a permeation water tube with a tip cone, and 2 is a tip cone, which is the same as in the first embodiment. A water passage tube 14 is provided behind the water passage tube 14 in which a plurality of plastic linear objects are meandered and intertwined with each other to form a tubular shape. Since the linear objects of the water pipe 14 are loosely entangled with each other, there are many voids, and the outer peripheral surface thereof has a large number of openings which serve as the water inlet 15.
【００１３】そして、内部の空隙部は全長にわたり蛇行
しながら連続して後端（図において右側）まで伸びてお
り、これが通水路１６を形成する。この通水筒１４は地
震などの地殻変動によっても押し潰されたり折れ曲がっ
たりしない程度の剛性を有する筒状体である。これらの
通水路１６は、毛細管現象を起こさない程度に大きい断
面積を有するものであり、地震以外のときは地下水が汲
み上げられることはない。そして地震で地下の水圧が高
まったときには、十分の量の地下水を地表に逃がすこと
が出来る程度に大きい。The internal void portion extends continuously along the entire length while meandering to the rear end (on the right side in the figure), which forms the water passage 16. The water pipe 14 is a tubular body having a rigidity such that it is not crushed or bent due to a crustal movement such as an earthquake. These water passages 16 have a large cross-sectional area that does not cause a capillary phenomenon, and groundwater is not pumped up except for an earthquake. And when the groundwater pressure rises due to an earthquake, it is large enough to allow enough groundwater to escape to the surface.
【００１４】また、通水筒１４の外周には透水シート８
があり、これにより、通常時においても地震時において
も通水筒１４内に水だけを通して土砂を入り込ませな
い。したがって、通水路１６は土砂による目詰まりがな
く、地震時にも、振動により生じる間隙水を地盤が液状
化する前に素早く地表に排水できるし、土砂が地表面に
噴出することもない。なお通常時は通水筒１４内に透水
シート８を通して水だけが入ってくるが、地下水の水位
以上には上昇しない。さらに、先端コーン２の後方に
は、先端コーン付き透過通水筒１の挿入の際に使用する
管または棒状の操作棒１１が連結されていてもよい。そ
して、通水筒１４、透水シート８のいずれか一方または
両方が先端コーン２に連結されている。A water-permeable sheet 8 is provided on the outer circumference of the water pipe 14.
As a result, the sand is prevented from entering through the water pipe 14 only during normal times and earthquakes. Therefore, the water passage 16 is not clogged with earth and sand, and even during an earthquake, pore water generated by vibration can be quickly drained to the ground surface before the ground is liquefied, and earth and sand will not be jetted to the ground surface. Normally, only water enters the water passage 14 through the water permeable sheet 8, but does not rise above the groundwater level. Further, a pipe or a rod-shaped operation rod 11 used when inserting the permeation water cylinder 1 with the tip cone may be connected to the rear of the tip cone 2. Either or both of the water passage cylinder 14 and the water permeable sheet 8 are connected to the tip cone 2.
【００１５】次ぎに、図５と図６は、地震時に地下水を
地表に排水するための先端コーン付き透過通水筒１とし
てプラスチックからなる補強筒体を用いた別の実施例を
示すもので、図５はその一部破断図である。この補強筒
体は、４種類の異なる構成を有する４種類の短筒、即ち
引出線▲イ▼、▲ロ▼、▲ハ▼、▲ニ▼、で示すものを
継ぎ合わせたものを一単位として、その単位が繰り返し
連結されているものである。そして、この一単位の４種
類の短筒の各構成は図６に示されており、図５における
引出線▲イ▼、▲ロ▼、▲ハ▼、▲ニ▼、における各断
面図を図６の▲イ▼、▲ロ▼、▲ハ▼、▲ニ▼、に対応
させて示してある。Next, FIGS. 5 and 6 show another embodiment in which a reinforced cylindrical body made of plastic is used as the permeate water cylinder 1 with a tip cone for draining groundwater to the surface during an earthquake. 5 is a partially cutaway view thereof. This reinforcing cylinder is made up of four types of short cylinders having four different configurations, that is, a unit obtained by joining together the ones indicated by the leader lines (a), (b), (c), and (d). , That unit is repeatedly connected. Each structure of the four types of short cylinders in one unit is shown in FIG. 6, and the cross-sectional views taken along the leader lines (a), (b), (c) and (d) in FIG. 5 are shown. It is shown in correspondence with 6 (a), (b), (c), and (d).
