JP7205939B2 - Lid receiving frame set for underground structures - Google Patents

Lid receiving frame set for underground structures Download PDF

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JP7205939B2
JP7205939B2 JP2021167823A JP2021167823A JP7205939B2 JP 7205939 B2 JP7205939 B2 JP 7205939B2 JP 2021167823 A JP2021167823 A JP 2021167823A JP 2021167823 A JP2021167823 A JP 2021167823A JP 7205939 B2 JP7205939 B2 JP 7205939B2
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receiving frame
lid
claw
lid body
opening
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JP2022003215A (en
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豊明 大波
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Aquaintec Corp
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Description

本発明は、地下構造物につながる開口を画定する受枠と、開口を塞ぐ蓋体とを備えた地下構造物用蓋受枠セットに関する。 TECHNICAL FIELD The present invention relates to an underground structure lid receiving frame set including a receiving frame defining an opening connected to an underground structure and a lid body closing the opening.

下水道や上水道、あるいは電力、ガス、通信等における地下埋設物や地下施設等の地下構造物が地上につながる箇所には、地下構造物につながる開口を画定する受枠と、開口を塞ぐ蓋体とを備えた地下構造物用蓋受枠セットが設置される場合がある。本明細書では、蓋体の蓋本体が受枠に支持され開口が塞がれた状態(蓋本体が受枠に嵌め込まれた状態)を閉蓋状態と称し、この閉蓋状態から蓋本体が開くことを開蓋と称することがある。また、地下構造物用蓋受枠セットを、蓋受枠セットと略称する場合がある。 In places where underground structures such as sewerage, water supply, electric power, gas, telecommunications, etc., are connected to the ground, receive frames that define openings leading to underground structures and lids that close the openings are installed. An underground structure lid receiving frame set may be installed. In this specification, the state in which the lid main body of the lid is supported by the receiving frame and the opening is closed (the state in which the lid main body is fitted in the receiving frame) is referred to as a closed state. is sometimes called an open lid. Moreover, the lid receiving frame set for underground structures may be abbreviated as a lid receiving frame set.

蓋受枠セットには、受枠に対して蓋本体を開閉可能に連結する蝶番構造と、不法投棄や不法侵入の防止、さらには、地下構造物内の圧力による開蓋を防止するための施錠構造とを備えたものが知られている。なお、本明細書では、地下構造物内の圧力を、内圧と称することがある。この施錠構造は、蓋本体に設けられた錠部材と、受枠に設けられた爪受け部とからなるものが一般的である(例えば、特許文献1~3等参照)。錠部材は、錠本体と、蓋本体に対して錠本体を揺動可能に支持する軸部と、錠本体と一体に設けられた爪部とを有し、爪部が受枠の爪受け部に係合した係合状態になると開蓋が阻止される。また、蓋本体に形成された鍵穴から、T字型あるいはフック型の開閉工具を挿入し、爪部が爪受け部に係合しない状態に錠部材を揺動させることで開蓋が可能になる。なお、特許文献1記載の蓋受枠セットは、鍵穴を閉塞する弁体が錠部材に設けられたものである。特許文献2記載の蓋受枠セットは、錠部材とは別に、蓋本体に揺動自在に設けられた規制部材を有し、この規制部材に弁体が設けられている。この蓋受枠セットでは、弁体を開閉工具で押えて規制部材を揺動させると、揺動した規制部材に押されて錠部材が揺動する。また、特許文献3記載の蓋受枠セットは、弁体を有する規制部材と錠部材とを備え、鍵穴から挿入された開閉工具によって、規制部材と錠部材とがそれぞれ独立して揺動するものである。 The lid receiving frame set includes a hinge structure that connects the lid body to the receiving frame so that it can be opened and closed, and a locking structure that prevents illegal dumping and illegal entry, as well as preventing the lid from opening due to the pressure inside the underground structure. are known. In addition, in this specification, the pressure in an underground structure may be called an internal pressure. This locking structure generally consists of a lock member provided on the lid body and a pawl receiving portion provided on the receiving frame (see, for example, Patent Documents 1 to 3, etc.). The lock member has a lock body, a shaft portion for swingably supporting the lock body with respect to the lid body, and a claw portion provided integrally with the lock body. Opening of the lid is blocked when the engaged engagement state is reached. Also, the lid can be opened by inserting a T-shaped or hook-shaped opening/closing tool through the keyhole formed in the lid body and rocking the lock member in a state where the claw portion does not engage the claw receiving portion. . Note that the lid receiving frame set described in Patent Document 1 has a lock member provided with a valve body that closes a keyhole. The lid receiving frame set described in Patent Document 2 has a regulating member that is swingably provided on the lid body separately from the lock member, and the regulating member is provided with a valve body. In this lid receiving frame set, when the valve body is pressed by the opening/closing tool and the regulating member is oscillated, the lock member is oscillated by being pushed by the oscillating regulating member. Further, the lid receiving frame set described in Patent Document 3 includes a regulating member having a valve body and a lock member, and the regulating member and the lock member swing independently by an opening/closing tool inserted through a keyhole. be.

また、これらの蓋受枠セットは、集中豪雨などにより内水氾濫を起こして内圧が高まると、受枠に対して蓋本体が所定高さ浮上して爪部と爪受け部とが係合する係合状態になり、蓋本体と受枠との隙間から内圧を解放する。それでも内圧が高まっていくと、下水道管等が破損する前に錠部材の軸部等が破断して蓋本体から錠部材が分離し、これによって開蓋されて内圧を解放する。こうすることで、下水道管等の破損を防ぐと共に、蝶番構造が破壊されて蓋体が飛散してしまうことや、受枠を地下構造物に固定するボルト等が破断して受枠ごと蓋受枠セットが飛散してしまうことも防止している。しかしながら、ゲリラ豪雨とも言われる近年の集中豪雨による内圧は凄まじく、蓋本体から分離した錠部材の飛散や地下構造物への落下が問題となる。このため、錠部材全体の飛散等の防止を目的とした蓋受枠セットが提案されている(例えば、特許文献4等参照)。 In addition, in these lid receiving frame sets, when the internal pressure increases due to flooding of internal water due to torrential rain or the like, the lid main body rises to a predetermined height relative to the receiving frame, and the claw portion engages with the claw receiving portion. state, and the internal pressure is released from the gap between the lid body and the receiving frame. If the internal pressure still increases, the shaft of the lock member breaks and the lock member separates from the lid body before the sewage pipe or the like is damaged, thereby opening the lid and releasing the internal pressure. By doing so, it is possible to prevent damage to sewage pipes, etc., and also prevent the cover from scattering due to the destruction of the hinge structure, and break the bolts, etc. that fix the receiving frame to the underground structure, and the lid receiving frame set together with the receiving frame will be broken. It also prevents them from scattering. However, recent torrential downpours, also known as guerrilla downpours, have created tremendous internal pressure, causing problems such as scattering of the lock member separated from the lid body and falling onto underground structures. For this reason, a lid receiving frame set has been proposed for the purpose of preventing the entire lock member from being scattered (see, for example, Patent Document 4, etc.).

特許文献4記載の蓋受枠セットは、その錠部材が、錠本体とは別体に形成された爪部と、この爪部を錠本体に固定する固定ピンとを有している。固定ピンは、外周に切欠が形成され、内圧が高まって蓋本体が受枠に対して浮上した係合状態で、さらに内圧が高まると、固定ピンが切欠の位置で破断して係合状態が解除される。これにより開蓋されて内圧を解放する。この蓋受枠セットによれば、爪部、固定ピンおよび固定ピンを錠本体に取り付けるボルト等が飛散または落下し、錠部材全体の飛散や落下を防止することができる。 In the lid receiving frame set described in Patent Document 4, the lock member has a claw portion formed separately from the lock body and a fixing pin for fixing the claw portion to the lock body. The fixing pin has a notch formed on the outer periphery, and when the internal pressure increases and the lid body floats against the receiving frame, the fixing pin breaks at the notch position and the engagement state is released when the internal pressure further increases. be done. This opens the lid to release the internal pressure. According to this lid receiving frame set, it is possible to prevent the claw portion, the fixing pin, and the bolt that attaches the fixing pin to the lock body from scattering or falling, thereby preventing the entire lock member from scattering or falling.

