JP5170766B2 - Opening jig insertion hole opening / closing device for lids for underground structures - Google Patents

Description

The present invention normally closes the opening jig insertion hole provided in the lid for an underground structure, but opens the lid for the underground structure that is opened by the opening jig when the lid is opened. The present invention relates to a tool insertion hole opening / closing device.
As used herein, the term “underground structure lid” refers to a large iron lid, a manhole lid, a sewage jar lid for closing an opening through which underground structures, underground structure facilities, etc. in sewer facilities are connected to the ground. Or openable joint groove iron lid, power transmission iron lid, power distribution iron lid, underground conduit in the water supply facilities and gas supply facilities, and its accessories A fire hydrant lid, a water control valve lid, a gate valve lid, an air valve lid, a gas pipe lid, a water meter lid, and the like having a function as an open / close door connecting the equipment and the ground are collectively referred to.

This type of underground structure lid includes a lid body and a receiving frame that supports the lid body so as to be openable and closable, and is used to open the lid body on the outer peripheral edge of the lid body. An opening jig insertion hole is opened. More specifically, the opening jig insertion hole penetrates from the front surface to the back surface of the lid main body, and an opening jig such as a bar or a hand can be inserted.
By the way, if the above-described opening jig insertion hole is left open, for example, rainwater enters the underground structure through the opening jig insertion hole. Therefore, when the underground structure is a sewer system, the infiltrated rainwater places an extra load on the sewage treatment capacity of the treatment plant. Moreover, if soil or the like enters through the opening jig insertion hole and accumulates in the underground structure, it will not only hinder the opening and closing of the gate valve etc. in the underground structure, but will also open the lid. The jig insertion hole itself is blocked by earth and sand, which causes many problems such as difficulty in inserting the lid opening jig.

Various proposals have heretofore been made in order to solve the above-mentioned problems, and one of them is a lid for an underground structure provided with a lid opening insertion device for opening and closing the opening jig insertion hole in the lid body. Is known (for example, Patent Document 1). The lid opening jig insertion hole opening / closing device of Patent Document 1 includes a valve mechanism provided on the back surface of the lid body and a return mechanism of the valve mechanism. Specifically, the valve mechanism is composed of a rotating shaft and a valve plate provided at the tip of an arm extending from the rotating shaft, for opening and closing a burl insertion hole (opening jig insertion hole). The mechanism allows sliding of the rotary shaft in the radial direction of the lid body, and is provided at the rotary shaft sliding groove formed in a descending gradient toward the outer peripheral edge of the lid body, and at the other end of the arm. It consists of a balance weight that gives a restoring force to the.
Japanese Utility Model Publication No. 58-3888

In the lid opening jig insertion hole opening / closing apparatus of Patent Document 1 described above, when the lid body is housed in the receiving frame when the lid is opened and the bar is pulled out from the bar insertion hole, the arm rotates around the rotation axis. With this, the valve plate automatically returns toward the closed position where the burl insertion hole is closed.
At this time, since the tip of the valve plate moves toward the closed position while contacting the inner peripheral surface of the receiving frame, the tip of the valve plate is caught on the inner peripheral surface of the receiving frame in this moving process, and moves to the closed position. There is a possibility that the return of the valve plate becomes impossible.

Further, in the case of Patent Document 1, since the rotary shaft slides in the radial direction of the lid body along the rotary shaft sliding groove when the valve plate is opened and closed, the rotary shaft sliding groove and Due to the presence of the balance weight, the opening / closing jig insertion hole opening / closing device inevitably has a large size and weight.
The present invention has been proposed in view of the above-described problems. The lid opening jig insertion hole can be opened and closed smoothly and easily, and can be reduced in size and weight. An object of the present invention is to provide a lid opening jig insertion hole opening / closing device for a lid for an underground structure that can be easily attached.

