JPS63134930A - Method for detecting damaged part of underground buried pipe - Google Patents
Method for detecting damaged part of underground buried pipeInfo
- Publication number
- JPS63134930A JPS63134930A JP28108786A JP28108786A JPS63134930A JP S63134930 A JPS63134930 A JP S63134930A JP 28108786 A JP28108786 A JP 28108786A JP 28108786 A JP28108786 A JP 28108786A JP S63134930 A JPS63134930 A JP S63134930A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- underground
- pipe
- detecting
- damaged part
- 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
Links
- 238000000034 method Methods 0.000 title claims description 14
- 239000007789 gas Substances 0.000 claims abstract description 86
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 27
- 239000001307 helium Substances 0.000 claims abstract description 19
- 229910052734 helium Inorganic materials 0.000 claims abstract description 19
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims description 21
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract 1
- 238000009412 basement excavation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- LPLLVINFLBSFRP-UHFFFAOYSA-N 2-methylamino-1-phenylpropan-1-one Chemical compound CNC(C)C(=O)C1=CC=CC=C1 LPLLVINFLBSFRP-UHFFFAOYSA-N 0.000 description 1
- 241000132539 Cosmos Species 0.000 description 1
- 235000005956 Cosmos caudatus Nutrition 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002371 helium Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的コ
（産業上の利用分野）
本発明は、トレーサーガスを用いた地中埋設管の損傷部
探知方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Industrial Application Field) The present invention relates to a method for detecting damaged parts of underground pipes using tracer gas.
（従来の技術）
現在、都市地中空間はガス、水道、電線、通信管等の各
種の地中埋設管によって高度に過密化している。そして
、これらの地中埋設管は経年変化によって、劣化や腐蝕
等により損耗し破孔やひびわれ等の欠陥が生じて、修理
や取替え等の補修工事が必要となってくる。(Prior Art) Currently, underground urban spaces are highly congested due to various underground pipes such as gas, water, electric lines, and communication pipes. As these underground pipes deteriorate over time, they wear out due to deterioration, corrosion, etc., and defects such as holes and cracks occur, necessitating repair work such as repair or replacement.
従来、このような地中埋設管の損傷部の探知は、損傷部
の有ると思われる区間を掘削して、埋設管の損傷部を確
認することにより行なわれていた。Conventionally, such a damaged section of an underground pipe has been detected by excavating a section where the damaged section is thought to exist and confirming the damaged section of the underground pipe.
（発明が解決しようとする問題点）
しかしながらこのような探知方法では、広い面積にわた
って大掛かりに埋設管を掘り起す必要があり、確認作業
のみでも時間と費用を多く要するという雑煮があった。(Problems to be Solved by the Invention) However, with this detection method, it is necessary to excavate buried pipes over a large area, and the confirmation work alone requires a lot of time and money.
そこで地中埋設管の損傷部の補修工事を最低限度の掘削
で行なえろように、確実な損傷部の探知方法が強く求め
られていた。Therefore, there is a strong need for a reliable method of detecting damaged parts of underground pipes so that repair work can be carried out with a minimum amount of excavation.
本発明はこのような問題点を解決するた′めになされた
もので、大掛かりな掘削をすることなく、簡単で確実に
かつ安全に地中埋設管の損傷部を探知する方法を提供す
ることを目的とする。The present invention has been made to solve these problems, and provides a method for easily, reliably, and safely detecting damaged parts of underground pipes without extensive excavation. With the goal.
［発明の構成］
（問題点を解決するだめの手段）
本発明の地中埋設管の損傷部探知方法は、地中埋設管内
にトレーサーガスを充填し、前記地中埋設管の布設路に
沿って複数のガス採取用パイプを打込み、これらのガス
採取用パイプを介して前記地中埋設管の損傷部より漏洩
した前記トレーサーガスを検出し、前記各ガス採取用パ
イプにおける前記トレーサーガスの検出時刻または各ガ
ス採取用パイプ間の濃度分布から前記地中埋設管の損傷
位置を求めることを特徴としている。[Structure of the Invention] (Means for Solving the Problems) The method for detecting damaged parts of underground pipes according to the present invention is to fill tracer gas into the underground pipes, and to detect the damaged parts along the installation path of the underground pipes. The tracer gas leaked from the damaged part of the underground pipe is detected through these gas sampling pipes, and the detection time of the tracer gas in each gas sampling pipe is determined. Alternatively, the damaged position of the underground pipe is determined from the concentration distribution between each gas sampling pipe.