特開2003-239308号公報Japanese Patent Application Laid-Open No. 2003-239308 実開昭63-45857号公報Japanese Utility Model Laid-Open No. 63-45857 特開平2-183019号公報JP-A-2-183019 特開2016-205123号公報JP 2016-205123 A

本発明は前記事情に鑑み、弁体が受枠の内周面に引っかかってしまうことなく、規制部材を揺動させることができる工夫がなされた地下構造物用蓋受枠セットを提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide an underground structure cover receiving frame set which is devised to allow a regulating member to swing without the valve body being caught on the inner peripheral surface of the receiving frame. do.

前記目的を解決する本発明の地下構造物用蓋受枠セットは、地下構造物につながる開口を画定する受枠と、該開口を塞ぐ蓋体とを備えた地下構造物用蓋受枠セットにおいて、
前記蓋体は、前記受枠の内周面に支持され周縁部に鍵穴が設けられた蓋本体と、該蓋本体に設けられた錠部材と、該蓋本体に設けられた規制部材とを有するものであり、
前記受枠は、前記内周面よりも下方位置に一体に設けられた爪受け部を有するものであり、
前記規制部材は、前記鍵穴を閉塞する弁体と、前記蓋本体に揺動可能に支持される軸とを有し、該弁体が該鍵穴を閉塞する方向に付勢されたものであり、
前記錠部材は、錠本体と、前記蓋本体に対して該錠本体を揺動可能に支持する軸部と、
該錠本体と一体に設けられた爪部とを有し、該爪部が前記爪受け部に係合して前記開口の開放を阻止する一方、該爪部が該爪受け部に係合しない状態に揺動させると該開口の開放を許容するものであり、
前記規制部材を前記弁体が前記鍵穴を閉塞する状態から開放する方向に揺動させると、該弁体が該鍵穴を閉塞する方向への付勢力に抗して該弁体の先端が前記受枠の内周面に接触し、前記軸が該内周面から離れる方向に移動するものであることを特徴とする。
A lid receiving frame set for an underground structure of the present invention for solving the above-mentioned objects is a lid receiving frame set for an underground structure comprising a receiving frame defining an opening leading to an underground structure and a lid body closing the opening,
The lid body has a lid body supported by the inner peripheral surface of the receiving frame and provided with a keyhole on the peripheral edge, a lock member provided on the lid body, and a regulating member provided on the lid body. and
The receiving frame has a claw receiving portion integrally provided at a position below the inner peripheral surface,
The regulating member has a valve body that closes the keyhole and a shaft that is swingably supported by the lid body, and the valve body is urged in a direction to close the keyhole,
The lock member includes a lock body, a shaft supporting the lock body with respect to the lid body so as to be able to swing,
It has a pawl integrally provided with the lock body, and the pawl engages with the pawl receiving portion to prevent opening of the opening, while the pawl does not engage with the pawl receiving portion. allowing the opening to open when rocked to the state,
When the regulating member is swung in a direction in which the valve body closes the keyhole in a direction in which the valve body opens the keyhole, the tip of the valve body moves against the urging force in the direction in which the valve body closes the keyhole. and the shaft moves in a direction away from the inner peripheral surface.

また、本発明の地下構造物用蓋受枠セットにおいて、前記蓋本体は、水平方向に延在した支持溝を有するものであり、
前記軸は、前記支持溝に支持されたものであってもよい。
Further, in the lid receiving frame set for an underground structure of the present invention, the lid body has a support groove extending in a horizontal direction,
The shaft may be supported in the support groove.

本発明によれば、弁体が受枠の内周面に引っかかってしまうことなく、規制部材を揺動させることができる工夫がなされた地下構造物用蓋受枠セットを提供することができる。 According to the present invention, it is possible to provide an underground structure cover receiving frame set which is devised to allow the regulating member to swing without the valve body being caught on the inner peripheral surface of the receiving frame.

本発明の一実施形態である地下構造物用蓋受枠セットの断面図である。1 is a cross-sectional view of a lid receiving frame set for an underground structure according to an embodiment of the present invention; FIG. 図1に示す錠部材を示す図である。Figure 2 shows a lock member shown in Figure 1; 図1に示す規制部材を示す図である。It is a figure which shows the control member shown in FIG. 図1に示す受枠における、爪受け部が設けられた一端側部分を示す図である。1. It is a figure which shows the one end side part in which the nail|claw receiving part was provided in the receiving frame shown in FIG. (a)は、内圧が所定以上に高まって図1に示す蓋体が持ち上がった様子を示す断面図であり、(b)は、(a)の円で囲んだB部における、爪部と爪受け部との係合状態を拡大して示す図である。(a) is a cross-sectional view showing a state in which the lid shown in FIG. 1 is lifted due to an increase in internal pressure above a predetermined level; It is a figure which expands and shows the engagement state with a receiving part. 変形例における、爪部と爪受け部とが係合する様子を示す図である。It is a figure which shows a mode that the nail|claw part and a nail|claw receiving part are engaged in a modification. 図1に示す地下構造物用蓋受枠セットにおける一端側部分を拡大して示す図である。1. It is a figure which expands and shows the one end side part in the lid receiving frame set for underground structures shown in FIG.

以下、図面を参照して本発明の実施の形態を説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図1は、本発明の一実施形態である蓋受枠セット(地下構造物用蓋受枠セット)の断面図である。この図1では、地面Gを示しているが、図面を簡略化するため、他の図面では地面Gを省略する場合がある。 FIG. 1 is a cross-sectional view of a lid receiving frame set (underground structure lid receiving frame set) that is an embodiment of the present invention. Although FIG. 1 shows the ground G, the ground G may be omitted in other drawings for simplification of the drawing.

図1には、円盤状の蓋本体4を有する蓋体2と、その蓋体2を支持する筒状の受枠3とを備えた蓋受枠セット10を、蓋本体4の中心を通る直線で断面した様子が示されている。以下の説明では、図1の断面図を基準に、左右方向を径方向と称し、左側を一端側と称し、右側を他端側と称して説明する。地下埋設物である下水道用排水管は地表から所定の深さの位置に埋設されており、その下水道用排水管の途中に、地下施設として、マンホールが設けられている。下水道用排水管もマンホールも地下構造物に相当する。マンホールは、既製のコンクリート成型品を積み上げた躯体によって、下水道用排水管から地表へ向かう縦穴として形成されている。受枠3は、その躯体の上に設けられたものであり、地下構造物であるマンホールにつながる開口を内周面31によって画定している。 FIG. 1 shows a cross section of a lid receiving frame set 10 including a lid body 2 having a disk-shaped lid body 4 and a cylindrical receiving frame 3 for supporting the lid body 2 along a straight line passing through the center of the lid body 4. is shown. In the following description, the left-right direction is referred to as the radial direction, the left side is referred to as the one end side, and the right side is referred to as the other end side, with reference to the cross-sectional view of FIG. A sewer drain pipe, which is an underground facility, is buried at a predetermined depth from the ground surface, and a manhole is provided as an underground facility in the middle of the sewer drain pipe. Both sewage pipes and manholes are equivalent to underground structures. A manhole is a vertical hole that leads from a sewer drain pipe to the surface of the ground, using a framework made by stacking ready-made concrete moldings. The receiving frame 3 is provided on the frame, and an inner peripheral surface 31 defines an opening leading to a manhole which is an underground structure.

