JP3466483B2 - Manhole insulation lid - Google Patents
Manhole insulation lidInfo
- Publication number
- JP3466483B2 JP3466483B2 JP23921298A JP23921298A JP3466483B2 JP 3466483 B2 JP3466483 B2 JP 3466483B2 JP 23921298 A JP23921298 A JP 23921298A JP 23921298 A JP23921298 A JP 23921298A JP 3466483 B2 JP3466483 B2 JP 3466483B2
- Authority
- JP
- Japan
- Prior art keywords
- heat insulating
- manhole
- insulating plate
- heat
- drain hole
- 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
- 238000009413 insulation Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 26
- 229910052742 iron Inorganic materials 0.000 description 13
- 230000000694 effects Effects 0.000 description 6
- 239000006260 foam Substances 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000005413 snowmelt Substances 0.000 description 1
Landscapes
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】この発明は、マンホールの断
熱用内蓋、特に、マンホールの内周面との密着力が常
時、良好に維持される結果、優れた断熱効果が得られ、
しかも、マンホール内に取り付ける際のエッジの欠損の
恐れがなく、更に、水抜きが自然に行われると共に水抜
き孔からの温熱の漏れを確実に防止することができる、
マンホールの断熱用内蓋に関するものである。
【０００２】
【従来の技術】多雪地域においては、除雪を行うにもか
かわらず車道に雪が積もることがある。車道に均一な深
さに雪が積もる場合には、大問題にはならないが、マン
ホールの鉄蓋上に積もった雪は、マンホール内の温熱に
より加温されるので、溶かされ、その部分の路面に段差
が生じ、重大な交通障害を招く社会問題となっていた。
マンホール内の温熱は、例えば、マンホール内を流れる
下水の保有する熱に起因する。
【０００３】上述した問題は、マンホール内の温熱がマ
ンホールの鉄蓋に伝達されないようにすることによって
解決できる。そこで、実開昭６４−１４２４６号公報に
は、マンホール内の温熱がマンホールの鉄蓋に伝達され
ないようにするための、マンホールの断熱用内蓋が開示
されている。以下、このマンホールの断熱用内蓋を従来
内蓋といい、図面を参照しながら説明する。
【０００４】図５は、従来内蓋を示す断面図、図６は、
従来内蓋をマンホール内に取り付けた状態を示す断面図
である。図５および図６に示すように、従来内蓋は、合
成樹脂発泡体からなる円形状断熱板１からなっている。
断熱板１には、これをマンホール２の鉄蓋３に連結する
ため、あるいは、断熱板１の取手となる針金４の挿通孔
１Ａが形成されている。断熱板１の下端径寸法Ｒ１は、
上端径寸法Ｒ２より小さく形成され、即ち、下細りに形
成され、上端径寸法Ｒ２は、マンホール２の内径寸法よ
り若干大きく形成されている。これは、断熱板１をマン
ホール２内に嵌め込んだときに、マンホール２の内周面
への押付け力を生じさせて、断熱板１とマンホール２と
の密着性を良好にするためである。
【０００５】このように構成されている従来内蓋によれ
ば、図６に示すように、鉄蓋３と間隔をあけてその下部
のマンホール２内に断熱板１を押し込む。これによっ
て、マンホール２内の温熱が鉄蓋３に伝達されることを
防止して、鉄蓋３上に積もった雪の融解を防止すること
ができる。
【０００６】
【発明が解決しようとする課題】しかしながら、上述し
た従来内蓋は、以下のような問題点を有していた。
断熱板１は、マンホール２内にむりやり押し込ま
れ、しかも、この押込み際に大径寸法Ｒ２の断熱板１の
エッジに押込み力が集中するので、断熱板１が変形しや
すい。断熱板１が変形すると、断熱板１の外周面とマン
ホール２の内周面との間に隙間が生じて、気密性が低下
する結果、所望の断熱効果が得られない。
経年変化によって、断熱板１のエッジとマンホール
