JP4079700B2 - Manhole structure - Google Patents

Manhole structure Download PDF

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JP4079700B2
JP4079700B2 JP2002183591A JP2002183591A JP4079700B2 JP 4079700 B2 JP4079700 B2 JP 4079700B2 JP 2002183591 A JP2002183591 A JP 2002183591A JP 2002183591 A JP2002183591 A JP 2002183591A JP 4079700 B2 JP4079700 B2 JP 4079700B2
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Prior art keywords
lid
support shaft
engagement
frame
shaft
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JP2004027573A (en
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今野榮夫
今野修一
今野栄二
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今野 榮夫
今野 修一
今野栄二
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Description

【０００１】
【発明の属する技術分野】
本発明は、マンホールの構造に関するものである。
【０００２】
【従来の技術】
豪雨などにより短期間に計画量を超えた水が下水道に集まる場合がある。
するとマンホールの蓋が下から押し上げられて浮上する。
その場合に予めマンホールの一部と蓋とを連結してないと蓋が流出してマンホールが開放してしまい、危険な状態となる。
そのような問題を生じないために、マンホールの躯体と蓋とをなんらかの方法で連結して蓋の流出を阻止する方法も採用されている。
【０００３】
【本発明が解決しようとする課題】
しかし洪水時にマンホールの蓋が浮上するだけでなく、水が引いた後には再び正確に元の位置に復元して完全に蓋としてマンホールを閉塞させなければならない。
ところが押し上げられて浮上した蓋は水圧によって真上に浮上せず、多少下流側にずれた状態で浮上するから、水が引いた場合には位置がずれてしまい、正確にマンホールを閉塞することが困難な場合が生じる。
さらに別の問題として、蓋が相当の重量のある鉄材で構成してあることから、蓋を完全に９０度まで立ち上げて開閉するには多大な労力を要するとともに危険であるという問題がある。
【０００４】
【本発明の目的】
本発明は上記したような従来の問題を解決するためになされたもので、洪水時には蓋を自由に浮上させ、水が引いた後には再度正確な位置に復元させることができる、マンホールの構造を提供することを目的とする。
さらに本発明は、重量物である蓋を９０度まで立ち上げて開閉する必要のない、開閉が容易な、マンホールの構造を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記のような目的を達成するために、本発明のマンホールの構造は、マンホールの蓋枠と、蓋枠の内部に収納可能な蓋とより構成し、蓋と蓋枠とは支持軸によって取り付け、支持軸は縦軸の上端に水平軸を形成して構成し、支持軸の水平軸を、蓋の裏面に回転自在に取り付け、支持軸の縦軸を、蓋枠の係合穴に貫通して係合させ、支持軸の下端には係合穴の内径より直径の大きい抵抗体を取り付け、支持軸が、係合穴の内部で縦軸を中心に少なくとも１８０度の回転が可能であるように構成し、さらに、蓋を貫通する状態で、回転自在にキー軸を取りつけ、このキー軸の頭部は、蓋の表面に露出させ、
キー軸の下部は蓋の下面に突出させ、キー軸の下端には直交する状態で細長の棒状体である係合ピンをＴ字状に取りつけ、一方、蓋枠には、蓋を閉めた場合に上記した係合が挿入可能な係合窓を開設し、この係合窓は係合ピンの直径とほぼ同一の幅を有し、かつ係合ピンの直径よりも長い高さを有する、縦長の開口部として構成し、係合窓に挿入した係合ピンは、一定の高さだけ上昇が可能となり、その結果、蓋も同一の距離だけ昇降が可能となるように構成し、かつこの上昇許容距離を、蓋が蓋枠の縁よりも上方に上昇することができない範囲に定めた、マンホールの構造を特徴としたものである。
【０００６】
【本発明の実施の態様】
以下図面を参照しながら本発明のマンホールの構造の実施例について説明する。
【０００７】
＜イ＞全体の構成。
本発明は、マンホールの蓋枠２と、蓋枠２の内部に収納可能な蓋１とより構成する。
