JPH0469490A - Sealing material and sealing method - Google Patents

Sealing material and sealing method

Info

Publication number
JPH0469490A
JPH0469490A JP2182323A JP18232390A JPH0469490A JP H0469490 A JPH0469490 A JP H0469490A JP 2182323 A JP2182323 A JP 2182323A JP 18232390 A JP18232390 A JP 18232390A JP H0469490 A JPH0469490 A JP H0469490A
Authority
JP
Japan
Prior art keywords
sealing material
sealing
cavity
buried pipe
sand
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
Application number
JP2182323A
Other languages
Japanese (ja)
Inventor
Ryuichi Nakamura
隆一 中村
Kiyoutarou Hamano
浜野 郷太郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osaka Gas Co Ltd
Original Assignee
Osaka Gas Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Osaka Gas Co Ltd filed Critical Osaka Gas Co Ltd
Priority to JP2182323A priority Critical patent/JPH0469490A/en
Publication of JPH0469490A publication Critical patent/JPH0469490A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To surely seal the portion to be sealed through only injecting sealing material into the portion by mixing aggregate into the resin material which expands its volume during hardening reaction. CONSTITUTION:Sealing material is made by mixing hydrophilic urethane resin or the like, which is hardened by reaction with water and expands its volume through foaming, and sand or the lie, which serves as aggregate. Mixing ratio of these urethane resin and the sand is, for example, about 1:2 in volume. Water, which contributes to the reaction of the urethane resin, is supplied from water included in the sand by about 3%. Near a gas leakage portion of a buried pipe P such as a gas pipe and the like buried in soil, a hollow space 1 is formed. After the hollow space 1 is formed, a sealing material injecting apparatus 3 is inserted into vertical holes 2, and the sealing material 4 is filled by injecting it into the hollow space 1.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、例えば埋設管のガス漏洩部等をシールするた
めのシール材及びシール方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealing material and a sealing method for sealing, for example, a gas leakage portion of a buried pipe.

〔従来の技術〕[Conventional technology]

従来、上記の如きシール材としては、ウレタン系やエポ
キシ系の硬化性樹脂か用いられていた。そして、かかる
シール材を用いて埋設管をシールするシール方法におい
ては、土中に埋設した埋設管の周囲に空洞部を形成する
と共にその空洞部を密閉した状態で、未硬化で流動性の
あるシール材を空洞部に注入した後、そのシール材が硬
化するまでの間、密閉された空洞部を加圧状態に維持し
ていた(例えば特開平2−85497号公報参照)。
Conventionally, urethane-based or epoxy-based curable resins have been used as the above-mentioned sealing materials. In the sealing method of sealing a buried pipe using such a sealing material, a cavity is formed around the buried pipe buried in the soil, and the cavity is sealed, and an uncured and fluid After the sealant is injected into the cavity, the sealed cavity is maintained under pressure until the sealant hardens (see, for example, Japanese Patent Laid-Open No. 2-85497).

〔発明か解決しようとする課題〕[Invention or problem to be solved]

しかし、上述の如き従来のシール方法においては、前記
空洞部の密閉状態又は加圧操作のいずれか一方を解除す
ると、埋設管内部は正圧となっているため、空洞部に連
通する開口部等、圧力の逃げる部分に向かってシール材
が漏洩流体によって押されて流動し、ガス漏洩部等の充
分なシール効果が得られなくなる虞がある。また、空洞
部を形成する土壌はもともと気密性が悪いため、その空
洞部を加圧状態に維持することか困難でもあった。しか
も、空洞部を密閉し且つ加圧する設備を、前記シール材
か硬化するまで長時間にわたってシールすべき一箇所の
部分に設置しておかなければならないため、シール作業
の能率が低下する欠点かあった。
However, in the conventional sealing method as described above, when either the sealed state of the cavity or the pressurization operation is released, the inside of the buried pipe is under positive pressure, so the opening communicating with the cavity, etc. There is a risk that the sealing material will be pushed by the leaking fluid and flow toward the area where the pressure escapes, making it impossible to obtain a sufficient sealing effect at the gas leakage area. Furthermore, since the soil that forms the cavity originally has poor airtightness, it is difficult to maintain the cavity under pressure. Moreover, equipment for sealing and pressurizing the cavity must be installed in one area for a long period of time until the sealing material hardens, which may reduce the efficiency of the sealing operation. Ta.

