JPH0563393B2 - - Google Patents
Info
- Publication number
- JPH0563393B2 JPH0563393B2 JP61247489A JP24748986A JPH0563393B2 JP H0563393 B2 JPH0563393 B2 JP H0563393B2 JP 61247489 A JP61247489 A JP 61247489A JP 24748986 A JP24748986 A JP 24748986A JP H0563393 B2 JPH0563393 B2 JP H0563393B2
- Authority
- JP
- Japan
- Prior art keywords
- underground tank
- water
- filling cylinder
- water filling
- tank
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 238000007689 inspection Methods 0.000 claims description 28
- 238000005553 drilling Methods 0.000 claims description 15
- 238000012856 packing Methods 0.000 claims description 11
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 6
- 239000010425 asbestos Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、給油所等における地下タンクの保守
点検方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for maintaining and inspecting underground tanks in gas stations and the like.
給油所等における地下埋設タンク、及びこれに
付属された配管等は、地下に埋設された後では、
その状態を上から点検するのは容易ではない。
After underground tanks at gas stations, etc., and their attached piping, etc. are buried underground,
It is not easy to inspect the situation from above.
そのため、それらの漏油を調べるには、次に示
すような手順で、加圧試験あるいは減圧試験を行
うことが考えられている。 Therefore, in order to check for oil leakage, it is considered that a pressurization test or a depressurization test should be performed using the following procedure.
(1) 液相部分の漏洩の有無の確認。(1) Check for leakage of the liquid phase part.
第８図に示すように、地面Ａの下方に埋設さ
れたタンクＢの中にフロートＣを浮かせ、これ
により、計量口Ｄに設けたリークレコーダ等
で、10時間以上に亘つて、液面の変動を計測
し、その変動が生じないことを確認する。 As shown in Figure 8, a float C is floated in a tank B buried below the ground A, and a leak recorder installed at the measuring port D records the liquid level for more than 10 hours. Measure fluctuations and confirm that they do not occur.
(2) 減圧試験。(2) Decompression test.
第８図におけるタンクＢの開口部、例えば吸
油管Ｅや給油管Ｆをバルブ等で閉鎖し、通気管
Ｇあるいは計量口を、盲板等により閉鎖する。 The openings of the tank B in FIG. 8, such as the oil suction pipe E and the oil supply pipe F, are closed with valves or the like, and the ventilation pipe G or the metering port is closed with a blind plate or the like.
次いで、タンクＢの危険物の量を計測して、
空間容積を算定し、所定の減圧値を得るために
必要な量を抜きとる。 Next, measure the amount of hazardous materials in tank B,
Calculate the space volume and remove the amount necessary to obtain a predetermined reduced pressure value.
マノメータ及び圧力自記記録計（共に図示
略）を取付けて、一定時間の圧力変動を計測す
る。 A manometer and a pressure recorder (both not shown) are attached to measure pressure fluctuations over a certain period of time.
(3) 地下配管等の漏洩の有無の調査。(3) Investigating whether there is any leakage from underground piping, etc.
上述したのと同様に、配管の開口部を、バル
ブ又は盲板等で閉鎖し、加圧装置及び圧力計、
圧力自記記録計を取付ける。 In the same way as described above, the opening of the piping is closed with a valve or blind plate, etc., and a pressurizing device and a pressure gauge are installed.
Install a pressure recorder.
次いで、水又は窒素ガスを封入し、加圧装置
によつて、配管内の圧力を常用圧力まで高め、
圧力変動を計測する。 Next, water or nitrogen gas is filled in, and the pressure inside the pipe is increased to normal pressure using a pressurizing device.
Measure pressure fluctuations.
〔発明が解決しようとする問題点〕
上述した試験方法は、いずれも、実験的には試
みられてきたが、給油所にすでに埋設されている
地下タンクの漏洩試験としては、問題があり、十
分に利用されてはいない。[Problems to be Solved by the Invention] All of the above-mentioned test methods have been tried experimentally, but they have problems and are insufficient for leakage tests of underground tanks already buried in gas stations. It is not used for.