２の内周面との密着力が低下し、この点からも所望の断
熱効果が得られない。
断熱板１は、合成樹脂発泡体からなっているので、
断熱板１をマンホール２内に押込む際に、断熱板１の肉
厚の薄いエッジが欠損しやすい。
断熱板１に水抜き孔が形成されていないので、鉄蓋
３からマンホール２内に流入する融雪水が断熱板１上に
溜まり、排出されない。なお、断熱板１には、鉄蓋３に
連結するため、あるいは、断熱板１の取手となる針金４
の挿通孔１Ａが形成されているが、針金４の挿通孔１Ａ
程度の小径孔では、水抜き孔の用をなさない。
【０００７】従って、この発明の目的は、マンホールの
内周面との密着力が常時、良好に維持される結果、優れ
た断熱効果が得られ、しかも、マンホールに取り付ける
際のエッジの欠損の恐れがなく、更に、水抜きが自然に
行われると共に水抜き孔からの温熱の漏れを確実に防止
することができる、マンホールの断熱用内蓋を提供する
ことにある。
【０００８】
【課題を解決するための手段】請求項１記載の発明は、
水抜き孔が形成された円形状の断熱板と、前記断熱板の
外周面に取り付けられた柔軟性を有する材質からなるチ
ューブとからなり、前記断熱板は、膨張させた前記チュ
ーブを介してマンホール内に密着、保持される、マンホ
ールの断熱用内蓋において、前記水抜き孔には、フロー
ト式シールが取り付けられ、前記シールは、前記断熱板
上に溜まった水の浮力によって上昇するフロートと、前
記断熱板上に水が溜まっていないときに前記フロートを
前記水抜き孔に押し付けて前記水抜き孔を塞ぐための重
りとからなることに特徴を有するものである。
【０００９】
【００１０】
【発明の実施の形態】この発明の、マンホールの断熱用
内蓋の一実施態様を、図面を参照しながら説明する。
【００１１】図１は、この発明の断熱用内蓋の組立て斜
視図、図２は、この発明の断熱用内蓋のマンホールへの
取付け態様を示す断面図、図３は、この発明の断熱用内
蓋に使用するフロート式ストッパーを示す斜視図、図４
は、この発明の断熱用内蓋に使用するフロート式ストッ
パーの取付け状態を示す断面図である。
【００１２】図１から図４において、５は、水抜き孔５
Ａが形成された円形状の断熱板である。断熱板５は、断
熱性に富む、例えば、ポリエチレンのような合成樹脂の
発泡体からなっている。断熱板５の外周面全周には、後
述するチューブが嵌め込まれる半円形状の溝５Ｂが形成
されている。断熱板５の縁部には、前記チューブの空気
注入口が収容される凹嵌部５Ｃが形成されている。６
は、溝５Ｂ内に前記チューブを嵌め込んだ後、凹嵌部５
Ｃを塞ぐためのキャップである。キャップ６は、断熱板
５と同一材質からなっている。
【００１３】７は、断熱板５の外周面に形成された溝５
Ｂ内に嵌め込まれるゴム等の柔軟性に富む材質からなる
リング状のチューブである。チューブ７内には、空気注
入口７Ａから空気が注排気できるようになっている。な
お、チューブ７内に注入する流体としては、空気等の気
体以外に、不凍液等の液体であっても良い。このような
気体または液体をチューブ７内に注入することによっ
て、チューブ７がマンホール２の内周面に凍結して、断
熱板５がマンホール２から取り外せなくなることを防止
できる。
【００１４】上述したように構成されている、この発明
の断熱用内蓋によれば、チューブ７を嵌め込んだ断熱板
５を、マンホール２内に鉄蓋３と間隔をあけて挿入し、
水平に保持する。そして、空気注入口７Ａからチューブ
７に空気を注入して、チューブ７を膨らませる。これに
よって、断熱板５は、マンホール２内に水平に保持され
る。断熱板５とマンホール２の内周面とは、空気により
膨張した柔軟性を有するチューブ７を介して密着する結
果、気密性が向上する。従って、マンホール２内の温熱
は、断熱板５によって効果的に断熱されるので、鉄蓋３
上に積もった雪の融解を確実に防止することができる。
【００１５】断熱板５に形成された水抜き孔５Ａに、図
３に示すようなフロート式シール９を取り付ければ、断
熱板５上に溜まった水を自然にマンホール２内に排水す
ることができる。シール９は、断熱板５上に溜まった水
の浮力によって上昇するフロート１０と、断熱板９上に
水が溜まっていないときにフロート１０を水抜き孔５Ａ
の上端に押し付けて水抜き孔５Ａを塞いで、マンホール
２内の温熱が水抜き孔５Ａから漏れのを防止するための
重り１１とからなっている。断熱板５上に水が溜まる
と、フロート１０が浮力によって上昇する。これによっ
て、水抜き孔５Ａが開放されて、水がマンホール２内に
排水される。一方、断熱板５上に水がなくなると、フロ
ート１０は、重り１１の荷重により水抜き孔５Ａの上端
に押し付けられて、水抜き孔５Ａを閉鎖する。このよう
にして、水抜きが自然に行われると共に、マンホール2
内の温熱の漏れが確実に防止できる。
【００１６】
