JP3478638B2 - Thawing of frozen ground and method of preventing thawing shrinkage - Google Patents
Thawing of frozen ground and method of preventing thawing shrinkageInfo
- Publication number
- JP3478638B2 JP3478638B2 JP17018295A JP17018295A JP3478638B2 JP 3478638 B2 JP3478638 B2 JP 3478638B2 JP 17018295 A JP17018295 A JP 17018295A JP 17018295 A JP17018295 A JP 17018295A JP 3478638 B2 JP3478638 B2 JP 3478638B2
- Authority
- JP
- Japan
- Prior art keywords
- thawing
- pipe
- frozen soil
- shrinkage
- tube
- 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 - Lifetime
Links
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、地盤改良工事に利用さ
れる凍結工法において、造成された凍土の解凍収縮によ
る周辺構築物への影響を防止するため、所要凍土の解凍
及び解凍された凍土に解凍収縮防止材を注入する方法に
関するものである。
【０００２】
【従来の技術】地盤改良を目的とする凍結工法において
は、凍土の造成中及び造成後の周辺の側壁などの構造物
の沈下を防止するための一方法として、部分的に凍土を
解凍し、解凍収縮防止用の充填材を注入することが行わ
れている。而して、この方法においては、凍土解凍用の
加熱管と充填材注入管とは別個に設置されていたが、こ
れでは所要の管の数が多く、施工設置管及び構造物例え
ばシ−ルドトンネルに設ける貫通孔の数が多くなるの
で、作業が煩雑となり、工事費も高く付くため、前記管
及び貫通孔の削減と作業の簡易化が望まれている。
【０００３】
【発明が解決しようとする課題】本発明は、上述のよう
な従来技術に鑑み、凍結工法において、従来の凍土解凍
用の加熱管と解凍土への解凍収縮防止材を充填するため
の注入管の設置本数及び構造物への加熱管，注入管挿入
用の貫通孔数を減少させると共に、管の設置作業、解凍
・注入作業及び管の撤去作業を容易にする方法を提供す
ることを、課題とするものである。
【０００４】
【課題を解決するための手段】上記課題を解決すること
を目的としてなされた本発明凍結地盤の解凍及び解凍収
縮を防止する方法の構成は、地中に埋設した凍結管に冷
媒を流通させて凍土を造成する凍結工法において、造成
された凍土に、該凍土を強制的に解凍するための加熱管
と解凍された凍土に解凍収縮防止材を注入するための注
入管とを収装し一体化した外管を埋設して、前記加熱管
に温水を通し外管内を循環させることにより外管外周の
凍土を解凍し、解凍された凍土内に前記注入管から解凍
収縮防止材を注入することを特徴とするものである。
【０００５】
【作用】本発明方法によれば、造成された凍土の必要箇
所に、該凍土を強制的に解凍するための加熱管と、解凍
土に解凍収縮防止材を注入するための注入管とを収装し
て一体化した外管をボ−リング設置し、前記凍土の解凍
及び解凍土への解凍収縮防止材の注入を行うようにした
から、前記外管を複数個ボ−リング設置することによ
り、連続的にしかも簡易に前記作業を行うことが出来
る。
【０００６】
【実施例】次に、本発明の実施の一例を図により説明す
る。図１は本発明方法の実施に使用する管の一例の縦断
正面図、図２は図１の平面図、図３は凍土を解凍してい
る状態の断面図、図４は解凍土に解凍収縮防止材を注入
している状態の断面図である。
【０００７】図１，２において、１は外管、1aは下端部
にボ−リング用の刃先11を設けた下部外管で、これら外
管１と下部外管1aは接続リング２を介して接続されてい
る。３は送水管、31は該送水管３の先端部に装着した逆
止弁で、送水管３は逆止弁31を下部外管1aに設けた底板
12から突出させて外管１に挿入してあり、送水管３に水
を圧送すれば、水は逆止弁31により逆流を防止され底板
12の外部に排出されるようになっている。また、４は解
凍収縮防止材を解凍土に注入するための注入管、41は前
記接続リング２に固定された継手、42は接続リング２に
設けられた注入孔で、継手41には解凍収縮防止材の通路
43が注入孔42に連通させて設けられており、注入管４に
解凍収縮防止材を送り込めば、該解凍収縮防止材は該管
内を通り、通路43を通って注入孔42から排出されるよう
になっている。一方、５は温水を外管１，1a内に送り込
む加熱管で、この加熱管５に温水を送り込めば、温水は
外管１，1a内に充満してそれら管を加熱し、外管１の上
部に設けた排出管６から排出されるようになっている。
尚、13は外管１の上部に取付けた蓋板で、送水管３，注
入管４及び加熱管５の上部を一体化し支持するものであ
る。７は地盤に造成された凍土、８はシ−ルド機により
該凍土７を掘削して構築したシ−ルドトンネルのセグメ
ントである。尚、９は地盤を凍結するための凍結管であ
る。
【０００８】本発明方法は上記の管を用いて実施するも
ので、前記セグメント８の貫通部に予め設置されたスリ
−ブ管（図示せず）に外管１を通してから、送水管３に
水を送り込みながら、ボ−リング刃先11により凍土７を
ボ−リングし、外管１が凍土７の所定深さまで埋設され
たらボ−リング作業を停止する。
【０００９】上記のようにしてボ−リングが終ったら、
送水管３への送水を停止し、加熱管５に温水を供給し、
外管１，1a内を循環させてそれら管の外周の凍土７を解
凍する。温水の循環は、温水が外管１，1aに充満したら
排出管６から排出されることにより行われる。この温水
の循環による凍土７の解凍状態は、予め対象となる解凍
部に測温管（図示せず）を埋設しておき、該測温管に設
置された温度計により知ることが出来る。
【００１０】上記の解凍作業により凍土７の所定範囲が
解凍されて解凍部11になったら、注入管４に解凍収縮防
止材を圧送すれば、解凍収縮防止材は注入孔42から解凍
部10内に噴出されて解凍収縮防止材注入部11が形成さ
