JP2006257733A - Fall prevention device for underground structure - Google Patents

Fall prevention device for underground structure Download PDF

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Publication number
JP2006257733A
JP2006257733A JP2005075989A JP2005075989A JP2006257733A JP 2006257733 A JP2006257733 A JP 2006257733A JP 2005075989 A JP2005075989 A JP 2005075989A JP 2005075989 A JP2005075989 A JP 2005075989A JP 2006257733 A JP2006257733 A JP 2006257733A
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Prior art keywords
opening
fall prevention
prevention device
receiving frame
cover
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Takashi Inoue
崇 井上
Akira Takahashi
章 高橋
Eizo Takahashi
英三 高橋
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Miyama Corp
Nagashima Foundry Co Ltd
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Miyama Corp
Nagashima Foundry Co Ltd
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Priority to JP2005075989A priority Critical patent/JP2006257733A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fall prevention device for an underground structure capable of securely receiving a load applied to the cover part thereof. <P>SOLUTION: This device is installed at the opening part of a receiving frame forming the underground structure to prevent a man and an article from falling into the opening. The device comprises a body 23 having the plate-like cover part 21 of such a size and shape that can cover the opening part 11 of the receiving frame 10 for preventing the man and the article from falling and support parts 24, 25, 26, 27, 28, and 29 formed at the peripheral edge part of the cover part 21 for mounting on the inside of the opening part 11. The support parts 24, 25, 26, 27, 28, and 29 are formed to be continuously supported, over a necessary length, on a receiving part 12 formed on the inside of the opening part 11 to receive the load applied to the cover part 21 of the body 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、地下構造物を構成する受枠の開口部に取り付け、人や物などが開口内に転落するのを防止する装置に関するものである。   The present invention relates to an apparatus that is attached to an opening of a receiving frame constituting an underground structure and prevents a person or an object from falling into the opening.

人や物などがマンホールなどの開口内に転落するのを防止する器具や装置は各種存在しており、それらの具体的な形状には差があるが、格子状又は網状の構造が基本的なものであるといって良い。それらの転落防止装置は、地下構造物の受枠に何箇所かの係止部にて支えており、しかも各係止部は部分的であるので人の転落事故などが発生したときにその荷重が平均的に加わりにくく、往々にして片寄って加わるためその荷重を支え切れず、安全を十分に確保できないおそれがあった。まして、マンホール内における硫化水素ガス等による腐食環境に耐えるために、耐食性のある合成樹脂によって製作されたものの場合には、大荷重に耐えることはより困難となる。   There are various types of instruments and devices that prevent people and objects from falling into openings such as manholes, and there are differences in their specific shapes, but a lattice or net structure is fundamental. It can be said that it is a thing. These fall prevention devices are supported on the receiving frame of the underground structure by several locking parts, and each locking part is partial, so when a human fall accident etc. occurs, the load is On average, it is difficult to add, and since it is often offset, the load cannot be supported, and there is a risk that sufficient safety cannot be ensured. Furthermore, in order to withstand the corrosive environment caused by hydrogen sulfide gas or the like in the manhole, it is more difficult to endure a heavy load in the case of those made of a corrosion-resistant synthetic resin.

これに対して、実開平4−138441号や特開平10−338942号、或いは特開平11−131512号の転落防止蓋は取り付け座を等間隔に数箇所設けており、荷重はほぼ均等に加わると考えられる。しかしながら、上記のものの場合の取り付け座として、受枠の中心側に臨む弦を受枠の中心線と直交する直線状に設けているため、受枠の有効径を狭めることになるという問題がある。有効径は受枠下端における開口部の内径と規定されているが、上記の発明考案では受枠の有効径よりも取り付け座は小径となるので、例えば公称600φでも実際は600ミリメートルの有効径に足りないという事態が起こることになる。   On the other hand, the falling prevention lids of Japanese Utility Model Laid-Open Nos. 4-138441, 10-338942, or 11-131512 are provided with several mounting seats at equal intervals, and the load is applied almost evenly. Conceivable. However, since the string facing the center side of the receiving frame is provided in a straight line perpendicular to the center line of the receiving frame as the mounting seat in the above case, there is a problem that the effective diameter of the receiving frame is narrowed. The effective diameter is defined as the inner diameter of the opening at the lower end of the receiving frame. However, in the above invention, the mounting seat is smaller than the effective diameter of the receiving frame. For example, even with a nominal 600φ, the effective diameter of 600 mm is actually insufficient. Things will happen.

また、特開2001−20307号、同2002−61214号、同2003−206543号などに見られるように、格子や網の目が大きい場合には、小石やボルト、ナットなどがマンホール内に落下するのを止められず、下流のポンプ室のポンプ等の設備を破損するおそれがある。転落防止装置と共に断熱用の中蓋を併用することにより、小石等の落下を防ぐことも可能となるが、外光が遮断され、マンホール内における作業を妨げるの
で、照明が必要となり、電源を確保しなければならないなど新たな問題を生ずる。また、この種の装置は外部から着脱することを想定して設計されているので、1人で作業しなければならない場合、マンホール内にいる状態では、装置を取り外して外へ出るために手間取ることになる。
In addition, as seen in Japanese Patent Application Laid-Open Nos. 2001-20307, 2002-61214, 2003-206543, etc., pebbles, bolts, nuts, etc. fall into the manhole when the lattice or mesh is large. Therefore, there is a risk that equipment such as a pump in the downstream pump chamber may be damaged. It is possible to prevent the fall of pebbles and the like by using an inner lid for heat insulation together with the fall prevention device, but the outside light is blocked and the work in the manhole is obstructed, so lighting is necessary and a power supply is secured. There are new problems that must be done. Also, this type of device is designed to be attached and detached from the outside, so if you have to work alone, take time to remove the device and get out when you are in the manhole. become.

