JPS61105437A - Detecting method of crack in iron plate laid on concrete layer - Google Patents

Detecting method of crack in iron plate laid on concrete layer

Info

Publication number
JPS61105437A
JPS61105437A JP22689484A JP22689484A JPS61105437A JP S61105437 A JPS61105437 A JP S61105437A JP 22689484 A JP22689484 A JP 22689484A JP 22689484 A JP22689484 A JP 22689484A JP S61105437 A JPS61105437 A JP S61105437A
Authority
JP
Japan
Prior art keywords
concrete layer
detection
crack
gas
pipe
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
JP22689484A
Other languages
Japanese (ja)
Inventor
Masahiko Ozaki
尾崎　正彦
Mitsuhiro Sakamoto
光弘 坂本
Toshio Yasuda
俊夫 安田
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.)
IHI Corp
Original Assignee
IHI Corp
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 IHI Corp filed Critical IHI Corp
Priority to JP22689484A priority Critical patent/JPS61105437A/en
Publication of JPS61105437A publication Critical patent/JPS61105437A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

PURPOSE:To easily detect a crack in an iron plate by inserting an injection pipe into the concrete layer at one side of an iron plate and injecting detection gas, and sucking the detection gas through a detection pipe inserted into the concrete layer at the other side. CONSTITUTION:The injection pipe 8 which has numbers of holes 9 lengthwise is inserted into the heat insulation concrete layer 4 on the bottom plate 3 of the external tank 2 of a low-temperature tank. Then, the detection pipe 10 which has an opening 11 atop is provided in the base concrete 1 under the bottom plate 3 in a movable state and a gas detector 12 is connected to its rear end. The detection gas such as freon is injected into the concrete layer 4 from the injection pipe 8, and then if a crack is present in the bottom plate 3, the detection gas leaks to the side of the base concrete layer 1 through the crack and is therefore sucked into the detection pipe 10 from the opening 11; and the gas is detected by the detector 12 and the detection pipe 10 is moved as shown by an arrow to detect the position of the crack accurately and easily.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は低温タンクの外槽底板のように両側がコンクリ
ート層で覆われた鉄板のクラック検出方法に関し、特に
コンクリート層を取り除かずにそのままの状態で鉄板の
割れを検知できるコンクリート層に介設された鉄板のク
ラック検出方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for detecting cracks in a steel plate whose both sides are covered with a concrete layer, such as the outer tank bottom plate of a low-temperature tank. The present invention relates to a method for detecting cracks in a steel plate interposed in a concrete layer, which can detect cracks in the steel plate under the conditions.

［従来の技術］ 従来タンク底板などの溶接洩れ検査や穴あき。[Conventional technology] Inspection of weld leaks and holes in conventional tank bottom plates, etc.

クラック検査などは種々の検査方法が知られている。Various inspection methods such as crack inspection are known.

例えば放射線検査や浸透液検査或はバキュームテストな
ど種々の検査があり、これにより底板の溶接洩れや腐蝕
、穴あき２割れ、クラックなどを検査している。For example, there are various inspections such as radiographic inspection, penetrating liquid inspection, and vacuum test, which are used to inspect the bottom plate for weld leakage, corrosion, holes, cracks, etc.

［発明が解決しようとする問題点］ しかしながら、これら検査は上部が開放し目視できる状
態では有効であるが、低温タンクの外槽底板など、その
上下がコンクリート層で覆われるような場合には用いる
ことができない。[Problems to be Solved by the Invention] However, these inspections are effective when the top is open and visible, but they are used when the top and bottom of the bottom plate of a low-temperature tank is covered with a concrete layer. I can't.

［発明の目的］ 本発明は上記事情を考鑵してなされたもので、両側がコ
ンクリート層で覆われた鉄板に生じた割れなどのクラッ
クを、そのままの状態で検知できるコンクリート層に介
設された鉄板のクラック検出方法を提供することを目的
とする。[Object of the Invention] The present invention has been made in consideration of the above-mentioned circumstances, and is based on a method for detecting cracks, such as cracks, that occur in a steel plate covered with concrete layers on both sides. The purpose of this invention is to provide a method for detecting cracks in iron plates.