本発明に使用されるトレーサーガスとしては、地中埋設
管の損傷部から地中内を上方にすばやく拡散させるため
に、大気より軽いガスであることが好ましく、例えば大
気より軽くかつ不活性なへ゛リウムガス（比重−０，１
４）が適している。また、このヘリウムガスは高感度に
検知が可能なので、経済性の点で窒素ガス等の不活性な
ガスをキャリアガスとして多量に混合したものを用いる
こともできる。The tracer gas used in the present invention is preferably a gas that is lighter than the atmosphere, such as helium gas, which is lighter than the atmosphere and inert, in order to quickly diffuse upward through the underground from the damaged part of the underground pipe. (Specific gravity -0,1
4) is suitable. Moreover, since this helium gas can be detected with high sensitivity, from the viewpoint of economy, it is also possible to use a mixture of a large amount of an inert gas such as nitrogen gas as a carrier gas.
またトレーサーガスを地中埋設管内全体へ均一に充填す
る方法としては、例えばまず地中埋設管の一方の端部よ
りトレーサーガスを送入し、同時に他方の端部より吸引
して吸引側の端°部にトレーサーガスが行渡ったことを
確認し、しかる後吸引側の端部を封止して、さらに圧入
することにより行う方法が適している。In addition, as a method to uniformly fill the entire underground pipe with tracer gas, for example, first, tracer gas is introduced from one end of the underground pipe, and at the same time, the tracer gas is sucked from the other end. A suitable method is to confirm that the tracer gas has spread to the part, then seal the end on the suction side, and further press-fit it.
本発明の探知方法は、ガス管、水道管、電線管、通信管
等の各種地中埋設管の損傷部の探知に適用することがで
きる。The detection method of the present invention can be applied to detecting damaged parts of various underground pipes such as gas pipes, water pipes, electric conduit pipes, and communication pipes.
（作 用）
本発明の探知方法においては、地中埋設管に破孔やひび
われ箇所等の損傷部が有ると、この損傷部よりトレーサ
ーガスが上方へ楕円球状に拡散し、したがって損傷部位
置に最も近いガス採集用パイプに最初に検出される０次
に２番目、３番目にこのトレーサーガスを検知した時刻
および２番目、３番目に検知したガス採取用パイプの位
置から、おおよその損傷部の位置を確認することができ
る。また検知されたトレーサーガスの濃度は時間ととも
に高くなっていくので、複数のガス採取用パイプによる
ほぼ同時刻における各パイプ間の濃度分布からもおおよ
その損傷部の（ｉ置を確認することができる。(Function) In the detection method of the present invention, if there is a damaged part such as a hole or a crack in an underground pipe, the tracer gas will diffuse upward from this damaged part in an elliptical shape, and will therefore be located at the damaged part. From the time when this tracer gas was first detected at the nearest gas sampling pipe, the second and third detections, and the position of the second and third gas sampling pipes, the approximate location of the damage was determined. You can check the location. In addition, since the concentration of the detected tracer gas increases over time, it is possible to confirm the approximate position of the damaged area from the concentration distribution between multiple gas sampling pipes at approximately the same time. .
（実施例）
次に本発明の方法を用いて、熱供給導管の損傷部を調査
した一実施例について図面を用いて詳細に説明する。(Example) Next, an example in which a damaged portion of a heat supply conduit was investigated using the method of the present invention will be described in detail with reference to the drawings.
