JP2023114868A - Lid for underground structure - Google Patents

Abstract

To provide a lid for underground structure which suppresses rattling of a lid body which is generated due to a repeated load accompanying the travel of a vehicle and the like.SOLUTION: A lid body 5 of a lid 1 for underground structure includes a protrusion part 30 which protrudes from a lid body part 10 toward a first direction D11 of a first direction D1 which is in parallel with respect to a central axis C1 of an opening part 3 of a frame body 4. The protrusion part 30 includes a deformable part 60 which can elastically deform. The deformable part 60 includes: a first portion 80 which tapers toward the first direction D11; a second portion 90 which continues to the side of the first direction D11 with respect to the first portion 80, and in which the minimum thickness is the minimum thickness of the first portion 80; and a third portion 100 which continues to the side of the first direction D11 with respect to the second portion 90, and which tapers toward the first direction D11. The first portion 80 is in non-contact with respect to the frame body 4, and the second and third portions 90, 100 contain first and second contact parts 92, 102 coming into contact with respect to the frame body 4 respectively.SELECTED DRAWING: Figure 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground structure cover provided with a cover body that is openably and closably supported by a frame that forms an opening that connects a road surface and an underground structure.

Patent Document 1 discloses a hinge provided on a lid body in order to provide a receiving frame for an underground structure lid that can secure a wide opening space in the receiving frame and prevent rattling between the receiving frame and the lid body. A receiving frame for an underground structure lid configured to be able to open and close an opening with a tool, which is formed in a substantially rectangular shape having two short sides and two long sides, the short sides having a planar shape. is formed in a curved shape, and the cross-sectional area of the long side gradually increases from near the boundary of the short side toward the center of the long side.

Japanese Patent Application Laid-Open No. 7-97817 (Abstract)

In the case of lids for underground structures, it is required to suppress rattling of the lid bodies caused by repeated loads accompanying running of vehicles and the like.

One aspect of the present invention is an underground structure lid that includes a lid that is openably and closably supported by a frame that forms an opening that connects a road surface and an underground structure. The lid includes a lid body capable of closing the opening, a load transmission part transmitting the load of the lid body to the frame, and a road surface in a first direction parallel to the central axis of the opening. a projection projecting from a first location of the lid body in a first direction from the side toward the side of the subterranean structure. The protrusion includes a deformable portion that is elastically deformable to damp vibration of the lid relative to the frame. The deformable portion includes a first portion that tapers from a first thickness to a second thickness toward the first direction, and a first portion that is continuous with the first portion in the first direction and has a minimum thickness of the first portion. a second portion having a thickness of 2 and a third portion contiguous with the second portion on the side facing the first direction and tapering from the second thickness to the third thickness in the first direction; including. The first part is non-contact with the frame. The second portion includes a first contact portion that contacts the frame. The third portion includes a second contact portion that contacts the frame.

In this lid for the underground structure, the projecting portion projecting from the lid main body in a first direction (typically downward) from the road surface side to the underground structure side is attached to the frame. including a deformable portion that is elastically deformable to dampen vibrations of the The deformable portion includes first, second and third portions in sequence toward the first orientation, with a minimum thickness between the first and third portions tapering together toward the first orientation. is the minimum thickness (second thickness) of the first portion. That is, the first and third portions, which are both tapered, continue through the second portion, which ensures a thickness equal to or greater than the minimum thickness of the first portion. Therefore, the rate of decrease in the thickness of the deformable portion can be made lower than the rate of increase in the distance in the first direction from the position (first position) of the lid main body serving as the starting point of the projecting portion. . Therefore, it is easy to increase the distance in the first direction while ensuring the thickness of the deformable portion. Further, in the lid body of this underground structure lid, the contact portions (first contact portions) of the second and third portions are farther from the starting point (first position) of the projecting portion than the first portion. and the second contact portion) are brought into contact with the frame, the deformable portion can be elastically deformed. Therefore, when elastically deforming the deformable portion, the external force acting on the first and second contact portions (the reaction force from the frame body) can be easily reduced, and as a result, deterioration of the deformable portion can be easily suppressed. . Therefore, it is possible to provide an underground structure lid that can easily suppress over a long period of time the rattling of the lid that occurs due to repeated loads that accompany the running of a vehicle or the like.