【００１６】これらの図において、１は先端コーン付き
透過通水筒であり、２は先端コーン、３はその後端部で
あって、先の例で述べたものと変わらない。２４は通水
筒であって、各部分の断面は図６に示すように４種類の
形状を有するプラスチック補強筒体からなっている。ま
た２５は入水口であり、通水筒２４の全周に渡り多数設
けられており、この入水口２５に連通して通水路２６が
設けられている。２７は通水筒２４を補強するための補
強体であり、全長に渡って通水路２６が形成され地下水
が地上に排水されるのを妨げないように形成されてい
る。そして、この通水筒２４の外周には透水シート８が
ある。In these drawings, 1 is a permeation water pipe with a tip cone, 2 is a tip cone, and 3 is a rear end thereof, which are the same as those described in the previous example. Reference numeral 24 is a water passage cylinder, and the cross section of each portion is made of a plastic reinforced cylinder body having four types of shapes as shown in FIG. Further, 25 is a water inlet, which is provided in a large number all around the water passage 24, and a water passage 26 is provided in communication with the water inlet 25. Reference numeral 27 is a reinforcing body for reinforcing the water pipe 24, and the water passage 26 is formed over the entire length so as not to prevent groundwater from being discharged to the ground. The water permeable sheet 8 is provided on the outer periphery of the water passage cylinder 24.
【００１７】また、これら実施例１、２および３におい
て、先端コーン２の最大外形である後端縁３は、図１、
図３並びに図５からも明らかなように通水筒４、１４、
並びに２４さらには透水シート８の最大外径より大きく
なっており、それには重要な意味がある。というのは、
先端コーン付き透過通水筒１を地盤に開けた穴に挿入す
る際には、図７に示すように、先端コーン付き透過通水
筒１を損傷させないようにするために、図１や図２に示
した先端コーン付き透過通水筒１の外周に保護筒９を差
し込んだ後、予め掘られている穴１０に挿入する。この
とき保護筒９が先端コーン２の後端縁３より外に出てい
ると、保護筒９が穴１０の内壁との摩擦により抜け、保
護の役目を果たさなくなるからである。Further, in these Examples 1, 2 and 3, the rear end edge 3 which is the maximum outer shape of the tip cone 2 is shown in FIG.
As is clear from FIGS. 3 and 5, the water passages 4, 14,
In addition, it is larger than the maximum outer diameter of the water-permeable sheet 8 and has an important meaning. I mean,
As shown in FIG. 7, when the permeated water cylinder 1 with the tip cone is inserted into the hole opened in the ground, the permeated water cylinder 1 with the tip cone is shown in FIGS. 1 and 2 so as not to damage it. After inserting the protective cylinder 9 on the outer periphery of the permeation water cylinder 1 with the tip cone, the protective cylinder 9 is inserted into the previously dug hole 10. At this time, if the protective cylinder 9 is out of the rear end edge 3 of the tip cone 2, the protective cylinder 9 will come off due to friction with the inner wall of the hole 10, and the protective cylinder 9 will no longer fulfill its protective role.
【００１８】図７は、実施例１〜３に示した先端コーン
付き透過通水筒１を予め地盤に掘った穴１０に挿入した
ときの状態を示す図で、上記例に示した先端コーン付き
透過通水筒１を損傷させないようにするために、挿入に
先だって、その外周に保護筒９を差し込み、透水シート
を保護した状態で自重またはチャックハンマなどで加重
を掛けて、予め掘られている穴１０に挿入する。そのた
め、先端コーン２の後端縁３は、保護筒９を差し込んだ
状態においてもなお、保護筒９の外周より外側に張り出
している。FIG. 7 is a view showing a state in which the permeation water tube 1 with a tip cone shown in Examples 1 to 3 is inserted into a hole 10 dug in the ground in advance, and the permeation with a tip cone shown in the above example is shown. In order to prevent the water passage cylinder 1 from being damaged, a protection cylinder 9 is inserted into the outer periphery of the water passage cylinder 1 prior to the insertion, and the water permeation sheet is protected by applying a weight thereof with its own weight or a chuck hammer or the like, and a pre-drilled hole 10 To insert. Therefore, the rear end edge 3 of the tip cone 2 still projects to the outside of the outer circumference of the protective cylinder 9 even when the protective cylinder 9 is inserted.