［発明の概要］ 本発明は、上記目的を達成するために、両側がコンクリ
ート層で覆われた鉄板のクラック検出方法において、そ
の一側のコンクリート層内に、その長手方向に沿って孔
を有する注入パイプを挿入してコンクリート層内にフロ
ン等の検知ガスを注入すると共に他側のコンクリート層
内に先端部が開口された検知パイプを挿入し、上記鉄板
から漏洩する検知ガスを検知パイプで吸入して鉄板の割
れを検知するようにしたことを特徴とするもので、コン
クリートは若干の通気性を有するため、その一側のコン
クリート層内に注入された検知ガスはコンクリート層か
ら鉄板に流れ、鉄板にクラックが生じていた場合には、
そのクラックから他側のコンクリート層に漏洩するため
、これを検知パイプで吸引して検知ガスの有無を検出す
ることにより容易に鉄板の割れを検出できるようにした
ものである。[Summary of the Invention] In order to achieve the above object, the present invention provides a method for detecting cracks in a steel plate covered with concrete layers on both sides, in which holes are formed in the concrete layer on one side along the longitudinal direction. Insert an injection pipe to inject a detection gas such as fluorocarbon into the concrete layer, and at the same time insert a detection pipe with an open end into the concrete layer on the other side, and inhale the detection gas leaking from the steel plate through the detection pipe. Since concrete has some permeability, the detection gas injected into the concrete layer on one side flows from the concrete layer to the iron plate. If there are cracks in the iron plate,
Since the gas leaks from the crack into the concrete layer on the other side, cracks in the steel plate can be easily detected by sucking this gas through a detection pipe and detecting the presence or absence of the detection gas.

［実施例］ 以］・本発明に係るコンクリート層に介設された鉄板の
クラック検出方法の好適一実施例を添付図面に基づいて
説明する。[Embodiment] - A preferred embodiment of the method for detecting cracks in a steel plate interposed in a concrete layer according to the present invention will be described with reference to the accompanying drawings.

添付図面はＬＮＧ、ＬＰＧなどの低温液体を収容する低
温タンクに本発明を実施した例を示し、低温タンクは、
基礎コンクリ−１・層１上に鉄製の外槽２が設置され、
その外槽２の底板３上に断熱コンクリートＭ４を介して
ｌ−Ｎ　Ｇ　、　Ｌ　Ｐ　Ｇ　’にどの低温液体５を収
容する内栖６が設置され、その内槽６ど外槽２間にパー
ライト粒などの断熱材７が充填さ°れて低温タンクが構
築される。The attached drawings show an example in which the present invention is implemented in a low-temperature tank that accommodates low-temperature liquids such as LNG and LPG, and the low-temperature tank is
An iron outer tank 2 is installed on the foundation concrete layer 1 and layer 1.
On the bottom plate 3 of the outer tank 2, an inner tank 6 for storing the low-temperature liquid 5 for l-NG, LPG' is installed via a heat insulating concrete M4, and perlite is placed between the inner tank 6 and the outer tank 2. The cryogenic tank is constructed by filling with a heat insulating material 7 such as grains.

次にこの外槽２の底板３、りなわち両側がコンクリート
ＩＩ！１１．４で覆われた鉄板の割れを検出する方法を
説明する。Next, the bottom plate 3 of this outer tank 2, that is, both sides are concrete II! 11.4 The method for detecting cracks in a covered steel plate will be explained.

先ず鉄板である外槽２の底板３上の断熱コンクリート層
４内に、ぞの長手方向に沿って注入パイプ８が挿入され
る。この注入パイプ８は、その長手方向に多数の孔９を
有し、例えば断熱コンクリート貧・１４にコンクリート
ドリル等で孔を穿け、その孔に挿入するように設け”Ｃ
も或は断熱コンクリートＪＩ４の打設時に予め設けるよ
うにしてもよい。First, the injection pipe 8 is inserted into the heat insulating concrete layer 4 on the bottom plate 3 of the outer tank 2, which is a steel plate, along its longitudinal direction. This injection pipe 8 has a large number of holes 9 in its longitudinal direction, and is inserted into the hole by drilling a hole in the insulation concrete 14 with a concrete drill or the like.
Alternatively, it may be provided in advance when placing the heat insulating concrete JI4.

