JP5424420B2 - Cover for underground structure - Google Patents

Description

The present invention relates to a lid for an underground structure installed in an opening such as a manhole.
As used herein, the term “underground structure lid” refers to an underground buried object in a sewer, a large iron lid that closes an opening through the ground structure facility, etc. and the ground, a manhole lid, a sewage lid, Openable and closable joint gutter lids, power transmission iron lids, power distribution iron lids, buried conduits under the road surface in waterworks and gas pipes, and their associated equipment to protect underground facilities equipment and underground cables in communications A fire hydrant lid having a function as an open / close door, a water control valve lid, a gate valve lid, an air valve lid, a gas pipe lid, a water meter lid, etc. are collectively referred to.

  A lid for an underground structure installed in an opening such as a manhole is composed of a lid body and a receiving frame. Specifically, this lid body is attached to the receiving frame so as to be opened and closed via a hinge (for example, a patent). Reference 1 and 2). Conventionally, when opening the lid body, an opening / closing bar is inserted into a bar hole provided at one end of the outer periphery of the lid body to release the bite between the lid body and the receiving frame, and the hinge retaining piece is attached to the hinge seat of the receiving frame. Pull the lid body diagonally upward (specifically, the front side of the operator) until it is locked, and then turn the lid body horizontally by 180 ° about the hinge or move the lid body upward with the hinge as a fulcrum It was lifted to 180 ° and inverted vertically by 180 °. Then, when closing the lid main body, an operation reverse to the above is performed, and the operator pushes the lid main body obliquely downward (in the direction where the hinge is located) and puts it in the receiving frame.

  However, when the lid body is pushed obliquely downward and closed, the hinge side of the lid body largely falls into the receiving frame, and the lid body may fit into the receiving frame as it is. As a result, the lid main body could not be completely accommodated in the receiving frame, and the operator again pulled the lid main body obliquely upward and closed it again. This has led to complicated operations and a reduction in work efficiency. In addition, if the cover body is pushed in with only one end of the lid body as described above, the lid body fits in the receiving frame in an oblique state, or the lid body is pushed in force, The hinge side slides up from the receiving frame. This causes a step between the lid main body and the receiving frame, which may cause a pedestrian to trip or cause the lid main body to rise further when the vehicle passes over the step.

  In order to eliminate such a step, when the lid body is fitted diagonally with respect to the receiving frame, the adjustment was made by hitting the peripheral edge of the lid body. Passengers and vehicles are resumed.

Japanese Utility Model Publication No.57-58296 JP 2001-355252 A

  The present invention is based on the above prior art, and when the lid body is closed, it is possible to prevent a step between the lid body and the receiving frame and to ensure that the lid body is in a horizontal state with respect to the receiving frame. An object of the present invention is to provide a lid for an underground structure that can be stored.

In order to achieve the above object, in the present invention, a receiving frame, a hinge projecting inside the receiving frame, having a receiving portion at the tip, and having a hinge insertion hole in the center, and being inserted into the hinge insertion hole of the hinge seat Open and close with respect to the receiving frame via a hinge having a retaining part formed at the lower end and a head part formed at the upper end and the hinge swingably attached to the lower side. In the lid for an underground structure including a lid body that can be attached, the shaft portion of the hinge has a concave portion including a curved surface curved in a longitudinal section, and the receiving portion of the hinge seat includes the At least a portion of the upper surface of the side facing the hinge insertion hole formed I mimic the curved surface, the head portion of the hinge can contact the projecting portion is formed on受載portion of the hinge seat, the the protruding portion of the underground construction for the lid, characterized in that it has a curved surface similar to the curved surface of said recess Subjected to (claim 1).