The first portion includes a first inclined surface that slopes toward the central axis as it goes in the first direction, and the second portion includes a first straight surface that extends along the first direction. , the third portion includes a second inclined surface inclined to approach the central axis in the first direction, the first straight surface includes the first contact portion, and the second inclined surface preferably includes a second contact portion.

In the cover body of this underground structure cover, the first and third portions that both taper in the first direction are inclined surfaces that are inclined so as to approach the central axis in the first direction. (the first inclined surface and the second inclined surface), it is possible to suppress the deformable portion of the lid from interfering with the frame when the lid is opened and closed with respect to the frame. can. Therefore, it is easy to reduce the probability that an external force acts on the deformable portion except when the deformable portion is elastically deformed. Furthermore, since the first and second inclined surfaces are connected via the first straight surface extending along the first direction, when elastically deforming the deformable portion, the first portion is attached to the frame body. The first contact portion of the second portion is easily brought into contact with the frame without contacting with the frame. For this reason, the reaction force from the frame that acts when elastically deforming the deformable portion can be applied not only to the third portion that tapers below the minimum thickness (second thickness) of the first portion, but also to the first portion. It can be made to bear in cooperation with the 2nd part which ensured thickness more than the minimum thickness (2nd thickness) of a part. Therefore, it is easier to suppress deterioration of the deformable portion.

It is preferable that the first contact portion includes a bent portion connecting the first straight surface and the second inclined surface, and the second contact portion includes the bent portion. Since the bent portions of the first straight surface and the second inclined surface having different inclination angles with respect to the first direction can be brought into contact with the frame, when the deformable portion is elastically deformed, the first and The reaction force from the frame is likely to act continuously on both of the second contact portions.

The inclination angle of the second inclined surface with respect to the first orientation is preferably smaller than the inclination angle of the first inclined surface with respect to the first orientation. Deformation in the first direction is possible by making the inclination angle of the second inclined surface arranged on the side of the first inclined surface in the first direction smaller than the inclination angle of the first inclined surface. The reduction rate of the thickness of the portion can be further reduced.

This underground structure lid further includes a frame that supports the lid so that it can be opened and closed, the frame includes a deformation-inducing portion capable of inducing elastic deformation with respect to the deformable portion, and the deformation-inducing portion comprises: , a non-contact surface that is not in contact with the deformable portion, and a contact surface that is continuous with the non-contact surface on the side facing the first direction and is in contact with the deformable portion. The first portion, which is closer to the starting point (first position) of the protrusion than the second and third portions, is not brought into contact with the frame, and the contact portion (first position) of the second and third portions is and the second contact portion) can be brought into contact with the frame with high reliability.

The inclination angle of the contact surface with respect to the first orientation is preferably smaller than the inclination angle of the non-contact surface with respect to the first orientation. By making the inclination angle of the non-contact surface larger than the inclination angle of the contact surface, it is possible to further reduce the probability that the first portion and the frame will come into contact with each other.

The lid body includes a connecting portion that connects the load transmitting portion and the projecting portion, the load transmitting portion includes a second straight surface extending in a second direction perpendicular to the first direction, and the connecting portion includes the second straight surface. Preferably, the recess includes a recess recessed toward the opposite side in the first direction with respect to the straight surface of the recess, the recess including a bottom surface formed at the first position. Since the bottom surface of the recess recessed with respect to the second straight surface is formed at the first position of the lid main body, which is the starting point of the protrusion, the protrusion can be projected from the bottom surface of the recess. Therefore, the external force acting on the first and second contact portions (the reaction force from the frame) can be reduced without increasing the size of the lid itself in the first direction. Therefore, it is possible to provide an underground structure lid capable of suppressing deterioration of the deformable portion with a compact lid body.

FIG. 1 is a cross-sectional view of an underground structure lid according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of the underground structure lid shown in FIG. FIG. 3 is a cross-sectional view of a main part of the underground structure cover in a state where the cover is closed with respect to the frame.

