JP3220764B2 - Removal method of hollow cylindrical pile made of reinforced concrete - Google Patents
Removal method of hollow cylindrical pile made of reinforced concreteInfo
- Publication number
- JP3220764B2 JP3220764B2 JP02279993A JP2279993A JP3220764B2 JP 3220764 B2 JP3220764 B2 JP 3220764B2 JP 02279993 A JP02279993 A JP 02279993A JP 2279993 A JP2279993 A JP 2279993A JP 3220764 B2 JP3220764 B2 JP 3220764B2
- Authority
- JP
- Japan
- Prior art keywords
- reinforced concrete
- hollow cylindrical
- hollow
- cylindrical pile
- pile
- 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
【０００１】[0001]
【産業上の利用分野】本発明は、地中に埋設されたＰＣ
杭やＲＣ杭等の鉄筋コンクリート製中空円筒杭を無公
害、無騒音で引き抜く撤去方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground PC
The present invention relates to a method for removing a hollow cylindrical pile made of reinforced concrete such as a pile or an RC pile without pollution and without noise.
【０００２】[0002]
【従来の技術】従来、地中に埋設された鉄筋コンクリー
ト製中空円筒杭を撤去する場合には、鉄筋コンクリート
製中空円筒杭の周囲を掘削して撤去したり、鉄筋コンク
リート製中空円筒杭の中空部内に薬液を注入し、膨脹作
用により内部亀裂を生じさせて破壊して撤去する方法
や、ダイナマイトによる爆破や打撃による破壊後撤去す
る方法等が用いられていた。2. Description of the Related Art Conventionally, when a hollow cylindrical pile made of reinforced concrete buried in the ground is removed, the periphery of the hollow cylindrical pile made of reinforced concrete is excavated and removed. And a method of causing internal cracks by expansion action to break and remove, or a method of blasting with dynamite or removing after destruction by impact, etc. have been used.
【０００３】[0003]
【発明が解決しようとする課題】しかし、薬液による破
壊方法では土壌汚染の心配があり、また、ダイナマイト
による爆破や打撃破壊方法では騒音や振動等の環境公害
が問題となる。However, there is a concern about soil contamination in the destruction method using a chemical solution, and environmental pollution such as noise and vibration becomes a problem in the blasting or impact destruction method using dynamite.
【０００４】そこで本発明は、鉄筋コンクリート製中空
円筒杭の周囲を掘削することなく無公害、無騒音で撤去
する撤去方法を提供することを目的としている。[0004] Therefore, an object of the present invention is to provide a removal method for removing a reinforced concrete hollow cylindrical pile without pollution and without noise.
【０００５】[0005]
【課題を解決するための手段】上記した目的を達成する
ため本発明の鉄筋コンクリート製中空円筒杭の撤去方法
は、鉄筋コンクリート製中空円筒杭の中空部内に低温液
化ガスを充填し、次いで中空部開口を密閉して鉄筋コン
クリート製中空円筒杭を冷却するとともに、中空部内を
液化ガスの気化によるガスで加圧保持して鉄筋コンクリ
ート製中空円筒杭壁に亀裂を発生させ、中空部内の圧力
が減少した後に中空部内に注水して前記亀裂に水を浸透
せしめ、再び鉄筋コンクリート製中空円筒杭の中空部内
に低温液化ガスを充填して、中空部開口を密閉して鉄筋
コンクリート製中空円筒杭を冷却するとともに、中空部
内を液化ガスの気化によるガスで加圧保持して鉄筋コン
クリート製中空円筒杭壁に前記亀裂を増加成長させ、こ
れを繰り返して前記亀裂によって中空部と外部を連通せ
しめ、該亀裂から杭外部へ水を排出させた後、常温状態
にして鉄筋コンクリート製中空円筒杭を引き抜くことを
特徴としている。In order to achieve the above-mentioned object, a method for removing a hollow cylindrical pile made of reinforced concrete according to the present invention comprises filling a hollow portion of a hollow cylindrical pile made of reinforced concrete with a low-temperature liquefied gas and then opening an opening of the hollow portion. While cooling the hollow cylindrical pile made of reinforced concrete, the inside of the hollow part is cracked by holding the inside of the hollow part under pressure with the gas generated by the vaporization of liquefied gas, causing a crack in the wall of the hollow cylindrical pile made of reinforced concrete. To infiltrate the cracks with water, fill the hollow portion of the reinforced concrete hollow cylindrical pile with low-temperature liquefied gas again, close the opening of the hollow portion, cool the reinforced concrete hollow cylindrical pile, and cool the hollow portion. The crack is increased and grown on the hollow cylindrical pile wall made of reinforced concrete by pressurizing and holding the gas by the vaporization of the liquefied gas. It cracking the allowed communicating hollow portion and the outside After draining the water from the crack to Kuigai unit is characterized by withdrawing the reinforced concrete hollow cylindrical pile in the normal temperature state.