すなわち、作業性が悪く、また検査用治具を、
地下タンクの金具等に合わせて製作しなければな
らないため、実施が困難である。 In other words, the workability is poor, and the inspection jig is
It is difficult to implement because it must be manufactured to match the metal fittings of the underground tank.
そのため、地下タンクそのものの内部点検、、
保守等の管理のためのよりよい方法が求められて
いる。 Therefore, internal inspection of the underground tank itself,
There is a need for better methods for managing maintenance, etc.
本発明は、地下タンクの内部点検及び補修がで
きるように、地面を掘り下げて、既存のタンクに
点検孔を設けることにより、地下タンク内に人が
入り、その内部で保守点検が行なえるとともに、
安全かつ迅速に作業を行なえるようにした、新規
な地下タンクの保守点検方法を提供しようとする
ものである。
The present invention allows a person to enter the underground tank and perform maintenance and inspection inside the tank by digging into the ground and providing an inspection hole in the existing tank so that the internal inspection and repair of the underground tank can be carried out.
This paper aims to provide a new underground tank maintenance and inspection method that allows work to be carried out safely and quickly.
本発明による地下タンクの保守点検方法は、地
下タンク内の油を抜き、代わりに水を注入してガ
ス抜きをした後、地面に、前記地下タンクに通じ
る孔を掘り、次いで、下端開口縁にパツキングを
有する水張り用筒体を地下タンクの上面に仮置き
し、前記孔上に設けた架台に穿孔機を取付けると
ともに、地下タンクの上面に仮置きされた水張り
用筒体を架台側より押圧することにより、水張り
用筒体の下端を地下タンクの上面に前記パツキン
グを介して液密状態で密着させ、次いで、水張り
用筒体内に注水することにより、地下タンクの上
面要所に水を張り、この水で充たされた水張り用
筒体内で穿孔機の刃体を回転させつつ下降させる
ことにより、地下タンクの上面における前記水張
り用筒体の下端開口縁で囲まれた部分に点検孔を
穿設し、しかる後、地下タンクの水抜きを行なつ
て、地下タンク及び付属配管の点検のために、検
査員が前記点検孔より入りうるようにしたことを
特徴としている。 The underground tank maintenance/inspection method according to the present invention involves draining the oil in the underground tank and injecting water instead to remove the gas, then digging a hole in the ground that leads to the underground tank, and then opening the bottom edge of the underground tank. Temporarily place a water filling cylinder with packing on the top of the underground tank, attach a drilling machine to the pedestal provided over the hole, and press the water filling cylinder temporarily placed on the top of the underground tank from the pedestal side. By this, the lower end of the water-filling cylinder is brought into close contact with the upper surface of the underground tank via the packing in a liquid-tight state, and then water is poured into the water-filling cylinder to fill key points on the upper surface of the underground tank, By rotating and lowering the blade of the drilling machine inside the water-filling cylinder filled with water, an inspection hole is bored in the upper surface of the underground tank in the area surrounded by the lower opening edge of the water-filling cylinder. The invention is characterized in that an inspector can enter through the inspection hole in order to inspect the underground tank and attached piping by draining water from the underground tank and inspecting the underground tank and attached piping.
地下タンクにおける穿孔しようとする部分の上
面に水を張つた状態で穿孔が行われる。
Drilling is performed with water filling the top surface of the part of the underground tank to be drilled.
水張り用筒体は、架台側から押圧されることに
より、下端開口縁が地下タンクの上面にパツキン
グを介して液密状態で密着させられるので、その
後に水張り用筒体の内側に水を張つたとき、水張
り用筒体の下端と地下タンクの上面との間から水
洩れすることはなく、また作業終了後には、水張
り用筒体を簡単に取り除くことができる。 When the water filling cylinder is pressed from the mount side, the lower end opening edge is brought into close contact with the top surface of the underground tank via packing in a liquid-tight state, so that water can then be filled inside the water filling cylinder. At this time, water does not leak from between the lower end of the water filling cylinder and the upper surface of the underground tank, and the water filling cylinder can be easily removed after the work is completed.
以下、本発明の実施例を、第１図乃至第７図に
基づいて詳細に説明する。
Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 7.
