JP2757133B2 - Fall prevention safety chain for manhole of sewer system - Google Patents
Fall prevention safety chain for manhole of sewer systemInfo
- Publication number
- JP2757133B2 JP2757133B2 JP6334528A JP33452894A JP2757133B2 JP 2757133 B2 JP2757133 B2 JP 2757133B2 JP 6334528 A JP6334528 A JP 6334528A JP 33452894 A JP33452894 A JP 33452894A JP 2757133 B2 JP2757133 B2 JP 2757133B2
- Authority
- JP
- Japan
- Prior art keywords
- manhole
- safety chain
- hook
- prevention safety
- chain
- 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 - Lifetime
Links
Landscapes
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、下水道設備におけるマ
ンホ−ル用ステンレス製落下防止安全鎖に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stainless steel fall prevention safety chain for manholes in sewage facilities.
【０００２】[0002]
【従来の技術】一般に、下水道設備におけるマンホ−ル
は、点検または清掃のために人が出入りするために必須
の施設であるが、最近、点検または清掃用器具がロボッ
ト化されてマンホ−ルを小口径化する傾向にある。特
に、下水管に塩ビパイプが採用されてから塩ビ製小口径
マンホ−ルが普及されるようになった。2. Description of the Related Art Generally, manholes in sewage facilities are indispensable facilities for people to enter and exit for inspection or cleaning. Recently, inspection or cleaning equipment has been robotized to remove manholes. The diameter tends to be smaller. In particular, the use of PVC pipes for sewage pipes has led to widespread use of PVC small-diameter manholes.
【０００３】一方、小口径化されたマンホ−ルでも、マ
ンホ−ル蓋を開放した時には、幼児が落下可能な大きさ
になっているので、マンホ−ル内には不慮の転落事故防
止のため、安全ネットを取付けることが要請されてい
る。[0003] On the other hand, even when the manhole is reduced in diameter, the size of the manhole can be dropped when the manhole cover is opened. It is required to install a safety net.
【０００４】かかる安全ネットについて、従来より各種
の提案が行われている（実開昭５０−７４１６０号公
報、実開昭５５−９２７５０号公報、実公平３−４３６
号公報等参照）が、これらの提案のうち、安全ネットに
鎖が使用されたもの、すなわち、前掲の実開昭５０−７
４１６０号公報記載のものでは、マンホ−ル本体の内周
側で等間隔の位置に膨出部を一体的に形成し、これらの
膨出部に上下方向の貫通状係止孔を設け、この貫通状係
止孔にコイルチェ−ンの両端部に設けたフックを係止
し、これらの複数のコイルチェ−ンをマンホ−ル中心部
で交叉させて落下防止安全鎖にしている。Various proposals have been made for such safety nets (Japanese Utility Model Laid-Open No. 50-74160, Japanese Utility Model Laid-Open No. 55-92750, Japanese Utility Model Publication No. 3-436).
Japanese Patent Application Laid-Open Publication No. 50-7) discloses a proposal in which a chain is used for a safety net.
In Japanese Patent No. 4160, bulging portions are integrally formed at equal intervals on the inner peripheral side of the manhole main body, and these bulging portions are provided with vertically extending through-holes. Hooks provided at both ends of the coil chain are locked in the through-holes, and the plurality of coil chains are crossed at the center of the manhole to form a fall prevention safety chain.
【０００５】しかしながら、かかるマンホ−ル用落下防
止安全鎖では、綱を用いたネットと違い、小口径マンホ
−ルに装着するには好都合となるものの、次のような問
題があった。[0005] However, unlike the net using a rope, such a fall prevention safety chain for a manhole is convenient to be attached to a small-diameter manhole, but has the following problems.
【０００６】通常のフックで係止しているので、安全
鎖に下方から何らかの力で作用すると、このフックが外
れるおそれがある。 チェ−ンは略水平状に張設しているので、マンホ−ル
口径が時に大きいものとなると使用困難となる。Since the hook is locked by a normal hook, if the safety chain is acted on from below by any force, the hook may come off. Since the chain is stretched substantially horizontally, it becomes difficult to use when the diameter of the manhole is sometimes large.