FIG. 1 is a cross-sectional view of an underground structure lid 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the underground structure cover 1. FIG. The underground structure lid 1 includes a frame 4 forming an opening 3 connecting the road surface RS and the underground structure 2, a lid 5 supported by the frame 4 so as to be opened and closed, and A guide mechanism 6 for guiding the movement of the lid 5 so that the lid 5 moves along a predetermined movement trajectory when the lid 5 is opened and closed, and a closing mechanism in which the lid 5 is closed with respect to the frame 4. A seal member 7 is provided between the frame 4 and the lid 5 in a state (hereinafter simply referred to as a "closed state"). An example of the underground structure cover 1 is a manhole cover, a large iron cover, a sewage pit cover, an underground facility equipment in electrical equipment or communication equipment, which closes an opening connecting underground buried objects or underground structural facilities in a sewage system with the ground. Also functions as an opening/closing door that connects an openable utility trench cover to protect underground cables, an iron cover for power transmission, an iron cover for power distribution, an underground conduit for water supply or gas pipes, and its accessory equipment to the ground. Fire hydrant lids, water control valve lids, gate valve lids, air valve lids, gas pipe lids, water meter lids, etc.

The frame 4 has an inner peripheral surface 4a that defines the opening 3 and has a substantially cylindrical shape. Since the opening 3 is formed by the inner peripheral surface 4a of the frame 4, it has a substantially circular shape. A central axis C1 of the opening 3 in this example extends along the vertical direction VD. The central axis C1 of the opening 3 is a direction intersecting the road surface RS, typically a direction orthogonal to the road surface RS. The lid body 5 includes a lid body portion 10 capable of closing the opening 3, a load transmission portion 20 transmitting the load of the lid body portion 10 to the frame body 4, and a plurality of projecting portions projecting from the lid body portion 10. 30 and a reinforcement portion 40 that reinforces the lid body portion 10 . The lid main body 10 has a substantially disk shape, and includes an upper surface 11 exposed on the road surface RS in the closed state, a lower surface 12 facing the opening 3 in the closed state, and an outer peripheral surface 13 connecting the upper surface 11 and the lower surface 12 together. have The central axis C2 of the lid main body 10 of this example coincides with the central axis C1 of the opening 3 in the closed state. The load transmission portion 20 and the plurality of projecting portions 30 are formed integrally with the lid body portion 10 . The load transmission portion 20 is provided on the outer peripheral portion of the lower surface 12 of the lid body portion 10 , and in this example, is provided continuously over the entire area (entire circumference) of the lid body portion 10 in the circumferential direction CD. Each projecting portion 30 is supported by the lid main body portion 10 in a cantilevered manner. The plurality of projecting portions 30 are arranged along the circumferential direction CD of the lid body portion 10 . The reinforcing portion 40 includes grid-like ribs provided on the lower surface 12 of the lid body portion 10 .

The guide mechanism 6 includes a guide member 45 provided on the frame 4 and a guided member 46 provided on the lid 5 and guided with respect to the guide member 45 . The guide member 45 has a guide hole 45a for guiding the member 46 to be guided. The guided member 46 is fixed to the lid body 5 and has a rod-like moving portion 47 that moves with respect to the guiding member 45 while being inserted into the guide hole 45a. and a retaining portion 48 to prevent.

FIG. 3 is a cross-sectional view of a main part of the underground structure lid 1 in a closed state. Unless otherwise specified, each member will be described on the assumption that it is in a closed state. Each projecting portion 30 extends from a first position P1 provided on the lid main body portion 10 to the road surface RS in a first direction D1 (typically a vertical direction VD) parallel to the central axis C1 of the opening portion 3 . from the side of the underground structure 2 toward the side of the underground structure 2 (typically downward). The projecting portion 30 has an inner side surface 31 positioned inside in the radial direction RD centering on the central axis C1, an outer side surface 32 positioned outside in the radial direction RD, and a tip surface 33 connecting the inner side surface 31 and the outer side surface 32. including.

The inner side surface 31 is a straight surface extending along the first direction D11. Although details will be described later, the outer surface 32 has an end portion in the first direction D11 that extends outward in a second direction D12 (typically, upward) opposite to the first direction D11. It has a portion inclined with respect to the first direction D11 so as to be closer to the inner side surface 31 than the end of the side surface 32, and the inclination angle of the outer side surface 32 with respect to the first direction D11 is the first direction. It is changing on the way to D11. The tip surface 33 is, for example, a curved surface whose central portion in the radial direction RD protrudes in the first direction D11.