Preferably, the hinge is between a closed position in a state where the lid main body is housed in the receiving frame and an open position in which the retaining piece is in contact with the hinge seat and extends inward of the receiving frame. When the lid main body is pushed to the hinge side, the hinge shaft is lowered while sliding along the receiving portion of the hinge seat, and the receiving portion enters the recess. The hinge rotates about the receiving portion as a rotation axis, and the upper surface of the lid main body moves while maintaining a substantially parallel state with respect to the upper surface of the receiving frame, and the concave portion moves away from the receiving portion and the lid main body. When the upper surface of the projection frame falls in a state of being substantially parallel to the upper surface of the receiving frame, the protruding portion formed on the head portion of the hinge contacts the upper surface of the receiving portion, and the curved surface of the protruding portion is It is in sliding contact with a curved surface formed on a part of the upper surface of the receiving portion. It said hinge is a closed position (claim 2).

Preferably, the head portion of the hinge has a protruding piece extending to at least one of the left and right sides, and a receiving piece that can contact the protruding piece is formed on the lower side of the lid body, The hinge is in a substantially vertical posture with respect to the upper surface of the receiving frame in a state where the protruding piece and the receiving piece are in contact with each other (Claim 3) .

Preferably, the lid body has a guide portion that contacts an upper surface of the receiving frame when the lid body is received in the receiving frame, and the guide portion has a lower surface substantially parallel to the upper surface of the lid body. (Claim 4) .

Preferably, the upper surface of the lower surface or the receiving frame of the guide portion, the engaging portion for restricting the movement of the guide portion is provided (claim 5).

Preferably, the guide part is provided to be exposed on a lower side of the lid body opposite to a side on which the hinge is attached to the lid body, and extends radially from a center of the lid body. It is formed to be symmetrical with respect to the center line and connecting the center of the lid body (claim 6).

According to the invention of claim 1, since the receiving portion of the hinge seat has at least a part of the upper surface facing the hinge insertion hole following the curved surface of the recess formed in the hinge, the receiving portion of the hinge seat is The part comes into contact with the concave part, and the hinge rotates around the receiving part of the hinge seat. Therefore, while the hinge is rotating, the lid body moves in the lateral direction (in a direction parallel to the upper surface of the receiving frame) in the same posture. Thereby, it can prevent that a cover main body enters toward diagonally downward with respect to a receiving frame. When the hinge is rotated to some extent and the hinge is in a substantially vertical posture with respect to the upper surface of the receiving frame, the concave portion is separated from the receiving portion of the hinge seat. At this time, since the lid body has been moved in the lateral direction, it falls toward the receiving frame in a state of being substantially parallel to the receiving frame, and the protrusion formed on the hinge head portion contacts the receiving portion of the hinge seat. By contacting, the curved surface of the projecting portion comes into sliding contact with the curved surface formed on a part of the upper surface of the receiving portion, and the lid body is finally closed . Therefore, when the lid main body is closed, the lid main body and the receiving frame are fitted obliquely and a step is prevented from being generated, and the lid main body can be reliably stored in a substantially parallel state with respect to the receiving frame.

According to the second aspect of the present invention, when the lid main body is housed in the receiving frame and closed, that is, when the hinge is moved to the closed position, the hinge recess enters the receiving portion of the hinge seat and the hinge rotates. In the meantime, the lid body can be moved in a substantially parallel state with respect to the receiving frame. Then, when the concave portion is separated from the receiving portion in the state as it is, the lid body is dropped with respect to the receiving frame, so that the protruding portion formed on the head portion of the hinge comes into contact with the receiving portion of the hinge seat, thereby protruding. The curved surface of the portion comes into sliding contact with the curved surface formed on a part of the upper surface of the receiving portion, and finally the hinge can be moved to the closed position. For this reason, when the lid body is closed, it is possible to prevent the lid body and the receiving frame from being obliquely fitted and to generate a step, and the lid body can be securely placed in a substantially parallel state with respect to the receiving frame.