実開平4−138441号Utility Kaihei 4-138441 特開平10−338942号JP 10-338942 A 特開平11−131512号JP-A-11-131512 特開2001−20307号JP 2001-20307 A 特開2002−61214号JP 2002-61214 A 特開2003−206543号JP 2003-206543 A

本発明は前記の点に着目してなされたものであり、その課題は、転落防止装置の覆い部に加わる荷重を確実に受け止めることができる地下構造物用転落防止装置を提供することである。また本発明の他の課題は、受枠の有効径を狭めず、かつまたマンホール内での作業中に使用するものとしてより好適な性能を有する地下構造物用転落防止装置を提供することである。   This invention is made paying attention to the said point, The subject is providing the fall prevention apparatus for underground structures which can receive reliably the load added to the cover part of a fall prevention apparatus. Another object of the present invention is to provide a fall prevention device for an underground structure that does not reduce the effective diameter of the receiving frame and has a more suitable performance for use during work in a manhole.

前記の課題を解決するため、本発明は、地下構造物を構成する受枠の開口部に取り付
け、人や物などが開口内に転落するのを防止する装置について、人や物などの転落を防止するために受枠の開口部を覆う大きさ及び形状を有する板状の覆い部と、開口部の内側に取り付けるために、覆い部の周縁部に設けた支持部とを有する本体を具備し、支持部は、本体の覆い部に加わる荷重を受け止めるために、開口部の内側に設けられている受け止め部に、必要な長さにわたって連続的に支持されるように設け、受け止め部の主要部は、受枠の有効径を規定する箇所よりも外側かつ受枠のほぼ最下部に設けるという手段を講じたものである。
In order to solve the above-mentioned problems, the present invention is a device that is attached to the opening of a receiving frame constituting an underground structure and prevents a person or an object from falling into the opening. And a main body having a plate-like cover portion having a size and a shape covering the opening portion of the receiving frame and a support portion provided at a peripheral edge portion of the cover portion for mounting inside the opening portion. In order to receive the load applied to the cover part of the main body, the part is provided so as to be continuously supported over the required length on the receiving part provided inside the opening, and the main part of the receiving part is Means are provided that are provided outside the portion that defines the effective diameter of the receiving frame and substantially at the bottom of the receiving frame.

本発明に係る転落防止装置は、いわゆるマンホールやハンドホールなど、地下構造物を構成しているものの開口部に取り付け、蓋を開けて開口部を開いている間に、その内部に人や物などが転落ないし落下することを防止する装置である。従って、この転落防止装置は、人や物などの転落を防止するために受枠の開口部を覆う手段として板状の覆い部を必要とし、覆い部を開口部の内側に取り付ける手段として支持部を必要とする。なお覆い部を開口部の内側に取り付けるのは、不使用時に本体を取り付けたまま開口部に蓋をして閉じるためである。   The fall prevention device according to the present invention is attached to an opening of what constitutes an underground structure such as a so-called manhole or handhole, and a person or an object is placed inside the opening while the lid is opened. Is a device that prevents falling or falling. Therefore, this fall prevention device requires a plate-like cover as a means for covering the opening of the receiving frame in order to prevent a person or an object from falling, and the support as a means for attaching the cover to the inside of the opening. I need. The reason why the cover is attached to the inside of the opening is to close the opening with a cover while the main body is attached when not in use.

本発明における覆い部は、格子状や網状ではなく板状とする。板状であることによっ
て、小石やボルト、ナットなどを受け止め、地下構造物内への落下を防ぐことができるからである。その材質については限定しないが、製作の容易さから、合成樹脂か金属のどちらかが有力となる。支持部は、覆い部の周縁部に設けられ、覆い部と一体となって本体を構成する。従来の支持部に相当する部分は、概して部分的に受枠側の受け座に支持されており、覆い部に荷重がかかった場合、点状の係止部が荷重に耐え切れずに、外れたり、破損したりする可能性があるため、本発明では点状よりも線状に連続した広範囲の支持部を設ける。
The covering portion in the present invention is not a lattice shape or a net shape but a plate shape. It is because it can receive a pebble, a bolt, a nut, etc. by being plate-shaped, and can prevent falling into an underground structure. The material is not limited, but either synthetic resin or metal is dominant for ease of manufacture. A support part is provided in the peripheral part of a cover part, and comprises a main body united with a cover part. The part corresponding to the conventional support part is generally partially supported by a receiving seat on the receiving frame side, and when a load is applied to the cover part, the point-like locking part cannot withstand the load and comes off. In the present invention, a wide range of support portions that are continuous in a line shape rather than a dot shape are provided.