れ、解凍部10の沈下防止のための土質の改良がなされる
のである。
【００１１】尚、上記の作業において、ボ−リング時に
おいては、外管１に加熱管５を装備しない状態でボ−リ
ング作業を行い、該作業が終了したら、一旦、外管１を
抜去して加熱管５を装備した後、再び外管１を凍土８内
に埋設し、解凍作業，注入作業を行うようにしてもよ
く、また、注入作業において、必要があれば、送水管３
からも解凍収縮防止材を噴出するようにしてもよい。更
に、解凍作業と注入作業を同時に行うようにしてもよ
い。
【００１２】
【発明の効果】本発明は上述のとおりであって、本発明
方法によれば、造成された凍土の必要箇所に、該凍土を
強制的に解凍するための加熱管と解凍された解凍部に解
凍収縮防止材を注入するための注入管とを収装して一体
化した外管をボ−リング設置し、前記凍土の解凍及び解
凍部への解凍収縮防止材の注入を行うようにしたから、
前記外管を複数個ボ−リング設置することにより、連続
的に前記作業を行うことが出来て該作業を簡易化するこ
とが出来ると共に、使用する管の数を従来方法に比し、
著しく節減出来て、工事費の大幅な削減を図ることが可
能となる。
【００１３】また、本発明において使用する管は、凍土
解凍用の加熱管と解凍部に解凍収縮防止材を注入する注
入管とを、先端部にボ−リング用刃先を具えた外管に収
装して一体化したから、構成が簡潔で、容易に形成する
ことが出来、この管を使用することにより、ボ−リン
グ，凍土の解凍，解凍部への解凍収縮防止材の注入作業
を連続的に行うことが出来るので、上記のような効果を
得ることが出来る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freezing method used for ground improvement work, in order to prevent the thawing and shrinkage of the formed frozen soil from affecting the surrounding structures. The present invention relates to a method of thawing required frozen soil and injecting a thaw-shrinkage prevention material into the thawed frozen soil. 2. Description of the Related Art In a freezing method for the purpose of improving the ground, as one method for preventing subsidence of a structure such as a peripheral side wall during and after formation of frozen soil, the frozen soil is partially removed. Defrosting and injecting a filler for preventing thawing shrinkage are performed. Thus, in this method, the heating pipe for thawing the frozen soil and the filler injection pipe are separately installed. However, in this method, the number of required pipes is large, and the installation installation pipe and a structure such as a shield are required. Since the number of through holes provided in the tunnel increases, the work becomes complicated and the construction cost increases. Therefore, it is desired to reduce the number of pipes and through holes and simplify the work. SUMMARY OF THE INVENTION [0003] In view of the above-mentioned prior art, the present invention aims at filling a conventional heating pipe for freezing soil thawing and a material for preventing thawing shrinkage into the thawing soil in a freezing method. To provide a method of reducing the number of injection pipes to be installed and the number of through-holes for inserting heating pipes and injection pipes into a structure and facilitating pipe installation work, thawing / injection work, and pipe removal work. Is an issue. SUMMARY OF THE INVENTION [0004] A method of preventing thawing and thawing of frozen ground according to the present invention, which has been made to solve the above-mentioned problems, comprises a method of supplying a refrigerant to a freezing tube buried underground. In the freezing method of creating frozen soil by circulating, a heating pipe for