  According to invention of Claim 3, rotation of a hinge is controlled in the state which the protrusion piece and the receiving piece contact | abutted. At this time, the hinge in a substantially vertical posture with respect to the upper surface of the receiving frame is restricted from rotating by bringing the protruding piece and the receiving piece into contact with each other. Accordingly, the lid body can be moved in a direction substantially parallel to the receiving frame.

  According to the invention of claim 4, the lid main body can be moved in parallel to the receiving frame via the guide portion along the upper surface of the receiving frame, and reliably coupled with the above-described pivoting operation of the hinge. The lid body can be moved parallel to the receiving frame.

  According to the invention of claim 5, since the locking portion for restricting the movement of the guide portion is provided on the lower surface of the guide portion or the upper surface of the receiving frame, the underground structure lid is installed on the inclined road surface. Even if it is the case where it is carried out, it can prevent that a cover body slides in a receiving frame along the upper surface of a receiving frame with the dead weight.

  According to the invention of claim 6, even when the lid body is slightly displaced from side to side with respect to the receiving frame, the radially formed guide portions guide the lid body to a predetermined position so that the lid body is in an appropriate state. Can fit into the receiving frame. That is, when the hinge is in the open position, even when the center line of the lid main body and the center line of the receiving frame corresponding to the center line do not coincide with each other in plan view, the lid main body follows the receiving frame. Are moved in the direction in which both center lines coincide with each other by the radially formed guide portions. For this reason, the operation | work which closes a cover main body becomes easy.

It is the schematic of the lid | cover for underground structures which concerns on this invention. It is a partial schematic sectional drawing when a hinge is attached to a lid body. It is a schematic perspective view of a hinge. It is a schematic bottom view of a lid body. It is a schematic right view of a lid body. It is the schematic sectional drawing which showed the state in which a cover main body is settled in a receiving frame in order. It is the schematic sectional drawing which showed the state in which a cover main body is settled in a receiving frame in order. It is the schematic sectional drawing which showed the state in which a cover main body is settled in a receiving frame in order. It is the schematic sectional drawing which showed the state in which a cover main body is settled in a receiving frame in order. It is the schematic sectional drawing which showed the state in which a cover main body is settled in a receiving frame in order. It is the schematic sectional drawing which showed the state in which a cover main body is settled in a receiving frame in order. It is the schematic sectional drawing which showed the state in which a cover main body is settled in a receiving frame in order. It is a schematic sectional drawing of an auxiliary bar hole vicinity. It is a partial schematic sectional drawing when a cover main body is stored in the receiving frame.

  As shown in FIG. 1, an underground structure lid 1 according to the present invention includes a substantially disc-shaped lid body 2 and a substantially annular receiving frame 3 in which the lid body 2 is accommodated.

  The receiving frame 3 is installed in an opening such as a manhole, and is embedded with the upper surface 3a of the receiving frame 3 exposed. The lid body 2 is attached to the receiving frame 3 through a hinge 4 so as to be opened and closed. As is clear from FIGS. 2 and 3, the hinge 4 is provided with a retaining piece 5 protruding in the left-right direction at the lower end. A head portion 6 is formed at the upper end of the hinge 4. A rotation shaft 7 extending in the left-right direction is formed on the head portion 6. The hinge 4 is swingably attached to the lower side of the lid body 2 through the rotating shaft 7. Specifically, a substantially box-shaped bearing body 10 is provided on the back surface side of the lid body 2, and the rotating shaft 7 is pivotally supported on the bearing body 10.

  On the other hand, a hinge seat 8 is provided on the inner peripheral surface of the receiving frame 3 described above so as to protrude in the center direction. The hinge seat 8 forms a hinge insertion hole 8a penetrating in the vertical direction. The shaft portion 9 of the hinge 4 is inserted into the hinge insertion hole 8a, and the retaining piece 5 is connected to the longitudinal direction of the hinge insertion hole 8a. The hinge 4 is prevented from coming off the hinge seat 8 by being positioned in the intersecting direction, and the two are connected. Thereby, the lid body 2 is opened and closed with respect to the receiving frame 3 by the shaft portion 9 moving while being inserted through the hinge insertion hole 8a.

