JP2012097522A

JP2012097522A - Fall prevention device for manhole

Info

Publication number: JP2012097522A
Application number: JP2010248035A
Authority: JP
Inventors: Tomio Kishida; 富夫岸田
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-11-05
Filing date: 2010-11-05
Publication date: 2012-05-24

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention device for a manhole which prevents the body and legs of a pedestrian from falling into a hole of a manhole when a manhole lid comes off due to a jet flowing from a vertical hole at flood and the hole cannot be seen.SOLUTION: The fall prevention device for the manhole comprises a net-like member 1-e installed directly under a manhole lid 7-e. Even when the manhole lid 7-e comes off due to a reverse jet flowing from sewerage 17 to a vertical hole 16 at flood, water jets from a net-like space, which prevents removal of the net-like member 1-e to block the hole of the manhole. Accordingly, the fall prevention device for the manhole prevents the body and legs of the pedestrian from falling into the hole of the manhole.

Description

この発明は洪水時のマンホールの転落防止装置に関するものである。 The present invention relates to a manhole fall prevention device during a flood.

従来の背景技術ではマンホールの蓋の真下に網状部材を取り付けたマンホールの転落防止装置は開示されていない。 The conventional background art does not disclose a manhole fall prevention device in which a net member is attached directly under the manhole cover.

都市部が豪雨で洪水になると地下の下水道に大量の水が流れマンホールの竪孔から水が逆流しマンホールの鉄蓋を押し上げ外れてしまい、マンホールの穴部が道路の洪水で見えなくなり、それによって、そこに人が歩くとマンホールの穴に足を踏み入れ転倒したり、体ごと入ってしまう危険性があるため、人の身体が入らないようにして危険を取り除くことを課題とした。 When an urban area is flooded by heavy rain, a large amount of water flows into the underground sewer and the water flows backward from the manhole's fistula and pushes off the manhole's iron cover. Because there is a risk that if a person walks into the hole of the manhole and falls or falls into the body, the task is to remove the danger by preventing the person from entering.

マンホールの円形の受け枠（８−ｅ）の中の段付き面（９）の下側の円形の内周面（１２−ｅ）に入る円形の網状部材（１−ｅ）とそれを付けた円形の取り付け用枠（３−ｅ）を図３、図４、図５のように設け、網状部材（１−ｅ）がマンホールの円形の蓋（７−ｅ）の真下に位置するように円形の取り付け用枠（３−ｅ）をマンホールの円形の受け枠（８−ｅ）の中の下側の円形の内周面（１２−ｅ）に取り付けたＵ形のフック（４）を使って図１、図１０、図１１のように取り付け、又、マンホールの四角形の受け枠（８−ｓ）の中の段付き面（９）の下側の四角形の内周面（１２−ｓ）に入る四角形の網状部材（１−ｓ）とそれを付けた四角形の取り付け用枠（３−ｓ）を図６、図７、図８のように設け、網状部材（１−ｓ）がマンホールの四角形の蓋（７−ｓ）の真下に位置するように四角形の取り付け用枠（３−ｓ）をマンホールの四角形の受け枠（８−ｓ）の中の下側の四角形の内周面（１２−ｓ）に取り付けたＵ形のフック（４）を使って、図２、図１１のように取り付けることを手段とした。これによって図１、図２から洪水時に下水道（１７）から大量の水が流れマンホールの竪孔（１６）から水が逆流、噴流してマンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）が外れても円形や四角形の受け枠（８−ｅ）（８−ｓ）の中の下側の円形や四角形の内周面（１２−ｅ）（１２−ｓ）の中に取り付けた円形や四角形の網状部材（１−ｅ）（１−ｓ）の網目の空間（１１−２）から水が通り噴流するため網状部材（１−ｅ）（１−ｓ）は外れないようになっているため歩行者が足をマンホールの穴に踏み入れ転倒したりマンホールの穴の中に体ごと入らないようになる。 A circular mesh member (1-e) that enters the circular inner peripheral surface (12-e) below the stepped surface (9) in the circular receiving frame (8-e) of the manhole and attached thereto A circular mounting frame (3-e) is provided as shown in FIGS. 3, 4, and 5 so that the mesh member (1-e) is positioned directly below the circular lid (7-e) of the manhole. Using a U-shaped hook (4) that attaches the mounting frame (3-e) to the lower circular inner peripheral surface (12-e) in the manhole circular receiving frame (8-e) 1, 10, and 11, and the rectangular inner peripheral surface (12-s) below the stepped surface (9) in the rectangular receiving frame (8-s) of the manhole. A quadrangular mesh member (1-s) and a square mounting frame (3-s) with the square mesh member (1-s) are provided as shown in FIGS. The rectangular mounting frame (3-s) is positioned directly below the rectangular lid (7-s) of the tool, and the inner periphery of the lower square in the rectangular receiving frame (8-s) of the manhole. Using a U-shaped hook (4) attached to the surface (12-s), the means was attached as shown in FIGS. 1 and 2, a large amount of water flows from the sewer (17) during the flooding, and the water flows backward and jets from the manhole (16), and the manhole circular or square lid (7-e) (7- Even if s) is removed, it is mounted in the lower circular or square inner peripheral surface (12-e) (12-s) in the circular or square receiving frame (8-e) (8-s). Since the water jets from the mesh space (11-2) of the circular or square mesh member (1-e) (1-s), the mesh member (1-e) (1-s) does not come off. As a result, pedestrians cannot step over or fall into manhole holes or enter their bodies.

マンホールの円形の受け枠（８−ｅ）の蓋（７−ｅ）のはめ込み部分の段つき面（９）の下側の円形の内周面（１２−ｅ）の中に入る円形の網状部材（１−ｅ）を図１、図３、図４、図５のように設け、又、マンホールの四角形の受け枠（８−ｓ）の四角形の蓋（７−ｓ）のはめ込み部分の段つき面（９）の下側の四角形の内周面（１２−ｓ）の中に入る四角形の網状部材（１−ｓ）を図２、図６、図７、図８のように設け、マンホールの円形や四角形の網状部材（１−ｅ）（１−ｓ）の網目の空間（１１−２）は安全上許される限り大きくしたほうが良く、網目の形はどのようなものでも良く、図３、図６のように鉄の帯板だけで円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）と枠（２）と網目の梁（１１）で組み付け溶接した円形や四角形の網状部材（１−ｅ）（１−ｓ）や図４、図５、図７、図８のように円形や四角形の枠（２）及び取り付け用枠（３−ｅ）（３−ｓ）の上にネットフェンス（１１−１）の網状部材（１−ｅ）（１−ｓ）を付けたものでも良いし、普通のフェンスの網状部材でも良い。歩道にマンホールがある場合はネットフェンスの網状部材、車道には鉄の帯板だけで組み付け溶接した頑丈な網状部材を取り付けたほうが良い。円形の網状部材（１−ｅ）を図１、図１０、図１１のようにマンホールの円形の蓋（７−ｅ）の真下に位置するようにマンホールの円形の受け枠（８−ｅ）の中の段つき面（９）の下側の円形の内周面（１２−ｅ）に取り付けるために、円形の網状部材（１−ｅ）の外周には図１、図３、図４、図５、のように板状の円形の取り付け用枠（３−ｅ）を設け、又、四角形の網状部材（１−ｓ）を図２、図１１のようにマンホールの四角形の蓋（７−ｓ）の真下に位置するようにマンホールの四角形の受け枠（８−ｓ）の中の段つき面（９）の下側の四角形の内周面（１２−ｓ）に取り付けるために、四角形の網状部材（１−ｓ）の外周には図２、図６、図７、図８のように板状の四角形の取り付け用枠（３−ｓ）を設けている。図１の（１）（２）、図２の（１）（２）の円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）は解りやすいように黒く塗りつぶしてある。 A circular mesh member that enters the circular inner peripheral surface (12-e) below the stepped surface (9) of the fitting portion of the lid (7-e) of the circular receiving frame (8-e) of the manhole. (1-e) is provided as shown in FIG. 1, FIG. 3, FIG. 4, and FIG. 5, and the step of the fitting portion of the rectangular lid (7-s) of the rectangular receiving frame (8-s) of the manhole is provided. A quadrangular mesh member (1-s) that falls within the quadrangular inner peripheral surface (12-s) on the lower side of the surface (9) is provided as shown in FIGS. 2, 6, 7, and 8, and The mesh space (11-2) of the circular or square mesh member (1-e) (1-s) should be made as large as possible for safety reasons, and any mesh shape may be used. As shown in FIG. 6, a circular or square mounting frame (3-e) (3-s), a frame (2) and a mesh beam (11) are assembled and welded using only an iron strip. Square mesh member (1-e) (1-s), circular or quadrangular frame (2) and mounting frame (3-e) (3-s) as shown in FIG. 4, FIG. 5, FIG. 7, FIG. ) On which the net member (1-e) (1-s) of the net fence (11-1) is attached, or a net member of an ordinary fence. If there is a manhole on the sidewalk, it is better to attach a net-like member of the net fence, and a sturdy net-like member that is assembled and welded only with an iron strip on the roadway. The circular mesh member (1-e) is positioned on the manhole circular receiving frame (8-e) so that the circular mesh member (1-e) is positioned directly below the manhole circular lid (7-e) as shown in FIGS. 1, 3, 4, and 4, the outer periphery of the circular mesh member (1-e) is attached to the lower circular inner peripheral surface (12-e) of the inner stepped surface (9). 5, a plate-like circular mounting frame (3-e) is provided, and a square mesh member (1-s) is formed as a manhole square lid (7-s) as shown in FIGS. ) To be attached to a rectangular inner peripheral surface (12-s) on the lower side of the stepped surface (9) in the rectangular receiving frame (8-s) of the manhole so as to be positioned directly below A plate-like square mounting frame (3-s) is provided on the outer periphery of the member (1-s) as shown in FIGS. The circular or square mounting frames (3-e) and (3-s) shown in (1) and (2) of FIG. 1 and (1) and (2) of FIG. 2 are painted black so that they can be easily understood.