第１図に示す１は、給油所の敷地で、その表面
は、コンクリート舗装１ａをもつて覆われ、その
下方には、地下室１ｂが形成されている。 Reference numeral 1 shown in FIG. 1 is the site of a gas station, the surface of which is covered with a concrete pavement 1a, and below which a basement 1b is formed.
地下室１ｂの床には、ガソリン等の給油用のた
めの、中空円筒状の水平の地下タンク２が設置さ
れ、この地下タンク２には、吸引管３、給油管
４、計量口５、通気管６が、それぞれ所定の位置
に接続されている。 A hollow cylindrical horizontal underground tank 2 for refueling with gasoline or the like is installed on the floor of the basement 1b, and this underground tank 2 includes a suction pipe 3, a fuel supply pipe 4, a metering port 5, and a ventilation pipe. 6 are connected to respective predetermined positions.
この地下タンク２について、漏油等の点検を行
うには、まず最初に、地下タンク２内のガソリン
の全部を、吸引管３を通じて吸引し、地下タンク
２内を空にする。 To inspect underground tank 2 for oil leakage, etc., first, all of the gasoline in underground tank 2 is sucked through suction pipe 3 to empty underground tank 2.
次いで、給油管４を通じて、清水Ｈを地下タン
ク２内に送り込み、地下タンク２内を満たす。 Next, fresh water H is sent into the underground tank 2 through the oil supply pipe 4 to fill the inside of the underground tank 2.
地下タンク２内の残油又はガスを完全に抜くた
めに、計量口５から地下タンク２内にドライアイ
スを投入した後、可燃ガスの発散を、前記計量口
５及び通気管６において、ガス検知器（酸素濃度
計）で測定し、確認する。 In order to completely remove residual oil or gas from the underground tank 2, after putting dry ice into the underground tank 2 through the metering port 5, gas detection is performed to detect the release of flammable gas at the metering port 5 and the vent pipe 6. Measure with a device (oxygen concentration meter) and confirm.
次に、地下タンク２の上面へ穿孔をするため
に、コンクリート舗装１ａの要所に孔をあける。 Next, in order to drill holes into the upper surface of the underground tank 2, holes are drilled at important points in the concrete pavement 1a.
すなわち、地下タンク２の上面に、マンホール
７の取付け個所を決め、この取付け個所に対応す
るコンクリート舗装１ａ及び地下室１ｂの天井部
を、上方から掘り下げて、辺1.2ｍの方形孔８を
開け、その中に枠体９を嵌合して補強する。 That is, the installation location of the manhole 7 is determined on the top surface of the underground tank 2, and the concrete pavement 1a corresponding to this installation location and the ceiling of the basement 1b are dug from above to make a square hole 8 with a side of 1.2 m. A frame body 9 is fitted inside for reinforcement.
一方、第２図に示す１０は水張り用筒体であ
り、上下面が開口する方形筒状をなし、かつその
前後板１０ａ，１０ｂの下端縁は、地下タンク２
の外周面と同じ曲率半径をなすように、正面から
見て円弧状に形成されている。 On the other hand, 10 shown in FIG. 2 is a water filling cylinder, which has a rectangular cylindrical shape with open upper and lower surfaces, and the lower edges of the front and rear plates 10a, 10b are connected to the underground tank 2.
It is formed into an arc shape when viewed from the front so that it has the same radius of curvature as the outer circumferential surface of.
水張り用筒体１０の下端開口縁には、ゴム等か
らなる枠状パツキング１１が嵌合されている。 A frame-shaped packing 11 made of rubber or the like is fitted to the lower opening edge of the water filling cylinder 10.
前記方形孔８を通して、この水張り用筒体１０
を降ろし、地下タンク２の上面に仮置きする。 This water filling cylinder 10 is inserted through the square hole 8.
and temporarily place it on the top of underground tank 2.
第３図及び第４図に示す１２は穿孔機で、枠体
９の上面に固着した架台１８に取付けられてい
る。 Reference numeral 12 shown in FIGS. 3 and 4 is a punching machine, which is attached to a pedestal 18 fixed to the upper surface of the frame 9.