In order to achieve the above object, the present invention includes a lid body having an opening jig insertion hole into which an opening jig is inserted at an outer peripheral edge portion, and a receiving frame that supports the lid body so that the lid body can be opened and closed. The lid opening jig insertion hole opening and closing device for the underground structure lid is provided on the back surface of the lid body in the vicinity of the opening jig insertion hole. A vertical wall, and a closure plug unit pivotally supported on the vertical wall. The closure plug unit includes an arm-shaped plug carrier having a longitudinal direction corresponding to the radial direction of the lid body, and a plug. A closing plug provided at the tip of the carrier , which closes the opening jig insertion port at the closing position , and a rotation that urges the stopper carrier to rotate in a direction to close the opening jig insertion hole. and a Dozukezei means, the inner wall of the lid opening jig insertion hole facing radially outward of the cover body, down toward the center of the lid body An inclined surface which becomes oblique, embolization, compared tip of the plug carrier, a fixed amount only slidably mounted in the longitudinal direction of the plug carrier, closed position by the rotation urging unit from the depressed state When moving backward, the base end side slides toward the distal end side of the plug carrier by contacting the inclined surface (Claim 1).

According to the lid opening jig insertion hole opening and closing device according to claim 1, when the lid body is fitted to the receiving frame, usually embolization In the closed position for closing the lid opening jig insertion hole, this time The plug carrier is held at the closed position by the rotation urging force of the plug urging means. Therefore, when the blocking plug is in the blocking position, the blocking plug prevents rainwater, earth and sand, etc. from entering the underground structure through the opening jig insertion hole.

  From this state, when the lid opening jig is inserted into the opening jig insertion hole, and when the closing plug is pushed down together with the plug carrier against the rotation bias of the rotation biasing means by this lid opening jig, The closure plug slides relative to the plug carrier. Therefore, at the time of pushing down, the closing plug is pushed down without being caught by the inner wall of the opening jig insertion hole or the inner peripheral surface of the receiving frame, and the insertion of the opening jig, that is, the opening jig insertion hole Opening becomes smooth.

On the other hand, when the opening jig is pulled out from the opening jig insertion hole, the closing plug receives the rotation biasing force of the rotation biasing means and smoothly returns toward the closing position together with the stopper carrier .

  In this case, when the closure plug is pushed down and slides once and then returns to the closed position, the closure plug is placed on the inclined surface on the upper surface of the inner end portion located inward in the radial direction of the lid body. Abut. By the abutment here, the inclined surface guides the closure plug so as to return the slide of the closure plug to the original position, and thereby the closure plug surely returns to the closed position without having its own return means, Close the opening jig insertion hole.

More specifically, the lid opening jig insertion hole opening / closing device is provided at the distal end of the stopper carrier, and is provided in the closure stopper with a protruding ridge extending in the longitudinal direction of the stopper holder, and the protruding ridges are relative to each other. And a slidably receiving recess (claim 2 ), and these ridge and recess provide a smooth and reliable sliding of the closure plug.
The lid opening jig insertion / closing device according to the present invention includes a vertical wall provided on the back surface of the lid main body in the vicinity of the opening jig insertion hole, and a shaft pivotable on the vertical wall. A supported obturator plug unit,
The closure plug unit is configured to rotate the stopper carrier in a direction in which the opening jig insertion hole is closed by the closure plug, an arm-shaped stopper carrier, a closure plug provided at a tip of the stopper carrier, and the closure stopper. A rotation biasing means for moving biasing,
The closing plug is slidably attached to the tip of the plug carrier by a certain amount in the longitudinal direction of the plug carrier,
The longitudinal direction of the plug carrier coincides with the radial direction of the lid body,
The closure plug unit is provided on the distal end side of the stopper carrier and has a ridge extending in the longitudinal direction of the stopper carrier, and provided in the closure stopper, and the ridge is relatively slidable. And a concave line portion to be received in (claim 3).
With such a configuration, when the lid main body is fitted to the receiving frame, the closing plug is normally in the closing position for closing the opening jig insertion hole, and at this time, the closing biasing means is moved to the closing position. The stopper carrier is held in response to the rotational urging force. Therefore, when the closing plug is in the closing position, the closing plug prevents rainwater or earth and sand from entering the underground structure through the opening jig insertion hole. From this state, when the lid opening jig is inserted into the opening jig insertion hole, and when the closing plug is pushed down together with the plug carrier against the rotation bias of the rotation biasing means by this lid opening jig, The closure plug slides relative to the plug carrier. Therefore, at the time of pushing down, the closing plug is pushed down without being caught by the inner wall of the opening jig insertion hole or the inner peripheral surface of the receiving frame, and the insertion of the opening jig, that is, the opening jig insertion hole Opening becomes smooth. On the other hand, when the opening jig is pulled out from the opening jig insertion hole, the closing plug receives the rotation biasing force of the rotation biasing means and smoothly returns toward the closing position together with the stopper carrier. Furthermore, the ridges and the ridges provide a smooth and reliable slide of the closure plug.