まず、第１図に示すように、埋設管１の損傷箇所の有無
を確認するために、埋設管１の調査しようとする一定区
間を閉鎖系として、一方よりコンプレッサ２によりエア
ーを圧入する。そして圧力計３の示度の低下によりエア
ー漏れの確認をする。First, as shown in FIG. 1, in order to confirm whether or not there is any damage to the buried pipe 1, a certain section of the buried pipe 1 to be investigated is closed, and air is forced into it by the compressor 2 from one side. Air leakage is then confirmed by a decrease in the reading of the pressure gauge 3.
損傷箇所の有ることを確認した後、埋設管１に沿って地
表面にマーキングを行い、さらにその上にガス採取用パ
イプ５を打ち込むためのコアボーリング孔４を設ける位
置を一定間隔毎にマーキングする。After confirming that there are any damaged areas, marks are made on the ground surface along the buried pipe 1, and furthermore, the positions where the core boring holes 4 for driving the gas extraction pipes 5 are to be installed are marked at regular intervals. .
なおこの時に、事前に調査した他の埋設物や構造物の位
置もマーキングしておく。At this time, also mark the positions of other buried objects and structures that have been surveyed in advance.
次に、このコアボーリング孔４用のマーキングに従って
コアボーリングを行い、このコアボーリング孔４にガス
採取用パイプ５を打込む、この際打ち込み時に他の埋設
物に損傷を与えないように留意する。このガス採取用パ
イプ５としては、例えば第２図に示すように３／４ ｉ
ｎ程度のパイプにガス採取用の直径６１１程度の穴を複
数個設け、頂部には第３図に示すような打込み兼引抜き
用治具１１をセットして打込みを行う、そして第５図に
示すように長生キャップ１３を使用してコアボーリング
孔４の蓑虫を行う、なお第４図において１２は作業終了
時にガス採取用パイプ５を引抜く時に用いる治具を示し
ている。Next, core boring is performed according to the markings for the core borehole 4, and the gas extraction pipe 5 is driven into the core borehole 4, with care being taken not to damage other buried objects when driving. For example, as shown in FIG. 2, the gas sampling pipe 5 is 3/4 i
A plurality of holes with a diameter of about 611 mm for gas sampling are provided in a pipe of about The core borehole 4 is cleaned using the long cap 13 as shown in FIG.
次にトレーサーガスとして、ヘリウムガスに窒素ガスを
十分に混合したものを用いて、埋設管１内に充填する。Next, the buried pipe 1 is filled with a mixture of helium gas and nitrogen gas as a tracer gas.
なおヘリウムガスと窒素ガスとの混合比率は、容量比で
１０：９０〜３０：７０の範囲が適正なデータが得られ
かつ経済的である。Note that a mixing ratio of helium gas and nitrogen gas in a range of 10:90 to 30:70 in terms of volume ratio is economical and provides appropriate data.
このトレーサーガスの充填はヘリウムガス６と窒素ガス
７をガス混合装置８を用いて十分に混合しながら、埋設
管１の一方の端部１ａより送入しながら他方の端部１ｂ
より真空ポンプ９で吸引し；吸引側の端部１ｂにトレー
サーガスが到達したことを確認してから吸引側の端部を
密閉して、さらにトレーサーガスを圧入する。This tracer gas is filled with helium gas 6 and nitrogen gas 7 while being thoroughly mixed using a gas mixer 8, while being fed from one end 1a of the buried pipe 1 to the other end 1b.
After confirming that the tracer gas has reached the end 1b on the suction side, the end on the suction side is sealed, and further tracer gas is pressurized.
そして、例えばＸＰ−３１４改良型（新コスモス電気ｖ
Ａ製、商品名）のようなヘリウムガス専用の簡易ガス検
知器を用いて、混合ガス充填開始時より一定時間毎（例
えば５公庫）に各ガス４ＡＪＩ！用パイプ５より埋設ｇ
１の損傷箇所Ａより漏洩するヘリウムガスＢの検出を行
い、経時的にこの濃度を記録する。なお、トレーサーガ
スを埋設管１内に充填する前に、自然状態でのヘリウム
ガスの濃度を測定しておく。For example, the improved XP-314 (New Cosmos Electric V
Using a simple gas detector exclusively for helium gas such as A (trade name), test 4AJI of each gas at regular intervals (for example, 5 public collections) from the start of mixed gas filling. buried from pipe 5
Detection of helium gas B leaking from damaged location A of No. 1 is performed, and this concentration is recorded over time. Note that before filling the buried pipe 1 with tracer gas, the concentration of helium gas in its natural state is measured.