蓋体2は、蓋本体4の他に、錠部材5と、規制部材6と、蝶番部材7とを有するものである。蓋本体4は、受枠3の内周面31に支持されて開口を開閉自在に塞ぐものであり、図1に示す蓋体2は、蓋本体4が受枠3に嵌合することで開口を塞いでいる(閉蓋状態)。蓋本体4は、鋳鉄製のものであり、その下面に補強用のリブ41が設けられている。なお、蓋本体4は、鋳鉄以外の鉄製であってもよく、鉄以外の金属、樹脂もしくはコンクリート製であってもよい。また、蓋本体4の一端側の周縁部には、開閉工具を挿入するための鍵穴4aが設けられている。 The lid body 2 has a lock member 5 , a regulation member 6 and a hinge member 7 in addition to the lid body 4 . The lid body 4 is supported by the inner peripheral surface 31 of the receiving frame 3 to open and close the opening. The lid body 2 shown in FIG. (closed state). The lid body 4 is made of cast iron, and is provided with ribs 41 for reinforcement on its lower surface. The lid body 4 may be made of iron other than cast iron, or may be made of metal other than iron, resin, or concrete. A keyhole 4a for inserting an opening/closing tool is provided in the peripheral portion of one end side of the lid body 4. As shown in FIG.

図1に示すように、蝶番部材7は、蓋本体4の下面における他端側の周縁部に軸73によって回動自在に連結されている。この蝶番部材7は、その中間部分に形成された鉤状突起71と、その下端部分に形成された抜止突起72とを備えている。また、受枠3の他端側における、内周面31の下方位置には、蝶番座33が設けられている。この蝶番座33には、蝶番部材7が上下方向に貫通する貫通孔331と、被係合部332とが設けられている。これら蝶番部材7と蝶番座33とによって蝶番構造が構成され、蓋本体4を360度旋回あるいは180度転回させることができる。また、内圧(マンホール内の圧力)が所定以上に高くなると蓋体2が持ち上がり、閉蓋状態から蓋本体4が浮上するとともに、詳しくは後述するように爪部53が爪受け部32に係合し、蝶番部材7の鉤状突起71が蝶番座33の被係合部332に係合する。なお、抜止突起72は、蓋体2を持ち上げると蝶番座33に当接する部分であり、抜止突起72が蝶番座33に当接するまで蓋体2を持ち上げると、蓋本体4を垂直反転させることができる。 As shown in FIG. 1, the hinge member 7 is rotatably connected by a shaft 73 to the peripheral portion of the lower surface of the lid body 4 on the other end side. The hinge member 7 has a hook-shaped projection 71 formed in its middle portion and a retaining projection 72 formed in its lower end portion. A hinge seat 33 is provided below the inner peripheral surface 31 on the other end side of the receiving frame 3 . The hinge seat 33 is provided with a through hole 331 through which the hinge member 7 penetrates in the vertical direction, and an engaged portion 332 . A hinge structure is formed by the hinge member 7 and the hinge seat 33, and the lid body 4 can be turned 360 degrees or 180 degrees. When the internal pressure (the pressure inside the manhole) becomes higher than a predetermined value, the lid body 2 is lifted, and the lid main body 4 rises from the closed state, and the claw portions 53 are engaged with the claw receiving portions 32 as will be described later in detail. Then, the hook-shaped projection 71 of the hinge member 7 engages with the engaged portion 332 of the hinge seat 33 . The retaining projection 72 is a portion that abuts on the hinge seat 33 when the lid body 2 is lifted. When the lid body 2 is lifted until the retaining projection 72 abuts on the hinge seat 33, the lid body 4 can be vertically inverted. can.

錠部材5と規制部材6は、蓋本体4の下面における一端側の周縁部に設けられている。また、受枠3の一端側における、内周面31の下方位置には、爪受け部32が設けられている。この爪受け部32は、図1の断面では斜め下方に突き出た部分であり、詳しくは後述する。 The lock member 5 and the regulating member 6 are provided on the lower surface of the lid body 4 at the peripheral portion on the one end side. A claw receiving portion 32 is provided at a position below the inner peripheral surface 31 on one end side of the receiving frame 3 . The claw receiving portion 32 is a portion projecting obliquely downward in the cross section of FIG. 1, and will be described later in detail.

図2は、図1に示す錠部材を示す図である。図2(b)は、図1の錠部材5を拡大して示す右側面図であり、図2(a)は、図1の錠部材5を一端側から見た正面図である。なお、図2(a)における左右方向が、錠部材5の幅方向になる。 2 is a view showing the lock member shown in FIG. 1; FIG. 2(b) is an enlarged right side view of the lock member 5 of FIG. 1, and FIG. 2(a) is a front view of the lock member 5 of FIG. 1 as seen from one end side. 2(a) is the width direction of the lock member 5. As shown in FIG.

図2に示すように、錠部材5は、錠本体51と、一対の軸部52,52と、爪部53と、一対のガイド部54,54とを有し、これらが一体に形成された鋳鉄製のものである。図2(a)に示すように、錠本体51は、幅方向両側に立設した一対の支柱部511,511と、一対の支柱部511,511を下端側で連結する基部512とを有する、正面視略U字状あるいは略コ字状のものである。基部512は、一対の支柱部511,511よりも幅方向に拡がっている部分が設けられており、この部分は錘の役目を有している。一対の支柱部511,511の上端部分には、幅方向における外側に突出した軸部52がそれぞれ設けられ、これら一対の軸部52,52によって、錠本体51が揺動可能に蓋本体4に支持されている。 As shown in FIG. 2, the lock member 5 has a lock body 51, a pair of shaft portions 52, 52, a claw portion 53, and a pair of guide portions 54, 54, which are integrally formed. It is made of cast iron. As shown in FIG. 2( a ), the lock body 51 has a pair of supporting columns 511 , 511 erected on both sides in the width direction, and a base 512 connecting the pair of supporting columns 511 , 511 on the lower end side. It is substantially U-shaped or substantially U-shaped when viewed from the front. The base portion 512 has a portion that is wider in the width direction than the pair of support portions 511, 511, and this portion functions as a weight. Shaft portions 52 protruding outward in the width direction are provided at the upper end portions of the pair of strut portions 511, 511, respectively. Supported.

図2(b)に示すように、爪部53は、基部512における径方向の外側(図では左側)の面から斜め上方に突き出た部分であり、錠本体51側の根元53bから先端53aに向かうにつれて肉厚が薄くなるように形成されている。また、図2(a)に示すように、爪部53は、錠部材5における幅方向の中央部分に配置されている。一対のガイド部54,54は三角形状の突起であり、図2(a)に示すように、爪部53を挟んだ幅方向の両側に設けられている。一対のガイド部54,54それぞれの上面には、径方向の外側に向けて斜め下方に傾斜した傾斜面54aが形成されている。内圧が所定以上に高くなると蓋体2が持ち上がり、閉蓋状態から蓋本体4が浮上するとともに、前述したように蝶番部材7の鉤状突起71が蝶番座33の被係合部332に係合し、ガイド部54の傾斜面54aにガイドされつつ、爪部53が、図1に示す爪受け部32に係合する。 As shown in FIG. 2(b), the pawl portion 53 is a portion projecting obliquely upward from the radially outer (left side in the figure) surface of the base portion 512, extending from a root 53b on the side of the lock body 51 to a tip 53a. It is formed so that the thickness becomes thinner as it goes. Further, as shown in FIG. 2(a), the claw portion 53 is arranged at the central portion of the lock member 5 in the width direction. The pair of guide portions 54, 54 are triangular projections, and are provided on both sides of the claw portion 53 in the width direction, as shown in FIG. 2(a). An upper surface of each of the pair of guide portions 54, 54 is formed with an inclined surface 54a that is inclined downward toward the outside in the radial direction. When the internal pressure rises above a predetermined level, the lid body 2 is lifted and the lid body 4 rises from the closed state, and the hook-shaped projection 71 of the hinge member 7 engages the engaged portion 332 of the hinge seat 33 as described above. Then, while being guided by the inclined surface 54a of the guide portion 54, the claw portion 53 is engaged with the claw receiving portion 32 shown in FIG.