蓋枠２はその内側に上方に向けて開いた傾斜面２１を付けて形成する。
したがって、蓋１を閉める際には、蓋は傾斜面２１を滑る状態で蓋枠２の内部に収納される。
蓋の下面には、キー軸３と、支持軸４とを突設する。
このキー軸３と支持軸４によって、蓋１を蓋枠２に対して昇降自在に取りつける。
【０００８】
＜ロ＞キー軸３。
キー軸３の回転によって蓋１と蓋枠とを係合、開錠自在に構成する。
具体的には、蓋１を貫通する状態で、回転自在にキー軸３を取りつける。キー軸３の頭部は、蓋１の表面に露出させる。
キー軸３の下部は蓋１の下面に突出させる。
そして、キー軸３の下端には直交する係合ピン３１をＴ字状に取りつける。
係合ピン３１は細長の棒状体である。
【０００９】
＜ハ＞係合窓２２。
一方、蓋枠２には、蓋１を閉めた場合に上記した係合ピン３１が挿入する係合窓２２を開設する。
この係合窓２２は係合ピン３１の直径とほぼ同一の幅を有し、係合ピン３１の直径よりも長い高さを有する、縦長の開口部である。
そのために、係合窓２２に挿入した係合ピン３１は、一定の高さだけ上昇が可能となり、その結果、蓋１も同一の距離だけ昇降が可能となる。
【００１０】
＜ニ＞支持軸４。（図２）
蓋１の下面には、キー軸３と反対の位置に、支持軸４を取りつける。
この支持軸４は縦軸４５の上端に水平軸４１を形成した、ほぼＴ字状の棒状体である。
Ｔ字の横線に該当する部分が水平軸４１であり、この水平軸４１を蓋１裏面の軸穴に挿入することにより、蓋１は水平軸４１を中心に回転自在となり、すなわち開閉自在となる。
Ｔ字の縦線に該当する縦軸４５の中間に枝状に係合枝４２を突設する。
さらに縦軸４５の下端には係合体４３を取り付ける。
この係合体は、後述する蓋枠側の係合穴の内径よりも大きい寸法の部材である。
この係合体４３を例えば球体として形成し、その中央に貫通穴４４を開口し、この貫通穴４４に支持軸４の縦軸４５を挿入し、露出した端部に直交方向にストッパーピンを挿入して係合体４３の抜け出しを阻止する。
【００１１】
＜ホ＞支持軸係合穴。
蓋枠２には、係合窓２２と反対側に支持軸係合穴５を設ける。
この係合穴５の内径は、支持軸４の直径よりは大きく、係合体４３の直径よりは小さい。
したがって、支持軸４は支持軸係合穴５の内部で縦軸４５を中心に回転が可能である。
支持軸４の縦軸４５が通常の棒状体であれば、係合穴の内部で３６０度の回転が可能であるが、目的を達成するためには、少なくとも１８０度の回転が可能であればよい。
さらに支持軸４は係合穴５の内部で昇降自在である。
しかし一定距離以上の上方向への抜け出しは、下に位置させた係合体４３の存在によって阻止される。
さらに係合穴５の周辺には、係合溝４６を凹設する。
蓋１が鉛直方向に上昇した場合には、この係合溝４６に、支持軸４の係合枝４２が係合するために、蓋１はそれ以上は上昇することが不可能となる。
【００１２】
＜ヘ＞蓋１の上昇、下降。（図４）
洪水などで下水道の水量が設計量以上になると、蓋１が下から押し上げられ、ほぼ鉛直方向に上昇する。
その上昇量に応じて水は蓋１と蓋枠２との間隔から外部に流出することができる。
その場合の蓋１の上昇量は、キー軸３と支持軸４の長さによって拘束されている。
キー軸の上昇距離は、ピン３１が係合する係合窓２２の鉛直方向の長さによって決まる。
支持軸４の上昇距離は、係合枝４２が係合溝４６に係合するまでの支持軸４の長さによって決まる。
この上昇許容距離を、蓋１が蓋枠２の縁よりも上方に上昇することができない範囲に定めておけば、水位が下降した場合に蓋１は蓋枠２の内側の傾斜面２１に誘導されて、正確な位置に復元する。
したがって蓋１が下降した場合に蓋１が横移動してマンホールが開口したまま、いった危険が発生することはない。
【００１３】
＜ト＞蓋１の開放。（図５）
マンホールに人が入る場合などには蓋１を開放する必要がある。
その場合には、まずキー軸３を蓋１の外部から回転する。
次に、蓋１に開口した開放用の穴に特殊な形状の工具を係合してキー軸３側に引き寄せながら、蓋１を引き上げる。
するとまず蓋１がキー軸３側に引かれて移動する。この蓋１の移動によって、支持軸４の縦軸４５部分が係合穴５の内部でキー軸３側に移動する。
そのために蓋１を引き上げても係合枝４２が係合溝４６に係合することがなく、蓋１を完全に開放することができる。
【００１４】
＜チ＞蓋の水平回転。（図６〜８）
通常の蓋１は、一度直角に起こし、反対側に寝かせる作業を行う。
しかし蓋１は相当の厚み、重量のある鉄材であるから、直角に起こしてから再度寝かせる作業は危険を伴う。
これに対して本発明の蓋１は、支持軸４に取り付けてあり、支持軸４は図７に示すように、鉛直状態を維持したまま、係合穴５の内部で自由に回転することができる。
したがって、支持軸４に取り付けてある蓋１は、直角に起こすことなく、一度蓋枠２の面よりも上方に引き上げたら、ほぼ水平に寝かしたまま、水平面上を回転させて蓋枠２の内部を開放することができる。（図６、８）
【００１５】
【本発明の効果】