  A concave portion 11 is formed in the shaft portion 9 of the hinge 4. The recess 11 is formed so as to be recessed from the front side to the rear side of the shaft portion 9 in the left-right width direction. In the state where the shaft portion 9 when the lid body 2 is housed in the receiving frame 3 is inserted into the hinge insertion hole 8a of the hinge seat 8, the hinge portion 8 is moved from the receiving portion 8b side to the hinge insertion hole 8a side. It is formed so as to be recessed in the left-right width direction. In the longitudinal section obtained by cutting the shaft portion 9 in the longitudinal direction, the inner surface of the recess 11 is curved. That is, the recess 11 has a curved surface. Further, the receiving portion 8 b of the hinge seat 8 has a part of the upper surface facing the hinge insertion hole 8 a so as to follow the curved surface of the recess 11 and have substantially the same curvature.

  The head portion 6 of the hinge 4 is formed with a protruding piece 13 extending in a direction parallel to the retaining piece 5. In the example of FIG. 1, the protruding piece 13 extends in both the left and right directions of the head portion 6, but it is sufficient that either one of them is extended. On the other hand, a receiving piece 14 is formed on the bearing body 10 formed on the back surface of the lid main body 2, and the receiving piece 14 can come into contact with the protruding piece 13. When the protruding piece 13 and the receiving piece 14 are in contact with each other (the state shown in FIG. 1), the hinge 4 is in a substantially vertical posture with respect to the receiving frame 3. Further, a plurality of radially extending ribs 15 are formed on the back surface of the lid body 2 (six ribs in FIG. 1), and any one of these is formed as a guide portion 16. In the example of FIG. 1, the guide portion 16 is provided to be exposed on the lower side opposite to the side on which the hinge 4 is attached to the lid body 2, and is a center line connecting the hinge 4 and the center of the lid body 2. It is formed so as to be symmetric with respect to C (see FIG. 4) (in the example of FIG. 4 symmetric with respect to the center line C at an angle of 30 °). Note that the guide portion 16 may be provided separately from the rib 15 without being provided with any of the ribs 15. Furthermore, the guide portion 16 is not limited to a radial shape, and may be provided at any angle as long as it has a predetermined length (for example, a cross beam shape).

  The opening / closing operation of the underground structure lid 1 having the above structure will be described below with reference to FIGS.

  FIG. 6 shows a state in which the lid body 2 is opened. In this state, the retaining piece 5 of the hinge 4 is locked to the hinge seat 8, and the shaft portion 9 of the hinge 4 extends in the center direction of the receiving frame 3. In addition, let the state of the hinge 4 in FIG. 6 be an open position. At this time, the guide portion 16 of the lid body 2 is in contact with the upper surface 3a of the receiving frame on the opposite side where the hinge seat 8 of the receiving frame 3 is formed on the lower surface thereof. That is, the lid body 2 is placed on the upper surface 3 a of the receiving frame 3. Since the lower surface of the guide portion 16 is formed substantially parallel to the upper surface of the lid body 2, the upper surface of the lid body 2 is substantially parallel to the upper surface of the receiving frame 3 in this state. The guide portion 16 has a protrusion 17 that protrudes downward. The protrusion 17 serves as a locking portion that restricts the movement of the lid body 2. Specifically, since the upper surface 3 a of the receiving frame and the protrusion 17 are locked, the lid body 2 is not moved in the parallel direction (arrow D direction) with respect to the receiving frame 3. That is, as described later, when the lid main body 2 is housed in the receiving frame 3, the guide portion 16 is moved along the upper surface 3a of the receiving frame, but this movement can be prevented from being inadvertently generated. For example, when the receiving frame 3 is installed on an inclined road surface, the lid body 2 can be prevented from sliding down into the receiving frame 3 due to its own weight. A groove having a size capable of receiving the upper surface 3a of the receiving frame instead of the protrusion 17 may be formed as a locking portion, or the locking portion may be formed on the upper surface 3a of the receiving frame.