The protruding portion 30 includes a base portion 50 connected to the lid body portion 10 at the first position P1, a deformable portion 60 connected to the base portion 50, and a tip portion 70 connected to the deformable portion 60. The deformable portion 60 is elastically deformed by contacting the frame 4 so as to attenuate the vibration of the lid 5 with respect to the lid main body 10 .

The deformable portion 60 includes a first portion 80 that tapers from a first thickness T1 to a second thickness T2 in the first direction D11, and a first portion 80 that faces the first direction D11 with respect to the first portion 80. and a second portion 90 having a second thickness T2 that is substantially constant as it goes in the first direction D11, and a second portion 90 that continues in the first direction D11 with respect to the second portion 90 and extends in the first direction D11. and a third portion 100 tapering from the second thickness T2 to the third thickness T3 in the direction D11. In this example, the first thickness T1>the second thickness T2>the third thickness T3. The maximum thickness of the first portion 80 is the first thickness T1, and the minimum thickness of the first portion 80 is the second thickness T2. The maximum and minimum thicknesses of the second portion 90 are the second thickness T2. The maximum thickness of the third portion 100 is the second thickness T2, and the minimum thickness of the third portion 100 is the third thickness T3. Also, the first portion 80 continues to the root portion 50 and the third portion 100 continues to the tip portion 70 .

The first portion 80 includes a first sloped surface 81 that slopes toward the central axis C1 of the opening 3 in the first direction D11. The second portion 90 includes a first straight surface 91 extending along the first direction D11. The third portion 100 includes a second sloped surface 101 that slopes toward the central axis C1 of the opening 3 in the first direction D11. The first inclined surface 81 , the first straight surface 91 and the second inclined surface 101 form part of the outer surface 32 of the projection 30 . The inclination angle θ2 of the second inclined surface 101 with respect to the first direction D11 is smaller than the inclination angle θ1 of the first inclined surface 81 with respect to the first direction D11.

The first portion 80 is out of contact with the frame 4 . A first straight surface 91 of the second portion 90 includes a first contact portion 92 that contacts the frame 4 . A second inclined surface 101 of the third portion 100 includes a second contact portion 102 that contacts the frame 4 . First contact portion 92 and second contact portion 102 include bent portion 110 connecting first straight surface 91 and second inclined surface 101 .

The deformable portion 60 in the closed state is elastically deformed as the first contact portion 92 and the second contact portion 102 come into contact with the frame 4 . Therefore, strictly speaking, the first straight surface 91 may include a slightly deformed or inclined portion, but even in that case, the first straight surface 91 may be substantially parallel to the central axis C1 of the opening 3. extends to Therefore, the inclination angle of the first straight surface 91 with respect to the first direction D11 is much smaller than the inclination angle θ2 of the second inclined surface 101 . In a state in which the lid 5 is opened with respect to the frame 4, that is, in a state before the first contact portion 92 and the second contact portion 102 contact the frame 4, the central axis of the opening 3 When C1 and the central axis C2 of the lid body portion 10 are aligned, the first straight surface 91 extends in a first direction D11 parallel to the central axis C1 of the opening 3 .

In this example, the first contact portion 92 is only the bent portion 110, and the second contact portion 102 is located on the first direction D11 side of the bent portion 110 and the second inclined surface 101 relative to the bent portion 110. including, but not limited to, portions of For example, the first contact portion 92 includes a bent portion 110 and a portion of the first straight surface 91 on the second direction D12 side of the bent portion 110, and the second contact portion 102 includes only the bent portion 110. may be Alternatively, the first contact portion 92 includes the bent portion 110 and a portion of the first straight surface 91 on the second direction D12 side of the bent portion 110, and the second contact portion 102 includes the bent portion 110 and a portion on the first direction D11 side of the bent portion 110 of the second inclined surface 101 may be included.

The load transmission portion 20 includes a second straight surface 21 extending in a second direction D2 (typically horizontal direction) perpendicular to the first direction D1. The second straight surface 21 has, for example, an annular shape centered on the central axis C2 of the lid body portion 10 . The lid 5 further includes a connection portion 120 that connects the load transmission portion 20 and the plurality of projecting portions 30 . The connection portion 120 includes a recess 121 recessed in the second direction D12 with respect to the second straight surface 21 . The concave portion 121 has an annular shape centered on the central axis C2 of the lid main body portion 10 . Recess 121 includes a bottom surface 122 formed at first position P1 and a pair of wall surfaces (first wall surface 123 and second wall surface 124) rising from bottom surface 122 in first direction D11. The first wall surface 123 connects to the second straight surface 21 , and the second wall surface 124 connects to the outer surface 32 of the projecting portion 30 .

