JP2756836B2 - Backfill method of earth and sand when pulling sheet pile - Google Patents
Backfill method of earth and sand when pulling sheet pileInfo
- Publication number
- JP2756836B2 JP2756836B2 JP20408789A JP20408789A JP2756836B2 JP 2756836 B2 JP2756836 B2 JP 2756836B2 JP 20408789 A JP20408789 A JP 20408789A JP 20408789 A JP20408789 A JP 20408789A JP 2756836 B2 JP2756836 B2 JP 2756836B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- sheet pile
- pipe
- sand
- gap
- 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
Links
Landscapes
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 この発明は、シートパイル引抜き時における土砂の埋
戻し方法に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for backfilling earth and sand when a sheet pile is pulled out.
「従来の技術、発明が解決せんとする問題点」 一般に、重要構造物などに近接する山留掘削工事にお
いては、山留壁の撤去に際してこれに用いたシートパイ
ルの引抜き間隙を埋戻し、主として地盤沈下などの悪影
響を周辺に及ぼさないような施工管理をする必要があ
る。"Prior art and problems to be solved by the invention" Generally, in excavation work for piers close to important structures, etc., the removal gap of the sheet pile used for removal of the pier wall was backfilled, and mainly It is necessary to manage the construction so that adverse effects such as land subsidence are not affected.
そのため従来、シートパイル引抜き後に生じた間隙に
地上部において水を散布しながら埋戻し土砂を充填して
水締めを行う方法が実施されているが、間隙全体にわた
って充分な水締めの効果が得られず、周辺地盤が相当大
きな沈下を起すという問題があった。Therefore, conventionally, a method of filling with backfilled earth and sand while spraying water on the above-ground portion in the gap generated after the sheet pile is drawn out and performing water-tightening has been implemented, but a sufficient water-tightening effect is obtained over the entire gap. However, there was a problem that the surrounding ground caused considerable settlement.
「問題点を解決するための手段」 この発明は前記従来の課題を解決するために、シート
パイルを引抜いた後に生じた間隙に、先端にノズルアダ
プターを取付けたパイプを支持架台にスライド自在に支
持して順次連結しながら所定深度まで挿入し、このパイ
プにエアー又は水、あるいはエアーと水を圧送して先端
のノズルアダプターから噴射させながら、地上部におい
て間隙に埋戻し土砂を注水と共に充填することにより、
間隙全体にわたって充分な水締め効果が得られて、周辺
地盤の沈下を確実に防止し得るようにした土砂の埋戻し
方法を提案するものである。[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention slidably supports a pipe having a nozzle adapter attached to a tip thereof in a gap formed after a sheet pile is drawn out on a support base. Inserting to the specified depth while sequentially connecting and filling the pipe with air or water, or air and water under pressure while injecting air and water from the nozzle adapter at the tip, filling back into the gap at the ground level with water injection By
An object of the present invention is to provide a method for backfilling earth and sand in which a sufficient water-tightening effect can be obtained over the entire gap and the settlement of the surrounding ground can be reliably prevented.
「実施例」 以下この発明を図面に示す実施例について説明する
と、シートパイル１を引抜いた後に生じた間隙埋戻しに
際して、この間隙に予めパイプ２を所定深度まで挿入す
る。"Embodiment" Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings. In filling back a gap generated after the sheet pile 1 is pulled out, a pipe 2 is previously inserted into this gap to a predetermined depth.
パイプ２は第２図に示すように、例えば、直径12mm前
後で長さ３〜4m程度の単位パイプ２′を順次連結してな
り、その先端にはノズルアダプター３が取付けられ、ま
た基端には流量調節バルブ４を介して高圧ホース５が取
付けられている。As shown in FIG. 2, the pipe 2 is formed by sequentially connecting, for example, unit pipes 2 'each having a diameter of about 12 mm and a length of about 3 to 4 m, a nozzle adapter 3 is attached to a distal end thereof, and a proximal end thereof. Is provided with a high-pressure hose 5 via a flow control valve 4.