本発明の目的は、シールすべき箇所に注入するだけでそ
の箇所を確実にシールすることの可能なシール材及びシ
ール方法を提供することにある。
An object of the present invention is to provide a sealing material and a sealing method that can reliably seal a location by simply injecting it into the location.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するため、本発明にかかるシール材の特
徴構成は、硬化反応に伴って体積膨張する樹脂材に骨材
を混合したことにある。
In order to achieve the above object, the sealing material according to the present invention is characterized in that aggregate is mixed with a resin material that expands in volume as a result of a curing reaction.

一方、本発明にかかるシール方法の特徴手段は、土中に
埋設した埋設管の周囲に空洞部を形成し、その空洞部に
前記シール材を注入した後、硬化させて前記埋設管をシ
ールすることにある。
On the other hand, the characteristic means of the sealing method according to the present invention is to form a cavity around a buried pipe buried in the soil, inject the sealing material into the cavity, and then harden it to seal the buried pipe. There is a particular thing.

尚、本発明を実施するに際しては、前記シール材の成分
としては、前記樹脂材を水との混合により硬化反応する
材料とし、前記骨材を砂としてもよい。
In carrying out the present invention, as components of the sealing material, the resin material may be a material that undergoes a hardening reaction when mixed with water, and the aggregate may be sand.

〔作 用〕 つまり、上記本発明に係るシール材の特徴構成によれば
、前記樹脂材に骨材を混合してあるので、樹脂材の流動
が阻害され、ひいては、シール材全体の流動性か低下す
る。したかって、シールすべき箇所か例え周囲よりも高
圧てあっても、シールすべき箇所近傍のシール材は、そ
の箇所の圧力によって容易に流動することはない。かか
る傾向は、前記シール材の硬化が進むに従って顧著とな
り、しかも、シール材は硬化に伴って体積膨張するので
、空洞部の内壁を反力受けとしてシールすべき箇所はも
とより管の外周面に圧接し、充分密着したまま硬化する
ことになる。
[Function] In other words, according to the characteristic configuration of the sealing material according to the present invention, since aggregate is mixed with the resin material, the flow of the resin material is inhibited, and the fluidity of the entire sealing material is reduced. descend. Therefore, even if the area to be sealed is under a higher pressure than the surrounding area, the sealing material near the area to be sealed will not easily flow due to the pressure at that area. This tendency becomes a problem as the sealing material hardens, and since the sealing material expands in volume as it hardens, it is difficult to apply pressure to the outer circumferential surface of the pipe as well as to the area to be sealed using the inner wall of the cavity as a reaction force. They will be pressed together and cured with sufficient adhesion.

又、上記本発明に係るシール方法の特徴手段によれば、
上記作用によって、シール材自身か埋設管の外周面に密
着したまま硬化するので、埋設管内か正圧であっても、
前記空洞部にシール材を注入した後は、その空洞部を密
閉乃至加圧する必要なく、充分なシール効果を得ること
ができる。
Further, according to the characteristic means of the sealing method according to the present invention,
Due to the above action, the sealing material itself hardens while remaining in close contact with the outer circumferential surface of the buried pipe, so even if there is positive pressure inside the buried pipe,
After the sealant is injected into the cavity, a sufficient sealing effect can be obtained without the need to seal or pressurize the cavity.

尚、前記樹脂材を水との混合により硬化反応する材料と
した場合は、前記空洞部の周囲に存在する土壌中の水分
によりシール材の周囲部から硬化が促進するので、前記
シール材はあたかも硬い外皮で覆われた状態で内側に向
かって体積膨張することとなり、前記埋設管に対するシ
ール材の圧接力をより高めることができる。
In addition, when the resin material is a material that hardens when mixed with water, the moisture in the soil existing around the cavity accelerates the hardening from the peripheral part of the sealing material, so that the sealing material is The sealing material expands inward in volume while being covered with a hard outer skin, and the pressure of the sealing material against the buried pipe can be further increased.