The frame 4 includes a deformation inducing portion 130 capable of inducing elastic deformation in the deformable portion 60 of the projecting portion 30, a load supporting portion 140 supporting the load transmitted from the load transmitting portion 20, and a lid body portion. 10, and a main housing portion 150 for housing 10. The deformation-inducing portion 130 includes a non-contact surface 131 that is not in contact with the protruding portion 30, and a contact surface that is continuous with the non-contact surface 131 in the first direction D11 and contacts the deformable portion 60. 132. The inclination angle θ4 of the contact surface 132 with respect to the first direction D11 is smaller than the inclination angle θ3 of the non-contact surface 131 with respect to the first direction D11. The contact surface 132 contacts the first contact portion 92 of the second portion 90 of the deformable portion 60 and the second contact portion 102 of the third portion 100 of the deformable portion 60 . The load support portion 140 includes a load support surface 141 extending in the second direction D2 and in contact with the second straight surface 21 of the load transmission portion 20 . The load bearing surface 141 has an annular shape centered on the central axis C<b>1 of the opening 3 . The load bearing surface 141 continues to the non-contact surface 131 of the deformation-inducing portion 130 . The body housing portion 150 includes a facing surface 151 that faces the outer peripheral surface 13 of the lid body portion 10 . The contact surface 132 , the non-contact surface 131 , the load bearing surface 141 and the facing surface 151 form part of the inner peripheral surface 4 a of the frame 4 .

In this example, the inclination angle θ1 of the first inclined surface 81 is smaller than the inclination angle θ3 of the non-contact surface 131, and the inclination angle θ2 of the second inclined surface 101 is at least larger than the inclination angle θ4 of the contact surface 132. Designed to be small. The inclination angle θ2 of the second inclined surface 101 and the inclination angle θ4 of the contact surface 132 may be the same.

The sealing material 7 is, for example, an elastic member such as an O-ring. The sealing material 7 includes a first sealing portion 152 accommodated in the recess 121 and a second sealing portion 153 protruding from the recess 121 . The second seal portion 153 is located in the space 133 between the root portions 50 of the plurality of protrusions 30 and the non-contact surface 131 of the deformation-inducing portion 130 . The sealing material 7 contacts the non-contact surface 131 and the pair of wall surfaces 123 and 124 . As a result, liquids such as rainwater and oil flowing from the road surface RS can be prevented from entering the underground structure 2 side of the load transmission section 20 through the gap between the frame 4 and the lid 5 .

According to this underground structure lid 1, the deformable portion 60 of the protruding portion 30 protruding from the lid main body portion 10 includes the first portion 80, the second portion 90, and the deformable portion 60 in the first direction D11. , including the third portion 100 and tapering together in the first direction D11, the minimum thickness is the minimum thickness of the first portion 80 (the second A second portion having a thickness T2) is arranged. That is, the first portion 80 and the third portion 100, which are both tapered, are connected via the second portion 90 which ensures a thickness equal to or greater than the minimum thickness of the first portion 80. As shown in FIG. For this reason, compared to the rate of increase in the distance from the position (first position P1) of the lid main body 10, which is the starting point of the projecting portion 30, in the first direction D11, the rate of decrease in the thickness of the deformable portion 60 is can be lowered. Therefore, it is possible to increase the distance in the first direction D11 while ensuring the thickness of the deformable portion 60 . Furthermore, in the lid body 5 of the lid 1 for underground structure, the second portion 90 and the third portion 100 are located farther from the starting point (first position P1) of the projecting portion 30 than the first portion 80. By bringing the contact portions (the first contact portion 92 and the second contact portion 102) into contact with the frame 4, the deformable portion 60 can be elastically deformed. Therefore, when the deformable portion 60 is elastically deformed, the external force acting on the first contact portion 92 and the second contact portion 102 (the reaction force from the contact surface 132 of the frame 4) can be reduced. , as a result, deterioration of the deformable portion 60 can also be suppressed. Therefore, it is possible to provide the underground structure lid 1 capable of suppressing rattling of the lid body 5 caused by repeated loads caused by running of a vehicle or the like for a long period of time.