図3は、図1に示す規制部材を示す図である。図1では、規制部材6の一部が錠部材5に隠れているが、図3(b)は、図1の規制部材6を抜き出して拡大して示す右側面図であり、図3(a)は、図1の規制部材6を一端側から見た正面図である。 FIG. 3 is a diagram showing a restricting member shown in FIG. 1. FIG. In FIG. 1, part of the regulating member 6 is hidden by the lock member 5, but FIG. 3(b) is a right side view showing the regulating member 6 of FIG. ) is a front view of the restricting member 6 of FIG. 1 as seen from one end side.

図1および図3に示すように、規制部材6は、蓋本体4の鍵穴4aを閉塞する弁体61を有しており、図3(b)に示す挿通孔62aに挿通された、図1に示す軸ピン62によって、規制部材6が揺動可能に蓋本体4に支持されている。また、規制部材6は、下端側部部の幅方向両側それぞれに錘部63を有している。これら一対の錘部63,63と、図1に示すトーションばね64とによって、規制部材6は、その弁体61が鍵穴4aを閉塞する方向に付勢されている。また、図1に示すように、規制部材6は、一対の錘部63,63が、錠本体51の右側(径方向における内側)の面に当接し、錠部材5の反時計回りの揺動を規制している。 As shown in FIGS. 1 and 3, the regulating member 6 has a valve body 61 that closes the keyhole 4a of the lid body 4, and is inserted through the insertion hole 62a shown in FIG. 1, the regulating member 6 is swingably supported by the lid body 4 by means of the shaft pin 62 shown in FIG. Further, the restricting member 6 has a weight portion 63 on each side in the width direction of the lower end side portion. The pair of weights 63, 63 and the torsion spring 64 shown in FIG. 1 urge the restricting member 6 in the direction in which the valve body 61 closes the keyhole 4a. As shown in FIG. 1, the pair of weights 63, 63 of the regulating member 6 abut on the right side (inner side in the radial direction) of the lock body 51, and the lock member 5 swings counterclockwise. is regulated.

図4は、図1に示す受枠における、爪受け部が設けられた一端側部分を示す図である。具体的には、図4(a)は、受枠3の一端側部分を上方から見た平面図である。図4(b)は、受枠3の一端側部分を、径方向における内側から見た図であり、同図(a)を図の下方から見た図に相当する。図4(c)は、同図(b)のA-A線断面図であり、同図(d)は、受枠3の一端側部分を下方から見た底面図である。 FIG. 4 is a view showing one end side portion of the receiving frame shown in FIG. 1 where the claw receiving portion is provided. Specifically, FIG. 4A is a plan view of one end side portion of the receiving frame 3 as viewed from above. FIG. 4(b) is a view of one end portion of the receiving frame 3 viewed from the inside in the radial direction, and corresponds to a view of FIG. 4(a) viewed from below. FIG. 4(c) is a cross-sectional view taken along the line AA of FIG. 4(b), and FIG. 4(d) is a bottom view of one end portion of the receiving frame 3 viewed from below.

図4に示すように、爪受け部32は、袋状(ドーム状)に形成されている。これにより、詳しくは後述するように、蓋体2が持ち上がると爪部53が挿入される空間S(図4(c)参照)が爪受け部32によって画定されている。 As shown in FIG. 4, the claw receiving portion 32 is formed in a bag shape (dome shape). Thereby, as will be described later in detail, the claw receiving portion 32 defines a space S (see FIG. 4C) into which the claw portion 53 is inserted when the lid body 2 is lifted.

図1に示す状態で開蓋しようとしても、爪部53が爪受け部32に係合し、開蓋が阻止される。開蓋するには、まず、不図示のT字型の開閉工具を用い、弁体61を押えて規制部材6を反時計回りに揺動させ、開閉工具の先端を鍵穴4aから挿入する。次いで、鍵穴4aから挿入した開閉工具の先端によって、錠部材5を、その爪部53が爪受け部32に係合しない姿勢に揺動させることで開蓋が可能になる。すなわち、本実施形態の蓋受枠セット10は、前述した特許文献3記載の蓋受枠セットと同様に、鍵穴4aから挿入された開閉工具によって、規制部材6と錠部材5とがそれぞれ独立して揺動するものである。図7は、図1に示す地下構造物用蓋受枠セットにおける一端側部分を拡大して示す図である。図7に示すように、蓋本体4には、規制部材6の軸ピン62を支持する支持溝4bが形成されている。この支持溝4bは水平方向に延在したものである。なお、支持溝4bのうち、規制部材6によって隠れた部分は破線で示している。開閉工具を用い、弁体61を押えて規制部材6を反時計回りに揺動させると、弁体61の先端が受枠3の内周面31に接触し、トーションばね64の付勢力に抗して軸ピン62が他端側に移動する。これにより、弁体61が受枠3の内周面31に引っかかってしまうことなく、規制部材6を揺動させることができる。 Even if an attempt is made to open the lid in the state shown in FIG. 1, the pawl portion 53 engages the pawl receiving portion 32 and the opening of the lid is prevented. To open the lid, first, a T-shaped opening/closing tool (not shown) is used to press the valve body 61 to swing the restricting member 6 counterclockwise, and the tip of the opening/closing tool is inserted through the keyhole 4a. Next, the tip of the opening/closing tool inserted through the keyhole 4a swings the lock member 5 so that the claw portion 53 does not engage with the claw receiving portion 32, thereby opening the lid. That is, in the lid receiving frame set 10 of the present embodiment, similarly to the lid receiving frame set described in Patent Document 3, the restricting member 6 and the lock member 5 are independently rocked by an opening/closing tool inserted through the keyhole 4a. It moves. 7 is an enlarged view of one end portion of the lid receiving frame set for underground structure shown in FIG. 1. FIG. As shown in FIG. 7, the lid body 4 is formed with a support groove 4b for supporting the shaft pin 62 of the regulating member 6. As shown in FIG. The support groove 4b extends horizontally. A portion of the support groove 4b that is hidden by the regulating member 6 is indicated by a broken line. When the opening/closing tool is used to press the valve body 61 to swing the restricting member 6 counterclockwise, the tip of the valve body 61 comes into contact with the inner peripheral surface 31 of the receiving frame 3 and resists the biasing force of the torsion spring 64 . As a result, the shaft pin 62 moves to the other end side. Thereby, the regulation member 6 can be swung without the valve body 61 being caught on the inner peripheral surface 31 of the receiving frame 3 .

図5(a)は、内圧が所定以上に高まって図1に示す蓋体が持ち上がった様子を示す断面図である。 FIG. 5(a) is a cross-sectional view showing a state in which the lid shown in FIG. 1 is lifted due to an increase in internal pressure above a predetermined level.

集中豪雨等によって内圧が所定以上に高まると、図5(a)に示すように、蓋体2が持ち上がる。具体的には、蓋本体4が高さh分浮上し、蝶番部材7の鉤状突起71が蝶番座33の被係合部332に係合するとともに、爪部53が空間S(図4(c)参照)に挿入されて爪受け部32に係合した係合状態になる。これにより、蓋本体4と受枠3との隙間から内圧を解放する。 When the internal pressure rises above a predetermined level due to torrential rain or the like, the lid body 2 is lifted as shown in FIG. 5(a). Specifically, the lid body 4 floats by a height h, the hook-shaped projection 71 of the hinge member 7 engages with the engaged portion 332 of the hinge seat 33, and the claw portion 53 moves into the space S (see FIG. 4 ( c)) and is in an engaged state in which it is engaged with the pawl receiving portion 32 . As a result, the internal pressure is released from the gap between the lid body 4 and the receiving frame 3 .

図5(b)は、同図(a)の円で囲んだB部における、爪部と爪受け部との係合状態を拡大して示す図である。なお、図5(b)では、図面を簡略化するため、錠部材5と受枠3のみを示すと共に、受枠3については端面を示している。 FIG. 5(b) is an enlarged view showing the state of engagement between the pawl portion and the pawl receiving portion in the circled portion B in FIG. 5(a). In addition, in FIG. 5(b), in order to simplify the drawing, only the lock member 5 and the receiving frame 3 are shown, and the end face of the receiving frame 3 is shown.