【０００６】[0006]
【作 用】鉄筋コンクリート製中空円筒杭の中空部内に
充填された液化ガスは、鉄筋コンクリート製中空円筒杭
を冷却してコンクリート内の水分を凍結して体積を膨脹
させるとともに、液化ガスが気化して発生する気化ガス
の圧力によって中空部内を加圧保持して鉄筋コンクリー
ト製中空円筒杭壁面に亀裂を生じさせる。[Operation] The liquefied gas filled in the hollow part of the reinforced concrete hollow cylindrical pile cools the reinforced concrete hollow cylindrical pile, freezes the moisture in the concrete, expands the volume, and evaporates the liquefied gas. The inside of the hollow portion is pressurized and held by the pressure of the evaporating gas to generate cracks on the reinforced concrete hollow cylindrical pile wall surface.
【０００７】この亀裂に中空部内に注水された水がさら
に浸透し、再び充填された液化ガスで凍結され体積を膨
脹させるとともに、中空部内が気化によるガスの圧力に
よって加圧保持されるので、亀裂が増加成長する。[0007] The water injected into the hollow portion penetrates into the crack and is further frozen by the refilled liquefied gas to expand the volume, and the inside of the hollow portion is pressurized and held by the gas pressure due to vaporization. Grow to increase.
【０００８】これを繰り返すことにより、亀裂が中空部
内と外部を連通し、注水された水が亀裂から杭外部へ排
出し、杭周囲の土壌を軟弱化するとともに、杭の全体体
積が減少し杭の周囲に空隙を発生させて鉄筋コンクリー
ト製中空円筒杭の引き抜きを容易にする。[0008] By repeating this, the crack communicates between the inside and the outside of the hollow portion, the injected water is discharged from the crack to the outside of the pile, the soil around the pile is softened, and the overall volume of the pile is reduced and the pile is reduced. A void is generated around the slab to facilitate pulling out of the hollow cylindrical pile made of reinforced concrete.
【０００９】[0009]
【実施例】以下、本発明を図面に示す実施例に基づい
て、さらに詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings.
【００１０】先ず、図１に示されるように、地中に埋設
された鉄筋コンクリート製中空円筒杭１は、例えば、遠
心力成形された鉄筋コンクリート杭（ＲＣ杭）、あるい
はプレストレストコンクリート杭（ＰＣ杭）からなり、
該鉄筋コンクリート製中空円筒杭１の中空部２に、上部
開口３から液体窒素等の液化ガス４を充填する液化ガス
充填工程を行う。次いで、図２に示されるように、上部
開口３を蓋部材５で密閉する加圧保持工程を行う。First, as shown in FIG. 1, a hollow cylindrical pile 1 made of reinforced concrete buried in the ground is made of, for example, a reinforced concrete pile (RC pile) formed by centrifugal force or a prestressed concrete pile (PC pile). Become
A liquefied gas filling step of filling a liquefied gas 4 such as liquid nitrogen into the hollow portion 2 of the reinforced concrete hollow cylindrical pile 1 from the upper opening 3 is performed. Next, as shown in FIG. 2, a pressure holding step of closing the upper opening 3 with the lid member 5 is performed.