Since the closing jig insertion hole opening / closing device of claims 1 to 3 can slide the closing plug, the opening and closing of the opening jig insertion hole can be smoothly and reliably performed by the closing jig, The overall size can be made compact and the weight can be reduced. Furthermore, since the lid opening jig insertion hole opening / closing device is only attached to the lid body via the rotation shaft and the rotation biasing means, the attachment here is also simplified.

1 and 2 show a part of a lid for an underground structure, that is, a lid body 2. The lid body 2 can be fitted to a receiving frame 4 installed on the upper part of the underground structure indicated by a two-dot chain line in FIG. 1 to close the opening of the receiving frame 4. In this case, the inner peripheral surface of the receiving frame 4 And the outer peripheral surface of the lid body 2 is formed as a female and male tapered surface, respectively.
As is apparent from FIG. 2, the lid body 2 includes a cast iron lid base 3 provided with a recess 6 over almost the entire upper surface of the lid body 2, and a synthetic resin exterior panel fitted in the recess 6. The exterior board 8 has an upper surface that is flush with the upper surface of the lid body 2 as indicated by a two-dot chain line in FIG. Such an exterior panel 8 made of synthetic resin greatly contributes to the weight reduction of the lid for the underground structure. 1 and 2, reference numeral 10 indicates a mounting hole for mounting the exterior panel 8.

  A rectangular opening jig insertion hole (hereinafter simply referred to as an insertion hole) 12 is formed in the outer peripheral edge of the lid body 2, and the insertion hole 12 penetrates the lid body 2 in the vertical direction. Further, a coupling portion 14 for a hinge mechanism (not shown) that connects the lid body 2 and the receiving frame 4 so as to be openable and closable is formed on the rear surface of the outer peripheral edge of the lid body 2, which is apparent from FIGS. As described above, the coupling portion 14 is separated from the insertion hole 12 in the diameter direction of the lid body 2.

Further, on the rear surface of the lid body 2, a vertical wall 18 provided in the vicinity of the insertion hole 12, and a rotatably supported occlusive plug unit 22 in the vertical wall 18, the insertion holes An opening / closing jig insertion hole opening / closing device (hereinafter simply referred to as an opening / closing device) 16 for opening / closing 12 is provided. The occlusion plug unit 22 is omitted in FIGS. 1 and 2, and details thereof are shown in FIGS. 3 to 8.
FIG. 3 shows the opening / closing device 16 provided on the back surface of the lid body 2.

A pair of vertical walls 18 are formed in the vicinity of the insertion hole 12 so as to protrude downward from the back surface of the lid body 2. More specifically, the pair of vertical walls 18 are separated from each other in the circumferential direction of the lid main body 2, and when viewed in the radial direction of the lid main body 2, the radial direction of the lid main body 2 extends from the lower side of the insertion hole 12 over the insertion hole 12. It extends to the inside.
In the case of the present embodiment, as is apparent from FIG. 4, the vertical wall 18 is formed continuously with the edge winding rib 20 formed on the outer periphery of the back surface of the lid body 2 except for the portion corresponding to the insertion hole 12. The distance between the pair of vertical walls 18 matches the opening width of the insertion hole 12.