【発明の効果】以上説明したように、この発明によれ
ば、断熱板は、流体により膨張可能な柔軟性を有するチ
ューブを介してマンホール内に保持されるので、断熱板
の外周面とマンホールの内周面との間に隙間が生じず、
気密性が向上する結果、優れた断熱効果が得られ、しか
も、取付け時に断熱板のエッジが欠損することがない。
更に、水抜き孔に取り付けられたフロート式シールによ
って、水抜きが自然に行われると共に、マンホール内の
温熱の漏れが確実に防止できるといった有用な効果がも
たらされる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating inner cover for a manhole, and more particularly, to an excellent result as a result of constantly maintaining good adhesion to an inner peripheral surface of the manhole. Heat insulation effect is obtained,
In addition, there is no risk of the edge being broken when being installed in the manhole, and furthermore, the drainage is performed naturally and the leakage of heat from the drainage hole can be reliably prevented.
The present invention relates to an inner lid for heat insulation of a manhole. 2. Description of the Related Art In a snowy area, snow may accumulate on a road even though snow is removed. It does not matter if snow is piled up on the road at a uniform depth, but the snow piled up on the iron cover of the manhole is heated by the heat inside the manhole, so it is melted and There was a step, which was a social problem that caused serious traffic obstacles.
The heat inside the manhole is caused, for example, by the heat retained by the sewage flowing in the manhole. [0003] The above problem can be solved by preventing the heat in the manhole from being transmitted to the iron cover of the manhole. Therefore, Japanese Utility Model Laid-Open Publication No. 64-14246 discloses a heat insulating inner cover for a manhole for preventing the heat in the manhole from being transmitted to the iron cover of the manhole. Hereinafter, the heat insulating inner lid of the manhole is referred to as a conventional inner lid, and will be described with reference to the drawings. FIG. 5 is a sectional view showing a conventional inner lid, and FIG.
It is sectional drawing which shows the state which attached the conventional inner cover in the manhole. As shown in FIGS. 5 and 6, the conventional inner lid is formed of a circular heat insulating plate 1 made of a synthetic resin foam.