即ち支持部は、覆い部に加わった荷重を受け止め、受枠側の受け座である受け止め部に伝えるため、荷重を集中させずに分散するように必要な長さにわたって受け止め部と接触するように設けられている。支持部は、全周360度のほぼ全域にて均等に転落事故の荷重を受け止められるものであることも必要である。従って、支持部に求められる力学的な条件は、線状に連続して荷重を受け、かつ受け止め部に伝え得ることと、全周360度のほぼ全域にて均等に荷重を負担し得るようにすること、の2点であると考えて良く、これらによって本体に加わる荷重を特定の数点に集中させることなく分散し、確実に受け止めることができるものとなる。   In other words, the support part receives the load applied to the cover part and transmits it to the receiving part, which is a receiving seat on the receiving frame side, so that it is in contact with the receiving part for the necessary length so as to disperse the load without concentrating it. It has been. It is also necessary for the support portion to be able to receive the load of the fall accident evenly in almost the entire region of the entire circumference of 360 degrees. Accordingly, the mechanical conditions required for the support portion are such that the load can be continuously received in a linear manner and transmitted to the receiving portion, and the load can be evenly distributed over almost the entire circumference of 360 degrees. The load applied to the main body can be dispersed without being concentrated on a specific number of points, and can be received with certainty.

受け止め部は、受枠の開口部の内側に設けられている構造部分を利用する。例えば、受枠の下面又はその近傍にあって内方に向かって突出するように設けられている内突縁や、開口部の内側に設けられている手掛けなどは受け止め部として使用することができる構造部分に該当する。他に受け止め部となり得るのは、蓋受け部として受枠の開口部に設けられ、上方からの荷重を負担し得る箇所であり、例えば蓋の外周のテーパー面を受け止めるテーパー鉄蓋用受枠では、受け止めた鉄蓋の食い込みを止める受け止め駒などを設けている部分がある。例えば、左右対称に手掛けと、その反対側の部分及びその中間の3箇所に支持部を設定する実施例の場合、計6箇所に線状の支持部が分散し、ほぼ均等な荷重負担が実現可能になる。これらの受け止め部の内、主要部は、受枠の有効径を規定する箇所よりも外側かつ受枠のほぼ最下部に設けるものとし、それによって受枠の有効径が狭められないようにする。この目的を達する受け止め部の主要部は、受枠の最下部に設けられている内突縁が該当する。また主要部とは、受け止め部の中の主だったものの意味であり、全ての受け止め部の中で占める割合も最大となる部分である。   The receiving portion uses a structural portion provided inside the opening of the receiving frame. For example, a structure that can be used as a receiving portion such as an inner protruding edge provided on the lower surface of the receiving frame or in the vicinity thereof and protruding inward or a handle provided inside the opening. Corresponds to the part. The other part that can be a receiving part is a part that is provided at the opening of the receiving frame as a lid receiving part and can bear a load from above. For example, in a receiving frame for a tapered iron lid that receives the tapered surface of the outer periphery of the lid, There is a part that has a receiving piece to stop the biting of the iron lid. For example, in the case of the embodiment in which the handle is set symmetrically and the support part is set at the opposite part and three parts in the middle, the linear support part is dispersed in a total of six places, and an almost equal load is realized. It becomes possible. Among these receiving portions, the main portion is provided outside the portion that defines the effective diameter of the receiving frame and substantially at the lowest part of the receiving frame, thereby preventing the effective diameter of the receiving frame from being reduced. The main part of the receiving part that achieves this purpose corresponds to an inner protruding edge provided at the lowermost part of the receiving frame. Further, the main part means the main part in the receiving part, and the ratio of all the receiving parts is the largest.

本体が透明でない材料によって形成される場合、本体を開口部の内側に取り付けた状態において、開口部の内方にて作業が可能な照度を得るために明かり取りとなる透孔を多数形成することができる。透孔は、孔径を大きくし過ぎると小石等の落下を止めるのに不利となり、逆に小さくし過ぎれば光を遮断する傾向となり、孔数を著しく増やさなければならないので、その折り合いを見つける必要がある。本発明では、工場の照度基準に関するJISの規定の内で、一般の製造工程の視作業に必要とされている300〜750ルクスから、春期の日中に少なくとも300ルクスがマンホールの深さ2m地点で得られることを目標として全ての透孔の合計面積を設定した。明かり取りとなる透孔には、閉塞栓を組み付けてその一部又は全部を閉塞可能として、物や雨、汚水等が入り込むのを防止することができる。   When the main body is formed of a material that is not transparent, in the state where the main body is attached to the inside of the opening, a large number of through-holes that can be used for light can be formed in order to obtain an illuminance that allows work to be performed inside the opening Can do. If the hole diameter is too large, it will be disadvantageous to stop the fall of pebbles, etc. Conversely, if it is too small, it will tend to block the light, and the number of holes must be increased significantly, so it is necessary to find the compromise is there. In the present invention, within 300 750 lux, which is required for visual work in general manufacturing processes, within the JIS regulations on factory illuminance standards, at least 300 lux is located at a depth of 2 m in the manhole during the spring day. The total area of all the through holes was set with the goal of being obtained in An obstruction stopper can be attached to the through-hole to be lighted so that part or all of the obstruction plug can be obstructed, thereby preventing entry of objects, rain, sewage, and the like.