本発明の蓋１が浮上するマンホールの構造は以上説明したようになるから、次ぎのような効果を期待することができる。
＜イ＞蓋１の上昇距離が、キー軸３と支持軸４の長さによって拘束され、かつキー軸３側では蓋１が蓋枠２の縁よりも上まで上昇することがない。
そのために洪水時に蓋１が上昇してもその蓋１の位置が横方向にずれてしまうことがない。
したがって、復元した場合に正確にもとの位置まで戻り、マンホールの一部が開口したままになるような危険が発生しない。
＜ロ＞通常の蓋は、一度直角に起こし、反対側に寝かせる作業を行う。
しかし蓋は相当の厚み、重量のある鉄材であるから、直角に起こしてから再度倒して寝かせる作業は危険を伴う。
これに対して本発明の蓋は、直角に起こすことなく、ほぼ水平に寝かしたまま、水平面上を回転させて蓋枠の内部を開放することができるから重量物であっても安全に取り扱うことができる。
【図面の簡単な説明】
【図１】本発明の蓋が浮上するマンホールの全体の説明図。
【図２】蓋を支持する支持軸の形状の斜視図。
【図３】蓋を閉めた場合の支持軸の配置の説明図。
【図４】洪水などで蓋が浮上した場合の支持軸の配置の説明図。
【図５】蓋を開けた場合の支持軸の配置の説明図。
【図６】蓋を反対方向に水平回転させた場合の支持軸の配置の説明図。
【図７】図６の場合の支持軸の配置の斜視図。
【図８】蓋を起こさずに水平回転させた状態の説明図。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manhole structure.
[0002]
[Prior art]
Water that exceeds the planned amount may be collected in the sewer in a short period of time due to heavy rain.
Then, the manhole cover is pushed up from below and ascends.
In that case, if a part of the manhole and the lid are not connected in advance, the lid will flow out and the manhole will be opened, resulting in a dangerous state.
In order to prevent such a problem, a method of connecting the manhole housing and the lid in some way to prevent the lid from flowing out is also employed.
[0003]
[Problems to be solved by the present invention]
However, not only does the manhole cover rise during floods, but it must be restored to its original position again after the water is drawn, and the manhole must be completely closed as a cover.
However, the lid that has been lifted and floated does not float directly above due to water pressure, but floats in a state slightly shifted to the downstream side. Difficult cases arise.
As another problem, since the lid is made of an iron material having a considerable weight, there is a problem that it takes a lot of labor and is dangerous to open and close the lid completely up to 90 degrees.
[0004]
[Object of the present invention]
The present invention has been made to solve the above-described conventional problems, and has a manhole structure that allows a lid to float freely during a flood, and to be restored to an accurate position again after water is drawn. The purpose is to provide.