〔発明の効果〕〔Effect of the invention〕

従って、本発明によれば、シールすべき箇所に注入する
だけでその箇所を確実にシールすることの可能なシール
材及びシール方法を提供し得るに至り、その結果、シー
ル作業の効率を向上させることができるようになった。
Therefore, according to the present invention, it has become possible to provide a sealing material and a sealing method that can reliably seal a location by simply injecting it into the location, and as a result, the efficiency of sealing work is improved. Now I can do it.

〔実施例〕〔Example〕

次に本発明の実施例を示す。 Next, examples of the present invention will be shown.

まず、本実施例に用いられるシール材は、水と反応して
硬化すると共に発泡して体積膨張する親水性ウレタン樹
脂と、骨材として機能する砂とを混合してなる。これら
ウレタン樹脂と砂との混合比は、体積比で約1=2であ
る。又、ウレタン樹脂の反応に寄与する水は、主として
前記砂に含まれる3パ一セント程度の含有水分て賄われ
る。
First, the sealing material used in this example is made by mixing a hydrophilic urethane resin that reacts with water to harden and expand in volume by foaming, and sand that functions as an aggregate. The mixing ratio of these urethane resins and sand is approximately 1=2 in terms of volume ratio. Further, the water contributing to the reaction of the urethane resin is mainly provided by the water content of about 3% contained in the sand.

前記ウレタン樹脂の硬化反応式を以下に示す。The curing reaction formula of the urethane resin is shown below.

m0cN RNCO+nH2O→−R−N−C−N R
N−C−N−R+ kCo2↑c=o    c=。
m0cN RNCO+nH2O→-R-N-C-N R
N-C-N-R+ kCo2↑c=o c=.

上記反応式に示されるように、シール材を発泡させてそ
の体積を膨張させるのは、主に硬化反応の過程において
発生する炭酸ガス(CO2)である。
As shown in the above reaction formula, it is mainly carbon dioxide gas (CO2) generated during the curing reaction that causes the sealing material to foam and expand its volume.

次に、上記シール材を用いて、埋設管のガス漏洩部をシ
ールする方法について、第1図(イ)乃至(ハ)及び第
2図に示すグラフを参照しながら説明する。
Next, a method of sealing a gas leakage portion of a buried pipe using the above-mentioned sealing material will be explained with reference to the graphs shown in FIGS. 1(a) to (c) and FIG.

第1図(イ)に示すように、土中に埋設したガス管等の
埋設管(P)のガス漏洩部(図中の断面かガス漏洩部に
相当する。)近傍に、空洞部(1)か形成されている。
As shown in Figure 1 (a), a cavity (1 ) is formed.

この空洞部(1)は、公知のパイプロケータなとで埋設
管(P)の位置を確認した後に、先端ノズルから高速噴
出する水ジェツトで土壌を崩壊させて、地表面から埋設
管(P)にわたる縦穴(2)、 (2)、 (2)を形
成しておき、その後に、かかる縦穴(2)、 (2)、
 (2)を介して水ジェツトによる掘削で形成されたも
のである。尚、埋設管(P)の内部は、ガスによってゲ
ージ圧で約200mmH2Oとなっている。
After confirming the position of the buried pipe (P) using a known pipe locator, the cavity (1) is constructed by collapsing the soil with a water jet ejected at high speed from the tip nozzle, and removing the buried pipe (P) from the ground surface. Vertical holes (2), (2), (2) spanning the length are formed, and then such vertical holes (2), (2),
(2) was formed by excavation using a water jet. Note that the inside of the buried pipe (P) has a gauge pressure of approximately 200 mmH2O due to the gas.

前記空洞部(1)の形成後、第1図(ロ)に示すように
、縦穴(2)、 (2)、 (2)のいずれかにシール
材注入員(3)を挿入して、空洞部(1)にシール材(
4)を加圧注入するのであるか、前記埋設管(P)内の
圧力に対抗するため、注入に用いられる縦穴(2)以外
の縦穴(2)、 (2)は密封しておく。
After forming the cavity (1), as shown in FIG. Seal material (
4) is injected under pressure, and in order to counteract the pressure inside the buried pipe (P), the vertical holes (2) and (2) other than the vertical hole (2) used for injection are sealed.

