JP2002038504A - Fall-preventive auxiliary ladder for manhole - Google Patents
Fall-preventive auxiliary ladder for manholeInfo
- Publication number
- JP2002038504A JP2002038504A JP2000221652A JP2000221652A JP2002038504A JP 2002038504 A JP2002038504 A JP 2002038504A JP 2000221652 A JP2000221652 A JP 2000221652A JP 2000221652 A JP2000221652 A JP 2000221652A JP 2002038504 A JP2002038504 A JP 2002038504A
- Authority
- JP
- Japan
- Prior art keywords
- manhole
- ladder
- support shaft
- ladder member
- opening
- 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
Landscapes
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Ladders (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、マンホール用の転
落防止補助梯子に係り、特に、水が逆流してマンホール
の蓋を押し上げて外れた場合でも常に転落を防止するこ
とができるものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention auxiliary ladder for manholes, and more particularly to a fall prevention auxiliary ladder which can always prevent fall even when water flows backward and pushes up a manhole cover.
【０００２】[0002]
【従来の技術】従来、道路の地中に埋設された下水道等
の入口には、この上部にマンホールの枠体と蓋が設置さ
れている。このマンホール内に作業者が入って作業する
ときは、蓋を開けマンホール内壁に設けたステップに円
滑に足をかけるために、マンホール枠体から起立する補
助梯子を取り付けている。そして、作業者がマンホール
内に入った時、開口したマンホールから物が落下して作
業者に危害を与えたり、開口しているマンホールから人
間が転落したりすることを防止するために、この補助梯
子を利用してマンホールの開口を覆う防護枠としてい
る。2. Description of the Related Art Heretofore, a manhole frame and a lid have been installed above an entrance of a sewer or the like buried underground on a road. When a worker enters the manhole and works, an auxiliary ladder standing up from the manhole frame is attached in order to open the lid and smoothly step on a step provided on the inner wall of the manhole. When the worker enters the manhole, this auxiliary work is performed to prevent the object from dropping from the opened manhole and harming the worker, and to prevent the human from falling from the opened manhole. A protective frame is used to cover the opening of the manhole using a ladder.
【０００３】しかし、マンホールに入った作業者の作業
が終了すると、梯子部材が外され、マンホールの開口部
に蓋が載せられる。このため、洪水により下水道から水
が逆流してマンホールの蓋を押し上げて外すことがあっ
た場合、マンホールの蓋が開いていることに気付かない
歩行者が誤ってマンホール内に転落するおそれがある。[0003] However, when the worker who has entered the manhole completes the work, the ladder member is removed and the lid is placed on the opening of the manhole. For this reason, when water flows backward from the sewer due to flooding and pushes up and removes the manhole cover, a pedestrian who does not notice that the manhole cover is open may fall into the manhole by mistake.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、水が逆流し
てマンホールの蓋を押し上げて外れた場合でも外れない
ようにしたマンホール用の転落防止補助梯子を提供する
ことを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a fall prevention auxiliary ladder for a manhole, which is prevented from coming off even when water is backflowed and the manhole cover is pushed up and comes off.
【０００５】[0005]
【課題を解決するための手段】かかる目的を達成するた
めに、本発明の請求項１のマンホール用の転落防止補助
梯子は、マンホールの開口部内に渡設される長さを有し
対向して設けられる一対の縦棒とこの縦棒間に設けられ
た横棒からなる梯子部材からなり、上記一対の縦棒の両
端部を開口部の一方の端部に設けられた一対の支持軸部
と他方の端部に設けられた一対の係合受部との間に渡設
されて取り付けられるマンホール用の転落防止補助梯子
であって、上記縦棒の一方の端部に、上記支持軸部に載
置されるとともにこれに沿って移動可能な滑り部と、上
記滑り部の根幹側に連続する係止凹部とを設け、上記縦
棒の他方の端部に、上記係合受部と対向して配置され上
記係合受部との間で互いに係合して上下方向への移動を
規制する係合部を設け、上記梯子部材を上記開口部内に
略水平に位置させて上記縦棒の他方の端部を上記係合受
部側に移動させたとき、上記縦棒の一方の端部は、上記
滑り部を上記支持軸部に載置され、且つこの先端側に移
動して保持されるとともに、縦棒の他方の端部は、上記
係合部が上記係合受部に係合して保持され、また、上記
縦棒の一方の端部に、上記梯子部材を上記支持軸部を中
心に略垂直方向に回動したとき、上記係止凹部に上記支
持軸部が係止されるまで滑らせた状態でマンホール開口
部の支持軸部側周縁部に形成した受座に当接して上記梯
子部材を起立状態に保持するストッパーと、上記滑り部
の根幹部側に揺動可能に吊り下げられ上記梯子部材を起
立状態にしたとき上記支持軸部に係止される係止フック
とを設け、また、上記梯子部材には、上記マンホール開
口部の支持軸部側周縁部に形成された係止座に対してそ
の下面に当接してその上方への移動を規制し、且つ上記
係止座に当接して支持軸部側への移動を規制するロック
体を係脱自在に設けたことを特徴とする。In order to achieve the above object, a fall prevention auxiliary ladder for a manhole according to a first aspect of the present invention has a length extending in an opening of a manhole and opposed to each other. It consists of a ladder member consisting of a pair of vertical bars provided and a horizontal bar provided between the vertical bars, and a pair of support shafts provided at both ends of the pair of vertical bars at one end of the opening. A fall prevention auxiliary ladder for a manhole which is attached to a pair of engagement receiving portions provided at the other end, and is provided at one end of the vertical bar, at the support shaft portion. A sliding portion that is placed and movable along the sliding portion, and a locking recess that is continuous on the root side of the sliding portion is provided. The other end of the vertical bar faces the engagement receiving portion. An engagement portion that is arranged at a position and that engages with the engagement receiving portion to regulate movement in the vertical direction. When the ladder member is positioned substantially horizontally in the opening and the other end of the vertical bar is moved toward the engagement receiving portion, one end of the vertical bar is connected to the sliding portion. Is placed on the support shaft portion, and is moved to and held at the distal end side, and the other end of the vertical bar is held by the engagement portion engaging with the engagement receiving portion, Further, when the ladder member is rotated in a substantially vertical direction around the support shaft at one end of the vertical bar, the ladder member is slid until the support shaft is locked in the locking recess. A stopper for holding the ladder member in an upright state by abutting on a support formed on the support shaft side peripheral portion of the manhole opening in the state, and the ladder suspended swingably to a root portion side of the sliding portion. A locking hook that is locked to the support shaft when the member is in an upright state, and the ladder member has The lower surface of the locking seat formed on the supporting shaft portion side peripheral portion of the manhole opening is restricted to move upward by contacting the lower surface thereof, and the locking seat is contacted to the supporting shaft portion side. A lock body for restricting the movement of the lock member is provided so as to be freely disengageable.