forcibly thawing the frozen soil and an injection pipe for injecting a thawing prevention material into the thawed frozen soil are provided in the created frozen soil. By burying the integrated outer tube, circulating the heated tube through the heating tube and circulating through the outer tube, thaws the frozen soil around the outer tube and injects the anti-thaw shrinkage material from the injection tube into the thawed frozen soil. It is characterized by doing. According to the method of the present invention, a heating pipe for forcibly thawing the frozen soil at a necessary place of the formed frozen soil, and an injection pipe for injecting the thawing shrinkage preventing material into the thawed soil. And the integrated outer tube is installed in a bowl, and the frozen soil is thawed and a material for preventing thawing shrinkage is injected into the thawed soil. By doing so, the work can be performed continuously and easily. Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a longitudinal sectional front view of an example of a pipe used for carrying out the method of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a cross-sectional view of a state where frozen soil is thawed, and FIG. It is sectional drawing of the state which has injected | blocked the prevention material. In FIGS. 1 and 2, 1 is an outer tube, 1a is a lower outer tube provided with a cutting edge 11 for boring at the lower end, and these outer tube 1 and lower outer tube 1a are connected via a connecting ring 2. It is connected. 3 is a water pipe, 31 is a check valve attached to the tip of the water pipe 3, and the water pipe 3 is a bottom plate provided with the check valve 31 on the lower outer pipe 1a.
12 is inserted into the outer pipe 1 so as to protrude from the outer pipe 1, and when water is pressure-fed to the water pipe 3, the water is prevented from flowing backward by the check valve 31 and the bottom plate is
It is designed to be discharged outside the twelve. Reference numeral 4 denotes an injection pipe for injecting the thawing-shrinkage-preventing material into the thawing soil; 41, a joint fixed to the connection ring 2; 42, an injection hole provided in the connection ring 2; Passage of prevention material
43 is provided in communication with the injection hole 42, and when the anti-thaw-shrinkage material is fed into the injection tube 4, the anti-thaw-shrinkage material passes through the inside of the tube and is discharged from the injection hole 42 through the passage 43. It has become. On the other hand, 5 is a heating pipe for sending hot water into the outer pipes 1 and 1a. If hot water is sent to the heating pipe 5, the hot water fills the outer pipes 1 and 1a and heats those pipes. Is discharged from a discharge pipe 6 provided at the upper part of the hopper.