本体には、開口部の内方から転落防止装置を取り外すことを可能にするために、本体を手でつかむための取っ手を貫通状に設けることができる。内方から取っ手を手でつかむことができるため、転落防止装置を確実に受枠に取り付け、また無理なく取り外すことができるようになる。また本体には、反射板を覆い部又はその他の箇所に設け、開口部の存在を知らせて危険を回避する措置を取ることができる。このためには、本体全体を黄又は赤等によって着色するのも良い。このような構成を有する転落防止装置はプラスチック成形品として製造することができるが、そのために各部に構造強度を向上する手段を具備させることが有効であり、それによって本体に加わる荷重に耐え、かつ受枠に伝え得るものとなる。また強度向上手段に加えて、荷重による本体の変形に伴って、支持部が受け止め部からずれ動くのを止めるずれ止め手段を具備することも有効である。   The main body can be provided with a handle for gripping the main body by hand so as to allow the fall prevention device to be removed from the inside of the opening. Since the handle can be grasped by hand from the inside, the fall prevention device can be securely attached to the receiving frame and removed without difficulty. In addition, the main body can be provided with a reflecting plate in a covering portion or other places to take measures to avoid danger by informing the presence of the opening. For this purpose, the entire main body may be colored with yellow or red. Although the fall prevention device having such a structure can be manufactured as a plastic molded product, it is effective to equip each part with means for improving the structural strength, thereby withstanding the load applied to the main body, and It can be communicated to the receiving frame. In addition to the strength improving means, it is also effective to have a detent means for stopping the support part from moving from the receiving part as the main body is deformed by a load.

本発明は以上の如く構成されかつ作用するものであるから、転落防止装置の覆い部に加わる荷重を、所要の長さにわたって設けられている支持部によって受枠側の受け止め部に伝えられるので、荷重を特定箇所に集中させずに分散することができ、転落防止装置により確実に安全に人や物などの転落を防止することができるとともに、受枠の有効性を狭めることがない。また本発明によれば、マンホール内での作業に必要な照度を得ることが可能であるとともに、1人でも本装置の装着を行うことができ、また通行人等に対しては地上に開口部であることを知らせることができるので、マンホール内での作業中に使用するものとしてより好適な性能を発揮する。   Since the present invention is configured and operates as described above, the load applied to the cover part of the fall prevention device is transmitted to the receiving part on the receiving frame side by the support part provided over the required length. Can be dispersed without concentrating them at a specific location, and the fall prevention device can reliably prevent the fall of a person or an object, and does not reduce the effectiveness of the receiving frame. Further, according to the present invention, it is possible to obtain the illuminance necessary for the work in the manhole, and even one person can attach the apparatus, and an opening on the ground for passersby etc. Therefore, it is possible to show more suitable performance for use during work in a manhole.

以下図示の実施形態を参照して本発明をより詳細に説明する。図1は本発明に係る転落防止装置20を示しており、図2はそれを地下構造物の受枠10に取り付けたものを示している。例示のものは、受枠10の開口部11を覆う大きさ及び形状を有する板状の覆い部21を有し、その周縁部には立ち上がり部22が設けられていて全体を皿型構造として立体化し、構造強度を高めている。覆い部21の周囲の立ち上がり部22の外側には、幾つかの部分に分かれた支持部24…が設けられている。覆い部21、立ち上がり部22及び支持部24…を含む全体で本体23を構成している。   Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. FIG. 1 shows a fall prevention device 20 according to the present invention, and FIG. 2 shows that it is attached to a receiving frame 10 of an underground structure. The illustrated one has a plate-like cover portion 21 having a size and a shape covering the opening portion 11 of the receiving frame 10, and a rising portion 22 is provided at the peripheral portion thereof, so that the whole is three-dimensionalized as a dish-shaped structure. , Increase the structural strength. On the outside of the rising part 22 around the cover part 21, support parts 24... Divided into several parts are provided. The main body 23 is configured as a whole including the cover portion 21, the rising portion 22, and the support portions 24.

第1の支持部24、25は、受枠10の開口部内の下面近くにて内方へ向かって突出するように、ほぼ全周にわたって設けられた内突縁13の上面を止め部12としてそこに係止される(図9参照)。内突縁13は受枠10のほぼ最下部にほぼ全域にわたって設けてあり、受け止め部の主要部であるので、最も広い範囲にわたって第1支持部24、25を支持する箇所となる。なお、例示の受枠10の有効径は内突縁13の部分における内径である。支持部の内の第1の部分である支持部24、25は、本体23の立ち上がり部22の外周に外方へ向かって突出するように、かつ周方向に沿って所要の長さにわたって設けられた部分である。図3Bに示されているように、第1の支持部24、25は円弧形の形状を有し、中心角aが約50度の範囲のものを、蓋体をロックする装置に臨む側に左右対称に2箇所設けている(図7参照)。   The first support portions 24 and 25 are provided with the upper surface of the inner projecting edge 13 provided substantially over the entire circumference so as to protrude inward near the lower surface in the opening of the receiving frame 10 as a stop portion 12. Locked (see FIG. 9). The inner projecting edge 13 is provided at almost the lowermost part of the receiving frame 10 over almost the entire region and is the main part of the receiving part. Therefore, the inner protruding edge 13 is a place for supporting the first support parts 24 and 25 over the widest range. The effective diameter of the illustrated receiving frame 10 is the inner diameter of the inner projecting edge 13. The support parts 24 and 25, which are the first parts of the support parts, are provided on the outer periphery of the rising part 22 of the main body 23 so as to protrude outward and over a required length along the circumferential direction. Part. As shown in FIG. 3B, the first support portions 24, 25 have an arc shape and have a central angle a in the range of about 50 degrees facing the device for locking the lid. Are provided symmetrically at two locations (see FIG. 7).