そして、ヘリウムガス濃度の測定完了後コンプレッサ２
により埋設管１内の残留ガスの排出を行う。After the helium gas concentration measurement is completed, the compressor 2
The residual gas inside the buried pipe 1 is discharged.
測定終了後、各ガス採取用パイプ５におけるヘリウムガ
スの検出時刻、経時的な濃度分布データまたはこの両者
より埋設管１の損傷箇所Ａを判定する。ずなわち、例え
ばまずガス採取用パイプＰｎにヘリウムガスが検出され
、さらにヘリウムガスが拡散し、図中点線で示すヘリウ
ムガスの検出限界がガス採取用パイプＰ ｎ−１に接し
た時点でＰ ｎ−１に検出され、さらにガス採取用パイ
プＰｎｅ１で検出されたとすれば、損傷箇所はガス採取
用パイプＰｎとＰ ｎ−１間でＰｎに近い位置にあるこ
とがわかる。また各ガス採取用パイプの経時的な濃度分
布の差により、これをさらに確実に判定することができ
る。After the measurement is completed, the damaged location A of the buried pipe 1 is determined based on the detection time of helium gas in each gas sampling pipe 5, the temporal concentration distribution data, or both. That is, for example, helium gas is first detected in the gas sampling pipe Pn, and then the helium gas further diffuses until the helium gas detection limit shown by the dotted line in the figure touches the gas sampling pipe Pn-1. If it is detected at gas sampling pipe Pne1 and further detected at gas sampling pipe Pne1, it can be seen that the damaged location is located between gas sampling pipes Pn and Pn-1 and close to Pn. Further, this can be determined more reliably based on the difference in the concentration distribution over time of each gas sampling pipe.
また、トレーサーガスを地中埋設管内に充Ｊｊ！後、一
定時間経過させてから同時に各ガス採取用パイプより漏
洩ガス濃度の測定を行うようにしてもこの濃度分布から
損傷箇所を判定することが可能である。In addition, tracer gas is charged into underground pipes! Even if the leaked gas concentration is measured from each gas sampling pipe at the same time after a certain period of time has elapsed, it is possible to determine the damaged location from this concentration distribution.
［発明の効果］
以上説明したように本発明の地中埋設管の損傷部探知方
法によれば、損傷部より漏洩するトレーサーガスの地中
内の拡散を利用して、この漏洩ガスの検出時刻または濃
度分布により、広範囲に掘削することなく地中埋設管の
損傷箇所の確認が簡単で確実にかつ安全に行なうことが
できる。[Effects of the Invention] As explained above, according to the method for detecting a damaged part of an underground pipe of the present invention, the detection time of this leaked gas is determined by utilizing the underground diffusion of the tracer gas leaking from the damaged part. Alternatively, due to the concentration distribution, it is possible to easily, reliably, and safely confirm damaged locations in underground pipes without having to excavate a wide area.
第１図は本発明の一実施例の調査現場を概念的に示した
平面図と断面図、第２図、第３図および第４図は本発明
の一実施例に用いたガス採取用パイプ、ガス採取用パイ
プ用打込み兼引抜き治具およびガス採取用パイプ用引抜
き治具、第５図は本発明の一実施例の調査現場のコアボ
ーリング孔部を拡大した断面図である。
１・・・・・・・・・埋設管
２・・・・・・・・・コンプレッサ
４・・・・・・・・・コアボーリング孔５・・・・・・
・・・ガス採取用バイブロ・・・・・・・・・ヘリウム
ガス
７・・・・・・・・・窒素ガス
８・・・・・・・・・ガス混合装置
９・・・・・・・・・真空ポンプ
１０・・・・・・・・・ヘリウムガス検知器出願人
株式会社北海道熱供給公社同 北海道熱供
給メンテナンス株式会社
同 鹿島建設株式会社
同 株式会社テクノFigure 1 is a plan view and cross-sectional view conceptually showing an investigation site according to an embodiment of the present invention, and Figures 2, 3, and 4 are gas sampling pipes used in an embodiment of the present invention. FIG. 5 is an enlarged sectional view of a core boring hole portion at an investigation site according to an embodiment of the present invention. 1... Buried pipe 2... Compressor 4... Core boring hole 5...