Reference numeral 13 denotes a cover plate attached to the upper portion of the outer tube 1 for integrally supporting the upper portions of the water pipe 3, the injection pipe 4 and the heating pipe 5. Reference numeral 7 denotes a frozen soil formed on the ground, and reference numeral 8 denotes a shield tunnel segment constructed by excavating the frozen soil 7 using a shield machine. Reference numeral 9 denotes a freezing tube for freezing the ground. [0008] The method of the present invention is carried out using the above-mentioned pipe. The outer pipe 1 is passed through a sleeve pipe (not shown) previously installed in the penetrating portion of the segment 8, and the water is supplied to the water pipe 3. The frozen soil 7 is bored by the boring blade 11 while the outer tube 1 is buried to a predetermined depth of the frozen soil 7, and the boring operation is stopped. When the boring is completed as described above,
Stop water supply to the water supply pipe 3, supply hot water to the heating pipe 5,
Circulating in the outer pipes 1 and 1a, the frozen soil 7 on the outer circumference of those pipes is thawed. The circulation of the hot water is performed by discharging the hot water from the discharge pipe 6 when the outer pipes 1 and 1a are filled. The thawing state of the frozen soil 7 due to the circulation of the hot water can be known by a thermometer (not shown) in which a temperature measuring tube (not shown) is buried in advance in a target thawing section. When the predetermined range of the frozen soil 7 is thawed by the above-described thawing operation and becomes the thawing section 11, the thawing / shrinkage preventing material is pumped into the injection pipe 4. The thawing portion is injected into the thawing portion to form the thawing-shrinkage-preventing-material injecting portion 11, and the soil is improved to prevent the thawing portion 10 from sinking. In the above-mentioned work, when boring, the boring work is performed in a state in which the outer tube 1 is not equipped with the heating tube 5, and once the work is completed, the outer tube 1 is once removed. After the heating pipe 5 is provided, the outer pipe 1 may be buried again in the frozen soil 8 to perform the thawing operation and the pouring operation.
Alternatively, the thawing / shrinkage preventing material may be ejected. Further, the thawing operation and the injection operation may be performed simultaneously. The present invention is as described above. According to the method of the present invention, a heating pipe for forcibly thawing the frozen soil is provided at a necessary location of the created frozen soil. An outer tube integrated with an injection pipe for injecting the thawing-prevention material into the thawing part is installed in a bowl, and the frozen soil is thawed and the thawing-prevention material is injected into the thawing part. Because
By installing a plurality of the outer pipes, the work can be performed continuously and the work can be simplified, and the number of pipes used is smaller than that of the conventional method.
Significant savings can be made, and significant reductions in construction costs can be achieved. [0013] The pipe used in the present invention comprises a heating pipe for thawing the frozen soil and an injection pipe for injecting the thawing-preventing material into the thawing section in an outer pipe having a cutting edge for boring at the tip. Since it is integrated by mounting it, the structure is simple and it can be easily formed. By using this pipe, boring, thawing of frozen soil, and injection work of thawing shrinkage prevention material into the thawing part can be performed continuously. Therefore, the above-described effects can be obtained.