Between the pair of vertical walls 18 described above, the closing plug unit 22 is rotatably attached to the pair of vertical walls 18. FIG. 5 shows the obturator plug unit 22 separated from the vertical wall 18 in a perspective view.
The closing plug unit 22 includes a stainless steel plug carrier 24, and the plug carrier 24 has a bent arm shape as a whole. The base end portion of the plug carrier 24 forms a pair of base ends 26 having a bifurcated shape separated in the separating direction of the pair of vertical walls 18. Rotating shafts 28 are integrally projected from the outer surfaces of the base ends 26, and the rotating shafts 28 are arranged on the same axis.

Outer ends of the pivot shaft 28 is rotatably supported by the bearing hole 32 formed on a pair of vertical walls 18 shown in FIG. Specifically, the bearing hole 32 is defined at the end of the groove 30, and this groove 30 extends upward from the lower end edge of the vertical wall 18, and then once inside the lid body 2 in the radial direction. It has a shape that extends horizontally and further downwards to become a terminal end, that is, a bearing hole 32.

Further, as is apparent from FIG. 2, the bearing hole 32 is positioned inward of the vertical wall 18 and at the upper part when viewed in the radial direction of the lid body 2.
The pivot shaft 28 of the plug carrier 24 can be inserted into the groove 30 of the corresponding vertical wall 18 from below, and moved to the end along the groove 30 so that the bearing shaft 32 falls into the bearing hole 32. The hole 32 is rotatably supported.

  As described above, when the base end 26 of the plug carrier 24 is rotatably supported by the pair of vertical walls 18 via the rotation shaft 28, the plug carrier 24 is interposed between the vertical walls 18. 18, that is, along the radial direction of the lid body 2, and has a distal end located on the insertion hole 12 side. Then, when the plug carrier 24 is pivoted up and down around the pivot shaft 28, the tip of the stopper carrier 24 contacts and separates from the insertion hole 12.

  Further, a torsion coil spring (rotation urging means) 34 is attached to the plug carrier 24. As is clear from FIG. 5, the torsion coil spring 34 is sandwiched between the bifurcated base end 26 of the plug carrier 24, and the torsion coil spring 34 is hooked on the base end 26 of the plug carrier 24 from below. One end 36 and the other end 38 hooked on the lid main body 2 are provided, and the plug carrier 24 is urged to rotate upward.

Specifically, as is apparent from FIG. 3 and FIG. 5, the other end 38 of the torsion coil spring 34 is formed as a hook and is hooked on a protrusion 40 integrally formed on the back surface of the lid body 2. . Further, the torsion coil spring 3 4 at both ends the spring mounting pins 42 (see FIG. 7) are arranged respectively, these spring mounting pins 42 are integrally projected from the inner surfaces of the pair of proximal end 26 .
As shown in FIGS. 3 and 5, a stopper plug 44 made of a synthetic resin is attached to the tip of the stopper carrier 24, and the stopper stopper 44 is located at the upper part thereof on the back side of the lid body 2. The insertion hole 12 can be closed. When in the closed position shown in FIG. 3, the upper surface of the closing plug 44 is positioned below a predetermined distance from the upper surface of the lid body 2, that is, the upper surface opening of the insertion hole 12.

  Further, when the lid body 2 is fitted to the receiving frame 4, the closing plug 44 in the closing position is placed on the inner peripheral surface of the receiving frame 4 and the inner peripheral surface of the receiving frame 4 indicated by a two-dot chain line in FIG. 3. It is clamped between the inner walls 12a of the insertion holes 12 facing each other. More specifically, the inner wall 12a of the insertion hole 12 faces the radially outer side of the lid body 2, and the lower portion of the inner wall 12a is formed as an inclined surface 46 that holds the closing plug 44 in cooperation with the inner peripheral surface of the receiving frame 4. Has been. The inclined surface 46 is inclined downward toward the center of the lid body 2.