...Vibro for gas collection...Helium gas 7...Nitrogen gas 8...Gas mixing device 9... ...Vacuum pump 10...Helium gas detector applicant
Hokkaido Heat Supply Corporation Hokkaido Heat Supply Maintenance Co., Ltd. Kajima Construction Co., Ltd. Techno Co., Ltd.
Claims (5)
中埋設管の布設路に沿って複数のガス採取用パイプを打
込み、これらのガス採取用パイプを介して前記地中埋設
管の損傷部より漏洩した前記トレーサーガスを検出し、
前記各ガス採取用パイプにおける前記トレーサーガスの
検出時刻または各ガス採取用パイプ間の濃度分布から前
記地中埋設管の損傷位置を求めることを特徴とする地中
埋設管の損傷部探知方法。(1) Fill the underground pipe with tracer gas, drive a plurality of gas sampling pipes along the installation path of the underground pipe, and prevent damage to the underground pipe through these gas sampling pipes. detecting the tracer gas leaking from the
A method for detecting a damaged part of an underground pipe, characterized in that a damaged position of the underground pipe is determined from the detection time of the tracer gas in each of the gas sampling pipes or the concentration distribution between the gas sampling pipes.
許請求の範囲第１項記載の地中埋設管の損傷部探知方法
。(2) The method for detecting a damaged part of an underground pipe according to claim 1, wherein the tracer gas is a gas having a lighter specific gravity than the atmosphere.
合ガスである特許請求の範囲第１項または第２項記載の
地中埋設管の損傷部探知方法。(3) The method for detecting damaged parts of underground pipes according to claim 1 or 2, wherein the tracer gas is a mixed gas of helium gas and nitrogen gas.
１０：９０〜３０：７０の範囲である特許請求の範囲第
３項記載の地中埋設管の損傷部探知方法。(4) The method for detecting damaged parts of underground pipes according to claim 3, wherein the mixing ratio of helium gas and nitrogen gas is in the range of 10:90 to 30:70 in terms of volume ratio.
送入しながら他方の端部より吸引した後、他方の端部を
閉鎖して地中埋設管内に圧入される特許請求の範囲第１
項ないし第４項のいずれか１項記載の地中埋設管の損傷
部探知方法。(5) The scope of the claim that the tracer gas is introduced from one end of the underground pipe and sucked from the other end, and then the other end is closed and pressurized into the underground pipe. 1st
A method for detecting a damaged part of an underground pipe according to any one of paragraphs 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28108786A JPS63134930A (en) | 1986-11-26 | 1986-11-26 | Method for detecting damaged part of underground buried pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28108786A JPS63134930A (en) | 1986-11-26 | 1986-11-26 | Method for detecting damaged part of underground buried pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63134930A true JPS63134930A (en) | 1988-06-07 |
Family
ID=17634151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28108786A Pending JPS63134930A (en) | 1986-11-26 | 1986-11-26 | Method for detecting damaged part of underground buried pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63134930A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0380354A2 (en) * | 1989-01-26 | 1990-08-01 | Tracer Research Corporation | Underground pipe leak detection system |
| JPH0643065A (en) * | 1992-07-23 | 1994-02-18 | Sanii:Kk | Water leakage detecting method for embedded pipe |
| JP2007225402A (en) * | 2006-02-22 | 2007-09-06 | Nichias Corp | Gas detection needle |
| JP2011043524A (en) * | 2010-12-03 | 2011-03-03 | Nichias Corp | Gas detection needle and gas detection method |
| JP2011137652A (en) * | 2009-12-25 | 2011-07-14 | Enviro Tech International Inc | Method for inspecting breakage of underground buried object |
| JP2013075277A (en) * | 2011-09-30 | 2013-04-25 | Tokyo Gas Co Ltd | Leakage inspection gas mixer of buried pipeline, and leakage inspection method of buried pipeline |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS556039A (en) * | 1978-06-27 | 1980-01-17 | Sumitomo Electric Ind Ltd | Leack point detection method for burried tubular body |