また注入パイプ８は底板３に亘って広く分布するよう複
数本設けるようにする。Further, a plurality of injection pipes 8 are provided so as to be widely distributed over the bottom plate 3.

また底板３下の基礎コンクリート層１には検知パイプ１
０が設けられる。この検知パイプ１０は基礎コンクリー
トドリル内に孔を穿け、その孔に沿って検知パイプ１０
を出入できるようにしても或は底板３を基礎コンクリー
ト１１１上に支持するアンカーボルト（図示せず）を緩
めてその底板３と基礎コンクリート１Ｉｉ１間に検知パ
イプ１０を挿入するようにしてもよい。検知パイプ１０
の先端部は開口１１を有し、その後端にはガス検出器１
２が接続される。In addition, a detection pipe 1 is installed in the foundation concrete layer 1 under the bottom plate 3.
0 is set. This detection pipe 10 is made by drilling a hole in the foundation concrete drill, and running the detection pipe 10 along the hole.
Alternatively, the detection pipe 10 may be inserted between the bottom plate 3 and the foundation concrete 1Ii1 by loosening anchor bolts (not shown) that support the bottom plate 3 on the foundation concrete 111. Detection pipe 10
has an opening 11 at its tip, and a gas detector 1 at its rear end.
2 is connected.

以上において底板３のクラックを検出するには、先ず注
入パイプ８に、フロン、ＮＨ３，ヘリウム等の検知ガス
を供給し、その検知ガスを注入パイプ８の孔９から断熱
コンクリート層４内に注入する。In order to detect cracks in the bottom plate 3 in the above, first, a detection gas such as fluorocarbon, NH3, helium, etc. is supplied to the injection pipe 8, and the detection gas is injected into the insulating concrete layer 4 through the hole 9 of the injection pipe 8. .

断熱コンクリート１１４は若干の通気性を有するためコ
ンクリート層４内を検知ガスが流れ、そのガスが底板３
上に達するにおいてでの底板３にクラックが発生してい
る場合、そのクラックを通じて検知ガスが基礎コンクリ
−ｔ−１？４１側に漏洩する。Since the insulating concrete 114 has some air permeability, the detection gas flows through the concrete layer 4, and the gas flows through the bottom plate 3.
If a crack occurs in the bottom plate 3 when reaching the top, the detected gas leaks to the foundation concrete t-1?41 side through the crack.

この漏洩した検知ガスが、検知パイプ１０の先端の開口
１１から検知パイプ１０内に流れ、ガス検知器１２でそ
のガスを検知して底板３のクラックの有無を検知する。This leaked detection gas flows into the detection pipe 10 from the opening 11 at the tip of the detection pipe 10, and the gas detector 12 detects the gas to detect the presence or absence of cracks in the bottom plate 3.

この場合、検知パイプ１０を図示の矢印のように動かす
ことで底板３に生じたクラックの個所を正確に判断する
ことができる。また、漏洩する検知ガスの量が少ない場
合、ガス検知器１２に吸引装置を設け、検知ガスを強制
的に吸引することで、より確実な検知が可能となる。In this case, by moving the detection pipe 10 in the direction of the illustrated arrow, the location of the crack that has occurred in the bottom plate 3 can be accurately determined. Furthermore, when the amount of leaked detection gas is small, more reliable detection can be achieved by providing a suction device in the gas detector 12 and forcibly sucking the detection gas.

以」：において底板３のクラック発生個所が検出できた
ならば、適宜の手段でそのクラックの補修を行う。If the location where a crack has occurred in the bottom plate 3 is detected, the crack is repaired by appropriate means.

尚上述の実施例においてはコンクリート層に介在される
鉄板として低温タンクの外槽底板の例で説明したが、低
温タンクのみならず鉄板がコンクリ−１・層間に介設さ
れるものであればいかなるものにも適用できることは勿
論である。In the above embodiment, the outer tank bottom plate of a low-temperature tank was used as an example of the iron plate interposed in the concrete layer, but any iron plate can be used as long as the iron plate is interposed between the concrete layer and the concrete layer. Of course, it can also be applied to things.