穿孔機１２における縦型円筒状をなす本体１２
ａの上端部には、モータ１３が取付けられ、また
本体１２ａの下端部には、回転可能、かつ上下動
可能な軸１５が、下降装置１４を介して、下向き
に突設されている。 A vertical cylindrical main body 12 of the drilling machine 12
A motor 13 is attached to the upper end of the main body 12a, and a rotatable and vertically movable shaft 15 is provided to protrude downward through a lowering device 14 at the lower end of the main body 12a.
軸１５の下端には、中央にセンタードリル１６
を備え、かつ円筒状の胴部の下端に、波形の刃１
７ａが形成された刃体１７が取付けられている。 A center drill 16 is provided in the center of the lower end of the shaft 15.
and a corrugated blade 1 at the lower end of the cylindrical body.
A blade body 17 having a shape 7a formed thereon is attached.
穿孔機１２の本体１２ａは、架台１８の中央部
における平行な支持杆１８ａ，１８ａの開に、取
付金具１８ｂをもつて取付けられている。 The main body 12a of the drilling machine 12 is attached to the opening of parallel support rods 18a, 18a in the center of the pedestal 18 using a mounting bracket 18b.
第４図に示す１９は押しボルトで、その上端部
は、前記架台１８と一体をなすブラケツト２０に
螺合されている。 Reference numeral 19 shown in FIG. 4 is a push bolt, the upper end of which is screwed into a bracket 20 that is integral with the pedestal 18.
押しボルト１９の下端面を、前述したように、
仮置きされた水張り用筒体１０の上端縁に当接さ
せた後、押しボルト１９を回転させて、その下端
で水張り用筒体１０を押圧すると、水張り用筒体
１０の下端面は、地下タンク２の上面に液密状態
で密着する。 As mentioned above, the lower end surface of the push bolt 19 is
After contacting the upper end edge of the temporarily placed water filling cylinder 10, the push bolt 19 is rotated and the lower end of the water filling cylinder 10 is pressed, so that the lower end surface of the water filling cylinder 10 is placed underground. It is in close contact with the upper surface of the tank 2 in a liquid-tight state.
次に、地下タンク２に対する点検孔２１穿設作
業について説明する。 Next, the drilling work of the inspection hole 21 in the underground tank 2 will be explained.
送水用ホース（図示略）により、水張り用筒体
１０内に注水して水を張つた後、モータ１３によ
り、センタードリル１６及び刃体１７を回転させ
る。 After filling the water filling cylinder 10 with water using a water supply hose (not shown), the center drill 16 and the blade 17 are rotated by the motor 13.
下降装置１４を操作して軸１５を降下させ、セ
ンタードリル１６で孔をあけ、続いて、刃１７ａ
で地下タンク２の上面を切削して、点検孔２１を
穿設する。 The lowering device 14 is operated to lower the shaft 15, a hole is drilled with the center drill 16, and then the blade 17a is drilled.
The upper surface of the underground tank 2 is cut to make an inspection hole 21.
点検孔２１は、実施例では、直径45cmの丸孔と
してある。 In the embodiment, the inspection hole 21 is a round hole with a diameter of 45 cm.
点検孔２１をあけ終つたら、穿孔機１２及び架
台１８を枠体９から取外し、また水張り用筒体１
０も取外して運び出す。 After drilling the inspection hole 21, remove the drilling machine 12 and stand 18 from the frame 9, and remove the water filling cylinder 1.
0 is also removed and carried out.
次に、地下タンク２内の水抜きを行い、地下タ
ンク２内の空気を置換するとともに、その内部洗
浄を行う。 Next, the water in the underground tank 2 is drained, the air in the underground tank 2 is replaced, and the inside thereof is cleaned.
最後に、検査員が点検孔２１から地下タンク２
内に入り、内部の目視検査及び地下タンク及び配
管の板厚測定、配管の漏洩有無を調べる耐圧試験
等の種々の点検を行う。 Finally, the inspector inspects the underground tank 2 through the inspection hole 21.
Once inside, various inspections will be carried out, including a visual inspection of the interior, measurement of the plate thickness of underground tanks and piping, and a pressure test to check for leaks in the piping.