It is another object of the present invention to provide a manhole structure that is easy to open and close without having to open and close a heavy lid up to 90 degrees.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the manhole structure of the present invention comprises a manhole cover frame and a cover that can be stored inside the cover frame, and the cover and the cover frame are attached by a support shaft, The support shaft is formed by forming a horizontal axis at the upper end of the vertical axis, the horizontal axis of the support shaft is rotatably attached to the back surface of the lid, and the vertical axis of the support shaft passes through the engagement hole of the lid frame. A resistor having a diameter larger than the inner diameter of the engagement hole is attached to the lower end of the support shaft so that the support shaft can rotate at least 180 degrees around the vertical axis inside the engagement hole. In addition, the key shaft is rotatably attached in a state of penetrating the lid, and the head of this key shaft is exposed on the surface of the lid,
The lower part of the key shaft protrudes from the lower surface of the lid, and the lower end of the key shaft is attached in a T-shape with an engaging pin, which is a slender bar in a state of being orthogonal, while the lid is closed on the lid frame An engagement window into which the above-described engagement can be inserted, and the engagement window has a width substantially the same as the diameter of the engagement pin and has a height longer than the diameter of the engagement pin. The engaging pin inserted into the engaging window can be raised by a certain height, and as a result, the lid can also be raised and lowered by the same distance. It is characterized by a manhole structure in which the allowable distance is set in a range in which the lid cannot rise above the edge of the lid frame .
[0006]
[Embodiments of the present invention]
Embodiments of the manhole structure of the present invention will be described below with reference to the drawings.
[0007]
<I> Overall configuration.
The present invention includes a manhole cover frame 2 and a cover 1 that can be stored inside the cover frame 2.
The lid frame 2 is formed with an inclined surface 21 opened upward on the inside thereof.
Therefore, when the lid 1 is closed, the lid is housed inside the lid frame 2 while sliding on the inclined surface 21.
A key shaft 3 and a support shaft 4 are projected from the lower surface of the lid.
With the key shaft 3 and the support shaft 4, the lid 1 is attached to the lid frame 2 so as to be movable up and down.
[0008]
<B> Key shaft 3.
The lid 1 and the lid frame are engaged and unlocked by the rotation of the key shaft 3.
Specifically, the key shaft 3 is rotatably attached while penetrating the lid 1. The head of the key shaft 3 is exposed on the surface of the lid 1.
The lower part of the key shaft 3 is projected from the lower surface of the lid 1.
An orthogonal engagement pin 31 is attached to the lower end of the key shaft 3 in a T shape.
The engagement pin 31 is an elongated rod-like body.
[0009]
<C> Engagement window 22.
On the other hand, the lid frame 2 is provided with an engagement window 22 into which the above-described engagement pin 31 is inserted when the lid 1 is closed.
The engagement window 22 is a vertically long opening having a width substantially the same as the diameter of the engagement pin 31 and a height longer than the diameter of the engagement pin 31.
Therefore, the engagement pin 31 inserted into the engagement window 22 can be raised by a certain height, and as a result, the lid 1 can also be raised and lowered by the same distance.
[0010]
<D> Support shaft 4. (Figure 2)
A support shaft 4 is attached to the lower surface of the lid 1 at a position opposite to the key shaft 3.
The support shaft 4 is a substantially T-shaped rod-like body in which a horizontal shaft 41 is formed at the upper end of the vertical axis 45.
The portion corresponding to the T-shaped horizontal line is the horizontal shaft 41. By inserting the horizontal shaft 41 into the shaft hole on the back surface of the lid 1, the lid 1 can rotate about the horizontal shaft 41, that is, can be opened and closed. .
Engagement branches 42 project in a branch shape in the middle of the vertical axis 45 corresponding to the T-shaped vertical line.
Further, an engagement body 43 is attached to the lower end of the vertical axis 45.
This engagement body is a member having a size larger than the inner diameter of an engagement hole on the lid frame side described later.
The engaging body 43 is formed as a sphere, for example, and a through hole 44 is opened at the center thereof, the vertical axis 45 of the support shaft 4 is inserted into the through hole 44, and a stopper pin is inserted in the orthogonal direction at the exposed end. This prevents the engagement body 43 from coming off.
[0011]
<E> Support shaft engagement hole.
The cover frame 2 is provided with a support shaft engagement hole 5 on the side opposite to the engagement window 22.
The inner diameter of the engagement hole 5 is larger than the diameter of the support shaft 4 and smaller than the diameter of the engagement body 43.
Therefore, the support shaft 4 can rotate around the vertical axis 45 inside the support shaft engagement hole 5.