マンホールの円形の受け枠（８−ｅ）でも四角形の受け枠（８−ｓ）でも、マンホールの蓋（７−ｅ）（７−ｓ）の下面と網状部材（１−ｅ）（１−ｓ）の上面との間隔距離を少なくして取り付けなければならない場合の取り付け用枠（３−ｅ）（３−ｓ）は図３の（３）、図５、図６の（３）、図８の網状部材（１−ｅ）（１−ｓ）の上面より下がった所で取り付け、図１１の（２）のように後述するＵ形のフック（４）の中に取り付け用枠（３−ｅ）（３−ｓ）が入り、その取り付け用枠（３−ｅ）（３−ｓ）の上に取り付け用ボルト（５）がある分だけ設計上、網状部材の上面より他の枠（２）の半分ぐらい下がった所に取り付け用枠（３−ｅ）（３−ｓ）を取り付けるようにしている。しかしながら、マンホールの蓋（７−ｅ）（７−ｓ）の下面と網状部材（１−ｅ）（１−ｓ）の上面との間隔距離を少なくする必要がない場合は図３の（２）や図４や図６の（２）や図７のように網状部材（１−ｅ）（１−ｓ）の上面と同じぐらいの高さで取り付け用枠（３−ｅ）（３−ｓ）を図１１の（１）のように取り付けている。よってマンホールの蓋の下面と網状部材の上面との間隔は大きくなっている。図１１の（１）（２）はこの発明を施した円形のマンホールの受け枠と四角形のマンホールの受け枠の側面からの断面図を併用している図であり、円形の網状部材（１−ｅ）と四角形の網状部材（１−ｓ）、円形の取り付け用枠（３−ｅ）と四角形の取り付け用枠（３−ｓ）、マンホールの円形の蓋（７−ｅ）とマンホールの四角形の蓋（７−ｓ）、円形の受け枠（８−ｅ）と四角形の受け枠（８−ｓ）、下側の円形の内周面（１２−ｅ）と下側の四角形の内周面（１２−ｓ）の矢印の符号は円形のｅと四角形のｓを併用していて、円形や四角形の側面からの断面図は同じような図になるために併用している。図１１の（１）は網状部材（１−ｅ）（１−ｓ）の上面と同じ高さの取り付け用枠（３−ｅ）（３−ｓ）をＵ形のフック（４）に取り付けた状態を示し、図１１の（２）は網状部材（１−ｅ）（１−ｓ）の上面より他の枠（２）の半分ぐらいに下げた取り付け用枠（３−ｅ）（３−ｓ）をＵ形のフック（４）に取り付けた状態を示している。図４は円形の取り付け用枠（３−ｅ）と枠（２）を併用して、図７は四角形の取り付け用枠（３−ｓ）と枠（２）を併用している。図５はネットフェンス（１１−１）を付けた円形の枠（２）の外周に網目の梁（１１）を８個取り付けてその梁（１１）より半分ぐらい下がった所で円形の取り付け用枠（３−ｅ）を取り付け、図８はネットフェンス（１１−１）を付けた四角形の枠（２）に網目の梁（１１）を右と左に２個ずつ取り付けて梁（１１）より下がった所で取り付け用の板を取り付けて枠（２）と取り付け用枠（３−ｓ）を併用している。 The lower surface of the manhole cover (7-e) (7-s) and the mesh member (1-e) (1-s), both of the manhole circular receiving frame (8-e) and the rectangular receiving frame (8-s). 3), the mounting frames (3-e) and (3-s) when the distance between the upper surface and the upper surface must be reduced are shown in FIGS. 3 (3), 5 and 6, (3), and FIG. Are attached below the upper surface of the mesh member (1-e) (1-s), and a mounting frame (3-e) is placed in a U-shaped hook (4) to be described later as shown in FIG. ) (3-s) enters and the frame (3-e) (3-s) has a mounting bolt (5) on it, so that the other frame (2) from the upper surface of the mesh member is designed. The attachment frame (3-e) (3-s) is attached to a place lowered about halfway. However, if it is not necessary to reduce the distance between the lower surface of the manhole cover (7-e) (7-s) and the upper surface of the mesh member (1-e) (1-s), (2) in FIG. As shown in FIGS. 4 and 6 (2) and 7, the mounting frame (3-e) (3-s) is as high as the upper surface of the mesh member (1-e) (1-s). Are attached as shown in FIG. 11 (1). Therefore, the distance between the lower surface of the manhole cover and the upper surface of the mesh member is large. (1) and (2) in FIG. 11 are views in which a circular manhole receiving frame according to the present invention is used in combination with a cross-sectional view from the side of the rectangular manhole receiving frame. e) and a square mesh member (1-s), a circular attachment frame (3-e) and a square attachment frame (3-s), a manhole circular lid (7-e) and a manhole square Lid (7-s), circular receiving frame (8-e) and rectangular receiving frame (8-s), lower circular inner peripheral surface (12-e) and lower rectangular inner peripheral surface ( The sign of the arrow 12-s) uses a circle e and a square s in combination, and the cross-sectional views from the sides of the circle and the rectangle are used together for the same view. In FIG. 11 (1), the attachment frame (3-e) (3-s) having the same height as the upper surface of the mesh member (1-e) (1-s) is attached to the U-shaped hook (4). FIG. 11 (2) shows a state of the attachment frame (3-e) (3-s) lowered from the upper surface of the mesh member (1-e) (1-s) to about half of the other frame (2). ) Is attached to the U-shaped hook (4). 4 uses a circular mounting frame (3-e) and the frame (2) together, and FIG. 7 uses a rectangular mounting frame (3-s) and the frame (2) together. FIG. 5 shows a circular mounting frame when eight mesh beams (11) are attached to the outer periphery of a circular frame (2) with a net fence (11-1) and lowered about half from the beam (11). (3-e) is attached, and FIG. 8 shows that two mesh beams (11) are attached to the quadrangular frame (2) with the net fence (11-1) attached to the right and left, respectively. The mounting plate is attached at the place where the frame (2) and the mounting frame (3-s) are used together.

ここからマンホールの円形や四角形の受け枠（８−ｅ）（８−ｓ）の網状部材（１−ｅ）（１−ｓ）の取り付けは同じ説明になるためマンホールで一番良く使われている円形の受け枠（８−ｅ）を使って説明すれば、図１のようにマンホールの円形の受け枠（８−ｅ）の中の段つき面（９）の下側の円形の内周面（１２−ｅ）に円形の網状部材（１−ｅ）を安定して支え取り付けられるように当分配列で４箇所にＵ形のフック（４）を設け、そのＵ形のフック（４）は鉄材の帯板をＵ型に曲げたものであるが、鋳造でも良く、その片側の取り付け側の板部（４−１）を段つき面（９）の下側の円形の内周面（１２−ｅ）に図１０、図１１のように溶接（１３）で取り付けている。段つき面（９）より下側に逆の段つき面（９−１）がある場合は図１０のように段付の内周面（１２−１）と下側の円形の内周面（１２−ｅ）の差幅分だけ下側の円形の内周面（１２−ｅ）とＵ形のフック（４）の取り付け側の板部（４−１）の間に四角柱のブロック（１０）をその板部（４−１）の両側に取り付けている。図１０のブロック（１０）は斜線で示している。そして４箇所のＵ形のフック（４）で図１２のようにＵ形の中に円形の網状部材（１−ｅ）の外周に設けた板状の円形の取り付け用枠（３−ｅ）を入れることにより円形の網状部材（１−ｅ）は円形の受け枠（８−ｅ）の中の段つき面（９）の下側の円形の円周面で支えられる。図１０の（１）（２）（３）と図１２は円形の網状部材（１−ｅ）の円形の取り付け用枠（３−ｅ）をＵ形のフック（４）で取り付けている状態を示しているが四角形の網状部材（１−ｓ）でも同じことであり図２のように四角形の受け枠（８−ｓ）にも同じようにＵ形のフック（４）で取り付けられようになっている。図１２の（１）と図１０の（３）はＵ形のフック（４）の中に円形の取り付け用枠（３−ｅ）が入るため曲面の分だけ両方の板部（４−１）（４−２）の間隔に余裕をもたせている。 From here, the attachment of the net-like member (1-e) (1-s) of the circular or quadrangular receiving frame (8-e) (8-s) of the manhole will be the same explanation, so it is most often used in manholes. If it demonstrates using a circular receiving frame (8-e), the circular inner peripheral surface of the lower side of the stepped surface (9) in the circular receiving frame (8-e) of the manhole as shown in FIG. (12-e) is provided with U-shaped hooks (4) at four locations for the time being so that the circular mesh member (1-e) can be stably supported and attached to the U-shaped hook (4). The belt plate is bent into a U shape, but may be cast. The plate portion (4-1) on one side of the belt plate is connected to the circular inner peripheral surface (12-) on the lower side of the stepped surface (9). e) is attached by welding (13) as shown in FIGS. When there is a reverse stepped surface (9-1) below the stepped surface (9), a stepped inner peripheral surface (12-1) and a lower circular inner peripheral surface ( A square pillar block (10) between the circular inner peripheral surface (12-e) on the lower side by the difference width of 12-e) and the plate portion (4-1) on the mounting side of the U-shaped hook (4). ) Are attached to both sides of the plate portion (4-1). The block (10) in FIG. 10 is indicated by hatching. Then, plate-shaped circular mounting frames (3-e) provided on the outer periphery of the circular mesh member (1-e) in the U-shape as shown in FIG. 12 with four U-shaped hooks (4). The circular mesh member (1-e) is supported by the circular circumferential surface below the stepped surface (9) in the circular receiving frame (8-e). 10 (1), (2), (3) and FIG. 12 show a state in which a circular attachment frame (3-e) of a circular mesh member (1-e) is attached by a U-shaped hook (4). As shown in FIG. 2, the same applies to the rectangular mesh member (1-s), and the U-shaped hook (4) can be attached to the rectangular receiving frame (8-s) as shown in FIG. ing. 12 (1) and FIG. 10 (3), since the circular mounting frame (3-e) is inserted into the U-shaped hook (4), both plate portions (4-1) are provided by the amount of the curved surface. A margin is provided for the interval (4-2).