第2の部分である支持部26、27は、本体23の立ち上がり部22の上端を外縁として本体23の上面に、ほぼ周方向に沿って所要の長さにわたって設けられている。例示の第2の支持部26、27は、図7から理解されるように中心角bにして約40度に及ぶ直線状の部分であり、左右対称に2箇所設けている。第2の支持部26、27を係止させる受け止め部12は、受枠10のヒンジ部の左右両側に設けられている手掛け14の上面を利用する(図7、図9参照)。   The support portions 26 and 27 as the second portion are provided on the upper surface of the main body 23 over the required length substantially along the circumferential direction with the upper end of the rising portion 22 of the main body 23 as the outer edge. As illustrated in FIG. 7, the illustrated second support portions 26 and 27 are linear portions extending about 40 degrees with respect to the central angle b, and are provided in two symmetrical directions. The receiving part 12 that locks the second support parts 26 and 27 uses the upper surface of the handle 14 provided on the left and right sides of the hinge part of the receiving frame 10 (see FIGS. 7 and 9).

第3の部分である支持部28、29は、立ち上がり部22の上端に続く本体23の上面に外方へ向かって鉤状に突出した形で、本体23の中央部左右に設けられており(図5参照)、中心角cが10度ほどで、所要の長さにわたって受枠側に係止する。これは実施例の中では最も短いものであるが、その受け止め部12は、テーパー鉄蓋用受枠10に受け止め駒15を設けている内周縁16の上面であり、複数個設けても良い(図7、図9参照)。   The support portions 28 and 29 as the third portion are provided on the left and right of the central portion of the main body 23 in a shape protruding outward from the upper surface of the main body 23 following the upper end of the rising portion 22 ( 5), the central angle c is about 10 degrees, and it is locked to the receiving frame side over a required length. Although this is the shortest in the embodiment, the receiving portion 12 is the upper surface of the inner peripheral edge 16 in which the receiving piece 15 is provided on the taper iron lid receiving frame 10, and a plurality of the receiving portions 12 may be provided (see FIG. 7, see FIG.

このような支持構成は、第1の支持部24、25と、第2の支持部26、27の合計で全周360度の2分の1の約180度に達し、さらに第3の支持部28、29を加えて約200度の範囲にわたっており、かつまた開口部11のロック部側に第1の支持部24、25、中央左右に第3の支持部28、29そしてヒンジ部側の左右の第2の支持部26、27というように数個のものが均等に分散して設けられている。これらの数箇所の支持部は、地下構造物の受枠10の開口部11に設けられている、鉄蓋の固定のためのヒンジ部17とロック部18を結ぶ中心線に対して左右対称となるように配置されている。また本体23は、ロック部18との抵触を回避する凹部31と、ヒンジ部17との抵触を回避する切欠部32を具備した、全体として強固な立体構造を有しており、覆い部21に転落事故の荷重がかかったときには、強度向上手段によって変形が防止され、また受枠10との間のずれ止め手段によってずれ動くことがなく、荷重を全部受枠10の受け止め部12としての内突縁13、手掛け14及び内周縁16に伝える構成である。強度向上手段として実施例では、第1の支持部24、25の下面に複数のリブ22aを形成するとともに支持部周縁に立ち下がり縁部22bを設けて立体化し、本体23の透孔33を1個毎に囲む箱型のリブ22cを設け、また本体覆い部21と第2支持部側隆起部の間に段部22dを形成し剛性を高めている。ずれ止め手段の一つは、前記の手掛け14、14に係止する第2の支持部26、27であり、もう一つのずれ止め手段は第1の支持部24、25の厚肉部分に形成した係止口19aであり、受枠10の内突縁13の上に突設された突起19bに係止する。図10、図11E参照。   Such a support structure reaches about 180 degrees, which is a half of the entire circumference of 360 degrees, by the total of the first support parts 24 and 25 and the second support parts 26 and 27, and the third support part. 28, 29 and over the range of about 200 degrees, and also the first support portions 24, 25 on the lock portion side of the opening 11, the third support portions 28, 29 on the center left and right, and the left and right on the hinge portion side. Several second support portions 26 and 27 are provided in an evenly distributed manner. These several support portions are symmetrical with respect to a center line that is provided in the opening 11 of the receiving frame 10 of the underground structure and connects the hinge portion 17 and the lock portion 18 for fixing the iron lid. Are arranged as follows. The main body 23 has a solid three-dimensional structure as a whole, including a recess 31 that avoids conflict with the lock portion 18 and a notch 32 that avoids conflict with the hinge portion 17. When a load due to a fall accident is applied, deformation is prevented by the strength improving means, and the inner protrusion edge 13 as the receiving portion 12 of the receiving frame 10 is not displaced by the shifting preventing means with respect to the receiving frame 10. In this configuration, the handle 14 and the inner peripheral edge 16 are transmitted. In the embodiment as a strength improving means, a plurality of ribs 22a are formed on the lower surfaces of the first support portions 24 and 25, and falling edges 22b are provided on the periphery of the support portion to form a three-dimensional structure. Box-shaped ribs 22c are provided for each piece, and a step portion 22d is formed between the main body covering portion 21 and the second support portion-side raised portion to enhance rigidity. One of the detent means is the second support portions 26 and 27 that are locked to the handles 14 and 14, and the other detent means is formed in the thick part of the first support portions 24 and 25. The locking opening 19a is engaged with a protrusion 19b protruding on the inner protruding edge 13 of the receiving frame 10. See FIGS. 10 and 11E.