The heat insulating plate 1 is formed with an insertion hole 1A for a wire 4 for connecting the heat insulating plate 1 to the iron cover 3 of the manhole 2 or as a handle for the heat insulating plate 1. The lower end diameter dimension R1 of the heat insulating plate 1 is
The upper end diameter R2 is formed to be smaller than the upper end diameter R2, that is, it is formed to be narrower downward, and the upper end diameter R2 is formed to be slightly larger than the inner diameter of the manhole 2. This is because when the heat insulating plate 1 is fitted into the manhole 2, a pressing force is applied to the inner peripheral surface of the manhole 2 to improve the adhesion between the heat insulating plate 1 and the manhole 2. [0005] According to the conventional inner lid configured as described above, as shown in FIG. 6, the heat insulating plate 1 is pushed into the manhole 2 below the iron lid 3 at an interval from the iron lid 3. Thereby, the heat in the manhole 2 can be prevented from being transmitted to the iron cover 3, and the melting of snow accumulated on the iron cover 3 can be prevented. However, the above-described conventional inner lid has the following problems. The heat insulating plate 1 is forcibly pushed into the manhole 2, and at the time of this pushing, the pushing force concentrates on the edge of the large diameter dimension R2 of the heat insulating plate 1, so that the heat insulating plate 1 is easily deformed. When the heat insulating plate 1 is deformed, a gap is formed between the outer peripheral surface of the heat insulating plate 1 and the inner peripheral surface of the manhole 2 and the airtightness is reduced, so that a desired heat insulating effect cannot be obtained. Due to aging, the adhesion between the edge of the heat insulating plate 1 and the inner peripheral surface of the manhole 2 is reduced, and a desired heat insulating effect cannot be obtained from this point as well. Since the heat insulating plate 1 is made of a synthetic resin foam,
When the heat insulating plate 1 is pushed into the manhole 2, the thin edge of the heat insulating plate 1 is easily broken. Since no water drain hole is formed in the heat insulating plate 1, snowmelt water flowing into the manhole 2 from the iron cover 3 is collected on the heat insulating plate 1 and is not discharged. The heat insulating plate 1 has a wire 4 to be connected to the iron cover 3 or a wire 4 serving as a handle of the heat insulating plate 1.
The insertion hole 1A of the wire 4 is formed.
In a hole having a small diameter, a drain hole is not used. [0007] Accordingly, an object of the present invention is to maintain good adhesion to the inner peripheral surface of the manhole at all times, resulting in an excellent heat insulating effect, and furthermore, the risk of edge breakage when attaching to the manhole. Another object of the present invention is to provide a heat insulating inner lid for a manhole, in which drainage is performed naturally and heat leakage from a drainage hole can be reliably prevented. Means for Solving the Problems The invention according to claim 1 is:
It is composed of a circular heat insulating plate having a drain hole formed therein, and a tube made of a flexible material attached to the outer peripheral surface of the heat insulating plate, and the heat insulating plate is provided with a manhole through the expanded tube. In the heat-insulating inner lid of the manhole, which is adhered and held in the water drain hole,
The seal is attached to the heat insulating plate.
The float that rises due to the buoyancy of the water accumulated on the top and the front
When there is no water on the insulation board,
A weight for pressing the drain hole by pressing the drain hole.
It is characterized by being composed of DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a heat insulating inner cover of a manhole according to the present invention will be described with reference to the drawings. FIG. 1 is an assembled perspective view of the heat-insulating inner lid of the present invention, FIG. 2 is a cross-sectional view showing how the heat-insulating inner lid of the present invention is attached to a manhole, and FIG. Perspective view showing a float type stopper used for the inner lid, FIG.
FIG. 4 is a sectional view showing a mounted state of a float type stopper used for the heat insulating inner lid of the present invention. 1 to 4, reference numeral 5 denotes a drain hole 5;
A is a circular heat insulating plate on which A is formed. The heat insulating plate 5 is made of a synthetic resin foam having a high heat insulating property, such as polyethylene. A semicircular groove 5B into which a tube described later is fitted is formed on the entire outer peripheral surface of the heat insulating plate 5. At the edge of the heat insulating plate 5, a concave fitting portion 5C for accommodating the air inlet of the tube is formed. 6
After the tube is fitted into the groove 5B, the concave fitting portion 5
This is a cap for closing C. The cap 6 is made of the same material as the heat insulating plate 5. Reference numeral 7 denotes a groove 5 formed on the outer peripheral surface of the heat insulating plate 5.