If the vertical axis 45 of the support shaft 4 is a normal rod-shaped body, it can be rotated 360 degrees inside the engagement hole. However, in order to achieve the purpose, at least 180 degrees can be rotated. Good.
Further, the support shaft 4 can be raised and lowered inside the engagement hole 5.
However, the upward displacement beyond a certain distance is prevented by the presence of the engaging body 43 positioned below.
Further, an engagement groove 46 is provided in the periphery of the engagement hole 5.
When the lid 1 is raised in the vertical direction, the engagement branch 42 of the support shaft 4 is engaged with the engagement groove 46, so that the lid 1 cannot be raised any further.
[0012]
<F> Raise and lower the lid 1. (Fig. 4)
When the amount of water in the sewer exceeds the design amount due to flooding or the like, the lid 1 is pushed up from below and rises in a substantially vertical direction.
Water can flow out to the outside through the distance between the lid 1 and the lid frame 2 in accordance with the amount of increase.
In this case, the lift amount of the lid 1 is restricted by the lengths of the key shaft 3 and the support shaft 4.
The ascending distance of the key shaft is determined by the vertical length of the engagement window 22 with which the pin 31 engages.
The ascending distance of the support shaft 4 is determined by the length of the support shaft 4 until the engagement branch 42 is engaged with the engagement groove 46.
If this allowable rise distance is set in a range in which the lid 1 cannot rise above the edge of the lid frame 2, the lid 1 is guided to the inclined surface 21 inside the lid frame 2 when the water level is lowered. Has been restored to the correct position.
Therefore, when the lid 1 is lowered, there is no danger that the lid 1 moves sideways and the manhole is left open.
[0013]
<G> Open the lid 1. (Fig. 5)
When a person enters a manhole, the lid 1 needs to be opened.
In that case, the key shaft 3 is first rotated from the outside of the lid 1.
Next, the lid 1 is pulled up while engaging a specially shaped tool in the opening hole opened in the lid 1 and pulling it toward the key shaft 3 side.
Then, first, the lid 1 is pulled and moved to the key shaft 3 side. By this movement of the lid 1, the vertical axis 45 portion of the support shaft 4 moves to the key shaft 3 side inside the engagement hole 5.
Therefore, even if the lid 1 is pulled up, the engaging branch 42 does not engage with the engaging groove 46, and the lid 1 can be completely opened.
[0014]
<H> Horizontal rotation of the lid. (Figs. 6-8)
The normal lid 1 is erected at a right angle once and laid down on the opposite side.
However, since the lid 1 is an iron material having a considerable thickness and weight, it is dangerous to raise it at a right angle and then lay it down again.
On the other hand, the lid 1 of the present invention is attached to the support shaft 4, and the support shaft 4 can freely rotate inside the engagement hole 5 while maintaining the vertical state as shown in FIG. it can.
Therefore, the lid 1 attached to the support shaft 4 does not rise at a right angle, and once lifted above the surface of the lid frame 2, the lid 1 is rotated almost horizontally and rotated on the horizontal plane to keep the inside of the lid frame 2 Can be released. (Figs. 6 and 8)
[0015]
[Effect of the present invention]
Since the structure of the manhole on which the lid 1 of the present invention floats is as described above, the following effects can be expected.
<A> The rising distance of the lid 1 is restrained by the lengths of the key shaft 3 and the support shaft 4, and the lid 1 does not rise above the edge of the lid frame 2 on the key shaft 3 side.
Therefore, even if the lid 1 is raised during a flood, the position of the lid 1 does not shift laterally.
Therefore, there is no danger of returning to the original position exactly when restored and leaving a part of the manhole open.
<B> A normal lid is raised once at a right angle and laid on the opposite side.
However, since the lid is an iron material with considerable thickness and weight, it is dangerous to raise it at a right angle and then lay it down again.
On the other hand, the lid of the present invention can be safely handled even if it is heavy, since it can be rotated on a horizontal plane and opened inside the lid frame while lying almost horizontally without being raised at a right angle. Can do.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an entire manhole on which a lid according to the present invention rises.
FIG. 2 is a perspective view of the shape of a support shaft that supports a lid.
FIG. 3 is an explanatory diagram of the arrangement of support shafts when a lid is closed.
FIG. 4 is an explanatory diagram of the arrangement of support shafts when a lid floats due to a flood or the like.