点検の結果、必要であれば、地下タンクの内面
塗装あるいは地中埋設管の補修を行い、耐久性が
ないと判断した場合には、地下タンクを新しいも
のと交換する。 As a result of the inspection, if necessary, paint the inside of the underground tank or repair the underground pipes, and if it is determined that the tank is not durable, replace the underground tank with a new one.
点検および補修を終了すると、第５図に示すよ
うに、マンホール７を点検孔２１に取付ける。 After completing the inspection and repair, the manhole 7 is installed in the inspection hole 21, as shown in FIG.
マンホール７は、上下面が開口する円筒部７ａ
と、この円筒部７ａの上縁より水平に外向突設さ
れたフランジ７ｂと、円筒部７ａの下部外周面に
取付けられ、かつ地下タンク２の外面と補形をな
す取付けリング７ｃとからなつている。 The manhole 7 has a cylindrical portion 7a with open upper and lower surfaces.
It consists of a flange 7b horizontally projecting outward from the upper edge of the cylindrical portion 7a, and a mounting ring 7c attached to the lower outer peripheral surface of the cylindrical portion 7a and complementary to the outer surface of the underground tank 2. There is.
取付リング７ｃと地下タンク２の点検孔２１の
周縁との間に、石綿よりなるリング状のパツキン
２２を挟んで、それらを、ボルト２３及びナツト
２４をもつて互いに締着することにより、マンホ
ール７を、地下タンク２の点検孔２１の周縁に気
密状態で固着する。 A ring-shaped packing 22 made of asbestos is sandwiched between the mounting ring 7c and the periphery of the inspection hole 21 of the underground tank 2, and the manhole 7 is tightened with bolts 23 and nuts 24. is fixed to the periphery of the inspection hole 21 of the underground tank 2 in an airtight manner.
また、マンホール７のフランジ７ｂと蓋板２５
の間に石綿シートからなるパツキン２６を挟み、
それらをボルト２７及びナツト２８をもつて、互
いに締着することにより、マンホール７の開口
を、蓋板２５により気密状態で閉塞する。 In addition, the flange 7b of the manhole 7 and the cover plate 25
A packing 26 made of asbestos sheet is sandwiched between the two.
By tightening them together with bolts 27 and nuts 28, the opening of the manhole 7 is closed in an airtight manner by the cover plate 25.
最後に、コンクリート舗装１ａの方形孔８の周
囲に復旧工事を施し、かつ再度の保守点検を可能
とするべく、マンホール蓋３３を取付ける。 Finally, restoration work is carried out around the rectangular hole 8 in the concrete pavement 1a, and a manhole cover 33 is attached to enable maintenance and inspection again.
すなわち、地下室１ｂの天井部における開口縁
に、鍔付円筒３０を嵌合固着し、この鍔付円筒３
０の中に、地下タンク２の上部にマンホール７を
囲むようにして立設した円筒３１の上部を、上下
方向に相対的に摺動しうるように嵌合し、地下タ
ンク２のみが沈下した場合にも、支障が起きない
ようにする。 That is, the flanged cylinder 30 is fitted and fixed to the opening edge in the ceiling of the basement 1b, and this flanged cylinder 3
0, the upper part of a cylinder 31 that is erected at the upper part of the underground tank 2 so as to surround the manhole 7 is fitted so that it can slide relatively in the vertical direction, and when only the underground tank 2 sinks, Also, make sure that there are no problems.
コンクリート舗装１ａにおける方形孔８に、コ
ンクリート板３２を嵌合し、このコンクリート板
３２の中心部の孔に、マンホール蓋３３を嵌合す
る。 A concrete plate 32 is fitted into the rectangular hole 8 in the concrete pavement 1a, and a manhole cover 33 is fitted into a hole in the center of the concrete plate 32.
上述の実施例において、マンホールは、地下タ
ンクにボルト及びナツトで締着したが、これに代
わり、地下タンクにマンホールを接着剤等により
固着してもよい。 In the embodiments described above, the manhole was fixed to the underground tank with bolts and nuts, but instead, the manhole may be fixed to the underground tank with an adhesive or the like.