【０００６】また、本発明の請求項２のマンホール用の
転落防止補助梯子は、請求項１のマンホール用の転落防
止補助梯子において、上記受座に、ストッパー当接位置
の中心部側に樹立した壁面を有する凸部を形成し、上記
ストッパーに上記壁面に略直角に当接する調節ボルトを
設けたことを特徴とする。A fall prevention auxiliary ladder for a manhole according to a second aspect of the present invention is the support fall ladder for a manhole according to the first aspect, which is established at the center of the stopper at the stopper contact position. A convex portion having a wall surface is formed, and an adjusting bolt is provided on the stopper so as to abut on the wall surface at a substantially right angle.
【０００７】[0007]
【作用】本発明の請求項１のマンホール用の転落防止補
助梯子では、上記梯子部材を上記開口部内に略水平に位
置させた状態で梯子部材の係合部が開口部の係合受部か
ら上方及び支持軸部側への移動を規制するロック体を備
えている。これで、梯子部材は、縦棒の一方の端部の滑
り部を上記支持軸部に載置するとともに他方の端部の係
合部を開口部の係合受部に係合させた略水平の収容時に
おいて、ロック体を手操作し、その先端をマンホール開
口部の支持軸部側周縁部に形成された係止座に対してそ
の下面に当接してその上方への移動を規制するととも
に、上記係止座に当接して支持軸部側への移動を規制す
る。In the fall prevention auxiliary ladder for a manhole according to the first aspect of the present invention, the engaging portion of the ladder member is moved from the engagement receiving portion of the opening with the ladder member positioned substantially horizontally in the opening. A lock body is provided for restricting movement to the upper side and the support shaft side. Thus, the ladder member has a substantially horizontal portion in which the sliding portion at one end of the vertical bar is placed on the support shaft portion and the engaging portion at the other end is engaged with the engaging receiving portion of the opening. When the lock body is stored, the lock body is manually operated, and the tip of the lock body abuts against the lower surface of the locking seat formed on the supporting shaft side peripheral portion of the manhole opening to restrict the upward movement. The abutment with the locking seat restricts the movement toward the support shaft.
【０００８】これにより、梯子部材は、洪水等により下
水道から水が逆流してマンホールの蓋を押し上げ、蓋が
外れた場合にも、上記梯子部材は開口部から外れず、常
に防護枠の機能を果たし、歩行者が誤ってマンホール内
へ転落することを未然に防止できる。[0008] Accordingly, the ladder member does not come off from the opening even when the lid is removed due to the backflow of water from the sewer due to flooding or the like, and the ladder member always functions as a protective frame. As a result, it is possible to prevent a pedestrian from falling into the manhole by mistake.
【０００９】また、上記梯子部材は、上記支持軸部を中
心にした略垂直方向への回動時に、この梯子部材の滑り
部が支持軸部上を移動して根幹側の係止凹部に係止され
るまで滑らせ、マンホール開口部における支持軸側周縁
部に形成した受座にストッパーが当接して上記梯子部材
を起立状態に保持する。更に、梯子部材の起立時には、
上記滑り部の根幹部に揺動可能に吊り下げた係止フック
が自重で上記支持軸部に係止し、上下方向への移動を規
制する。In addition, when the ladder member rotates in a substantially vertical direction about the support shaft, the sliding portion of the ladder member moves on the support shaft and engages with the locking recess on the root side. The ladder member is slid until stopped, and the stopper comes into contact with a seat formed on the supporting shaft side peripheral portion of the manhole opening to hold the ladder member upright. Furthermore, when the ladder member stands,
A locking hook, which is swingably hung on the base of the sliding portion, locks to the support shaft portion by its own weight and regulates the movement in the vertical direction.
【００１０】しかして、上記梯子部材は、上記支持軸部
を中心に開口部の支持軸側周縁部に略垂直方向に安定し
た姿勢で固定される。これで、マンホール内に入る作業
者はこの補助梯子を利用して安全且つ容易に昇降動作を
することができる。[0010] Thus, the ladder member is fixed to the peripheral portion of the opening on the support shaft side centering on the support shaft portion in a substantially vertically stable posture. Thus, the worker entering the manhole can safely and easily perform the elevating operation using the auxiliary ladder.