そして、充填レベル検出具(5)で所定レベルまてシー
ル材(4)か充填されたことを検知した後、シール材(
4)の供給を止める。尚、シール材(4)の供給停止後
、シール材注入具(3)と、充填レベル検出具(5)と
、空洞部(1)に対する密閉具とを撤去するのであるか
、シール材(4)を注入していくと、第2図のグラフに
おける領域(A)に示すように、そのシール材(4)の
水頭分だけ前記埋設管(P)に対するシール材(4)の
圧接力が増大するので、ガス漏洩部に対するシール効果
か不十分となることもない。
After the filling level detector (5) detects that the sealing material (4) is filled to a predetermined level, the sealing material (4) is filled to a predetermined level.
4) Stop the supply. It should be noted that after the supply of the sealant (4) is stopped, the sealant injection tool (3), the filling level detector (5), and the sealing tool for the cavity (1) are removed. ), the pressure of the sealing material (4) against the buried pipe (P) increases by the water head of the sealing material (4), as shown in area (A) in the graph of Figure 2. Therefore, the sealing effect against gas leakage parts will not be insufficient.

第1図(ハ)に示すように、前記空洞部(1)に注入さ
れたシール材(4)の硬化は、空洞部(1)の土壌壁面
に接触する周部(4a)から先に進行する。これは、シ
ール材(4)の砂に含まれる約3パーセントの水分に比
較して、土壌に含まれる水分が約10パーセントと多い
ため、シール材(4)の周部(4a)の硬化反応が促進
されるからである。この硬化の際、前記シール材(4)
は前記砂によって流動性か低下しているので、ガス漏洩
部からシール材(4)に漏洩ガスによる圧力が作用して
も、このシール材(4)か前記縦穴(2)。
As shown in FIG. 1(c), the sealant (4) injected into the cavity (1) hardens first from the peripheral part (4a) that contacts the soil wall surface of the cavity (1). do. This is due to the curing reaction of the peripheral portion (4a) of the sealing material (4) because the soil contains about 10% more water than the sand of the sealing material (4), which contains about 3% water. This is because it promotes During this curing, the sealing material (4)
Since the fluidity of the sealing material (4) has been reduced by the sand, even if the pressure from the leaked gas acts on the sealing material (4) from the gas leakage part, this sealing material (4) or the vertical hole (2).

(2)、 (2)に向かって流動することもなく、ソー
ル材(4)はガス漏洩部に対して充分密着する。
(2), There is no flow toward (2), and the sole material (4) is in close contact with the gas leakage portion.

そして、シール材(4)は硬化に伴って発泡するので、
発泡による体積膨張に起因して、シール材(4)は空洞
部内壁面を反力受けとして埋設管(P)に強力に圧接す
る。この硬化過程における埋設管(P)に対するシール
材(4)の圧接力は、第2図のグラフにおける領域(B
)に示すように、最初は緩慢に増大するか、時間の経過
と共に急激に増大する。
Then, as the sealing material (4) foams as it hardens,
Due to volumetric expansion due to foaming, the sealing material (4) is strongly pressed against the buried pipe (P) using the inner wall surface of the cavity as a reaction force. The pressure contact force of the sealing material (4) against the buried pipe (P) during this curing process is determined by the area (B) in the graph of FIG.
), it increases slowly at first or increases rapidly over time.

そして、シール材(4)の硬化が終了した時点において
は、第2図のグラフにおける領域(C)に示すように、
埋設管(P)に対し、シール材(4)は、非常に大きな
圧接力をもって密着したままの状態を保ち、ガス漏洩部
に対するシール効果が確実に発揮されるのである。
Then, at the time when the sealing material (4) has finished curing, as shown in area (C) in the graph of FIG.
The sealing material (4) remains in close contact with the buried pipe (P) with a very large pressing force, and the sealing effect against the gas leakage portion is reliably exhibited.

〔別実施例〕[Another example]

次に別実施例を説明する。 Next, another embodiment will be described.