【００１１】鉄筋コンクリート製中空円筒杭１は、中空
部２に充填された液化ガス４により急速に冷却される。
これにより、鉄筋コンクリート製中空円筒杭１のコンク
リート内の水分が凍結してその体積を膨脹させる。ま
た、中空部２の内壁は、充填された液化ガス４の気化に
よるガスの圧力によって加圧され、加圧状態に保持され
るので、中空部２の内壁に亀裂６が発生する。The reinforced concrete hollow cylindrical pile 1 is rapidly cooled by the liquefied gas 4 filled in the hollow part 2.
As a result, the moisture in the concrete of the hollow cylindrical pile 1 made of reinforced concrete freezes to expand its volume. Further, the inner wall of the hollow portion 2 is pressurized by the pressure of the gas due to the vaporization of the filled liquefied gas 4 and is kept in a pressurized state, so that a crack 6 is generated on the inner wall of the hollow portion 2.
【００１２】中空部２の圧力が減少した後に蓋部材５を
外して、図３に示されるように、中空部２内に上部開口
３から注水して中空部２の内壁に発生した亀裂６に水７
を浸透させる浸水工程を行う。After the pressure in the hollow portion 2 is reduced, the lid member 5 is removed, and as shown in FIG. 3, water is injected into the hollow portion 2 from the upper opening 3 to form a crack 6 generated on the inner wall of the hollow portion 2. Water 7
Perform a water immersion step to penetrate.
【００１３】そして、図４に示されるように、再び上部
開口３から液体窒素等の液化ガス４を充填する液化ガス
充填工程を行い、続いて、図５に示されるように、上部
開口３を蓋部材５で密閉する加圧保持工程を行う。Then, as shown in FIG. 4, a liquefied gas filling step of again filling a liquefied gas 4 such as liquid nitrogen from the upper opening 3 is performed, and then, as shown in FIG. A pressure holding step of sealing with the lid member 5 is performed.
【００１４】これにより、亀裂６に浸透した水７が凍結
され体積を膨脹させるとともに、中空部２内が気化ガス
の圧力によって加圧状態に保持されるので、亀裂６が増
加成長する。As a result, the water 7 permeating the cracks 6 is frozen to expand the volume, and the inside of the hollow portion 2 is kept pressurized by the pressure of the vaporized gas, so that the cracks 6 grow and grow.
【００１５】そして、上記の液化ガス充填工程、加圧保
持工程、浸水工程を繰り返し行うことにより、亀裂６を
増加成長せしめ、鉄筋コンクリート製中空円筒杭１の中
空部２と外部とを連通させ、図６に示されるように、亀
裂６から鉄筋コンクリート製中空円筒杭１の周囲に水７
を排出し、鉄筋コンクリート製中空円筒杭１の周囲の土
壌を軟弱化するとともに、鉄筋コンクリート製中空円筒
杭１の全体体積を減少して、鉄筋コンクリート製中空円
筒杭１の周囲に空隙を発生させて鉄筋コンクリート製中
空円筒杭１の引き抜きを行う。By repeatedly performing the liquefied gas filling step, the pressure holding step, and the flooding step, the cracks 6 are increased and the hollow portion 2 of the reinforced concrete hollow cylindrical pile 1 is communicated with the outside. As shown in FIG. 6, water 7 flows around the hollow cylindrical pile 1 made of reinforced concrete from the crack 6.
Is discharged to soften the soil around the hollow cylindrical pile 1 made of reinforced concrete, reduce the overall volume of the hollow cylindrical pile 1 made of reinforced concrete, and generate a void around the hollow cylindrical pile 1 made of reinforced concrete. The hollow cylindrical pile 1 is pulled out.