【０００７】[0007]
【課題を解決するための手段】そこで本発明は、かかる
問題を解決するためになされたもので、その要旨とする
ところは、１）マンホ−ルの内周に設けた複数の係止孔
に、複数のフック等付チェ−ンをそれぞれ係止した落下
防止安全鎖において、前記チェ−ンを長寸とし、その内
端をマンホ−ルの中心部に位置する若干大径のリングに
連結して、該大径リングを前記係止孔より下方に位置で
きるようにし、前記フック等の少なくとも１つをスナッ
プリンク付のフックで構成したことを特徴とする下水道
設備のマンホ−ル用ステンレス製落下防止安全鎖にあ
り、また、２）請求項１のスナップリンク付のフックを
割リングで構成したことを特徴とする下水道設備のマン
ホ−ル用ステンレス製落下防止安全鎖にある。SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and its gist is as follows. 1) A plurality of locking holes provided in the inner periphery of a manhole. In a fall-prevention safety chain in which a plurality of chains with hooks or the like are locked, the chain is elongated and its inner end is connected to a slightly large-diameter ring located at the center of the manhole. Wherein the large-diameter ring can be positioned below the locking hole, and at least one of the hooks and the like is constituted by a hook with a snap link. 2) A stainless steel fall-prevention safety chain for manholes of sewage facilities, wherein the hook with a snap link according to claim 1 is constituted by a split ring.
【０００８】[0008]
【実施例】本発明を添付図面に示す実施例により詳細に
述べる。図１は本発明の実施例の斜視図、図２は図１の
要部平面図である。BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to an embodiment shown in the accompanying drawings. FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a plan view of a main part of FIG.
【０００９】本発明の実施例は、射出成形された塩ビ製
小口径（例えば、４５０ｍｍφ）マンホ−ルに好適であ
るが、コンクリ−ト製マンホ−ルや宅地内配管用の塩ビ
製ますにも適用できるものである。The embodiment of the present invention is suitable for injection-molded PVC small-diameter (for example, 450 mmφ) manholes, but is also applicable to concrete-made manholes and PVC-made for piping in residential lands. Applicable.
【００１０】図１および図２において、マンホ−ル蓋１
が覆設される塩ビ製蓋枠２は、不図示の塩ビ製小口径マ
ンホ−ル本体の立上り状点検筒部に接着接合される。こ
の蓋枠２の上方側には若干拡径された所の内周に、マン
ホ−ル蓋１を支持するリング状棚１２が形成されてい
る。このリング状棚１２にマンホ−ル蓋１が内嵌されて
支持されると、不図示ロック機構によってマンホ−ル蓋
１はロックされ、みだりに開放できないようになってい
る。Referring to FIGS. 1 and 2, a manhole cover 1 is shown.
The lid frame 2 made of PVC is adhesively bonded to an upright inspection tube portion of a PVC small-diameter manhole body (not shown). On the upper side of the lid frame 2, a ring-shaped shelf 12 for supporting the manhole cover 1 is formed on the inner periphery of the slightly enlarged diameter. When the manhole cover 1 is fitted and supported on the ring-shaped shelf 12, the manhole cover 1 is locked by a lock mechanism (not shown) so that it cannot be opened unintentionally.
【００１１】この蓋枠２のリング状棚１２のすぐ下に
は、縮径状取付フランジ３を周設し、この取付フランジ
３の等間隔の４箇所に張出部４を一体的に形成し、これ
らの張出部４に上下方向の貫通状係止孔５をそれぞれ設
けている。この係止孔５に次のようなステンレス製の安
全鎖１３を着脱可能に装着している。Immediately below the ring-shaped shelf 12 of the lid frame 2, reduced-diameter mounting flanges 3 are provided around the mounting flanges 3, and projecting portions 4 are integrally formed at four equally spaced locations of the mounting flanges 3. The projecting portions 4 are provided with through-holes 5 in the vertical direction. The following stainless steel safety chains 13 are detachably mounted in the locking holes 5.