図5(b)に示すように、係合状態における爪部53は、空間S(図4(c)参照)に挿入され、ガイド部54の傾斜面54aにガイドされた状態で爪受け部32と係合している。なお、図5(b)に示す係合状態では、爪受け部32がガイド部54にも接触しているが、内圧の状況等によっては、係合状態において、爪受け部32がガイド部54から離間する場合もある。また、図5(b)では、係合状態において錠部材5が揺動していないが、錠部材5が反時計回りに揺動した姿勢で爪部53が爪受け部32に係合する場合もある。 As shown in FIG. 5(b), the claw portion 53 in the engaged state is inserted into the space S (see FIG. 4(c)) and guided by the inclined surface 54a of the guide portion 54. engaged with. In the engaged state shown in FIG. 5(b), the pawl receiving portion 32 is also in contact with the guide portion 54. may be separated from In FIG. 5B, the lock member 5 does not swing in the engaged state, but the claw portion 53 engages the claw receiving portion 32 while the lock member 5 swings counterclockwise. There is also

本実施形態では、爪部53と爪受け部32とは、紙面と直交する水平方向(図2および図3に示す幅方向)に沿った線状または面状に接触している。爪受け部32が接触する、爪部53側の接触部位Tの肉厚L1は、爪部53が接触する、爪受け部32側の接触部位T’の肉厚L2よりも薄いものである。ここでいう肉厚とは、水平方向に沿った接触部位T,T’に対して、鉛直面内において交差する方向の厚さをいう。 In this embodiment, the claw portion 53 and the claw receiving portion 32 are in linear or planar contact along the horizontal direction (the width direction shown in FIGS. 2 and 3) orthogonal to the paper surface. The thickness L1 of the contact portion T on the side of the claw portion 53 with which the claw receiving portion 32 contacts is thinner than the thickness L2 of the contact portion T' on the side of the claw receiving portion 32 with which the claw portion 53 contacts. The thickness here refers to the thickness in the direction intersecting in the vertical plane with respect to the contact portions T and T' along the horizontal direction.

図5に示す係合状態において、内圧がさらに高まっていくと、爪部53が破断し、係合状態が解除される。ここで、爪部53が破断する箇所は、内圧の状況や、製造での寸法誤差等によって変わってくるが、例えば、図5(b)の二点鎖線で示すような箇所で破断し、その破断した箇所の断面(破断面)を、一点鎖線の円で囲んで示している。 In the engaged state shown in FIG. 5, when the internal pressure further increases, the claw portion 53 breaks and the engaged state is released. Here, the location at which the claw portion 53 is broken varies depending on the state of internal pressure, dimensional errors in manufacturing, and the like. A cross section (fractured surface) of the fractured portion is indicated by enclosing it with a dashed-dotted circle.

本実施形態の爪部53は、いずれの箇所で破断した場合であっても、一点鎖線の円で囲んで示すように、その破断面が、高さHよりも幅L3の方が大きくなるように形成されている。ここで、爪部53の破断における高さと幅の断面二次モーメントの関係において、高さは三乗で力が働くため、幅に比べて高さの方が、製造での寸法誤差から生じる力の値の精度が低い。このため、爪部53における破断面を高さHよりも幅L3の方が大きくすれば、力の精度を高めることができ、これにより、爪部53の強度を所定の範囲内に収めることが容易になる。ここで、爪部53の強度における上下の限界値は、例えば、蓋本体4の受枠3への食い込み力や、蓋本体4の飛散、受枠3ごとの蓋受枠セット10の飛散の防止等の観点から設定される。また、爪部53における、爪受け部32と接触する側や、その反対側に、一点鎖線で示す切欠(ノッチ)531を形成し、爪部53の強度を弱めたり調整する態様を採用してもよい。また、切欠531を形成することで、爪部53が破断する箇所を、所望の位置に設定することも可能になる。なお、錠部材5における爪部53以外の部分、例えば軸部52や支柱部511等は、爪部53が破断する圧力まで内圧が高まっても、破断しない強度に設定されている。 The claw portion 53 of the present embodiment is such that the width L3 of the fractured surface is larger than the height H, as shown by encircling the circle of the dashed-dotted line, even when the claw portion 53 is fractured at any point. is formed in Here, in the relationship between the geometrical moment of inertia of the height and width when the claw portion 53 breaks, since the force acts on the height to the power of three, the force caused by the dimensional error in manufacturing is greater in the height than in the width. The value of is less precise. Therefore, if the width L3 of the fracture surface of the claw portion 53 is larger than the height H, the accuracy of the force can be improved, thereby keeping the strength of the claw portion 53 within a predetermined range. become easier. Here, the upper and lower limit values of the strength of the claw portion 53 are determined, for example, from the viewpoint of the biting force of the lid body 4 into the receiving frame 3, the scattering of the lid body 4, and the prevention of the scattering of the lid receiving frame set 10 for each receiving frame 3. is set from In addition, a notch 531 indicated by a dashed line is formed on the side of the claw portion 53 that contacts the claw receiving portion 32 and on the opposite side to weaken or adjust the strength of the claw portion 53. good too. Further, by forming the notch 531, it is possible to set the location where the claw portion 53 is to be broken at a desired position. Parts of the lock member 5 other than the claw portion 53, such as the shaft portion 52 and the strut portion 511, are set to a strength that does not break even if the internal pressure increases to the pressure at which the claw portion 53 breaks.

爪部53が破断して係合状態が解除されると、内圧によって蝶番部材7が軸73を中心に揺動して鉤状突起71が蝶番座33の被係合部332から外れる。次いで、抜止突起72が蝶番座33に当接するまで蓋体2が持ち上がり蓋本体4が垂直反転する。なお、内圧の状況によっては、蝶番部材7の鉤状突起71が蝶番座33の被係合部332から外れず、蓋本体4は垂直の姿勢まで開蓋した後、反転せずに閉まる方向に戻る場合もある。いずれの場合でも、開蓋(開口が開放)されて、内圧を解放する。これにより、下水道管等の破損や、蝶番構造が破壊されることによる蓋本体4の飛散、受枠3をマンホールに固定するボルト等が破損することによる受枠3ごとの蓋受枠セット10の飛散等が防止される。また、錠部材5の破壊に関して、破断する部分が爪部53に限定され、飛散したり落下したりするものを少なくすることができる。特に、本実施形態の爪部53は、接触部位Tから根元53bに向かうにつれて肉厚が厚くなるように形成されているため、爪部53は、根元53bよりも、接触部位T側、あるいは接触部位T付近、すなわち爪部53の根元53bよりも先端53a側で破断しやすくなり、飛散または落下する破断片を小さくすることができる。 When the claw portion 53 is broken and the engaged state is released, the hinge member 7 swings around the shaft 73 due to the internal pressure, and the hook-shaped projection 71 is disengaged from the engaged portion 332 of the hinge seat 33 . Next, the lid body 2 is lifted until the retaining projection 72 abuts on the hinge seat 33, and the lid body 4 is vertically inverted. Depending on the state of the internal pressure, the hook-shaped projection 71 of the hinge member 7 may not come off from the engaged portion 332 of the hinge seat 33, and after the lid body 4 is opened to the vertical posture, it may be closed without being turned over. I may go back. In either case, the lid is opened (the opening is opened) to release the internal pressure. As a result, damage to the sewage pipes, scattering of the lid body 4 due to destruction of the hinge structure, scattering of the lid receiving frame set 10 for each receiving frame 3 due to damage to the bolts fixing the receiving frame 3 to the manhole, etc. can be prevented. prevented. In addition, regarding the breakage of the lock member 5, the portion to be broken is limited to the pawl portion 53, so that it is possible to reduce the number of items that scatter or fall. In particular, since the claw portion 53 of the present embodiment is formed so that the wall thickness increases from the contact portion T toward the root 53b, the claw portion 53 is closer to the contact portion T than the root 53b, or to the contact portion. The vicinity of the portion T, that is, the tip 53a side of the claw portion 53 rather than the base 53b is likely to break, and the scattered or dropped fragments can be reduced.