【００１１】また、請求項２のマンホール用の転落防止
補助梯子では、上記マンホール開口部の支持軸部側周縁
部に形成した受座に、ストッパー当接位置の中心部側に
樹立した壁面を有する凸部を形成しており、ストッパー
に、上記壁面に略直角に当接する調節ボルトを設けてい
るから、上記支持軸部を中心に略垂直方向に回動時に、
ストッパーが上記受座に当接すると同時に、調節ボルト
が上記凸部の壁面に当接し、ガタツキなく受け止めるこ
とができるので、支持軸と係止凹部の間の隙間による梯
子部材の前後方向のガタツキは解消され、これにより、
梯子部材は使用状態の略垂直状態において、マンホール
の開口部に一層安定して保持され、作業者が安全且つ容
易にマンホール内に出入りできる。According to the second aspect of the present invention, the fall ladder for manholes has a wall formed on the center side of the stopper abutting position in the seat formed on the periphery of the manhole opening on the side of the support shaft. Since the convex portion is formed, and the stopper is provided with an adjusting bolt that abuts on the wall surface at a substantially right angle, when rotating substantially vertically around the support shaft portion,
At the same time as the stopper comes into contact with the receiving seat, the adjusting bolt comes into contact with the wall surface of the convex portion and can be received without rattling. Therefore, the rattling of the ladder member in the longitudinal direction due to the gap between the support shaft and the locking concave portion is reduced. Is eliminated,
The ladder member is more stably held in the opening of the manhole in the substantially vertical state of use, so that the worker can safely and easily enter and exit the manhole.
【００１２】[0012]
【発明の実施の形態】以下、図１〜図７を参照してマン
ホール用の転落防止補助梯子の第１実施形態を説明す
る。図１，図２に示すように、転落防止補助梯子１００
は、マンホール１における円形枠体３の開口部５内に配
置される構造になっている。上記開口部５内における上
側周縁部６は、テーパー状に形成され、これに蓋８が嵌
合し、路面Ｌに対して面一に露出するようにしている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a fall prevention auxiliary ladder for a manhole will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the fall prevention auxiliary ladder 100
Has a structure arranged in the opening 5 of the circular frame 3 in the manhole 1. The upper peripheral portion 6 in the opening 5 is formed in a tapered shape, and the lid 8 is fitted to the upper peripheral portion 6 so as to be flush with the road surface L.
【００１３】上記転落防止補助梯子１００の主要部とな
る梯子部材１０は、マンホール１の開口部５内に渡設さ
れる長さを有し、対向して設けられる一対の縦棒１１，
１１と、この縦棒間に設けられた一乃至複数の横棒１２
とからなる。上記梯子部材１０は、一対の縦棒１１の両
端部１１Ａ，１１Ｂを上記開口部５の一方の端部５Ａに
設けた一対の支持軸部７，７と、これに対向する他方の
端部５Ｂに設けた凸状部材からなる一対の係合受部９，
９との間に渡設されて取り付けられる。A ladder member 10, which is a main part of the fall prevention auxiliary ladder 100, has a length that extends in the opening 5 of the manhole 1 and has a pair of vertical bars 11,
11 and one or more horizontal bars 12 provided between the vertical bars.
Consists of The ladder member 10 includes a pair of support shafts 7, 7 having both ends 11A, 11B of a pair of vertical bars 11 provided at one end 5A of the opening 5, and the other end 5B opposed thereto. A pair of engagement receiving portions 9 made of a convex member provided in
9 and attached.
【００１４】上記梯子部材１０における縦棒１１の一方
の端部１１Ａには、上記支持軸部７，７に載置されると
ともに、これに沿って移動可能な滑り部１５を設けてい
る。この滑り部１５の根幹側１５Ａに係止凹部１５Ｃを
設けている。尚、先端側１５Ｂに鉤状部１５Ｄを設けて
いるが、これはなくても良い。更に、上記梯子部材１０
の滑り部１５には、Ｌ型形状のストッパー１７を付設し
ている。このストッパー１７は、図３，図４に示すよう
に、上記支持軸部７，７を中心に略垂直方向に回動した
とき、この梯子部材１０の滑り部１５における根幹側１
５Ａの係止凹部１５Ｃに支持軸部７，７が係止されるま
で滑って止まり、この状態で、マンホール１の開口部５
の支持軸部側周縁部に形成した受座６Ｂに上記ストッパ
ー１７の先端１７Ａが当接し，上記梯子部材１０を起立
状態に保持する。また、滑り部１５の根幹側１５Ａに揺
動可能の係止フック１９を設け、上記梯子部材１０を起
立状態にしたとき、自重で上記支持軸部７，７に係止さ
れるようになっている。At one end 11A of the vertical bar 11 of the ladder member 10, there is provided a sliding portion 15 which is placed on the support shafts 7, 7 and is movable along the shaft. A locking recess 15C is provided on the base side 15A of the sliding portion 15. In addition, although the hook-shaped portion 15D is provided on the distal end side 15B, this may not be provided. Further, the ladder member 10
The sliding portion 15 is provided with an L-shaped stopper 17. As shown in FIGS. 3 and 4, when the stopper 17 is rotated in a substantially vertical direction about the support shafts 7, 7, the stopper 1 of the ladder member 10 at the root side 1 of the sliding portion 15 is rotated.
5A stops until the support shafts 7, 7 are locked in the locking recesses 15C of the manhole 1 in this state.