さらに、本体23の覆い部21には板面を貫通する透孔33がほぼ全面にわたって均等に開けられており、明かり取りとなる。例示した透孔33は、春期における日中午後、関東地方において実験した結果に基づいて開けられているもので、開口部11よりの深さ2メートルの地点における照度が300ルクスとなるように、孔径15ミリメートルの透孔33を開口部11の面積の約20パーセント開口したものに相当する。これは一実施例であり、より照度を上げること或いは下げることは自由であるから、特に実験時期が春であったことを考慮し、冬期或いは関東地方よりも東北方での条件を重視する場合にはより開口率を上げることが必要であろうし、逆に夏期或いは関東地方よりも西南方での条件を重視する場合にはより開口率を下げることが必要となるであろう。透孔33には閉塞栓41を組み付けることができる(図12参照)。閉塞栓41は、1個の透孔33に1個ずつ組み付けるものでも良いし、複数個の透孔33をまとめて閉塞するように組み付けるものでも良い。   Further, the cover portion 21 of the main body 23 is provided with the through holes 33 penetrating the plate surface almost uniformly over the entire surface, thereby providing light. The illustrated through-hole 33 is opened based on the results of experiments in the Kanto region during the daytime afternoon in spring, so that the illuminance at a point 2 meters deep from the opening 11 is 300 lux. This corresponds to a through hole 33 having a hole diameter of 15 millimeters and having an opening of about 20 percent of the area of the opening 11. This is an example, and it is free to raise or lower the illuminance. Therefore, considering the fact that the experiment was in spring, especially when the conditions in the Tohoku region are more important than the winter or Kanto region. However, it may be necessary to increase the aperture ratio, and conversely if the conditions in the southwest direction are more important than in the summer or Kanto region, it will be necessary to decrease the aperture ratio. A blocking plug 41 can be assembled in the through-hole 33 (see FIG. 12). The closing plugs 41 may be assembled one by one in one through hole 33 or may be assembled so as to block a plurality of through holes 33 together.

本体23には、手でつかむための取っ手35、36を設けている。取っ手35、36
は、前記凹部31及び切欠部32を設けた箇所に、立ち上がり部22の上端に達する貫通部37、38を設けることによって、手を差し入れつかむことができるように設けられている。取っ手35、36は作業者が両手を使って本体23をつかむことができるように、本体23の直径方向の両端に位置する辺りに設けている。また、本体23の覆い部21には反射板取り付け部39を形成し、そこに別製の反射板40を取り付けている(図2、図7、図11D参照)。さらに本体23には全体の視認性を高めるため、黄色に着色を施している。
The main body 23 is provided with handles 35 and 36 for grasping by hand. Handle 35, 36
Is provided so that a hand can be inserted and grasped by providing penetrating portions 37 and 38 reaching the upper end of the rising portion 22 at a location where the concave portion 31 and the notch portion 32 are provided. The handles 35 and 36 are provided around the diametrical ends of the main body 23 so that the operator can hold the main body 23 using both hands. Further, a reflection plate attachment portion 39 is formed on the cover portion 21 of the main body 23, and a separate reflection plate 40 is attached thereto (see FIGS. 2, 7, and 11D). Further, the main body 23 is colored yellow to improve the overall visibility.

本発明の転落防止装置20を受枠10に装着した状態は、図7以下に示されており、図7の横断面は図8、図9に、また図8、図9の要部は図11に夫々示されている。図7により、受枠10の開口部11は、ヒンジ部両側を除いて全域が本発明装置の本体23によって覆われており、本体23は、第1の支持部24、25、第2の支持部26、27及び第3の支持部28、29によって全周360度の55パーセントに及ぶ約200度の範囲において、広範囲の線状の連続的接触によって支えられ、外力に対しても安定性を保持していることが分かる。即ち、中心角aが約50度に及ぶ第1の支持部24、25は図9及び図11Aに示すように受枠下面に近い、受け止め部12の主要部である内突縁13に支持され、中心角bが約40度に及ぶ第2の支持部26、27は図9及び図11Bに示すように手掛け14に支持され、第3の支持部28、29は第1、第2の支持部24、25、26、27の中間にて受枠10の内周縁16に10度余りの中心角cで支持され(図9及び図11C)、本体23に加えられるであろう転落事故による荷重を、本体周縁部にて連続的に支持するものである。   The state in which the fall prevention device 20 of the present invention is mounted on the receiving frame 10 is shown in FIG. 7 and subsequent figures. FIG. 7 is a cross-sectional view of FIG. 7, and FIG. Respectively. 7, the opening 11 of the receiving frame 10 is entirely covered with the main body 23 of the device of the present invention except for both sides of the hinge portion. The main body 23 includes the first support portions 24 and 25 and the second support portion. 26, 27 and the third support portions 28, 29 are supported by a wide range of linear continuous contact in a range of about 200 degrees, which covers 55 percent of the entire circumference of 360 degrees, and maintain stability against external forces. You can see that That is, the first support portions 24 and 25 having a central angle a of about 50 degrees are supported by the inner projecting edge 13 which is the main portion of the receiving portion 12 near the lower surface of the receiving frame as shown in FIGS. 9 and 11A. The second support portions 26 and 27 having a central angle b of about 40 degrees are supported by the handle 14 as shown in FIGS. 9 and 11B, and the third support portions 28 and 29 are the first and second support portions. 24, 25, 26, 27 is supported by the inner peripheral edge 16 of the receiving frame 10 at a central angle c of about 10 degrees (FIGS. 9 and 11C), and a load caused by a fall accident that will be applied to the main body 23, It is supported continuously at the periphery of the main body.