  When the operator places the lid body 2 in the receiving frame 3, the operator pushes the lid body 2 in the direction of arrow D (the side on which the hinge 4 is attached). As a result, as shown in FIG. 7, the lower surface of the guide portion 16 and the upper surface 3 a of the receiving frame slide, and the lid body 2 moves in a direction substantially parallel to the receiving frame 3. At the same time, the hinge 4 and the receiving portion 8b of the hinge seat 8 are in sliding contact, and the hinge 4 moves obliquely downward. During this movement, the lid body 2 moves slightly diagonally downward. At this time, even if the lid main body 2 is slightly displaced from side to side when viewed in plan with respect to the receiving frame 3, the guide portions 16 formed radially as described above guide the lid main body 2 to a predetermined position. Can do. That is, when the hinge 4 is in the open position, even when the center line C of the lid body 2 and the center line of the receiving frame corresponding to the center line C do not coincide with each other when viewed in plan view, When 2 moves along the receiving frame 3, it is guided by the guide portion 16 in a direction in which both centerlines coincide. For this reason, the lid body 2 can be accommodated in the receiving frame 3 at an appropriate position.

  Then, the receiving portion 8 b of the hinge seat 8 enters the recess 11 of the hinge 4. And as shown in FIG. 8, the hinge 4 rotates to the arrow E direction centering | focusing on the receiving part 8b. This turning operation is caused by the sliding contact between the curved surface of the recess 11 and the upper surface of the receiving portion 8b facing the hinge insertion hole 8a. In other words, the receiving portion 8b of the hinge seat 8 has a portion of the upper surface on the side facing the hinge insertion hole 8a having a portion with substantially the same curvature following the curved surface of the recessed portion 11, so that the receiving portion 8b is recessed. 11, the recess 11 slides along the upper surface of the receiving portion 8 b facing the hinge insertion hole 8 a, and the hinge 4 rotates around the receiving portion 8 b. Become. During this rotation operation, the lid body 2 moves in the lateral direction (in the direction of arrow D) as it is. Thereby, the lid body 2 can be prevented from entering obliquely downward with respect to the receiving frame 3. As described above, the lid main body 2 moves in parallel with the receiving frame 3 via the guide portion 16 along the upper surface 3a of the receiving frame 3, so that the lid main body is surely coupled with the rotation operation of the hinge 4. 2 can be moved parallel to the receiving frame 3.

  And if the hinge 4 rotates to some extent, the protrusion piece 13 of the hinge 4 mentioned above will contact | abut the receiving piece 14 of the bearing body 10. FIG. In this state, the rotation of the hinge 4 in the direction of arrow E is restricted, and the hinge 4 assumes the above-described substantially vertical posture. In this substantially vertical posture, the tangent line Q to the curved surface at the upper end edge 11a of the recess 11 extends parallel to the receiving frame 3 or obliquely upward toward the center direction of the receiving frame (in FIG. 8, slightly obliquely upward). Extended). Accordingly, the rotation of the hinge 4 in this state is restricted, but the concave portion 11 can be separated in the lateral direction (arrow D direction) with respect to the receiving portion 8b. For this reason, as shown in FIG. 9, since the lid body 2 is pushed in the direction of the arrow D, the concave portion 11 is separated from the receiving portion 8b, and the hinge 4 is moved in the lateral direction (arrow D direction). Even at this time, the lid body 2 moves while maintaining a substantially parallel state with respect to the receiving frame 3.