【図面の簡単な説明】
【図１】本発明方法の実施に使用する管の一例の縦断正
面図。
【図２】図１の縦断平面図。
【図３】凍土を解凍している状態の断面図。
【図４】解凍土に解凍収縮防止材を注入している状態の
断面図。
【符号の説明】
１，1a 外管
11 ボ−リング用刃先
12 底板
13 蓋板
２ 接続リング
３ 送水管
31 逆止弁
４ 解凍収縮防止材注入管
41 継手
42 接続リングに設けた注入孔
43 解凍収縮防止材の通路
５ 加熱管
６ 温水の排出管
７ 凍土
８ セグメント
９ 凍結管
10 解凍部
11 解凍収縮防止材注入部BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional front view of an example of a tube used for carrying out the method of the present invention. FIG. 2 is a vertical sectional plan view of FIG. FIG. 3 is a cross-sectional view of a state where frozen ground is being thawed. FIG. 4 is a cross-sectional view of a state in which a thawing-shrinkage preventing material is injected into the thawing soil. [Description of Signs] 1,1a Outer pipe 11 Cutting edge for boring 12 Bottom plate 13 Cover plate 2 Connection ring 3 Water supply pipe 31 Check valve 4 Defrosting / shrinkage prevention material injection pipe 41 Joint 42 Injection hole 43 provided in connection ring 43 Defrost Passage of shrinkage prevention material 5 Heating pipe 6 Hot water discharge pipe 7 Frozen soil 8 Segment 9 Freezing pipe 10 Thawing section 11 Thawing shrinkage prevention material injection section
フロントページの続き (72)発明者 小 椋 浩 大阪府大阪市中央区瓦屋町２丁目11番16 号 株式会社精研内 (56)参考文献 特開 平６−336721（ＪＰ，Ａ) 特開 平７−34783（ＪＰ，Ａ) 特開 平８−296390（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) E02D 3/115 Continuation of the front page (72) Inventor Hiroshi Ogura 2-11-16 Kawaraya-cho, Chuo-ku, Osaka-shi, Osaka Prefectural Seiken Co., Ltd. (56) References JP-A-6-336721 (JP, A) JP-A-Hei 7-34783 (JP, A) JP-A-8-296390 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) E02D 3/115
Claims (1)
て凍土を造成する凍結工法において、造成された凍土
に、該凍土を強制的に解凍するための加熱管と解凍され
た凍土に解凍収縮防止材を注入するための注入管とを収
装し一体化した外管を埋設して、前記加熱管に温水を通
し外管内を循環させることにより外管外周の凍土を解凍
し、解凍された凍土内に前記注入管から解凍収縮防止材
を注入することを特徴とする凍結地盤の解凍及び解凍収
縮防止方法。(57) [Claims 1] In a freezing method in which a refrigerant is circulated through a freezing tube buried underground to create frozen soil, the frozen soil is forcibly thawed into the created frozen soil. A heating tube and an injection tube for injecting the thawing anti-shrinkage material into the thawed frozen soil are housed, and an integrated outer tube is buried, and hot water is passed through the heating tube and circulated through the outer tube. A method for preventing thawing and thawing of frozen ground, characterized by thawing frozen soil around the pipe and injecting a thawing-shrinkage-preventing material from the injection pipe into the thawed frozen soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17018295A JP3478638B2 (en) | 1995-06-13 | 1995-06-13 | Thawing of frozen ground and method of preventing thawing shrinkage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17018295A JP3478638B2 (en) | 1995-06-13 | 1995-06-13 | Thawing of frozen ground and method of preventing thawing shrinkage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08338015A JPH08338015A (en) | 1996-12-24 |
| JP3478638B2 true JP3478638B2 (en) | 2003-12-15 |
Family
ID=15900213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17018295A Expired - Lifetime JP3478638B2 (en) | 1995-06-13 | 1995-06-13 | Thawing of frozen ground and method of preventing thawing shrinkage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3478638B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11091893B2 (en) | 2017-05-11 | 2021-08-17 | Vinci Construction | Method and device for freezing a mass of soil |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706697A (en) * | 2016-12-13 | 2017-05-24 | 常州工学院 | Model test device for simulating pre-cooling freezing method construction under flowing effect of underground water |
| CN113668500A (en) * | 2021-09-15 | 2021-11-19 | 中国建筑第八工程局有限公司 | Freezer for freezing artificial stratum |
-
1995
- 1995-06-13 JP JP17018295A patent/JP3478638B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11091893B2 (en) | 2017-05-11 | 2021-08-17 | Vinci Construction | Method and device for freezing a mass of soil |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08338015A (en) | 1996-12-24 |
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