The tip 17A of the stopper 17 comes into contact with the receiving seat 6B formed at the peripheral edge of the supporting shaft portion, thereby holding the ladder member 10 upright. Further, a swingable locking hook 19 is provided on the base side 15A of the sliding portion 15, and when the ladder member 10 is in an upright state, the ladder member 10 is locked by the support shafts 7, 7 by its own weight. I have.
【００１５】更に、図３，図４に示すように、上記受座
６Ｂには、ストッパー１７の当接位置の中心部側に樹立
した壁面６Ｃを有する凸部６Ｄを形成している。そし
て、ストッパー１７には、上記壁面６Ｃに略直角に当接
する調節ボルトＢをロックナットＢ１とともに設けてい
る。そして、調節ボルトＢを適宜の突出量にセットして
おくことで、上記支持軸部７を中心に略垂直方向に回動
時に、ストッパー１７が受座６Ｂに当接すると同時に、
調節ボルトＢが上記凸部６Ｄの壁面６Ｃに当接し、前後
方向にもガタツキなく受け止めることができるようにし
ている。Further, as shown in FIGS. 3 and 4, the receiving seat 6B is formed with a convex portion 6D having a wall surface 6C established on the center side of the contact position of the stopper 17. The stopper 17 is provided with an adjustment bolt B, which comes into contact with the wall 6C at a substantially right angle, together with the lock nut B1. When the adjusting bolt B is set to an appropriate amount of protrusion, the stopper 17 comes into contact with the receiving seat 6B when the stopper 17 comes into contact with the support shaft portion 7 in a substantially vertical direction around the support shaft portion 7.
The adjustment bolt B comes into contact with the wall surface 6C of the convex portion 6D so that it can be received in the front-rear direction without rattling.
【００１６】一方、図１，図２に示すように、上記梯子
部材１０を上記開口部５内に略水平に位置させたとき、
上記縦棒１１の一方の端部１１Ａ，１１Ａは、上記滑り
部１５，１５を上記支持軸部７，７に載置して係止凹部
１５Ｃと鉤状部１５Ｄ間を移動可能に支持されている。
図５に示すように、上記縦棒１１，１１の他方の端部１
１Ｂ，１１Ｂには、凹状部材の係合部１３，１３が外向
きに付設されている。この係合部１３，１３は、上記凸
状部材からなる係合受部９，９と対向して配置され、こ
の係合受部との間で互いに係合するとき、上下方向への
移動が規制される。上記梯子部材１０の操作で、他方の
端部１１Ｂ，１１Ｂの係合部１３，１３を上記係合受部
９，９側へ移動させたとき、係合部１３，１３が係合受
部９，９に係合するとともに、上記支持軸部７，７に載
置された上記梯子部材１０の滑り部１５，１５がこの先
端側１５Ｂの鉤状部１５Ｄ側に移動して略水平に保持さ
れる。On the other hand, as shown in FIGS. 1 and 2, when the ladder member 10 is positioned substantially horizontally in the opening 5,
One ends 11A, 11A of the vertical bar 11 are movably supported between the locking recess 15C and the hook-like portion 15D by placing the sliding portions 15, 15 on the support shafts 7, 7, respectively. I have.
As shown in FIG. 5, the other ends 1 of the vertical bars 11, 11 are provided.
1B, 11B are provided with engaging portions 13, 13 of concave members facing outward. The engagement portions 13, 13 are arranged to face the engagement receiving portions 9, 9 made of the above-mentioned convex member, and when they are engaged with each other with the engagement receiving portions, the movement in the vertical direction is prevented. Be regulated. When the engaging portions 13, 13 of the other end portions 11B, 11B are moved to the engaging receiving portions 9, 9 by operating the ladder member 10, the engaging portions 13, 13 become , 9 and the sliding portions 15, 15 of the ladder member 10 placed on the support shaft portions 7, 7 are moved toward the hook-like portions 15D on the distal end 15B and are held substantially horizontally. You.
【００１７】尚、上記係合部１３，１３と係合受部９，
９との係合構造は、図８に示すように、上記係合部１３
を凸状形状の係合部１３Ａとし、係合受部９を凹状形状
の係合受部９Ａとしても良い。The engagement portions 13, 13 and the engagement receiving portions 9,
As shown in FIG.
May be an engagement portion 13A having a convex shape, and the engagement receiving portion 9 may be an engagement receiving portion 9A having a concave shape.
【００１８】更に、図９に示すように、マンホール１
は、その開口部５における上側周縁部６に凸縁６Ｘを持
ち、その他方の端部５Ｂに設けた一対の係合受部９Ｂ
は、上面９Ｃと下斜面９Ｄとからなるものが採用されて
いる場合もある。これに係合する係合部１３Ｂは、凸縁
６Ｘの下面６Ｚに係止する突出面１３Ｃと、上面９Ｃに
係合する上部係止面１３Ｄとからなる構成としても良
い。Further, as shown in FIG.
Has a convex edge 6X on the upper peripheral edge 6 in the opening 5 and a pair of engagement receiving portions 9B provided on the other end 5B.
In some cases, an upper surface 9C and a lower slope 9D are used. The engaging portion 13B that engages with this may be configured to include a projecting surface 13C that engages with the lower surface 6Z of the protruding edge 6X and an upper engaging surface 13D that engages with the upper surface 9C.
【００１９】上記設計変更に係る２つの変形実施形態に
おける上記係合部１３Ａ又は１３Ｂと係合受部９Ａ又は
９Ｂとの係合構造においても、互いに係合するとき上下
方向への移動が規制される。In the engagement structure between the engagement portion 13A or 13B and the engagement receiving portion 9A or 9B in the two modified embodiments according to the design change, the vertical movement when engaging with each other is restricted. You.