図１のように４個のＵ形のフック（４）に支えられた円形の網状部材（１−ｅ）の円形の取り付け用枠（３−ｅ）の上方には図９の（１）ようにＵ形のフック（４）の片方の板部であるボルト側の板部（４−２）にボルト穴（５−１）を設け、円形の受け枠（８−ｅ）の中の下側の円形の内周面（１２−ｅ）に取り付ける取り付け側の板部（４−１）の上方にボルト穴（５−１）と同じ位置に当たる対称となるボルトネジ穴（５−２）を設け、ボルト穴（５−１）に取り付け用ボルト（５）を通して取り付け側の板部（４−１）のボルトネジ穴（４−２）にねじ込むことによって図９の（４）（５）（６）のようにＵ形のフック（４）に支えられた円形の網状部材（１−ｅ）の円形の取り付け用枠（３−ｅ）が上に動かないように取り付け用ボルト（５）の軸の非ネジ部（５−３）で止めている。Ｕ形のフック（４）の下側の底の部分には調整用のボルトネジ穴（６−１）を中央に１個設け下の方からナット（６−２）を嵌めた調整用ボルト（６）を入れ円形の網状部材（１−ｅ）の円形の取り付け用枠（３−ｅ）の下をボルトの先で上下させ調整することにより、調整が終わったら調整用ボルト（６）に嵌めてあるナット（６−２）をＵ形のフック（４）の底の部分の下側で締め付けて調整用ボルト（６）が動かないようにしている。 As shown in FIG. 9 (1), a circular mesh member (1-e) supported by four U-shaped hooks (4) as shown in FIG. A bolt hole (5-1) is provided in the bolt side plate (4-2) which is one plate of the U-shaped hook (4), and the lower side in the circular receiving frame (8-e) A symmetric bolt screw hole (5-2) that hits the same position as the bolt hole (5-1) is provided above the plate (4-1) on the attachment side to be attached to the circular inner peripheral surface (12-e) of 9 (4), (5), and (6) in FIG. 9 by screwing the bolt (5) for attachment into the bolt hole (4-2) of the plate (4-1) on the attachment side. For mounting the circular mesh member (1-e) supported by the U-shaped hook (4) so that the circular mounting frame (3-e) does not move upward Non-threaded portion of the shaft of the belt (5) has stopped in (5-3). An adjustment bolt (6) is provided with a bolt screw hole (6-1) for adjustment in the center on the lower bottom portion of the U-shaped hook (4) and a nut (6-2) is fitted from the bottom. ) And adjust the bottom of the circular attachment frame (3-e) of the circular mesh member (1-e) by moving it up and down with the tip of the bolt. A nut (6-2) is tightened under the bottom portion of the U-shaped hook (4) to prevent the adjustment bolt (6) from moving.

さらに、マンホールの円形の蓋（７−ｅ）の下面と円形の網状部材（１−ｅ）の上面との間隔距離、又は四角形の蓋（７−ｅ）の下面と四角形の網状部材（１−ｅ）の上面との間隔距離が網状部材（１−ｅ）（１−ｓ）の取り付け用枠（３−ｅ）（３−ｓ）の取り付け位置がマンホールの受け枠（８−ｅ）（８−ｓ）の中の下側の内周面（１２−ｅ）（１２−ｓ）に取り付けるＵ形のフック（４）の取り付けの上下位置によって違ってくることがあるためＵ形のフック（４）の取り付け用ボルト（５）で段階的に調整するために図９の（１）からＵ形のフック（４）の取り付け用ボルト（５）が入るボルト側の板部（４−２）のボルト穴（５−１）と取り付け側の板部（４−１）のボルトネジ穴（５−２）を段階的に図９の（２）のように一直線上に上から３個のボルト穴とボルトネジ穴を（５−１−ａ）と（５−２−ａ）、（５−１−ｂ）と（５−２−ｂ）、（５−１−ｃ）と（５−２−ｃ）を設け、図９の（３）は１個目の上のボルト穴（５−１−ａ）とボルトネジ穴（５−２−ａ）から斜め右下に２個目のボルト穴（５−１−ｂ）とボルトネジ穴（５−２−ｂ）、その穴から斜め左下に３個目のボルト穴（５−１−ｃ）とボルトネジ穴（５−２−ｃ）を設けている。図９の（２）より図９の（３）は段階的調整位置の距離が短くできる。それらの３箇所で取り付け用ボルト（５）の所定位置を図９の（４）（５）（６）のように見きわめてＵ形のフック（４）の下側にある調整用ボルト（６）で円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）の上下を調整して調整用ボルト（６）に嵌め込んだナット（６−２）をＵ形のフック（４）の底の下で締め調整用ボルト（６）を固定して、マンホールの円形や四角形の受け枠（８−ｅ）（８−ｓ）の中の下側の円形や四角形の内周面（１２−ｅ）（１２−ｓ）で円形や四角形の網状部材（１−ｅ）（１−ｓ）とそれらを付けた取り付け用枠（３−ｅ）（３−ｓ）をＵ形のフック（４）で支え取り付け、脱着可能にしたことを特徴とするマンホールの転落防止装置。 Further, the distance between the lower surface of the circular lid (7-e) of the manhole and the upper surface of the circular mesh member (1-e), or the lower surface of the square lid (7-e) and the rectangular mesh member (1- The distance between the upper surface of e) and the attachment frame (3-e) (3-s) of the mesh member (1-e) (1-s) is the manhole receiving frame (8-e) (8 -S), the U-shaped hook (4) may vary depending on the vertical position of the U-shaped hook (4) attached to the lower inner peripheral surface (12-e) (12-s). ) Of the bolt side plate portion (4-2) into which the mounting bolt (5) of the U-shaped hook (4) is inserted from (1) of FIG. The bolt hole (5-1) and the bolt screw hole (5-2) of the plate part (4-1) on the attachment side are stepped as shown in (2) of FIG. Three bolt holes and bolt screw holes from the top are formed on the line (5-1-a) and (5-2-a), (5-1-b), (5-2b), (5-1 c) and (5-2c) are provided, and (3) in FIG. 9 is diagonally lower right from the first upper bolt hole (5-1-a) and bolt screw hole (5-2-2-a). The second bolt hole (5-1-b) and the bolt screw hole (5-2b), and the third bolt hole (5-1-c) and the bolt screw hole (5-2) diagonally to the lower left from the hole -C). From (2) in FIG. 9, (3) in FIG. 9 can shorten the distance of the stepwise adjustment position. The adjustment bolts (6) at the lower side of the U-shaped hook (4) when the predetermined positions of the mounting bolts (5) are seen as shown in (4), (5) and (6) in FIG. Then, adjust the top and bottom of the circular or square mounting frame (3-e) (3-s) and insert the nut (6-2) fitted into the adjustment bolt (6) into the bottom of the U-shaped hook (4). The bolt (6) for tightening adjustment is fixed underneath, and the lower circular or square inner peripheral surface (12-e) in the circular or square receiving frame (8-e) (8-s) of the manhole. ) (12-s), a circular or quadrangular mesh member (1-e) (1-s) and a mounting frame (3-e) (3-s) with them attached to the U-shaped hook (4) A manhole fall-prevention device characterized in that it can be attached and removed in a supportive manner.

都市部の洪水の水は図１、図２から下水道（１７）に大量の水が流れ竪孔（１６）から逆流してマンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）を押し上げ噴流して道路へ溢れ出します。マンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）は外れマンホールの穴は開いたままになり歩行者にとって大変危険であります。この発明は図１、図２、図１０、図１１のようにマンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）の真下に円形や四角形の網状部材（１−ｅ）（１−ｓ）と枠（２）及び円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）をＵ形のフック（４）で取り付けることにより、洪水になった時、マンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）がなくなっても円形や四角形の網状部材（１−ｅ）（１−ｓ）があることにより歩行者がマンホールの穴に足を踏み入れて倒れたり、体ごと入らないようにします。円形や四角形の網状部材（１−ｅ）（１−ｓ）は溢れ出す水を網目の空間（１１−２）で通しマンホールの穴を塞いでいてくれています。又、下水の工事の時は網状部材（１−ｅ）（１−ｓ）の取り付け用枠（３−ｅ）（３−ｓ）を取り付けているＵ形のフック（４）の上側の取り付け用ボルト（５）を外し、網状部材（１−ｅ）（１−ｓ）を引き上げることで取り外し、網状部材（１−ｅ）（１−ｓ）を簡単に脱着可能にしており工事の作業に支障がないようにしております。 The flood water in the urban area flows from the water flow into the sewer (17) from Fig. 1 and Fig. 2, and then flows backward from the fist hole (16), so that the manhole's circular or square lid (7-e) (7-s) It pushes up and overflows into the road. The manhole's circular or square lid (7-e) (7-s) will come off, leaving the manhole hole open, which is very dangerous for pedestrians. In the present invention, as shown in FIGS. 1, 2, 10 and 11, a circular or quadrangular mesh member (1-e) (1) is formed directly under a circular or square lid (7-e) (7-s) of a manhole. -S), frame (2) and circular or square mounting frame (3-e) (3-s) are attached with U-shaped hooks (4), so that in the event of a flood, the manhole's circle or square Even if the lid (7-e) (7-s) is removed, the pedestrian falls into the manhole hole due to the circular or square mesh member (1-e) (1-s), Do not enter the whole body. Circular and square mesh members (1-e) and (1-s) allow the overflowing water to pass through the mesh space (11-2) and block the manhole holes. For sewage construction, for attaching the upper part of the U-shaped hook (4) to which the frame (3-e) (3-s) for attaching the mesh members (1-e) (1-s) is attached. Remove the bolt (5) and pull up the mesh member (1-e) (1-s) to remove it, making the mesh member (1-e) (1-s) easily removable, hindering construction work. I am trying not to have it.