Further, on the upper surface of the closing plug 44, corners on the inner peripheral surface side of the receiving frame 4 and the inclined surface 46 side of the insertion hole 12 are respectively formed in upwardly projecting arc surfaces 48, 50. 50 has a predetermined radius of curvature.
On the other hand, the closing plug 44 is attached to the distal end of the plug carrier 24 so as to be slidable in the longitudinal direction of the plug carrier 24, that is, in the radial direction of the lid body 2. Specifically, as apparent from FIGS. 6 and 7, a plurality of, for example, three ridges 52 are formed on the top surface of the distal end of the plug carrier 24, and these ridges 52 are formed on the stopper carrier. 24 extend parallel to each other in the longitudinal direction.

  On the other hand, an insertion hole 54 is formed in the rear end surface of the obturator plug 44 on the arcuate surface 50 side, and the distal end side of the plug carrier 24 having the ridges 52 can be inserted into the insertion hole 54. That is, as shown in FIG. 6, the bottom of the insertion hole 54 is formed by the intermediate wall 56 in the closing plug 44, and each protrusion 52 is slidably received on the upper surface of the insertion hole 54. A concave portion 58 is formed. The combination of the projecting ridges 52 and the recessed ridges 58 enables a smooth slide of the closing plug 44 with respect to the plug carrier 24.

  A stopper hole 60 is formed at the center of the intermediate wall 56, and the stopper hole 60 extends vertically through the intermediate wall 56 and extends a predetermined length in the longitudinal direction of the plug carrier 24. On the other hand, a stopper projection 62 is integrally formed on the lower surface of the distal end side of the plug carrier 24, and the stopper projection 62 is positioned in the stopper hole 60. Therefore, the closing plug 44 can slide back and forth with respect to the plug carrier 24 until the front end or the rear end of the stopper hole 60 contacts the stopper projection 62. Such a stopper hole 60 not only determines the sliding amount of the blocking plug 44 depending on the length thereof, but also reliably prevents the blocking plug 44 from falling off the plug carrier 24.

In order to enable the positioning of the stopper projection 62 to the stopper hole 60, the intermediate wall 56 is integrally coupled to the closing plug 44 only at the end portion on the front end side of the closing plug 44, and its periphery is apparent from FIG. In a state separated from the closing plug 44. That is, the intermediate wall 56 is cantilevered in the closing plug 44 and can be elastically deformed around its end.
Therefore, when the distal end of the plug carrier 24 is inserted into the insertion hole 54 of the closing plug 44, the stopper projection 62 is elastically deformed so as to push down the intermediate wall 56, thereby being positioned in the stopper hole 60. .

Next, opening and closing of the underground structure lid will be described below with reference to FIGS. 9 to 12, the torsion coil spring 34 is omitted.
FIG. 9 shows a state in which a cover for an underground structure is fitted to the receiving frame 4. At this time, the closing plug 44 is in the closed position and closes the insertion hole 12 of the lid body 2 from below. When in the closed position, the closing plug 44 is urged upward in the direction of closing the insertion hole 12 by the rotational urging force of the torsion coil spring 34 as shown by the arrow in FIG. 3 is sandwiched between the inner peripheral surface of the receiving frame 4 and the inclined surface 46 of the insertion hole 12, and this state is the same as the state shown in FIG.

When in the closed position, the closing plug 44 is positioned below the upper surface of the lid body 2, so that even if a vehicle tire passes through the upper surface of the lid body 2, the tire contacts the closing plug 44. However, it is possible to reliably prevent the obstruction plug 44 from being damaged by the contact here.
From the state shown in FIG. 9, a lid opening jig A such as a bar or a handclaw is inserted into the insertion hole 12 at an angle, and as shown in FIG. 10, the closing plug 44 resists the above-described rotational biasing force, thereby opening the lid. When the plug A is pushed down via the plug carrier 24, the closing plug 44 moves away from the inclined surface 46 of the insertion hole 12, and slides toward the proximal end side with respect to the plug carrier 24. Therefore, since the closing plug 44 is separated from the inner peripheral surface of the receiving frame 4, it is pushed down without sliding on the inner peripheral surface of the receiving frame 4, and the pressing of the closing plug 44, that is, the opening of the insertion hole 12 is smoothly performed. Can be done.