そして挿入に際しては、第３図に示すように単位パイ
プ２′を順次連結しながら支脚を折り畳み自在とした支
持架台６のガイド孔７にスライド自在に支持して挿入す
ることにより、極めてスムーズに挿入作業を行うことが
できる。At the time of insertion, as shown in FIG. 3, the unit pipes 2 'are successively connected, and the support legs are slidably supported and inserted into the guide holes 7 of the support base 6, which allows the legs to be foldable, so that the insertion is extremely smooth. Work can be done.
パイプ２には、高圧ポンプによりエアー又は水、ある
いはエアーと水を圧送して先端のノズルアダプター３か
ら噴射させ、これと同時又はこれと前後して地上部にお
いて引抜き間隙に埋戻し土砂を水締め用の注水と共に泥
水状として充填する。Air or water, or air and water, is pumped into the pipe 2 by a high-pressure pump and jetted from the nozzle adapter 3 at the tip. Simultaneously with or before and after this, the backfill is filled with water in the drawing gap at the ground level. And fill with muddy water.
この場合、先端のノズルアダプター３は対象地盤及び
圧送対象に応じて噴射口の径を異にするものを選択使用
する。例えば、エアー噴射の場合には、対象地盤が粒子
間隙の粗い砂質土層であれば噴射口径が比較的大きいも
の（例えば、9mm前後）、また対象地盤が粒子間隙の密
な粘性土層であれば噴射口径が比較的小さいもの（例え
ば、２〜3mm前後）を用い、更に水噴射の場合は砂質土
層、粘性土層に拘らず噴射口径が比較的小さいもの（例
えば、２〜3mm前後）を用いることが効果的である。In this case, as the nozzle adapter 3 at the tip, one having a different diameter of the injection port is selected and used depending on the target ground and the object to be pumped. For example, in the case of air injection, if the target ground is a sandy soil layer with a coarse particle gap, the injection hole diameter is relatively large (for example, around 9 mm), and the target ground is a dense clay layer with a fine particle gap. If there is, use a relatively small injection port diameter (for example, about 2 to 3 mm), and in the case of water injection, use a relatively small injection port diameter (for example, 2 to 3 mm) regardless of the sandy soil layer and the viscous soil layer. Before and after) is effective.
このように間隙の下層部においてエアー又は水、ある
いはその両者を噴射することにより、地上部において注
水と共に充填された埋戻し土砂を撹拌し、間隙全体にわ
たって埋戻し土砂を均等かつ密実に充填させ、充分な水
締め効果が得られることになる。By injecting air or water, or both, in the lower part of the gap in this way, the backfilled soil filled with water injection in the above-ground part is stirred, and the backfilled soil is uniformly and densely filled throughout the gap, A sufficient water-tightening effect can be obtained.
比較実験例 第５図は、ある砂層地盤において従来工法と本発明工
法によるシートパイル引抜き後の埋戻し実験を行った結
果（半日後の周辺地盤の1.5m間隔毎の沈下量）を示した
ものである。Comparative Experimental Example Fig. 5 shows the results of a backfilling experiment after sheet pile drawing by a conventional method and the method of the present invention in a sandy ground (the amount of settlement of the surrounding ground at 1.5 m intervals after half a day). It is.
現場は、G.L.−8m以浅がルーズな砂層であったことか
ら、本発明による直径12mm、長さ8mのパイプを用いて先
端よりエアー及び水を噴射して実施した。Since the site was a loose sand layer at a depth of less than GL-8m, air and water were injected from the tip using a pipe having a diameter of 12mm and a length of 8m according to the present invention.