この発明の円形の網状部材をマンホールの受け枠の中に取り付けた上面図と道路の受け枠の側面の断面図The top view which attached the circular net-like member of this invention in the receiving frame of a manhole, and sectional drawing of the side of the receiving frame of a road この発明の四角形の網状部材をマンホールの受け枠の中に取り付けた上面図と道路の受け枠の側面の断面図The top view which attached the square net-like member of this invention in the receiving frame of a manhole, and sectional drawing of the side of the receiving frame of a road 鉄の帯板を組み付け溶接した円形の網状部材の上面図と側面の断面図Top view and side cross-sectional view of a circular mesh-like member assembled and welded with an iron strip ネットフェンスを付けた円形の枠の上面図と側面の断面図Top view and side sectional view of a circular frame with a net fence マンホールの蓋に接近できるようにしたネットフェンスを付けた円形の枠と取り付け用枠の上面図と側面の断面図Top view and side cross-sectional view of a circular frame with a net fence and a mounting frame that allows access to the manhole cover 鉄の帯板を組み付け溶接した四角形の網状部材の上面図と側面の断面図Top view and side cross-sectional view of a quadrangular mesh-like member assembled and welded with an iron strip ネットフェンスを付けた四角形の取り付け用枠の上面図と側面の断面図Top view and side sectional view of a square mounting frame with a net fence マンホールの蓋に接近できるようにしたネットフェンスを付けた四角形の枠と取り付け用枠の上面図と側面の断面図Top view and side cross-sectional view of a rectangular frame with a net fence that allows access to the manhole cover and a mounting frame Ｕ形のフックとその取り付け用ボルトと調整用ボルトの取り付け状態を示す側面図と正面図Side view and front view showing the mounting state of the U-shaped hook, its mounting bolt and adjustment bolt マンホールの受け枠の下側の逆の段つき面のある内周面に取り付けたブロック付のＵ形のフックと網状部材の側面の断面図とＵ形のフックとブロックの取り付けを詳しく説明した側面図と裏面図と上面図Cross section of side face of U-shaped hook with hook and mesh member attached to inner peripheral surface with reverse stepped surface on lower side of manhole receiving frame and side face explaining in detail the mounting of U-shaped hook and block Figure, back view and top view マンホールの蓋の下面と網状部材の上面との差の間隔を調整する二つの取り付け用枠をＵ形のフックに取り付けた状態を示しマンホールの円形の受け枠に入る円形の網状部材の側面の断面図と四角形の受け枠に入る四角形の網状部材の側面の断面図を併用した図A cross-section of the side surface of a circular mesh member entering a circular receiving frame of a manhole, showing a state where two mounting frames for adjusting the difference between the lower surface of the manhole cover and the upper surface of the mesh member are attached to a U-shaped hook Figure combined with a cross-sectional view of the side of a quadrangular mesh member that fits into a quadrangular receiving frame マンホールの円形の受け枠の中の下側の内周面に取り付けたＵ形のフックと円形の網状部材の円形の取り付け用枠の状態を示す上面図と正面図と側面の断面図A top view, a front view, and a side sectional view showing a state of a circular mounting frame of a U-shaped hook and a circular mesh member attached to a lower inner peripheral surface of a circular receiving frame of a manhole.

円形や四角形のマンホールの蓋（７−ｅ）（７−ｓ）の真下に取り付ける円形や四角形の網状部材（１−ｅ）（１−ｓ）はマンホールの蓋（７−ｅ）（７−ｓ）の下面と円形や四角形の網状部材（１−ｅ）（１−ｓ）の上面との隙間は少ないように設計したほうが良い。円形や四角形の網状部材（１−ｅ）（１−ｓ）の材質は帯鉄や強化プラスチック、軽くて丈夫が最も好ましい。しかしながら、鉄で作るのなら鋳造より帯鉄で図３、図６のように枠（２）と網目の梁（１１）を組み付け溶接して作れば板状の円形や四角形の網状部材（１−ｅ）（１−ｓ）の取り付け用枠（３−ｅ）（３−ｓ）、枠（２）、網目の梁（１１）は薄くすることができ安価になる。もっと安くしたいならば図４、図５、図７、図８のように円形や四角形の帯鉄の枠（２）や取り付け用枠（３−ｅ）（３−ｓ）の上にネットフェンス（１１−１）や普通のフェンスを付ける方法が良い。しかしながら、ネットフェンス（１１−１）や普通のフェンスの網状部材の場合は歩道のマンホールには向くが車道のマンホールではやはり頑丈な帯鉄で組み付け溶接した網状部材が良い。円形や四角形の網状部材（１−ｅ）（１−ｓ）の網目の空間（１１−２）部分は安全上許される限り大きくしたほうが良い。特に図４、図７のようにネットフェンス（１１−１）や普通のフェンスを付ける場合は網状部材の取り付け用枠（３−ｅ）（３−ｓ）を取り付けるＵ形のフック（４）の取り付け用ボルト（５）を取り付けたり外したりする時にＵ形のフック（４）の取り付け場所の網目の空間（１１−２）は手が入るように大きくしなければならない。円形や四角形の帯板の組み付け溶接やプラスチック成型の網状部材（１−ｅ）（１−ｓ）の網目の梁（１１）や枠（２）の下側は図１の（２）、図２の（２）、図３の（２）（３）、図６の（２）（３）、図１０の（１）、図１１の（１）（２）の側面の断面図ように洪水時に噴流する水の抵抗を少なくするために先細り（１４）にしたほうが良い。マンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）の下面と円形や四角形の網状部材（１−ｅ）（１−ｓ）の上面との間隔距離は図１０の（１）（２）のようにＵ形のフック（４）に取り付けられた円形や四角形の網状部材（１−ｅ）（１−ｓ）の取り付け用枠（３−ｅ）（３−ｓ）の上側に取り付け用ボルト（５）があるため、そのボルト（５）の箇所の部分だけ図３の（３）、図５の（２）、図６の（３）、図８の（２）のように網状部材（１−ｅ）（１−ｓ）の上面より他の枠（２）の半分ぐらい下がったところで取り付けることにより、マンホールの蓋（７−ｅ）（７−ｓ）の下面に網状部材（１−ｅ）（１−ｓ）の上面が接近できるようになる。 The circular or square mesh member (1-e) (1-s) to be attached directly under the circular or square manhole cover (7-e) (7-s) is the manhole cover (7-e) (7-s). ) And the upper surface of the circular or square mesh member (1-e) (1-s) should be designed to be small. The material of the circular or quadrangular mesh member (1-e) (1-s) is most preferably a band or reinforced plastic, light and strong. However, if it is made of iron, if it is made by assembling and welding the frame (2) and the mesh beam (11) as shown in FIGS. e) The mounting frame (3-e) (3-s), the frame (2), and the mesh beam (11) of (1-s) can be made thin and inexpensive. If you want to make it cheaper, as shown in FIGS. 4, 5, 7, and 8, the net fence (2) on the circular or quadrilateral band iron or on the mounting frame (3-e) (3-s) 11-1) or a method of attaching an ordinary fence is preferable. However, in the case of a net fence (11-1) or a regular fence net-like member, a net-like member that is suitable for a manhole on a sidewalk but is also assembled and welded with a sturdy band iron is preferable for a manhole on a roadway. The space (11-2) portion of the mesh of the circular or quadrangular mesh members (1-e) (1-s) should be as large as possible for safety reasons. In particular, when attaching a net fence (11-1) or a normal fence as shown in FIGS. 4 and 7, the U-shaped hook (4) for attaching the attachment frame (3-e) (3-s) for the mesh member is used. When the mounting bolt (5) is attached or removed, the mesh space (11-2) where the U-shaped hook (4) is attached must be enlarged so that a hand can be inserted. The lower side of the mesh beam (11) and the frame (2) of the net-like member (1-e) (1-s) of the assembly welding of a circular or square band plate or plastic molding is shown in (2) and FIG. (2), (2) and (3) in FIG. 3, (2) and (3) in FIG. 6, (1) in FIG. 10, and (1) and (2) in FIG. It is better to taper (14) in order to reduce the resistance of the jet water. The distance between the lower surface of the manhole circular or quadrangular lid (7-e) (7-s) and the upper surface of the circular or quadrangular mesh member (1-e) (1-s) is shown in (1) ( Mounted on the upper side of the mounting frame (3-e) (3-s) of the circular or square mesh member (1-e) (1-s) attached to the U-shaped hook (4) as in 2) Since there is a bolt (5), only the portion of the bolt (5) is meshed as shown in (3) in FIG. 3, (2) in FIG. 5, (3) in FIG. 6, and (2) in FIG. The net-like member (1) is attached to the lower surface of the manhole cover (7-e) (7-s) by attaching the member (1-e) (1-s) when it is lowered about half of the other frame (2) from the upper surface. -E) The upper surface of (1-s) becomes accessible.