Furthermore, in the lid body 5 of the lid 1 for underground structure, the first portion 80 and the third portion 100, which both taper in the first direction D11, respectively taper in the first direction D11. Since the inclined surfaces (the first inclined surface 81 and the second inclined surface 101) that are inclined so as to approach the central axis C1 are included, the lid 5 is deformed when the lid 5 is opened and closed with respect to the frame 4. It is possible to suppress the possible portion 60 from interfering with the frame 4 . Therefore, it is possible to reduce the probability that an external force acts on the deformable portion 60 except when the deformable portion 60 is elastically deformed. Furthermore, since the first inclined surface 81 and the second inclined surface 101 are connected via the first straight surface 91 extending along the first direction D11, when the deformable portion 60 is elastically deformed, , the first contact portion 92 of the second portion 90 can be brought into contact with the frame 4 while the first portion 80 is not brought into contact with the frame 4 . Therefore, the reaction force from the contact surface 132 of the frame 4 that acts when the deformable portion 60 is elastically deformed is reduced to the minimum thickness (second thickness T2) or less of the first portion 80 by the third thickness. Not only the portion 100 but also the second portion 90 where the minimum thickness (second thickness T2) of the first portion 80 is ensured can be borne. Therefore, deterioration of the deformable portion 60 can be further suppressed.

According to this underground structure cover 1, the first contact portion 92 includes the bent portion 110 connecting the first straight surface 91 and the second inclined surface 101, and the second contact portion 102 Includes flexure 110 . Therefore, the bent portion 110 connecting the first straight surface 91 and the second inclined surface 101 having different inclination angles θ1 and θ2 with respect to the first direction D11 can be brought into contact with the frame 4 . Therefore, when the deformable portion 60 is elastically deformed, the reaction force from the contact surface 132 of the frame 4 can be continuously applied to both the first contact portion 92 and the second contact portion 102 . .

Furthermore, according to this underground structure cover 1, the inclination angle is smaller than the inclination angle θ1 of Therefore, the reduction rate of the thickness of the deformable portion 60 in the first direction D11 can be further reduced.

Furthermore, according to this underground structure lid 1, the frame 4 includes the deformation-inducing portion 130 capable of inducing elastic deformation with respect to the deformable portion 60, and the deformation-inducing portion 130 and a contact surface 132 that is continuous with the non-contact surface 131 in the first direction D11 and contacts the deformable portion 60 . Therefore, the first portion 80 closer than the second portion 90 and the third portion 100 to the starting point (first position P1) of the protruding portion 30 is not brought into contact with the frame 4, and the second The contact portions (the first contact portion 92 and the second contact portion 102 ) of the portion 90 and the third portion 100 can be reliably brought into contact with the contact surface 132 of the frame 4 . Furthermore, since the inclination angle θ2 of the second inclined surface 101 is designed to be equal to or smaller than the inclination angle θ4 of the contact surface 132, the second contact portion 102 and the contact surface 132 It is easy to increase the contact area (enlarge the contact area). Therefore, it is easy to disperse the external force acting on the second contact portion 102 (the reaction force from the contact surface 132 of the frame 4), and it is easy to suppress deterioration of the deformable portion 60 as well.

Furthermore, according to this underground structure lid 1, the inclination angle θ3 of the non-contact surface 131 is larger than the inclination angle θ4 of the contact surface 132. As shown in FIG. Therefore, the probability of contact between the first portion 80 and the non-contact surface 131 of the frame 4 can be further reduced. Furthermore, since the inclination angle θ1 of the first inclined surface 81 is designed to be smaller than the inclination angle θ3 of the non-contact surface 131 , the first portion 80 and the non-contact surface 131 of the frame 4 are in contact with each other. Contact can be reliably prevented.

Furthermore, according to this underground structure lid 1, the bottom surface 122 of the recess 121 recessed with respect to the second straight surface 21 is formed at the first position P1 of the lid main body 10, which is the starting point of the projecting portion 30. Therefore, the protrusion 30 can protrude from the bottom surface 122 of the recess 121 . Therefore, the external force acting on the first contact portion 92 and the second contact portion 102 (reaction from the contact surface 132 of the frame 4) can be reduced without increasing the size of the lid 5 itself in the first direction D1. force) can be reduced. Therefore, it is possible to provide the underground structure lid 1 that can suppress deterioration of the deformable portion 60 with the compact lid body 5 .