さらに、本実施形態では、爪受け部32が、爪部53の先端53a側に接触するように導くガイド部54を設けている。爪受け部32が接触する爪部53の接触部位Tは、係合状態において、爪部53にかかる力の支持点位置になる。このため、接触部位Tが、爪部53の先端53a側になればなるほど、爪部53における、接触部位Tよりも根元53b側の部位に働く力が大きくなり、爪部53が破断しやすくなる。なお、接触部位Tが先端53a側になりすぎると爪受け部32との係合状態が不安定になる場合がある。また、不法投棄や不法侵入を目的に開蓋しようとしても、爪部53が破断しないようにする必要がある。これらの観点から接触部位Tの位置を調整することが望ましい。 Further, in this embodiment, a guide portion 54 is provided to guide the claw receiving portion 32 so as to come into contact with the tip 53a side of the claw portion 53 . A contact portion T of the claw portion 53 with which the claw receiving portion 32 contacts becomes a support point position of the force applied to the claw portion 53 in the engaged state. Therefore, the closer the contact portion T is to the tip 53a side of the claw portion 53, the greater the force acting on the portion of the claw portion 53 closer to the root 53b than the contact portion T, and the more likely the claw portion 53 is to break. . If the contact portion T is too close to the tip 53a, the state of engagement with the claw receiving portion 32 may become unstable. Moreover, even if the lid is opened for the purpose of illegal dumping or illegal entry, it is necessary to prevent the claw portion 53 from breaking. It is desirable to adjust the position of the contact portion T from these points of view.

またさらに、前述したように、本実施形態では、爪受け部32が袋状に形成されており、係合状態では、爪受け部32によって画定された空間S(図4(c)参照)内に爪部53が挿入された状態になる。このため、爪部53が破断した場合に、その破断片の飛散を抑えることができる。 Furthermore, as described above, in this embodiment, the claw receiving portion 32 is formed in a bag shape, and in the engaged state, the space S defined by the claw receiving portion 32 (see FIG. 4(c)). The claw portion 53 is inserted into the state. Therefore, when the claw portion 53 is broken, the broken pieces can be prevented from scattering.

次に、図1~図5に示す蓋受枠のセットの変形例について説明する。以下に説明する変形例においては、図1~図5に示す実施形態との相違点を中心に説明し、図1~図5に示す実施形態における構成要素の名称と同じ名称の構成要素には、これまで用いた符号を付して説明し、重複する説明は省略することがある。 Next, a modification of the lid receiving frame set shown in FIGS. 1 to 5 will be described. In the modifications described below, differences from the embodiment shown in FIGS. 1 to 5 will be mainly described. , will be described with the reference numerals that have been used so far, and overlapping descriptions may be omitted.

図6は、変形例における、爪部と爪受け部とが係合する様子を示す図である。本変形例は、上記実施形態の蓋受枠セットと比べて、ガイド部54の形態が相違するものであり、図6では、図5(b)と同じく、錠部材5と受枠3のみを示している。 FIG. 6 is a diagram showing how the claw portion and the claw receiving portion are engaged with each other in the modified example. This modification differs from the lid receiving frame set of the above embodiment in the form of the guide portion 54, and FIG. 6 shows only the lock member 5 and the receiving frame 3, as in FIG. 5B. there is

図6(a)では、上記実施形態のガイド部54の傾斜面54aを一点鎖線で示しており、本変形例のガイド部54’は、傾斜面54a’が、上記実施形態の傾斜面54aと比べて、径方向の斜め外側に高くなるように形成されている。このため、内圧が高まり、図1に示す閉蓋状態から蓋体2が浮上していくと、ガイド部54’の傾斜面54a’が爪受け部32に接触し、錠部材5が反時計回りに揺動していく。やがて、図6(b)に示すように、ガイド部54’にガイドされて、図5(b)に示す実施形態よりも、爪部53の先端53a側に爪受け部32が接触して係合状態になる。これにより、接触部位Tが、爪部53の先端53a側になり、爪部53が破断しやすくなる。 In FIG. 6A, the inclined surface 54a of the guide portion 54 of the above embodiment is indicated by a dashed line. In comparison, it is formed so as to be higher diagonally outward in the radial direction. Therefore, when the internal pressure increases and the lid body 2 rises from the closed state shown in FIG. swaying to Eventually, as shown in FIG. 6(b), it is guided by the guide portion 54', and the claw receiving portion 32 contacts and engages with the tip 53a side of the claw portion 53 more than in the embodiment shown in FIG. 5(b). be in a congruent state. As a result, the contact portion T is located on the tip 53a side of the claw portion 53, and the claw portion 53 is easily broken.

このように、ガイド部54’は、係合状態において、爪受け部32が接触する、爪部53の接触部位Tを先端側に導くものであり、爪部53にかかる力の支持点位置を爪部53の先端53a側に導くものである。また、ガイド部54’は、係合状態において、爪部53にかかる力の支持点位置を調整するものでもあり、支持点位置を特定するものでもある。 In this manner, the guide portion 54' guides the contact portion T of the claw portion 53, which the claw receiving portion 32 contacts in the engaged state, to the distal end side, and the position of the supporting point of the force applied to the claw portion 53 is determined. It guides to the tip 53 a side of the claw portion 53 . Further, the guide portion 54' adjusts the support point position of the force applied to the claw portion 53 in the engaged state, and also specifies the support point position.

以上説明した蓋受枠セット10によれば、弁体61が受枠3の内周面31に引っかかってしまうことなく、規制部材6を揺動させることができる。 According to the lid receiving frame set 10 described above, the restricting member 6 can be swung without the valve body 61 being caught on the inner peripheral surface 31 of the receiving frame 3 .

本発明は前述した実施形態に限られることなく特許請求の範囲に記載した範囲で種々の変更を行うことができる。例えば、特許文献2記載の蓋受枠セットと同様に、開閉工具によって揺動させた規制部材に押されて錠部材が揺動する態様を採用してもよい。 The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. For example, as in the case of the lid receiving frame set described in Patent Document 2, it is also possible to employ a mode in which the lock member is pushed by the regulating member that is swung by the opening/closing tool to swing.

また、これまで説明した地下構造物用蓋受枠セットは、
地下構造物につながる開口を画定する受枠と、該開口を塞ぐ蓋体とを備えた地下構造物用蓋受枠セットにおいて、
前記蓋体は、前記受枠の内周面に支持され周縁部に鍵穴が設けられた蓋本体と、該蓋本体に設けられた錠部材と、該蓋本体に設けられた規制部材とを有するものであり、
前記受枠は、前記内周面よりも下方位置に一体に設けられた爪受け部を有するものであり、
前記規制部材は、前記鍵穴を閉塞する弁体と、前記蓋本体に揺動可能に支持される軸とを有し、該弁体が該鍵穴を閉塞する方向に付勢されたものであり、
前記錠部材は、錠本体と、前記蓋本体に対して該錠本体を揺動可能に支持する軸部と、
該錠本体と一体に設けられた爪部とを有し、該爪部が前記爪受け部に係合して前記開口の開放を阻止する一方、該爪部が該爪受け部に係合しない状態に揺動させると該開口の開放を許容するものであり、
前記爪受け部に前記爪部が係合した係合状態で前記地下構造物の内圧が高まっていくと、該爪部が破断して該係合状態が解除され、前記開口が開放されるものであることを特徴としてもよい。
In addition, the cover receiving frame set for underground structures described so far is
An underground structure lid receiving frame set comprising a receiving frame defining an opening leading to an underground structure and a lid body closing the opening,
The lid body has a lid body supported by the inner peripheral surface of the receiving frame and provided with a keyhole on the peripheral edge, a lock member provided on the lid body, and a regulating member provided on the lid body. and
The receiving frame has a claw receiving portion integrally provided at a position below the inner peripheral surface,
The regulating member has a valve body that closes the keyhole and a shaft that is swingably supported by the lid body, and the valve body is urged in a direction to close the keyhole,
The lock member includes a lock body, a shaft supporting the lock body with respect to the lid body so as to be able to swing,
It has a pawl integrally provided with the lock body, and the pawl engages with the pawl receiving portion to prevent opening of the opening, while the pawl does not engage with the pawl receiving portion. allowing the opening to open when rocked to the state,
When the internal pressure of the underground structure increases in the engagement state where the claw portion is engaged with the claw receiving portion, the claw portion is broken, the engagement state is released, and the opening is opened. It may be characterized as being