Ｕ形のフック（４）は図９のように鉄製の帯板をＵ形に曲げて作るが、鉄の鋳造品でも良い。Ｕ形に曲げた帯板の両方の板部の取り付け側の板部（４−１）とボルト側の板部（４−２）の間隔は前述した円形や四角形の網状部材（１−ｅ）（１−ｓ）の取り付け用枠（３−ｅ）（３−ｓ）が図９の（４）（５）（６）のように余裕もって入るぐらいが良い。Ｕ形のフック（４）のＵ形の中に円形の取り付け用枠（３−ｅ）が入る場合は曲面の分だけ図１２の（１）と図１０の（３）の両方の板部（４−１）（４−２）は間隔に余裕をもたせなければならない。マンホールの円形や四角形の受け枠（８−ｅ）（８−ｓ）の種類によって受け枠の中の段つき面（９）の下側の円形や四角形の内周面（１２−ｅ）（１２−ｓ）は図１０の（１）（２）のように途中、少し下がったところで段つき面（９）の下側に逆の段つき面（９−１）があり下側の内周の内径が大きくなっている受け枠（８）があるため、段つきの内周面（１２−１）と下側の内周面（１２−ｅ）（１２−ｓ）の差幅分だけ、受け枠（８−ｅ）（８−ｓ）の中の下側の内周面（１２−ｅ）（１２−ｓ）へのＵ形のフック（４）の取り付けは取り付け側の板部（４−１）の裏側にブロック（１０）を設けて円形や四角形の網状部材（１−ｅ）（１−ｓ）の取り付け用枠（３−ｅ）（３−ｓ）が入りやすいようにしてＵ形のフック（４）の取り付け側の板部（４−１）の裏の両側に縦にして四角柱のブロック（１０）を二つ取り付けるのが良い。図１０の（１）（２）（３）ではブロック（１０）を斜線で示している。 The U-shaped hook (4) is made by bending an iron strip into a U shape as shown in FIG. 9, but may be a cast iron product. The distance between the plate portion (4-1) on the attachment side and the plate portion (4-2) on the bolt side of both plate portions of the U-shaped band plate is the above-described circular or square mesh member (1-e). It is better that the mounting frame (3-e) (3-s) of (1-s) enters with sufficient margin as shown in (4), (5) and (6) of FIG. When the circular mounting frame (3-e) is inserted into the U-shape of the U-shaped hook (4), both the plate portions (1) in FIG. 12 and (3) in FIG. In 4-1) and (4-2), an interval must be provided. Depending on the type of circular or square receiving frame (8-e) (8-s) of the manhole, the circular or rectangular inner peripheral surface (12-e) (12) below the stepped surface (9) in the receiving frame -S), as shown in (1) and (2) of FIG. 10, there is a reverse stepped surface (9-1) on the lower side of the stepped surface (9) when it is slightly lowered. Since there is a receiving frame (8) having a larger inner diameter, the receiving frame is only the difference width between the stepped inner peripheral surface (12-1) and the lower inner peripheral surface (12-e) (12-s). The attachment of the U-shaped hook (4) to the lower inner peripheral surface (12-e) (12-s) in (8-e) (8-s) ) With a block (10) on the back side so that the mounting frame (3-e) (3-s) of the circular or square mesh member (1-e) (1-s) can be easily inserted. Hook (4) removal With side plate portion (4-1) had better attach two a square pillar blocks (10) in the vertically opposite sides of the back of the. In FIG. 10, (1), (2), and (3), the block (10) is indicated by hatching.

Ｕ形のフック（４）が鉄製なら道路に取り付けられているマンホールの鉄製の受け枠（８−ｅ）（８−ｓ）の中の下側の内周面（１２−ｅ）（１２−ｓ）に図１０、図１１のようにＵ形のフック（４）を取り付ける作業では溶接ができるため作業コストが安価で済む。ボルト付けでも良いが受け枠（８−ｅ）（８−ｓ）の中の下側の内周面（１２−ｅ）（１２−ｓ）にボルトネジ穴を加工しなければならないため道路の現場では時間がかかり作業コストがかかり高価になる。又、材質が違う鋳物製のマンホールの受け枠のＵ形のフック（４）の取り付けはボルト付けしなければならない。 If the U-shaped hook (4) is made of iron, the lower inner peripheral surface (12-e) (12-s) in the iron receiving frame (8-e) (8-s) of the manhole attached to the road 10 and FIG. 11, the work for attaching the U-shaped hook (4) can be welded, so that the work cost is low. Although it may be bolted, the bolt screw hole must be machined on the lower inner peripheral surface (12-e) (12-s) in the receiving frame (8-e) (8-s). Time-consuming and costly and expensive. In addition, the U-shaped hook (4) of the receiving frame of the cast manhole made of different materials must be bolted.

この発明の実施例を説明すれば、円形や四角形の網状部材（１−ｅ）（１−ｓ）と網状部材（１−ｅ）（１−ｓ）を付ける枠（２）や円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）とＵ形のフック（４）を製作することでこの発明が成り立つ。円形や四角形の網状部材（１−ｅ）（１−ｓ）を作るには帯鉄で組み付け溶接して作れば丈夫で板状の網状部材（１−ｅ）（１−ｓ）の取り付け用枠（３−ｅ）（３−ｓ）、枠（２）、網目の梁（１１）を薄くすることができ安価になり、プラスチックの場合は金型によって作るが金型は高いが円形や四角形の網状部材（１−ｅ）（１−ｓ）を大量に作れば安価になる。又、円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）や枠（２）の上にネットフェンス（１１−１）や普通のフェンスを取り付けることでさらに安価になる。円形や四角形の網状部材（１−ｅ）（１−ｓ）を帯鉄で組み付け溶接して作る時も、プラスチックで金型によって作る時も網状部材（１−ｅ）（１−ｓ）と共に取り付け用枠（３−ｅ）（３−ｓ）も同時に作る。網状部材の取り付け用枠（３−ｅ）（３−ｓ）の位置はマンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）の下面と円形や四角形の網状部材（１−ｅ）（１−ｓ）の上面の間隔の距離を少なくしたい場合は図１の（２）、図２の（２）、図３の（３）、図５の（２）、図６の（３）、図８の（２）のようにそれらの網状部材（１−ｅ）（１−ｓ）の上面より他の枠（２）の半分ぐらい下側に取り付ける。 Describing an embodiment of the present invention, a frame (2) for attaching a circular or square mesh member (1-e) (1-s) and a mesh member (1-e) (1-s) or a circle or square shape. The present invention is realized by manufacturing the mounting frame (3-e) (3-s) and the U-shaped hook (4). A round or quadrangular mesh member (1-e) (1-s) can be made by assembling and welding with a band iron, and it is a strong and frame for attaching plate-like mesh members (1-e) (1-s). (3-e) (3-s), frame (2), mesh beam (11) can be made thin and inexpensive, and in the case of plastic, it is made of a mold, but the mold is expensive but circular or square. If a large amount of reticulated members (1-e) (1-s) is made, the cost becomes low. Moreover, it becomes further inexpensive by attaching a net fence (11-1) or a normal fence on the circular or square attachment frames (3-e) (3-s) or the frame (2). Attached with the mesh members (1-e) (1-s) both when the round and square mesh members (1-e) (1-s) are assembled and welded with band iron and when they are made with plastic molds. The frame (3-e) (3-s) is also made at the same time. The positions of the attachment frames (3-e) and (3-s) for the mesh member are the lower surface of the circular or square lid (7-e) (7-s) of the manhole and the circular or square mesh member (1-e). When it is desired to reduce the distance between the top surfaces of (1-s), (2) in FIG. 1, (2) in FIG. 2, (3) in FIG. 3, (2) in FIG. 5, (3) in FIG. As shown in FIG. 8 (2), the mesh members (1-e) and (1-s) are attached to the lower side of the other frame (2) by about half from the upper surface.