This is a ring-shaped tube made of a highly flexible material such as rubber to be fitted into B. In the tube 7, air can be injected and exhausted from the air inlet 7A. The fluid to be injected into the tube 7 may be a liquid such as an antifreeze in addition to a gas such as air. By injecting such a gas or liquid into the tube 7, it is possible to prevent the tube 7 from freezing on the inner peripheral surface of the manhole 2 and preventing the heat insulating plate 5 from being removed from the manhole 2. According to the heat-insulating inner lid of the present invention configured as described above, the heat-insulating plate 5 in which the tube 7 is fitted is inserted into the manhole 2 at an interval from the iron lid 3.
Hold horizontally. Then, air is injected into the tube 7 from the air injection port 7A to inflate the tube 7. Thereby, the heat insulating plate 5 is held horizontally in the manhole 2. The heat insulating plate 5 and the inner peripheral surface of the manhole 2 are brought into close contact with each other via the flexible tube 7 expanded by air, so that the airtightness is improved. Therefore, the heat inside the manhole 2 is effectively insulated by the heat insulating plate 5, so that the iron cover 3
Melting of the snow piled on the top can be reliably prevented. If a float type seal 9 as shown in FIG. 3 is attached to the drain hole 5A formed in the heat insulating plate 5, water accumulated on the heat insulating plate 5 can be naturally drained into the manhole 2. . The seal 9 includes a float 10 that rises due to the buoyancy of the water collected on the heat insulating plate 5 and a water drain hole 5A when no water is collected on the heat insulating plate 9.
And a weight 11 for closing the drain hole 5A by pressing the upper end of the drain hole 5A to prevent the heat in the manhole 2 from leaking from the drain hole 5A. When water accumulates on the heat insulating plate 5, the float 10 rises by buoyancy. As a result, the drain hole 5A is opened, and the water is drained into the manhole 2. On the other hand, when there is no more water on the heat insulating plate 5, the float 10 is pressed against the upper end of the drainage hole 5A by the load of the weight 11, and closes the drainage hole 5A. In this way, drainage is performed naturally and manhole 2
Leakage of internal heat can be reliably prevented. As described above, according to the present invention, since the heat insulating plate is held in the manhole via the flexible tube which can be expanded by the fluid, the outer peripheral surface of the heat insulating plate is provided. There is no gap between the inner circumference of the manhole and
As a result of the improved airtightness, an excellent heat insulating effect can be obtained, and the edge of the heat insulating plate does not break at the time of attachment.
Further, the float-type seal attached to the drain hole has a useful effect that the drain is naturally performed and the leakage of heat in the manhole can be reliably prevented.
【図面の簡単な説明】
【図１】この発明の断熱用内蓋の組立て斜視図である。
【図２】この発明の断熱用内蓋のマンホールへの取付け
態様を示す断面図である。
【図３】この発明の断熱用内蓋に使用するフロート式ス
トッパーを示す斜視図である。
【図４】この発明の断熱用内蓋に使用するフロート式ス
トッパーの取付け状態を示す断面図である。
【図５】従来内蓋を示す断面図である。
【図６】従来内蓋をマンホール内に取り付けた状態を示
す断面図である。
【符号の説明】
１：断熱板
１Ａ：挿通孔
２：マンホール
３：鉄蓋
４：針金
５：断熱板
５Ａ：水抜き孔
５Ｂ：溝
５Ｃ：凹嵌部
６：キャップ
７：チューブ
７Ａ：空気注入口
８：受枠
９：シール
１０：フロート
１１：重りBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an assembled perspective view of a heat insulating inner lid of the present invention. FIG. 2 is a cross-sectional view showing a manner of attaching the heat-insulating inner lid of the present invention to a manhole. FIG. 3 is a perspective view showing a float type stopper used for the heat insulating inner lid of the present invention. FIG. 4 is a cross-sectional view showing an attached state of a float type stopper used for the heat insulating inner lid of the present invention. FIG. 5 is a cross-sectional view showing a conventional inner lid. FIG. 6 is a cross-sectional view showing a state where a conventional inner lid is mounted in a manhole. [Description of Signs] 1: Heat insulation plate 1A: Insertion hole 2: Manhole 3: Iron cover 4: Wire 5: Heat insulation plate 5A: Drain hole 5B: Groove 5C: Recessed fitting part 6: Cap 7: Tube 7A: Air injection Entrance 8: Receiving frame 9: Seal 10: Float 11: Weight