-
1986
- 1986-11-26 JP JP28108786A patent/JPS63134930A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS556039A (en) * | 1978-06-27 | 1980-01-17 | Sumitomo Electric Ind Ltd | Leack point detection method for burried tubular body |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0380354A2 (en) * | 1989-01-26 | 1990-08-01 | Tracer Research Corporation | Underground pipe leak detection system |
| JPH0643065A (en) * | 1992-07-23 | 1994-02-18 | Sanii:Kk | Water leakage detecting method for embedded pipe |
| JP2007225402A (en) * | 2006-02-22 | 2007-09-06 | Nichias Corp | Gas detection needle |
| JP4729414B2 (en) * | 2006-02-22 | 2011-07-20 | ニチアス株式会社 | Gas detection needle |
| JP2011137652A (en) * | 2009-12-25 | 2011-07-14 | Enviro Tech International Inc | Method for inspecting breakage of underground buried object |
| JP2011043524A (en) * | 2010-12-03 | 2011-03-03 | Nichias Corp | Gas detection needle and gas detection method |
| JP2013075277A (en) * | 2011-09-30 | 2013-04-25 | Tokyo Gas Co Ltd | Leakage inspection gas mixer of buried pipeline, and leakage inspection method of buried pipeline |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3977233A (en) | Process and apparatus for the determination of concentration profiles of liquid or gaseous substances | |
| US7218267B1 (en) | System of subterranean anomaly detection and repair using infrared thermography and ground penetrating radar | |
| CN109030054B (en) | Simulation test device and method for directional drilling process of local coal seam | |
| CN105239574B (en) | Construction method of static pressure prestressed pipe pile applied to sea-filling geology | |
| US3085423A (en) | Leak detection | |
| CN101570974A (en) | Method for detecting quality of existing building foundation piles with parallel seismic method | |
| JPS63134930A (en) | Method for detecting damaged part of underground buried pipe | |
| CN105971031A (en) | Magnetic-induction-based pile length detection device for tubular pile construction and detection method | |
| US4413503A (en) | Method of detecting leaks in a large storage tank | |
| CN110159866B (en) | Construction method for reinforcing and reinforcing buried steel pipe | |
| CA1203401A (en) | Method and apparatus for investigating the structure and porosity of earth and stony regions | |
| JP4457243B2 (en) | Embedded piping defect detection system | |
| CN218762746U (en) | Buried natural gas pipeline leakage detection device | |
| CN217787053U (en) | Transparent soil simulation device for soil deformation caused by vertical pipe jacking method | |
| JPS61273382A (en) | Method of maintaining and inspecting buried tank | |
| JPH1019715A (en) | Method for detecting water leakage, gas leakage of shielding structure | |
| TWI855964B (en) | Methods for testing the effectiveness of geological improvement | |
| JPH07167733A (en) | Method for inspecting cracked state of underground buried pipe | |
| JP3744396B2 (en) | Construction method of steel sheet pile impervious wall and its joint structure | |
| CN209166718U (en) | A kind of pipe leakage detection experimental rig | |
| CN221076199U (en) | Gas pipeline warning device | |
| Kronberg | KBS-3H Preparations, assembly and installation of the Multi Purpose Test | |
| JP3119986B2 (en) | Investigation method of leaking point of underground water pipe | |
| JP3573579B2 (en) | Identifying the location of leaks in buried pipes | |
| JPS60188829A (en) | Gas leakage inspecting device |