【００１９】先端コーン付き透過通水筒１を穴１０に挿
入した後は、保護筒９を穴から抜き取らねばならない
が、このとき先端コーン付き透過通水筒１も一緒に上昇
してしまうことがある。先端コーン２の後端縁３はこれ
を防ぐ楔状の役割を果たし、後端縁３が周囲の土に引っ
掛かり、先端コーン付き透過通水筒１の上昇を防ぐ。そ
れでも不十分なときは、先端コーン２の先を地中に打ち
込んだ後、保護筒９を引き上げれば良い。After the permeation water tube 1 with the tip cone is inserted into the hole 10, the protection tube 9 must be pulled out from the hole, but at this time, the permeation water tube 1 with the tip cone may also rise together. The rear end edge 3 of the front cone 2 plays a wedge-shaped role to prevent this, and the rear end edge 3 is caught in the surrounding soil and prevents the permeation water cylinder 1 with the front cone from rising. If it is still insufficient, the tip of the tip cone 2 may be driven into the ground, and then the protective cylinder 9 may be pulled up.
【００２０】図８は、先端コーン付き透過通水筒１が地
盤中に埋設された状態を示すものでる。この状態は、図
７の状態から保護筒９を地上に引き抜き、穴１０内には
先端コーン付き透過通水筒１が残され、地表面３０の先
端コーン付き透過通水筒１の上に流水層３１を形成し、
その上に舗装層３２を形成した状態を示すものである。
そして、上記流水層３１は、側溝３３などの排水路に繋
がっている。FIG. 8 shows a state in which the permeation water pipe 1 with a tip cone is embedded in the ground. In this state, the protective cylinder 9 is pulled out to the ground from the state of FIG. 7, the permeation water pipe 1 with the tip cone is left in the hole 10, and the water flow layer 31 is formed on the permeation water pipe 1 with the tip cone on the ground surface 30. To form
It shows a state in which a pavement layer 32 is formed on the pavement layer 32.
The flowing water layer 31 is connected to drainage channels such as the gutters 33.
【００２１】この様になっているため、地震により地下
の間隙水圧が上昇したとき、間隙水は先端コーン付き透
過通水筒１の入水口５、１５、２５より通水路６、１
６、２６を通って地表に排水される。このため、地下水
の間隙水圧が低下し、地盤強度が弱い亀裂などから土砂
が地下水と一緒に地表に噴出することはない。これによ
って、地震時の地盤の液状化を防止できる。Due to this, when the underground pore water pressure rises due to an earthquake, the pore water flows from the water inlets 5, 15, 25 of the permeate water cylinder 1 with the tip cone to the water channels 6, 1, 25.
It drains to the surface through 6, 26. For this reason, the pore water pressure of the groundwater decreases, and the sediment does not erupt along with the groundwater to the surface of the ground due to a crack having a low ground strength. Thereby, liquefaction of the ground at the time of an earthquake can be prevented.
【００２２】[0022]
【効果】請求項１の発明によれば、次のような効果が得
られる。 １、簡単な構造の先端コーン付き透過通水筒を埋設する
だけで、確実に地震時の地盤の液状化を防止できる。 ２、先端コーン付き透過通水筒を埋設した後のメンテナ
ンスが要らないので、維持管理が容易であり、地震時に
土砂の地表への噴出がない、確実に液状化を防止できる
地盤が得られる。According to the first aspect of the invention, the following effects can be obtained. 1. The liquefaction of the ground during an earthquake can be reliably prevented only by embedding a permeated water passage with a simple cone having a tip cone. 2. Since maintenance is not required after burying the permeation water tube with a cone at the tip, maintenance is easy, and there is no jet of earth and sand to the surface of the earth during an earthquake, and the ground that can reliably prevent liquefaction can be obtained.