【００１２】この安全鎖１３は、４本のコイルチェ−ン
８，８…と、これらのコイルチェ−ン８の内端をＳ字リ
ング７を介してそれぞれ連結した若干大径のリング９
と、これらの４本のうち２本のコイルチェ−ン８の外端
をＳ字リング７を介して連結したスナップリンク１０付
のフック６と、他の２本のコイルチェ−ン８の外端を連
結した通常のフック１１と、から構成されている。そし
て、これらのコイルチェ−ン８の長さはマンホ−ル口径
に対し長寸になっているので、装着した状態のリング９
の位置は、フック６，１１の位置より相当低くなってい
る。しかも、安全鎖１３の全体が荒目に簡素化されてい
るので、安全性を確保しながら、固形物を引掛けること
はない。The safety chain 13 has four coil chains 8, 8,..., And a slightly large-diameter ring 9 in which the inner ends of the coil chains 8 are connected via an S-shaped ring 7, respectively.
And a hook 6 with a snap link 10 connecting the outer ends of two of the four coil chains 8 via an S-shaped ring 7 and the outer ends of the other two coil chains 8. And a normal hook 11 connected thereto. Since the length of these coil chains 8 is longer than the diameter of the manhole, the ring 9 in the mounted state is
Is considerably lower than the positions of the hooks 6 and 11. In addition, since the entire safety chain 13 is roughly simplified, no solid matter is caught while ensuring safety.
【００１３】このスナップリンク（当金）１０付のフッ
ク６は、セルフロックフック（茄子環）と呼ばれ、スナ
ップリンク１０の基部はフック６に回転可能に枢支さ
れ、先部はフック６のカギ開口端の内側に弾圧当接され
ていて、フック６のカギ開口部を開閉自在に閉塞するも
のである。The hook 6 with the snap link (a gold) 10 is called a self-locking hook (eggplant ring), and the base of the snap link 10 is rotatably supported by the hook 6, and the tip of the hook 6 is the self-locking hook. It is elastically pressed against the inside of the key opening end and closes the key opening of the hook 6 so that it can be opened and closed.
【００１４】次に、本実施例の安全鎖１３の作用を述べ
る。若干大径のリング９を蓋枠２の中心に位置させ、放
射状になったコイルチェ−ン８の外端のフック６，１１
を蓋枠２の係止孔５に係止させるには、次のようにす
る。マンホ−ル本体に接続された蓋枠２における２つの
係止孔５に、通常のフック１１を係止させてカシメ等を
行って容易に外れないようにする。この係止作業は主と
して生産工場で行う。Next, the operation of the safety chain 13 of this embodiment will be described. A slightly large-diameter ring 9 is positioned at the center of the lid frame 2 and hooks 6 and 11 at the outer ends of the radial coil chain 8 are provided.
Is locked in the locking hole 5 of the lid frame 2 as follows. A normal hook 11 is locked in the two locking holes 5 in the lid frame 2 connected to the manhole body, and caulking or the like is performed so as not to easily come off. This locking work is mainly performed at the production factory.
【００１５】次いで、施工現場において他の係止孔５に
スナップリンク１０付のフック６を係止させる。このと
き、スナップリンク１０付のフック６は、スナップリン
ク１０を弾圧に抗して内側に押し開いて、係止孔５に係
止させるので、以下みだりに外れることなく、また、点
検清掃時には容易に外すことができる。Next, the hook 6 with the snap link 10 is locked in another locking hole 5 at the construction site. At this time, the hook 6 with the snap link 10 pushes the snap link 10 inward against the resilient pressure and locks the snap link 10 in the locking hole 5, so that the hook 6 does not come off unnecessarily and can be easily removed during inspection and cleaning. Can be removed.