Ｕ形のフック（４）を製作するには図９ように鉄製の帯板を円形や四角形の網状部材（１−ｅ）（１−ｓ）の外周にある取り付け用枠（３−ｅ）（３−ｓ）の板が余裕をもって入るくらいにＵ形に曲げて作るが鉄の鋳造でも良い。鉄の鋳造は高価になる。Ｕ形のフック（４）の両方の板部の上部にはボルト穴とボルトネジ穴に入る取り付け用ボルト（５）の位置を段階的に調整できるように片方の板の上部のボルト側板部（４−２）には３個の取り付け用のボルト穴（５−１）を間隔をあけて加工しボルト穴（５−１）と同数で同じ位置になるように反対側の取り付け側板部（４−１）にボルトネジ穴（５−２）を３個加工するが、ボルト穴とボルトネジ穴に入る取り付け用ボルト（５）は図９の（２）のように中央に一直線上に間隔をおいて３個のボルト穴と３個のボルトネジ穴を加工するか、図９の（３）のように一個目の穴（５−１−ａ）（５−２−ａ）は真ん中に二個目（５−１−ｂ）（５−２−ｂ）は間隔をあけて斜め右下に三個目（５−１−ｃ）（５−２−ｃ）は斜め左下に間隔をあけてボルト穴とボルトネジ穴を加工をすることにより一直線上にボルト穴とボルトネジ穴を加工するより階的調整位置の距離が短くなる。それぞれのボルト穴とボルト穴の間隔は５ミリから１０ミリぐらいが望ましい。図９の（２）（３）（４）（５）（６）のようにそれらの加工した三個のボルト穴（５−１−ａ）（５−１−ｂ）（５−１−ｃ）と同じ位置にある対象となる反対の板部になる後述するマンホールの受け枠（８）の中の下側の内周面（１２）に取り付ける取り付け側の板部（４−１）に３個のボルトネジ穴（５−２−ａ）（５−２−ｂ）（５−２−ｃ）を加工する。Ｕ形のフック（４）の下にある底には中央にボルトネジ穴（６−１）を１個加工する。これらの穴加工したＵ形のフック（４）をマンホールの受け枠（８）１個に対して図１、図２では４個取り付けるが、受け枠（８）の大きさによっては６個以上必要とすることもある。受け枠の種類によって図１０の（１）（２）のようにマンホールの蓋（７−ｅ）（７−ｓ）が入る段つき面（９）の下側に逆の段つき面（９−１）がある下側の内周面（１２−ｅ）（１２−ｓ）にＵ形のフック（４）を取り付けるにはそのフック（４）の取り付け側の板部（４−１）の裏の両端に縦方向に四角柱のブロック（１０）を溶接で取り付けるが、Ｕ形のフック（４）を鋳造で作る場合にはブロック（１０）ごと一体化して鋳造する。ブロック（１０）の大きさは段つきの内周面（１２−１）と下側の内周面（１２）の差幅ぐらいで良い。図１０ではブロック（１０）を斜線で示している。これでこの発明が必要とする部品の加工は終わる。 In order to manufacture the U-shaped hook (4), as shown in FIG. 9, an iron strip is attached to a mounting frame (3-e) (3-e) on the outer periphery of a circular or square mesh member (1-e) (1-s). It is made by bending it into a U shape so that the 3-s) plate can be inserted with sufficient margin, but iron casting may be used. Iron casting is expensive. On the upper part of both plate parts of the U-shaped hook (4), the bolt side plate part (4 on the upper part of one plate so that the position of the bolt and the mounting bolt (5) entering the bolt screw hole can be adjusted stepwise. -2), three mounting bolt holes (5-1) are machined at intervals, and the opposite mounting side plate portion (4- Three bolt screw holes (5-2) are machined in 1). The bolts and the mounting bolts (5) that fit into the bolt screw holes are arranged in a straight line at the center as shown in FIG. 9 (2). Machine one bolt hole and three bolt screw holes, or as shown in FIG. 9 (3), the first hole (5-1-a) (5-2-2-a) is the second (5 -1-b) (5-2b) is spaced diagonally to the lower right and the third (5-1-c) (5-2c) is spaced diagonally to the lower left. Only the distance Kaiteki adjustment positions than machining a bolt hole and the bolt threads holes in a straight line by the processing bolt holes and bolt threads holes becomes shorter. The distance between each bolt hole is preferably about 5 mm to 10 mm. The three bolt holes (5-1-a) (5-1-b) (5-1-c) processed as shown in (2), (3), (4), (5), and (6) of FIG. 3) on the attachment-side plate portion (4-1) to be attached to the lower inner peripheral surface (12) in the manhole receiving frame (8) to be described later, which becomes the opposite plate portion to be the target at the same position as The bolt screw holes (5-2a), (5-2b), and (5-2c) are processed. One bolt screw hole (6-1) is machined in the center on the bottom under the U-shaped hook (4). In FIG. 1 and FIG. 2, four of these U-shaped hooks (4) with holes drilled are attached to one manhole receiving frame (8). However, depending on the size of the receiving frame (8), six or more are required. Sometimes. Depending on the type of the receiving frame, as shown in FIGS. 10 (1) and 10 (2), a reverse stepped surface (9−) is formed below the stepped surface (9) into which the manhole cover (7-e) (7-s) enters. 1) To attach the U-shaped hook (4) to the lower inner peripheral surface (12-e) (12-s), the back of the plate (4-1) on the mounting side of the hook (4) A rectangular column block (10) is attached to both ends of the steel plate by welding, but when the U-shaped hook (4) is made by casting, the block (10) is integrally cast. The size of the block (10) may be about the difference between the stepped inner peripheral surface (12-1) and the lower inner peripheral surface (12). In FIG. 10, the block (10) is indicated by hatching. This completes the processing of the parts required by the present invention.

次に道路のマンホールの工事においてこの発明の円形や四角形の網状部材（１−ｅ）（１−ｓ）を付けた取り付け用枠（３−ｅ）（３−ｓ）とＵ形のフック（４）の取り付け作業を一番多く使われている円形のマンホールの受け枠（８−ｅ）において説明すれば、道路面に埋め込まれている円形の受け枠（８−ｅ）のマンホール円形の蓋（７−ｅ）の真下に円形の網状部材（１−ｅ）を図１のように取り付けられるように、円形の受け枠（８−ｅ）の下側の円形の内周面（１２−ｅ）に当分配列で４個のＵ形のフック（４）の取り付け側の板部（４−１）の縦方向の両端を図１０、図１１、図１２のように溶接で取り付ける。図１０の（１）（２）のように受け枠（８−ｅ）の中の段つき面（９）の下側に逆の段つき面（９−１）がある場合は前記ブロック（１０）付きのＵ形のフック（４）を必要とし、取り付け側の板部（４−１）の裏の両端にある２個の四角柱のブロック（１０）の縦方向の外側の端を円形の受け枠（８−ｅ）の中の下側の円形の内周面（１２−ｅ）に当分配列でブロック（１０）付きのＵ形のフック（４）を４個溶接で取り付ける。 Next, in the construction of the manhole on the road, the mounting frame (3-e) (3-s) and the U-shaped hook (4) with the circular or square mesh members (1-e) (1-s) according to the present invention. ) In the circular manhole receiving frame (8-e), which is used most frequently, the circular manhole cover (8-e) embedded in the road surface ( The circular inner peripheral surface (12-e) on the lower side of the circular receiving frame (8-e) so that the circular mesh member (1-e) can be attached just below 7-e) as shown in FIG. Next, the vertical ends of the plate portion (4-1) on the mounting side of the four U-shaped hooks (4) are attached by welding as shown in FIG. 10, FIG. 11 and FIG. As shown in FIGS. 10 (1) and 10 (2), when there is an opposite stepped surface (9-1) below the stepped surface (9) in the receiving frame (8-e), the block (10 ) With a U-shaped hook (4) and a circular outer end in the vertical direction of the two square pillar blocks (10) at both ends of the back side of the plate (4-1) on the attachment side. Four U-shaped hooks (4) with blocks (10) are attached by welding to the lower circular inner peripheral surface (12-e) in the receiving frame (8-e) for the time being.

次に等分配列された溶接で取り付けた４個のＵ形のフック（４）に図９の（１）のようにフック（４）の底にある調整用のボルトネジ穴（６−１）にナット（６−２）を嵌めた調整用ボルト（６）を下側からある程度入れる。次に円形の受け枠（８−ｅ）の上から円形の網状部材（１−ｅ）を入れ、その網状部材（１−ｅ）の円形の取り付け用枠（３−ｅ）を４個のＵ形のフック（４）の中に入れ底に着くまで入れる。次に４個のＵ形のフック（４）の底の調整用のボルトネジ穴（６−１）に入れた調整用ボルト（６）で円形の網状部材（１−ｅ）の上面を平行に上げていき、この時に、マンホールの円形の蓋（７−ｅ）がないため事前にマンホールの蓋（７−ｅ）を閉めた状態の下面の位置を測って置き、マンホールの円形の蓋（７−ｅ）の予測した下面に接近すると思われる位置まで少し余裕を持って調整用ボルト（６）をねじ込んでいき、図９の（２）（３）からＵ形のフック（４）のボルト側の板部（４−２）にある３個のボルト穴（５−１−ａ）（５−１−ｂ）（５−１−ｃ）の中で図９の（４）（５）（６）のように円形の網状部材（１−ｅ）の円形の取り付け用枠（３−ｅ）の上の近いボルト穴に取り付け用ボルト（５）を差し込んでそのボルト穴と同じ位置にある反対側の板部のボルトネジ穴（５−２）にボルト（５）のネジ部を入れ、固定できるまでねじ込んでいく。次に４個のＵ形のフック（４）の下側の底の中央にあるボルトネジ穴（６−１）にある調整用ボルト（６）でＵ形のフック（４）の中にある円形の網状部材（１−ｅ）の円形の取り付け用枠（３−ｅ）を上側にある取り付け用ボルト（５）の軸の非ネジ部（５−３）に着くまでねじ込んでいき調整用ボルト（６）に嵌め込んだナット（６−２）をＵ形のフック（４）の底の下で締め、調整用ボルト（６）を固定して円形の網状部材（１−ｅ）の取り付けが終わる。円形の網状部材（１−ｅ）の取り付けが終わったらマンホールの円形の蓋（６−ｅ）を閉めて作業は終わる。 Next, to the four U-shaped hooks (4) attached by welding arranged in equal parts, bolt bolt holes (6-1) for adjustment at the bottom of the hook (4) as shown in (1) of FIG. Insert the adjusting bolt (6) fitted with the nut (6-2) to some extent from below. Next, a circular mesh member (1-e) is put on the circular receiving frame (8-e), and the circular mounting frame (3-e) of the mesh member (1-e) is inserted into four Us. Put in the shape hook (4) until it reaches the bottom. Next, the upper surface of the circular mesh member (1-e) is raised in parallel with the adjusting bolt (6) inserted into the adjusting bolt screw hole (6-1) at the bottom of the four U-shaped hooks (4). At this time, since there is no circular manhole cover (7-e), the position of the lower surface of the manhole cover (7-e) is previously measured and placed, and the circular manhole cover (7-e) is placed. e) Screw in the adjustment bolt (6) with a little margin until it seems to approach the predicted lower surface of e), and from (2) (3) in Fig. 9 to the bolt side of the U-shaped hook (4) Among the three bolt holes (5-1-a) (5-1-b) (5-1-c) in the plate portion (4-2), (4), (5) and (6) in FIG. Insert the mounting bolt (5) into the near bolt hole on the circular mounting frame (3-e) of the circular mesh member (1-e) as shown in FIG. Put the threaded portion of the bolt (5) to the bolt threads holes on the opposite side of the plate portion at the same position as the hole (5-2), it is screwed to be fixed. The four U-shaped hooks (4) next to the circular bolts in the U-shaped hooks (4) with the adjusting bolts (6) in the bolt screw holes (6-1) in the middle of the bottom of the bottom. The circular mounting frame (3-e) of the mesh member (1-e) is screwed in until it reaches the non-threaded portion (5-3) of the shaft of the mounting bolt (5) on the upper side (6) ) And the nut (6-2) fitted to the bottom of the U-shaped hook (4) is tightened, and the adjustment bolt (6) is fixed to complete the attachment of the circular mesh member (1-e). When the circular mesh member (1-e) has been attached, the manhole's circular lid (6-e) is closed to complete the operation.