【００２０】更に、上記梯子部材１０の横棒１２，１２
の中央位置には、ロック体２０を設けている。上記ロッ
ク体２０は、上記マンホール開口部５の支持軸部側周縁
部に形成された係止座６Ｅに対して、その下面６Ｆに当
接してその上方への移動を規制するとともに、係止座６
Ｅに当接して支持軸部７，７側への移動を規制する。上
記ロック体２０の構造をさらに詳細に説明すると、図６
に示すように、まず、２本の横棒１２，１２間に２つの
支持板２３，２５をボルト２７，２７で取付けている。
この支持板２５に軸受２９を設け、この軸受２９に垂直
支軸３１を樹立させ、この垂直支軸３１の上端にロック
体２０の基端を取付けるとともに、これを垂直支軸３１
に捲装したコイルバネ３３により浮上させている。上記
ロック体２０の自由端２０Ａ側には、上向きの止ピン３
５を樹立させている。これで、ロック体２０は自由に回
動可能であり、ロック体２０の自由端２０Ａが係止座６
Ｅに対して、その下面６Ｆに当接してその上方への移動
を規制するとともに、止ピン３５が係止座６Ｅに当接し
て梯子部材１０が支持軸部７，７側へ移動するのを規制
する。Further, the horizontal bars 12, 12 of the ladder member 10 are provided.
A lock body 20 is provided at a central position of the lock. The lock body 20 abuts against a lower surface 6F of a locking seat 6E formed on a peripheral portion of the manhole opening 5 on the side of the support shaft to regulate upward movement of the locking seat 6E. 6
Abuts on E to regulate the movement toward the support shafts 7,7. The structure of the lock body 20 will be described in more detail.
As shown in (1), first, two support plates 23, 25 are mounted between the two horizontal bars 12, 12 with bolts 27, 27.
A bearing 29 is provided on the support plate 25, a vertical support shaft 31 is established on the bearing 29, and a base end of the lock body 20 is attached to the upper end of the vertical support shaft 31.
And is levitated by a coil spring 33 wound around. On the free end 20A side of the lock body 20, an upward locking pin 3
5 have been established. Thus, the lock body 20 can freely rotate, and the free end 20A of the lock body 20 is
E, the lower pin 6F contacts the lower surface 6F to restrict the upward movement, and the locking pin 35 contacts the locking seat 6E to prevent the ladder member 10 from moving toward the support shaft 7,7. regulate.
【００２１】尚、上記ロック体２０は、図１０に示すよ
うに、凸状の係止座６Ｅに対して、その自由端２０Ａを
上下二股状の凹部２０Ｂとしても良い。また、図１１に
示すように、逆に凹状の係止座６Ｅに対して、その自由
端２０Ａを１本の平板２０Ｃとしても良い。これらの構
成によっても、ロック体２０の自由端２０Ａが係止座６
Ｅに対して、その上下方向への移動を規制するととも
に、係止座６Ｅに当接して梯子部材１０が支持軸部７，
７側へ移動するのを規制する。As shown in FIG. 10, the lock body 20 may be configured such that a free end 20A thereof is a bifurcated concave portion 20B with respect to a convex locking seat 6E. Alternatively, as shown in FIG. 11, the free end 20A of the concave locking seat 6E may be a single flat plate 20C. Even with these configurations, the free end 20A of the lock body 20 is
In addition to restricting the vertical movement of the ladder member E, the ladder member 10 comes into contact with the locking seat 6E and the support shaft portion 7,
The movement to the side 7 is restricted.
【００２２】第１実施形態のマンホール用の転落防止補
助梯子１００は、上記のように構成されており、以下の
ように作用する。本実施形態のマンホール用の転落防止
補助梯子１００によると、梯子部材１０は、マンホール
１の開口部５に設けた支持軸部７，７と対向する位置
に、梯子部材１０の他方の端部１１Ｂの係合部１３が開
口部５の係合受部９と係合した状態で、梯子部材１０が
上方及び支持軸部７，７側へ移動できないようにするロ
ック体２０を備えている。これにより、梯子部材１０
は、この縦棒１１の一方の端部１１Ａの滑り部１５を上
記支持軸部７に載置するとともに他方の端部１１Ｂの係
合部１３を開口部５の係合受部９側に移動して係合さ
せ、この略水平での収容時において、ロック体２０を手
操作し、その先端２０Ａを上記係止座６Ｅに対してその
下面６Ｆに当接させて上方への移動を規制し、且つ係止
座６Ｅに当接させて支持軸部側への移動を規制する。し
かして、梯子部材１０は、その両端部１１Ａ，１１Ｂ
が、上方からも下方からも係止されて略水平に保持され
た状態となる。The fall prevention auxiliary ladder 100 for manholes of the first embodiment is configured as described above, and operates as follows. According to the fall prevention auxiliary ladder 100 for a manhole of the present embodiment, the ladder member 10 is located at a position facing the support shafts 7, 7 provided in the opening 5 of the manhole 1, the other end 11 </ b> B of the ladder member 10. The ladder member 10 is provided with a lock body 20 for preventing the ladder member 10 from moving upward and toward the support shafts 7 and 7 in a state where the engaging portion 13 is engaged with the engagement receiving portion 9 of the opening 5. Thereby, the ladder member 10
Puts the sliding portion 15 of one end 11A of the vertical rod 11 on the support shaft 7 and moves the engaging portion 13 of the other end 11B toward the engagement receiving portion 9 of the opening 5. When the lock body 20 is stored in the substantially horizontal position, the lock body 20 is manually operated, and the distal end 20A is brought into contact with the lower surface 6F of the locking seat 6E to restrict upward movement. And, it is brought into contact with the locking seat 6E to restrict the movement toward the support shaft. Thus, the ladder member 10 has both ends 11A, 11B.