(イ)前記シール材(4)に用いる樹脂材とじては、上
述の実施例に用いたウレタン系の樹脂材に限らず、エポ
キシ系等の有機系合成樹脂材や水ガラス等の無機系材料
から適当に選定することかできる。又、反応促進材とし
ては、水に限られるものではない。
(B) The resin material used for the sealing material (4) is not limited to the urethane-based resin material used in the above-mentioned embodiments, but also organic synthetic resin materials such as epoxy resin materials and inorganic materials such as water glass. It is possible to make an appropriate selection from Furthermore, the reaction accelerator is not limited to water.

(0)前記骨材としては、砂に限らず、樹脂材の流動性
を低下させるあらゆる素材を用いることができる。
(0) The aggregate is not limited to sand, but any material that reduces the fluidity of the resin material can be used.

(ハ)前記シール材(4)によりシールすべき対象物は
、前記埋設管(P)に限られるものではなく、板材の継
目やクラック等のシールに用いてもよい。又、シールの
目的は、ガスの漏洩部等を塞ぐのみならず、ガス管等を
補強するものであってもよい。
(c) The object to be sealed with the sealing material (4) is not limited to the buried pipe (P), but may also be used to seal joints, cracks, etc. of plate materials. Further, the purpose of the seal may be not only to close gas leakage portions, but also to reinforce gas pipes and the like.

尚、特許請求の範囲の項に図面との対照を便利にする為
に符号を記すが、該記入により本発明は添付図面の構造
に限定されるものではない。
Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

【図面の簡単な説明】[Brief explanation of drawings]

図面は本発明の実施例を示し、第1図(イ)〜(ハ)は
埋設管周りの土壌の縦断面図、第2図はシール材の注入
ないし硬化過程における、埋設管に対するシール材の圧
接力たるシール圧の変化を示すグラフである。 (P)・・・・・・埋設管、(1)・・・・・・空洞部
、(4)・・・・・・シール材。
The drawings show embodiments of the present invention, and Figures 1 (a) to (c) are longitudinal cross-sectional views of the soil around the buried pipe, and Figure 2 shows the sealing material applied to the buried pipe during the sealing material injection or curing process. It is a graph showing changes in sealing pressure, which is pressure contact force. (P)... Buried pipe, (1)... Cavity, (4)... Sealing material.

Claims (1)

【特許請求の範囲】 1、硬化反応に伴って体積膨張する樹脂材に骨材を混合
してあるシール材。 2、前記樹脂材が水との混合により硬化反応する材料で
あり、前記骨材が砂である請求項1記載のシール材。 3、土中に埋設した埋設管(P)の周囲に空洞部(1)
を形成し、その空洞部(1)に請求項1又は2のいずれ
かに記載のシール材(4)を注入した後、硬化させて前
記埋設管(P)をシールするシール方法。
[Claims] 1. A sealing material in which aggregate is mixed with a resin material that expands in volume as a result of a curing reaction. 2. The sealing material according to claim 1, wherein the resin material is a material that undergoes a hardening reaction when mixed with water, and the aggregate is sand. 3. Hollow area (1) around the buried pipe (P) buried in the soil
3. A sealing method comprising: forming a cavity (1), injecting the sealing material (4) according to any one of claims 1 or 2 into the cavity (1), and curing the sealing material (4) to seal the buried pipe (P).
JP2182323A 1990-07-09 1990-07-09 Sealing material and sealing method Pending JPH0469490A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2182323A JPH0469490A (en) 1990-07-09 1990-07-09 Sealing material and sealing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2182323A JPH0469490A (en) 1990-07-09 1990-07-09 Sealing material and sealing method

Publications (1)

Publication Number Publication Date
JPH0469490A true JPH0469490A (en) 1992-03-04

Family

ID=16116303

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2182323A Pending JPH0469490A (en) 1990-07-09 1990-07-09 Sealing material and sealing method

Country Status (1)

Country Link
JP (1) JPH0469490A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007057061A (en) * 2005-08-26 2007-03-08 Tokyo Gas Co Ltd Jet gas shutoff method and its device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007057061A (en) * 2005-08-26 2007-03-08 Tokyo Gas Co Ltd Jet gas shutoff method and its device

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