【００２３】請求項２の発明によれば、次ぎの効果がえ
られる。 １、先端コーン付き透過通水筒の構造が簡単であり、制
作が容易である。 ２、先端コーン付き透過通水筒の構造は先端が尖った柱
状であるから、地盤への進入が容易である。 ３、先端コーン付き透過通水筒の通水路の断面積が大き
く、毛細管現象による地下水の上昇がなく、地震時以外
のとき不必要に地下水を汲み上げないし、地震時には短
時間で地下水を排水できるので、確実に地震時の地盤の
液状化を防止できる。According to the invention of claim 2, the following effects can be obtained. 1. The structure of the permeation water pipe with the cone at the tip is simple and easy to produce. 2. Since the structure of the permeation water pipe with the tip cone is a column with a sharp tip, it is easy to enter the ground. 3, the cross-sectional area of the water passage of the permeate water cylinder with a tip cone is large, there is no rise of groundwater due to the capillary phenomenon, it does not unnecessarily pump groundwater except during an earthquake, and it can drain groundwater in a short time during an earthquake, It is possible to reliably prevent liquefaction of the ground during an earthquake.
【００２４】４、先端コーン付き透過通水筒は補強体が
あるなど強固であり、地震時にも押し潰されたり曲げら
れたりしない。 ５、透水シートがあるので、通水筒の中に土砂が入らな
いし、地下水と一緒に土砂が地表に排出されない。この
ため地盤の崩壊が起きない。 ６、先端コーン付き透過通水筒は、全体がプラスチック
またはほとんどがプラスチックであり一部のみが金属
（この部分は腐食しても地震時の地下水排出には関係な
い）であるから耐久性がある。4. The permeation pipe with a cone is strong because it has a reinforcing body and is not crushed or bent even during an earthquake. 5. Because there is a water permeable sheet, sediment does not enter the water pipe and sediment is not discharged to the ground with groundwater. As a result, the ground does not collapse. 6. The permeation pipe with a tip cone is durable because it is entirely plastic or mostly plastic and only part is metal (corrosion of this part is not related to groundwater discharge during an earthquake).
【００２５】請求項３、４の発明によれば、次ぎの効果
がえられる。 １、地盤に進入しやすい形状をしている先端コーン付き
透過通水筒を、適宜間隔で地表面に対し垂直又は斜め方
向に自重又は打込機で打ち込むだけで良いから、簡単な
工事で液状化を防止できる地盤が得られる。 ２、地震時の地下水の排水路となる先端コーン付き透過
通水筒を、埋め込み時の損傷を無くして簡単に埋設でき
る。 ３、埋め込みに際し、特別な機械や装置が要らない。 ４、簡単な工法であるから、トラブルが少なく、効率が
良い。According to the inventions of claims 3 and 4, the following effects can be obtained. 1. The permeable liquefaction tube with a tip cone, which has a shape that makes it easy to enter the ground, can be liquefied by a simple construction because it can be driven by its own weight or a driving machine vertically or diagonally to the ground surface at appropriate intervals. The ground which can prevent is obtained. 2. The permeate water pipe with a tip cone, which serves as a drainage channel for groundwater in the event of an earthquake, can be easily buried without damaging it when buried. 3. No special machine or device is required for embedding. 4. Since it is a simple construction method, there are few troubles and efficiency is good.
【図１】本願発明の先端コーン付き透過通水筒の第１実
施例を示す一部を切断した縦断面図である。FIG. 1 is a vertical cross-sectional view with a part cut showing a first embodiment of a permeation water pipe with a tip cone of the present invention.
【図２】図１におけるＡ−Ａ線での断面図である。FIG. 2 is a sectional view taken along line AA in FIG.
【図３】本願発明の先端コーン付き透過通水筒の第２実
施例を示す一部を切断した縦断面図である。FIG. 3 is a vertical cross-sectional view with a part cut showing a second embodiment of the permeation water pipe with a cone of the present invention.
【図４】図３におけるＢ−Ｂ線での断面図である。FIG. 4 is a sectional view taken along line BB in FIG.
【図５】本願発明の先端コーン付き透過通水筒の第３実
施例を示す一部を切断した側面図である。FIG. 5 is a partially cut side view showing a third embodiment of the permeation water pipe with a tip cone of the present invention.
【図６】図５における各引き出し線の位置での断面図で
ある。6 is a cross-sectional view at the position of each lead line in FIG.