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 実開 平２−132747（ＪＰ，Ｕ) 実開 昭51−46469（ＪＰ，Ｕ) 登録実用新案3043060（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) E02D 29/14 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 2-132747 (JP, U) JP-A 51-46469 (JP, U) Registered utility model 3043060 (JP, U) (58) Fields surveyed ( Int.Cl. 7 , DB name) E02D 29/14
Claims (1)
と、前記断熱板の外周面に取り付けられた柔軟性を有す
る材質からなるチューブとからなり、前記断熱板は、膨
張させた前記チューブを介してマンホール内に密着、保
持される、マンホールの断熱用内蓋において、前記水抜き孔には、フロート式シールが取り付けられ、
前記シールは、前記断熱板上に溜まった水の浮力によっ
て上昇するフロートと、前記断熱板上に水が溜まってい
ないときに前記フロートを前記水抜き孔に押し付けて前
記水抜き孔を塞ぐための重りとからなる ことを特徴とす
る、マンホールの断熱用内蓋。(57) [Claim 1] A circular heat insulating plate having a drain hole formed therein, and a tube made of a flexible material attached to an outer peripheral surface of the heat insulating plate, The heat insulating plate is in close contact with and held in the manhole via the inflated tube.In the heat insulating inner lid of the manhole, the water drain hole is provided with a float type seal,
The seal is activated by the buoyancy of the water collected on the heat insulating plate.
And the water is collected on the insulation plate
Press the float against the drain hole when it is not
A heat insulation inner cover for a manhole, comprising a weight for closing the drainage hole .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23921298A JP3466483B2 (en) | 1998-08-25 | 1998-08-25 | Manhole insulation lid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23921298A JP3466483B2 (en) | 1998-08-25 | 1998-08-25 | Manhole insulation lid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000064324A JP2000064324A (en) | 2000-02-29 |
| JP3466483B2 true JP3466483B2 (en) | 2003-11-10 |
Family
ID=17041421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23921298A Expired - Fee Related JP3466483B2 (en) | 1998-08-25 | 1998-08-25 | Manhole insulation lid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3466483B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12486656B1 (en) * | 2024-06-04 | 2025-12-02 | Danny Warren Consulting, LLC | Manhole cover seal |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100566663B1 (en) | 2005-11-02 | 2006-04-03 | 주식회사 대한콘설탄트 | Electric manhole to prevent electric shock accident |
| CN106592640A (en) * | 2016-11-21 | 2017-04-26 | 国网河南洛宁县供电公司 | Power trench cover |
| NO342766B1 (en) * | 2017-04-19 | 2018-08-06 | Wdf Isolasjon As | Attachment device for installing a cover structure |
| JP6375078B1 (en) * | 2018-03-20 | 2018-08-15 | 日揮株式会社 | Opening / closing mechanism, opening / closing method, and opening / closing structure |
| KR102126193B1 (en) * | 2020-04-22 | 2020-06-24 | 주식회사 한국나이스기술단 | Information and communication cable manhole for preventing short circuit |
| CN114045877A (en) * | 2021-10-25 | 2022-02-15 | 谭富琪 | Anti-falling inspection well cover |
| CN114000546A (en) * | 2021-11-04 | 2022-02-01 | 江苏城乡建设职业学院 | Safe municipal drainage well lid with warning function floats |
-
1998
- 1998-08-25 JP JP23921298A patent/JP3466483B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12486656B1 (en) * | 2024-06-04 | 2025-12-02 | Danny Warren Consulting, LLC | Manhole cover seal |
| US20250369221A1 (en) * | 2024-06-04 | 2025-12-04 | Danny Warren Consulting, LLC | Manhole cover seal |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000064324A (en) | 2000-02-29 |
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