本発明の転落防止装置20は上述のようにして実施することができるものであり、強度向上手段及びずれ止め手段を有し、受枠10のほぼ全周でほぼ均等に転落事故の荷重を受け止めるといって良いものであるので、特に広範囲に及ぶ線状の第1支持部24、25、第2支持部26、27は荷重の均等分散を実現し、第2支持部26、27と手掛け14、14及び係止口19aと突起19bの各係止部分は、ずれ止めを果たし、さらに大荷重を受けた場合にも破壊に耐える。本発明に係る転落防止装置20は、プラスチックを材料として、高強度のものを製作することができ、また覆い部21に設ける透孔33については孔径及びピッチを10〜15ミリメートルとすることによって小石等の落下を効果的に防ぐことができ、かつまたマンホール内における人工照明なしでの作業が保証される。   The fall prevention device 20 of the present invention can be implemented as described above, has strength improvement means and slip prevention means, and receives the load of the fall accident almost uniformly around the entire circumference of the receiving frame 10. In particular, the linear first support portions 24 and 25 and the second support portions 26 and 27 that are in a wide range achieve even distribution of the load, and the second support portions 26 and 27 and the handle 14, 14 and the locking portions of the locking port 19a and the protrusion 19b serve to prevent slippage and withstand destruction even when subjected to a heavy load. The fall prevention device 20 according to the present invention can be made of a high strength material made of plastic, and the through hole 33 provided in the cover portion 21 is made of pebbles by setting the hole diameter and pitch to 10 to 15 millimeters. Can be effectively prevented, and the operation without artificial lighting in the manhole is also guaranteed.

本発明においては、受け止め部の主要部は、受枠の有効径を規定する箇所よりも外側かつ受枠のほぼ最下部に設けてそこに第1の支持部24、25を支持させるため、受枠の有効径が損なわれず、人の出入りの妨げにならないものである。また、受け止め部12の主要部を受枠10の最下部に設けているため転落防止装置20を最も低い位置に配置することになり、上部に広い空間を取ることができるので蓋体裏面との干渉が起こらないという特徴がある。   In the present invention, the main portion of the receiving portion is provided outside the portion that defines the effective diameter of the receiving frame and substantially at the lowermost portion of the receiving frame, and supports the first support portions 24 and 25 there. The diameter is not impaired, and it does not interfere with people coming and going. Moreover, since the main part of the receiving part 12 is provided in the lowest part of the receiving frame 10, the fall prevention apparatus 20 will be arrange | positioned in the lowest position, and since a large space can be taken in upper part, it interferes with a cover body back surface. There is a feature that does not occur.

本発明に係る地下構造物用転落防止装置の1実施例を示す斜視図。The perspective view which shows one Example of the fall prevention apparatus for underground structures which concerns on this invention. 図1の装置を受枠に取り付けた斜視図。The perspective view which attached the apparatus of FIG. 1 to the receiving frame. Aは図1の装置の本体の背面図、Bは同じく平面図、Cは同じく正面図。A is a rear view of the main body of the apparatus of FIG. 1, B is a plan view, and C is a front view. 図3BのIV−IV線断面図。The IV-IV sectional view taken on the line of FIG. 3B. 図3BのV−V線断面図。The VV sectional view taken on the line of FIG. 3B. 図1の装置の本体の底面図。FIG. 2 is a bottom view of the main body of the apparatus of FIG. 1. 図1の装置を受枠に取り付けた状態を示す平面図。The top view which shows the state which attached the apparatus of FIG. 1 to the receiving frame. 図7のVIII−VIII線断面図。VIII-VIII sectional view taken on the line of FIG. 図7のIX−IX線断面図。IX-IX sectional view taken on the line of FIG. 図7のX−X線断面図。XX sectional drawing of FIG. Aは図9のA部分の、Bは図9のB部分の、Cは図8のC部分の、Dは図9のD部分の、Eは図10のE部分の拡大断面図。9A is an enlarged cross-sectional view of a portion A in FIG. 9, B is a portion B in FIG. 9, C is a portion C in FIG. 8, D is a portion D in FIG. 9, and E is a portion E in FIG. 閉塞栓を組み付けた状態を示す図1の装置の本体の断面図。Sectional drawing of the main body of the apparatus of FIG. 1 which shows the state which assembled | attached the obstruction | occlusion stopper.