【図７】本願発明の先端コーン付き透過通水筒に保護筒
を被せて、地盤中に予め掘った穴に挿入したときの地盤
中における断面図である。FIG. 7 is a cross-sectional view in the ground when the permeation water-carrying cylinder with a tip cone of the present invention is covered with a protective cylinder and inserted into a hole dug in the ground in advance.
【図８】図７の状態から保護筒を抜き去った後の状態、
即ち、本願発明の先端コーン付き透過通水筒を地中に埋
設した状態を示すものである。FIG. 8 shows a state after the protective tube is removed from the state of FIG. 7,
In other words, this shows a state in which the permeated water pipe with the tip cone of the present invention is buried underground.
１・・・先端コーン付き透過通水筒 ２・・・先端コーン ４、１４、２４・・・通水筒 ５、１５、２５・・・入水口 ６、１６、２６・・・通水路 ８・・・透水シート ９・・・保護筒 1 ... Permeable water pipe with tip cone 2 ... Tip cone 4, 14, 24 ... Water pipe 5, 15, 25 ... Water inlet 6, 16, 26 ... Water passage 8 ... Water-permeable sheet 9 ... Protective tube
Claims (4)
物質で形成された先端コーンがあり、該コーンの後方
に、多数の入水口が設けられており、該入水口に連通し
て地表方向に通水路が形成されている地震などの地殼変
動によっても押し漬されたり折れ曲がったりしない程度
の剛性を有する筒状体であって、該通水路は毛細管現象
を起こさない程度に大きい断面積を有するものである通
水筒と、その筒の外周を覆う透水シートとが設けられて
いる地盤液状化防止のための先端コーン付き透過通水筒
を、地震の際に液状化しやすい地盤中に適宜間隔で地表
面に対し垂直又は斜め方向に埋設したことを特徴とする
地盤液状化防止方法。1. A tip cone formed of a hard material such as metal or plastic at the tip, and a large number of water inlets are provided behind the cone, and the water is communicated with the water inlet to extend toward the ground surface. A cylindrical body having a rigidity that is not squeezed or bent even when the water channel is formed, such as an earthquake, or the like, and the water channel has a large cross-sectional area that does not cause a capillary phenomenon. The permeation pipe with a tip cone for preventing liquefaction of the ground, which is provided with a water pipe and a water permeable sheet that covers the outer circumference of the pipe, is installed on the ground surface at appropriate intervals in the ground that is easily liquefied in the event of an earthquake. The method for preventing ground liquefaction is characterized in that it is buried vertically or obliquely with respect to.
化する前に地下水を地上に逃がす通路となるものであっ
て、先端に金属やプラスチックのような堅い物質で形成
された先端コーンがあり、該コーンの後方に、多数の入
水口が設けられており、該入水口に連通して地表方向に
通水路が形成されている地震などの地殼変動によっても
押し潰されたり折れ曲がったりしない程度の剛性を有す
る筒状体であって、該通水路は毛細管現象を起こさない
程度に大きい断面積を有するものである通水筒と、その
筒の外周を覆う透水シートとが設けられている地盤液状
化防止のための先端コーン付き透過通水筒。2. A tip cone that is buried in the ground and serves as a passage for releasing groundwater to the ground before the ground liquefies in the event of an earthquake, and has a tip made of a hard substance such as metal or plastic. There is a large number of water inlets behind the cone, and a water passage is formed in the direction of the surface of the ground that communicates with the water inlets, so that it will not be crushed or bent even by a change in the ground such as an earthquake. A ground body having a cylindrical body having a certain degree of rigidity, the water passage having a cross-sectional area large enough not to cause a capillary phenomenon, and a water-permeable sheet covering the outer circumference of the cylinder. Permeate water cylinder with tip cone to prevent liquefaction.