  Then, as shown in FIG. 10, the lid body 2 starts to fall. At this time, since the lid main body 2 has moved to some extent in the lateral direction, the lid main body 2 is disposed almost directly above the receiving frame 3. Since the lid body 2 remains substantially parallel to the receiving frame 3, the lid body 2 falls toward the receiving frame 3 as it is. Therefore, when the lid main body 2 is closed, it is possible to prevent a step from being generated between the lid main body 2 and the receiving frame 3, and the lid main body 2 can be reliably stored in a substantially parallel state with respect to the receiving frame 3. Since the lid body 2 is pushed into the receiving frame while being lifted slightly by the opening / closing bar, the lid body 2 falls in a slightly inclined state as shown in FIG. 10, but the substantially parallel state referred to in the present invention is as described above. A state in which the lid body 2 is slightly tilted is also included.

  Then, as shown in FIG. 11, the projecting portion 18 formed on the head portion 6 of the hinge 4 contacts the receiving portion 8 b of the hinge seat 8. Specifically, the protruding portion 18 is provided to protrude toward the receiving portion 8 b side of the head portion 6, and this protruding portion 18 comes into contact with the upper surface of the receiving portion 8 b when the hinge 4 is dropped. The protruding portion 18 also has a curved surface similar to the concave portion 11. Therefore, thereafter, the curved surface of the protruding portion 18 comes into sliding contact with the receiving portion 8b. As a result, the lid body 2 is finally guided to fit in the receiving frame 3 at an accurate position.

  Then, as shown in FIG. 12, the protruding portion 18 moves along the receiving portion 8 b and the lid body 2 is accommodated in the receiving frame 3. The position of the hinge 4 at this time is the closed position. Therefore, when the lid body 2 moves from the open state to the state within the receiving frame 3, the hinge 4 moves from the open position to the closed position.

  Thus, when the lid body 2 is housed in the receiving frame 3 and closed, that is, when the hinge 4 is moved from the open position to the closed position, the receiving portion 8b of the hinge seat 8 enters the recess 11 and the hinge 4 is received. Since it rotates around the mounting portion 8b, the upper surface of the lid body 2 can be moved in the lateral direction while being substantially parallel to the upper surface of the receiving frame 3. And since the lid body 2 can be dropped from almost right above the receiving frame 3 by leaving the recess 11 away from the receiving portion 8b as it is, when the lid body 2 is closed, A step is prevented from occurring with the receiving frame 3, and the lid main body 2 can be reliably stored in a substantially parallel state with respect to the receiving frame 3.

When opening the lid body 2, the procedure is the reverse of the above, but when the lid body 2 is first pulled up, the operator uses a tool such as an opening / closing bar. The opening / closing bar is pulled up by inserting the opening / closing bar into a bar hole 19 provided at one location on the outer periphery of the lid body 2. Further, an auxiliary bar hole 23 is provided symmetrically with respect to the center line C at a position of an angle of 60 ° across the center line C (see FIG. 4). As shown in FIG. 13, projecting portions 20 projecting outward are formed below the auxiliary bar holes 23, respectively. The presence of such a protrusion 20 can prevent the lid body 2 from sliding up from the receiving frame 3. It is most effective to provide the protrusion 20 symmetrically with respect to the center line C at a position of an angle of 60 ° across the center line C. As shown in FIG. 14, the lower peripheral edge 21 of the lid main body 2 other than the protrusions 20 formed extends below the lower surface 22 of the receiving frame body 3 b of the receiving frame 3. This also prevents the lid body 2 from sliding up from the receiving frame 3.

  On the other hand, the lower surface of the guide portion 16 of the lid body 2 described above may be inclined. Specifically, the lower surface of the guide portion 16 is inclined toward the upper surface of the lid body from the center line C of the lid body 2 toward the outside. In this way, when the lid body 2 is in a position slightly shifted from side to side when viewed in plan with respect to the receiving frame 3, that is, when the hinge 4 is in the open position, the lid body 2 is viewed in plan view. Even if the center line C and the center line of the receiving frame corresponding to the center line C do not coincide with each other, both center lines are formed by the guide portion 16 when the lid body 2 moves along the upper surface 3a of the receiving frame. Guided in the matching direction. For this reason, the lid body 2 can be accommodated in the receiving frame 3 at an appropriate position. In order to further enhance this effect, the inclination angle of the lower surface of the guide portion 16 may be gradually increased toward the center of the lid body 2.