本発明によれば、地下タンクに点検孔を穿設す
るに際し、地下タンクの穿孔部の上下に水を張る
ため、穿孔機のセンタードリル及び刃体が、タン
クの上面を切削するのに際して、生じる熱や火花
による残留ガス等の引火事故が生じる虞れがな
く、安全性が高い。
According to the present invention, when drilling an inspection hole in an underground tank, water is filled above and below the hole in the underground tank, so when the center drill and blade of the drilling machine cut the top surface of the tank, It is highly safe as there is no risk of residual gas igniting due to heat or sparks.
また、地下タンクに点検孔を設けることによつ
て、人による地下タンク内での直接の点検が可能
となり、これまで長年放置されてきた地下タンク
及びその配管の漏洩試験とが容易となつて、地下
タンクの安全管理及び給油所等の安全操作に役立
つ。 In addition, by providing inspection holes in underground tanks, it becomes possible for people to directly inspect the inside of underground tanks, making it easier to perform leakage tests on underground tanks and their piping, which have been neglected for many years. Useful for safe management of underground tanks and safe operation of gas stations, etc.
さらに、本発明によると、水張り用筒体の下端
開口縁にパツキングを設け、水張り用筒体を架台
側より押圧することにより、水張り用筒体の下端
を地下タンクの上面にパツキングを介して液密状
態で密着させるので、パテその他の手段によりシ
ールする等の煩雑な作業を行なわなくとも、その
後の水張り用筒体内に水を張つたとき、洩水する
ことはなく、また作業終了後には、水張り用筒体
を簡単に取り除くことができ、便利である。 Furthermore, according to the present invention, packing is provided on the lower end opening edge of the water filling cylinder, and by pressing the water filling cylinder from the pedestal side, the lower end of the water filling cylinder is placed on the upper surface of the underground tank via the packing. Since it is sealed tightly, there is no need to perform complicated work such as sealing with putty or other means, and there will be no leakage when water is subsequently filled in the water filling cylinder, and after the work is completed, The water filling cylinder can be easily removed, which is convenient.
しかも、本発明によると、作業全体を通じて、
溶接等の火花の発生する作業を全く行わなくてよ
いという利点がある。 Moreover, according to the present invention, throughout the work,
It has the advantage that there is no need to perform work that generates sparks, such as welding.
第１図は、本発明の実施に際して、点検孔を穿
設する作業工程を説明するために、地下タンクを
縦断した図、第２図は、水張り作業を示す一部切
欠斜視図、第３図は、同じく孔あけ作業を示す一
部切欠斜視図、第４図は、第３図の中央縦断面
図、第５図は、地下タンクにマンホールを取付け
る作業を示す分解縦断面図、第６図は、復旧工事
後のコンクリート舗装面を示す一部平面図、第７
図は、第６図の−線における縦断面図、第８
図は、従来の地下タンクの漏洩試験方法を説明す
るための埋設タンクの縦断面図である。
、１……敷地、１ａ……コンクリート舗装、１
ｂ、地下室、２……地下タンク、３……吸引管、
４……給油管、５……計量口、６……通気管、７
……マンホール、８……方形孔、９……枠体、１
０……水張り用筒体、１１……パツキン、１２…
…穿孔機、１４……下降装置、１６……センター
ドリル、１７……刃体、１７ａ……刃、１８……
架台、１９……押しボルト、２１……点検孔、２
２，２６……パツキン、２５……蓋板、３２……
コンクリート板、３３……マンホール蓋。
Fig. 1 is a vertical cross-sectional view of an underground tank to explain the work process of drilling an inspection hole when implementing the present invention, Fig. 2 is a partially cutaway perspective view showing water filling work, and Fig. 3 4 is a partially cutaway perspective view showing the same drilling work, FIG. 4 is a central vertical sectional view of FIG. 3, FIG. 5 is an exploded vertical sectional view showing the work of installing a manhole in an underground tank, and FIG. 6 Figure 7 is a partial plan showing the concrete pavement surface after restoration work.