［発明の効果］ 以上詳述してきたことから明らかなように本発明によれ
ば次のごとき優れた効果を発揮する。[Effects of the Invention] As is clear from the detailed description above, the present invention exhibits the following excellent effects.

（１）　　鉄板の一鱈のコンクリート層内に注入パイプ
を設け、他側のコンクリート図に検知パイ′プを設け、
その注入パイプから検知ガスを注入してそれを検知パイ
プで検知することにより、鉄板のクラックを容易に検知
することができる。(1) Install an injection pipe in the concrete layer on one side of the iron plate, and install a detection pipe in the concrete layer on the other side.
By injecting a detection gas through the injection pipe and detecting it with the detection pipe, cracks in the iron plate can be easily detected.

（２）　　注入パイプと検知パイプを夫々コンクリート
層に挿入するだけなので、鉄板がそのままの状態でも検
知でき、その鉄板の欠陥の有無を確認できる。(2) Since the injection pipe and the detection pipe are simply inserted into the concrete layer, detection can be performed even when the steel plate is in its original state, and the presence or absence of defects in the steel plate can be confirmed.

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

図面は本発明に係るコンクリート層に介設された鉄板の
クラック検出方法を低温タンクに実施した例を示す要部
断面図である。 図中、１は基礎コンクリート層、３は鉄板である底板、
４は断熱コンクリート層、８は注入バーＣプ、１０は検
知パイプ、１２はガス検知器である。The drawing is a sectional view of a main part showing an example in which the method for detecting cracks in a steel plate interposed in a concrete layer according to the present invention is applied to a low temperature tank. In the figure, 1 is the foundation concrete layer, 3 is the bottom plate which is a steel plate,
4 is a heat insulating concrete layer, 8 is an injection bar C, 10 is a detection pipe, and 12 is a gas detector.

Claims (1)

【特許請求の範囲】[Claims] 両側がコンクリート層で覆われた鉄板のクラック検出方
法において、その一側のコンクリート層内に、その長手
方向に沿って孔を有する注入パイプを挿入してコンクリ
ート層内にフロン等の検知ガスを注入すると共に他側の
コンクリート層内に先端部が開口された検知パイプを挿
入し、上記鉄板から漏洩する検知ガスを検知パイプで吸
入して鉄板の割れを検知するようにしたことを特徴とす
るコンクリート層に介設された鉄板のクラック検出方法
。In a crack detection method for a steel plate covered with concrete layers on both sides, an injection pipe with holes along the length is inserted into the concrete layer on one side, and a detection gas such as fluorocarbon is injected into the concrete layer. At the same time, a detection pipe with an open end is inserted into the concrete layer on the other side, and cracks in the steel plate are detected by sucking in detection gas leaking from the steel plate through the detection pipe. A method for detecting cracks in steel plates interposed in layers.
JP22689484A 1984-10-30 1984-10-30 Detecting method of crack in iron plate laid on concrete layer Pending JPS61105437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22689484A JPS61105437A (en) 1984-10-30 1984-10-30 Detecting method of crack in iron plate laid on concrete layer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22689484A JPS61105437A (en) 1984-10-30 1984-10-30 Detecting method of crack in iron plate laid on concrete layer

Publications (1)

Publication Number Publication Date
JPS61105437A true JPS61105437A (en) 1986-05-23

Family

ID=16852249

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22689484A Pending JPS61105437A (en) 1984-10-30 1984-10-30 Detecting method of crack in iron plate laid on concrete layer

Country Status (1)

Country Link
JP (1) JPS61105437A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0597229A1 (en) * 1992-09-30 1994-05-18 R+T UMWELT GmbH Procedure and device for detecting leaks in open containers
DE102017004776A1 (en) * 2017-05-17 2018-11-22 Wolfgang Böttcher Method for testing the tightness of reinforced concrete tanks and reinforced concrete tanks for carrying out the method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0597229A1 (en) * 1992-09-30 1994-05-18 R+T UMWELT GmbH Procedure and device for detecting leaks in open containers
DE102017004776A1 (en) * 2017-05-17 2018-11-22 Wolfgang Böttcher Method for testing the tightness of reinforced concrete tanks and reinforced concrete tanks for carrying out the method

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