  Thereafter, when the closing jig A is further inserted as shown in FIG. 11, the closing plug 44 is further pushed down with the rotation of the plug carrier 24. At this point, if the lid closing jig A is operated in the manner of a lever to lift the tip of the lid opening jig A upward with the receiving frame 4 as a fulcrum, the lid body 2 and the receiving frame 4 are disengaged, and the lid body 2 rotates around the hinge axis of the hinge mechanism and can open the receiving frame 4.

Thereafter, when the lid opening jig A is pulled out from the insertion hole 12, the closing plug 44 receives the rotational biasing force of the torsion coil spring 34 and moves backward toward the closing position via the plug carrier 24.
At this time, even if the closing plug 44 is slid to the proximal end side of the plug carrier 24 as described above, the upper end of the rear end surface of the closing plug 44 has the insertion hole 12 as shown in FIG. By coming into contact with the inclined surface 46, it is pushed out toward the distal end side of the plug carrier 24 while being guided by the inclined surface 46. That is, the closing plug 44 slides in the opposite direction with respect to the plug carrier 24 and reliably returns to the closing position.

Moreover, since the upper part of the rear end surface of the closure plug 44 is formed on the arc surface 50, the reverse slide of the closure plug 44 by the inclined surface 46, that is, the return of the closure plug 44 to the closed position is performed smoothly. In addition, when the arc surface 50 is in close contact with the inclined surface 46 at the closing position, the closing plug 44 can reliably seal the insertion hole 12.
On the other hand, after the lid body 2 is re-fitted to the receiving frame 4 before the closing jig A is pulled out, the lid body 2 is received when the closing jig A is pulled out or after the closing jig A is pulled out. 4, even when the closing plug 44 is slid to the distal end side of the plug carrier 24 from the closing position, the closing plug 44 has its front end face as apparent from FIG. Comes into contact with the inner peripheral surface of the receiving frame 4 and is guided by the inner peripheral surface, thereby sliding toward the closed position and reliably and smoothly returning to the closed position.

Further, the obturator plug 44 has a front end surface, and since the upper portion of the front end surface is formed on the arc surface 48, the obturator plug 44 is pushed down and a child or the like puts a finger in the insertion hole 12 by mischief. Even if it is inserted, the finger is sandwiched between the closing plug 44 and the inner peripheral surface of the receiving frame 4, so that it will not be lost.
Furthermore, since the aforementioned closure plug 44 of the closure plug unit 22 is formed of a synthetic resin, the weight reduction of the closure plug unit 22 is achieved, and the closure plug unit 22 has a pair of rotating shafts 28. Is attached to the bearing hole 32 of the lid body 2 and the other end 38 of the torsion coil spring 34 is hooked on the protrusion 40 of the lid body 2 to complete the attachment of the closure plug unit 22 to the lid body 2. As a result, the opening / closing device can be easily assembled to the lid body 2.

  The present invention is not limited to the opening / closing device of the above-described embodiment, and the specific shape, arrangement, and the like of the closure plug unit 22 and the bearing hole 32 on the lid body 2 side can be variously changed.