【００１６】このようにして鉄筋コンクリート製中空円
筒杭１を撤去するので、騒音等の公害は発生せず、しか
も、鉄筋コンクリート製中空円筒杭１の周囲を掘削する
ことなく撤去できる。Since the hollow cylindrical pile 1 made of reinforced concrete is removed in this manner, no pollution such as noise occurs, and the hollow cylindrical pile 1 made of reinforced concrete can be removed without excavating the periphery.
【００１７】尚、鉄筋コンクリート製中空円筒杭の中空
部の容積を少なくするために、炭素鋼等からなる空間減
容体を挿入することにより、鉄筋コンクリート製中空円
筒杭の中空部に充填される液化ガスや水の使用量を低減
することができる。In order to reduce the volume of the hollow portion of the hollow reinforced concrete hollow cylindrical pile, a liquefied gas filled in the hollow portion of the reinforced concrete hollow cylindrical pile is inserted by inserting a space volume reducer made of carbon steel or the like. The amount of water used can be reduced.
【００１８】[0018]
【発明の効果】以上説明したように、本発明の鉄筋コン
クリート製中空円筒杭の撤去方法は、鉄筋コンクリート
製中空円筒杭の中空部内に低温液化ガスを充填し、次い
で中空部開口を密閉して鉄筋コンクリート製中空円筒杭
を冷却するとともに、中空部内を液化ガスの気化による
ガスで加圧保持して、鉄筋コンクリート製中空円筒杭壁
面に亀裂を生じさせ、さらに中空部内の圧力が減少した
後に中空部内に注水して亀裂に水を浸透せしめ、再び鉄
筋コンクリート製中空円筒杭の中空部内に低温液化ガス
を充填し、中空部開口を密閉して水を凍結させるととも
に、中空部内を液化ガスの気化によるガスで加圧保持し
て亀裂を増加成長させ、これを繰り返すことにより、亀
裂によって中空部内と外部を連通させ、注水された水を
亀裂から杭外部へ排出して、杭周囲の土壌を軟弱化する
とともに、杭の周囲に空隙を発生させて鉄筋コンクリー
ト製中空円筒杭の引き抜きを容易にするので、鉄筋コン
クリート製中空円筒杭の周囲を掘削することなく無公
害、無騒音で撤去できる。As described above, according to the method for removing a hollow cylindrical pile made of reinforced concrete according to the present invention, the hollow part of the hollow cylindrical pile made of reinforced concrete is filled with a low-temperature liquefied gas, and then the opening of the hollow part is closed to make the hollow cylindrical pile made of reinforced concrete. While cooling the hollow cylindrical pile, the inside of the hollow part is pressurized and held by the gas due to the vaporization of the liquefied gas, causing cracks in the wall of the hollow cylindrical pile made of reinforced concrete, and after the pressure in the hollow part is reduced, water is poured into the hollow part. To infiltrate water into the cracks, fill the hollow part of the reinforced concrete hollow cylindrical pile with low-temperature liquefied gas again, close the hollow part opening to freeze the water, and pressurize the hollow part with the gas by vaporization of the liquefied gas. By holding and growing the crack to increase and repeating this, the crack communicates with the inside and outside of the hollow part, and the injected water flows from the crack to the outside of the pile Out and soften the soil around the piles, and create voids around the piles to make it easier to pull out the reinforced concrete hollow cylindrical piles. It can be removed without noise.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 液化ガス充填工程を示す断面図である。FIG. 1 is a sectional view showing a liquefied gas filling step.
【図２】 加圧保持工程を示す断面図である。FIG. 2 is a cross-sectional view showing a pressure holding step.
【図３】 浸水工程を示す断面図である。FIG. 3 is a sectional view showing a water immersion step.
【図４】 液化ガス充填工程を示す断面図である。FIG. 4 is a sectional view showing a liquefied gas filling step.
【図５】 加圧保持工程を示す断面図である。FIG. 5 is a sectional view showing a pressure holding step.
【図６】 水の排出状態を示す断面図である。FIG. 6 is a cross-sectional view showing a state of discharging water.