However, it is locked from above and below and is held substantially horizontally.
【００２３】従って、洪水等により下水道から水が逆流
してマンホール１の蓋８を押し上げて外れた場合でも、
上記梯子部材１０は常に開口部５から外れない。このた
め、防護枠の機能を果たし、歩行者が誤ってマンホール
内へ転落することを未然に防止できる。Therefore, even if the water flows backward from the sewer due to flooding or the like and the lid 8 of the manhole 1 is pushed up and comes off,
The ladder member 10 does not always come off the opening 5. For this reason, it functions as a protective frame and can prevent a pedestrian from accidentally falling into the manhole.
【００２４】また、作業者がマンホール１に出入りする
時は、上記梯子部材１０は、上記支持軸部７，７を中心
にした略垂直方向への回動操作をする。この操作で梯子
部材１０の滑り部１５は、支持軸部７、７上を移動して
根幹側の係止凹部１５Ｃに係止されるまで滑らせ、マン
ホール１の開口部５における支持軸部側周縁部に形成し
た受座６Ｂにストッパー１７が当接して上記梯子部材を
起立状態に保持する。更に、梯子部材１０の起立時に
は、上記滑り部の根幹部に揺動可能に吊り下げた係止フ
ック１９が自重で上記支持軸部７に係止し、上下方向に
移動できないように固定される。When the worker enters and exits the manhole 1, the ladder member 10 is rotated about the support shafts 7, 7 in a substantially vertical direction. With this operation, the sliding portion 15 of the ladder member 10 moves on the support shaft portions 7 and 7 until it is locked by the locking recess 15C on the root side, and slides on the support shaft portion side at the opening 5 of the manhole 1. The stopper 17 abuts on the receiving seat 6B formed on the peripheral edge portion to hold the ladder member in an upright state. Further, when the ladder member 10 stands up, the locking hook 19 swingably hung on the base of the slide portion is locked by its own weight to the support shaft portion 7 and is fixed so as not to move in the vertical direction. .
【００２５】これにより、上記梯子部材１０は、上記支
持軸部７を中心に受座６Ｂにストッパー１７を当接して
略垂直方向に安定した姿勢で固定され、上下方向へのガ
タツキが発生することなく、マンホール内に入る作業者
は安心して補助梯子を使用しての昇降動作ができる。As a result, the ladder member 10 is fixed in a substantially vertically stable posture by contacting the stopper 17 with the receiving seat 6B about the support shaft portion 7, and rattling in the vertical direction occurs. In addition, the worker who enters the manhole can move up and down using the auxiliary ladder with ease.
【００２６】更に、上記受座６Ｂに、ストッパー１７の
当接位置の中心部側に樹立した壁面６Ｃを有する凸部６
Ｄを形成し、ストッパー１７に、上記壁面６Ｃに直角に
当接する調節ボルトＢをロックナットＢ１とともに設け
ているから、調節ボルトＢを適宜の突出量にセットして
おくことで、上記支持軸部７を中心に略垂直方向に回動
時に、ストッパー１７が受座６Ｂに当接すると同時に、
調節ボルトＢが上記凸部６Ｄの壁面６Ｃに当接し、ガタ
ツキなく受け止めることができるようになり、支持軸部
７と係止凹部１５Ｃとの間の隙間による梯子部材１０の
前後方向のガタツキが除去される。Further, a convex portion 6 having a wall surface 6C established on the center side of the contact position of the stopper 17 is provided on the receiving seat 6B.
D is formed, and the stopper 17 is provided with the adjustment bolt B that abuts at right angles to the wall surface 6C together with the lock nut B1. When the stopper 17 comes into contact with the receiving seat 6B when rotating in a substantially vertical direction around the center 7,
The adjusting bolt B comes into contact with the wall surface 6C of the convex portion 6D and can be received without rattling, so that rattling in the front-rear direction of the ladder member 10 due to a gap between the support shaft portion 7 and the locking concave portion 15C is removed. Is done.
【００２７】しかして、梯子部材１０は、使用状態の略
垂直状態において、マンホール１の開口部５に一層安定
して保持され、作業者が安全且つ容易にマンホール内に
出入りすることができる。Thus, the ladder member 10 is more stably held in the opening 5 of the manhole 1 in a substantially vertical state of use, so that an operator can safely and easily enter and exit the manhole.
【００２８】[0028]
【発明の効果】請求項１のマンホール用の転落防止補助
梯子によると、梯子部材は、洪水等により下水道から水
が逆流してマンホールの蓋を押し上げて外れた場合に
も、上記梯子部材は開口部から外れず、常に防護枠の機
能を果たし、歩行者が誤ってマンホール内へ転落するこ
とを未然に防止できる。According to the fall prevention auxiliary ladder for a manhole according to the first aspect, the ladder member can be opened even when water flows backward from the sewer due to flooding or the like and pushes up the manhole cover and comes off. It does not come off, and always functions as a protective frame, and can prevent pedestrians from accidentally falling into the manhole.