符号の説明Explanation of symbols

10 受枠
11 開口部
12 受け止め部
13 内突縁
14 手掛け
16 内周縁
20 転落防止装置
21 覆い部
22 立ち上がり部
23 本体
24、25 第1の支持部
26、27 第2の支持部
28、29 第3の支持部
33 透孔
35、36 取っ手
40 反射板
41 閉塞栓
DESCRIPTION OF SYMBOLS 10 Receiving frame 11 Opening part 12 Receiving part 13 Inner projecting edge 14 Handle 16 Inner peripheral edge 20 Fall prevention device 21 Cover part 22 Standing part 23 Main body 24, 25 First support part 26, 27 Second support part 28, 29 Third Supporting part 33 Through hole 35, 36 Handle 40 Reflecting plate 41 Blocking plug

Claims (7)

地下構造物を構成する受枠の開口部に取り付け、人や物などが開口内に転落するのを防止する装置であって、人や物などの転落を防止するために受枠の開口部を覆う大きさ及び形状を有する板状の覆い部と、開口部の内側に取り付けるために、覆い部の周縁部に設けた支持部とを有する本体を具備し、支持部は、本体の覆い部に加わる荷重を受け止めるために、開口部の内側に設けられている受け止め部に、必要な長さにわたって連続的に支持され、受け止め部の主要部は、受枠の有効径を規定する箇所よりも外側かつ受枠のほぼ最下部に設けられていることを特徴とする地下構造物用転落防止装置。 A device that is attached to the opening of the receiving frame that constitutes the underground structure and prevents people and objects from falling into the opening, and is large enough to cover the opening of the receiving frame to prevent the falling of people and objects. A body having a plate-like cover having a thickness and a shape, and a support provided on the periphery of the cover to be attached to the inside of the opening, the support being a load applied to the cover of the body In order to receive, the receiving part provided inside the opening is continuously supported over a necessary length, and the main part of the receiving part is outside the portion defining the effective diameter of the receiving frame and the receiving frame. A fall prevention device for underground structures, characterized in that it is provided almost at the bottom. 受け止め部は、受枠の下面近くにて内方へ向けて設けられている内突縁や、開口部の内側に設けられている手掛けを含んでおり、それらは開口部の円周方向にほぼ沿った形態を有している請求項1記載の地下構造物用転落防止装置。 The catching portion includes an inner protruding edge provided inward near the lower surface of the receiving frame and a handle provided on the inner side of the opening, which are substantially along the circumferential direction of the opening. The fall prevention device for an underground structure according to claim 1, wherein the fall prevention device has a shape. 本体を開口部の内側に取り付けた状態において、開口部の内方にて作業が可能な照度を得るために、明かり取りとなる透孔を多数形成した構成を有している請求項1記載の地下構造物用転落防止装置。 2. The structure according to claim 1, wherein in a state where the main body is attached to the inside of the opening, in order to obtain an illuminance capable of working inside the opening, a plurality of through-holes to be lighted are formed. Fall prevention device for underground structures. 透孔は覆い部に形成されており、開口部より深さ2メートルの地点における照度が少なくとも300ルクスとなるように、全ての透孔の合計面積を設定した請求項3記載の地下構造物用転落防止装置。 4. The underground structure according to claim 3, wherein a total area of all the through holes is set so that the through holes are formed in the cover portion, and the illuminance at a point 2 meters deep from the opening is at least 300 lux. Fall prevention device. 本体を、開口部の内方から取り外すことを可能にするために、手でつかむための取っ手
を、本体を貫通して設けている請求項1記載の地下構造物用転落防止装置。
2. The fall prevention device for an underground structure according to claim 1, wherein a handle for grasping by a hand is provided so as to penetrate the main body so that the main body can be removed from the inside of the opening.
本体の覆い部又はその他の箇所に、開口部の存在を知らせるための反射板を設けている請求項1記載の地下構造物用転落防止装置。 2. The fall prevention device for an underground structure according to claim 1, wherein a reflecting plate for notifying the presence of the opening is provided in a cover part or other part of the main body. 本体の覆い部の明かり取りとなる透孔の一部又は全部を閉塞するために、透孔に組み付け可能な閉塞栓を有している請求項1記載の地下構造物用転落防止装置。

2. The fall prevention device for an underground structure according to claim 1, further comprising a blocking plug that can be assembled to the through hole in order to block a part or all of the through hole that serves as a light for the cover portion of the main body.

JP2005075989A 2005-03-16 2005-03-16 Fall prevention device for underground structure Pending JP2006257733A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005075989A JP2006257733A (en) 2005-03-16 2005-03-16 Fall prevention device for underground structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005075989A JP2006257733A (en) 2005-03-16 2005-03-16 Fall prevention device for underground structure

Publications (1)

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JP2006257733A true JP2006257733A (en) 2006-09-28

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JP2005075989A Pending JP2006257733A (en) 2005-03-16 2005-03-16 Fall prevention device for underground structure

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112854304A (en) * 2021-01-14 2021-05-28 张涛 Municipal administration road is with preventing weighing down formula inspection shaft lid

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112854304A (en) * 2021-01-14 2021-05-28 张涛 Municipal administration road is with preventing weighing down formula inspection shaft lid

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