DESCRIPTION OF SYMBOLS 1 Lid for underground structures 2 Lid main body 3 Receiving frame 3a Upper surface 3b of receiving frame Main body 4 Hinge 5 Retaining piece 6 Head part 7 Rotating shaft 8 Hinge seat 8a Hinge insertion hole 8b Receiving part 9 Shaft part 10 Bearing body 11 Recessed part 13 Protruding piece 14 Receiving piece 15 Rib 16 Guide portion 17 Protrusion (locking portion)
18 Protruding portion 19 Bar hole 20 Protruding portion 21 Lower peripheral edge portion 22 of lid body Lower surface 23 of frame body Auxiliary bar hole

Claims (6)

Receiving slots,
A hinge seat protruding inside the receiving frame, having a receiving portion at the tip, and having a hinge insertion hole in the center;
A hinge having a shaft portion inserted through the hinge insertion hole of the hinge seat, a retaining piece formed at the lower end, and a head portion formed at the upper end;
In the lid for an underground structure provided with a lid body that can be opened and closed with respect to the receiving frame via the hinge that is swingably attached to the lower side,
The shaft portion of the hinge has a recess including a curved surface that is curved in a longitudinal section,
The receiving portion of the hinge seat is formed so that at least a part of the upper surface facing the hinge insertion hole follows the curved surface ,
The head portion of the hinge is formed with a protrusion that can contact the receiving portion of the hinge seat, and the protrusion has a curved surface similar to the curved surface of the recess . lid. The hinge is movable between a closed position in which the lid body is housed in the receiving frame and an open position in which the retaining piece is in contact with the hinge seat and extends inward of the receiving frame. And
When the lid body is pushed to the hinge side, the shaft portion of the hinge descends while sliding along the receiving portion of the hinge seat,
The receiving portion enters the recess, the hinge rotates around the receiving portion as a rotation axis, and the upper surface of the lid body moves while maintaining a substantially parallel state with respect to the upper surface of the receiving frame,
When the concave portion is separated from the receiving portion and the upper surface of the lid body is dropped in a substantially parallel state with respect to the upper surface of the receiving frame ,
The protruding portion formed on the head portion of the hinge contacts the upper surface of the receiving portion, and the curved surface of the protruding portion is in sliding contact with the curved surface formed on a part of the upper surface of the receiving portion. The hinge for an underground structure according to claim 1, wherein the hinge is in a closed position. The head portion of the hinge has a protruding piece extending to at least one of the left and right,
A receiving piece that can come into contact with the protruding piece is formed on the lower side of the lid body,
The lid for an underground structure according to claim 1 or 2, wherein the hinge is in a substantially vertical posture with respect to the upper surface of the receiving frame in a state where the protruding piece and the receiving piece are in contact with each other. The lid body has a guide portion that comes into contact with the upper surface of the receiving frame when the lid body is housed in the receiving frame;
The underground structure lid according to any one of claims 1 to 3, wherein the guide portion has a lower surface substantially parallel to an upper surface of the lid body.   The lid for an underground structure according to claim 4, wherein a locking portion for restricting movement of the guide portion is provided on a lower surface of the guide portion or an upper surface of the receiving frame.   The guide part is provided to be exposed on the lower side of the lid body opposite to the side on which the hinge is attached to the lid body, and extends radially from the center of the lid body, and the hinge and the lid The lid for an underground structure according to claim 4 or 5, wherein the lid for an underground structure is formed so as to be symmetric with respect to a center line connecting the center of the main body.

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