さらに、これまで説明した地下構造物用蓋受枠セットは、地下構造物につながる開口を画定する受枠と、該開口を塞ぐ蓋体とを備えた地下構造物用蓋受枠セットにおいて、
前記蓋体は、前記受枠の内周面に支持され周縁部に鍵穴が設けられた蓋本体と、該蓋本体に設けられた錠部材と、該蓋本体に設けられた規制部材とを有するものであり、
前記受枠は、前記内周面よりも下方位置に一体に設けられた爪受け部を有するものであり、
前記規制部材は、前記鍵穴を閉塞する弁体と、前記蓋本体に揺動可能に支持される軸とを有し、該弁体が該鍵穴を閉塞する方向に付勢されたものであり、
前記錠部材は、錠本体と、前記蓋本体に対して該錠本体を揺動可能に支持する軸部と、該錠本体と一体に設けられた爪部とを有し、該爪部が前記爪受け部に係合して前記開口の開放を阻止する一方、該爪部が該爪受け部に係合しない状態に揺動させると該開口の開放を許容するものであり、
前記爪受け部に前記爪部が係合した係合状態で前記地下構造物の内圧が高まっていくと、該爪部が破断して該係合状態が解除され、前記開口が開放されるものであり、
前記錠部材は、前記係合状態において、前記爪受け部を、前記爪部の先端側に接触するように導くガイド部を有することを特徴とする。
Furthermore, the lid receiving frame set for underground structure described so far is a lid receiving frame set for underground structure comprising a receiving frame defining an opening leading to an underground structure and a lid body closing the opening,
The lid body has a lid body supported by the inner peripheral surface of the receiving frame and provided with a keyhole on the peripheral edge, a lock member provided on the lid body, and a regulating member provided on the lid body. and
The receiving frame has a claw receiving portion integrally provided at a position below the inner peripheral surface,
The regulating member has a valve body that closes the keyhole and a shaft that is swingably supported by the lid body, and the valve body is urged in a direction to close the keyhole,
The lock member has a lock body, a shaft portion for swingably supporting the lock body with respect to the lid body, and a claw portion provided integrally with the lock body. While engaging with the pawl receiving portion to prevent opening of the opening, when the pawl portion is swung in a state in which the pawl portion does not engage with the pawl receiving portion, the opening is allowed to open,
When the internal pressure of the underground structure increases in the engagement state where the claw portion is engaged with the claw receiving portion, the claw portion is broken, the engagement state is released, and the opening is opened. and
The lock member has a guide portion that guides the pawl receiving portion so as to come into contact with the distal end side of the pawl portion in the engaged state.

すなわち、前記爪部は、前記爪受け部よりも強度が弱いものである。ここで、前記爪部は、強度を調整する(強度を低下させる)切込が設けられたものであってもよい。前記切込を設ける態様を採用すれば、前記爪部が破断する箇所が該切込を設けた位置に設定され易い。また、前記地下構造物内の圧力(内圧)が、前記爪部が破断する圧力まで高まっても、前記軸部や前記錠本体は、破断しない強度を有するものである。なお、前記地下構造物用蓋受枠セットは、前記受枠に対して前記蓋体を開閉可能に連結する蝶番構造を有し、前記係合状態において前記爪部が破断して前記係合状態が解除されると、該蓋体が該蝶番構造に連結された状態で垂直反転し、前記開口を開放するものであってもよい。ここで、前記ガイド部は、前記係合状態において、前記爪部にかかる力の支持点位置を調整するものでもあり、該支持点位置を特定するものでもある。 That is, the claw portion is weaker than the claw receiving portion. Here, the claw portion may be provided with a notch for adjusting strength (reducing strength). By adopting a mode in which the cut is provided, the portion where the claw portion is to be broken is easily set at the position where the cut is provided. Further, even if the pressure (internal pressure) in the underground structure rises to the pressure at which the claw portion breaks, the shaft portion and the lock body have the strength not to break. The underground structure lid receiving frame set has a hinge structure that connects the lid body to the receiving frame so that it can be opened and closed. Then, the lid may be vertically inverted while being connected to the hinge structure to open the opening. Here, the guide portion adjusts the support point position of the force applied to the claw portion in the engaged state, and also specifies the support point position.

上記地下構造物用蓋受枠セットによれば、前記係合状態において、さらに内圧が高まっていくと、前記錠本体に一体に設けられた前記爪部が破断して開蓋し前記開口が開放される。このため、前記錠部材の破壊に関して、飛散したり落下したりするものが、破断した前記爪部に限定され、飛散したり落下したりするものを少なくすることができる。さらに、前記爪部は、前記錠本体に一体に設けられたものであるため、例えば鋳造等によって容易に製造でき、かつ部品点数も少ない。なお、前記軸部は、前記錠本体に一体に設けられたものであってもよいし、該錠本体とは別体のピン等で構成してもよい。また、前記係合状態において、前記爪受け部が前記爪部に接触する接触部位、すなわち該爪部にかかる力の支持点位置を該爪部の先端側に導くことができる。この結果、該爪部における、前記錠本体側の部位にかかる力が大きくなり、該爪部が破断しやすくなる。 According to the underground structure lid receiving frame set, when the internal pressure further increases in the engaged state, the claw portion integrally provided with the lock body is broken and the lid is opened to open the opening. be. Therefore, regarding the breakage of the lock member, the items that scatter or fall are limited to the broken pawl portion, and the number of items that scatter or fall can be reduced. Furthermore, since the claw portion is provided integrally with the lock body, it can be easily manufactured by, for example, casting, and the number of parts is small. The shaft portion may be provided integrally with the lock main body, or may be configured by a pin or the like separate from the lock main body. Further, in the engaged state, the contact portion where the claw receiving portion contacts the claw portion, that is, the support point position of the force applied to the claw portion can be guided to the distal end side of the claw portion. As a result, the force applied to the portion of the claw on the side of the lock body increases, and the claw is likely to break.

また、上記地下構造物用蓋受枠セットにおいて、前記爪部は、前記係合状態において、前記爪受け部が接触している接触部位の肉厚が、該爪受け部における、該爪部と接触している接触部位の肉厚よりも薄いものであってもよい。 Further, in the above lid receiving frame set for an underground structure, the thickness of the contact portion with which the claw receiving portion is in contact with the claw portion in the engaged state is such that the claw portion of the claw receiving portion comes into contact with the claw portion. It may be thinner than the thickness of the contact portion where it is.

すなわち、前記接触部位の断面二次モーメントが、前記爪受け部よりも、前記爪部の方が小さいものである。ここでいう肉厚とは、水平方向に沿って線接触または面接触した前記接触部位に対して、鉛直面内において交差する方向の厚さをいう。前記受枠と、前記錠本体および前記爪部とは、同一素材で構成されたもの、例えば、共に鋳鉄製のものであってもよい。なお、前記爪部は、前記接触部位から前記錠本体に向かうにつれて前記肉厚が厚くなるもの、すなわち断面二次モーメントが大きくなるものであってもよい。こうすることで、前記爪部は、根元(前記錠本体側の部位)よりも前記接触部位側、あるいは該接触部位付近、すなわち根元よりも先端側で破断しやすくなり、飛散または落下する破断片を小さくすることができる。 That is, the moment of inertia of area of the contact portion is smaller at the claw portion than at the claw receiving portion. Here, the thickness refers to the thickness in the direction intersecting in the vertical plane with respect to the contact portion that is in line contact or plane contact along the horizontal direction. The receiving frame, the lock body and the claw portion may be made of the same material, for example, cast iron. The pawl portion may have a wall thickness that increases from the contact portion toward the lock body, that is, a geometrical moment of inertia that increases. By doing so, the claw portion is more likely to break on the contact portion side than the root (the portion on the lock body side), or near the contact portion, i.e., on the tip side of the root, and the broken pieces that scatter or fall will be more likely to break. can be made smaller.