The figure is a vertical sectional view taken along the - line in Figure 6;
The figure is a longitudinal sectional view of an underground tank for explaining a conventional underground tank leakage test method. , 1...Site, 1a...Concrete pavement, 1
b. Basement, 2... Underground tank, 3... Suction pipe,
4...Oil supply pipe, 5...Measuring port, 6...Vent pipe, 7
... Manhole, 8 ... Square hole, 9 ... Frame, 1
0...Cylinder for water filling, 11...Packing, 12...
...Drilling machine, 14...Descent device, 16...Center drill, 17...Blade body, 17a...Blade, 18...
Frame, 19... Push bolt, 21... Inspection hole, 2
2, 26...Putskin, 25...Lid plate, 32...
Concrete board, 33...manhole cover.
Claims (1)
してガス抜きをした後、地面に、前記地下タンク
に通じる孔を掘り、次いで、下端開口縁にパツキ
ングを有する水張り用筒体を地下タンクの上面に
仮置きし、前記孔上に設けた架台に穿孔機を取付
けるとともに、地下タンクの上面に仮置きされた
水張り用筒体を架台側より押圧することにより、
水張り用筒体の下端を地下タンクの上面に前記パ
ツキングを介して液密状態で密着させ、次いで、
水張り用筒体内に注水することにより、地下タン
クの上面要所に水を張り、この水で充たされた水
張り用筒体内で穿孔機の刃体を回転させつつ下降
させることにより、地下タンクの上面における前
記水張り用筒体の下端開口縁で囲まれた部分に点
検孔を穿設し、しかる後、地下タンクの水抜きを
行なつて、地下タンク及び付属配管の点検のため
に、検査員が前記点検孔より入りうるようにした
ことを特徴とする地下タンクの保守点検方法。1 After draining the oil in the underground tank and injecting water instead to release the gas, dig a hole in the ground that leads to the underground tank, and then insert a water filling cylinder with packing on the lower opening edge into the underground tank. By temporarily placing it on the top surface of the underground tank, attaching a drilling machine to the pedestal provided above the hole, and pressing the water filling cylinder temporarily placed on the top surface of the underground tank from the pedestal side,
The lower end of the water filling cylinder is brought into close contact with the upper surface of the underground tank via the packing in a liquid-tight state, and then
By injecting water into the water filling cylinder, water is filled at key points on the top surface of the underground tank, and by rotating and lowering the blade of the drilling machine inside the water filling cylinder filled with water, the underground tank is filled with water. An inspection hole is drilled in the upper surface surrounded by the lower opening edge of the water filling cylinder, and after that, the underground tank is drained, and the inspector inspects the underground tank and attached piping. A method for maintenance and inspection of an underground tank, characterized in that the tank can enter through the inspection hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61247489A JPS63110195A (en) | 1986-10-20 | 1986-10-20 | Method of maintaining and inspecting underground tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61247489A JPS63110195A (en) | 1986-10-20 | 1986-10-20 | Method of maintaining and inspecting underground tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63110195A JPS63110195A (en) | 1988-05-14 |
| JPH0563393B2 true JPH0563393B2 (en) | 1993-09-10 |
Family
ID=17164225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61247489A Granted JPS63110195A (en) | 1986-10-20 | 1986-10-20 | Method of maintaining and inspecting underground tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63110195A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1035869C (en) * | 2008-08-26 | 2010-03-11 | Erik Jeroen Eenkhoorn | METHOD AND SYSTEM FOR LIMITING AND PREVENTING EMISSIONS OF STORAGE TANKS FOR LIQUID PRODUCTS. |
| JP2021116098A (en) * | 2020-01-24 | 2021-08-10 | 株式会社サンフロイント | Repair method of buried tank |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6333294A (en) * | 1986-07-22 | 1988-02-12 | 株式会社 富永製作所 | Method of machining manhole of underground tank for storing dangerous substance |
-
1986
- 1986-10-20 JP JP61247489A patent/JPS63110195A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6333294A (en) * | 1986-07-22 | 1988-02-12 | 株式会社 富永製作所 | Method of machining manhole of underground tank for storing dangerous substance |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63110195A (en) | 1988-05-14 |
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