この発明のマンホールの円形や四角形の受け枠（８−ｅ）（８−ｓ）を道路に設置が完了したとして図１、図２を使って説明すれば、仮に豪雨になると道路は洪水になって地下の下水道（１７）には大量に水が流れ下水道の竪孔（１６）を通って噴水のようにマンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）を押し上げて水が溢れ出す。この時にはマンホールの蓋（７−ｅ）（７−ｓ）は外れているか、どこかに行ってしまっているが円形や四角形の網状部材（１−ｅ）（１−ｓ）がマンホールの受け枠（８−ｅ）（８−ｓ）の中の下側に取り付けられているため網状部材（１−ｅ）（１−ｓ）の網目の空間（１１−２）から水が溢れ出しても道路の洪水でマンホールの穴が見えなくなっていても、歩行者がマンホールに足を踏み入れて転倒したり、体ごとマンホールに入ったりすることはなくなるマンホールの転落防止装置である。 Assuming that the circular or quadrangular receiving frame (8-e) (8-s) of the manhole according to the present invention has been installed on the road, it will be described with reference to FIG. 1 and FIG. Then, a large amount of water flows into the sewer (17) in the basement and pushes the circular or square lid (7-e) (7-s) of the manhole like a fountain through the sewer hole (16). Overflowing. At this time, the lid (7-e) (7-s) of the manhole is removed or has gone somewhere, but the circular or quadrangular mesh member (1-e) (1-s) is the manhole receiving frame. (8-e) Since it is attached to the lower side of (8-s), even if water overflows from the mesh space (11-2) of the mesh members (1-e) (1-s), the road This is a manhole fall prevention device that prevents a pedestrian from stepping into the manhole and falling into the manhole with the body even when the hole in the manhole is not visible due to floods.

マンホールの多い都市部では豪雨の時、道路が洪水になったりする時がありますが、雨が止んでも道路の水はなかなか引いていきませんし道路面（１８）から水が２０センチぐらいあっても水の濁りによってマンホールの穴は見えません。雨が止んだ時は歩行者が多くなりマンホールの事故の危険性がでてきます。この発明はマンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）が外れたり無くなった時にマンホールの穴に歩行者が足を踏み入れて転倒したり、体ごと入ったりしないように危険を取り除く発明であり、この発明を産業上に利用するために図１、図２、図１０、図１１のようにマンホールの受け枠（８）の中の下側の内周の中に円形や四角形の網状部材（１−ｅ）（１−ｓ）を設け、その網状部材（１−ｅ）（１−ｓ）を付けた円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）をＵ形のフック（４）に取り付けることによって制作費が安価で短い時間で網状部材（１−ｅ）（１−ｓ）を脱着可能に取り付けられるようにした産業上の利用可能性のあるマンホールの転落防止装置の発明であります。 In urban areas with many manholes, there are times when the roads become flooded during heavy rains, but even if the rain stops, the water on the roads cannot be drawn easily. The hole in the manhole cannot be seen due to cloudiness. When the rain stops, there will be more pedestrians and there will be a danger of manhole accidents. This invention is dangerous to prevent the pedestrian from stepping into the hole in the manhole and falling into the body when the circular or square lid (7-e) (7-s) of the manhole is removed or lost. In order to use the present invention industrially, as shown in FIGS. 1, 2, 10, and 11, a circular shape or a rectangular shape is formed in the lower inner periphery of the manhole receiving frame (8). And a circular or square mounting frame (3-e) (3-s) with the mesh members (1-e) (1-s). A manhole with industrial applicability that can be attached to the U-shaped hook (4) so that the mesh member (1-e) (1-s) can be attached and detached in a short time with a low production cost. It is an invention of a fall prevention device.

１−ｅ円形の網状部材
１−ｓ四角形の網状部材
２枠
３−ｅ円形の取り付け用枠
３−ｓ四角形の取り付け用枠
４Ｕ形のフック
４−１取り付け側の板部
４−２ボルト側の板部
５取り付け用ボルト
５−１ボルト穴
５−１−ａ１個目のボルト穴
５−１−ｂ２個目のボルト穴
５−１−ｃ３個目のボルト穴
５−２ボルトネジ穴
５−２−ａ１個目のボルトネジ穴
５−２−ｂ２個目のボルトネジ穴
５−２−ｃ３個目のボルトネジ穴
５−３ボルトの軸の非ネジ部
６調整用ボルト
６−１ボルトネジ穴
６−２ナット
７−ｅマンホールの円形の蓋
７−ｓマンホールの四角形の蓋
８−ｅ円形の受け枠
８−ｓ四角形の受け枠
９段つき面
９−１下側の逆の段つき面
１０ブロック
１１網目の梁
１１−１ネットフェンス
１１−２網目の空間
１２−ｅ下側の円形の内周面
１２−ｓ下側の四角形の内周面
１２−１段つきの内周面
１３溶接
１４先細り
１５受け枠の梁
１６竪孔
１７下水道
１８道路面
１９アスファルト
２０土砂 1-e circular mesh member 1-s square mesh member 2 frame 3-e circular mounting frame 3-s square mounting frame 4 U-shaped hook 4-1 mounting side plate portion 4-2 bolt side Plate part 5 mounting bolt 5-1 bolt hole 5-1-a first bolt hole 5-1-b second bolt hole 5-1-c third bolt hole 5-2 bolt screw hole 5-2a First bolt screw hole 5-2b Second bolt screw hole 5-2c Third bolt screw hole 5-3 Non-screw part 6 of bolt shaft 6 Adjustment bolt 6-1 Bolt screw hole 6-2 Nut 7-e Manhole circular lid 7-s Manhole square lid 8-e Circular receiving frame 8-s Square receiving frame 9 Stepped surface 9-1 Reverse step on the lower side Surface 10 Block 11 Mesh beam 11-1 Net fence 11-2 Mesh space 12-e Lower side Shape of the inner circumferential surface 12-s under side of the square of the inner peripheral surface 12-1 Stepped inner circumferential surface 13 welded 14 tapering 15 receiving frame beam 16 Tateana 17 Sewer 18 road surface 19 Asphalt 20 sediment