【００１６】なお、本実施例はスナップリンク１０付の
フック６を用いているが、本発明はこれに限らず、割リ
ング（スプリットリング）を用いてもよく、また、本発
明はフック１１の代りに、ピンシヤックル（Ｕ字にピン
を挿入したもの）やボルトシヤックル（Ｕ字にボルトを
挿入したもの）を用いてもよいので、これらのシヤック
ルとフック１１を含めて本明細書ではフック等とした。In this embodiment, the hook 6 having the snap link 10 is used. However, the present invention is not limited to this, and a split ring (split ring) may be used. Instead, a pin hackle (a U-shaped pin with a pin inserted) or a bolt hackle (a U-shaped bolt with a bolt inserted) may be used. And
【００１７】[0017]
【発明の効果】本発明によれば、次の効果を奏する。 スナップリンク付のフックを用いたので、安全鎖の取
付け、取外し作業が容易にでき、殊に、点検・清掃時の
取扱いが容易にできる。 長寸のチェ−ンを用いて、若干大径のリングを低い位
置にしたので、マンホ−ル口径が変わっても、量産され
た同一寸法の安全鎖を用いることができる。すなわち、
汎用の安全鎖を提供することができる。 リングが低く垂れ下がった状態でも、いわゆる網目が
拡大可能とするチェ−ンを交叉させた安全鎖と違って、
中心部に若干大径のリングが位置するので、網目の大き
さを拡大させないので、安全性を確保することができ
る。According to the present invention, the following effects can be obtained. Since the hook with the snap link is used, the attachment and detachment of the safety chain can be easily performed, and particularly, the handling during inspection and cleaning can be easily performed. Since the large-diameter ring is slightly lowered using a long chain, even if the diameter of the manhole is changed, mass-produced safety chains of the same dimensions can be used. That is,
A universal safety chain can be provided. Unlike a safety chain with a chain that allows the mesh to expand even when the ring hangs low,
Since a slightly large-diameter ring is located at the center, the size of the mesh is not increased, so that safety can be ensured.
【図１】本発明の実施例の斜視図である。FIG. 1 is a perspective view of an embodiment of the present invention.
【図２】図１の要部平面図である。FIG. 2 is a plan view of a main part of FIG.
２…蓋枠、３…取付フランジ、４…張出部、５…係止
孔、６，１１…フック、８…コイルチェ−ン、９…リン
グ、１０…スナップリンク2 ... lid frame, 3 ... mounting flange, 4 ... overhang, 5 ... locking hole, 6, 11 ... hook, 8 ... coil chain, 9 ... ring, 10 ... snap link
Claims (2)
に、複数のフック等付チェ−ンをそれぞれ係止した落下
防止安全鎖において、 前記チェ−ンを長寸とし、その内端をマンホ−ルの中心
部に位置する若干大径のリングに連結して、該大径リン
グを前記係止孔より下方に位置できるようにし、前記フ
ック等の少なくとも１つをスナップリンク付のフックで
構成したことを特徴とする下水道設備のマンホ−ル用ス
テンレス製落下防止安全鎖。1. A fall prevention safety chain in which a plurality of chains with hooks and the like are respectively locked in a plurality of locking holes provided in an inner periphery of a manhole. The inner end is connected to a slightly large-diameter ring located at the center of the manhole so that the large-diameter ring can be positioned below the locking hole, and at least one of the hooks and the like is provided with a snap link. A stainless steel fall-prevention safety chain for manholes in sewage facilities, characterized by being constructed with hooks.
割リングで構成したことを特徴とする下水道設備のマン
ホ−ル用ステンレス製落下防止安全鎖。2. A stainless steel fall-prevention safety chain for a manhole of a sewer system, wherein the hook with the snap link according to claim 1 is constituted by a split ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6334528A JP2757133B2 (en) | 1994-12-19 | 1994-12-19 | Fall prevention safety chain for manhole of sewer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6334528A JP2757133B2 (en) | 1994-12-19 | 1994-12-19 | Fall prevention safety chain for manhole of sewer system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08170347A JPH08170347A (en) | 1996-07-02 |
| JP2757133B2 true JP2757133B2 (en) | 1998-05-25 |
Family
ID=18278419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6334528A Expired - Lifetime JP2757133B2 (en) | 1994-12-19 | 1994-12-19 | Fall prevention safety chain for manhole of sewer system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2757133B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200285775Y1 (en) * | 2002-05-06 | 2002-08-14 | 서경수 | manhole with safety apparatus |
-
1994
- 1994-12-19 JP JP6334528A patent/JP2757133B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08170347A (en) | 1996-07-02 |
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