FIG. 5 is an explanatory diagram of the arrangement of support shafts when the lid is opened.
FIG. 6 is an explanatory diagram of the arrangement of support shafts when the lid is horizontally rotated in the opposite direction.
7 is a perspective view of the arrangement of support shafts in the case of FIG. 6. FIG.
FIG. 8 is an explanatory diagram of a state in which the cover is rotated horizontally without raising a lid.

Claims (3)

マンホールの蓋枠と、
蓋枠の内部に収納可能な蓋とより構成し、
蓋と蓋枠とは支持軸によって取り付け、
支持軸は縦軸の上端に水平軸を形成して構成し、
支持軸の水平軸を、蓋の裏面に回転自在に取り付け、
支持軸の縦軸を、蓋枠の係合穴に貫通して係合させ、
支持軸の下端には係合穴の内径より直径の大きい抵抗体を取り付け、
支持軸が、係合穴の内部で縦軸を中心に少なくとも１８０度の回転が可能であるように構成し、
さらに、蓋を貫通する状態で、回転自在にキー軸を取りつけ、
このキー軸の頭部は、蓋の表面に露出させ、
キー軸の下部は蓋の下面に突出させ、
キー軸の下端には直交する状態で細長の棒状体である係合ピンをＴ字状に取りつけ、
一方、蓋枠には、蓋を閉めた場合に上記した係合が挿入可能な係合窓を開設し、
この係合窓は係合ピンの直径とほぼ同一の幅を有し、
かつ係合ピンの直径よりも長い高さを有する、縦長の開口部として構成し、
係合窓に挿入した係合ピンは、一定の高さだけ上昇が可能となり、その結果、蓋も同一の距離だけ昇降が可能となるように構成し、
かつこの上昇許容距離を、蓋が蓋枠の縁よりも上方に上昇することができない範囲に定めた、
マンホールの構造。A manhole cover frame,
Consists of a lid that can be stored inside the lid frame,
The lid and lid frame are attached by a support shaft,
The support shaft is configured by forming a horizontal axis at the upper end of the vertical axis,
Attach the horizontal axis of the support shaft to the back of the lid so that it can rotate freely.
The vertical axis of the support shaft is engaged through the engagement hole of the lid frame,
Attach a resistor whose diameter is larger than the inner diameter of the engagement hole to the lower end of the support shaft,
The support shaft is configured to be capable of rotating at least 180 degrees around the vertical axis within the engagement hole;
In addition, in the state that penetrates the lid, attach the key shaft to rotate freely,
The head of this key shaft is exposed on the surface of the lid,
The lower part of the key shaft protrudes from the bottom of the lid,
At the lower end of the key shaft, an engagement pin, which is an elongated rod-like body, is attached in a T shape in a state of being orthogonal,
On the other hand, the lid frame has an engagement window into which the above-described engagement can be inserted when the lid is closed,
This engagement window has a width approximately the same as the diameter of the engagement pin,
And configured as a vertically long opening having a height longer than the diameter of the engaging pin,
The engagement pin inserted into the engagement window can be raised by a certain height, and as a result, the lid can also be raised and lowered by the same distance,
And this rising allowable distance is determined in a range where the lid cannot rise above the edge of the lid frame,
Manhole structure. 支持軸からは係合枝を突設し、
蓋の鉛直上昇時には、この係合枝が、蓋枠に凹設した係合溝に係合可能に構成した、
請求項１記載のマンホールの構造。An engaging branch projects from the support shaft,
When the lid is vertically raised, this engaging branch is configured to be engageable with an engaging groove recessed in the lid frame.
The manhole structure according to claim 1. 支持軸の縦軸の下端に取り付ける抵抗体は、縦軸とは取り付け、取り外しが可能であるように構成した、
請求項１記載のマンホールの構造The resistor attached to the lower end of the vertical axis of the support shaft is configured to be attached and detached from the vertical axis,
The manhole structure according to claim 1.
JP2002183591A 2002-06-24 2002-06-24 Manhole structure Expired - Fee Related JP4079700B2 (en)

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KR101256208B1 (en) * 2011-01-17 2013-04-19 신진정공 주식회사 Sluice valve iron cover
CN105317057A (en) * 2014-08-01 2016-02-10 中天建设集团有限公司 Reinforced manhole cover plate of which upper part is provided with stainless steel plates
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