Claims

マンホールの円形の受け枠（８−ｅ）の中の段つき面（９）の下側の円形の内周面（１２−ｅ）の中に入る円形の網状部材（１−ｅ）設け、その円形の網状部材（１−ｅ）を下側の円形の内周面（１２−ｅ）に取り付けるために円形の網状部材（１−ｅ）の外周に取り付ける板状の円形の取り付け用枠（３−ｅ）を設け、円形の受け枠（８−ｅ）の中の段つき面（９）の下側の円形の内周面（１２−ｅ）で網状部材（１−ｅ）を付けた円形の取り付け用枠（３−ｅ）を安定して支え取り付けるために板状のＵ形のフック（４）を設け、それらのＵ形のフック（４）の片方の板部である取り付け側の板部（４−１）を円形の受け枠（８−ｅ）の中の段つき面（９）の下側の円形の内周面（１２−ｅ）に円形の網状部材（１−ｅ）が傾かないようにＵ形のフック（４）を当分配列で数箇所に取り付け、それらのＵ形のフック（４）のＵ形の中に網状部材（１−ｅ）を付けた円形の取り付け用枠（３−ｅ）を入れることにより円形の網状部材（１−ｅ）は円形の受け枠（８−ｅ）の中の段つき面（９）の下側で支え取り付けられ、又、マンホールの四角形の受け枠（８−ｓ）にはその中の段つき面（９）の下側の四角形の内周面（１２−ｓ）の中に入る四角形の網状部材（１−ｓ）を設け、その四角形の網状部材（１−ｓ）を下側の四角形の内周面（１２−ｅ）に取り付けるために四角形の網状部材（１−ｓ）にはその外周に取り付ける四角形の板状の取り付け用枠（３−ｓ）を設け、四角形の受け枠（８−ｓ）の中の段つき面（９）の下側の四角形の内周面（１２−ｓ）で網状部材（１−ｓ）を付けた四角形の取り付け用枠（３−ｓ）を安定して支え取り付けるために板状のＵ形のフック（４）を設け、それらのＵ形のフック（４）の片方の板部である取り付け側の板部（４−１）を四角形の受け枠（８−ｓ）の中の段つき面（９）の下側の四角形の内周面（１２−ｓ）に四角形の網状部材（１−ｓ）が傾かないようにＵ形のフック（４）を平均して数箇所に取り付け、それらのＵ形のフック（４）のＵ形の中に網状部材（１−ｓ）を付けた四角形の取り付け用枠（３−ｓ）を入れることにより四角形の網状部材（１−ｓ）は四角形の受け枠（８−ｓ）の中の段つき面（９）の下側で支え取り付けられ、前記したマンホールの円形や四角形の受け枠（８−ｅ）（８−ｓ）の中の段つき面（９）の下側の円形や四角形の内周面（１２−ｅ）（１２−ｓ）に取り付けたＵ形のフック（４）はそのＵ形の中で支えられた網状部材（１−ｅ）（１−ｓ）を付けた円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）の上に位置するＵ形のフック（４）の取り付け側の板部（４−１）の反対側の板部であるボルト側の板部（４−２）にボルト穴（５−１）を設け、そのボルト穴（５−１）と同じ位置に当たる反対側のＵ形のフック（４）の取り付け側の板部（４−１）にボルトネジ穴を（５−２）設け、ボルト穴（５−１）に取り付け用ボルト（５）を通してボルトネジ穴（５−２）にねじ込むことによってボルトの軸の非ネジ部（５−３）で網状部材（１−ｅ）（１−ｓ）を付けた円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）が上に動かないようにして、さらに、その取り付け用ボルト（５）の位置から段階的に上下に調整することができるボルト側の板部（４−２）にボルト穴（５−１）とそのボルト穴と同じ位置になる取り付け側の板部（４−１）にボルトネジ穴（５−２）を数箇所設けることによりマンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）の下面と網状部材（１−ｅ）（１−ｓ）の上面との間隔距離が段階的に調整できるようになり、さらにＵ形のフック（４）の下側の底の部分の中央には調整用ボルト（６）のネジ穴（６−１）を設け、そのネジ穴（６−１）の下からナット（６−２）を嵌めた調整用ボルト（６）を入れＵ形のフック（４）の中にある円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）をボルト（６）の先で上下させ、前記の取り付け用ボルト（５）の軸の非ネジ部（５−３）の下側に当たるまで調整し、ナット（６−２）をＵ形フック（４）の底の下で締めて調整用ボルト（６）を固定することにより、円形や四角形の網状部材（１−ｅ）（１−ｓ）とそれらの網状部材（１−ｅ）（１−ｓ）を付けた円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）をマンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）の真下でＵ形フック（４）のＵ形の中で支え、網状部材（１−ｅ）（１−ｓ）を付けた円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）をＵ形のフック（４）の取り付け用ボルト（５）と調整用ボルト（６）で上下方向に位置調整ができるようにして、マンホールの受け枠（８−ｅ）（８−ｓ）の中の下側の内周面（１２−ｅ）（１２−ｓ）に網状部材（１−ｅ）（１−ｓ）とそれを付けた取り付け用枠（３−ｅ）（３−ｓ）をＵ形フック（４）で支え取り付けるようにして脱着可能にしたことを特徴とするマンホールの転落防止装置。 A circular mesh member (1-e) that enters a circular inner peripheral surface (12-e) below a stepped surface (9) in a circular receiving frame (8-e) of a manhole, and In order to attach the circular mesh member (1-e) to the lower circular inner peripheral surface (12-e), a plate-like circular attachment frame (3) attached to the outer periphery of the circular mesh member (1-e) -E), and the circular member (1-e) is attached to the circular inner peripheral surface (12-e) below the stepped surface (9) in the circular receiving frame (8-e). A plate-shaped U-shaped hook (4) is provided to stably support and mount the mounting frame (3-e), and a plate on the mounting side which is one plate portion of the U-shaped hook (4) The circular mesh member (1-e) is formed on the circular inner peripheral surface (12-e) below the stepped surface (9) in the circular receiving frame (8-e). Don't lean A round mounting frame (3-e) in which U-shaped hooks (4) are attached to several places in an array for the time being and a mesh member (1-e) is attached in the U-shape of those U-shaped hooks (4). ), The circular mesh member (1-e) is supported and attached to the lower side of the stepped surface (9) in the circular receiving frame (8-e). 8-s) is provided with a square mesh member (1-s) that enters the lower rectangular inner peripheral surface (12-s) of the stepped surface (9) therein, and the square mesh member In order to attach (1-s) to the lower quadrangular inner peripheral surface (12-e), the quadrangular mesh member (1-s) has a quadrangular plate-like mounting frame (3-s ) And a mesh member (1) on the rectangular inner peripheral surface (12-s) below the stepped surface (9) in the rectangular receiving frame (8-s). A plate-shaped U-shaped hook (4) is provided to stably support and mount the rectangular mounting frame (3-s) with s), and one of the U-shaped hooks (4) has a plate portion. A rectangular mesh member on the attachment side plate portion (4-1) on the rectangular inner peripheral surface (12-s) below the stepped surface (9) in the rectangular receiving frame (8-s). The U-shaped hooks (4) are attached to several places on average so that the (1-s) does not tilt, and the mesh member (1-s) is attached in the U-shape of the U-shaped hooks (4). By inserting a rectangular mounting frame (3-s), the rectangular mesh member (1-s) is supported and attached to the lower side of the stepped surface (9) in the rectangular receiving frame (8-s). The circular or square inner peripheral surface (1) below the stepped surface (9) in the circular or square receiving frame (8-e) (8-s) of the manhole described above. 2-e) The U-shaped hook (4) attached to (12-s) is for attaching a circular or square shape with a mesh member (1-e) (1-s) supported in the U-shape. A bolt-side plate portion (4-) which is a plate portion on the opposite side of the plate portion (4-1) on the attachment side of the U-shaped hook (4) located on the frame (3-e) (3-s). 2) A bolt hole (5-1) is provided, and a bolt screw hole is provided in the plate portion (4-1) on the mounting side of the U-shaped hook (4) on the opposite side that is in the same position as the bolt hole (5-1). (5-2) A mesh member (1) is provided at the non-threaded portion (5-3) of the bolt shaft by providing and screwing the bolt (5) for attachment into the bolt screw hole (5-2) through the bolt hole (5-1). -E) The circular or square mounting frame (3-e) with (1-s) (3-e) (3-s) should not be moved upward and further removed. The bolt-side plate part (4-2) that can be adjusted up and down in stages from the position of the bolt (5) for the bolt is attached to the bolt hole (5-1) and the mounting-side plate at the same position as the bolt hole By providing several bolt screw holes (5-2) in the portion (4-1), the lower surface of the circular or square manhole (7-e) (7-s) and the mesh member (1-e) (1- The distance between the upper surface of s) and the upper surface of the U-shaped hook (4) can be adjusted stepwise, and the screw hole (6-1) of the adjusting bolt (6) is provided at the center of the bottom portion of the U-shaped hook (4). ) And an adjustment bolt (6) fitted with a nut (6-2) from below the screw hole (6-1) is inserted, and a round or square mounting frame in a U-shaped hook (4) (3-e) (3-s) is moved up and down at the tip of the bolt (6), and the non-threaded portion of the shaft of the mounting bolt (5) (5- ) Until it hits the lower side, and tighten the nut (6-2) under the bottom of the U-shaped hook (4) to fix the adjustment bolt (6), so that a round or square mesh member (1- e) A circular or square mounting frame (3-e) (3-s) with (1-s) and their mesh members (1-e) (1-s) is used as a manhole circular or square lid. (7-e) A circular or square mounting frame (7-s), which is supported in the U-shape of the U-shaped hook (4) and has a mesh member (1-e) (1-s) ( 3-e) (3-s) can be adjusted in the vertical direction with the mounting bolt (5) and the adjusting bolt (6) of the U-shaped hook (4). e) A mesh member (1-e) (1-s) and a mounting frame with the inner peripheral surface (12-e) (12-s) on the lower inner peripheral surface (12-s) in (8-s) (3-e) An apparatus for preventing fall of a manhole, wherein (3-s) is supported by a U-shaped hook (4) so as to be removable.

マンホールの円形の受け枠（８−ｅ）の中の段つき面（９）の下側の円形の内周面（１２−ｅ）に入るように円形の網状部材（１−ｅ）を設け、円形の受け枠（８−ｅ）の中の段つき面（９）の下側の円形の内周面（１２−ｅ）に円形の網状部材（１−ｅ）を取り付けるために円形の網状部材（１−ｅ）の外周に円形の取り付け用枠（３−ｅ）を設け、又、マンホールの四角形の受け枠（８−ｓ）の中の段つき面（９）の下側の四角形の内周面（１２−ｓ）に入るように四角形の網状部材（１−ｓ）を設け、四角形の受け枠（８−ｓ）の中の段つき面（９）の下側の四角形の内周面（１２−ｓ）に四角形の網状部材（１−ｓ）を取り付けるために四角形の網状部材（１−ｓ）の外周に四角形の取り付け用枠（３−ｓ）を設け、マンホールの円形や四角形の蓋（７−ｅ）（７−ｓ）の真下に位置するように円形や四角形の受け枠（８−ｅ）（８−ｓ）の中の段つき面（９）の下側の円形や四角形の内周面（１２−ｅ）（１２−ｓ）に円形や四角形の網状部材（１−ｅ）（１−ｓ）とそれらの網状部材（１−ｅ）（１−ｓ）を付けた円形や四角形の取り付け用枠（３−ｅ）（３−ｓ）を設けたことを特徴とする１項記載のマンホールの転落防止装置。

A circular mesh member (1-e) is provided so as to enter the circular inner peripheral surface (12-e) below the stepped surface (9) in the circular receiving frame (8-e) of the manhole, A circular mesh member for attaching the circular mesh member (1-e) to the circular inner peripheral surface (12-e) below the stepped surface (9) in the circular receiving frame (8-e) A circular mounting frame (3-e) is provided on the outer periphery of (1-e), and the inner side of the lower square of the stepped surface (9) in the rectangular receiving frame (8-s) of the manhole A rectangular mesh member (1-s) is provided so as to enter the peripheral surface (12-s), and a rectangular inner peripheral surface below the stepped surface (9) in the rectangular receiving frame (8-s). In order to attach the square mesh member (1-s) to (12-s), a square attachment frame (3-s) is provided on the outer periphery of the square mesh member (1-s), and a manhole circle is provided. And the bottom of the stepped surface (9) in the circular or quadrangular receiving frame (8-e) (8-s) so as to be located directly below the quadrangular lid (7-e) (7-s) Circular or square mesh members (1-e) (1-s) and their mesh members (1-e) (1-s) are formed on the inner circumferential surfaces (12-e) (12-s). 2. The manhole fall prevention device according to claim 1, further comprising an attached circular or square mounting frame (3-e) (3-s).