【００２９】また、上記梯子部材は、上記支持軸部を中
心にした略垂直方向への回動時に、上記支持軸部を中心
に開口部の周縁部に略垂直方向に安定した姿勢で固定さ
れる。これで、マンホール内に入る作業者はこの補助梯
子を利用して安全且つ容易に昇降動作をすることができ
る。Further, the ladder member is fixed to the peripheral portion of the opening in a substantially vertically stable position about the support shaft when the ladder member is rotated in the substantially vertical direction about the support shaft. You. Thus, the worker entering the manhole can safely and easily perform the elevating operation using the auxiliary ladder.
【００３０】また、請求項２のマンホール用の転落防止
補助梯子によると、支持軸部を中心に略垂直方向に回動
時に、ストッパーが上記開口部の周縁部に受け止められ
るとともに、両部材間に残る隙間による梯子部材の前後
方向の揺れは、調節ボルトにより解消される。これによ
り、梯子部材は使用状態の略垂直状態において、マンホ
ールの開口部に一層安定して保持され、作業者が安全且
つ容易にマンホール内に出入りできる。According to the auxiliary fall ladder for a manhole according to the second aspect, the stopper is received by the peripheral portion of the opening when rotating substantially vertically about the support shaft, and is provided between the two members. The swing of the ladder member in the front-back direction due to the remaining gap is eliminated by the adjustment bolt. As a result, the ladder member is more stably held in the opening of the manhole in the substantially vertical state of use, and the worker can safely and easily enter and exit the manhole.
【図１】本発明の第１実施形態を示し、マンホール用転
落防止補助梯子の平面図である。FIG. 1 is a plan view of a fall prevention auxiliary ladder for manholes, showing a first embodiment of the present invention.
【図２】本発明の第１実施形態を示し、マンホール用転
落防止補助梯子の断面図である。FIG. 2 shows the first embodiment of the present invention and is a cross-sectional view of a fall prevention auxiliary ladder for manholes.
【図３】本発明の第１実施形態を示し、マンホール用転
落防止補助梯子の要部の断面図である。FIG. 3 shows the first embodiment of the present invention and is a cross-sectional view of a main part of a fall prevention auxiliary ladder for manholes.
【図４】本発明の第１実施形態を示し、支持軸部の平面
図である。FIG. 4 shows the first embodiment of the present invention and is a plan view of a support shaft.
【図５】本発明の第１実施形態を示し、係合受部と係合
部の正面図である。FIG. 5 shows the first embodiment of the present invention, and is a front view of an engagement receiving portion and an engagement portion.
【図６】本発明の第１実施形態を示し、ロック体の正面
図である。FIG. 6 shows the first embodiment of the present invention and is a front view of a lock body.
【図７】本発明の第１実施形態を示し、ロック体の要部
の正面図である。FIG. 7 shows the first embodiment of the present invention and is a front view of a main part of a lock body.
【図８】本発明の第２実施形態を示し、係合受部と係合
部の断面図である。FIG. 8 shows the second embodiment of the present invention, and is a cross-sectional view of an engagement receiving portion and an engagement portion.
【図９】本発明の第３実施形態を示し、係合受部と係合
部の斜視図と断面図である。FIG. 9 shows a third embodiment of the present invention, and is a perspective view and a sectional view of an engagement receiving portion and an engagement portion.
【図１０】本発明の第４実施形態を示し、ロック体の正
面図である。FIG. 10 shows a fourth embodiment of the present invention, and is a front view of a lock body.
【図１１】本発明の第５実施形態を示し、ロック体の正
面図である。FIG. 11 shows a fifth embodiment of the present invention and is a front view of a lock body.
１ マンホール ３ 枠体 ５ 開口部 ５Ａ 一方の端部 ５Ｂ 他方の端部 ６ 上側周縁部 ６Ｂ 受座 ６Ｃ 壁面 ６Ｄ 凸部 ６Ｅ 係止座 ６Ｆ 下面 ７ 支持軸部 ９，９Ａ，９Ｂ 係合受部 １０ 梯子部材 １１ 縦棒 １１Ａ 一方の端部 １１Ｂ 他方の端部 １２ 横棒 １３，１３Ａ，１３Ｂ 係合部 １５ 滑り部 １５Ａ 根幹側 １５Ｂ 先端側 １５Ｃ 係止凹部 １５Ｄ 鉤状部 １７ ストッパー １７Ａ 先端 １９ 係止フック ２０ ロック体 ２０Ａ 先端 ２０Ｂ 凹部 Ｂ 調節ボルト １００ マンホール用の転落防止補
助梯子DESCRIPTION OF SYMBOLS 1 Manhole 3 Frame 5 Opening 5A One end 5B The other end 6 Upper peripheral part 6B Receiving seat 6C Wall surface 6D Convex part 6E Locking seat 6F Lower surface 7 Supporting shaft part 9, 9A, 9B Engagement receiving part 10 Ladder member 11 Vertical bar 11A One end 11B The other end 12 Horizontal bar 13, 13A, 13B Engagement part 15 Sliding part 15A Root side 15B Tip side 15C Locking recessed part 15D Hook-shaped part 17 Stopper 17A Tip 19 Lock Hook 20 Lock body 20A Tip 20B Recess B Adjusting bolt 100 Fall prevention auxiliary ladder for manhole
Claims (2)
を有し対向して設けられる一対の縦棒とこの縦棒間に設
けられた横棒からなる梯子部材からなり、上記一対の縦
棒の両端部を開口部の一方の端部に設けられた一対の支
持軸部と他方の端部に設けられた一対の係合受部との間
に渡設されて取り付けられるマンホール用の転落防止補
助梯子であって、上記縦棒の一方の端部に、上記支持軸
部に載置されるとともにこれに沿って移動可能な滑り部
と、上記滑り部の根幹側に連続する係止凹部とを設け、
上記縦棒の他方の端部に、上記係合受部と対向して配置
され上記係合受部との間で互いに係合して上下方向への
移動を規制する係合部を設け、上記梯子部材を上記開口
部内に略水平に位置させて上記縦棒の他方の端部を上記
係合受部側に移動させたとき、上記縦棒の一方の端部
は、上記滑り部を上記支持軸部に載置され、且つこの先
端側に移動して保持されるとともに、縦棒の他方の端部
は、上記係合部が上記係合受部に係合して保持され、ま
た、上記縦棒の一方の端部に、上記梯子部材を上記支持
軸部を中心に略垂直方向に回動したとき、上記係止凹部
に上記支持軸部が係止されるまで滑らせた状態でマンホ
ール開口部の支持軸部側周縁部に形成した受座に当接し
て上記梯子部材を起立状態に保持するストッパーと、上
記滑り部の根幹部側に揺動可能に吊り下げられ上記梯子
部材を起立状態にしたとき上記支持軸部に係止される係
止フックとを設け、また、上記梯子部材には、上記マン
ホール開口部の支持軸部側周縁部に形成された係止座に