さらに、上記地下構造物用蓋受枠セットにおいて、前記爪部は、前記係合状態の後に破断した部位の破断面が、高さよりも幅の方が大きいものであってもよい。 Further, in the above underground structure lid receiving frame set, the claw portion may have a fractured surface with a width larger than a height at a fractured portion after the engagement state.

幅とは、水平方向の寸法をいう。 Width refers to the horizontal dimension.

前記爪部の破断における高さと幅の断面二次モーメントの関係において、高さは三乗で力が働くため、幅に比べて高さの方が、製造での寸法誤差から生じる力の値の精度が低い。このため、前記爪部における前記破断面を、高さよりも幅の方を大きくすれば、力の精度を高めることができる。これにより、前記蓋本体の前記受枠への食い込み力や、前記蓋体や該受枠ごとの前記蓋受枠セットの飛散の防止等の観点から設定された上下の限界値内に前記爪部の強度を収めることが容易になる。
(付記1)他の地下構造物用蓋受枠セットは、地下構造物につながる開口を画定する受枠と、該開口を塞ぐ蓋体とを備えた地下構造物用蓋受枠セットにおいて、
前記蓋体は、前記受枠の内周面に支持され周縁部に鍵穴が設けられた蓋本体と、該蓋本体に設けられた錠部材と、該蓋本体に設けられた規制部材とを有するものであり、
前記受枠は、前記内周面よりも下方位置に一体に設けられた爪受け部を有するものであり、
前記規制部材は、前記鍵穴を閉塞する弁体と、前記蓋本体に揺動可能に支持される軸とを有し、該弁体が該鍵穴を閉塞する方向に付勢されたものであり、
前記錠部材は、錠本体と、前記蓋本体に対して該錠本体を揺動可能に支持する軸部と、
該錠本体と一体に設けられた爪部とを有し、該爪部が前記爪受け部に係合して前記開口の開放を阻止する一方、該爪部が該爪受け部に係合しない状態に揺動させると該開口の開放を許容するものであり、
前記規制部材を前記弁体が前記鍵穴を閉塞する状態から開放する方向に揺動させると、該弁体の先端が前記受枠の内周面に接触し、前記軸が該内周面から離れる方向に移動するものであることを特徴とする。
In the relationship between the geometrical moment of inertia of the height and width in breaking the claw portion, since the force acts on the height to the power of three, the height is greater than the width in terms of the value of the force generated due to the dimensional error in manufacturing. Poor accuracy. Therefore, if the width of the fracture surface of the claw portion is larger than the height, the accuracy of the force can be improved. As a result, the strength of the claw portion is kept within the upper and lower limit values set from the viewpoint of the biting force of the lid body into the receiving frame and the prevention of scattering of the lid receiving frame set for each of the lid body and the receiving frame. easier to collect.
(Appendix 1) Another underground structure lid receiving frame set is an underground structure lid receiving frame set comprising a receiving frame that defines an opening connected to an underground structure and a lid that closes the opening,
The lid body has a lid body supported by the inner peripheral surface of the receiving frame and provided with a keyhole on the peripheral edge, a lock member provided on the lid body, and a regulating member provided on the lid body. and
The receiving frame has a claw receiving portion integrally provided at a position below the inner peripheral surface,
The regulating member has a valve body that closes the keyhole and a shaft that is swingably supported by the lid body, and the valve body is biased in a direction to close the keyhole,
The lock member includes a lock body, a shaft supporting the lock body with respect to the lid body so as to be able to swing,
It has a pawl integrally provided with the lock main body, and the pawl engages with the pawl receiving portion to prevent opening of the opening, while the pawl does not engage with the pawl receiving portion. allowing the opening to open when rocked to the state,
When the regulating member is swung in the direction in which the valve body opens the keyhole from the closed state, the tip of the valve body comes into contact with the inner peripheral surface of the receiving frame, and the shaft separates from the inner peripheral surface. It is characterized in that it moves to

10 蓋受枠セット
2 蓋体
3 受枠
31 内周面
32 爪受け部
33 蝶番座
4 蓋本体
5 錠部材
51 錠本体
52 軸部
53 爪部
531 切欠(ノッチ)
54,54’ ガイド部
6 規制部材
7 蝶番部材
L1 肉厚
L2 肉厚
L3 幅
T,T’ 接触部位
10 lid receiving frame set 2 lid body 3 receiving frame 31 inner peripheral surface 32 claw receiving portion 33 hinge seat 4 lid body 5 lock member 51 lock body 52 shaft portion 53 claw portion 531 notch
54, 54' guide portion 6 regulating member 7 hinge member L1 thickness L2 thickness L3 width T, T' contact portion

Claims (2)

地下構造物につながる開口を画定する受枠と、該開口を塞ぐ蓋体とを備えた地下構造物用蓋受枠セットにおいて、
前記蓋体は、前記受枠の内周面に支持され周縁部に鍵穴が設けられた蓋本体と、該蓋本体に設けられた錠部材と、該蓋本体に設けられた規制部材とを有するものであり、
前記受枠は、前記内周面よりも下方位置に一体に設けられた爪受け部を有するものであり、
前記規制部材は、前記鍵穴を閉塞する弁体と、前記蓋本体に揺動可能に支持される軸とを有し、該弁体が該鍵穴を閉塞する方向に付勢されたものであり、
前記錠部材は、錠本体と、前記蓋本体に対して該錠本体を揺動可能に支持する軸部と、該錠本体と一体に設けられた爪部とを有し、該爪部が前記爪受け部に係合して前記開口の開放を阻止する一方、該爪部が該爪受け部に係合しない状態に揺動させると該開口の開放を許容するものであり、
前記規制部材を前記弁体が前記鍵穴を閉塞する状態から開放する方向に揺動させると、該弁体の先端が前記受枠の内周面に接触し、該弁体が該鍵穴を閉塞する方向への付勢力に抗して前記軸が該内周面から離れる方向に移動するものであることを特徴とする地下構造物用蓋受枠セット。
An underground structure lid receiving frame set comprising a receiving frame defining an opening leading to an underground structure and a lid body closing the opening,
The lid body has a lid body supported by the inner peripheral surface of the receiving frame and provided with a keyhole on the peripheral edge, a lock member provided on the lid body, and a regulating member provided on the lid body. and
The receiving frame has a claw receiving portion integrally provided at a position below the inner peripheral surface,
The regulating member has a valve body that closes the keyhole and a shaft that is swingably supported by the lid body, and the valve body is urged in a direction to close the keyhole,
The lock member has a lock body, a shaft portion for swingably supporting the lock body with respect to the lid body, and a claw portion provided integrally with the lock body. While engaging with the pawl receiving portion to prevent opening of the opening, when the pawl portion is swung in a state in which the pawl portion does not engage with the pawl receiving portion, the opening is allowed to open,
When the regulating member is oscillated in a direction in which the valve disc closes the keyhole, the tip of the valve disc contacts the inner peripheral surface of the receiving frame, and the valve disc closes the keyhole. A cover receiving frame set for an underground structure, characterized in that said shaft moves in a direction away from said inner peripheral surface against an urging force .
前記蓋本体は、水平方向に延在した支持溝を有するものであり、
前記軸は、前記支持溝に支持されたものであることを特徴とする請求項1記載の地下構造物用蓋受枠セット。
The lid body has a horizontally extending support groove,
2. The lid receiving frame set for an underground structure according to claim 1, wherein said shaft is supported by said support groove.
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JP2004183366A (en) 2002-12-04 2004-07-02 Nippon Chutetsukan Kk Iron lid locking device
JP2009007893A (en) 2007-06-29 2009-01-15 Tomisu:Kk Iron lid opening/closing device
JP2021031908A (en) 2019-08-21 2021-03-01 アクアインテック株式会社 Lid body for underground structure

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