この結果から、従来工法（地上部における水締めの
み）では最大104mm（No.1）もの沈下を示したのに対し
て、エアー噴射による本発明工法ではG.L.−8m以浅の砂
層の水締めがエアーによって効果的に行われ、沈下量も
最大27mm（No.1）と最も小さかった。From these results, it was found that the conventional method (water-tightening only on the ground) showed sinking of up to 104 mm (No. 1), whereas the method of the present invention by air injection caused the water-tightening of sand layers shallower than GL-8m. The subsidence amount was 27 mm (No. 1) and the smallest.
一方、水噴射による本発明工法で従来工法に比較して
水締め効果の向上が見られたが、一定位置で水を噴射し
たため、その位置の地山が若干乱されて沈下量は最大49
mm（No.1）とエアー噴射による場合よりも大きい結果と
なった。On the other hand, the water-injection method of the present invention improved the water-tightening effect compared to the conventional method, but because water was injected at a certain position, the ground at that position was slightly disturbed and the settlement amount was up to 49%.
mm (No. 1), which was larger than that obtained by air injection.
「発明の効果」 以上の通りこの発明によれば、間隙全体にわたって充
分な水締め効果が得られて、周辺地盤の沈下を確実に防
止することができる。"Effects of the Invention" As described above, according to the present invention, a sufficient water-tightening effect is obtained over the entire gap, and the settlement of the surrounding ground can be reliably prevented.
第１図はこの発明の施工状態の概要を示す斜視図、第２
図はこの発明に用いるパイプの分解正面図、第３図はこ
の発明に用いるパイプ支持架台の斜視図、第４図は同折
り畳み状態を示す正面図、第５図はこの発明の比較実験
状況を示す平面図、第６図は従来の施工状態の概要を示
す斜視図である。 １……シートパイル、２……パイプ、３……ノズルアダ
プター、４……流量調節バルブ、５……高圧ホース、６
……支持架台、７……ガイド孔。FIG. 1 is a perspective view showing an outline of a construction state of the present invention, and FIG.
Fig. 3 is an exploded front view of a pipe used in the present invention, Fig. 3 is a perspective view of a pipe support base used in the present invention, Fig. 4 is a front view showing the folded state, and Fig. 5 is a comparative experimental situation of the present invention. FIG. 6 is a perspective view showing an outline of a conventional construction state. 1 ... Seat pile, 2 ... Pipe, 3 ... Nozzle adapter, 4 ... Flow control valve, 5 ... High pressure hose, 6
... Support stand, 7 Guide holes.
Claims (1)
持架台にスライド自在に支持した先端にノズルアダプタ
ーを取付けたパイプを順次連結しながら所定深度まで挿
入し、このパイプにエアー又は水、あるいはエアーと水
を圧送して先端のノズルアダプターから噴射させなが
ら、地上部において前記間隙に埋戻し土砂を注水と共に
充填することを特徴とするシートパイル引抜き時の土砂
埋戻し方法。1. A pipe having a nozzle adapter attached to a tip slidably supported on a support base is inserted into a gap formed after the sheet pile is drawn out to a predetermined depth while sequentially connecting the pipe to a predetermined depth, and air, water, or air is inserted into the pipe. And filling the gap with backfilled earth and sand along with water injection in the above-ground portion while feeding water and water from the nozzle adapter at the tip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20408789A JP2756836B2 (en) | 1989-08-07 | 1989-08-07 | Backfill method of earth and sand when pulling sheet pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20408789A JP2756836B2 (en) | 1989-08-07 | 1989-08-07 | Backfill method of earth and sand when pulling sheet pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0369728A JPH0369728A (en) | 1991-03-26 |
| JP2756836B2 true JP2756836B2 (en) | 1998-05-25 |
Family
ID=16484573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20408789A Expired - Fee Related JP2756836B2 (en) | 1989-08-07 | 1989-08-07 | Backfill method of earth and sand when pulling sheet pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2756836B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4716615B2 (en) * | 2001-06-23 | 2011-07-06 | 山下ゴム株式会社 | Liquid seal vibration isolator |
-
1989
- 1989-08-07 JP JP20408789A patent/JP2756836B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0369728A (en) | 1991-03-26 |
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