対してその下面に当接してその上方への移動を規制し、
且つ上記係止座に当接して支持軸部側への移動を規制す
るロック体を係脱自在に設けたことを特徴とするマンホ
ール用の転落防止補助梯子。1. A ladder member comprising a pair of vertical rods having a length provided in an opening of a manhole and provided to face each other, and a horizontal bar provided between the vertical rods. A fall for a manhole which is attached to both ends of a rod between a pair of support shafts provided at one end of the opening and a pair of engagement receiving portions provided at the other end. An auxiliary ladder for prevention, comprising, at one end of the vertical bar, a sliding portion mounted on the support shaft portion and movable along the supporting shaft portion, and a locking concave portion continuous to a root side of the sliding portion. And
At the other end of the vertical bar, an engagement portion is provided opposite to the engagement receiving portion and is engaged with the engagement receiving portion to regulate movement in the vertical direction. When the ladder member is positioned substantially horizontally in the opening and the other end of the vertical bar is moved toward the engagement receiving portion, one end of the vertical bar supports the sliding portion. The other end of the vertical bar is held by the engagement portion engaged with the engagement receiving portion, and the other end of the vertical rod is held on the shaft portion and moved to the tip side. At one end of the vertical bar, when the ladder member is rotated in a substantially vertical direction around the support shaft, the manhole is slid until the support shaft is locked in the locking recess. A stopper that abuts against a seat formed at a peripheral portion of the opening on the side of the support shaft to hold the ladder member in an upright state; A locking hook that is suspended swingably and locked to the support shaft when the ladder member is in an upright state; and the ladder member has a periphery of the manhole opening on the support shaft side. Abutting against the lower surface of the locking seat formed in the portion to regulate upward movement thereof,
A fall prevention auxiliary ladder for a manhole, wherein a lock body that comes into contact with the locking seat and regulates movement to the support shaft side is detachably provided.
部側に樹立した壁面を有する凸部を形成し、上記ストッ
パーに上記壁面に略直角に当接する調節ボルトを設けた
ことを特徴とする請求項１記載のマンホール用の転落防
止補助梯子。2. The method according to claim 1, wherein a convex portion having a wall surface established at a center portion side of the stopper abutting position is formed on the receiving seat, and an adjusting bolt is provided on the stopper at a substantially right angle to the wall surface. The fall prevention auxiliary ladder for manholes according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000221652A JP2002038504A (en) | 2000-07-24 | 2000-07-24 | Fall-preventive auxiliary ladder for manhole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000221652A JP2002038504A (en) | 2000-07-24 | 2000-07-24 | Fall-preventive auxiliary ladder for manhole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002038504A true JP2002038504A (en) | 2002-02-06 |
Family
ID=18716018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000221652A Pending JP2002038504A (en) | 2000-07-24 | 2000-07-24 | Fall-preventive auxiliary ladder for manhole |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002038504A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006058380A1 (en) * | 2004-12-03 | 2006-06-08 | Bortana Pty Ltd | A ladderway system for underground raises |
| US9038775B2 (en) | 2010-01-13 | 2015-05-26 | Hiram (Wa) Pty Ltd | Ladderway system for underground raises |
| CN109081249A (en) * | 2018-10-14 | 2018-12-25 | 张家港市天运建筑机械有限公司 | A kind of vertical climbing auxiliary safety device for derrick crane |
-
2000
- 2000-07-24 JP JP2000221652A patent/JP2002038504A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006058380A1 (en) * | 2004-12-03 | 2006-06-08 | Bortana Pty Ltd | A ladderway system for underground raises |
| US8177028B2 (en) | 2004-12-03 | 2012-05-15 | Bortana Pty. Ltd. | Ladderway system for underground raises |
| US9038775B2 (en) | 2010-01-13 | 2015-05-26 | Hiram (Wa) Pty Ltd | Ladderway system for underground raises |
| CN109081249A (en) * | 2018-10-14 | 2018-12-25 | 张家港市天运建筑机械有限公司 | A kind of vertical climbing auxiliary safety device for derrick crane |
| CN109081249B (en) * | 2018-10-14 | 2024-01-19 | 张家港市天运建筑机械有限公司 | Vertical climbing auxiliary safety equipment for tower crane |
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