１…鉄筋コンクリート製中空円筒杭、２…中空部、３…
上部開口、４…液化ガス、５…蓋部材、６…亀裂、７…
水1: hollow cylindrical pile made of reinforced concrete, 2: hollow part, 3:
Upper opening, 4 ... liquefied gas, 5 ... lid member, 6 ... crack, 7 ...
water
フロントページの続き (72)発明者 高池 明 神奈川県川崎市幸区塚越四丁目320番地 日本酸素株式会社内 (72)発明者 福丸 恵治 東京都渋谷区千駄ヶ谷四丁目６番15号 株式会社フジタ内 (56)参考文献 特開 平１−97719（ＪＰ，Ａ) 実開 昭61−180294（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) E02D 9/00 Continued on the front page (72) Inventor Akira Takaike 4-320 Tsukakoshi, Saiwai-ku, Kawasaki-shi, Kanagawa Nippon Sanso Corporation (72) Inventor Keiji Fukumaru 4-6-115 Sendagaya, Shibuya-ku, Tokyo Fujita Corporation (56) References JP-A-1-97719 (JP, A) JP-A-61-180294 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) E02D 9/00
Claims (1)
内に低温液化ガスを充填し、次いで中空部開口を密閉し
て鉄筋コンクリート製中空円筒杭を冷却するとともに、
中空部内を液化ガスの気化によるガスで加圧保持して鉄
筋コンクリート製中空円筒杭壁に亀裂を発生させ、中空
部内の圧力が減少した後に中空部内に注水して前記亀裂
に水を浸透せしめ、再び鉄筋コンクリート製中空円筒杭
の中空部内に低温液化ガスを充填して、中空部開口を密
閉して鉄筋コンクリート製中空円筒杭を冷却するととも
に、中空部内を液化ガスの気化によるガスで加圧保持し
て鉄筋コンクリート製中空円筒杭壁に前記亀裂を増加成
長させ、これを繰り返して前記亀裂によって中空部と外
部を連通せしめ、該亀裂から杭外部へ水を排出させた
後、常温状態にして鉄筋コンクリート製中空円筒杭を引
き抜くことを特徴とする鉄筋コンクリート製中空円筒杭
の撤去方法。1. A hollow cylindrical pile made of reinforced concrete is filled with a low-temperature liquefied gas, and the opening of the hollow is closed to cool the hollow cylindrical pile made of reinforced concrete.
The inside of the hollow part is pressurized and held by the gas by the vaporization of the liquefied gas to generate a crack in the hollow cylindrical pile wall made of reinforced concrete, and after the pressure in the hollow part decreases, water is injected into the hollow part to allow water to permeate the crack, and again. The hollow portion of the reinforced concrete hollow cylindrical pile is filled with low-temperature liquefied gas, the opening of the hollow portion is sealed, the reinforced concrete hollow cylindrical pile is cooled, and the hollow portion is pressurized and held by the gas generated by the vaporization of the liquefied gas. The cracks are increased and grown on the hollow cylindrical pile wall, and the cracks are repeated to allow the hollow portion to communicate with the outside by the cracks, and water is discharged from the cracks to the outside of the pile. A method for removing a reinforced concrete hollow cylindrical pile, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02279993A JP3220764B2 (en) | 1993-02-10 | 1993-02-10 | Removal method of hollow cylindrical pile made of reinforced concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02279993A JP3220764B2 (en) | 1993-02-10 | 1993-02-10 | Removal method of hollow cylindrical pile made of reinforced concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06235218A JPH06235218A (en) | 1994-08-23 |
| JP3220764B2 true JP3220764B2 (en) | 2001-10-22 |
Family
ID=12092737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02279993A Expired - Fee Related JP3220764B2 (en) | 1993-02-10 | 1993-02-10 | Removal method of hollow cylindrical pile made of reinforced concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3220764B2 (en) |
-
1993
- 1993-02-10 JP JP02279993A patent/JP3220764B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06235218A (en) | 1994-08-23 |
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