It is the top view which showed the cover main body of the cover for underground structures of one Example. FIG. 2 is a cross-sectional view of the lid main body taken along line II-II in FIG. 1. It is the figure which showed the opening / closing apparatus of the insertion hole of a lid | cover main body. It is the figure which showed a part of back surface of the lid | cover main body of FIG. It is the perspective view which showed the obstruction | occlusion stopper unit of the opening / closing apparatus of FIG. FIG. 6 is a partially cutaway view of the closure plug unit of FIG. 5. It is the perspective view which showed the stopper support body of the obstruction | occlusion stopper unit of FIG. It is the figure which looked at the obstruction | occlusion stopper of the obstruction | occlusion stopper unit of FIG. 5, 6 from the rear end surface. It is the figure which showed the state in which the cover main body was fitted by the receiving frame, and the obstruction | occlusion stopper exists in the obstruction | occlusion position. It is a figure which shows the state which the obstruction | occlusion stopper was pushed down and slid by the opening jig | tool from the state of FIG. It is a figure which shows the state by which the obstruction | occlusion stopper was further pushed down from the state of FIG. It is a figure for demonstrating the state of a slide of an obstruction stopper when an obstruction stopper returns to an obstruction position.

Explanation of symbols

2 lid body 3 lid base 4 receiving frame 6 recess 8 exterior panel 12 insertion hole (opening jig insertion hole)
12a Inner wall (insertion hole)
16 Opening / closing device 18 Vertical wall 22 Blocking plug unit 24 Plug carrier 28 Rotating shaft 32 Bearing hole 34 Torsion coil spring (rotating biasing means)
40 Projection 42 Spring mounting pin 44 Closure plug 46 Inclined surface 52 Projection strip 54 Insertion hole 48, 50 Arc surface 56 Intermediate wall 58 Concave strip 60 Stopper hole 62 Stopper projection

Claims (3)

Opening jig insertion of a lid for an underground structure provided with a lid main body having an opening jig insertion hole into which an opening jig is inserted at the outer peripheral edge and a receiving frame that supports the lid main body so as to be opened and closed. In the hole opening and closing device,
The lid opening jig insertion hole opening / closing device includes a vertical wall provided on the back surface of the lid body in the vicinity of the opening jig insertion hole, and a closure pivotally supported by the vertical wall. With a stopper unit,
The closure plug unit is provided at the distal end of the arm-shaped plug carrier having a longitudinal direction that coincides with the radial direction of the lid body , and closes the opening jig insertion hole at the closure position. A closing urging means, and a rotation urging means for urging and urging the stopper carrier in a direction to close the opening jig insertion hole by the obstruction plug,
The inner wall of the opening jig insertion hole facing the radially outer side of the lid body has an inclined surface that is inclined downward toward the center of the lid body,
The closing plug is slidably attached to the distal end of the stopper carrier by a certain amount in the longitudinal direction of the stopper carrier, and is moved backward from the depressed state toward the closing position by a rotation biasing means. When opening the lid opening device for opening and closing the underground structure lid , the base end side slides toward the distal end side of the plug carrier by contacting the inclined surface . A protruding strip provided on the distal end side of the stopper carrier and extending in the longitudinal direction of the stopper carrier;
The opening / closing jig insertion hole opening / closing device for a lid for an underground structure according to claim 1, further comprising: a concave portion that is provided in the closing plug and receives the convex portion relatively slidably . Opening jig insertion of a lid for an underground structure provided with a lid main body having an opening jig insertion hole into which an opening jig is inserted at the outer peripheral edge and a receiving frame that supports the lid main body so as to be opened and closed. In the hole opening and closing device,
The lid opening jig insertion hole opening / closing device includes a vertical wall provided on the back surface of the lid body in the vicinity of the opening jig insertion hole, and a closure pivotally supported by the vertical wall. With a stopper unit,
  The closure plug unit is configured to rotate the stopper carrier in a direction in which the opening jig insertion hole is closed by the closure plug, an arm-shaped stopper carrier, a closure plug provided at a tip of the stopper carrier, and the closure stopper. A rotation biasing means for moving biasing,
The closing plug is slidably attached to the tip of the plug carrier by a certain amount in the longitudinal direction of the plug carrier,
The longitudinal direction of the plug carrier coincides with the radial direction of the lid body,
The closure plug unit is provided on the distal end side of the stopper carrier and has a ridge extending in the longitudinal direction of the stopper carrier, and provided in the closure stopper, and the ridge is relatively slidable. An opening jig insertion hole opening / closing device for a lid for an underground structure, comprising:

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