を地上に逃がす通路となるものであって、先端に金属や
プラスチックのような堅い物質で形成された先端コーン
があり、該コーンの後方に、多数の入水口が設けられて
おり、該入水口に連通して地表方向に通水路が形成され
ている地震などの地殻変動によっても押し潰されたり折
れ曲がったりしない程度の剛性を有する筒状体であっ
て、該通水路は毛細管現象を起こさない程度に大きい断
面積を有するものである通水筒と、その筒の外周を覆う
透水シートとが設けられている先端コーン付き透過通水
筒を地中に埋設する際に、（ａ）前記透水シートの外側
を保護筒で覆い、（ｂ）保護筒で覆われた先端コーン付
き透過通水筒を、先端コーンを先にして振動機、チャッ
クハンマー等の打込機によって地中に挿入し、（ｃ）挿
入後、上記保護筒を抜き去ることを特徴とする地盤液状
化防止のための先端コーン付き透過通水筒の埋設方法。3. A cone that is a passage for releasing groundwater to the ground before the ground liquefies in the event of an earthquake, and has a tip cone formed of a hard substance such as metal or plastic at the tip. Has a large number of water inlets behind it and has a rigidity that does not crush or bend due to crustal movements such as earthquakes in which a water passage is formed in communication with the water inlets in the direction of the surface of the earth. Permeable water pipe with a tip cone, which is a tubular body, in which the water passage has a large cross-sectional area that does not cause a capillary phenomenon and a water permeable sheet that covers the outer circumference of the pipe. When burying in the ground, (a) the outer side of the water-permeable sheet is covered with a protective tube, and (b) the permeation water tube with a tip cone covered with the protective tube is attached to the vibrator, chuck with the tip cone first. Driving machine such as hammer The method for burying a permeation water pipe with a tip cone for preventing ground liquefaction, characterized in that the protective cylinder is removed after being inserted into the ground by (c).
を地上に逃がす通路となるものであって、先端に金属や
プラスチックのような堅い物質で形成された先端コーン
があり、該コーンの後方に、多数の入水口が設けられて
おり、該入水口に連通して地表方向に通水路が形成され
ている地震などの地殻変動によっても押し潰されたり折
れ曲がったりしない程度の剛性を有する筒状体であっ
て、該通水路は毛細管現象を起こさない程度に大きい断
面積を有するものである通水筒と、その筒の外周を覆う
透水シートとが設けられている先端コーン付き透過通水
筒を地中に埋設する際に、（ａ）前記先端コーンの最大
外形と同じかそれより僅かに大きい穴を、地表面に対し
垂直または斜め方向に堀り、（ｂ）該穴に、前記先端コ
ーン付き透過通水筒をそのまま又はその透水シートの外
側を保護筒で覆い、自重で又は打込機によって挿入し、
（ｃ）挿入後、前記保護筒がある場合にはその保護筒を
抜き去ることを特徴とする地盤液状化防止のための先端
コーン付き透過通水筒の埋設方法。4. A channel that allows groundwater to escape to the ground before the ground liquefies in the event of an earthquake, and has a tip cone formed of a hard substance such as metal or plastic at the tip. Has a large number of water inlets behind it and has a rigidity that does not crush or bend due to crustal movements such as earthquakes in which a water passage is formed in communication with the water inlets in the direction of the surface of the earth. Permeable water pipe with a tip cone, which is a tubular body, in which the water passage has a large cross-sectional area that does not cause a capillary phenomenon and a water permeable sheet that covers the outer circumference of the pipe. (A) a hole that is the same as or slightly larger than the maximum outer shape of the tip cone is dug vertically or obliquely with respect to the ground surface, and (b) the tip is inserted into the hole. With a permeation tube with cone As it is or by covering the outside of the water-permeable sheet with a protective tube, insert it by its own weight or by a driving machine,
(C) A method for burying a permeation water pipe with a tip cone for preventing ground liquefaction, characterized in that if there is the protective cylinder after insertion, the protective cylinder is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34992895A JPH09158164A (en) | 1995-12-13 | 1995-12-13 | Ground fluidization preventive method and water passing cylinder and burying method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34992895A JPH09158164A (en) | 1995-12-13 | 1995-12-13 | Ground fluidization preventive method and water passing cylinder and burying method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09158164A true JPH09158164A (en) | 1997-06-17 |
Family
ID=18407063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34992895A Pending JPH09158164A (en) | 1995-12-13 | 1995-12-13 | Ground fluidization preventive method and water passing cylinder and burying method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09158164A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013217144A (en) * | 2012-04-11 | 2013-10-24 | Shimizu Corp | Sand boil prevention structure |
-
1995
- 1995-12-13 JP JP34992895A patent/JPH09158164A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013217144A (en) * | 2012-04-11 | 2013-10-24 | Shimizu Corp | Sand boil prevention structure |
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