It should be noted that the present invention is not limited to the above embodiments, but includes those defined in the claims. For example, unlike the embodiments described above, the second portion 90 of the deformable portion 60 may have a minimum thickness of the first portion 80 (the second thickness T2), and the first portion 80 may have a portion thicker than the minimum thickness (second thickness T2). Moreover, it is not always necessary to provide a plurality of projecting portions 30, and a single projecting portion projecting from the lid body portion 10 in the first direction D11 may be provided.

In addition, in the above embodiments, expressions such as "horizontal", "parallel", "vertical", "disc shape", "annular shape", "cylindrical shape", and "flat" were used. not required to be in In other words, each of these expressions allows deviations in manufacturing accuracy, installation accuracy, and the like.

REFERENCE SIGNS LIST 1 underground structure lid 2 underground structure 3 opening 4 frame 5 lid 10 lid body 20 load transmission portion 21 second straight surface 30 protrusion 80 first portion , 81 first inclined surface 90 second portion 91 first straight surface 92 first contact portion 100 third portion 101 second inclined surface 102 second contact portion 110 bending portion 120 connection portion 121 recess 122 bottom surface 130 deformation-inducing portion 131 non-contact surface 132 contact surface C1 central axis D1 first direction D11 first orientation D12 second orientation (second 1) P1 first position, RS road surface, T1 first thickness, T2 second thickness, T3 third thickness, θ1 tilt angle, θ2 tilt angle, θ3 tilt angle, θ4 tilt angle

Claims (7)

An underground structure lid comprising a lid supported so as to be openable and closable by a frame forming an opening connecting a road surface and an underground structure,
The lid body includes a lid body portion capable of closing the opening,
a load transmission portion that transmits the load of the lid body portion to the frame;
A protrusion protruding from a first position of the lid main body in a first direction from the road surface side to the underground structure side in a first direction parallel to the central axis of the opening. and
the projecting portion includes a deformable portion that is elastically deformable so as to damp vibration of the lid with respect to the frame;
The deformable portion has a first portion that tapers from a first thickness to a second thickness toward the first direction;
a second portion continuous with the first portion on the side facing the first direction and having a minimum thickness equal to the second thickness;
a third portion contiguous to the second portion on the side facing the first direction and tapering from the second thickness to the third thickness toward the first direction;
The first portion is non-contact with the frame,
The second portion includes a first contact portion that contacts the frame,
The lid for an underground structure, wherein the third portion includes a second contact portion that contacts the frame. the first portion includes a first inclined surface that inclines so as to approach the central axis as it goes in the first direction;
the second portion includes a first straight surface extending along the first orientation;
the third portion includes a second inclined surface that inclines so as to approach the central axis as it goes in the first direction;
The first straight surface includes the first contact portion,
2. The underground structure lid according to claim 1, wherein said second inclined surface includes said second contact portion. the first contact portion includes a bent portion connecting the first straight surface and the second inclined surface;
3. The underground structure lid according to claim 2, wherein said second contact portion includes said bent portion. 4. The underground structure cover according to claim 2, wherein an inclination angle of said second inclined surface with respect to said first direction is smaller than an inclination angle of said first inclined surface with respect to said first direction. further comprising the frame supporting the lid in an openable and closable manner,
the frame includes a deformation-inducing portion capable of inducing elastic deformation with respect to the deformable portion;
The deformation-inducing part has a non-contact surface that is not in contact with the deformable part,
The lid for an underground structure according to any one of claims 1 to 4, further comprising a contact surface connected to the non-contact surface on the side facing the first direction and in contact with the deformable portion. . 6. The underground structure lid according to claim 5, wherein an inclination angle of said contact surface with respect to said first orientation is smaller than an inclination angle of said non-contact surface with respect to said first orientation. the lid body includes a connection portion that connects the load transmission portion and the projecting portion;
the load transmitting portion includes a second straight surface extending in a second direction orthogonal to the first direction;
the connection portion includes a recess recessed toward the opposite side of the first direction with respect to the second straight surface;
The underground structure lid according to any one of claims 1 to 6, wherein the recess includes a bottom surface formed at the first position.

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